Release eframe 0.21.3 - fix web input of the the letter P

* eframe: Fix inputting of the letter P on web

* Update changelog

* silence clippy

.cargo/config.toml

@@ -0,0 +1,6 @@
+# clipboard api is still unstable, so web-sys requires the below flag to be passed for copy (ctrl + c) to work
+# https://rustwasm.github.io/docs/wasm-bindgen/web-sys/unstable-apis.html
+# check status at https://developer.mozilla.org/en-US/docs/Web/API/Clipboard#browser_compatibility
+# we don't use `[build]` because of rust analyzer's build cache invalidation https://github.com/emilk/eframe_template/issues/93
+[target.wasm32-unknown-unknown]
+rustflags = ["--cfg=web_sys_unstable_apis"]

.github/workflows/rust.yml

@@ -16,66 +16,93 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
+
       - uses: actions-rs/toolchain@v1
         with:
           profile: default
           toolchain: 1.65.0
           override: true
+
       - name: Install packages (Linux)
         if: runner.os == 'Linux'
-        run: sudo apt-get update && sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libspeechd-dev libxkbcommon-dev libssl-dev libgtk-3-dev # libgtk-3-dev is used by rfd
+        #uses: awalsh128/cache-apt-pkgs-action@v1.2.2
+        #TODO(emilk) use upstream when https://github.com/awalsh128/cache-apt-pkgs-action/pull/90 is merged
+        uses: rerun-io/cache-apt-pkgs-action@59534850182063abf1b2c11bb3686722a12a8397
+        with:
+          packages: libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libxkbcommon-dev libssl-dev libgtk-3-dev # libgtk-3-dev is used by rfd
+          version: 1.0
+          execute_install_scripts: true
+
       - name: Set up cargo cache
         uses: Swatinem/rust-cache@v2
+
       - name: Rustfmt
         uses: actions-rs/cargo@v1
         with:
           command: fmt
           args: --all -- --check
+
       - name: Install cargo-cranky
         uses: baptiste0928/cargo-install@v1
         with:
           crate: cargo-cranky
-      - name: Check all features
+
+      - name: check --all-features
         uses: actions-rs/cargo@v1
         with:
           command: check
-          args: --locked --all-features
-      - name: Check default features
+          args: --locked --all-features --all-targets
+
+      - name: check default features
         uses: actions-rs/cargo@v1
         with:
           command: check
-          args: --locked
-      - name: Check no default features
+          args: --locked --all-targets
+
+      - name: check --no-default-features
         uses: actions-rs/cargo@v1
         with:
           command: check
-          args: --locked --no-default-features --lib
+          args: --locked --no-default-features --lib --all-targets
+
+      - name: check eframe --no-default-features
+        uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --locked --no-default-features --lib --all-targets -p eframe
+
       - name: Test doc-tests
         uses: actions-rs/cargo@v1
         with:
           command: test
           args: --doc --all-features
+
       - name: cargo doc --lib
         uses: actions-rs/cargo@v1
         with:
           command: doc
           args: --lib --no-deps --all-features
+
       - name: cargo doc --document-private-items
         uses: actions-rs/cargo@v1
         with:
           command: doc
           args: --document-private-items --no-deps --all-features
+
       - name: Test
         uses: actions-rs/cargo@v1
         with:
           command: test
           args: --all-features
+
       - name: Cranky
         uses: actions-rs/cargo@v1
         with:
           command: cranky
           args: --all-targets --all-features -- -D warnings
 
+  # ---------------------------------------------------------------------------
+
   check_wasm:
     name: Check wasm32 + wasm-bindgen
     runs-on: ubuntu-22.04
@@ -119,7 +146,7 @@ jobs:
       - name: wasm-bindgen
         uses: jetli/wasm-bindgen-action@v0.1.0
         with:
-          version: "0.2.83"
+          version: "0.2.84"
 
       - run: ./sh/wasm_bindgen_check.sh --skip-setup
 
@@ -129,6 +156,8 @@ jobs:
           command: cranky
           args: --target wasm32-unknown-unknown --all-features -p egui_demo_app --lib -- -D warnings
 
+  # ---------------------------------------------------------------------------
+
   cargo-deny:
     name: cargo deny
     runs-on: ubuntu-22.04
@@ -138,18 +167,45 @@ jobs:
         with:
           rust-version: "1.65.0"
 
+  # ---------------------------------------------------------------------------
+
   android:
     name: android
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
+
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
           toolchain: 1.65.0
           target: aarch64-linux-android
           override: true
+
       - name: Set up cargo cache
         uses: Swatinem/rust-cache@v2
+
       - run: cargo check --features wgpu --target aarch64-linux-android
         working-directory: crates/eframe
+
+  # ---------------------------------------------------------------------------
+
+  windows:
+    name: Check Windows
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: 1.65.0
+          override: true
+
+      - name: Set up cargo cache
+        uses: Swatinem/rust-cache@v2
+
+      - name: Check
+        uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --all-targets --all-features

.gitignore

@@ -1,6 +1,7 @@
+.DS_Store
 **/target
 **/target_ra
+**/target_wasm
 /.*.json
 /.vscode
 /media/*
-.DS_Store

CHANGELOG.md

@@ -5,21 +5,48 @@ NOTE: [`epaint`](crates/epaint/CHANGELOG.md), [`eframe`](crates/eframe/CHANGELOG
 
 
 ## Unreleased
+
+
+## 0.21.0 - 2023-02-08 - Deadlock fix and style customizability
+* ⚠️ BREAKING: `egui::Context` now use closures for locking ([#2625](https://github.com/emilk/egui/pull/2625)):
+  * `ctx.input().key_pressed(Key::A)` -> `ctx.input(|i| i.key_pressed(Key::A))`
+  * `ui.memory().toggle_popup(popup_id)` -> `ui.memory_mut(|mem| mem.toggle_popup(popup_id))`
+
 ### Added ⭐
+* Add `Response::drag_started_by` and `Response::drag_released_by` for convenience, similar to `dragged` and `dragged_by` ([#2507](https://github.com/emilk/egui/pull/2507)).
+* Add `PointerState::*_pressed` to check if the given button was pressed in this frame ([#2507](https://github.com/emilk/egui/pull/2507)).
 * `Event::Key` now has a `repeat` field that is set to `true` if the event was the result of a key-repeat ([#2435](https://github.com/emilk/egui/pull/2435)).
 * Add `Slider::drag_value_speed`, which lets you ask for finer precision when dragging the slider value rather than the actual slider.
 * Add `Memory::any_popup_open`, which returns true if any popup is currently open ([#2464](https://github.com/emilk/egui/pull/2464)).
 * Add `Plot::clamp_grid` to only show grid where there is data ([#2480](https://github.com/emilk/egui/pull/2480)).
 * Add `ScrollArea::drag_to_scroll` if you want to turn off that feature.
 * Add `Response::on_hover_and_drag_cursor`.
+* Add `Window::default_open` ([#2539](https://github.com/emilk/egui/pull/2539)).
+* Add `ProgressBar::fill` if you want to set the fill color manually. ([#2618](https://github.com/emilk/egui/pull/2618)).
+* Add `Button::rounding` to enable round buttons ([#2616](https://github.com/emilk/egui/pull/2616)).
+* Add `WidgetVisuals::optional_bg_color` - set it to `Color32::TRANSPARENT` to hide button backgrounds ([#2621](https://github.com/emilk/egui/pull/2621)).
+* Add `Context::screen_rect` and `Context::set_cursor_icon` ([#2625](https://github.com/emilk/egui/pull/2625)).
+* You can turn off the vertical line left of indented regions with `Visuals::indent_has_left_vline` ([#2636](https://github.com/emilk/egui/pull/2636)).
+* Add `Response.highlight` to highlight a widget ([#2632](https://github.com/emilk/egui/pull/2632)).
+* Add `Separator::grow` and `Separator::shrink` ([#2665](https://github.com/emilk/egui/pull/2665)).
+* Add `Slider::trailing_fill` for trailing color behind the circle like a `ProgressBar` ([#2660](https://github.com/emilk/egui/pull/2660)).
 
 ### Changed 🔧
 * Improved plot grid appearance ([#2412](https://github.com/emilk/egui/pull/2412)).
 * Improved the algorithm for picking the number of decimals to show when hovering values in the `Plot`.
+* Default `ComboBox` is now controlled with `Spacing::combo_width` ([#2621](https://github.com/emilk/egui/pull/2621)).
+* `DragValue` and `Slider` now use the proportional font ([#2638](https://github.com/emilk/egui/pull/2638)).
+* `ScrollArea` is less aggressive about clipping its contents ([#2665](https://github.com/emilk/egui/pull/2665)).
+* Updated to be compatible with a major breaking change in AccessKit that drastically reduces memory usage when accessibility is enabled ([#2678](https://github.com/emilk/egui/pull/2678)).
+* Improve `DragValue` behavior ([#2649](https://github.com/emilk/egui/pull/2649), [#2650](https://github.com/emilk/egui/pull/2650), [#2688](https://github.com/emilk/egui/pull/2688), [#2638](https://github.com/emilk/egui/pull/2638)).
 
 ### Fixed 🐛
+* Trigger `PointerEvent::Released` for drags ([#2507](https://github.com/emilk/egui/pull/2507)).
 * Expose `TextEdit`'s multiline flag to AccessKit ([#2448](https://github.com/emilk/egui/pull/2448)).
 * Don't render `\r` (Carriage Return) ([#2452](https://github.com/emilk/egui/pull/2452)).
+* The `button_padding` style option works closer as expected with image+text buttons now ([#2510](https://github.com/emilk/egui/pull/2510)).
+* Menus are now moved to fit on the screen.
+* Fix `Window::pivot` causing windows to move around ([#2694](https://github.com/emilk/egui/pull/2694)).
 
 
 ## 0.20.1 - 2022-12-11 - Fix key-repeat

Cargo.toml

@@ -5,7 +5,6 @@ members = [
     "crates/egui_demo_app",
     "crates/egui_demo_lib",
     "crates/egui_extras",
-    "crates/egui_glium",
     "crates/egui_glow",
     "crates/egui-wgpu",
     "crates/egui-winit",
@@ -27,7 +26,8 @@ opt-level = 2 # fast and small wasm, basically same as `opt-level = 's'`
 
 
 [profile.dev]
-split-debuginfo = "unpacked" # faster debug builds on mac
+# Can't leave this on by default, because it breaks the Windows build. Related: https://github.com/rust-lang/cargo/issues/4897
+# split-debuginfo = "unpacked" # faster debug builds on mac
 # opt-level = 1                # Make debug builds run faster
 
 # Optimize all dependencies even in debug builds (does not affect workspace packages):

README.md

@@ -66,11 +66,11 @@ To test the demo app locally, run `cargo run --release -p egui_demo_app`.
 
 The native backend is [`egui_glow`](https://github.com/emilk/egui/tree/master/crates/egui_glow) (using [`glow`](https://crates.io/crates/glow)) and should work out-of-the-box on Mac and Windows, but on Linux you need to first run:
 
-`sudo apt-get install -y libclang-dev libgtk-3-dev libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libspeechd-dev libxkbcommon-dev libssl-dev`
+`sudo apt-get install -y libclang-dev libgtk-3-dev libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libxkbcommon-dev libssl-dev`
 
 On Fedora Rawhide you need to run:
 
-`dnf install clang clang-devel clang-tools-extra speech-dispatcher-devel libxkbcommon-devel pkg-config openssl-devel libxcb-devel`
+`dnf install clang clang-devel clang-tools-extra libxkbcommon-devel pkg-config openssl-devel libxcb-devel`
 
 **NOTE**: This is just for the demo app - egui itself is completely platform agnostic!
 
@@ -158,17 +158,17 @@ An integration needs to do the following each frame:
 * **Input**: Gather input (mouse, touches, keyboard, screen size, etc) and give it to egui
 * Run the application code
 * **Output**: Handle egui output (cursor changes, paste, texture allocations, …)
-* **Painting**: Render the triangle mesh egui produces (see [OpenGL example](https://github.com/emilk/egui/blob/master/crates/egui_glium/src/painter.rs))
+* **Painting**: Render the triangle mesh egui produces (see [OpenGL example](https://github.com/emilk/egui/blob/master/crates/egui_glow/src/painter.rs))
 
 ### Official integrations
 
 These are the official egui integrations:
 
-* [`eframe`](https://github.com/emilk/egui/tree/master/crates/eframe) for compiling the same app to web/wasm and desktop/native. Uses `egui_glow` and `egui-winit`.
-* [`egui_glium`](https://github.com/emilk/egui/tree/master/crates/egui_glium) for compiling native apps with [Glium](https://github.com/glium/glium).
+* [`eframe`](https://github.com/emilk/egui/tree/master/crates/eframe) for compiling the same app to web/wasm and desktop/native. Uses `egui-winit` and `egui_glow` or `egui-wgpu`.
 * [`egui_glow`](https://github.com/emilk/egui/tree/master/crates/egui_glow) for rendering egui with [glow](https://github.com/grovesNL/glow) on native and web, and for making native apps.
 * [`egui-wgpu`](https://github.com/emilk/egui/tree/master/crates/egui-wgpu) for [wgpu](https://crates.io/crates/wgpu) (WebGPU API).
 * [`egui-winit`](https://github.com/emilk/egui/tree/master/crates/egui-winit) for integrating with [winit](https://github.com/rust-windowing/winit).
+* [`egui_glium`](https://github.com/emilk/egui/tree/master/crates/egui_glium) for compiling native apps with [Glium](https://github.com/glium/glium) (DEPRECATED - looking for new maintainer).
 
 ### 3rd party integrations
 
@@ -186,13 +186,14 @@ These are the official egui integrations:
 * [`egui-tetra`](https://crates.io/crates/egui-tetra) for [Tetra](https://crates.io/crates/tetra), a 2D game framework.
 * [`egui-winit-ash-integration`](https://github.com/MatchaChoco010/egui-winit-ash-integration) for [winit](https://github.com/rust-windowing/winit) and [ash](https://github.com/MaikKlein/ash).
 * [`fltk-egui`](https://crates.io/crates/fltk-egui) for [fltk-rs](https://github.com/fltk-rs/fltk-rs).
-* [`ggez-egui`](https://github.com/NemuiSen/ggez-egui) for the [ggez](https://ggez.rs/) game framework.
+* [`ggegui`](https://github.com/NemuiSen/ggegui) for the [ggez](https://ggez.rs/) game framework.
 * [`godot-egui`](https://github.com/setzer22/godot-egui) for [godot-rust](https://github.com/godot-rust/godot-rust).
 * [`nannou_egui`](https://github.com/nannou-org/nannou/tree/master/nannou_egui) for [nannou](https://nannou.cc).
 * [`notan_egui`](https://github.com/Nazariglez/notan/tree/main/crates/notan_egui) for [notan](https://github.com/Nazariglez/notan).
 * [`screen-13-egui`](https://github.com/attackgoat/screen-13/tree/master/contrib/screen-13-egui) for [Screen 13](https://github.com/attackgoat/screen-13).
 * [`egui_skia`](https://github.com/lucasmerlin/egui_skia) for [skia](https://github.com/rust-skia/rust-skia/tree/master/skia-safe).
 * [`smithay-egui`](https://github.com/Smithay/smithay-egui) for [smithay](https://github.com/Smithay/smithay/).
+* [`tauri-egui`](https://github.com/tauri-apps/tauri-egui) for [tauri](https://github.com/tauri-apps/tauri).
 
 Missing an integration for the thing you're working on? Create one, it's easy!
 
@@ -371,6 +372,8 @@ egui uses the builder pattern for construction widgets. For instance: `ui.add(La
 
 Instead of using matching `begin/end` style function calls (which can be error prone) egui prefers to use `FnOnce` closures passed to a wrapping function. Lambdas are a bit ugly though, so I'd like to find a nicer solution to this. More discussion of this at <https://github.com/emilk/egui/issues/1004#issuecomment-1001650754>.
 
+egui uses a single `RwLock` for short-time locks on each access of `Context` data. This is to leave implementation simple and transactional and allow users to run their UI logic in parallel. Instead of creating mutex guards, egui uses closures passed to a wrapping function, e.g. `ctx.input(|i| i.key_down(Key::A))`. This is to make it less likely that a user would accidentally double-lock the `Context`, which would lead to a deadlock.
+
 ### Inspiration
 
 The one and only [Dear ImGui](https://github.com/ocornut/imgui) is a great Immediate Mode GUI for C++ which works with many backends. That library revolutionized how I think about GUI code and turned GUI programming from something I hated to do to something I now enjoy.
@@ -396,6 +399,7 @@ Notable contributions by:
 * [@mankinskin](https://github.com/mankinskin): [Context menus](https://github.com/emilk/egui/pull/543).
 * [@t18b219k](https://github.com/t18b219k): [Port glow painter to web](https://github.com/emilk/egui/pull/868).
 * [@danielkeller](https://github.com/danielkeller): [`Context` refactor](https://github.com/emilk/egui/pull/1050).
+* [@MaximOsipenko](https://github.com/MaximOsipenko): [`Context` lock refactor](https://github.com/emilk/egui/pull/2625).
 * And [many more](https://github.com/emilk/egui/graphs/contributors?type=a).
 
 egui is licensed under [MIT](LICENSE-MIT) OR [Apache-2.0](LICENSE-APACHE).

crates/ecolor/CHANGELOG.md

@@ -3,6 +3,9 @@ All notable changes to the `ecolor` crate will be noted in this file.
 
 
 ## Unreleased
+
+
+## 0.21.0 - 2023-02-08
 * Add `Color32::gamma_multiply` ([#2437](https://github.com/emilk/egui/pull/2437)).
 
 

crates/ecolor/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ecolor"
-version = "0.20.0"
+version = "0.21.0"
 authors = [
   "Emil Ernerfeldt <emil.ernerfeldt@gmail.com>",
   "Andreas Reich <reichandreas@gmx.de>",

crates/ecolor/README.md

@@ -1,5 +1,11 @@
 # ecolor - egui color library
 
+[![Latest version](https://img.shields.io/crates/v/ecolor.svg)](https://crates.io/crates/ecolor)
+[![Documentation](https://docs.rs/ecolor/badge.svg)](https://docs.rs/ecolor)
+[![unsafe forbidden](https://img.shields.io/badge/unsafe-forbidden-success.svg)](https://github.com/rust-secure-code/safety-dance/)
+![MIT](https://img.shields.io/badge/license-MIT-blue.svg)
+![Apache](https://img.shields.io/badge/license-Apache-blue.svg)
+
 A simple color storage and conversion library.
 
 Made for [`egui`](https://github.com/emilk/egui/).

crates/ecolor/src/color32.rs

@@ -198,4 +198,19 @@ impl Color32 {
         // we need a somewhat expensive conversion to linear space and back.
         Rgba::from(self).multiply(factor).into()
     }
+
+    /// Converts to floating point values in the range 0-1 without any gamma space conversion.
+    ///
+    /// Use this with great care! In almost all cases, you want to convert to [`crate::Rgba`] instead
+    /// in order to obtain linear space color values.
+    #[inline]
+    pub fn to_normalized_gamma_f32(self) -> [f32; 4] {
+        let Self([r, g, b, a]) = self;
+        [
+            r as f32 / 255.0,
+            g as f32 / 255.0,
+            b as f32 / 255.0,
+            a as f32 / 255.0,
+        ]
+    }
 }

crates/eframe/CHANGELOG.md

@@ -6,12 +6,37 @@ NOTE: [`egui-winit`](../egui-winit/CHANGELOG.md), [`egui_glium`](../egui_glium/C
 
 ## Unreleased
 
+
+## 0.21.3 - 2023-02-15
+* Fix typing the letter 'P' on web ([#2740](https://github.com/emilk/egui/pull/2740)).
+
+
+## 0.21.2 - 2023-02-12
+* Allow compiling `eframe` with `--no-default-features` ([#2728](https://github.com/emilk/egui/pull/2728)).
+
+
+## 0.21.1 - 2023-02-12
+* Fixed crash when native window position is in an invalid state, which could happen e.g. due to changes in monitor size or DPI ([#2722](https://github.com/emilk/egui/issues/2722)).
+
+
+## 0.21.0 - 2023-02-08 - Update to `winit` 0.28
+* ⚠️ BREAKING: `App::clear_color` now expects you to return a raw float array ([#2666](https://github.com/emilk/egui/pull/2666)).
+* The `screen_reader` feature has now been renamed `web_screen_reader` and only work on web. On other platforms, use the `accesskit` feature flag instead ([#2669](https://github.com/emilk/egui/pull/2669)).
+
 #### Desktop/Native:
 * `eframe::run_native` now returns a `Result` ([#2433](https://github.com/emilk/egui/pull/2433)).
+* Update to `winit` 0.28, adding support for mac trackpad zoom ([#2654](https://github.com/emilk/egui/pull/2654)).
+* Fix bug where the cursor could get stuck using the wrong icon.
+* `NativeOptions::transparent` now works with the wgpu backend ([#2684](https://github.com/emilk/egui/pull/2684)).
+* Add `Frame::set_minimized` and `set_maximized` ([#2292](https://github.com/emilk/egui/pull/2292), [#2672](https://github.com/emilk/egui/pull/2672)).
+* Fixed persistence of native window position on Windows OS ([#2583](https://github.com/emilk/egui/issues/2583)).
+
+#### Web:
+* Prevent ctrl-P/cmd-P from opening the print dialog ([#2598](https://github.com/emilk/egui/pull/2598)).
 
 
 ## 0.20.1 - 2022-12-11
-* Fix docs.rs build ([#2420](https://github.com/emilk/egui/pull/2420)).
+* Fix [docs.rs](https://docs.rs/eframe) build ([#2420](https://github.com/emilk/egui/pull/2420)).
 
 
 ## 0.20.0 - 2022-12-08 - AccessKit integration and `wgpu` web support

crates/eframe/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "eframe"
-version = "0.20.1"
+version = "0.21.3"
 authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
 description = "egui framework - write GUI apps that compiles to web and/or natively"
 edition = "2021"
@@ -14,9 +14,7 @@ keywords = ["egui", "gui", "gamedev"]
 include = ["../LICENSE-APACHE", "../LICENSE-MIT", "**/*.rs", "Cargo.toml"]
 
 [package.metadata.docs.rs]
-# Avoid speech-dispatcher dependencies - see https://docs.rs/crate/eframe/0.20.0/builds/695200
-no-default-features = true
-features = ["document-features", "glow", "wgpu", "persistence", "wgpu"]
+all-features = true
 targets = ["x86_64-unknown-linux-gnu", "wasm32-unknown-unknown"]
 
 [lib]
@@ -38,7 +36,7 @@ dark-light = ["dep:dark-light"]
 default_fonts = ["egui/default_fonts"]
 
 ## Use [`glow`](https://github.com/grovesNL/glow) for painting, via [`egui_glow`](https://github.com/emilk/egui/tree/master/crates/egui_glow).
-glow = ["dep:glow", "dep:egui_glow", "dep:glutin"]
+glow = ["dep:glow", "dep:egui_glow", "dep:glutin", "dep:glutin-winit"]
 
 ## Enable saving app state to disk.
 persistence = [
@@ -55,8 +53,10 @@ persistence = [
 ## `eframe` will call `puffin::GlobalProfiler::lock().new_frame()` for you
 puffin = ["dep:puffin", "egui_glow?/puffin", "egui-wgpu?/puffin"]
 
-## Enable screen reader support (requires `ctx.options().screen_reader = true;`)
-screen_reader = ["egui-winit/screen_reader", "tts"]
+## Enable screen reader support (requires `ctx.options_mut(|o| o.screen_reader = true);`) on web.
+##
+## For other platforms, use the "accesskit" feature instead.
+web_screen_reader = ["tts"]
 
 ## If set, eframe will look for the env-var `EFRAME_SCREENSHOT_TO` and write a screenshot to that location, and then quit.
 ## This is used to generate images for the examples.
@@ -68,7 +68,7 @@ wgpu = ["dep:wgpu", "dep:egui-wgpu", "dep:pollster"]
 
 
 [dependencies]
-egui = { version = "0.20.0", path = "../egui", default-features = false, features = [
+egui = { version = "0.21.0", path = "../egui", default-features = false, features = [
   "bytemuck",
   "tracing",
 ] }
@@ -79,44 +79,38 @@ tracing = { version = "0.1", default-features = false, features = ["std"] }
 ## Enable this when generating docs.
 document-features = { version = "0.2", optional = true }
 
-egui_glow = { version = "0.20.0", path = "../egui_glow", optional = true, default-features = false }
-glow = { version = "0.11", optional = true }
+egui_glow = { version = "0.21.0", path = "../egui_glow", optional = true, default-features = false }
+glow = { version = "0.12", optional = true }
 ron = { version = "0.8", optional = true, features = ["integer128"] }
 serde = { version = "1", optional = true, features = ["derive"] }
 
 # -------------------------------------------
 # native:
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
-egui-winit = { version = "0.20.0", path = "../egui-winit", default-features = false, features = [
+egui-winit = { version = "0.21.1", path = "../egui-winit", default-features = false, features = [
   "clipboard",
   "links",
 ] }
 raw-window-handle = { version = "0.5.0" }
-winit = "0.27.2"
+winit = "0.28.1"
 
 # optional native:
-dark-light = { version = "0.2.1", optional = true }
+dark-light = { version = "1.0", optional = true }
 directories-next = { version = "2", optional = true }
-egui-wgpu = { version = "0.20.0", path = "../egui-wgpu", optional = true, features = [
+egui-wgpu = { version = "0.21.0", path = "../egui-wgpu", optional = true, features = [
   "winit",
 ] } # if wgpu is used, use it with winit
-pollster = { version = "0.2", optional = true } # needed for wgpu
+pollster = { version = "0.3", optional = true } # needed for wgpu
 
 # we can expose these to user so that they can select which backends they want to enable to avoid compiling useless deps.
 # this can be done at the same time we expose x11/wayland features of winit crate.
-glutin = { version = "0.30.0", optional = true, es = [
-  "egl",
-  "glx",
-  "x11",
-  "wayland",
-  "wgl",
-] }
-
+glutin = { version = "0.30", optional = true }
+glutin-winit = { version = "0.3.0", optional = true }
 image = { version = "0.24", optional = true, default-features = false, features = [
   "png",
 ] }
 puffin = { version = "0.14", optional = true }
-wgpu = { version = "0.14", optional = true }
+wgpu = { version = "0.15.0", optional = true }
 
 # -------------------------------------------
 # web:
@@ -124,7 +118,7 @@ wgpu = { version = "0.14", optional = true }
 bytemuck = "1.7"
 js-sys = "0.3"
 percent-encoding = "2.1"
-wasm-bindgen = "0.2"
+wasm-bindgen = "=0.2.84"
 wasm-bindgen-futures = "0.4"
 web-sys = { version = "0.3.58", features = [
   "BinaryType",
@@ -170,6 +164,6 @@ web-sys = { version = "0.3.58", features = [
 ] }
 
 # optional web:
-egui-wgpu = { version = "0.20.0", path = "../egui-wgpu", optional = true } # if wgpu is used, use it without (!) winit
-tts = { version = "0.24", optional = true }
-wgpu = { version = "0.14", optional = true, features = ["webgl"] }
+egui-wgpu = { version = "0.21.0", path = "../egui-wgpu", optional = true } # if wgpu is used, use it without (!) winit
+tts = { version = "0.25", optional = true, default-features = false }
+wgpu = { version = "0.15.0", optional = true, features = ["webgl"] }

crates/eframe/README.md

@@ -22,7 +22,7 @@ For how to use `egui`, see [the egui docs](https://docs.rs/egui).
 To use on Linux, first run:
 
 ```
-sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libspeechd-dev libxkbcommon-dev libssl-dev
+sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libxkbcommon-dev libssl-dev
 ```
 
 You need to either use `edition = "2021"`, or set `resolver = "2"` in the `[workspace]` section of your to-level `Cargo.toml`. See [this link](https://doc.rust-lang.org/edition-guide/rust-2021/default-cargo-resolver.html) for more info.

crates/eframe/src/epi.rs

@@ -10,9 +10,11 @@
 use std::any::Any;
 
 #[cfg(not(target_arch = "wasm32"))]
+#[cfg(any(feature = "glow", feature = "wgpu"))]
 pub use crate::native::run::UserEvent;
 
 #[cfg(not(target_arch = "wasm32"))]
+#[cfg(any(feature = "glow", feature = "wgpu"))]
 pub use winit::event_loop::EventLoopBuilder;
 
 /// Hook into the building of an event loop before it is run
@@ -20,6 +22,7 @@ pub use winit::event_loop::EventLoopBuilder;
 /// You can configure any platform specific details required on top of the default configuration
 /// done by `EFrame`.
 #[cfg(not(target_arch = "wasm32"))]
+#[cfg(any(feature = "glow", feature = "wgpu"))]
 pub type EventLoopBuilderHook = Box<dyn FnOnce(&mut EventLoopBuilder<UserEvent>)>;
 
 /// This is how your app is created.
@@ -149,13 +152,21 @@ pub trait App {
         egui::Vec2::INFINITY
     }
 
-    /// Background color for the app, e.g. what is sent to `gl.clearColor`.
+    /// Background color values for the app, e.g. what is sent to `gl.clearColor`.
+    ///
     /// This is the background of your windows if you don't set a central panel.
-    fn clear_color(&self, _visuals: &egui::Visuals) -> egui::Rgba {
+    ///
+    /// ATTENTION:
+    /// Since these float values go to the render as-is, any color space conversion as done
+    /// e.g. by converting from [`egui::Color32`] to [`egui::Rgba`] may cause incorrect results.
+    /// egui recommends that rendering backends use a normal "gamma-space" (non-sRGB-aware) blending,
+    ///  which means the values you return here should also be in `sRGB` gamma-space in the 0-1 range.
+    /// You can use [`egui::Color32::to_normalized_gamma_f32`] for this.
+    fn clear_color(&self, _visuals: &egui::Visuals) -> [f32; 4] {
         // NOTE: a bright gray makes the shadows of the windows look weird.
         // We use a bit of transparency so that if the user switches on the
         // `transparent()` option they get immediate results.
-        egui::Color32::from_rgba_unmultiplied(12, 12, 12, 180).into()
+        egui::Color32::from_rgba_unmultiplied(12, 12, 12, 180).to_normalized_gamma_f32()
 
         // _visuals.window_fill() would also be a natural choice
     }
@@ -173,7 +184,7 @@ pub trait App {
     }
 
     /// If `true` a warm-up call to [`Self::update`] will be issued where
-    /// `ctx.memory().everything_is_visible()` will be set to `true`.
+    /// `ctx.memory(|mem| mem.everything_is_visible())` will be set to `true`.
     ///
     /// This can help pre-caching resources loaded by different parts of the UI, preventing stutter later on.
     ///
@@ -309,6 +320,7 @@ pub struct NativeOptions {
     pub hardware_acceleration: HardwareAcceleration,
 
     /// What rendering backend to use.
+    #[cfg(any(feature = "glow", feature = "wgpu"))]
     pub renderer: Renderer,
 
     /// Only used if the `dark-light` feature is enabled:
@@ -347,6 +359,7 @@ pub struct NativeOptions {
     /// event loop before it is run.
     ///
     /// Note: A [`NativeOptions`] clone will not include any `event_loop_builder` hook.
+    #[cfg(any(feature = "glow", feature = "wgpu"))]
     pub event_loop_builder: Option<EventLoopBuilderHook>,
 
     #[cfg(feature = "glow")]
@@ -373,9 +386,13 @@ impl Clone for NativeOptions {
     fn clone(&self) -> Self {
         Self {
             icon_data: self.icon_data.clone(),
+
+            #[cfg(any(feature = "glow", feature = "wgpu"))]
             event_loop_builder: None, // Skip any builder callbacks if cloning
+
             #[cfg(feature = "wgpu")]
             wgpu_options: self.wgpu_options.clone(),
+
             ..*self
         }
     }
@@ -389,8 +406,10 @@ impl Default for NativeOptions {
             maximized: false,
             decorated: true,
             fullscreen: false,
+
             #[cfg(target_os = "macos")]
             fullsize_content: false,
+
             drag_and_drop_support: true,
             icon_data: None,
             initial_window_pos: None,
@@ -405,14 +424,22 @@ impl Default for NativeOptions {
             depth_buffer: 0,
             stencil_buffer: 0,
             hardware_acceleration: HardwareAcceleration::Preferred,
+
+            #[cfg(any(feature = "glow", feature = "wgpu"))]
             renderer: Renderer::default(),
+
             follow_system_theme: cfg!(target_os = "macos") || cfg!(target_os = "windows"),
             default_theme: Theme::Dark,
             run_and_return: true,
+
+            #[cfg(any(feature = "glow", feature = "wgpu"))]
             event_loop_builder: None,
+
             #[cfg(feature = "glow")]
             shader_version: None,
+
             centered: false,
+
             #[cfg(feature = "wgpu")]
             wgpu_options: egui_wgpu::WgpuConfiguration::default(),
         }
@@ -429,6 +456,7 @@ impl NativeOptions {
             match dark_light::detect() {
                 dark_light::Mode::Dark => Some(Theme::Dark),
                 dark_light::Mode::Light => Some(Theme::Light),
+                dark_light::Mode::Default => None,
             }
         } else {
             None
@@ -550,6 +578,7 @@ pub enum WebGlContextOption {
 /// What rendering backend to use.
 ///
 /// You need to enable the "glow" and "wgpu" features to have a choice.
+#[cfg(any(feature = "glow", feature = "wgpu"))]
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[cfg_attr(feature = "serde", serde(rename_all = "snake_case"))]
@@ -563,6 +592,7 @@ pub enum Renderer {
     Wgpu,
 }
 
+#[cfg(any(feature = "glow", feature = "wgpu"))]
 impl Default for Renderer {
     fn default() -> Self {
         #[cfg(feature = "glow")]
@@ -578,6 +608,7 @@ impl Default for Renderer {
     }
 }
 
+#[cfg(any(feature = "glow", feature = "wgpu"))]
 impl std::fmt::Display for Renderer {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
@@ -590,6 +621,7 @@ impl std::fmt::Display for Renderer {
     }
 }
 
+#[cfg(any(feature = "glow", feature = "wgpu"))]
 impl std::str::FromStr for Renderer {
     type Err = String;
 
@@ -709,6 +741,18 @@ impl Frame {
         self.output.close = true;
     }
 
+    /// Minimize or unminimize window. (native only)
+    #[cfg(not(target_arch = "wasm32"))]
+    pub fn set_minimized(&mut self, minimized: bool) {
+        self.output.minimized = Some(minimized);
+    }
+
+    /// Maximize or unmaximize window. (native only)
+    #[cfg(not(target_arch = "wasm32"))]
+    pub fn set_maximized(&mut self, maximized: bool) {
+        self.output.maximized = Some(maximized);
+    }
+
     /// Tell `eframe` to close the desktop window.
     #[cfg(not(target_arch = "wasm32"))]
     #[deprecated = "Renamed `close`"]
@@ -790,6 +834,7 @@ impl Frame {
     }
 
     /// for integrations only: call once per frame
+    #[cfg(any(feature = "glow", feature = "wgpu"))]
     pub(crate) fn take_app_output(&mut self) -> backend::AppOutput {
         std::mem::take(&mut self.output)
     }
@@ -820,6 +865,12 @@ pub struct WindowInfo {
     /// Are we in fullscreen mode?
     pub fullscreen: bool,
 
+    /// Are we minimized?
+    pub minimized: bool,
+
+    /// Are we maximized?
+    pub maximized: bool,
+
     /// Window inner size in egui points (logical pixels).
     pub size: egui::Vec2,
 
@@ -1002,5 +1053,13 @@ pub(crate) mod backend {
         /// Set to some bool to tell the window always on top.
         #[cfg(not(target_arch = "wasm32"))]
         pub always_on_top: Option<bool>,
+
+        /// Set to some bool to minimize or unminimize window.
+        #[cfg(not(target_arch = "wasm32"))]
+        pub minimized: Option<bool>,
+
+        /// Set to some bool to maximize or unmaximize window.
+        #[cfg(not(target_arch = "wasm32"))]
+        pub maximized: Option<bool>,
     }
 }

crates/eframe/src/lib.rs

@@ -137,6 +137,7 @@ pub async fn start_web(
 // When compiling natively
 
 #[cfg(not(target_arch = "wasm32"))]
+#[cfg(any(feature = "glow", feature = "wgpu"))]
 mod native;
 
 /// This is how you start a native (desktop) app.
@@ -179,6 +180,7 @@ mod native;
 /// This function can fail if we fail to set up a graphics context.
 #[cfg(not(target_arch = "wasm32"))]
 #[allow(clippy::needless_pass_by_value)]
+#[cfg(any(feature = "glow", feature = "wgpu"))]
 pub fn run_native(
     app_name: &str,
     native_options: NativeOptions,
@@ -221,36 +223,40 @@ pub enum Error {
     Glutin(#[from] glutin::error::Error),
 
     #[cfg(all(feature = "glow", not(target_arch = "wasm32")))]
-    #[error("Found no glutin configs matching the template: {0:?}")]
-    NoGlutinConfigs(glutin::config::ConfigTemplate),
+    #[error("Found no glutin configs matching the template: {0:?}. error: {1:?}")]
+    NoGlutinConfigs(glutin::config::ConfigTemplate, Box<dyn std::error::Error>),
 
     #[cfg(feature = "wgpu")]
     #[error("WGPU error: {0}")]
-    Wgpu(#[from] wgpu::RequestDeviceError),
+    Wgpu(#[from] egui_wgpu::WgpuError),
 }
 
 pub type Result<T> = std::result::Result<T, Error>;
 
 // ---------------------------------------------------------------------------
 
-/// Profiling macro for feature "puffin"
 #[cfg(not(target_arch = "wasm32"))]
-macro_rules! profile_function {
+#[cfg(any(feature = "glow", feature = "wgpu"))]
+mod profiling_scopes {
+    /// Profiling macro for feature "puffin"
+    macro_rules! profile_function {
     ($($arg: tt)*) => {
         #[cfg(feature = "puffin")]
         puffin::profile_function!($($arg)*);
     };
 }
-#[cfg(not(target_arch = "wasm32"))]
-pub(crate) use profile_function;
+    pub(crate) use profile_function;
 
-/// Profiling macro for feature "puffin"
-#[cfg(not(target_arch = "wasm32"))]
-macro_rules! profile_scope {
+    /// Profiling macro for feature "puffin"
+    macro_rules! profile_scope {
     ($($arg: tt)*) => {
         #[cfg(feature = "puffin")]
         puffin::profile_scope!($($arg)*);
     };
 }
+    pub(crate) use profile_scope;
+}
+
 #[cfg(not(target_arch = "wasm32"))]
-pub(crate) use profile_scope;
+#[cfg(any(feature = "glow", feature = "wgpu"))]
+pub(crate) use profiling_scopes::*;

crates/eframe/src/native/epi_integration.rs

@@ -12,6 +12,14 @@ use egui_winit::{native_pixels_per_point, EventResponse, WindowSettings};
 
 use crate::{epi, Theme, WindowInfo};
 
+#[derive(Default)]
+pub struct WindowState {
+    // We cannot simply call `winit::Window::is_minimized/is_maximized`
+    // because that deadlocks on mac.
+    pub minimized: bool,
+    pub maximized: bool,
+}
+
 pub fn points_to_size(points: egui::Vec2) -> winit::dpi::LogicalSize<f64> {
     winit::dpi::LogicalSize {
         width: points.x as f64,
@@ -19,7 +27,11 @@ pub fn points_to_size(points: egui::Vec2) -> winit::dpi::LogicalSize<f64> {
     }
 }
 
-pub fn read_window_info(window: &winit::window::Window, pixels_per_point: f32) -> WindowInfo {
+pub fn read_window_info(
+    window: &winit::window::Window,
+    pixels_per_point: f32,
+    window_state: &WindowState,
+) -> WindowInfo {
     let position = window
         .outer_position()
         .ok()
@@ -38,9 +50,13 @@ pub fn read_window_info(window: &winit::window::Window, pixels_per_point: f32) -
         .inner_size()
         .to_logical::<f32>(pixels_per_point.into());
 
+    // NOTE: calling window.is_minimized() or window.is_maximized() deadlocks on Mac.
+
     WindowInfo {
         position,
         fullscreen: window.fullscreen().is_some(),
+        minimized: window_state.minimized,
+        maximized: window_state.maximized,
         size: egui::Vec2 {
             x: size.width,
             y: size.height,
@@ -56,7 +72,6 @@ pub fn window_builder<E>(
     window_settings: Option<WindowSettings>,
 ) -> winit::window::WindowBuilder {
     let epi::NativeOptions {
-        always_on_top,
         maximized,
         decorated,
         fullscreen,
@@ -70,6 +85,7 @@ pub fn window_builder<E>(
         max_window_size,
         resizable,
         transparent,
+        centered,
         ..
     } = native_options;
 
@@ -77,7 +93,6 @@ pub fn window_builder<E>(
 
     let mut window_builder = winit::window::WindowBuilder::new()
         .with_title(title)
-        .with_always_on_top(*always_on_top)
         .with_decorations(*decorated)
         .with_fullscreen(fullscreen.then(|| winit::window::Fullscreen::Borderless(None)))
         .with_maximized(*maximized)
@@ -105,13 +120,16 @@ pub fn window_builder<E>(
 
     window_builder = window_builder_drag_and_drop(window_builder, *drag_and_drop_support);
 
-    if let Some(mut window_settings) = window_settings {
+    let inner_size_points = if let Some(mut window_settings) = window_settings {
         // Restore pos/size from previous session
         window_settings.clamp_to_sane_values(largest_monitor_point_size(event_loop));
+        #[cfg(windows)]
+        window_settings.clamp_window_to_sane_position(&event_loop);
         window_builder = window_settings.initialize_window(window_builder);
+        window_settings.inner_size_points()
     } else {
         if let Some(pos) = *initial_window_pos {
-            window_builder = window_builder.with_position(winit::dpi::PhysicalPosition {
+            window_builder = window_builder.with_position(winit::dpi::LogicalPosition {
                 x: pos.x as f64,
                 y: pos.y as f64,
             });
@@ -122,11 +140,39 @@ pub fn window_builder<E>(
                 initial_window_size.at_most(largest_monitor_point_size(event_loop));
             window_builder = window_builder.with_inner_size(points_to_size(initial_window_size));
         }
-    }
 
+        *initial_window_size
+    };
+
+    if *centered {
+        if let Some(monitor) = event_loop.available_monitors().next() {
+            let monitor_size = monitor.size();
+            let inner_size = inner_size_points.unwrap_or(egui::Vec2 { x: 800.0, y: 600.0 });
+            if monitor_size.width > 0 && monitor_size.height > 0 {
+                let x = (monitor_size.width - inner_size.x as u32) / 2;
+                let y = (monitor_size.height - inner_size.y as u32) / 2;
+                window_builder = window_builder.with_position(winit::dpi::LogicalPosition {
+                    x: x as f64,
+                    y: y as f64,
+                });
+            }
+        }
+    }
     window_builder
 }
 
+pub fn apply_native_options_to_window(
+    window: &winit::window::Window,
+    native_options: &crate::NativeOptions,
+) {
+    use winit::window::WindowLevel;
+    window.set_window_level(if native_options.always_on_top {
+        WindowLevel::AlwaysOnTop
+    } else {
+        WindowLevel::Normal
+    });
+}
+
 fn largest_monitor_point_size<E>(event_loop: &EventLoopWindowTarget<E>) -> egui::Vec2 {
     let mut max_size = egui::Vec2::ZERO;
 
@@ -169,6 +215,7 @@ pub fn handle_app_output(
     window: &winit::window::Window,
     current_pixels_per_point: f32,
     app_output: epi::backend::AppOutput,
+    window_state: &mut WindowState,
 ) {
     let epi::backend::AppOutput {
         close: _,
@@ -180,6 +227,8 @@ pub fn handle_app_output(
         window_pos,
         visible: _, // handled in post_present
         always_on_top,
+        minimized,
+        maximized,
     } = app_output;
 
     if let Some(decorated) = decorated {
@@ -216,7 +265,22 @@ pub fn handle_app_output(
     }
 
     if let Some(always_on_top) = always_on_top {
-        window.set_always_on_top(always_on_top);
+        use winit::window::WindowLevel;
+        window.set_window_level(if always_on_top {
+            WindowLevel::AlwaysOnTop
+        } else {
+            WindowLevel::Normal
+        });
+    }
+
+    if let Some(minimized) = minimized {
+        window.set_minimized(minimized);
+        window_state.minimized = minimized;
+    }
+
+    if let Some(maximized) = maximized {
+        window.set_maximized(maximized);
+        window_state.maximized = maximized;
     }
 }
 
@@ -243,6 +307,7 @@ pub struct EpiIntegration {
     /// When set, it is time to close the native window.
     close: bool,
     can_drag_window: bool,
+    window_state: WindowState,
 }
 
 impl EpiIntegration {
@@ -257,16 +322,22 @@ impl EpiIntegration {
     ) -> Self {
         let egui_ctx = egui::Context::default();
 
-        *egui_ctx.memory() = load_egui_memory(storage.as_deref()).unwrap_or_default();
+        let memory = load_egui_memory(storage.as_deref()).unwrap_or_default();
+        egui_ctx.memory_mut(|mem| *mem = memory);
 
         let native_pixels_per_point = window.scale_factor() as f32;
 
+        let window_state = WindowState {
+            minimized: window.is_minimized().unwrap_or(false),
+            maximized: window.is_maximized(),
+        };
+
         let frame = epi::Frame {
             info: epi::IntegrationInfo {
                 system_theme,
                 cpu_usage: None,
                 native_pixels_per_point: Some(native_pixels_per_point),
-                window_info: read_window_info(window, egui_ctx.pixels_per_point()),
+                window_info: read_window_info(window, egui_ctx.pixels_per_point(), &window_state),
             },
             output: epi::backend::AppOutput {
                 visible: Some(true),
@@ -291,6 +362,7 @@ impl EpiIntegration {
             pending_full_output: Default::default(),
             close: false,
             can_drag_window: false,
+            window_state,
         }
     }
 
@@ -309,17 +381,18 @@ impl EpiIntegration {
                 egui_ctx.enable_accesskit();
                 // Enqueue a repaint so we'll receive a full tree update soon.
                 egui_ctx.request_repaint();
-                egui::accesskit_placeholder_tree_update()
+                egui_ctx.accesskit_placeholder_tree_update()
             });
     }
 
     pub fn warm_up(&mut self, app: &mut dyn epi::App, window: &winit::window::Window) {
         crate::profile_function!();
-        let saved_memory: egui::Memory = self.egui_ctx.memory().clone();
-        self.egui_ctx.memory().set_everything_is_visible(true);
+        let saved_memory: egui::Memory = self.egui_ctx.memory(|mem| mem.clone());
+        self.egui_ctx
+            .memory_mut(|mem| mem.set_everything_is_visible(true));
         let full_output = self.update(app, window);
         self.pending_full_output.append(full_output); // Handle it next frame
-        *self.egui_ctx.memory() = saved_memory; // We don't want to remember that windows were huge.
+        self.egui_ctx.memory_mut(|mem| *mem = saved_memory); // We don't want to remember that windows were huge.
         self.egui_ctx.clear_animations();
     }
 
@@ -371,12 +444,16 @@ impl EpiIntegration {
     ) -> egui::FullOutput {
         let frame_start = std::time::Instant::now();
 
-        self.frame.info.window_info = read_window_info(window, self.egui_ctx.pixels_per_point());
+        self.frame.info.window_info =
+            read_window_info(window, self.egui_ctx.pixels_per_point(), &self.window_state);
         let raw_input = self.egui_winit.take_egui_input(window);
+
+        // Run user code:
         let full_output = self.egui_ctx.run(raw_input, |egui_ctx| {
             crate::profile_scope!("App::update");
             app.update(egui_ctx, &mut self.frame);
         });
+
         self.pending_full_output.append(full_output);
         let full_output = std::mem::take(&mut self.pending_full_output);
 
@@ -389,7 +466,12 @@ impl EpiIntegration {
                 tracing::debug!("App::on_close_event returned {}", self.close);
             }
             self.frame.output.visible = app_output.visible; // this is handled by post_present
-            handle_app_output(window, self.egui_ctx.pixels_per_point(), app_output);
+            handle_app_output(
+                window,
+                self.egui_ctx.pixels_per_point(),
+                app_output,
+                &mut self.window_state,
+            );
         }
 
         let frame_time = frame_start.elapsed().as_secs_f64() as f32;
@@ -446,7 +528,8 @@ impl EpiIntegration {
             }
             if _app.persist_egui_memory() {
                 crate::profile_scope!("egui_memory");
-                epi::set_value(storage, STORAGE_EGUI_MEMORY_KEY, &*self.egui_ctx.memory());
+                self.egui_ctx
+                    .memory(|mem| epi::set_value(storage, STORAGE_EGUI_MEMORY_KEY, mem));
             }
             {
                 crate::profile_scope!("App::save");

crates/eframe/src/native/run.rs

@@ -38,6 +38,7 @@ pub use epi::NativeOptions;
 #[derive(Debug)]
 enum EventResult {
     Wait,
+
     /// Causes a synchronous repaint inside the event handler. This should only
     /// be used in special situations if the window must be repainted while
     /// handling a specific event. This occurs on Windows when handling resizes.
@@ -45,20 +46,28 @@ enum EventResult {
     /// `RepaintNow` creates a new frame synchronously, and should therefore
     /// only be used for extremely urgent repaints.
     RepaintNow,
+
     /// Queues a repaint for once the event loop handles its next redraw. Exists
     /// so that multiple input events can be handled in one frame. Does not
     /// cause any delay like `RepaintNow`.
     RepaintNext,
+
     RepaintAt(Instant),
+
     Exit,
 }
 
 trait WinitApp {
     fn is_focused(&self) -> bool;
+
     fn integration(&self) -> Option<&EpiIntegration>;
+
     fn window(&self) -> Option<&winit::window::Window>;
+
     fn save_and_destroy(&mut self);
+
     fn paint(&mut self) -> EventResult;
+
     fn on_event(
         &mut self,
         event_loop: &EventLoopWindowTarget<UserEvent>,
@@ -152,8 +161,8 @@ fn run_and_return(
             event => match winit_app.on_event(event_loop, event) {
                 Ok(event_result) => event_result,
                 Err(err) => {
+                    tracing::error!("Exiting because of error: {err:?} on event {event:?}");
                     returned_result = Err(err);
-                    tracing::debug!("Exiting because of an error");
                     EventResult::Exit
                 }
             },
@@ -290,27 +299,6 @@ fn run_and_exit(event_loop: EventLoop<UserEvent>, mut winit_app: impl WinitApp +
     })
 }
 
-fn center_window_pos(
-    monitor: Option<winit::monitor::MonitorHandle>,
-    native_options: &mut epi::NativeOptions,
-) {
-    // Get the current_monitor.
-    if let Some(monitor) = monitor {
-        let monitor_size = monitor.size();
-        let inner_size = native_options
-            .initial_window_size
-            .unwrap_or(egui::Vec2 { x: 800.0, y: 600.0 });
-        if monitor_size.width > 0 && monitor_size.height > 0 {
-            let x = (monitor_size.width - inner_size.x as u32) / 2;
-            let y = (monitor_size.height - inner_size.y as u32) / 2;
-            native_options.initial_window_pos = Some(egui::Pos2 {
-                x: x as _,
-                y: y as _,
-            });
-        }
-    }
-}
-
 // ----------------------------------------------------------------------------
 /// Run an egui app
 #[cfg(feature = "glow")]
@@ -318,6 +306,12 @@ mod glow_integration {
     use std::sync::Arc;
 
     use egui::NumExt as _;
+    use glutin::{
+        display::GetGlDisplay,
+        prelude::{GlDisplay, NotCurrentGlContextSurfaceAccessor, PossiblyCurrentGlContext},
+        surface::GlSurface,
+    };
+    use raw_window_handle::HasRawWindowHandle;
 
     use super::*;
 
@@ -342,132 +336,260 @@ mod glow_integration {
         painter: egui_glow::Painter,
         integration: epi_integration::EpiIntegration,
         app: Box<dyn epi::App>,
-
         // Conceptually this will be split out eventually so that the rest of the state
         // can be persistent.
         gl_window: GlutinWindowContext,
     }
+
+    /// This struct will contain both persistent and temporary glutin state.
+    ///
+    /// Platform Quirks:
+    /// * Microsoft Windows: requires that we create a window before opengl context.
+    /// * Android: window and surface should be destroyed when we receive a suspend event. recreate on resume event.
+    ///
+    /// winit guarantees that we will get a Resumed event on startup on all platforms.
+    /// * Before Resumed event: `gl_config`, `gl_context` can be created at any time. on windows, a window must be created to get `gl_context`.
+    /// * Resumed: `gl_surface` will be created here. `window` will be re-created here for android.
+    /// * Suspended: on android, we drop window + surface.  on other platforms, we don't get Suspended event.
+    ///
+    /// The setup is divided between the `new` fn and `on_resume` fn. we can just assume that `on_resume` is a continuation of
+    /// `new` fn on all platforms. only on android, do we get multiple resumed events because app can be suspended.
     struct GlutinWindowContext {
-        window: winit::window::Window,
-        gl_context: glutin::context::PossiblyCurrentContext,
-        gl_display: glutin::display::Display,
-        gl_surface: glutin::surface::Surface<glutin::surface::WindowSurface>,
+        builder: winit::window::WindowBuilder,
+        swap_interval: glutin::surface::SwapInterval,
+        gl_config: glutin::config::Config,
+        current_gl_context: Option<glutin::context::PossiblyCurrentContext>,
+        gl_surface: Option<glutin::surface::Surface<glutin::surface::WindowSurface>>,
+        not_current_gl_context: Option<glutin::context::NotCurrentContext>,
+        window: Option<winit::window::Window>,
     }
 
     impl GlutinWindowContext {
-        // refactor this function to use `glutin-winit` crate eventually.
-        // preferably add android support at the same time.
+        /// There is a lot of complexity with opengl creation, so prefer extensivve logging to get all the help we can to debug issues.
+        ///
         #[allow(unsafe_code)]
         unsafe fn new(
-            winit_window: winit::window::Window,
+            winit_window_builder: winit::window::WindowBuilder,
             native_options: &epi::NativeOptions,
+            event_loop: &EventLoopWindowTarget<UserEvent>,
         ) -> Result<Self> {
             use glutin::prelude::*;
-            use raw_window_handle::*;
+            // convert native options to glutin options
             let hardware_acceleration = match native_options.hardware_acceleration {
                 crate::HardwareAcceleration::Required => Some(true),
                 crate::HardwareAcceleration::Preferred => None,
                 crate::HardwareAcceleration::Off => Some(false),
             };
-
-            let raw_display_handle = winit_window.raw_display_handle();
-            let raw_window_handle = winit_window.raw_window_handle();
-
-            // EGL is crossplatform and the official khronos way
-            // but sometimes platforms/drivers may not have it, so we use back up options where possible.
-            // TODO: check whether we can expose these options as "features", so that users can select the relevant backend they want.
-
-            // try egl and fallback to windows wgl. Windows is the only platform that *requires* window handle to create display.
-            #[cfg(target_os = "windows")]
-            let preference =
-                glutin::display::DisplayApiPreference::EglThenWgl(Some(raw_window_handle));
-            // try egl and fallback to x11 glx
-            #[cfg(target_os = "linux")]
-            let preference = glutin::display::DisplayApiPreference::EglThenGlx(Box::new(
-                winit::platform::unix::register_xlib_error_hook,
-            ));
-            #[cfg(target_os = "macos")]
-            let preference = glutin::display::DisplayApiPreference::Cgl;
-            #[cfg(target_os = "android")]
-            let preference = glutin::display::DisplayApiPreference::Egl;
-
-            let gl_display = glutin::display::Display::new(raw_display_handle, preference)?;
             let swap_interval = if native_options.vsync {
                 glutin::surface::SwapInterval::Wait(std::num::NonZeroU32::new(1).unwrap())
             } else {
                 glutin::surface::SwapInterval::DontWait
             };
-
-            let config_template = glutin::config::ConfigTemplateBuilder::new()
+            /*  opengl setup flow goes like this:
+                1. we create a configuration for opengl "Display" / "Config" creation
+                2. choose between special extensions like glx or egl or wgl and use them to create config/display
+                3. opengl context configuration
+                4. opengl context creation
+            */
+            // start building config for gl display
+            let config_template_builder = glutin::config::ConfigTemplateBuilder::new()
                 .prefer_hardware_accelerated(hardware_acceleration)
-                .with_depth_size(native_options.depth_buffer);
+                .with_depth_size(native_options.depth_buffer)
+                .with_stencil_size(native_options.stencil_buffer)
+                .with_transparency(native_options.transparent);
             // we don't know if multi sampling option is set. so, check if its more than 0.
-            let config_template = if native_options.multisampling > 0 {
-                config_template.with_multisampling(
+            let config_template_builder = if native_options.multisampling > 0 {
+                config_template_builder.with_multisampling(
                     native_options
                         .multisampling
                         .try_into()
-                        .expect("failed to fit multisamples into u8"),
+                        .expect("failed to fit multisamples option of native_options into u8"),
                 )
             } else {
-                config_template
+                config_template_builder
             };
-            let config_template = config_template
-                .with_stencil_size(native_options.stencil_buffer)
-                .with_transparency(native_options.transparent)
-                .compatible_with_native_window(raw_window_handle)
-                .build();
-            // finds all valid configurations supported by this display that match the config_template
-            // this is where we will try to get a "fallback" config if we are okay with ignoring some native
-            // options required by user like multi sampling, srgb, transparency etc..
-            // TODO: need to figure out a good fallback config template
-            let config = gl_display
-                .find_configs(config_template.clone())?
-                .next()
-                .ok_or(crate::Error::NoGlutinConfigs(config_template))?;
 
+            tracing::debug!(
+                "trying to create glutin Display with config: {:?}",
+                &config_template_builder
+            );
+            // create gl display. this may probably create a window too on most platforms. definitely on `MS windows`. never on android.
+            let (window, gl_config) = glutin_winit::DisplayBuilder::new()
+                // we might want to expose this option to users in the future. maybe using an env var or using native_options.
+                .with_preference(glutin_winit::ApiPrefence::FallbackEgl) // https://github.com/emilk/egui/issues/2520#issuecomment-1367841150
+                .with_window_builder(Some(winit_window_builder.clone()))
+                .build(
+                    event_loop,
+                    config_template_builder.clone(),
+                    |mut config_iterator| {
+                        let config = config_iterator.next().expect(
+                            "failed to find a matching configuration for creating glutin config",
+                        );
+                        tracing::debug!(
+                            "using the first config from config picker closure. config: {:?}",
+                            &config
+                        );
+                        config
+                    },
+                )
+                .map_err(|e| crate::Error::NoGlutinConfigs(config_template_builder.build(), e))?;
+
+            let gl_display = gl_config.display();
+            tracing::debug!(
+                "successfully created GL Display with version: {} and supported features: {:?}",
+                gl_display.version_string(),
+                gl_display.supported_features()
+            );
+            let raw_window_handle = window.as_ref().map(|w| w.raw_window_handle());
+            tracing::debug!(
+                "creating gl context using raw window handle: {:?}",
+                raw_window_handle
+            );
+
+            // create gl context. if core context cannot be created, try gl es context as fallback.
             let context_attributes =
-                glutin::context::ContextAttributesBuilder::new().build(Some(raw_window_handle));
-            // for surface creation.
-            let (width, height): (u32, u32) = winit_window.inner_size().into();
+                glutin::context::ContextAttributesBuilder::new().build(raw_window_handle);
+            let fallback_context_attributes = glutin::context::ContextAttributesBuilder::new()
+                .with_context_api(glutin::context::ContextApi::Gles(None))
+                .build(raw_window_handle);
+            let gl_context = match gl_config
+                .display()
+                .create_context(&gl_config, &context_attributes)
+            {
+                Ok(it) => it,
+                Err(err) => {
+                    tracing::warn!("failed to create context using default context attributes {context_attributes:?} due to error: {err}");
+                    tracing::debug!("retrying with fallback context attributes: {fallback_context_attributes:?}");
+                    gl_config
+                        .display()
+                        .create_context(&gl_config, &fallback_context_attributes)?
+                }
+            };
+            let not_current_gl_context = Some(gl_context);
+
+            // the fun part with opengl gl is that we never know whether there is an error. the context creation might have failed, but
+            // it could keep working until we try to make surface current or swap buffers or something else. future glutin improvements might
+            // help us start from scratch again if we fail context creation and go back to preferEgl or try with different config etc..
+            // https://github.com/emilk/egui/pull/2541#issuecomment-1370767582
+            Ok(GlutinWindowContext {
+                builder: winit_window_builder,
+                swap_interval,
+                gl_config,
+                current_gl_context: None,
+                window,
+                gl_surface: None,
+                not_current_gl_context,
+            })
+        }
+
+        /// This will be run after `new`. on android, it might be called multiple times over the course of the app's lifetime.
+        /// roughly,
+        /// 1. check if window already exists. otherwise, create one now.
+        /// 2. create attributes for surface creation.
+        /// 3. create surface.
+        /// 4. make surface and context current.
+        ///
+        /// we presently assume that we will
+        #[allow(unsafe_code)]
+        fn on_resume(&mut self, event_loop: &EventLoopWindowTarget<UserEvent>) -> Result<()> {
+            if self.gl_surface.is_some() {
+                tracing::warn!(
+                    "on_resume called even thought we already have a surface. early return"
+                );
+                return Ok(());
+            }
+            tracing::debug!("running on_resume fn.");
+            // make sure we have a window or create one.
+            let window = self.window.take().unwrap_or_else(|| {
+                tracing::debug!("window doesn't exist yet. creating one now with finalize_window");
+                glutin_winit::finalize_window(event_loop, self.builder.clone(), &self.gl_config)
+                    .expect("failed to finalize glutin window")
+            });
+            // surface attributes
+            let (width, height): (u32, u32) = window.inner_size().into();
             let width = std::num::NonZeroU32::new(width.at_least(1)).unwrap();
             let height = std::num::NonZeroU32::new(height.at_least(1)).unwrap();
             let surface_attributes =
                 glutin::surface::SurfaceAttributesBuilder::<glutin::surface::WindowSurface>::new()
-                    .build(raw_window_handle, width, height);
-            // start creating the gl objects
-            let gl_context = gl_display.create_context(&config, &context_attributes)?;
+                    .build(window.raw_window_handle(), width, height);
+            tracing::debug!(
+                "creating surface with attributes: {:?}",
+                &surface_attributes
+            );
+            // create surface
+            let gl_surface = unsafe {
+                self.gl_config
+                    .display()
+                    .create_window_surface(&self.gl_config, &surface_attributes)?
+            };
+            tracing::debug!("surface created successfully: {gl_surface:?}.making context current");
+            // make surface and context current.
+            let not_current_gl_context = self
+                .not_current_gl_context
+                .take()
+                .expect("failed to get not current context after resume event. impossible!");
+            let current_gl_context = not_current_gl_context.make_current(&gl_surface)?;
+            // try setting swap interval. but its not absolutely necessary, so don't panic on failure.
+            tracing::debug!("made context current. setting swap interval for surface");
+            if let Err(e) = gl_surface.set_swap_interval(&current_gl_context, self.swap_interval) {
+                tracing::error!("failed to set swap interval due to error: {e:?}");
+            }
+            // we will reach this point only once in most platforms except android.
+            // create window/surface/make context current once and just use them forever.
+            self.gl_surface = Some(gl_surface);
+            self.current_gl_context = Some(current_gl_context);
+            self.window = Some(window);
+            Ok(())
+        }
 
-            let gl_surface = gl_display.create_window_surface(&config, &surface_attributes)?;
-            let gl_context = gl_context.make_current(&gl_surface)?;
-            gl_surface.set_swap_interval(&gl_context, swap_interval)?;
-            Ok(GlutinWindowContext {
-                window: winit_window,
-                gl_context,
-                gl_display,
-                gl_surface,
-            })
+        /// only applies for android. but we basically drop surface + window and make context not current
+        fn on_suspend(&mut self) -> Result<()> {
+            tracing::debug!("received suspend event. dropping window and surface");
+            self.gl_surface.take();
+            self.window.take();
+            if let Some(current) = self.current_gl_context.take() {
+                tracing::debug!("context is current, so making it non-current");
+                self.not_current_gl_context = Some(current.make_not_current()?);
+            } else {
+                tracing::debug!(
+                    "context is already not current??? could be duplicate suspend event"
+                );
+            }
+            Ok(())
         }
 
         fn window(&self) -> &winit::window::Window {
-            &self.window
+            self.window.as_ref().expect("winit window doesn't exist")
         }
 
         fn resize(&self, physical_size: winit::dpi::PhysicalSize<u32>) {
-            use glutin::surface::GlSurface;
             let width = std::num::NonZeroU32::new(physical_size.width.at_least(1)).unwrap();
             let height = std::num::NonZeroU32::new(physical_size.height.at_least(1)).unwrap();
-            self.gl_surface.resize(&self.gl_context, width, height);
+            self.gl_surface
+                .as_ref()
+                .expect("failed to get surface to resize")
+                .resize(
+                    self.current_gl_context
+                        .as_ref()
+                        .expect("failed to get current context to resize surface"),
+                    width,
+                    height,
+                );
         }
 
         fn swap_buffers(&self) -> glutin::error::Result<()> {
-            use glutin::surface::GlSurface;
-            self.gl_surface.swap_buffers(&self.gl_context)
+            self.gl_surface
+                .as_ref()
+                .expect("failed to get surface to swap buffers")
+                .swap_buffers(
+                    self.current_gl_context
+                        .as_ref()
+                        .expect("failed to get current context to swap buffers"),
+                )
         }
 
         fn get_proc_address(&self, addr: &std::ffi::CStr) -> *const std::ffi::c_void {
-            use glutin::display::GlDisplay;
-            self.gl_display.get_proc_address(addr)
+            self.gl_config.display().get_proc_address(addr)
         }
     }
 
@@ -515,12 +637,17 @@ mod glow_integration {
 
             let window_settings = epi_integration::load_window_settings(storage);
 
-            let winit_window =
-                epi_integration::window_builder(event_loop, title, native_options, window_settings)
-                    .build(event_loop)?;
-            // a lot of the code below has been lifted from glutin example in their repo.
-            let glutin_window_context =
-                unsafe { GlutinWindowContext::new(winit_window, native_options)? };
+            let winit_window_builder =
+                epi_integration::window_builder(event_loop, title, native_options, window_settings);
+            let mut glutin_window_context = unsafe {
+                GlutinWindowContext::new(winit_window_builder, native_options, event_loop)?
+            };
+            glutin_window_context.on_resume(event_loop)?;
+
+            if let Some(window) = &glutin_window_context.window {
+                epi_integration::apply_native_options_to_window(window, native_options);
+            }
+
             let gl = unsafe {
                 glow::Context::from_loader_function(|s| {
                     let s = std::ffi::CString::new(s)
@@ -749,26 +876,24 @@ mod glow_integration {
         ) -> Result<EventResult> {
             Ok(match event {
                 winit::event::Event::Resumed => {
+                    // first resume event.
+                    // we can actually move this outside of event loop.
+                    // and just run the on_resume fn of gl_window
                     if self.running.is_none() {
                         self.init_run_state(event_loop)?;
+                    } else {
+                        // not the first resume event. create whatever you need.
+                        self.running
+                            .as_mut()
+                            .unwrap()
+                            .gl_window
+                            .on_resume(event_loop)?;
                     }
                     EventResult::RepaintNow
                 }
                 winit::event::Event::Suspended => {
-                    #[cfg(target_os = "android")]
-                    {
-                        tracing::error!("Suspended app can't destroy Window surface state with current Egui Glow backend (undefined behaviour)");
-                        // Instead of destroying everything which we _know_ we can't re-create
-                        // we instead currently just try our luck with not destroying anything.
-                        //
-                        // When the application resumes then it will get a new `SurfaceView` but
-                        // we have no practical way currently of creating a new EGL surface
-                        // via the Glutin API while keeping the GL context and the rest of
-                        // our app state. This will likely result in a black screen or
-                        // frozen screen.
-                        //
-                        //self.running = None;
-                    }
+                    self.running.as_mut().unwrap().gl_window.on_suspend()?;
+
                     EventResult::Wait
                 }
 
@@ -863,22 +988,13 @@ mod glow_integration {
         app_creator: epi::AppCreator,
     ) -> Result<()> {
         if native_options.run_and_return {
-            with_event_loop(native_options, |event_loop, mut native_options| {
-                if native_options.centered {
-                    center_window_pos(event_loop.available_monitors().next(), &mut native_options);
-                }
-
+            with_event_loop(native_options, |event_loop, native_options| {
                 let glow_eframe =
                     GlowWinitApp::new(event_loop, app_name, native_options, app_creator);
                 run_and_return(event_loop, glow_eframe)
             })
         } else {
             let event_loop = create_event_loop_builder(&mut native_options).build();
-
-            if native_options.centered {
-                center_window_pos(event_loop.available_monitors().next(), &mut native_options);
-            }
-
             let glow_eframe = GlowWinitApp::new(&event_loop, app_name, native_options, app_creator);
             run_and_exit(event_loop, glow_eframe);
         }
@@ -946,19 +1062,20 @@ mod wgpu_integration {
             storage: Option<&dyn epi::Storage>,
             title: &str,
             native_options: &NativeOptions,
-        ) -> Result<winit::window::Window> {
+        ) -> std::result::Result<winit::window::Window, winit::error::OsError> {
             let window_settings = epi_integration::load_window_settings(storage);
-            Ok(
-                epi_integration::window_builder(event_loop, title, native_options, window_settings)
-                    .build(event_loop)?,
-            )
+            let window_builder =
+                epi_integration::window_builder(event_loop, title, native_options, window_settings);
+            let window = window_builder.build(event_loop)?;
+            epi_integration::apply_native_options_to_window(&window, native_options);
+            Ok(window)
         }
 
         #[allow(unsafe_code)]
         fn set_window(
             &mut self,
             window: winit::window::Window,
-        ) -> std::result::Result<(), wgpu::RequestDeviceError> {
+        ) -> std::result::Result<(), egui_wgpu::WgpuError> {
             self.window = Some(window);
             if let Some(running) = &mut self.running {
                 unsafe {
@@ -970,7 +1087,7 @@ mod wgpu_integration {
 
         #[allow(unsafe_code)]
         #[cfg(target_os = "android")]
-        fn drop_window(&mut self) -> std::result::Result<(), wgpu::RequestDeviceError> {
+        fn drop_window(&mut self) -> std::result::Result<(), egui_wgpu::WgpuError> {
             self.window = None;
             if let Some(running) = &mut self.running {
                 unsafe {
@@ -985,13 +1102,14 @@ mod wgpu_integration {
             event_loop: &EventLoopWindowTarget<UserEvent>,
             storage: Option<Box<dyn epi::Storage>>,
             window: winit::window::Window,
-        ) -> std::result::Result<(), wgpu::RequestDeviceError> {
+        ) -> std::result::Result<(), egui_wgpu::WgpuError> {
             #[allow(unsafe_code, unused_mut, unused_unsafe)]
             let painter = unsafe {
                 let mut painter = egui_wgpu::winit::Painter::new(
                     self.native_options.wgpu_options.clone(),
                     self.native_options.multisampling.max(1) as _,
                     self.native_options.depth_buffer,
+                    self.native_options.transparent,
                 );
                 pollster::block_on(painter.set_window(Some(&window)))?;
                 painter
@@ -1286,22 +1404,13 @@ mod wgpu_integration {
         app_creator: epi::AppCreator,
     ) -> Result<()> {
         if native_options.run_and_return {
-            with_event_loop(native_options, |event_loop, mut native_options| {
-                if native_options.centered {
-                    center_window_pos(event_loop.available_monitors().next(), &mut native_options);
-                }
-
+            with_event_loop(native_options, |event_loop, native_options| {
                 let wgpu_eframe =
                     WgpuWinitApp::new(event_loop, app_name, native_options, app_creator);
                 run_and_return(event_loop, wgpu_eframe)
             })
         } else {
             let event_loop = create_event_loop_builder(&mut native_options).build();
-
-            if native_options.centered {
-                center_window_pos(event_loop.available_monitors().next(), &mut native_options);
-            }
-
             let wgpu_eframe = WgpuWinitApp::new(&event_loop, app_name, native_options, app_creator);
             run_and_exit(event_loop, wgpu_eframe);
         }

crates/eframe/src/web/backend.rs

@@ -313,10 +313,11 @@ impl AppRunner {
 
     pub fn warm_up(&mut self) -> Result<(), JsValue> {
         if self.app.warm_up_enabled() {
-            let saved_memory: egui::Memory = self.egui_ctx.memory().clone();
-            self.egui_ctx.memory().set_everything_is_visible(true);
+            let saved_memory: egui::Memory = self.egui_ctx.memory(|m| m.clone());
+            self.egui_ctx
+                .memory_mut(|m| m.set_everything_is_visible(true));
             self.logic()?;
-            *self.egui_ctx.memory() = saved_memory; // We don't want to remember that windows were huge.
+            self.egui_ctx.memory_mut(|m| *m = saved_memory); // We don't want to remember that windows were huge.
             self.egui_ctx.clear_animations();
         }
         Ok(())
@@ -388,7 +389,7 @@ impl AppRunner {
     }
 
     fn handle_platform_output(&mut self, platform_output: egui::PlatformOutput) {
-        if self.egui_ctx.options().screen_reader {
+        if self.egui_ctx.options(|o| o.screen_reader) {
             self.screen_reader
                 .speak(&platform_output.events_description());
         }
@@ -449,8 +450,6 @@ pub enum EventToUnsubscribe {
 
 impl EventToUnsubscribe {
     pub fn unsubscribe(self) -> Result<(), JsValue> {
-        use wasm_bindgen::JsCast;
-
         match self {
             EventToUnsubscribe::TargetEvent(handle) => {
                 handle.target.remove_event_listener_with_callback(
@@ -467,6 +466,7 @@ impl EventToUnsubscribe {
         }
     }
 }
+
 pub struct AppRunnerContainer {
     pub runner: AppRunnerRef,
 
@@ -485,8 +485,6 @@ impl AppRunnerContainer {
         event_name: &'static str,
         mut closure: impl FnMut(E, MutexGuard<'_, AppRunner>) + 'static,
     ) -> Result<(), JsValue> {
-        use wasm_bindgen::JsCast;
-
         // Create a JS closure based on the FnMut provided
         let closure = Closure::wrap({
             // Clone atomics

crates/eframe/src/web/events.rs

@@ -1,6 +1,9 @@
-use super::*;
 use std::sync::atomic::{AtomicBool, Ordering};
 
+use egui::Key;
+
+use super::*;
+
 struct IsDestroyed(pub bool);
 
 pub fn paint_and_schedule(
@@ -28,7 +31,6 @@ pub fn paint_and_schedule(
         runner_ref: AppRunnerRef,
         panicked: Arc<AtomicBool>,
     ) -> Result<(), JsValue> {
-        use wasm_bindgen::JsCast;
         let window = web_sys::window().unwrap();
         let closure = Closure::once(move || paint_and_schedule(&runner_ref, panicked));
         window.request_animation_frame(closure.as_ref().unchecked_ref())?;
@@ -64,8 +66,9 @@ pub fn install_document_events(runner_container: &mut AppRunnerContainer) -> Res
             runner_lock.input.raw.modifiers = modifiers;
 
             let key = event.key();
+            let egui_key = translate_key(&key);
 
-            if let Some(key) = translate_key(&key) {
+            if let Some(key) = egui_key {
                 runner_lock.input.raw.events.push(egui::Event::Key {
                     key,
                     pressed: true,
@@ -85,10 +88,18 @@ pub fn install_document_events(runner_container: &mut AppRunnerContainer) -> Res
 
             let egui_wants_keyboard = runner_lock.egui_ctx().wants_keyboard_input();
 
-            let prevent_default = if matches!(event.key().as_str(), "Tab") {
+            #[allow(clippy::if_same_then_else)]
+            let prevent_default = if egui_key == Some(Key::Tab) {
                 // Always prevent moving cursor to url bar.
                 // egui wants to use tab to move to the next text field.
                 true
+            } else if egui_key == Some(Key::P) {
+                #[allow(clippy::needless_bool)]
+                if modifiers.ctrl || modifiers.command || modifiers.mac_cmd {
+                    true // Prevent ctrl-P opening the print dialog. Users may want to use it for a command palette.
+                } else {
+                    false // let normal P:s through
+                }
             } else if egui_wants_keyboard {
                 matches!(
                     event.key().as_str(),
@@ -112,6 +123,7 @@ pub fn install_document_events(runner_container: &mut AppRunnerContainer) -> Res
 
             if prevent_default {
                 event.prevent_default();
+                // event.stop_propagation();
             }
         },
     )?;
@@ -198,15 +210,21 @@ pub fn install_document_events(runner_container: &mut AppRunnerContainer) -> Res
 pub fn install_canvas_events(runner_container: &mut AppRunnerContainer) -> Result<(), JsValue> {
     let canvas = canvas_element(runner_container.runner.lock().canvas_id()).unwrap();
 
-    {
+    let prevent_default_events = [
         // By default, right-clicks open a context menu.
         // We don't want to do that (right clicks is handled by egui):
-        let event_name = "contextmenu";
+        "contextmenu",
+        // Allow users to use ctrl-p for e.g. a command palette
+        "afterprint",
+    ];
 
+    for event_name in prevent_default_events {
         let closure =
             move |event: web_sys::MouseEvent,
                   mut _runner_lock: egui::mutex::MutexGuard<'_, AppRunner>| {
                 event.prevent_default();
+                // event.stop_propagation();
+                // tracing::debug!("Preventing event {:?}", event_name);
             };
 
         runner_container.add_event_listener(&canvas, event_name, closure)?;
@@ -390,7 +408,7 @@ pub fn install_canvas_events(runner_container: &mut AppRunnerContainer) -> Resul
                 }
                 web_sys::WheelEvent::DOM_DELTA_LINE => {
                     #[allow(clippy::let_and_return)]
-                    let points_per_scroll_line = 8.0; // Note that this is intentionally different from what we use in egui_glium / winit.
+                    let points_per_scroll_line = 8.0; // Note that this is intentionally different from what we use in winit.
                     points_per_scroll_line
                 }
                 _ => 1.0, // DOM_DELTA_PIXEL

crates/eframe/src/web/mod.rs

@@ -83,7 +83,6 @@ pub fn system_theme() -> Option<Theme> {
 }
 
 pub fn canvas_element(canvas_id: &str) -> Option<web_sys::HtmlCanvasElement> {
-    use wasm_bindgen::JsCast;
     let document = web_sys::window()?.document()?;
     let canvas = document.get_element_by_id(canvas_id)?;
     canvas.dyn_into::<web_sys::HtmlCanvasElement>().ok()

crates/eframe/src/web/storage.rs

@@ -15,7 +15,7 @@ pub fn load_memory(ctx: &egui::Context) {
     if let Some(memory_string) = local_storage_get("egui_memory_ron") {
         match ron::from_str(&memory_string) {
             Ok(memory) => {
-                *ctx.memory() = memory;
+                ctx.memory_mut(|m| *m = memory);
             }
             Err(err) => {
                 tracing::error!("Failed to parse memory RON: {}", err);
@@ -29,7 +29,7 @@ pub fn load_memory(_: &egui::Context) {}
 
 #[cfg(feature = "persistence")]
 pub fn save_memory(ctx: &egui::Context) {
-    match ron::to_string(&*ctx.memory()) {
+    match ctx.memory(|mem| ron::to_string(mem)) {
         Ok(ron) => {
             local_storage_set("egui_memory_ron", &ron);
         }

crates/eframe/src/web/text_agent.rs

@@ -10,7 +10,6 @@ use wasm_bindgen::prelude::*;
 static AGENT_ID: &str = "egui_text_agent";
 
 pub fn text_agent() -> web_sys::HtmlInputElement {
-    use wasm_bindgen::JsCast;
     web_sys::window()
         .unwrap()
         .document()
@@ -23,7 +22,6 @@ pub fn text_agent() -> web_sys::HtmlInputElement {
 
 /// Text event handler,
 pub fn install_text_agent(runner_container: &mut AppRunnerContainer) -> Result<(), JsValue> {
-    use wasm_bindgen::JsCast;
     let window = web_sys::window().unwrap();
     let document = window.document().unwrap();
     let body = document.body().expect("document should have a body");
@@ -129,7 +127,6 @@ pub fn install_text_agent(runner_container: &mut AppRunnerContainer) -> Result<(
 
 /// Focus or blur text agent to toggle mobile keyboard.
 pub fn update_text_agent(runner: MutexGuard<'_, AppRunner>) -> Option<()> {
-    use wasm_bindgen::JsCast;
     use web_sys::HtmlInputElement;
     let window = web_sys::window()?;
     let document = window.document()?;

crates/eframe/src/web/web_painter.rs

@@ -1,4 +1,3 @@
-use egui::Rgba;
 use wasm_bindgen::JsValue;
 
 /// Renderer for a browser canvas.
@@ -19,7 +18,7 @@ pub(crate) trait WebPainter {
     /// Update all internal textures and paint gui.
     fn paint_and_update_textures(
         &mut self,
-        clear_color: Rgba,
+        clear_color: [f32; 4],
         clipped_primitives: &[egui::ClippedPrimitive],
         pixels_per_point: f32,
         textures_delta: &egui::TexturesDelta,

crates/eframe/src/web/web_painter_glow.rs

@@ -2,7 +2,6 @@ use wasm_bindgen::JsCast;
 use wasm_bindgen::JsValue;
 use web_sys::HtmlCanvasElement;
 
-use egui::Rgba;
 use egui_glow::glow;
 
 use crate::{WebGlContextOption, WebOptions};
@@ -49,7 +48,7 @@ impl WebPainter for WebPainterGlow {
 
     fn paint_and_update_textures(
         &mut self,
-        clear_color: Rgba,
+        clear_color: [f32; 4],
         clipped_primitives: &[egui::ClippedPrimitive],
         pixels_per_point: f32,
         textures_delta: &egui::TexturesDelta,

crates/eframe/src/web/web_painter_wgpu.rs

@@ -3,7 +3,7 @@ use std::sync::Arc;
 use wasm_bindgen::JsValue;
 use web_sys::HtmlCanvasElement;
 
-use egui::{mutex::RwLock, Rgba};
+use egui::mutex::RwLock;
 use egui_wgpu::{renderer::ScreenDescriptor, RenderState, SurfaceErrorAction};
 
 use crate::WebOptions;
@@ -49,6 +49,7 @@ impl WebPainterWgpu {
                     dimension: wgpu::TextureDimension::D2,
                     format: depth_format,
                     usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
+                    view_formats: &[depth_format],
                 })
                 .create_view(&wgpu::TextureViewDescriptor::default())
         })
@@ -60,8 +61,13 @@ impl WebPainterWgpu {
 
         let canvas = super::canvas_element_or_die(canvas_id);
 
-        let instance = wgpu::Instance::new(options.wgpu_options.backends);
-        let surface = instance.create_surface_from_canvas(&canvas);
+        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
+            backends: options.wgpu_options.backends,
+            dx12_shader_compiler: Default::default(),
+        });
+        let surface = instance
+            .create_surface_from_canvas(&canvas)
+            .map_err(|err| format!("failed to create wgpu surface: {err}"))?;
 
         let adapter = instance
             .request_adapter(&wgpu::RequestAdapterOptions {
@@ -81,7 +87,7 @@ impl WebPainterWgpu {
             .map_err(|err| format!("Failed to find wgpu device: {}", err))?;
 
         let target_format =
-            egui_wgpu::preferred_framebuffer_format(&surface.get_supported_formats(&adapter));
+            egui_wgpu::preferred_framebuffer_format(&surface.get_capabilities(&adapter).formats);
 
         let depth_format = options.wgpu_options.depth_format;
         let renderer = egui_wgpu::Renderer::new(&device, target_format, depth_format, 1);
@@ -99,6 +105,7 @@ impl WebPainterWgpu {
             height: 0,
             present_mode: options.wgpu_options.present_mode,
             alpha_mode: wgpu::CompositeAlphaMode::Auto,
+            view_formats: vec![target_format],
         };
 
         tracing::debug!("wgpu painter initialized.");
@@ -128,7 +135,7 @@ impl WebPainter for WebPainterWgpu {
 
     fn paint_and_update_textures(
         &mut self,
-        clear_color: Rgba,
+        clear_color: [f32; 4],
         clipped_primitives: &[egui::ClippedPrimitive],
         pixels_per_point: f32,
         textures_delta: &egui::TexturesDelta,
@@ -221,10 +228,10 @@ impl WebPainter for WebPainterWgpu {
                         resolve_target: None,
                         ops: wgpu::Operations {
                             load: wgpu::LoadOp::Clear(wgpu::Color {
-                                r: clear_color.r() as f64,
-                                g: clear_color.g() as f64,
-                                b: clear_color.b() as f64,
-                                a: clear_color.a() as f64,
+                                r: clear_color[0] as f64,
+                                g: clear_color[1] as f64,
+                                b: clear_color[2] as f64,
+                                a: clear_color[3] as f64,
                             }),
                             store: true,
                         },

crates/egui-wgpu/CHANGELOG.md

@@ -3,9 +3,14 @@ All notable changes to the `egui-wgpu` integration will be noted in this file.
 
 
 ## Unreleased
+
+
+## 0.21.0 - 2023-02-08
+* Update to `wgpu` 0.15 ([#2629](https://github.com/emilk/egui/pull/2629))
 * Return `Err` instead of panic if we can't find a device ([#2428](https://github.com/emilk/egui/pull/2428)).
 * `winit::Painter::set_window` is now `async` ([#2434](https://github.com/emilk/egui/pull/2434)).
 * `egui-wgpu` now only depends on `epaint` instead of the entire `egui` ([#2438](https://github.com/emilk/egui/pull/2438)).
+* `winit::Painter` now supports transparent backbuffer ([#2684](https://github.com/emilk/egui/pull/2684)).
 
 
 ## 0.20.0 - 2022-12-08 - web support

crates/egui-wgpu/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "egui-wgpu"
-version = "0.20.0"
+version = "0.21.0"
 description = "Bindings for using egui natively using the wgpu library"
 authors = [
   "Nils Hasenbanck <nils@hasenbanck.de>",
@@ -36,20 +36,20 @@ winit = ["dep:winit"]
 
 
 [dependencies]
-epaint = { version = "0.20.0", path = "../epaint", default-features = false, features = [
+epaint = { version = "0.21.0", path = "../epaint", default-features = false, features = [
   "bytemuck",
 ] }
 
 bytemuck = "1.7"
 tracing = { version = "0.1", default-features = false, features = ["std"] }
 type-map = "0.5.0"
-wgpu = "0.14"
+wgpu = "0.15.0"
 
 #! ### Optional dependencies
 ## Enable this when generating docs.
 document-features = { version = "0.2", optional = true }
 
-winit = { version = "0.27.2", optional = true }
+winit = { version = "0.28", optional = true }
 
 # Native:
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]

crates/egui-wgpu/src/lib.rs

@@ -99,7 +99,39 @@ pub fn preferred_framebuffer_format(formats: &[wgpu::TextureFormat]) -> wgpu::Te
     }
     formats[0] // take the first
 }
+// maybe use this-error?
+#[derive(Debug)]
+pub enum WgpuError {
+    DeviceError(wgpu::RequestDeviceError),
+    SurfaceError(wgpu::CreateSurfaceError),
+}
 
+impl std::fmt::Display for WgpuError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Debug::fmt(self, f)
+    }
+}
+
+impl std::error::Error for WgpuError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            WgpuError::DeviceError(e) => e.source(),
+            WgpuError::SurfaceError(e) => e.source(),
+        }
+    }
+}
+
+impl From<wgpu::RequestDeviceError> for WgpuError {
+    fn from(e: wgpu::RequestDeviceError) -> Self {
+        Self::DeviceError(e)
+    }
+}
+
+impl From<wgpu::CreateSurfaceError> for WgpuError {
+    fn from(e: wgpu::CreateSurfaceError) -> Self {
+        Self::SurfaceError(e)
+    }
+}
 // ---------------------------------------------------------------------------
 
 /// Profiling macro for feature "puffin"

crates/egui-wgpu/src/renderer.rs

@@ -554,6 +554,7 @@ impl Renderer {
                 dimension: wgpu::TextureDimension::D2,
                 format: wgpu::TextureFormat::Rgba8UnormSrgb, // Minspec for wgpu WebGL emulation is WebGL2, so this should always be supported.
                 usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
+                view_formats: &[wgpu::TextureFormat::Rgba8UnormSrgb],
             });
             let sampler = self
                 .samplers

crates/egui-wgpu/src/winit.rs

@@ -1,14 +1,14 @@
 use std::sync::Arc;
 
-use tracing::error;
-use wgpu::{Adapter, Instance, Surface};
-
 use epaint::mutex::RwLock;
 
+use tracing::error;
+
 use crate::{renderer, RenderState, Renderer, SurfaceErrorAction, WgpuConfiguration};
 
 struct SurfaceState {
-    surface: Surface,
+    surface: wgpu::Surface,
+    alpha_mode: wgpu::CompositeAlphaMode,
     width: u32,
     height: u32,
 }
@@ -19,11 +19,12 @@ struct SurfaceState {
 pub struct Painter {
     configuration: WgpuConfiguration,
     msaa_samples: u32,
+    support_transparent_backbuffer: bool,
     depth_format: Option<wgpu::TextureFormat>,
     depth_texture_view: Option<wgpu::TextureView>,
 
-    instance: Instance,
-    adapter: Option<Adapter>,
+    instance: wgpu::Instance,
+    adapter: Option<wgpu::Adapter>,
     render_state: Option<RenderState>,
     surface_state: Option<SurfaceState>,
 }
@@ -41,12 +42,21 @@ impl Painter {
     /// [`set_window()`](Self::set_window) once you have
     /// a [`winit::window::Window`] with a valid `.raw_window_handle()`
     /// associated.
-    pub fn new(configuration: WgpuConfiguration, msaa_samples: u32, depth_bits: u8) -> Self {
-        let instance = wgpu::Instance::new(configuration.backends);
+    pub fn new(
+        configuration: WgpuConfiguration,
+        msaa_samples: u32,
+        depth_bits: u8,
+        support_transparent_backbuffer: bool,
+    ) -> Self {
+        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
+            backends: configuration.backends,
+            dx12_shader_compiler: Default::default(), //
+        });
 
         Self {
             configuration,
             msaa_samples,
+            support_transparent_backbuffer,
             depth_format: (depth_bits > 0).then_some(wgpu::TextureFormat::Depth32Float),
             depth_texture_view: None,
 
@@ -66,7 +76,7 @@ impl Painter {
 
     async fn init_render_state(
         &self,
-        adapter: &Adapter,
+        adapter: &wgpu::Adapter,
         target_format: wgpu::TextureFormat,
     ) -> Result<RenderState, wgpu::RequestDeviceError> {
         adapter
@@ -91,7 +101,7 @@ impl Painter {
     // will have the same format and so this render state will remain valid.
     async fn ensure_render_state_for_surface(
         &mut self,
-        surface: &Surface,
+        surface: &wgpu::Surface,
     ) -> Result<(), wgpu::RequestDeviceError> {
         if self.adapter.is_none() {
             self.adapter = self
@@ -107,7 +117,7 @@ impl Painter {
             match &self.adapter {
                 Some(adapter) => {
                     let swapchain_format = crate::preferred_framebuffer_format(
-                        &surface.get_supported_formats(adapter),
+                        &surface.get_capabilities(adapter).formats,
                     );
                     let rs = self.init_render_state(adapter, swapchain_format).await?;
                     self.render_state = Some(rs);
@@ -118,33 +128,23 @@ impl Painter {
         Ok(())
     }
 
-    fn configure_surface(&mut self, width_in_pixels: u32, height_in_pixels: u32) {
-        crate::profile_function!();
-
-        let render_state = self
-            .render_state
-            .as_ref()
-            .expect("Render state should exist before surface configuration");
-        let format = render_state.target_format;
-
-        let config = wgpu::SurfaceConfiguration {
-            usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
-            format,
-            width: width_in_pixels,
-            height: height_in_pixels,
-            present_mode: self.configuration.present_mode,
-            alpha_mode: wgpu::CompositeAlphaMode::Auto,
-        };
-
-        let surface_state = self
-            .surface_state
-            .as_mut()
-            .expect("Surface state should exist before surface configuration");
-        surface_state
-            .surface
-            .configure(&render_state.device, &config);
-        surface_state.width = width_in_pixels;
-        surface_state.height = height_in_pixels;
+    fn configure_surface(
+        surface_state: &SurfaceState,
+        render_state: &RenderState,
+        present_mode: wgpu::PresentMode,
+    ) {
+        surface_state.surface.configure(
+            &render_state.device,
+            &wgpu::SurfaceConfiguration {
+                usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
+                format: render_state.target_format,
+                width: surface_state.width,
+                height: surface_state.height,
+                present_mode,
+                alpha_mode: surface_state.alpha_mode,
+                view_formats: vec![render_state.target_format],
+            },
+        );
     }
 
     /// Updates (or clears) the [`winit::window::Window`] associated with the [`Painter`]
@@ -177,22 +177,41 @@ impl Painter {
     pub async unsafe fn set_window(
         &mut self,
         window: Option<&winit::window::Window>,
-    ) -> Result<(), wgpu::RequestDeviceError> {
+    ) -> Result<(), crate::WgpuError> {
         match window {
             Some(window) => {
-                let surface = self.instance.create_surface(&window);
+                let surface = self.instance.create_surface(&window)?;
 
                 self.ensure_render_state_for_surface(&surface).await?;
 
+                let alpha_mode = if self.support_transparent_backbuffer {
+                    let supported_alpha_modes = surface
+                        .get_capabilities(self.adapter.as_ref().unwrap())
+                        .alpha_modes;
+
+                    // Prefer pre multiplied over post multiplied!
+                    if supported_alpha_modes.contains(&wgpu::CompositeAlphaMode::PreMultiplied) {
+                        wgpu::CompositeAlphaMode::PreMultiplied
+                    } else if supported_alpha_modes
+                        .contains(&wgpu::CompositeAlphaMode::PostMultiplied)
+                    {
+                        wgpu::CompositeAlphaMode::PostMultiplied
+                    } else {
+                        tracing::warn!("Transparent window was requested, but the active wgpu surface does not support a `CompositeAlphaMode` with transparency.");
+                        wgpu::CompositeAlphaMode::Auto
+                    }
+                } else {
+                    wgpu::CompositeAlphaMode::Auto
+                };
+
                 let size = window.inner_size();
-                let width = size.width;
-                let height = size.height;
                 self.surface_state = Some(SurfaceState {
                     surface,
-                    width,
-                    height,
+                    width: size.width,
+                    height: size.height,
+                    alpha_mode,
                 });
-                self.resize_and_generate_depth_texture_view(width, height);
+                self.resize_and_generate_depth_texture_view(size.width, size.height);
             }
             None => {
                 self.surface_state = None;
@@ -217,10 +236,17 @@ impl Painter {
         width_in_pixels: u32,
         height_in_pixels: u32,
     ) {
-        self.configure_surface(width_in_pixels, height_in_pixels);
-        let device = &self.render_state.as_ref().unwrap().device;
+        let render_state = self.render_state.as_ref().unwrap();
+        let surface_state = self.surface_state.as_mut().unwrap();
+
+        surface_state.width = width_in_pixels;
+        surface_state.height = height_in_pixels;
+
+        Self::configure_surface(surface_state, render_state, self.configuration.present_mode);
+
         self.depth_texture_view = self.depth_format.map(|depth_format| {
-            device
+            render_state
+                .device
                 .create_texture(&wgpu::TextureDescriptor {
                     label: Some("egui_depth_texture"),
                     size: wgpu::Extent3d {
@@ -234,6 +260,7 @@ impl Painter {
                     format: depth_format,
                     usage: wgpu::TextureUsages::RENDER_ATTACHMENT
                         | wgpu::TextureUsages::TEXTURE_BINDING,
+                    view_formats: &[depth_format],
                 })
                 .create_view(&wgpu::TextureViewDescriptor::default())
         });
@@ -250,7 +277,7 @@ impl Painter {
     pub fn paint_and_update_textures(
         &mut self,
         pixels_per_point: f32,
-        clear_color: epaint::Rgba,
+        clear_color: [f32; 4],
         clipped_primitives: &[epaint::ClippedPrimitive],
         textures_delta: &epaint::textures::TexturesDelta,
     ) {
@@ -264,7 +291,6 @@ impl Painter {
             Some(rs) => rs,
             None => return,
         };
-        let (width, height) = (surface_state.width, surface_state.height);
 
         let output_frame = {
             crate::profile_scope!("get_current_texture");
@@ -277,7 +303,11 @@ impl Painter {
             #[allow(clippy::single_match_else)]
             Err(e) => match (*self.configuration.on_surface_error)(e) {
                 SurfaceErrorAction::RecreateSurface => {
-                    self.configure_surface(width, height);
+                    Self::configure_surface(
+                        surface_state,
+                        render_state,
+                        self.configuration.present_mode,
+                    );
                     return;
                 }
                 SurfaceErrorAction::SkipFrame => {
@@ -295,7 +325,7 @@ impl Painter {
 
         // Upload all resources for the GPU.
         let screen_descriptor = renderer::ScreenDescriptor {
-            size_in_pixels: [width, height],
+            size_in_pixels: [surface_state.width, surface_state.height],
             pixels_per_point,
         };
 
@@ -330,10 +360,10 @@ impl Painter {
                     resolve_target: None,
                     ops: wgpu::Operations {
                         load: wgpu::LoadOp::Clear(wgpu::Color {
-                            r: clear_color.r() as f64,
-                            g: clear_color.g() as f64,
-                            b: clear_color.b() as f64,
-                            a: clear_color.a() as f64,
+                            r: clear_color[0] as f64,
+                            g: clear_color[1] as f64,
+                            b: clear_color[2] as f64,
+                            a: clear_color[3] as f64,
                         }),
                         store: true,
                     },

crates/egui-winit/CHANGELOG.md

@@ -5,8 +5,19 @@ All notable changes to the `egui-winit` integration will be noted in this file.
 ## Unreleased
 
 
+## 0.21.1 - 2023-02-12
+* Fixed crash when window position is in an invalid state, which could happen e.g. due to changes in monitor size or DPI ([#2722](https://github.com/emilk/egui/issues/2722)).
+
+
+## 0.21.0 - 2023-02-08
+* Fixed persistence of native window position on Windows OS ([#2583](https://github.com/emilk/egui/issues/2583)).
+* Update to `winit` 0.28, adding support for mac trackpad zoom ([#2654](https://github.com/emilk/egui/pull/2654)).
+* Remove the `screen_reader` feature. Use the `accesskit` feature flag instead ([#2669](https://github.com/emilk/egui/pull/2669)).
+* Fix bug where the cursor could get stuck using the wrong icon.
+
+
 ## 0.20.1 - 2022-12-11
-* Fix docs.rs build ([#2420](https://github.com/emilk/egui/pull/2420)).
+* Fix [docs.rs](https://docs.rs/egui-winit) build ([#2420](https://github.com/emilk/egui/pull/2420)).
 
 
 ## 0.20.0 - 2022-12-08

crates/egui-winit/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "egui-winit"
-version = "0.20.1"
+version = "0.21.1"
 authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
 description = "Bindings for using egui with winit"
 edition = "2021"
@@ -14,8 +14,7 @@ keywords = ["winit", "egui", "gui", "gamedev"]
 include = ["../LICENSE-APACHE", "../LICENSE-MIT", "**/*.rs", "Cargo.toml"]
 
 [package.metadata.docs.rs]
-# Avoid speech-dispatcher dependencies - see https://docs.rs/crate/egui-winit/0.20.0/builds/695196
-features = ["document-features"]
+all-features = true
 
 
 [features]
@@ -37,9 +36,6 @@ links = ["webbrowser"]
 ## Enable profiling with the [`puffin`](https://docs.rs/puffin) crate.
 puffin = ["dep:puffin"]
 
-## Experimental support for a screen reader.
-screen_reader = ["tts"]
-
 ## Allow serialization of [`WindowSettings`] using [`serde`](https://docs.rs/serde).
 serde = ["egui/serde", "dep:serde"]
 
@@ -47,33 +43,34 @@ serde = ["egui/serde", "dep:serde"]
 wayland = ["winit/wayland"]
 
 [dependencies]
-egui = { version = "0.20.0", path = "../egui", default-features = false, features = [
+egui = { version = "0.21.0", path = "../egui", default-features = false, features = [
   "tracing",
 ] }
 instant = { version = "0.1", features = [
   "wasm-bindgen",
 ] } # We use instant so we can (maybe) compile for web
 tracing = { version = "0.1", default-features = false, features = ["std"] }
-winit = { version = "0.27.2", default-features = false }
+winit = { version = "0.28", default-features = false }
 
 #! ### Optional dependencies
 
+# feature accesskit
+accesskit_winit = { version = "0.10.0", optional = true }
+
 ## Enable this when generating docs.
 document-features = { version = "0.2", optional = true }
 
-# feature accesskit
-accesskit_winit = { version = "0.7.1", optional = true }
-
 puffin = { version = "0.14", optional = true }
 serde = { version = "1.0", optional = true, features = ["derive"] }
 
-# feature screen_reader
-tts = { version = "0.24", optional = true }
-
-webbrowser = { version = "0.8", optional = true }
+webbrowser = { version = "0.8.3", optional = true }
 
 [target.'cfg(any(target_os="linux", target_os="dragonfly", target_os="freebsd", target_os="netbsd", target_os="openbsd"))'.dependencies]
 smithay-clipboard = { version = "0.6.3", optional = true }
 
 [target.'cfg(not(target_os = "android"))'.dependencies]
 arboard = { version = "3.2", optional = true, default-features = false }
+
+[target.'cfg(target_os = "android")'.dependencies]
+# TODO(emilk): this is probably not the right place for specifying native-activity, but we need to do it somewhere for the CI
+android-activity = { version = "0.4", features = ["native-activity"] }

crates/egui-winit/src/lib.rs

@@ -19,23 +19,12 @@ use egui::accesskit;
 pub use winit;
 
 pub mod clipboard;
-pub mod screen_reader;
 mod window_settings;
 
 pub use window_settings::WindowSettings;
 
 use winit::event_loop::EventLoopWindowTarget;
 
-#[cfg(feature = "wayland")]
-#[cfg(any(
-    target_os = "linux",
-    target_os = "dragonfly",
-    target_os = "freebsd",
-    target_os = "netbsd",
-    target_os = "openbsd"
-))]
-use winit::platform::unix::EventLoopWindowTargetExtUnix;
-
 pub fn native_pixels_per_point(window: &winit::window::Window) -> f32 {
     window.scale_factor() as f32
 }
@@ -70,12 +59,12 @@ pub struct State {
     egui_input: egui::RawInput,
     pointer_pos_in_points: Option<egui::Pos2>,
     any_pointer_button_down: bool,
-    current_cursor_icon: egui::CursorIcon,
+    current_cursor_icon: Option<egui::CursorIcon>,
+
     /// What egui uses.
     current_pixels_per_point: f32,
 
     clipboard: clipboard::Clipboard,
-    screen_reader: screen_reader::ScreenReader,
 
     /// If `true`, mouse inputs will be treated as touches.
     /// Useful for debugging touch support in egui.
@@ -111,11 +100,10 @@ impl State {
             egui_input,
             pointer_pos_in_points: None,
             any_pointer_button_down: false,
-            current_cursor_icon: egui::CursorIcon::Default,
+            current_cursor_icon: None,
             current_pixels_per_point: 1.0,
 
             clipboard: clipboard::Clipboard::new(wayland_display),
-            screen_reader: screen_reader::ScreenReader::default(),
 
             simulate_touch_screen: false,
             pointer_touch_id: None,
@@ -380,8 +368,9 @@ impl State {
                     consumed: false,
                 }
             }
-            WindowEvent::AxisMotion { .. }
-            | WindowEvent::CloseRequested
+
+            // Things that may require repaint:
+            WindowEvent::CloseRequested
             | WindowEvent::CursorEntered { .. }
             | WindowEvent::Destroyed
             | WindowEvent::Occluded(_)
@@ -391,10 +380,26 @@ impl State {
                 repaint: true,
                 consumed: false,
             },
-            WindowEvent::Moved(_) => EventResponse {
-                repaint: false, // moving a window doesn't warrant a repaint
+
+            // Things we completely ignore:
+            WindowEvent::AxisMotion { .. }
+            | WindowEvent::Moved(_)
+            | WindowEvent::SmartMagnify { .. }
+            | WindowEvent::TouchpadRotate { .. } => EventResponse {
+                repaint: false,
                 consumed: false,
             },
+
+            WindowEvent::TouchpadMagnify { delta, .. } => {
+                // Positive delta values indicate magnification (zooming in).
+                // Negative delta values indicate shrinking (zooming out).
+                let zoom_factor = (*delta as f32).exp();
+                self.egui_input.events.push(egui::Event::Zoom(zoom_factor));
+                EventResponse {
+                    repaint: true,
+                    consumed: egui_ctx.wants_pointer_input(),
+                }
+            }
         }
     }
 
@@ -615,11 +620,6 @@ impl State {
         egui_ctx: &egui::Context,
         platform_output: egui::PlatformOutput,
     ) {
-        if egui_ctx.options().screen_reader {
-            self.screen_reader
-                .speak(&platform_output.events_description());
-        }
-
         let egui::PlatformOutput {
             cursor_icon,
             open_url,
@@ -655,22 +655,25 @@ impl State {
     }
 
     fn set_cursor_icon(&mut self, window: &winit::window::Window, cursor_icon: egui::CursorIcon) {
-        // Prevent flickering near frame boundary when Windows OS tries to control cursor icon for window resizing.
-        // On other platforms: just early-out to save CPU.
-        if self.current_cursor_icon == cursor_icon {
+        if self.current_cursor_icon == Some(cursor_icon) {
+            // Prevent flickering near frame boundary when Windows OS tries to control cursor icon for window resizing.
+            // On other platforms: just early-out to save CPU.
             return;
         }
-        self.current_cursor_icon = cursor_icon;
 
-        if let Some(cursor_icon) = translate_cursor(cursor_icon) {
-            window.set_cursor_visible(true);
+        let is_pointer_in_window = self.pointer_pos_in_points.is_some();
+        if is_pointer_in_window {
+            self.current_cursor_icon = Some(cursor_icon);
 
-            let is_pointer_in_window = self.pointer_pos_in_points.is_some();
-            if is_pointer_in_window {
-                window.set_cursor_icon(cursor_icon);
+            if let Some(winit_cursor_icon) = translate_cursor(cursor_icon) {
+                window.set_cursor_visible(true);
+                window.set_cursor_icon(winit_cursor_icon);
+            } else {
+                window.set_cursor_visible(false);
             }
         } else {
-            window.set_cursor_visible(false);
+            // Remember to set the cursor again once the cursor returns to the screen:
+            self.current_cursor_icon = None;
         }
     }
 }
@@ -879,6 +882,7 @@ fn wayland_display<T>(_event_loop: &EventLoopWindowTarget<T>) -> Option<*mut c_v
         target_os = "openbsd"
     ))]
     {
+        use winit::platform::wayland::EventLoopWindowTargetExtWayland as _;
         return _event_loop.wayland_display();
     }
 

crates/egui-winit/src/screen_reader.rs

@@ -1,49 +0,0 @@
-pub struct ScreenReader {
-    #[cfg(feature = "tts")]
-    tts: Option<tts::Tts>,
-}
-
-#[cfg(not(feature = "tts"))]
-#[allow(clippy::derivable_impls)] // False positive
-impl Default for ScreenReader {
-    fn default() -> Self {
-        Self {}
-    }
-}
-
-#[cfg(feature = "tts")]
-impl Default for ScreenReader {
-    fn default() -> Self {
-        let tts = match tts::Tts::default() {
-            Ok(screen_reader) => {
-                tracing::debug!("Initialized screen reader.");
-                Some(screen_reader)
-            }
-            Err(err) => {
-                tracing::warn!("Failed to load screen reader: {}", err);
-                None
-            }
-        };
-        Self { tts }
-    }
-}
-
-impl ScreenReader {
-    #[cfg(not(feature = "tts"))]
-    #[allow(clippy::unused_self)]
-    pub fn speak(&mut self, _text: &str) {}
-
-    #[cfg(feature = "tts")]
-    pub fn speak(&mut self, text: &str) {
-        if text.is_empty() {
-            return;
-        }
-        if let Some(tts) = &mut self.tts {
-            tracing::debug!("Speaking: {:?}", text);
-            let interrupt = true;
-            if let Err(err) = tts.speak(text, interrupt) {
-                tracing::warn!("Failed to read: {}", err);
-            }
-        }
-    }
-}

crates/egui-winit/src/window_settings.rs

@@ -42,6 +42,10 @@ impl WindowSettings {
         }
     }
 
+    pub fn inner_size_points(&self) -> Option<egui::Vec2> {
+        self.inner_size_points
+    }
+
     pub fn initialize_window(
         &self,
         mut window: winit::window::WindowBuilder,
@@ -49,16 +53,13 @@ impl WindowSettings {
         // If the app last ran on two monitors and only one is now connected, then
         // the given position is invalid.
         // If this happens on Mac, the window is clamped into valid area.
-        // If this happens on Windows, the window is hidden and very difficult to find.
-        // So we don't restore window positions on Windows.
-        let try_restore_position = !cfg!(target_os = "windows");
-        if try_restore_position {
-            if let Some(pos) = self.position {
-                window = window.with_position(winit::dpi::PhysicalPosition {
-                    x: pos.x as f64,
-                    y: pos.y as f64,
-                });
-            }
+        // If this happens on Windows, the clamping behavior is managed by the function
+        // clamp_window_to_sane_position.
+        if let Some(pos) = self.position {
+            window = window.with_position(winit::dpi::PhysicalPosition {
+                x: pos.x as f64,
+                y: pos.y as f64,
+            });
         }
 
         if let Some(inner_size_points) = self.inner_size_points {
@@ -86,4 +87,58 @@ impl WindowSettings {
             *size = size.at_most(max_size);
         }
     }
+
+    pub fn clamp_window_to_sane_position<E>(
+        &mut self,
+        event_loop: &winit::event_loop::EventLoopWindowTarget<E>,
+    ) {
+        if let (Some(position), Some(inner_size_points)) =
+            (&mut self.position, &self.inner_size_points)
+        {
+            let monitors = event_loop.available_monitors();
+            // default to primary monitor, in case the correct monitor was disconnected.
+            let mut active_monitor = if let Some(active_monitor) = event_loop
+                .primary_monitor()
+                .or_else(|| event_loop.available_monitors().next())
+            {
+                active_monitor
+            } else {
+                return; // no monitors 🤷
+            };
+            for monitor in monitors {
+                let monitor_x_range = (monitor.position().x - inner_size_points.x as i32)
+                    ..(monitor.position().x + monitor.size().width as i32);
+                let monitor_y_range = (monitor.position().y - inner_size_points.y as i32)
+                    ..(monitor.position().y + monitor.size().height as i32);
+
+                if monitor_x_range.contains(&(position.x as i32))
+                    && monitor_y_range.contains(&(position.y as i32))
+                {
+                    active_monitor = monitor;
+                }
+            }
+
+            let mut inner_size_pixels = *inner_size_points * (active_monitor.scale_factor() as f32);
+            // Add size of title bar. This is 32 px by default in Win 10/11.
+            if cfg!(target_os = "windows") {
+                inner_size_pixels +=
+                    egui::Vec2::new(0.0, 32.0 * active_monitor.scale_factor() as f32);
+            }
+            let monitor_position = egui::Pos2::new(
+                active_monitor.position().x as f32,
+                active_monitor.position().y as f32,
+            );
+            let monitor_size = egui::Vec2::new(
+                active_monitor.size().width as f32,
+                active_monitor.size().height as f32,
+            );
+
+            // Window size cannot be negative or the subsequent `clamp` will panic.
+            let window_size = (monitor_size - inner_size_pixels).max(egui::Vec2::ZERO);
+            // To get the maximum position, we get the rightmost corner of the display, then
+            // subtract the size of the window to get the bottom right most value window.position
+            // can have.
+            *position = position.clamp(monitor_position, monitor_position + window_size);
+        }
+    }
 }

crates/egui/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "egui"
-version = "0.20.1"
+version = "0.21.0"
 authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
 description = "An easy-to-use immediate mode GUI that runs on both web and native"
 edition = "2021"
@@ -54,8 +54,12 @@ persistence = ["serde", "epaint/serde", "ron"]
 ## Allow serialization using [`serde`](https://docs.rs/serde).
 serde = ["dep:serde", "epaint/serde", "accesskit?/serde"]
 
+## Change Vertex layout to be compatible with unity
+unity = ["epaint/unity"]
+
+
 [dependencies]
-epaint = { version = "0.20.0", path = "../epaint", default-features = false }
+epaint = { version = "0.21.0", path = "../epaint", default-features = false }
 
 ahash = { version = "0.8.1", default-features = false, features = [
     "no-rng", # we don't need DOS-protection, so we let users opt-in to it instead
@@ -66,7 +70,7 @@ nohash-hasher = "0.2"
 #! ### Optional dependencies
 ## Exposes detailed accessibility implementation required by platform
 ## accessibility APIs. Also requires support in the egui integration.
-accesskit = { version = "0.8.1", optional = true }
+accesskit = { version = "0.9.0", optional = true }
 
 ## Enable this when generating docs.
 document-features = { version = "0.2", optional = true }

crates/egui/src/animation_manager.rs

@@ -9,6 +9,7 @@ pub(crate) struct AnimationManager {
 #[derive(Clone, Debug)]
 struct BoolAnim {
     value: bool,
+
     /// when did `value` last toggle?
     toggle_time: f64,
 }
@@ -16,7 +17,9 @@ struct BoolAnim {
 #[derive(Clone, Debug)]
 struct ValueAnim {
     from_value: f32,
+
     to_value: f32,
+
     /// when did `value` last toggle?
     toggle_time: f64,
 }

crates/egui/src/containers/area.rs

@@ -5,12 +5,14 @@
 use crate::*;
 
 /// State that is persisted between frames.
-// TODO(emilk): this is not currently stored in `memory().data`, but maybe it should be?
+// TODO(emilk): this is not currently stored in `Memory::data`, but maybe it should be?
 #[derive(Clone, Copy, Debug)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 pub(crate) struct State {
-    /// Last known pos
-    pub pos: Pos2,
+    /// Last known pos of the pivot
+    pub pivot_pos: Pos2,
+
+    pub pivot: Align2,
 
     /// Last know size. Used for catching clicks.
     pub size: Vec2,
@@ -21,8 +23,22 @@ pub(crate) struct State {
 }
 
 impl State {
+    pub fn left_top_pos(&self) -> Pos2 {
+        pos2(
+            self.pivot_pos.x - self.pivot.x().to_factor() * self.size.x,
+            self.pivot_pos.y - self.pivot.y().to_factor() * self.size.y,
+        )
+    }
+
+    pub fn set_left_top_pos(&mut self, pos: Pos2) {
+        self.pivot_pos = pos2(
+            pos.x + self.pivot.x().to_factor() * self.size.x,
+            pos.y + self.pivot.y().to_factor() * self.size.y,
+        );
+    }
+
     pub fn rect(&self) -> Rect {
-        Rect::from_min_size(self.pos, self.size)
+        Rect::from_min_size(self.left_top_pos(), self.size)
     }
 }
 
@@ -231,27 +247,25 @@ impl Area {
 
         let layer_id = LayerId::new(order, id);
 
-        let state = ctx.memory().areas.get(id).copied();
+        let state = ctx.memory(|mem| mem.areas.get(id).copied());
         let is_new = state.is_none();
         if is_new {
             ctx.request_repaint(); // if we don't know the previous size we are likely drawing the area in the wrong place
         }
         let mut state = state.unwrap_or_else(|| State {
-            pos: default_pos.unwrap_or_else(|| automatic_area_position(ctx)),
+            pivot_pos: default_pos.unwrap_or_else(|| automatic_area_position(ctx)),
+            pivot,
             size: Vec2::ZERO,
             interactable,
         });
-        state.pos = new_pos.unwrap_or(state.pos);
+        state.pivot_pos = new_pos.unwrap_or(state.pivot_pos);
         state.interactable = interactable;
 
-        if pivot != Align2::LEFT_TOP {
-            state.pos.x -= pivot.x().to_factor() * state.size.x;
-            state.pos.y -= pivot.y().to_factor() * state.size.y;
-        }
-
         if let Some((anchor, offset)) = anchor {
             let screen = ctx.available_rect();
-            state.pos = anchor.align_size_within_rect(state.size, screen).min + offset;
+            state.set_left_top_pos(
+                anchor.align_size_within_rect(state.size, screen).left_top() + offset,
+            );
         }
 
         // interact right away to prevent frame-delay
@@ -278,31 +292,33 @@ impl Area {
             // Important check - don't try to move e.g. a combobox popup!
             if movable {
                 if move_response.dragged() {
-                    state.pos += ctx.input().pointer.delta();
+                    state.pivot_pos += ctx.input(|i| i.pointer.delta());
                 }
 
-                state.pos = ctx
-                    .constrain_window_rect_to_area(state.rect(), drag_bounds)
-                    .min;
+                state.set_left_top_pos(
+                    ctx.constrain_window_rect_to_area(state.rect(), drag_bounds)
+                        .min,
+                );
             }
 
             if (move_response.dragged() || move_response.clicked())
                 || pointer_pressed_on_area(ctx, layer_id)
-                || !ctx.memory().areas.visible_last_frame(&layer_id)
+                || !ctx.memory(|m| m.areas.visible_last_frame(&layer_id))
             {
-                ctx.memory().areas.move_to_top(layer_id);
+                ctx.memory_mut(|m| m.areas.move_to_top(layer_id));
                 ctx.request_repaint();
             }
 
             move_response
         };
 
-        state.pos = ctx.round_pos_to_pixels(state.pos);
+        state.set_left_top_pos(ctx.round_pos_to_pixels(state.left_top_pos()));
 
         if constrain {
-            state.pos = ctx
-                .constrain_window_rect_to_area(state.rect(), drag_bounds)
-                .min;
+            state.set_left_top_pos(
+                ctx.constrain_window_rect_to_area(state.rect(), drag_bounds)
+                    .left_top(),
+            );
         }
 
         Prepared {
@@ -329,7 +345,7 @@ impl Area {
         }
 
         let layer_id = LayerId::new(self.order, self.id);
-        let area_rect = ctx.memory().areas.get(self.id).map(|area| area.rect());
+        let area_rect = ctx.memory(|mem| mem.areas.get(self.id).map(|area| area.rect()));
         if let Some(area_rect) = area_rect {
             let clip_rect = ctx.available_rect();
             let painter = Painter::new(ctx.clone(), layer_id, clip_rect);
@@ -358,7 +374,7 @@ impl Prepared {
     }
 
     pub(crate) fn content_ui(&self, ctx: &Context) -> Ui {
-        let screen_rect = ctx.input().screen_rect();
+        let screen_rect = ctx.screen_rect();
 
         let bounds = if let Some(bounds) = self.drag_bounds {
             bounds.intersect(screen_rect) // protect against infinite bounds
@@ -374,14 +390,16 @@ impl Prepared {
         };
 
         let max_rect = Rect::from_min_max(
-            self.state.pos,
-            bounds.max.at_least(self.state.pos + Vec2::splat(32.0)),
+            self.state.left_top_pos(),
+            bounds
+                .max
+                .at_least(self.state.left_top_pos() + Vec2::splat(32.0)),
         );
 
         let shadow_radius = ctx.style().visuals.window_shadow.extrusion; // hacky
         let clip_rect_margin = ctx.style().visuals.clip_rect_margin.max(shadow_radius);
 
-        let clip_rect = Rect::from_min_max(self.state.pos, bounds.max)
+        let clip_rect = Rect::from_min_max(self.state.left_top_pos(), bounds.max)
             .expand(clip_rect_margin)
             .intersect(bounds);
 
@@ -410,7 +428,7 @@ impl Prepared {
 
         state.size = content_ui.min_rect().size();
 
-        ctx.memory().areas.set_state(layer_id, state);
+        ctx.memory_mut(|m| m.areas.set_state(layer_id, state));
 
         move_response
     }
@@ -418,7 +436,7 @@ impl Prepared {
 
 fn pointer_pressed_on_area(ctx: &Context, layer_id: LayerId) -> bool {
     if let Some(pointer_pos) = ctx.pointer_interact_pos() {
-        let any_pressed = ctx.input().pointer.any_pressed();
+        let any_pressed = ctx.input(|i| i.pointer.any_pressed());
         any_pressed && ctx.layer_id_at(pointer_pos) == Some(layer_id)
     } else {
         false
@@ -426,13 +444,13 @@ fn pointer_pressed_on_area(ctx: &Context, layer_id: LayerId) -> bool {
 }
 
 fn automatic_area_position(ctx: &Context) -> Pos2 {
-    let mut existing: Vec<Rect> = ctx
-        .memory()
-        .areas
-        .visible_windows()
-        .into_iter()
-        .map(State::rect)
-        .collect();
+    let mut existing: Vec<Rect> = ctx.memory(|mem| {
+        mem.areas
+            .visible_windows()
+            .into_iter()
+            .map(State::rect)
+            .collect()
+    });
     existing.sort_by_key(|r| r.left().round() as i32);
 
     let available_rect = ctx.available_rect();

crates/egui/src/containers/collapsing_header.rs

@@ -26,13 +26,14 @@ pub struct CollapsingState {
 
 impl CollapsingState {
     pub fn load(ctx: &Context, id: Id) -> Option<Self> {
-        ctx.data()
-            .get_persisted::<InnerState>(id)
-            .map(|state| Self { id, state })
+        ctx.data_mut(|d| {
+            d.get_persisted::<InnerState>(id)
+                .map(|state| Self { id, state })
+        })
     }
 
     pub fn store(&self, ctx: &Context) {
-        ctx.data().insert_persisted(self.id, self.state);
+        ctx.data_mut(|d| d.insert_persisted(self.id, self.state));
     }
 
     pub fn id(&self) -> Id {
@@ -64,7 +65,7 @@ impl CollapsingState {
 
     /// 0 for closed, 1 for open, with tweening
     pub fn openness(&self, ctx: &Context) -> f32 {
-        if ctx.memory().everything_is_visible() {
+        if ctx.memory(|mem| mem.everything_is_visible()) {
             1.0
         } else {
             ctx.animate_bool(self.id, self.state.open)
@@ -111,10 +112,7 @@ impl CollapsingState {
             response.rect.center().y,
         ));
         let openness = self.openness(ui.ctx());
-        let small_icon_response = Response {
-            rect: icon_rect,
-            ..response.clone()
-        };
+        let small_icon_response = response.clone().with_new_rect(icon_rect);
         icon_fn(ui, openness, &small_icon_response);
         response
     }
@@ -143,9 +141,10 @@ impl CollapsingState {
         add_header: impl FnOnce(&mut Ui) -> HeaderRet,
     ) -> HeaderResponse<'_, HeaderRet> {
         let header_response = ui.horizontal(|ui| {
+            let prev_item_spacing = ui.spacing_mut().item_spacing;
             ui.spacing_mut().item_spacing.x = 0.0; // the toggler button uses the full indent width
             let collapser = self.show_default_button_indented(ui);
-            ui.spacing_mut().item_spacing.x = ui.spacing_mut().icon_spacing; // Restore spacing
+            ui.spacing_mut().item_spacing = prev_item_spacing;
             (collapser, add_header(ui))
         });
         HeaderResponse {
@@ -555,7 +554,7 @@ impl CollapsingHeader {
                 ui.painter().add(epaint::RectShape {
                     rect: header_response.rect.expand(visuals.expansion),
                     rounding: visuals.rounding,
-                    fill: visuals.bg_fill,
+                    fill: visuals.weak_bg_fill,
                     stroke: visuals.bg_stroke,
                     // stroke: Default::default(),
                 });
@@ -575,10 +574,7 @@ impl CollapsingHeader {
                     header_response.rect.left() + ui.spacing().indent / 2.0,
                     header_response.rect.center().y,
                 ));
-                let icon_response = Response {
-                    rect: icon_rect,
-                    ..header_response.clone()
-                };
+                let icon_response = header_response.clone().with_new_rect(icon_rect);
                 if let Some(icon) = icon {
                     icon(ui, openness, &icon_response);
                 } else {

crates/egui/src/containers/combo_box.rs

@@ -162,9 +162,6 @@ impl ComboBox {
         let button_id = ui.make_persistent_id(id_source);
 
         ui.horizontal(|ui| {
-            if let Some(width) = width {
-                ui.spacing_mut().slider_width = width; // yes, this is ugly. Will remove later.
-            }
             let mut ir = combo_box_dyn(
                 ui,
                 button_id,
@@ -172,6 +169,7 @@ impl ComboBox {
                 menu_contents,
                 icon,
                 wrap_enabled,
+                width,
             );
             if let Some(label) = label {
                 ir.response
@@ -240,21 +238,17 @@ fn combo_box_dyn<'c, R>(
     menu_contents: Box<dyn FnOnce(&mut Ui) -> R + 'c>,
     icon: Option<IconPainter>,
     wrap_enabled: bool,
+    width: Option<f32>,
 ) -> InnerResponse<Option<R>> {
     let popup_id = button_id.with("popup");
 
-    let is_popup_open = ui.memory().is_popup_open(popup_id);
+    let is_popup_open = ui.memory(|m| m.is_popup_open(popup_id));
 
-    let popup_height = ui
-        .ctx()
-        .memory()
-        .areas
-        .get(popup_id)
-        .map_or(100.0, |state| state.size.y);
+    let popup_height = ui.memory(|m| m.areas.get(popup_id).map_or(100.0, |state| state.size.y));
 
     let above_or_below =
         if ui.next_widget_position().y + ui.spacing().interact_size.y + popup_height
-            < ui.ctx().input().screen_rect().bottom()
+            < ui.ctx().screen_rect().bottom()
         {
             AboveOrBelow::Below
         } else {
@@ -263,18 +257,20 @@ fn combo_box_dyn<'c, R>(
 
     let margin = ui.spacing().button_padding;
     let button_response = button_frame(ui, button_id, is_popup_open, Sense::click(), |ui| {
+        let icon_spacing = ui.spacing().icon_spacing;
         // We don't want to change width when user selects something new
         let full_minimum_width = if wrap_enabled {
             // Currently selected value's text will be wrapped if needed, so occupy the available width.
             ui.available_width()
         } else {
-            // Occupy at least the minimum width assigned to Slider and ComboBox.
-            ui.spacing().slider_width - 2.0 * margin.x
+            // Occupy at least the minimum width assigned to ComboBox.
+            let width = width.unwrap_or_else(|| ui.spacing().combo_width);
+            width - 2.0 * margin.x
         };
         let icon_size = Vec2::splat(ui.spacing().icon_width);
         let wrap_width = if wrap_enabled {
             // Use the available width, currently selected value's text will be wrapped if exceeds this value.
-            ui.available_width() - ui.spacing().item_spacing.x - icon_size.x
+            ui.available_width() - icon_spacing - icon_size.x
         } else {
             // Use all the width necessary to display the currently selected value's text.
             f32::INFINITY
@@ -288,7 +284,7 @@ fn combo_box_dyn<'c, R>(
             full_minimum_width
         } else {
             // Occupy at least the minimum width needed to contain the widget with the currently selected value's text.
-            galley.size().x + ui.spacing().item_spacing.x + icon_size.x
+            galley.size().x + icon_spacing + icon_size.x
         };
 
         // Case : wrap_enabled : occupy all the available width.
@@ -333,7 +329,7 @@ fn combo_box_dyn<'c, R>(
     });
 
     if button_response.clicked() {
-        ui.memory().toggle_popup(popup_id);
+        ui.memory_mut(|mem| mem.toggle_popup(popup_id));
     }
     let inner = crate::popup::popup_above_or_below_widget(
         ui,
@@ -390,7 +386,7 @@ fn button_frame(
             epaint::RectShape {
                 rect: outer_rect.expand(visuals.expansion),
                 rounding: visuals.rounding,
-                fill: visuals.bg_fill,
+                fill: visuals.weak_bg_fill,
                 stroke: visuals.bg_stroke,
             },
         );

crates/egui/src/containers/frame.rs

@@ -19,11 +19,16 @@ use epaint::*;
 pub struct Frame {
     /// Margin within the painted frame.
     pub inner_margin: Margin,
+
     /// Margin outside the painted frame.
     pub outer_margin: Margin,
+
     pub rounding: Rounding,
+
     pub shadow: Shadow,
+
     pub fill: Color32,
+
     pub stroke: Stroke,
 }
 

crates/egui/src/containers/panel.rs

@@ -28,7 +28,7 @@ pub struct PanelState {
 
 impl PanelState {
     pub fn load(ctx: &Context, bar_id: Id) -> Option<Self> {
-        ctx.data().get_persisted(bar_id)
+        ctx.data_mut(|d| d.get_persisted(bar_id))
     }
 
     /// The size of the panel (from previous frame).
@@ -37,7 +37,7 @@ impl PanelState {
     }
 
     fn store(self, ctx: &Context, bar_id: Id) {
-        ctx.data().insert_persisted(bar_id, self);
+        ctx.data_mut(|d| d.insert_persisted(bar_id, self));
     }
 }
 
@@ -245,11 +245,12 @@ impl SidePanel {
                     && (resize_x - pointer.x).abs()
                         <= ui.style().interaction.resize_grab_radius_side;
 
-                let any_pressed = ui.input().pointer.any_pressed(); // avoid deadlocks
-                if any_pressed && ui.input().pointer.any_down() && mouse_over_resize_line {
-                    ui.memory().set_dragged_id(resize_id);
+                if ui.input(|i| i.pointer.any_pressed() && i.pointer.any_down())
+                    && mouse_over_resize_line
+                {
+                    ui.memory_mut(|mem| mem.set_dragged_id(resize_id));
                 }
-                is_resizing = ui.memory().is_being_dragged(resize_id);
+                is_resizing = ui.memory(|mem| mem.is_being_dragged(resize_id));
                 if is_resizing {
                     let width = (pointer.x - side.side_x(panel_rect)).abs();
                     let width =
@@ -257,12 +258,12 @@ impl SidePanel {
                     side.set_rect_width(&mut panel_rect, width);
                 }
 
-                let any_down = ui.input().pointer.any_down(); // avoid deadlocks
-                let dragging_something_else = any_down || ui.input().pointer.any_pressed();
+                let dragging_something_else =
+                    ui.input(|i| i.pointer.any_down() || i.pointer.any_pressed());
                 resize_hover = mouse_over_resize_line && !dragging_something_else;
 
                 if resize_hover || is_resizing {
-                    ui.output().cursor_icon = CursorIcon::ResizeHorizontal;
+                    ui.ctx().set_cursor_icon(CursorIcon::ResizeHorizontal);
                 }
             }
         }
@@ -296,12 +297,12 @@ impl SidePanel {
 
         {
             let stroke = if is_resizing {
-                ui.style().visuals.widgets.active.bg_stroke
+                ui.style().visuals.widgets.active.fg_stroke // highly visible
             } else if resize_hover {
-                ui.style().visuals.widgets.hovered.bg_stroke
+                ui.style().visuals.widgets.hovered.fg_stroke // highly visible
             } else if show_separator_line {
                 // TOOD(emilk): distinguish resizable from non-resizable
-                ui.style().visuals.widgets.noninteractive.bg_stroke
+                ui.style().visuals.widgets.noninteractive.bg_stroke // dim
             } else {
                 Stroke::NONE
             };
@@ -334,19 +335,19 @@ impl SidePanel {
         let layer_id = LayerId::background();
         let side = self.side;
         let available_rect = ctx.available_rect();
-        let clip_rect = ctx.input().screen_rect();
+        let clip_rect = ctx.screen_rect();
         let mut panel_ui = Ui::new(ctx.clone(), layer_id, self.id, available_rect, clip_rect);
 
         let inner_response = self.show_inside_dyn(&mut panel_ui, add_contents);
         let rect = inner_response.response.rect;
 
         match side {
-            Side::Left => ctx
-                .frame_state()
-                .allocate_left_panel(Rect::from_min_max(available_rect.min, rect.max)),
-            Side::Right => ctx
-                .frame_state()
-                .allocate_right_panel(Rect::from_min_max(rect.min, available_rect.max)),
+            Side::Left => ctx.frame_state_mut(|state| {
+                state.allocate_left_panel(Rect::from_min_max(available_rect.min, rect.max));
+            }),
+            Side::Right => ctx.frame_state_mut(|state| {
+                state.allocate_right_panel(Rect::from_min_max(rect.min, available_rect.max));
+            }),
         }
         inner_response
     }
@@ -682,7 +683,7 @@ impl TopBottomPanel {
         let mut is_resizing = false;
         if resizable {
             let resize_id = id.with("__resize");
-            let latest_pos = ui.input().pointer.latest_pos();
+            let latest_pos = ui.input(|i| i.pointer.latest_pos());
             if let Some(pointer) = latest_pos {
                 let we_are_on_top = ui
                     .ctx()
@@ -695,13 +696,12 @@ impl TopBottomPanel {
                     && (resize_y - pointer.y).abs()
                         <= ui.style().interaction.resize_grab_radius_side;
 
-                if ui.input().pointer.any_pressed()
-                    && ui.input().pointer.any_down()
+                if ui.input(|i| i.pointer.any_pressed() && i.pointer.any_down())
                     && mouse_over_resize_line
                 {
-                    ui.memory().interaction.drag_id = Some(resize_id);
+                    ui.memory_mut(|mem| mem.interaction.drag_id = Some(resize_id));
                 }
-                is_resizing = ui.memory().interaction.drag_id == Some(resize_id);
+                is_resizing = ui.memory(|mem| mem.interaction.drag_id == Some(resize_id));
                 if is_resizing {
                     let height = (pointer.y - side.side_y(panel_rect)).abs();
                     let height = clamp_to_range(height, height_range.clone())
@@ -709,12 +709,12 @@ impl TopBottomPanel {
                     side.set_rect_height(&mut panel_rect, height);
                 }
 
-                let any_down = ui.input().pointer.any_down(); // avoid deadlocks
-                let dragging_something_else = any_down || ui.input().pointer.any_pressed();
+                let dragging_something_else =
+                    ui.input(|i| i.pointer.any_down() || i.pointer.any_pressed());
                 resize_hover = mouse_over_resize_line && !dragging_something_else;
 
                 if resize_hover || is_resizing {
-                    ui.output().cursor_icon = CursorIcon::ResizeVertical;
+                    ui.ctx().set_cursor_icon(CursorIcon::ResizeVertical);
                 }
             }
         }
@@ -748,12 +748,12 @@ impl TopBottomPanel {
 
         {
             let stroke = if is_resizing {
-                ui.style().visuals.widgets.active.bg_stroke
+                ui.style().visuals.widgets.active.fg_stroke // highly visible
             } else if resize_hover {
-                ui.style().visuals.widgets.hovered.bg_stroke
+                ui.style().visuals.widgets.hovered.fg_stroke // highly visible
             } else if show_separator_line {
                 // TOOD(emilk): distinguish resizable from non-resizable
-                ui.style().visuals.widgets.noninteractive.bg_stroke
+                ui.style().visuals.widgets.noninteractive.bg_stroke // dim
             } else {
                 Stroke::NONE
             };
@@ -787,7 +787,7 @@ impl TopBottomPanel {
         let available_rect = ctx.available_rect();
         let side = self.side;
 
-        let clip_rect = ctx.input().screen_rect();
+        let clip_rect = ctx.screen_rect();
         let mut panel_ui = Ui::new(ctx.clone(), layer_id, self.id, available_rect, clip_rect);
 
         let inner_response = self.show_inside_dyn(&mut panel_ui, add_contents);
@@ -795,12 +795,14 @@ impl TopBottomPanel {
 
         match side {
             TopBottomSide::Top => {
-                ctx.frame_state()
-                    .allocate_top_panel(Rect::from_min_max(available_rect.min, rect.max));
+                ctx.frame_state_mut(|state| {
+                    state.allocate_top_panel(Rect::from_min_max(available_rect.min, rect.max));
+                });
             }
             TopBottomSide::Bottom => {
-                ctx.frame_state()
-                    .allocate_bottom_panel(Rect::from_min_max(rect.min, available_rect.max));
+                ctx.frame_state_mut(|state| {
+                    state.allocate_bottom_panel(Rect::from_min_max(rect.min, available_rect.max));
+                });
             }
         }
 
@@ -1042,14 +1044,13 @@ impl CentralPanel {
         let layer_id = LayerId::background();
         let id = Id::new("central_panel");
 
-        let clip_rect = ctx.input().screen_rect();
+        let clip_rect = ctx.screen_rect();
         let mut panel_ui = Ui::new(ctx.clone(), layer_id, id, available_rect, clip_rect);
 
         let inner_response = self.show_inside_dyn(&mut panel_ui, add_contents);
 
         // Only inform ctx about what we actually used, so we can shrink the native window to fit.
-        ctx.frame_state()
-            .allocate_central_panel(inner_response.response.rect);
+        ctx.frame_state_mut(|state| state.allocate_central_panel(inner_response.response.rect));
 
         inner_response
     }

crates/egui/src/containers/popup.rs

@@ -13,11 +13,11 @@ pub(crate) struct TooltipState {
 
 impl TooltipState {
     pub fn load(ctx: &Context) -> Option<Self> {
-        ctx.data().get_temp(Id::null())
+        ctx.data_mut(|d| d.get_temp(Id::null()))
     }
 
     fn store(self, ctx: &Context) {
-        ctx.data().insert_temp(Id::null(), self);
+        ctx.data_mut(|d| d.insert_temp(Id::null(), self));
     }
 
     fn individual_tooltip_size(&self, common_id: Id, index: usize) -> Option<Vec2> {
@@ -95,9 +95,7 @@ pub fn show_tooltip_at_pointer<R>(
     add_contents: impl FnOnce(&mut Ui) -> R,
 ) -> Option<R> {
     let suggested_pos = ctx
-        .input()
-        .pointer
-        .hover_pos()
+        .input(|i| i.pointer.hover_pos())
         .map(|pointer_pos| pointer_pos + vec2(16.0, 16.0));
     show_tooltip_at(ctx, id, suggested_pos, add_contents)
 }
@@ -112,7 +110,7 @@ pub fn show_tooltip_for<R>(
     add_contents: impl FnOnce(&mut Ui) -> R,
 ) -> Option<R> {
     let expanded_rect = rect.expand2(vec2(2.0, 4.0));
-    let (above, position) = if ctx.input().any_touches() {
+    let (above, position) = if ctx.input(|i| i.any_touches()) {
         (true, expanded_rect.left_top())
     } else {
         (false, expanded_rect.left_bottom())
@@ -159,8 +157,7 @@ fn show_tooltip_at_avoid_dyn<'c, R>(
 
     // if there are multiple tooltips open they should use the same common_id for the `tooltip_size` caching to work.
     let mut frame_state =
-        ctx.frame_state()
-            .tooltip_state
+        ctx.frame_state(|fs| fs.tooltip_state)
             .unwrap_or(crate::frame_state::TooltipFrameState {
                 common_id: individual_id,
                 rect: Rect::NOTHING,
@@ -176,7 +173,7 @@ fn show_tooltip_at_avoid_dyn<'c, R>(
         }
     } else if let Some(position) = suggested_position {
         position
-    } else if ctx.memory().everything_is_visible() {
+    } else if ctx.memory(|mem| mem.everything_is_visible()) {
         Pos2::ZERO
     } else {
         return None; // No good place for a tooltip :(
@@ -191,7 +188,7 @@ fn show_tooltip_at_avoid_dyn<'c, R>(
         position.y -= expected_size.y;
     }
 
-    position = position.at_most(ctx.input().screen_rect().max - expected_size);
+    position = position.at_most(ctx.screen_rect().max - expected_size);
 
     // check if we intersect the avoid_rect
     {
@@ -209,7 +206,7 @@ fn show_tooltip_at_avoid_dyn<'c, R>(
         }
     }
 
-    let position = position.at_least(ctx.input().screen_rect().min);
+    let position = position.at_least(ctx.screen_rect().min);
 
     let area_id = frame_state.common_id.with(frame_state.count);
 
@@ -226,7 +223,7 @@ fn show_tooltip_at_avoid_dyn<'c, R>(
 
     frame_state.count += 1;
     frame_state.rect = frame_state.rect.union(response.rect);
-    ctx.frame_state().tooltip_state = Some(frame_state);
+    ctx.frame_state_mut(|fs| fs.tooltip_state = Some(frame_state));
 
     Some(inner)
 }
@@ -263,8 +260,9 @@ fn show_tooltip_area_dyn<'c, R>(
     Area::new(area_id)
         .order(Order::Tooltip)
         .fixed_pos(window_pos)
+        .constrain(true)
         .interactable(false)
-        .drag_bounds(Rect::EVERYTHING) // disable clip rect
+        .drag_bounds(ctx.screen_rect())
         .show(ctx, |ui| {
             Frame::popup(&ctx.style())
                 .show(ui, |ui| {
@@ -283,7 +281,7 @@ pub fn was_tooltip_open_last_frame(ctx: &Context, tooltip_id: Id) -> bool {
                 if *individual_id == tooltip_id {
                     let area_id = common_id.with(count);
                     let layer_id = LayerId::new(Order::Tooltip, area_id);
-                    if ctx.memory().areas.visible_last_frame(&layer_id) {
+                    if ctx.memory(|mem| mem.areas.visible_last_frame(&layer_id)) {
                         return true;
                     }
                 }
@@ -314,6 +312,8 @@ pub fn popup_below_widget<R>(
 ///
 /// Useful for drop-down menus (combo boxes) or suggestion menus under text fields.
 ///
+/// The opened popup will have the same width as the parent.
+///
 /// You must open the popup with [`Memory::open_popup`] or  [`Memory::toggle_popup`].
 ///
 /// Returns `None` if the popup is not open.
@@ -323,7 +323,7 @@ pub fn popup_below_widget<R>(
 /// let response = ui.button("Open popup");
 /// let popup_id = ui.make_persistent_id("my_unique_id");
 /// if response.clicked() {
-///     ui.memory().toggle_popup(popup_id);
+///     ui.memory_mut(|mem| mem.toggle_popup(popup_id));
 /// }
 /// let below = egui::AboveOrBelow::Below;
 /// egui::popup::popup_above_or_below_widget(ui, popup_id, &response, below, |ui| {
@@ -340,7 +340,7 @@ pub fn popup_above_or_below_widget<R>(
     above_or_below: AboveOrBelow,
     add_contents: impl FnOnce(&mut Ui) -> R,
 ) -> Option<R> {
-    if ui.memory().is_popup_open(popup_id) {
+    if ui.memory(|mem| mem.is_popup_open(popup_id)) {
         let (pos, pivot) = match above_or_below {
             AboveOrBelow::Above => (widget_response.rect.left_top(), Align2::LEFT_BOTTOM),
             AboveOrBelow::Below => (widget_response.rect.left_bottom(), Align2::LEFT_TOP),
@@ -368,8 +368,8 @@ pub fn popup_above_or_below_widget<R>(
             })
             .inner;
 
-        if ui.input().key_pressed(Key::Escape) || widget_response.clicked_elsewhere() {
-            ui.memory().close_popup();
+        if ui.input(|i| i.key_pressed(Key::Escape)) || widget_response.clicked_elsewhere() {
+            ui.memory_mut(|mem| mem.close_popup());
         }
         Some(inner)
     } else {

crates/egui/src/containers/resize.rs

@@ -18,11 +18,11 @@ pub(crate) struct State {
 
 impl State {
     pub fn load(ctx: &Context, id: Id) -> Option<Self> {
-        ctx.data().get_persisted(id)
+        ctx.data_mut(|d| d.get_persisted(id))
     }
 
     pub fn store(self, ctx: &Context, id: Id) {
-        ctx.data().insert_persisted(id, self);
+        ctx.data_mut(|d| d.insert_persisted(id, self));
     }
 }
 
@@ -180,7 +180,7 @@ impl Resize {
                 .at_least(self.min_size)
                 .at_most(self.max_size)
                 .at_most(
-                    ui.input().screen_rect().size() - ui.spacing().window_margin.sum(), // hack for windows
+                    ui.ctx().screen_rect().size() - ui.spacing().window_margin.sum(), // hack for windows
                 );
 
             State {
@@ -305,7 +305,7 @@ impl Resize {
             paint_resize_corner(ui, &corner_response);
 
             if corner_response.hovered() || corner_response.dragged() {
-                ui.ctx().output().cursor_icon = CursorIcon::ResizeNwSe;
+                ui.ctx().set_cursor_icon(CursorIcon::ResizeNwSe);
             }
         }
 

crates/egui/src/containers/scroll_area.rs

@@ -48,11 +48,11 @@ impl Default for State {
 
 impl State {
     pub fn load(ctx: &Context, id: Id) -> Option<Self> {
-        ctx.data().get_persisted(id)
+        ctx.data_mut(|d| d.get_persisted(id))
     }
 
     pub fn store(self, ctx: &Context, id: Id) {
-        ctx.data().insert_persisted(id, self);
+        ctx.data_mut(|d| d.insert_persisted(id, self));
     }
 }
 
@@ -426,15 +426,34 @@ impl ScrollArea {
 
         let content_max_rect = Rect::from_min_size(inner_rect.min - state.offset, content_max_size);
         let mut content_ui = ui.child_ui(content_max_rect, *ui.layout());
-        let mut content_clip_rect = inner_rect.expand(ui.visuals().clip_rect_margin);
-        content_clip_rect = content_clip_rect.intersect(ui.clip_rect());
-        // Nice handling of forced resizing beyond the possible:
-        for d in 0..2 {
-            if !has_bar[d] {
-                content_clip_rect.max[d] = ui.clip_rect().max[d] - current_bar_use[d];
+
+        {
+            // Clip the content, but only when we really need to:
+            let clip_rect_margin = ui.visuals().clip_rect_margin;
+            let scroll_bar_inner_margin = ui.spacing().scroll_bar_inner_margin;
+            let mut content_clip_rect = ui.clip_rect();
+            for d in 0..2 {
+                if has_bar[d] {
+                    if state.content_is_too_large[d] {
+                        content_clip_rect.min[d] = inner_rect.min[d] - clip_rect_margin;
+                        content_clip_rect.max[d] = inner_rect.max[d] + clip_rect_margin;
+                    }
+
+                    if state.show_scroll[d] {
+                        // Make sure content doesn't cover scroll bars
+                        let tiny_gap = 1.0;
+                        content_clip_rect.max[1 - d] =
+                            inner_rect.max[1 - d] + scroll_bar_inner_margin - tiny_gap;
+                    }
+                } else {
+                    // Nice handling of forced resizing beyond the possible:
+                    content_clip_rect.max[d] = ui.clip_rect().max[d] - current_bar_use[d];
+                }
             }
+            // Make sure we din't accidentally expand the clip rect
+            content_clip_rect = content_clip_rect.intersect(ui.clip_rect());
+            content_ui.set_clip_rect(content_clip_rect);
         }
-        content_ui.set_clip_rect(content_clip_rect);
 
         let viewport = Rect::from_min_size(Pos2::ZERO + state.offset, inner_size);
 
@@ -449,8 +468,10 @@ impl ScrollArea {
             if content_response.dragged() {
                 for d in 0..2 {
                     if has_bar[d] {
-                        state.offset[d] -= ui.input().pointer.delta()[d];
-                        state.vel[d] = ui.input().pointer.velocity()[d];
+                        ui.input(|input| {
+                            state.offset[d] -= input.pointer.delta()[d];
+                            state.vel[d] = input.pointer.velocity()[d];
+                        });
                         state.scroll_stuck_to_end[d] = false;
                     } else {
                         state.vel[d] = 0.0;
@@ -459,7 +480,7 @@ impl ScrollArea {
             } else {
                 let stop_speed = 20.0; // Pixels per second.
                 let friction_coeff = 1000.0; // Pixels per second squared.
-                let dt = ui.input().unstable_dt;
+                let dt = ui.input(|i| i.unstable_dt);
 
                 let friction = friction_coeff * dt;
                 if friction > state.vel.length() || state.vel.length() < stop_speed {
@@ -603,7 +624,9 @@ impl Prepared {
         for d in 0..2 {
             if has_bar[d] {
                 // We take the scroll target so only this ScrollArea will use it:
-                let scroll_target = content_ui.ctx().frame_state().scroll_target[d].take();
+                let scroll_target = content_ui
+                    .ctx()
+                    .frame_state_mut(|state| state.scroll_target[d].take());
                 if let Some((scroll, align)) = scroll_target {
                     let min = content_ui.min_rect().min[d];
                     let clip_rect = content_ui.clip_rect();
@@ -668,8 +691,7 @@ impl Prepared {
         if scrolling_enabled && ui.rect_contains_pointer(outer_rect) {
             for d in 0..2 {
                 if has_bar[d] {
-                    let mut frame_state = ui.ctx().frame_state();
-                    let scroll_delta = frame_state.scroll_delta;
+                    let scroll_delta = ui.ctx().frame_state(|fs| fs.scroll_delta);
 
                     let scrolling_up = state.offset[d] > 0.0 && scroll_delta[d] > 0.0;
                     let scrolling_down = state.offset[d] < max_offset[d] && scroll_delta[d] < 0.0;
@@ -677,7 +699,7 @@ impl Prepared {
                     if scrolling_up || scrolling_down {
                         state.offset[d] -= scroll_delta[d];
                         // Clear scroll delta so no parent scroll will use it.
-                        frame_state.scroll_delta[d] = 0.0;
+                        ui.ctx().frame_state_mut(|fs| fs.scroll_delta[d] = 0.0);
                         state.scroll_stuck_to_end[d] = false;
                     }
                 }
@@ -819,7 +841,7 @@ impl Prepared {
                         ),
                     )
                 };
-                let min_handle_size = ui.spacing().scroll_bar_width;
+                let min_handle_size = ui.spacing().scroll_handle_min_length;
                 if handle_rect.size()[d] < min_handle_size {
                     handle_rect = Rect::from_center_size(
                         handle_rect.center(),

crates/egui/src/containers/window.rs

@@ -10,7 +10,7 @@ use super::*;
 ///
 /// You can customize:
 /// * title
-/// * default, minimum, maximum and/or fixed size
+/// * default, minimum, maximum and/or fixed size, collapsed/expanded
 /// * if the window has a scroll area (off by default)
 /// * if the window can be collapsed (minimized) to just the title bar (yes, by default)
 /// * if there should be a close button (none by default)
@@ -30,6 +30,7 @@ pub struct Window<'open> {
     resize: Resize,
     scroll: ScrollArea,
     collapsible: bool,
+    default_open: bool,
     with_title_bar: bool,
 }
 
@@ -51,6 +52,7 @@ impl<'open> Window<'open> {
                 .default_size([340.0, 420.0]), // Default inner size of a window
             scroll: ScrollArea::neither(),
             collapsible: true,
+            default_open: true,
             with_title_bar: true,
         }
     }
@@ -77,6 +79,18 @@ impl<'open> Window<'open> {
         self
     }
 
+    /// If `false` the window will be non-interactive.
+    pub fn interactable(mut self, interactable: bool) -> Self {
+        self.area = self.area.interactable(interactable);
+        self
+    }
+
+    /// If `false` the window will be immovable.
+    pub fn movable(mut self, movable: bool) -> Self {
+        self.area = self.area.movable(movable);
+        self
+    }
+
     /// Usage: `Window::new(…).mutate(|w| w.resize = w.resize.auto_expand_width(true))`
     // TODO(emilk): I'm not sure this is a good interface for this.
     pub fn mutate(mut self, mutate: impl Fn(&mut Self)) -> Self {
@@ -162,6 +176,12 @@ impl<'open> Window<'open> {
         self
     }
 
+    /// Set initial collapsed state of the window
+    pub fn default_open(mut self, default_open: bool) -> Self {
+        self.default_open = default_open;
+        self
+    }
+
     /// Set initial size of the window.
     pub fn default_size(mut self, default_size: impl Into<Vec2>) -> Self {
         self.resize = self.resize.default_size(default_size);
@@ -275,12 +295,14 @@ impl<'open> Window<'open> {
             resize,
             scroll,
             collapsible,
+            default_open,
             with_title_bar,
         } = self;
 
         let frame = frame.unwrap_or_else(|| Frame::window(&ctx.style()));
 
-        let is_open = !matches!(open, Some(false)) || ctx.memory().everything_is_visible();
+        let is_explicitly_closed = matches!(open, Some(false));
+        let is_open = !is_explicitly_closed || ctx.memory(|mem| mem.everything_is_visible());
         area.show_open_close_animation(ctx, &frame, is_open);
 
         if !is_open {
@@ -291,7 +313,7 @@ impl<'open> Window<'open> {
         let area_layer_id = area.layer();
         let resize_id = area_id.with("resize");
         let mut collapsing =
-            CollapsingState::load_with_default_open(ctx, area_id.with("collapsing"), true);
+            CollapsingState::load_with_default_open(ctx, area_id.with("collapsing"), default_open);
 
         let is_collapsed = with_title_bar && !collapsing.is_open();
         let possible = PossibleInteractions::new(&area, &resize, is_collapsed);
@@ -318,7 +340,7 @@ impl<'open> Window<'open> {
                 // Calculate roughly how much larger the window size is compared to the inner rect
                 let title_bar_height = if with_title_bar {
                     let style = ctx.style();
-                    title.font_height(&ctx.fonts(), &style) + title_content_spacing
+                    ctx.fonts(|f| title.font_height(f, &style)) + title_content_spacing
                 } else {
                     0.0
                 };
@@ -404,7 +426,7 @@ impl<'open> Window<'open> {
                     ctx.style().visuals.widgets.active,
                 );
             } else if let Some(hover_interaction) = hover_interaction {
-                if ctx.input().pointer.has_pointer() {
+                if ctx.input(|i| i.pointer.has_pointer()) {
                     paint_frame_interaction(
                         &mut area_content_ui,
                         outer_rect,
@@ -416,9 +438,12 @@ impl<'open> Window<'open> {
             content_inner
         };
 
-        area.state_mut().pos = ctx
-            .constrain_window_rect_to_area(area.state().rect(), area.drag_bounds())
-            .min;
+        {
+            let pos = ctx
+                .constrain_window_rect_to_area(area.state().rect(), area.drag_bounds())
+                .left_top();
+            area.state_mut().set_left_top_pos(pos);
+        }
 
         let full_response = area.end(ctx, area_content_ui);
 
@@ -499,13 +524,13 @@ pub(crate) struct WindowInteraction {
 impl WindowInteraction {
     pub fn set_cursor(&self, ctx: &Context) {
         if (self.left && self.top) || (self.right && self.bottom) {
-            ctx.output().cursor_icon = CursorIcon::ResizeNwSe;
+            ctx.set_cursor_icon(CursorIcon::ResizeNwSe);
         } else if (self.right && self.top) || (self.left && self.bottom) {
-            ctx.output().cursor_icon = CursorIcon::ResizeNeSw;
+            ctx.set_cursor_icon(CursorIcon::ResizeNeSw);
         } else if self.left || self.right {
-            ctx.output().cursor_icon = CursorIcon::ResizeHorizontal;
+            ctx.set_cursor_icon(CursorIcon::ResizeHorizontal);
         } else if self.bottom || self.top {
-            ctx.output().cursor_icon = CursorIcon::ResizeVertical;
+            ctx.set_cursor_icon(CursorIcon::ResizeVertical);
         }
     }
 
@@ -528,7 +553,7 @@ fn interact(
     let new_rect = ctx.constrain_window_rect_to_area(new_rect, area.drag_bounds());
 
     // TODO(emilk): add this to a Window state instead as a command "move here next frame"
-    area.state_mut().pos = new_rect.min;
+    area.state_mut().set_left_top_pos(new_rect.left_top());
 
     if window_interaction.is_resize() {
         if let Some(mut state) = resize::State::load(ctx, resize_id) {
@@ -537,7 +562,7 @@ fn interact(
         }
     }
 
-    ctx.memory().areas.move_to_top(area_layer_id);
+    ctx.memory_mut(|mem| mem.areas.move_to_top(area_layer_id));
     Some(window_interaction)
 }
 
@@ -545,11 +570,11 @@ fn move_and_resize_window(ctx: &Context, window_interaction: &WindowInteraction)
     window_interaction.set_cursor(ctx);
 
     // Only move/resize windows with primary mouse button:
-    if !ctx.input().pointer.primary_down() {
+    if !ctx.input(|i| i.pointer.primary_down()) {
         return None;
     }
 
-    let pointer_pos = ctx.input().pointer.interact_pos()?;
+    let pointer_pos = ctx.input(|i| i.pointer.interact_pos())?;
     let mut rect = window_interaction.start_rect; // prevent drift
 
     if window_interaction.is_resize() {
@@ -571,8 +596,8 @@ fn move_and_resize_window(ctx: &Context, window_interaction: &WindowInteraction)
         // but we want anything interactive in the window (e.g. slider) to steal
         // the drag from us. It is therefor important not to move the window the first frame,
         // but instead let other widgets to the steal. HACK.
-        if !ctx.input().pointer.any_pressed() {
-            let press_origin = ctx.input().pointer.press_origin()?;
+        if !ctx.input(|i| i.pointer.any_pressed()) {
+            let press_origin = ctx.input(|i| i.pointer.press_origin())?;
             let delta = pointer_pos - press_origin;
             rect = rect.translate(delta);
         }
@@ -590,30 +615,31 @@ fn window_interaction(
     rect: Rect,
 ) -> Option<WindowInteraction> {
     {
-        let drag_id = ctx.memory().interaction.drag_id;
+        let drag_id = ctx.memory(|mem| mem.interaction.drag_id);
 
         if drag_id.is_some() && drag_id != Some(id) {
             return None;
         }
     }
 
-    let mut window_interaction = { ctx.memory().window_interaction };
+    let mut window_interaction = ctx.memory(|mem| mem.window_interaction);
 
     if window_interaction.is_none() {
         if let Some(hover_window_interaction) = resize_hover(ctx, possible, area_layer_id, rect) {
             hover_window_interaction.set_cursor(ctx);
-            let any_pressed = ctx.input().pointer.any_pressed(); // avoid deadlocks
-            if any_pressed && ctx.input().pointer.primary_down() {
-                ctx.memory().interaction.drag_id = Some(id);
-                ctx.memory().interaction.drag_is_window = true;
-                window_interaction = Some(hover_window_interaction);
-                ctx.memory().window_interaction = window_interaction;
+            if ctx.input(|i| i.pointer.any_pressed() && i.pointer.primary_down()) {
+                ctx.memory_mut(|mem| {
+                    mem.interaction.drag_id = Some(id);
+                    mem.interaction.drag_is_window = true;
+                    window_interaction = Some(hover_window_interaction);
+                    mem.window_interaction = window_interaction;
+                });
             }
         }
     }
 
     if let Some(window_interaction) = window_interaction {
-        let is_active = ctx.memory().interaction.drag_id == Some(id);
+        let is_active = ctx.memory_mut(|mem| mem.interaction.drag_id == Some(id));
 
         if is_active && window_interaction.area_layer_id == area_layer_id {
             return Some(window_interaction);
@@ -629,10 +655,9 @@ fn resize_hover(
     area_layer_id: LayerId,
     rect: Rect,
 ) -> Option<WindowInteraction> {
-    let pointer = ctx.input().pointer.interact_pos()?;
+    let pointer = ctx.input(|i| i.pointer.interact_pos())?;
 
-    let any_down = ctx.input().pointer.any_down(); // avoid deadlocks
-    if any_down && !ctx.input().pointer.any_pressed() {
+    if ctx.input(|i| i.pointer.any_down() && !i.pointer.any_pressed()) {
         return None; // already dragging (something)
     }
 
@@ -642,7 +667,7 @@ fn resize_hover(
         }
     }
 
-    if ctx.memory().interaction.drag_interest {
+    if ctx.memory(|mem| mem.interaction.drag_interest) {
         // Another widget will become active if we drag here
         return None;
     }
@@ -804,8 +829,8 @@ fn show_title_bar(
     collapsible: bool,
 ) -> TitleBar {
     let inner_response = ui.horizontal(|ui| {
-        let height = title
-            .font_height(&ui.fonts(), ui.style())
+        let height = ui
+            .fonts(|fonts| title.font_height(fonts, ui.style()))
             .max(ui.spacing().interact_size.y);
         ui.set_min_height(height);
 

crates/egui/src/data/input.rs

@@ -314,7 +314,7 @@ pub const NUM_POINTER_BUTTONS: usize = 5;
 /// NOTE: For cross-platform uses, ALT+SHIFT is a bad combination of modifiers
 /// as on mac that is how you type special characters,
 /// so those key presses are usually not reported to egui.
-#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, Default, Hash, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 pub struct Modifiers {
     /// Either of the alt keys are down (option ⌥ on Mac).
@@ -777,7 +777,7 @@ impl Key {
 ///
 /// Can be used with [`crate::InputState::consume_shortcut`]
 /// and [`crate::Context::format_shortcut`].
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq)]
 pub struct KeyboardShortcut {
     pub modifiers: Modifiers,
     pub key: Key,

crates/egui/src/data/output.rs

@@ -70,7 +70,7 @@ pub struct PlatformOutput {
     /// ```
     /// # egui::__run_test_ui(|ui| {
     /// if ui.button("📋").clicked() {
-    ///     ui.output().copied_text = "some_text".to_string();
+    ///     ui.output_mut(|o| o.copied_text = "some_text".to_string());
     /// }
     /// # });
     /// ```

crates/egui/src/frame_state.rs

@@ -1,6 +1,6 @@
 use std::ops::RangeInclusive;
 
-use crate::*;
+use crate::{id::IdSet, *};
 
 #[derive(Clone, Copy, Debug)]
 pub(crate) struct TooltipFrameState {
@@ -12,7 +12,7 @@ pub(crate) struct TooltipFrameState {
 #[cfg(feature = "accesskit")]
 #[derive(Clone)]
 pub(crate) struct AccessKitFrameState {
-    pub(crate) nodes: IdMap<Box<accesskit::Node>>,
+    pub(crate) node_builders: IdMap<accesskit::NodeBuilder>,
     pub(crate) parent_stack: Vec<Id>,
 }
 
@@ -51,6 +51,12 @@ pub(crate) struct FrameState {
 
     #[cfg(feature = "accesskit")]
     pub(crate) accesskit_state: Option<AccessKitFrameState>,
+
+    /// Highlight these widgets this next frame. Read from this.
+    pub(crate) highlight_this_frame: IdSet,
+
+    /// Highlight these widgets the next frame. Write to this.
+    pub(crate) highlight_next_frame: IdSet,
 }
 
 impl Default for FrameState {
@@ -65,6 +71,8 @@ impl Default for FrameState {
             scroll_target: [None, None],
             #[cfg(feature = "accesskit")]
             accesskit_state: None,
+            highlight_this_frame: Default::default(),
+            highlight_next_frame: Default::default(),
         }
     }
 }
@@ -81,6 +89,8 @@ impl FrameState {
             scroll_target,
             #[cfg(feature = "accesskit")]
             accesskit_state,
+            highlight_this_frame,
+            highlight_next_frame,
         } = self;
 
         used_ids.clear();
@@ -90,10 +100,13 @@ impl FrameState {
         *tooltip_state = None;
         *scroll_delta = input.scroll_delta;
         *scroll_target = [None, None];
+
         #[cfg(feature = "accesskit")]
         {
             *accesskit_state = None;
         }
+
+        *highlight_this_frame = std::mem::take(highlight_next_frame);
     }
 
     /// How much space is still available after panels has been added.

crates/egui/src/grid.rs

@@ -8,14 +8,14 @@ pub(crate) struct State {
 
 impl State {
     pub fn load(ctx: &Context, id: Id) -> Option<Self> {
-        ctx.data().get_temp(id)
+        ctx.data_mut(|d| d.get_temp(id))
     }
 
     pub fn store(self, ctx: &Context, id: Id) {
         // We don't persist Grids, because
         // A) there are potentially a lot of them, using up a lot of space (and therefore serialization time)
         // B) if the code changes, the grid _should_ change, and not remember old sizes
-        ctx.data().insert_temp(id, self);
+        ctx.data_mut(|d| d.insert_temp(id, self));
     }
 
     fn set_min_col_width(&mut self, col: usize, width: f32) {

crates/egui/src/gui_zoom.rs

@@ -26,15 +26,15 @@ pub mod kb_shortcuts {
 /// }
 /// ```
 pub fn zoom_with_keyboard_shortcuts(ctx: &Context, native_pixels_per_point: Option<f32>) {
-    if ctx.input_mut().consume_shortcut(&kb_shortcuts::ZOOM_RESET) {
+    if ctx.input_mut(|i| i.consume_shortcut(&kb_shortcuts::ZOOM_RESET)) {
         if let Some(native_pixels_per_point) = native_pixels_per_point {
             ctx.set_pixels_per_point(native_pixels_per_point);
         }
     } else {
-        if ctx.input_mut().consume_shortcut(&kb_shortcuts::ZOOM_IN) {
+        if ctx.input_mut(|i| i.consume_shortcut(&kb_shortcuts::ZOOM_IN)) {
             zoom_in(ctx);
         }
-        if ctx.input_mut().consume_shortcut(&kb_shortcuts::ZOOM_OUT) {
+        if ctx.input_mut(|i| i.consume_shortcut(&kb_shortcuts::ZOOM_OUT)) {
             zoom_out(ctx);
         }
     }

crates/egui/src/id.rs

@@ -168,5 +168,8 @@ impl std::hash::BuildHasher for BuilIdHasher {
     }
 }
 
+/// `IdSet` is a `HashSet<Id>` optimized by knowing that [`Id`] has good entropy, and doesn't need more hashing.
+pub type IdSet = std::collections::HashSet<Id, BuilIdHasher>;
+
 /// `IdMap<V>` is a `HashMap<Id, V>` optimized by knowing that [`Id`] has good entropy, and doesn't need more hashing.
 pub type IdMap<V> = std::collections::HashMap<Id, V, BuilIdHasher>;

crates/egui/src/input_state.rs

@@ -368,7 +368,7 @@ impl InputState {
     /// # egui::__run_test_ui(|ui| {
     /// let mut zoom = 1.0; // no zoom
     /// let mut rotation = 0.0; // no rotation
-    /// let multi_touch = ui.input().multi_touch();
+    /// let multi_touch = ui.input(|i| i.multi_touch());
     /// if let Some(multi_touch) = multi_touch {
     ///     zoom *= multi_touch.zoom_delta;
     ///     rotation += multi_touch.rotation_delta;
@@ -447,9 +447,10 @@ impl InputState {
 #[derive(Clone, Debug, PartialEq)]
 pub(crate) struct Click {
     pub pos: Pos2,
-    pub button: PointerButton,
+
     /// 1 or 2 (double-click) or 3 (triple-click)
     pub count: u32,
+
     /// Allows you to check for e.g. shift-click
     pub modifiers: Modifiers,
 }
@@ -471,7 +472,10 @@ pub(crate) enum PointerEvent {
         position: Pos2,
         button: PointerButton,
     },
-    Released(Option<Click>),
+    Released {
+        click: Option<Click>,
+        button: PointerButton,
+    },
 }
 
 impl PointerEvent {
@@ -480,11 +484,11 @@ impl PointerEvent {
     }
 
     pub fn is_release(&self) -> bool {
-        matches!(self, PointerEvent::Released(_))
+        matches!(self, PointerEvent::Released { .. })
     }
 
     pub fn is_click(&self) -> bool {
-        matches!(self, PointerEvent::Released(Some(_click)))
+        matches!(self, PointerEvent::Released { click: Some(_), .. })
     }
 }
 
@@ -639,7 +643,6 @@ impl PointerState {
 
                             Some(Click {
                                 pos,
-                                button,
                                 count,
                                 modifiers,
                             })
@@ -647,7 +650,8 @@ impl PointerState {
                             None
                         };
 
-                        self.pointer_events.push(PointerEvent::Released(click));
+                        self.pointer_events
+                            .push(PointerEvent::Released { click, button });
 
                         self.press_origin = None;
                         self.press_start_time = None;
@@ -775,11 +779,28 @@ impl PointerState {
         self.pointer_events.iter().any(|event| event.is_release())
     }
 
+    /// Was the button given pressed this frame?
+    pub fn button_pressed(&self, button: PointerButton) -> bool {
+        self.pointer_events
+            .iter()
+            .any(|event| matches!(event, &PointerEvent::Pressed{button: b, ..} if button == b))
+    }
+
     /// Was the button given released this frame?
     pub fn button_released(&self, button: PointerButton) -> bool {
         self.pointer_events
             .iter()
-            .any(|event| matches!(event, &PointerEvent::Released(Some(Click{button: b, ..})) if button == b))
+            .any(|event| matches!(event, &PointerEvent::Released{button: b, ..} if button == b))
+    }
+
+    /// Was the primary button pressed this frame?
+    pub fn primary_pressed(&self) -> bool {
+        self.button_pressed(PointerButton::Primary)
+    }
+
+    /// Was the secondary button pressed this frame?
+    pub fn secondary_pressed(&self) -> bool {
+        self.button_pressed(PointerButton::Secondary)
     }
 
     /// Was the primary button released this frame?
@@ -811,16 +832,28 @@ impl PointerState {
 
     /// Was the button given double clicked this frame?
     pub fn button_double_clicked(&self, button: PointerButton) -> bool {
-        self.pointer_events
-            .iter()
-            .any(|event| matches!(&event, PointerEvent::Released(Some(click)) if click.button == button && click.is_double()))
+        self.pointer_events.iter().any(|event| {
+            matches!(
+                &event,
+                PointerEvent::Released {
+                    click: Some(click),
+                    button: b,
+                } if *b == button && click.is_double()
+            )
+        })
     }
 
     /// Was the button given triple clicked this frame?
     pub fn button_triple_clicked(&self, button: PointerButton) -> bool {
-        self.pointer_events
-            .iter()
-            .any(|event| matches!(&event, PointerEvent::Released(Some(click)) if click.button == button && click.is_triple()))
+        self.pointer_events.iter().any(|event| {
+            matches!(
+                &event,
+                PointerEvent::Released {
+                    click: Some(click),
+                    button: b,
+                } if *b == button && click.is_triple()
+            )
+        })
     }
 
     /// Was the primary button clicked this frame?
@@ -833,18 +866,6 @@ impl PointerState {
         self.button_clicked(PointerButton::Secondary)
     }
 
-    // /// Was this button pressed (`!down -> down`) this frame?
-    // /// This can sometimes return `true` even if `any_down() == false`
-    // /// because a press can be shorted than one frame.
-    // pub fn button_pressed(&self, button: PointerButton) -> bool {
-    //     self.pointer_events.iter().any(|event| event.is_press())
-    // }
-
-    // /// Was this button released (`down -> !down`) this frame?
-    // pub fn button_released(&self, button: PointerButton) -> bool {
-    //     self.pointer_events.iter().any(|event| event.is_release())
-    // }
-
     /// Is this button currently down?
     #[inline(always)]
     pub fn button_down(&self, button: PointerButton) -> bool {

crates/egui/src/input_state/touch_state.rs

@@ -96,10 +96,14 @@ struct GestureState {
 struct DynGestureState {
     /// used for proportional zooming
     avg_distance: f32,
+
     /// used for non-proportional zooming
     avg_abs_distance2: Vec2,
+
     avg_pos: Pos2,
+
     avg_force: f32,
+
     heading: f32,
 }
 

crates/egui/src/introspection.rs

@@ -2,7 +2,7 @@
 use crate::*;
 
 pub fn font_family_ui(ui: &mut Ui, font_family: &mut FontFamily) {
-    let families = ui.fonts().families();
+    let families = ui.fonts(|f| f.families());
     ui.horizontal(|ui| {
         for alternative in families {
             let text = alternative.to_string();
@@ -12,7 +12,7 @@ pub fn font_family_ui(ui: &mut Ui, font_family: &mut FontFamily) {
 }
 
 pub fn font_id_ui(ui: &mut Ui, font_id: &mut FontId) {
-    let families = ui.fonts().families();
+    let families = ui.fonts(|f| f.families());
     ui.horizontal(|ui| {
         ui.add(Slider::new(&mut font_id.size, 4.0..=40.0).max_decimals(1));
         for alternative in families {

crates/egui/src/layers.rs

@@ -39,6 +39,7 @@ impl Order {
         Self::Tooltip,
         Self::Debug,
     ];
+    pub const TOP: Self = Self::Debug;
 
     #[inline(always)]
     pub fn allow_interaction(&self) -> bool {

crates/egui/src/lib.rs

@@ -363,11 +363,11 @@ pub use {
     input_state::{InputState, MultiTouchInfo, PointerState},
     layers::{LayerId, Order},
     layout::*,
-    memory::Memory,
+    memory::{Memory, Options},
     painter::Painter,
     response::{InnerResponse, Response},
     sense::Sense,
-    style::{FontSelection, Style, TextStyle, Visuals},
+    style::{FontSelection, Margin, Style, TextStyle, Visuals},
     text::{Galley, TextFormat},
     ui::Ui,
     widget_text::{RichText, WidgetText},
@@ -513,18 +513,30 @@ pub mod special_emojis {
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 pub enum WidgetType {
     Label, // TODO(emilk): emit Label events
+
     /// e.g. a hyperlink
     Link,
+
     TextEdit,
+
     Button,
+
     Checkbox,
+
     RadioButton,
+
     SelectableLabel,
+
     ComboBox,
+
     Slider,
+
     DragValue,
+
     ColorButton,
+
     ImageButton,
+
     CollapsingHeader,
 
     /// If you cannot fit any of the above slots.
@@ -559,25 +571,3 @@ pub fn __run_test_ui(mut add_contents: impl FnMut(&mut Ui)) {
 pub fn accesskit_root_id() -> Id {
     Id::new("accesskit_root")
 }
-
-/// Return a tree update that the egui integration should provide to the
-/// AccessKit adapter if it cannot immediately run the egui application
-/// to get a full tree update after running [`Context::enable_accesskit`].
-#[cfg(feature = "accesskit")]
-pub fn accesskit_placeholder_tree_update() -> accesskit::TreeUpdate {
-    use accesskit::{Node, Role, Tree, TreeUpdate};
-    use std::sync::Arc;
-
-    let root_id = accesskit_root_id().accesskit_id();
-    TreeUpdate {
-        nodes: vec![(
-            root_id,
-            Arc::new(Node {
-                role: Role::Window,
-                ..Default::default()
-            }),
-        )],
-        tree: Some(Tree::new(root_id)),
-        focus: None,
-    }
-}

crates/egui/src/memory.rs

@@ -52,9 +52,10 @@ pub struct Memory {
     /// type CharCountCache<'a> = FrameCache<usize, CharCounter>;
     ///
     /// # let mut ctx = egui::Context::default();
-    /// let mut memory = ctx.memory();
-    /// let cache = memory.caches.cache::<CharCountCache<'_>>();
-    /// assert_eq!(cache.get("hello"), 5);
+    /// ctx.memory_mut(|mem| {
+    ///     let cache = mem.caches.cache::<CharCountCache<'_>>();
+    ///     assert_eq!(cache.get("hello"), 5);
+    /// });
     /// ```
     #[cfg_attr(feature = "persistence", serde(skip))]
     pub caches: crate::util::cache::CacheStorage,
@@ -102,9 +103,15 @@ pub struct Options {
     /// Controls the tessellator.
     pub tessellation_options: epaint::TessellationOptions,
 
-    /// This does not at all change the behavior of egui,
-    /// but is a signal to any backend that we want the [`crate::PlatformOutput::events`] read out loud.
+    /// This is a signal to any backend that we want the [`crate::PlatformOutput::events`] read out loud.
+    ///
+    /// The only change to egui is that labels can be focused by pressing tab.
+    ///
     /// Screen readers is an experimental feature of egui, and not supported on all platforms.
+    ///
+    /// `eframe` supports it only on web, using the `web_screen_reader` feature flag,
+    /// but you should consider using [AccessKit](https://github.com/AccessKit/accesskit) instead,
+    /// which `eframe` supports.
     pub screen_reader: bool,
 
     /// If true, the most common glyphs (ASCII) are pre-rendered to the texture atlas.
@@ -405,7 +412,7 @@ impl Memory {
     }
 
     /// Is the keyboard focus locked on this widget? If so the focus won't move even if the user presses the tab key.
-    pub fn has_lock_focus(&mut self, id: Id) -> bool {
+    pub fn has_lock_focus(&self, id: Id) -> bool {
         if self.had_focus_last_frame(id) && self.has_focus(id) {
             self.interaction.focus.is_focus_locked
         } else {

crates/egui/src/menu.rs

@@ -31,11 +31,11 @@ pub(crate) struct BarState {
 
 impl BarState {
     fn load(ctx: &Context, bar_id: Id) -> Self {
-        ctx.data().get_temp::<Self>(bar_id).unwrap_or_default()
+        ctx.data_mut(|d| d.get_temp::<Self>(bar_id).unwrap_or_default())
     }
 
     fn store(self, ctx: &Context, bar_id: Id) {
-        ctx.data().insert_temp(bar_id, self);
+        ctx.data_mut(|d| d.insert_temp(bar_id, self));
     }
 
     /// Show a menu at pointer if primary-clicked response.
@@ -68,7 +68,7 @@ fn set_menu_style(style: &mut Style) {
     style.spacing.button_padding = vec2(2.0, 0.0);
     style.visuals.widgets.active.bg_stroke = Stroke::NONE;
     style.visuals.widgets.hovered.bg_stroke = Stroke::NONE;
-    style.visuals.widgets.inactive.bg_fill = Color32::TRANSPARENT;
+    style.visuals.widgets.inactive.weak_bg_fill = Color32::TRANSPARENT;
     style.visuals.widgets.inactive.bg_stroke = Stroke::NONE;
 }
 
@@ -100,6 +100,20 @@ pub fn menu_button<R>(
     stationary_menu_impl(ui, title, Box::new(add_contents))
 }
 
+/// Construct a top level menu with an image in a menu bar. This would be e.g. "File", "Edit" etc.
+///
+/// Responds to primary clicks.
+///
+/// Returns `None` if the menu is not open.
+pub fn menu_image_button<R>(
+    ui: &mut Ui,
+    texture_id: TextureId,
+    image_size: impl Into<Vec2>,
+    add_contents: impl FnOnce(&mut Ui) -> R,
+) -> InnerResponse<Option<R>> {
+    stationary_menu_image_impl(ui, texture_id, image_size, Box::new(add_contents))
+}
+
 /// Construct a nested sub menu in another menu.
 ///
 /// Opens on hover.
@@ -129,9 +143,10 @@ pub(crate) fn menu_ui<'c, R>(
 
     let area = Area::new(menu_id)
         .order(Order::Foreground)
+        .constrain(true)
         .fixed_pos(pos)
         .interactable(true)
-        .drag_bounds(Rect::EVERYTHING);
+        .drag_bounds(ctx.screen_rect());
     let inner_response = area.show(ctx, |ui| {
         set_menu_style(ui.style_mut());
 
@@ -166,7 +181,7 @@ fn stationary_menu_impl<'c, R>(
     let mut button = Button::new(title);
 
     if bar_state.open_menu.is_menu_open(menu_id) {
-        button = button.fill(ui.visuals().widgets.open.bg_fill);
+        button = button.fill(ui.visuals().widgets.open.weak_bg_fill);
         button = button.stroke(ui.visuals().widgets.open.bg_stroke);
     }
 
@@ -177,6 +192,25 @@ fn stationary_menu_impl<'c, R>(
     InnerResponse::new(inner.map(|r| r.inner), button_response)
 }
 
+/// Build a top level menu with an image button.
+///
+/// Responds to primary clicks.
+fn stationary_menu_image_impl<'c, R>(
+    ui: &mut Ui,
+    texture_id: TextureId,
+    image_size: impl Into<Vec2>,
+    add_contents: Box<dyn FnOnce(&mut Ui) -> R + 'c>,
+) -> InnerResponse<Option<R>> {
+    let bar_id = ui.id();
+
+    let mut bar_state = BarState::load(ui.ctx(), bar_id);
+    let button_response = ui.add(ImageButton::new(texture_id, image_size));
+    let inner = bar_state.bar_menu(&button_response, add_contents);
+
+    bar_state.store(ui.ctx(), bar_id);
+    InnerResponse::new(inner.map(|r| r.inner), button_response)
+}
+
 /// Response to secondary clicks (right-clicks) by showing the given menu.
 pub(crate) fn context_menu(
     response: &Response,
@@ -277,10 +311,9 @@ impl MenuRoot {
         root: &mut MenuRootManager,
         id: Id,
     ) -> MenuResponse {
-        // Lock the input once for the whole function call (see https://github.com/emilk/egui/pull/1380).
-        let input = response.ctx.input();
-
-        if (response.clicked() && root.is_menu_open(id)) || input.key_pressed(Key::Escape) {
+        if (response.clicked() && root.is_menu_open(id))
+            || response.ctx.input(|i| i.key_pressed(Key::Escape))
+        {
             // menu open and button clicked or esc pressed
             return MenuResponse::Close;
         } else if (response.clicked() && !root.is_menu_open(id))
@@ -288,12 +321,10 @@ impl MenuRoot {
         {
             // menu not open and button clicked
             // or button hovered while other menu is open
-            drop(input);
-
             let mut pos = response.rect.left_bottom();
             if let Some(root) = root.inner.as_mut() {
                 let menu_rect = root.menu_state.read().rect;
-                let screen_rect = response.ctx.input().screen_rect;
+                let screen_rect = response.ctx.input(|i| i.screen_rect);
 
                 if pos.y + menu_rect.height() > screen_rect.max.y {
                     pos.y = screen_rect.max.y - menu_rect.height() - response.rect.height();
@@ -305,8 +336,11 @@ impl MenuRoot {
             }
 
             return MenuResponse::Create(pos, id);
-        } else if input.pointer.any_pressed() && input.pointer.primary_down() {
-            if let Some(pos) = input.pointer.interact_pos() {
+        } else if response
+            .ctx
+            .input(|i| i.pointer.any_pressed() && i.pointer.primary_down())
+        {
+            if let Some(pos) = response.ctx.input(|i| i.pointer.interact_pos()) {
                 if let Some(root) = root.inner.as_mut() {
                     if root.id == id {
                         // pressed somewhere while this menu is open
@@ -329,26 +363,28 @@ impl MenuRoot {
         id: Id,
     ) -> MenuResponse {
         let response = response.interact(Sense::click());
-        let pointer = &response.ctx.input().pointer;
-        if pointer.any_pressed() {
-            if let Some(pos) = pointer.interact_pos() {
-                let mut destroy = false;
-                let mut in_old_menu = false;
-                if let Some(root) = root {
-                    let menu_state = root.menu_state.read();
-                    in_old_menu = menu_state.area_contains(pos);
-                    destroy = root.id == response.id;
-                }
-                if !in_old_menu {
-                    if response.hovered() && pointer.secondary_down() {
-                        return MenuResponse::Create(pos, id);
-                    } else if (response.hovered() && pointer.primary_down()) || destroy {
-                        return MenuResponse::Close;
+        response.ctx.input(|input| {
+            let pointer = &input.pointer;
+            if pointer.any_pressed() {
+                if let Some(pos) = pointer.interact_pos() {
+                    let mut destroy = false;
+                    let mut in_old_menu = false;
+                    if let Some(root) = root {
+                        let menu_state = root.menu_state.read();
+                        in_old_menu = menu_state.area_contains(pos);
+                        destroy = root.id == response.id;
+                    }
+                    if !in_old_menu {
+                        if response.hovered() && pointer.secondary_down() {
+                            return MenuResponse::Create(pos, id);
+                        } else if (response.hovered() && pointer.primary_down()) || destroy {
+                            return MenuResponse::Close;
+                        }
                     }
                 }
             }
-        }
-        MenuResponse::Stay
+            MenuResponse::Stay
+        })
     }
 
     fn handle_menu_response(root: &mut MenuRootManager, menu_response: MenuResponse) {
@@ -410,7 +446,7 @@ impl SubMenuButton {
         sub_id: Id,
     ) -> &'a WidgetVisuals {
         if menu_state.is_open(sub_id) {
-            &ui.style().visuals.widgets.hovered
+            &ui.style().visuals.widgets.open
         } else {
             ui.style().interact(response)
         }
@@ -439,7 +475,8 @@ impl SubMenuButton {
             text_galley.size().x + icon_galley.size().x,
             text_galley.size().y.max(icon_galley.size().y),
         );
-        let desired_size = text_and_icon_size + 2.0 * button_padding;
+        let mut desired_size = text_and_icon_size + 2.0 * button_padding;
+        desired_size.y = desired_size.y.at_least(ui.spacing().interact_size.y);
 
         let (rect, response) = ui.allocate_at_least(desired_size, sense);
         response.widget_info(|| {
@@ -459,7 +496,7 @@ impl SubMenuButton {
                 ui.painter().rect_filled(
                     rect.expand(visuals.expansion),
                     visuals.rounding,
-                    visuals.bg_fill,
+                    visuals.weak_bg_fill,
                 );
             }
 
@@ -571,15 +608,15 @@ impl MenuState {
 
     /// Sense button interaction opening and closing submenu.
     fn submenu_button_interaction(&mut self, ui: &mut Ui, sub_id: Id, button: &Response) {
-        let pointer = &ui.input().pointer.clone();
+        let pointer = ui.input(|i| i.pointer.clone());
         let open = self.is_open(sub_id);
-        if self.moving_towards_current_submenu(pointer) {
+        if self.moving_towards_current_submenu(&pointer) {
             // ensure to repaint once even when pointer is not moving
             ui.ctx().request_repaint();
         } else if !open && button.hovered() {
             let pos = button.rect.right_top();
             self.open_submenu(sub_id, pos);
-        } else if open && !button.hovered() && !self.hovering_current_submenu(pointer) {
+        } else if open && !button.hovered() && !self.hovering_current_submenu(&pointer) {
             self.close_submenu();
         }
     }

crates/egui/src/painter.rs

@@ -7,7 +7,6 @@ use crate::{
     Color32, Context, FontId,
 };
 use epaint::{
-    mutex::{RwLockReadGuard, RwLockWriteGuard},
     text::{Fonts, Galley},
     CircleShape, RectShape, Rounding, Shape, Stroke,
 };
@@ -105,10 +104,12 @@ impl Painter {
         &self.ctx
     }
 
-    /// Available fonts.
+    /// Read-only access to the shared [`Fonts`].
+    ///
+    /// See [`Context`] documentation for how locks work.
     #[inline(always)]
-    pub fn fonts(&self) -> RwLockReadGuard<'_, Fonts> {
-        self.ctx.fonts()
+    pub fn fonts<R>(&self, reader: impl FnOnce(&Fonts) -> R) -> R {
+        self.ctx.fonts(reader)
     }
 
     /// Where we paint
@@ -152,8 +153,9 @@ impl Painter {
 
 /// ## Low level
 impl Painter {
-    fn paint_list(&self) -> RwLockWriteGuard<'_, PaintList> {
-        RwLockWriteGuard::map(self.ctx.graphics(), |g| g.list(self.layer_id))
+    #[inline]
+    fn paint_list<R>(&self, writer: impl FnOnce(&mut PaintList) -> R) -> R {
+        self.ctx.graphics_mut(|g| writer(g.list(self.layer_id)))
     }
 
     fn transform_shape(&self, shape: &mut Shape) {
@@ -167,11 +169,11 @@ impl Painter {
     /// NOTE: all coordinates are screen coordinates!
     pub fn add(&self, shape: impl Into<Shape>) -> ShapeIdx {
         if self.fade_to_color == Some(Color32::TRANSPARENT) {
-            self.paint_list().add(self.clip_rect, Shape::Noop)
+            self.paint_list(|l| l.add(self.clip_rect, Shape::Noop))
         } else {
             let mut shape = shape.into();
             self.transform_shape(&mut shape);
-            self.paint_list().add(self.clip_rect, shape)
+            self.paint_list(|l| l.add(self.clip_rect, shape))
         }
     }
 
@@ -187,9 +189,9 @@ impl Painter {
                 self.transform_shape(&mut shape);
                 shape
             });
-            self.paint_list().extend(self.clip_rect, shapes);
+            self.paint_list(|l| l.extend(self.clip_rect, shapes));
         } else {
-            self.paint_list().extend(self.clip_rect, shapes);
+            self.paint_list(|l| l.extend(self.clip_rect, shapes));
         };
     }
 
@@ -200,7 +202,7 @@ impl Painter {
         }
         let mut shape = shape.into();
         self.transform_shape(&mut shape);
-        self.paint_list().set(idx, self.clip_rect, shape);
+        self.paint_list(|l| l.set(idx, self.clip_rect, shape));
     }
 }
 
@@ -405,7 +407,7 @@ impl Painter {
         color: crate::Color32,
         wrap_width: f32,
     ) -> Arc<Galley> {
-        self.fonts().layout(text, font_id, color, wrap_width)
+        self.fonts(|f| f.layout(text, font_id, color, wrap_width))
     }
 
     /// Will line break at `\n`.
@@ -418,7 +420,7 @@ impl Painter {
         font_id: FontId,
         color: crate::Color32,
     ) -> Arc<Galley> {
-        self.fonts().layout(text, font_id, color, f32::INFINITY)
+        self.fonts(|f| f.layout(text, font_id, color, f32::INFINITY))
     }
 
     /// Paint text that has already been layed out in a [`Galley`].

crates/egui/src/response.rs

@@ -13,6 +13,7 @@ use crate::{
 ///
 /// Whenever something gets added to a [`Ui`], a [`Response`] object is returned.
 /// [`ui.add`] returns a [`Response`], as does [`ui.button`], and all similar shortcuts.
+// TODO(emilk): we should be using bit sets instead of so many bools
 #[derive(Clone)]
 pub struct Response {
     // CONTEXT:
@@ -42,6 +43,10 @@ pub struct Response {
     #[doc(hidden)]
     pub hovered: bool,
 
+    /// The widget is highlighted via a call to [`Self::highlight`] or [`Context::highlight_widget`].
+    #[doc(hidden)]
+    pub highlighted: bool,
+
     /// The pointer clicked this thing this frame.
     #[doc(hidden)]
     pub clicked: [bool; NUM_POINTER_BUTTONS],
@@ -52,7 +57,7 @@ pub struct Response {
     pub double_clicked: [bool; NUM_POINTER_BUTTONS],
 
     /// The thing was triple-clicked.
-    pub(crate) triple_clicked: [bool; NUM_POINTER_BUTTONS],
+    pub triple_clicked: [bool; NUM_POINTER_BUTTONS],
 
     /// The widgets is being dragged
     #[doc(hidden)]
@@ -90,6 +95,7 @@ impl std::fmt::Debug for Response {
             sense,
             enabled,
             hovered,
+            highlighted,
             clicked,
             double_clicked,
             triple_clicked,
@@ -106,6 +112,7 @@ impl std::fmt::Debug for Response {
             .field("sense", sense)
             .field("enabled", enabled)
             .field("hovered", hovered)
+            .field("highlighted", highlighted)
             .field("clicked", clicked)
             .field("double_clicked", double_clicked)
             .field("triple_clicked", triple_clicked)
@@ -173,23 +180,25 @@ impl Response {
         // We do not use self.clicked(), because we want to catch all clicks within our frame,
         // even if we aren't clickable (or even enabled).
         // This is important for windows and such that should close then the user clicks elsewhere.
-        let pointer = &self.ctx.input().pointer;
+        self.ctx.input(|i| {
+            let pointer = &i.pointer;
 
-        if pointer.any_click() {
-            // We detect clicks/hover on a "interact_rect" that is slightly larger than
-            // self.rect. See Context::interact.
-            // This means we can be hovered and clicked even though `!self.rect.contains(pos)` is true,
-            // hence the extra complexity here.
-            if self.hovered() {
-                false
-            } else if let Some(pos) = pointer.interact_pos() {
-                !self.rect.contains(pos)
+            if pointer.any_click() {
+                // We detect clicks/hover on a "interact_rect" that is slightly larger than
+                // self.rect. See Context::interact.
+                // This means we can be hovered and clicked even though `!self.rect.contains(pos)` is true,
+                // hence the extra complexity here.
+                if self.hovered() {
+                    false
+                } else if let Some(pos) = pointer.interact_pos() {
+                    !self.rect.contains(pos)
+                } else {
+                    false // clicked without a pointer, weird
+                }
             } else {
-                false // clicked without a pointer, weird
+                false
             }
-        } else {
-            false
-        }
+        })
     }
 
     /// Was the widget enabled?
@@ -211,20 +220,24 @@ impl Response {
         self.hovered
     }
 
+    /// The widget is highlighted via a call to [`Self::highlight`] or [`Context::highlight_widget`].
+    #[doc(hidden)]
+    pub fn highlighted(&self) -> bool {
+        self.highlighted
+    }
+
     /// This widget has the keyboard focus (i.e. is receiving key presses).
     ///
     /// This function only returns true if the UI as a whole (e.g. window)
     /// also has the keyboard focus. That makes this function suitable
     /// for style choices, e.g. a thicker border around focused widgets.
     pub fn has_focus(&self) -> bool {
-        // Access input and memory in separate statements to prevent deadlock.
-        let has_global_focus = self.ctx.input().raw.has_focus;
-        has_global_focus && self.ctx.memory().has_focus(self.id)
+        self.ctx.input(|i| i.raw.has_focus) && self.ctx.memory(|mem| mem.has_focus(self.id))
     }
 
     /// True if this widget has keyboard focus this frame, but didn't last frame.
     pub fn gained_focus(&self) -> bool {
-        self.ctx.memory().gained_focus(self.id)
+        self.ctx.memory(|mem| mem.gained_focus(self.id))
     }
 
     /// The widget had keyboard focus and lost it,
@@ -236,29 +249,29 @@ impl Response {
     /// # let mut my_text = String::new();
     /// # fn do_request(_: &str) {}
     /// let response = ui.text_edit_singleline(&mut my_text);
-    /// if response.lost_focus() && ui.input().key_pressed(egui::Key::Enter) {
+    /// if response.lost_focus() && ui.input(|i| i.key_pressed(egui::Key::Enter)) {
     ///     do_request(&my_text);
     /// }
     /// # });
     /// ```
     pub fn lost_focus(&self) -> bool {
-        self.ctx.memory().lost_focus(self.id)
+        self.ctx.memory(|mem| mem.lost_focus(self.id))
     }
 
     /// Request that this widget get keyboard focus.
     pub fn request_focus(&self) {
-        self.ctx.memory().request_focus(self.id);
+        self.ctx.memory_mut(|mem| mem.request_focus(self.id));
     }
 
     /// Surrender keyboard focus for this widget.
     pub fn surrender_focus(&self) {
-        self.ctx.memory().surrender_focus(self.id);
+        self.ctx.memory_mut(|mem| mem.surrender_focus(self.id));
     }
 
     /// The widgets is being dragged.
     ///
     /// To find out which button(s), query [`crate::PointerState::button_down`]
-    /// (`ui.input().pointer.button_down(…)`).
+    /// (`ui.input(|i| i.pointer.button_down(…))`).
     ///
     /// Note that the widget must be sensing drags with [`Sense::drag`].
     /// [`crate::DragValue`] senses drags; [`crate::Label`] does not (unless you call [`crate::Label::sense`]).
@@ -270,12 +283,17 @@ impl Response {
     }
 
     pub fn dragged_by(&self, button: PointerButton) -> bool {
-        self.dragged() && self.ctx.input().pointer.button_down(button)
+        self.dragged() && self.ctx.input(|i| i.pointer.button_down(button))
     }
 
     /// Did a drag on this widgets begin this frame?
     pub fn drag_started(&self) -> bool {
-        self.dragged && self.ctx.input().pointer.any_pressed()
+        self.dragged && self.ctx.input(|i| i.pointer.any_pressed())
+    }
+
+    /// Did a drag on this widgets by the button begin this frame?
+    pub fn drag_started_by(&self, button: PointerButton) -> bool {
+        self.drag_started() && self.ctx.input(|i| i.pointer.button_pressed(button))
     }
 
     /// The widget was being dragged, but now it has been released.
@@ -283,10 +301,15 @@ impl Response {
         self.drag_released
     }
 
+    /// The widget was being dragged by the button, but now it has been released.
+    pub fn drag_released_by(&self, button: PointerButton) -> bool {
+        self.drag_released() && self.ctx.input(|i| i.pointer.button_released(button))
+    }
+
     /// If dragged, how many points were we dragged and in what direction?
     pub fn drag_delta(&self) -> Vec2 {
         if self.dragged() {
-            self.ctx.input().pointer.delta()
+            self.ctx.input(|i| i.pointer.delta())
         } else {
             Vec2::ZERO
         }
@@ -302,7 +325,7 @@ impl Response {
     /// None if the pointer is outside the response area.
     pub fn hover_pos(&self) -> Option<Pos2> {
         if self.hovered() {
-            self.ctx.input().pointer.hover_pos()
+            self.ctx.input(|i| i.pointer.hover_pos())
         } else {
             None
         }
@@ -392,11 +415,11 @@ impl Response {
     }
 
     fn should_show_hover_ui(&self) -> bool {
-        if self.ctx.memory().everything_is_visible() {
+        if self.ctx.memory(|mem| mem.everything_is_visible()) {
             return true;
         }
 
-        if !self.hovered || !self.ctx.input().pointer.has_pointer() {
+        if !self.hovered || !self.ctx.input(|i| i.pointer.has_pointer()) {
             return false;
         }
 
@@ -404,8 +427,7 @@ impl Response {
             // We only show the tooltip when the mouse pointer is still,
             // but once shown we keep showing it until the mouse leaves the parent.
 
-            let is_pointer_still = self.ctx.input().pointer.is_still();
-            if !is_pointer_still && !self.is_tooltip_open() {
+            if !self.ctx.input(|i| i.pointer.is_still()) && !self.is_tooltip_open() {
                 // wait for mouse to stop
                 self.ctx.request_repaint();
                 return false;
@@ -414,8 +436,9 @@ impl Response {
 
         // We don't want tooltips of things while we are dragging them,
         // but we do want tooltips while holding down on an item on a touch screen.
-        if self.ctx.input().pointer.any_down()
-            && self.ctx.input().pointer.has_moved_too_much_for_a_click
+        if self
+            .ctx
+            .input(|i| i.pointer.any_down() && i.pointer.has_moved_too_much_for_a_click)
         {
             return false;
         }
@@ -444,6 +467,17 @@ impl Response {
         })
     }
 
+    /// Highlight this widget, to make it look like it is hovered, even if it isn't.
+    ///
+    /// The highlight takes on frame to take effect if you call this after the widget has been fully rendered.
+    ///
+    /// See also [`Context::highlight_widget`].
+    pub fn highlight(mut self) -> Self {
+        self.ctx.highlight_widget(self.id);
+        self.highlighted = true;
+        self
+    }
+
     /// Show this text when hovering if the widget is disabled.
     pub fn on_disabled_hover_text(self, text: impl Into<WidgetText>) -> Self {
         self.on_disabled_hover_ui(|ui| {
@@ -454,7 +488,7 @@ impl Response {
     /// When hovered, use this icon for the mouse cursor.
     pub fn on_hover_cursor(self, cursor: CursorIcon) -> Self {
         if self.hovered() {
-            self.ctx.output().cursor_icon = cursor;
+            self.ctx.set_cursor_icon(cursor);
         }
         self
     }
@@ -462,7 +496,7 @@ impl Response {
     /// When hovered or dragged, use this icon for the mouse cursor.
     pub fn on_hover_and_drag_cursor(self, cursor: CursorIcon) -> Self {
         if self.hovered() || self.dragged() {
-            self.ctx.output().cursor_icon = cursor;
+            self.ctx.set_cursor_icon(cursor);
         }
         self
     }
@@ -511,8 +545,10 @@ impl Response {
     /// # });
     /// ```
     pub fn scroll_to_me(&self, align: Option<Align>) {
-        self.ctx.frame_state().scroll_target[0] = Some((self.rect.x_range(), align));
-        self.ctx.frame_state().scroll_target[1] = Some((self.rect.y_range(), align));
+        self.ctx.frame_state_mut(|state| {
+            state.scroll_target[0] = Some((self.rect.x_range(), align));
+            state.scroll_target[1] = Some((self.rect.y_range(), align));
+        });
     }
 
     /// For accessibility.
@@ -537,47 +573,47 @@ impl Response {
             self.output_event(event);
         } else {
             #[cfg(feature = "accesskit")]
-            if let Some(mut node) = self.ctx.accesskit_node(self.id) {
-                self.fill_accesskit_node_from_widget_info(&mut node, make_info());
-            }
+            self.ctx.accesskit_node_builder(self.id, |builder| {
+                self.fill_accesskit_node_from_widget_info(builder, make_info());
+            });
         }
     }
 
     pub fn output_event(&self, event: crate::output::OutputEvent) {
         #[cfg(feature = "accesskit")]
-        if let Some(mut node) = self.ctx.accesskit_node(self.id) {
-            self.fill_accesskit_node_from_widget_info(&mut node, event.widget_info().clone());
-        }
-        self.ctx.output().events.push(event);
+        self.ctx.accesskit_node_builder(self.id, |builder| {
+            self.fill_accesskit_node_from_widget_info(builder, event.widget_info().clone());
+        });
+        self.ctx.output_mut(|o| o.events.push(event));
     }
 
     #[cfg(feature = "accesskit")]
-    pub(crate) fn fill_accesskit_node_common(&self, node: &mut accesskit::Node) {
-        node.bounds = Some(accesskit::kurbo::Rect {
+    pub(crate) fn fill_accesskit_node_common(&self, builder: &mut accesskit::NodeBuilder) {
+        builder.set_bounds(accesskit::Rect {
             x0: self.rect.min.x.into(),
             y0: self.rect.min.y.into(),
             x1: self.rect.max.x.into(),
             y1: self.rect.max.y.into(),
         });
         if self.sense.focusable {
-            node.focusable = true;
+            builder.add_action(accesskit::Action::Focus);
         }
-        if self.sense.click && node.default_action_verb.is_none() {
-            node.default_action_verb = Some(accesskit::DefaultActionVerb::Click);
+        if self.sense.click && builder.default_action_verb().is_none() {
+            builder.set_default_action_verb(accesskit::DefaultActionVerb::Click);
         }
     }
 
     #[cfg(feature = "accesskit")]
     fn fill_accesskit_node_from_widget_info(
         &self,
-        node: &mut accesskit::Node,
+        builder: &mut accesskit::NodeBuilder,
         info: crate::WidgetInfo,
     ) {
         use crate::WidgetType;
         use accesskit::{CheckedState, Role};
 
-        self.fill_accesskit_node_common(node);
-        node.role = match info.typ {
+        self.fill_accesskit_node_common(builder);
+        builder.set_role(match info.typ {
             WidgetType::Label => Role::StaticText,
             WidgetType::Link => Role::Link,
             WidgetType::TextEdit => Role::TextField,
@@ -592,18 +628,18 @@ impl Response {
             WidgetType::DragValue => Role::SpinButton,
             WidgetType::ColorButton => Role::ColorWell,
             WidgetType::Other => Role::Unknown,
-        };
+        });
         if let Some(label) = info.label {
-            node.name = Some(label.into());
+            builder.set_name(label);
         }
         if let Some(value) = info.current_text_value {
-            node.value = Some(value.into());
+            builder.set_value(value);
         }
         if let Some(value) = info.value {
-            node.numeric_value = Some(value);
+            builder.set_numeric_value(value);
         }
         if let Some(selected) = info.selected {
-            node.checked_state = Some(if selected {
+            builder.set_checked_state(if selected {
                 CheckedState::True
             } else {
                 CheckedState::False
@@ -626,9 +662,9 @@ impl Response {
     /// ```
     pub fn labelled_by(self, id: Id) -> Self {
         #[cfg(feature = "accesskit")]
-        if let Some(mut node) = self.ctx.accesskit_node(self.id) {
-            node.labelled_by.push(id.accesskit_id());
-        }
+        self.ctx.accesskit_node_builder(self.id, |builder| {
+            builder.push_labelled_by(id.accesskit_id());
+        });
         #[cfg(not(feature = "accesskit"))]
         {
             let _ = id;
@@ -677,6 +713,7 @@ impl Response {
             sense: self.sense.union(other.sense),
             enabled: self.enabled || other.enabled,
             hovered: self.hovered || other.hovered,
+            highlighted: self.highlighted || other.highlighted,
             clicked: [
                 self.clicked[0] || other.clicked[0],
                 self.clicked[1] || other.clicked[1],
@@ -708,6 +745,13 @@ impl Response {
     }
 }
 
+impl Response {
+    /// Returns a response with a modified [`Self::rect`].
+    pub fn with_new_rect(self, rect: Rect) -> Self {
+        Self { rect, ..self }
+    }
+}
+
 /// To summarize the response from many widgets you can use this pattern:
 ///
 /// ```

crates/egui/src/style.rs

@@ -174,6 +174,9 @@ pub struct Style {
     /// ```
     pub text_styles: BTreeMap<TextStyle, FontId>,
 
+    /// The style to use for [`DragValue`] text.
+    pub drag_value_text_style: TextStyle,
+
     /// If set, labels buttons wtc will use this to determine whether or not
     /// to wrap the text at the right edge of the [`Ui`] they are in.
     /// By default this is `None`.
@@ -216,6 +219,7 @@ impl Style {
     pub fn interact_selectable(&self, response: &Response, selected: bool) -> WidgetVisuals {
         let mut visuals = *self.visuals.widgets.style(response);
         if selected {
+            visuals.weak_bg_fill = self.visuals.selection.bg_fill;
             visuals.bg_fill = self.visuals.selection.bg_fill;
             // visuals.bg_stroke = self.visuals.selection.stroke;
             visuals.fg_stroke = self.visuals.selection.stroke;
@@ -264,8 +268,11 @@ pub struct Spacing {
     /// Anything clickable should be (at least) this size.
     pub interact_size: Vec2, // TODO(emilk): rename min_interact_size ?
 
-    /// Default width of a [`Slider`] and [`ComboBox`](crate::ComboBox).
-    pub slider_width: f32, // TODO(emilk): rename big_interact_size ?
+    /// Default width of a [`Slider`].
+    pub slider_width: f32,
+
+    /// Default (minimum) width of a [`ComboBox`](crate::ComboBox).
+    pub combo_width: f32,
 
     /// Default width of a [`TextEdit`].
     pub text_edit_width: f32,
@@ -293,8 +300,12 @@ pub struct Spacing {
 
     pub scroll_bar_width: f32,
 
+    /// Make sure the scroll handle is at least this big
+    pub scroll_handle_min_length: f32,
+
     /// Margin between contents and scroll bar.
     pub scroll_bar_inner_margin: f32,
+
     /// Margin between scroll bar and the outer container (e.g. right of a vertical scroll bar).
     pub scroll_bar_outer_margin: f32,
 }
@@ -481,6 +492,7 @@ pub struct Visuals {
     pub resize_corner_size: f32,
 
     pub text_cursor_width: f32,
+
     /// show where the text cursor would be if you clicked
     pub text_cursor_preview: bool,
 
@@ -493,9 +505,17 @@ pub struct Visuals {
     /// Show a background behind collapsing headers.
     pub collapsing_header_frame: bool,
 
+    /// Draw a vertical lien left of indented region, in e.g. [`crate::CollapsingHeader`].
+    pub indent_has_left_vline: bool,
+
     /// Wether or not Grids and Tables should be striped by default
     /// (have alternating rows differently colored).
     pub striped: bool,
+
+    /// Show trailing color behind the circle of a [`Slider`]. Default is OFF.
+    ///
+    /// Enabling this will affect ALL sliders, and can be enabled/disabled per slider with [`Slider::trailing_fill`].
+    pub slider_trailing_fill: bool,
 }
 
 impl Visuals {
@@ -533,7 +553,7 @@ impl Visuals {
     // TODO(emilk): replace with an alpha
     #[inline(always)]
     pub fn fade_out_to_color(&self) -> Color32 {
-        self.widgets.noninteractive.bg_fill
+        self.widgets.noninteractive.weak_bg_fill
     }
 
     /// Returned a "grayed out" version of the given color.
@@ -566,7 +586,9 @@ pub struct Widgets {
     /// The style of an interactive widget, such as a button, at rest.
     pub inactive: WidgetVisuals,
 
-    /// The style of an interactive widget while you hover it.
+    /// The style of an interactive widget while you hover it, or when it is highlighted.
+    ///
+    /// See [`Response::hovered`], [`Response::highlighted`] and [`Response::highlight`].
     pub hovered: WidgetVisuals,
 
     /// The style of an interactive widget as you are clicking or dragging it.
@@ -582,7 +604,7 @@ impl Widgets {
             &self.noninteractive
         } else if response.is_pointer_button_down_on() || response.has_focus() {
             &self.active
-        } else if response.hovered() {
+        } else if response.hovered() || response.highlighted() {
             &self.hovered
         } else {
             &self.inactive
@@ -594,9 +616,17 @@ impl Widgets {
 #[derive(Clone, Copy, Debug, PartialEq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 pub struct WidgetVisuals {
-    /// Background color of widget.
+    /// Background color of widgets that must have a background fill,
+    /// such as the slider background, a checkbox background, or a radio button background.
+    ///
+    /// Must never be [`Color32::TRANSPARENT`].
     pub bg_fill: Color32,
 
+    /// Background color of widgets that can _optionally_ have a background fill, such as buttons.
+    ///
+    /// May be [`Color32::TRANSPARENT`].
+    pub weak_bg_fill: Color32,
+
     /// For surrounding rectangle of things that need it,
     /// like buttons, the box of the checkbox, etc.
     /// Should maybe be called `frame_stroke`.
@@ -663,6 +693,7 @@ impl Default for Style {
             override_font_id: None,
             override_text_style: None,
             text_styles: default_text_styles(),
+            drag_value_text_style: TextStyle::Button,
             wrap: None,
             spacing: Spacing::default(),
             interaction: Interaction::default(),
@@ -684,6 +715,7 @@ impl Default for Spacing {
             indent: 18.0, // match checkbox/radio-button with `button_padding.x + icon_width + icon_spacing`
             interact_size: vec2(40.0, 18.0),
             slider_width: 100.0,
+            combo_width: 100.0,
             text_edit_width: 280.0,
             icon_width: 14.0,
             icon_width_inner: 8.0,
@@ -691,6 +723,7 @@ impl Default for Spacing {
             tooltip_width: 600.0,
             combo_height: 200.0,
             scroll_bar_width: 8.0,
+            scroll_handle_min_length: 12.0,
             scroll_bar_inner_margin: 4.0,
             scroll_bar_outer_margin: 0.0,
             indent_ends_with_horizontal_line: false,
@@ -717,8 +750,8 @@ impl Visuals {
             widgets: Widgets::default(),
             selection: Selection::default(),
             hyperlink_color: Color32::from_rgb(90, 170, 255),
-            faint_bg_color: Color32::from_gray(35),
-            extreme_bg_color: Color32::from_gray(10), // e.g. TextEdit background
+            faint_bg_color: Color32::from_additive_luminance(5), // visible, but barely so
+            extreme_bg_color: Color32::from_gray(10),            // e.g. TextEdit background
             code_bg_color: Color32::from_gray(64),
             warn_fg_color: Color32::from_rgb(255, 143, 0), // orange
             error_fg_color: Color32::from_rgb(255, 0, 0),  // red
@@ -739,8 +772,11 @@ impl Visuals {
             clip_rect_margin: 3.0, // should be at least half the size of the widest frame stroke + max WidgetVisuals::expansion
             button_frame: true,
             collapsing_header_frame: false,
+            indent_has_left_vline: true,
 
             striped: false,
+
+            slider_trailing_fill: false,
         }
     }
 
@@ -751,8 +787,8 @@ impl Visuals {
             widgets: Widgets::light(),
             selection: Selection::light(),
             hyperlink_color: Color32::from_rgb(0, 155, 255),
-            faint_bg_color: Color32::from_gray(242),
-            extreme_bg_color: Color32::from_gray(255), // e.g. TextEdit background
+            faint_bg_color: Color32::from_additive_luminance(5), // visible, but barely so
+            extreme_bg_color: Color32::from_gray(255),           // e.g. TextEdit background
             code_bg_color: Color32::from_gray(230),
             warn_fg_color: Color32::from_rgb(255, 100, 0), // slightly orange red. it's difficult to find a warning color that pops on bright background.
             error_fg_color: Color32::from_rgb(255, 0, 0),  // red
@@ -801,6 +837,7 @@ impl Widgets {
     pub fn dark() -> Self {
         Self {
             noninteractive: WidgetVisuals {
+                weak_bg_fill: Color32::from_gray(27),
                 bg_fill: Color32::from_gray(27),
                 bg_stroke: Stroke::new(1.0, Color32::from_gray(60)), // separators, indentation lines
                 fg_stroke: Stroke::new(1.0, Color32::from_gray(140)), // normal text color
@@ -808,13 +845,15 @@ impl Widgets {
                 expansion: 0.0,
             },
             inactive: WidgetVisuals {
-                bg_fill: Color32::from_gray(60), // button background
+                weak_bg_fill: Color32::from_gray(60), // button background
+                bg_fill: Color32::from_gray(60),      // checkbox background
                 bg_stroke: Default::default(),
                 fg_stroke: Stroke::new(1.0, Color32::from_gray(180)), // button text
                 rounding: Rounding::same(2.0),
                 expansion: 0.0,
             },
             hovered: WidgetVisuals {
+                weak_bg_fill: Color32::from_gray(70),
                 bg_fill: Color32::from_gray(70),
                 bg_stroke: Stroke::new(1.0, Color32::from_gray(150)), // e.g. hover over window edge or button
                 fg_stroke: Stroke::new(1.5, Color32::from_gray(240)),
@@ -822,6 +861,7 @@ impl Widgets {
                 expansion: 1.0,
             },
             active: WidgetVisuals {
+                weak_bg_fill: Color32::from_gray(55),
                 bg_fill: Color32::from_gray(55),
                 bg_stroke: Stroke::new(1.0, Color32::WHITE),
                 fg_stroke: Stroke::new(2.0, Color32::WHITE),
@@ -829,6 +869,7 @@ impl Widgets {
                 expansion: 1.0,
             },
             open: WidgetVisuals {
+                weak_bg_fill: Color32::from_gray(27),
                 bg_fill: Color32::from_gray(27),
                 bg_stroke: Stroke::new(1.0, Color32::from_gray(60)),
                 fg_stroke: Stroke::new(1.0, Color32::from_gray(210)),
@@ -841,6 +882,7 @@ impl Widgets {
     pub fn light() -> Self {
         Self {
             noninteractive: WidgetVisuals {
+                weak_bg_fill: Color32::from_gray(248),
                 bg_fill: Color32::from_gray(248),
                 bg_stroke: Stroke::new(1.0, Color32::from_gray(190)), // separators, indentation lines
                 fg_stroke: Stroke::new(1.0, Color32::from_gray(80)),  // normal text color
@@ -848,13 +890,15 @@ impl Widgets {
                 expansion: 0.0,
             },
             inactive: WidgetVisuals {
-                bg_fill: Color32::from_gray(230), // button background
+                weak_bg_fill: Color32::from_gray(230), // button background
+                bg_fill: Color32::from_gray(230),      // checkbox background
                 bg_stroke: Default::default(),
                 fg_stroke: Stroke::new(1.0, Color32::from_gray(60)), // button text
                 rounding: Rounding::same(2.0),
                 expansion: 0.0,
             },
             hovered: WidgetVisuals {
+                weak_bg_fill: Color32::from_gray(220),
                 bg_fill: Color32::from_gray(220),
                 bg_stroke: Stroke::new(1.0, Color32::from_gray(105)), // e.g. hover over window edge or button
                 fg_stroke: Stroke::new(1.5, Color32::BLACK),
@@ -862,6 +906,7 @@ impl Widgets {
                 expansion: 1.0,
             },
             active: WidgetVisuals {
+                weak_bg_fill: Color32::from_gray(165),
                 bg_fill: Color32::from_gray(165),
                 bg_stroke: Stroke::new(1.0, Color32::BLACK),
                 fg_stroke: Stroke::new(2.0, Color32::BLACK),
@@ -869,6 +914,7 @@ impl Widgets {
                 expansion: 1.0,
             },
             open: WidgetVisuals {
+                weak_bg_fill: Color32::from_gray(220),
                 bg_fill: Color32::from_gray(220),
                 bg_stroke: Stroke::new(1.0, Color32::from_gray(160)),
                 fg_stroke: Stroke::new(1.0, Color32::BLACK),
@@ -895,6 +941,7 @@ impl Style {
             override_font_id,
             override_text_style,
             text_styles,
+            drag_value_text_style,
             wrap: _,
             spacing,
             interaction,
@@ -936,6 +983,19 @@ impl Style {
                 });
             ui.end_row();
 
+            ui.label("Text style of DragValue:");
+            crate::ComboBox::from_id_source("drag_value_text_style")
+                .selected_text(drag_value_text_style.to_string())
+                .show_ui(ui, |ui| {
+                    let all_text_styles = ui.style().text_styles();
+                    for style in all_text_styles {
+                        let text =
+                            crate::RichText::new(style.to_string()).text_style(style.clone());
+                        ui.selectable_value(drag_value_text_style, style, text);
+                    }
+                });
+            ui.end_row();
+
             ui.label("Animation duration:");
             ui.add(
                 Slider::new(animation_time, 0.0..=1.0)
@@ -984,6 +1044,7 @@ impl Spacing {
             indent,
             interact_size,
             slider_width,
+            combo_width,
             text_edit_width,
             icon_width,
             icon_width_inner,
@@ -992,6 +1053,7 @@ impl Spacing {
             indent_ends_with_horizontal_line,
             combo_height,
             scroll_bar_width,
+            scroll_handle_min_length,
             scroll_bar_inner_margin,
             scroll_bar_outer_margin,
         } = self;
@@ -1012,6 +1074,10 @@ impl Spacing {
             ui.add(DragValue::new(slider_width).clamp_range(0.0..=1000.0));
             ui.label("Slider width");
         });
+        ui.horizontal(|ui| {
+            ui.add(DragValue::new(combo_width).clamp_range(0.0..=1000.0));
+            ui.label("ComboBox width");
+        });
         ui.horizontal(|ui| {
             ui.add(DragValue::new(text_edit_width).clamp_range(0.0..=1000.0));
             ui.label("TextEdit width");
@@ -1020,6 +1086,10 @@ impl Spacing {
             ui.add(DragValue::new(scroll_bar_width).clamp_range(0.0..=32.0));
             ui.label("Scroll-bar width");
         });
+        ui.horizontal(|ui| {
+            ui.add(DragValue::new(scroll_handle_min_length).clamp_range(0.0..=32.0));
+            ui.label("Scroll-bar handle min length");
+        });
         ui.horizontal(|ui| {
             ui.add(DragValue::new(scroll_bar_inner_margin).clamp_range(0.0..=32.0));
             ui.label("Scroll-bar inner margin");
@@ -1185,13 +1255,17 @@ impl Selection {
 impl WidgetVisuals {
     pub fn ui(&mut self, ui: &mut crate::Ui) {
         let Self {
-            bg_fill,
+            weak_bg_fill,
+            bg_fill: mandatory_bg_fill,
             bg_stroke,
             rounding,
             fg_stroke,
             expansion,
         } = self;
-        ui_color(ui, bg_fill, "background fill");
+        ui_color(ui, weak_bg_fill, "optional background fill")
+            .on_hover_text("For buttons, combo-boxes, etc");
+        ui_color(ui, mandatory_bg_fill, "mandatory background fill")
+            .on_hover_text("For checkboxes, sliders, etc");
         stroke_ui(ui, bg_stroke, "background stroke");
 
         rounding_ui(ui, rounding);
@@ -1265,12 +1339,15 @@ impl Visuals {
             clip_rect_margin,
             button_frame,
             collapsing_header_frame,
+            indent_has_left_vline,
 
             striped,
+
+            slider_trailing_fill,
         } = self;
 
         ui.collapsing("Background Colors", |ui| {
-            ui_color(ui, &mut widgets.inactive.bg_fill, "Buttons");
+            ui_color(ui, &mut widgets.inactive.weak_bg_fill, "Buttons");
             ui_color(ui, window_fill, "Windows");
             ui_color(ui, panel_fill, "Panels");
             ui_color(ui, faint_bg_color, "Faint accent").on_hover_text(
@@ -1322,9 +1399,15 @@ impl Visuals {
 
         ui.checkbox(button_frame, "Button has a frame");
         ui.checkbox(collapsing_header_frame, "Collapsing header has a frame");
+        ui.checkbox(
+            indent_has_left_vline,
+            "Paint a vertical line to the left of indented regions",
+        );
 
         ui.checkbox(striped, "By default, add stripes to grids and tables?");
 
+        ui.checkbox(slider_trailing_fill, "Add trailing color to sliders");
+
         ui.vertical_centered(|ui| reset_button(ui, self));
     }
 }

crates/egui/src/ui.rs

@@ -3,11 +3,11 @@
 use std::hash::Hash;
 use std::sync::Arc;
 
-use epaint::mutex::{RwLock, RwLockReadGuard, RwLockWriteGuard};
+use epaint::mutex::RwLock;
 
 use crate::{
     containers::*, ecolor::*, epaint::text::Fonts, layout::*, menu::MenuState, placer::Placer,
-    widgets::*, *,
+    util::IdTypeMap, widgets::*, *,
 };
 
 // ----------------------------------------------------------------------------
@@ -314,84 +314,9 @@ impl Ui {
         self.painter().layer_id()
     }
 
-    /// The [`InputState`] of the [`Context`] associated with this [`Ui`].
-    /// Equivalent to `.ctx().input()`.
-    ///
-    /// Note that this locks the [`Context`], so be careful with if-let bindings:
-    ///
-    /// ```
-    /// # egui::__run_test_ui(|ui| {
-    /// if let Some(pos) = { ui.input().pointer.hover_pos() } {
-    ///     // This is fine!
-    /// }
-    ///
-    /// let pos = ui.input().pointer.hover_pos();
-    /// if let Some(pos) = pos {
-    ///     // This is also fine!
-    /// }
-    ///
-    /// if let Some(pos) = ui.input().pointer.hover_pos() {
-    ///     // ⚠️ Using `ui` again here will lead to a dead-lock!
-    /// }
-    /// # });
-    /// ```
-    #[inline]
-    pub fn input(&self) -> RwLockReadGuard<'_, InputState> {
-        self.ctx().input()
-    }
-
-    /// The [`InputState`] of the [`Context`] associated with this [`Ui`].
-    /// Equivalent to `.ctx().input_mut()`.
-    ///
-    /// Note that this locks the [`Context`], so be careful with if-let bindings
-    /// like for [`Self::input()`].
-    /// ```
-    /// # egui::__run_test_ui(|ui| {
-    /// ui.input_mut().consume_key(egui::Modifiers::default(), egui::Key::Enter);
-    /// # });
-    /// ```
-    #[inline]
-    pub fn input_mut(&self) -> RwLockWriteGuard<'_, InputState> {
-        self.ctx().input_mut()
-    }
-
-    /// The [`Memory`] of the [`Context`] associated with this ui.
-    /// Equivalent to `.ctx().memory()`.
-    #[inline]
-    pub fn memory(&self) -> RwLockWriteGuard<'_, Memory> {
-        self.ctx().memory()
-    }
-
-    /// Stores superficial widget state.
-    #[inline]
-    pub fn data(&self) -> RwLockWriteGuard<'_, crate::util::IdTypeMap> {
-        self.ctx().data()
-    }
-
-    /// The [`PlatformOutput`] of the [`Context`] associated with this ui.
-    /// Equivalent to `.ctx().output()`.
-    ///
-    /// ```
-    /// # egui::__run_test_ui(|ui| {
-    /// if ui.button("📋").clicked() {
-    ///     ui.output().copied_text = "some_text".to_string();
-    /// }
-    /// # });
-    #[inline]
-    pub fn output(&self) -> RwLockWriteGuard<'_, PlatformOutput> {
-        self.ctx().output()
-    }
-
-    /// The [`Fonts`] of the [`Context`] associated with this ui.
-    /// Equivalent to `.ctx().fonts()`.
-    #[inline]
-    pub fn fonts(&self) -> RwLockReadGuard<'_, Fonts> {
-        self.ctx().fonts()
-    }
-
     /// The height of text of this text style
     pub fn text_style_height(&self, style: &TextStyle) -> f32 {
-        self.fonts().row_height(&style.resolve(self.style()))
+        self.fonts(|f| f.row_height(&style.resolve(self.style())))
     }
 
     /// Screen-space rectangle for clipping what we paint in this ui.
@@ -413,6 +338,87 @@ impl Ui {
     }
 }
 
+/// # Helpers for accessing the underlying [`Context`].
+/// These functions all lock the [`Context`] owned by this [`Ui`].
+/// Please see the documentation of [`Context`] for how locking works!
+impl Ui {
+    /// Read-only access to the shared [`InputState`].
+    ///
+    /// ```
+    /// # egui::__run_test_ui(|ui| {
+    /// if ui.input(|i| i.key_pressed(egui::Key::A)) {
+    ///     // …
+    /// }
+    /// # });
+    /// ```
+    #[inline]
+    pub fn input<R>(&self, reader: impl FnOnce(&InputState) -> R) -> R {
+        self.ctx().input(reader)
+    }
+
+    /// Read-write access to the shared [`InputState`].
+    #[inline]
+    pub fn input_mut<R>(&self, writer: impl FnOnce(&mut InputState) -> R) -> R {
+        self.ctx().input_mut(writer)
+    }
+
+    /// Read-only access to the shared [`Memory`].
+    #[inline]
+    pub fn memory<R>(&self, reader: impl FnOnce(&Memory) -> R) -> R {
+        self.ctx().memory(reader)
+    }
+
+    /// Read-write access to the shared [`Memory`].
+    #[inline]
+    pub fn memory_mut<R>(&self, writer: impl FnOnce(&mut Memory) -> R) -> R {
+        self.ctx().memory_mut(writer)
+    }
+
+    /// Read-only access to the shared [`IdTypeMap`], which stores superficial widget state.
+    #[inline]
+    pub fn data<R>(&self, reader: impl FnOnce(&IdTypeMap) -> R) -> R {
+        self.ctx().data(reader)
+    }
+
+    /// Read-write access to the shared [`IdTypeMap`], which stores superficial widget state.
+    #[inline]
+    pub fn data_mut<R>(&self, writer: impl FnOnce(&mut IdTypeMap) -> R) -> R {
+        self.ctx().data_mut(writer)
+    }
+
+    /// Read-only access to the shared [`PlatformOutput`].
+    ///
+    /// This is what egui outputs each frame.
+    ///
+    /// ```
+    /// # let mut ctx = egui::Context::default();
+    /// ctx.output_mut(|o| o.cursor_icon = egui::CursorIcon::Progress);
+    /// ```
+    #[inline]
+    pub fn output<R>(&self, reader: impl FnOnce(&PlatformOutput) -> R) -> R {
+        self.ctx().output(reader)
+    }
+
+    /// Read-write access to the shared [`PlatformOutput`].
+    ///
+    /// This is what egui outputs each frame.
+    ///
+    /// ```
+    /// # let mut ctx = egui::Context::default();
+    /// ctx.output_mut(|o| o.cursor_icon = egui::CursorIcon::Progress);
+    /// ```
+    #[inline]
+    pub fn output_mut<R>(&self, writer: impl FnOnce(&mut PlatformOutput) -> R) -> R {
+        self.ctx().output_mut(writer)
+    }
+
+    /// Read-only access to [`Fonts`].
+    #[inline]
+    pub fn fonts<R>(&self, reader: impl FnOnce(&Fonts) -> R) -> R {
+        self.ctx().fonts(reader)
+    }
+}
+
 // ------------------------------------------------------------------------
 
 /// # Sizes etc
@@ -961,7 +967,8 @@ impl Ui {
     pub fn scroll_to_rect(&self, rect: Rect, align: Option<Align>) {
         for d in 0..2 {
             let range = rect.min[d]..=rect.max[d];
-            self.ctx().frame_state().scroll_target[d] = Some((range, align));
+            self.ctx()
+                .frame_state_mut(|state| state.scroll_target[d] = Some((range, align)));
         }
     }
 
@@ -990,7 +997,8 @@ impl Ui {
         let target = self.next_widget_position();
         for d in 0..2 {
             let target = target[d];
-            self.ctx().frame_state().scroll_target[d] = Some((target..=target, align));
+            self.ctx()
+                .frame_state_mut(|state| state.scroll_target[d] = Some((target..=target, align)));
         }
     }
 
@@ -1022,7 +1030,8 @@ impl Ui {
     /// # });
     /// ```
     pub fn scroll_with_delta(&self, delta: Vec2) {
-        self.ctx().frame_state().scroll_delta += delta;
+        self.ctx()
+            .frame_state_mut(|state| state.scroll_delta += delta);
     }
 }
 
@@ -1563,7 +1572,7 @@ impl Ui {
     /// }
     /// ```
     ///
-    /// Se also [`crate::Image`] and [`crate::ImageButton`].
+    /// See also [`crate::Image`] and [`crate::ImageButton`].
     #[inline]
     pub fn image(&mut self, texture_id: impl Into<TextureId>, size: impl Into<Vec2>) -> Response {
         Image::new(texture_id, size).ui(self)
@@ -1780,24 +1789,31 @@ impl Ui {
         };
         let ret = add_contents(&mut child_ui);
 
+        let left_vline = self.visuals().indent_has_left_vline;
         let end_with_horizontal_line = self.spacing().indent_ends_with_horizontal_line;
 
-        if end_with_horizontal_line {
-            child_ui.add_space(4.0);
-        }
+        if left_vline || end_with_horizontal_line {
+            if end_with_horizontal_line {
+                child_ui.add_space(4.0);
+            }
 
-        // draw a faint line on the left to mark the indented section
-        let stroke = self.visuals().widgets.noninteractive.bg_stroke;
-        let left_top = child_rect.min - 0.5 * indent * Vec2::X;
-        let left_top = self.painter().round_pos_to_pixels(left_top);
-        let left_bottom = pos2(left_top.x, child_ui.min_rect().bottom() - 2.0);
-        let left_bottom = self.painter().round_pos_to_pixels(left_bottom);
-        self.painter.line_segment([left_top, left_bottom], stroke);
-        if end_with_horizontal_line {
-            let fudge = 2.0; // looks nicer with button rounding in collapsing headers
-            let right_bottom = pos2(child_ui.min_rect().right() - fudge, left_bottom.y);
-            self.painter
-                .line_segment([left_bottom, right_bottom], stroke);
+            let stroke = self.visuals().widgets.noninteractive.bg_stroke;
+            let left_top = child_rect.min - 0.5 * indent * Vec2::X;
+            let left_top = self.painter().round_pos_to_pixels(left_top);
+            let left_bottom = pos2(left_top.x, child_ui.min_rect().bottom() - 2.0);
+            let left_bottom = self.painter().round_pos_to_pixels(left_bottom);
+
+            if left_vline {
+                // draw a faint line on the left to mark the indented section
+                self.painter.line_segment([left_top, left_bottom], stroke);
+            }
+
+            if end_with_horizontal_line {
+                let fudge = 2.0; // looks nicer with button rounding in collapsing headers
+                let right_bottom = pos2(child_ui.min_rect().right() - fudge, left_bottom.y);
+                self.painter
+                    .line_segment([left_bottom, right_bottom], stroke);
+            }
         }
 
         let response = self.allocate_rect(child_ui.min_rect(), Sense::hover());
@@ -2157,6 +2173,43 @@ impl Ui {
             menu::menu_button(self, title, add_contents)
         }
     }
+
+    /// Create a menu button with an image that when clicked will show the given menu.
+    ///
+    /// If called from within a menu this will instead create a button for a sub-menu.
+    ///
+    /// ```ignore
+    /// use egui_extras;
+    ///
+    /// let img = egui_extras::RetainedImage::from_svg_bytes_with_size(
+    ///     "rss",
+    ///     include_bytes!("rss.svg"),
+    ///     egui_extras::image::FitTo::Size(24, 24),
+    /// );
+    ///
+    /// ui.menu_image_button(img.texture_id(ctx), img.size_vec2(), |ui| {
+    ///     ui.menu_button("My sub-menu", |ui| {
+    ///         if ui.button("Close the menu").clicked() {
+    ///             ui.close_menu();
+    ///         }
+    ///     });
+    /// });
+    /// ```
+    ///
+    /// See also: [`Self::close_menu`] and [`Response::context_menu`].
+    #[inline]
+    pub fn menu_image_button<R>(
+        &mut self,
+        texture_id: TextureId,
+        image_size: impl Into<Vec2>,
+        add_contents: impl FnOnce(&mut Ui) -> R,
+    ) -> InnerResponse<Option<R>> {
+        if let Some(menu_state) = self.menu_state.clone() {
+            menu::submenu_button(self, menu_state, String::new(), add_contents)
+        } else {
+            menu::menu_image_button(self, texture_id, image_size, add_contents)
+        }
+    }
 }
 
 // ----------------------------------------------------------------------------

crates/egui/src/util/id_type_map.rs

@@ -460,18 +460,18 @@ impl IdTypeMap {
     }
 
     #[inline]
-    pub fn is_empty(&mut self) -> bool {
+    pub fn is_empty(&self) -> bool {
         self.0.is_empty()
     }
 
     #[inline]
-    pub fn len(&mut self) -> usize {
+    pub fn len(&self) -> usize {
         self.0.len()
     }
 
     /// Count how many values are stored but not yet deserialized.
     #[inline]
-    pub fn count_serialized(&mut self) -> usize {
+    pub fn count_serialized(&self) -> usize {
         self.0
             .values()
             .filter(|e| matches!(e, Element::Serialized { .. }))
@@ -479,7 +479,7 @@ impl IdTypeMap {
     }
 
     /// Count the number of values are stored with the given type.
-    pub fn count<T: 'static>(&mut self) -> usize {
+    pub fn count<T: 'static>(&self) -> usize {
         let key = TypeId::of::<T>();
         self.0
             .iter()

crates/egui/src/widget_text.rs

@@ -573,14 +573,14 @@ impl WidgetText {
                 let mut text_job = text.into_text_job(ui.style(), fallback_font.into(), valign);
                 text_job.job.wrap.max_width = wrap_width;
                 WidgetTextGalley {
-                    galley: ui.fonts().layout_job(text_job.job),
+                    galley: ui.fonts(|f| f.layout_job(text_job.job)),
                     galley_has_color: text_job.job_has_color,
                 }
             }
             Self::LayoutJob(mut job) => {
                 job.wrap.max_width = wrap_width;
                 WidgetTextGalley {
-                    galley: ui.fonts().layout_job(job),
+                    galley: ui.fonts(|f| f.layout_job(job)),
                     galley_has_color: true,
                 }
             }

crates/egui/src/widgets/button.rs

@@ -30,6 +30,7 @@ pub struct Button {
     small: bool,
     frame: Option<bool>,
     min_size: Vec2,
+    rounding: Option<Rounding>,
     image: Option<widgets::Image>,
 }
 
@@ -45,6 +46,7 @@ impl Button {
             small: false,
             frame: None,
             min_size: Vec2::ZERO,
+            rounding: None,
             image: None,
         }
     }
@@ -117,6 +119,12 @@ impl Button {
         self
     }
 
+    /// Set the rounding of the button.
+    pub fn rounding(mut self, rounding: impl Into<Rounding>) -> Self {
+        self.rounding = Some(rounding.into());
+        self
+    }
+
     /// Show some text on the right side of the button, in weak color.
     ///
     /// Designed for menu buttons, for setting a keyboard shortcut text (e.g. `Ctrl+S`).
@@ -140,6 +148,7 @@ impl Widget for Button {
             small,
             frame,
             min_size,
+            rounding,
             image,
         } = self;
 
@@ -171,10 +180,10 @@ impl Widget for Button {
             desired_size.x += ui.spacing().item_spacing.x + shortcut_text.size().x;
             desired_size.y = desired_size.y.max(shortcut_text.size().y);
         }
+        desired_size += 2.0 * button_padding;
         if !small {
             desired_size.y = desired_size.y.at_least(ui.spacing().interact_size.y);
         }
-        desired_size += 2.0 * button_padding;
         desired_size = desired_size.at_least(min_size);
 
         let (rect, response) = ui.allocate_at_least(desired_size, sense);
@@ -184,14 +193,11 @@ impl Widget for Button {
             let visuals = ui.style().interact(&response);
 
             if frame {
-                let fill = fill.unwrap_or(visuals.bg_fill);
+                let fill = fill.unwrap_or(visuals.weak_bg_fill);
                 let stroke = stroke.unwrap_or(visuals.bg_stroke);
-                ui.painter().rect(
-                    rect.expand(visuals.expansion),
-                    visuals.rounding,
-                    fill,
-                    stroke,
-                );
+                let rounding = rounding.unwrap_or(visuals.rounding);
+                ui.painter()
+                    .rect(rect.expand(visuals.expansion), rounding, fill, stroke);
             }
 
             let text_pos = if let Some(image) = image {
@@ -221,7 +227,10 @@ impl Widget for Button {
 
             if let Some(image) = image {
                 let image_rect = Rect::from_min_size(
-                    pos2(rect.min.x, rect.center().y - 0.5 - (image.size().y / 2.0)),
+                    pos2(
+                        rect.min.x + button_padding.x,
+                        rect.center().y - 0.5 - (image.size().y / 2.0),
+                    ),
                     image.size(),
                 );
                 image.paint_at(ui, image_rect);
@@ -260,6 +269,10 @@ impl<'a> Checkbox<'a> {
             text: text.into(),
         }
     }
+
+    pub fn without_text(checked: &'a mut bool) -> Self {
+        Self::new(checked, WidgetText::default())
+    }
 }
 
 impl<'a> Widget for Checkbox<'a> {
@@ -531,7 +544,7 @@ impl Widget for ImageButton {
                 (
                     expansion,
                     visuals.rounding,
-                    visuals.bg_fill,
+                    visuals.weak_bg_fill,
                     visuals.bg_stroke,
                 )
             } else {

crates/egui/src/widgets/color_picker.rs

@@ -228,9 +228,9 @@ fn color_text_ui(ui: &mut Ui, color: impl Into<Color32>, alpha: Alpha) {
 
         if ui.button("📋").on_hover_text("Click to copy").clicked() {
             if alpha == Alpha::Opaque {
-                ui.output().copied_text = format!("{}, {}, {}", r, g, b);
+                ui.output_mut(|o| o.copied_text = format!("{}, {}, {}", r, g, b));
             } else {
-                ui.output().copied_text = format!("{}, {}, {}, {}", r, g, b, a);
+                ui.output_mut(|o| o.copied_text = format!("{}, {}, {}, {}", r, g, b, a));
             }
         }
 
@@ -341,20 +341,20 @@ pub fn color_picker_color32(ui: &mut Ui, srgba: &mut Color32, alpha: Alpha) -> b
 
 pub fn color_edit_button_hsva(ui: &mut Ui, hsva: &mut Hsva, alpha: Alpha) -> Response {
     let popup_id = ui.auto_id_with("popup");
-    let open = ui.memory().is_popup_open(popup_id);
+    let open = ui.memory(|mem| mem.is_popup_open(popup_id));
     let mut button_response = color_button(ui, (*hsva).into(), open);
     if ui.style().explanation_tooltips {
         button_response = button_response.on_hover_text("Click to edit color");
     }
 
     if button_response.clicked() {
-        ui.memory().toggle_popup(popup_id);
+        ui.memory_mut(|mem| mem.toggle_popup(popup_id));
     }
 
     const COLOR_SLIDER_WIDTH: f32 = 210.0;
 
     // TODO(emilk): make it easier to show a temporary popup that closes when you click outside it
-    if ui.memory().is_popup_open(popup_id) {
+    if ui.memory(|mem| mem.is_popup_open(popup_id)) {
         let area_response = Area::new(popup_id)
             .order(Order::Foreground)
             .fixed_pos(button_response.rect.max)
@@ -370,9 +370,9 @@ pub fn color_edit_button_hsva(ui: &mut Ui, hsva: &mut Hsva, alpha: Alpha) -> Res
             .response;
 
         if !button_response.clicked()
-            && (ui.input().key_pressed(Key::Escape) || area_response.clicked_elsewhere())
+            && (ui.input(|i| i.key_pressed(Key::Escape)) || area_response.clicked_elsewhere())
         {
-            ui.memory().close_popup();
+            ui.memory_mut(|mem| mem.close_popup());
         }
     }
 
@@ -436,5 +436,5 @@ fn color_cache_set(ctx: &Context, rgba: impl Into<Rgba>, hsva: Hsva) {
 
 // To ensure we keep hue slider when `srgba` is gray we store the full [`Hsva`] in a cache:
 fn use_color_cache<R>(ctx: &Context, f: impl FnOnce(&mut FixedCache<Rgba, Hsva>) -> R) -> R {
-    f(ctx.data().get_temp_mut_or_default(Id::null()))
+    ctx.data_mut(|d| f(d.get_temp_mut_or_default(Id::null())))
 }

crates/egui/src/widgets/drag_value.rs

@@ -368,33 +368,35 @@ impl<'a> Widget for DragValue<'a> {
             custom_parser,
         } = self;
 
-        let shift = ui.input().modifiers.shift_only();
+        let shift = ui.input(|i| i.modifiers.shift_only());
         // The widget has the same ID whether it's in edit or button mode.
         let id = ui.next_auto_id();
-        let is_slow_speed = shift && ui.memory().is_being_dragged(id);
+        let is_slow_speed = shift && ui.memory(|mem| mem.is_being_dragged(id));
 
-        // The following call ensures that when a `DragValue` receives focus,
+        // The following ensures that when a `DragValue` receives focus,
         // it is immediately rendered in edit mode, rather than being rendered
         // in button mode for just one frame. This is important for
         // screen readers.
-        ui.memory().interested_in_focus(id);
-        let is_kb_editing = ui.memory().has_focus(id);
-        if ui.memory().gained_focus(id) {
-            ui.memory().drag_value.edit_string = None;
-        }
+        let is_kb_editing = ui.memory_mut(|mem| {
+            mem.interested_in_focus(id);
+            let is_kb_editing = mem.has_focus(id);
+            if mem.gained_focus(id) {
+                mem.drag_value.edit_string = None;
+            }
+            is_kb_editing
+        });
 
         let old_value = get(&mut get_set_value);
         let mut value = old_value;
-        let aim_rad = ui.input().aim_radius() as f64;
+        let aim_rad = ui.input(|i| i.aim_radius() as f64);
 
         let auto_decimals = (aim_rad / speed.abs()).log10().ceil().clamp(0.0, 15.0) as usize;
         let auto_decimals = auto_decimals + is_slow_speed as usize;
         let max_decimals = max_decimals.unwrap_or(auto_decimals + 2);
         let auto_decimals = auto_decimals.clamp(min_decimals, max_decimals);
 
-        let change = {
+        let change = ui.input_mut(|input| {
             let mut change = 0.0;
-            let mut input = ui.input_mut();
 
             if is_kb_editing {
                 // This deliberately doesn't listen for left and right arrow keys,
@@ -418,16 +420,18 @@ impl<'a> Widget for DragValue<'a> {
             }
 
             change
-        };
+        });
 
         #[cfg(feature = "accesskit")]
         {
             use accesskit::{Action, ActionData};
-            for request in ui.input().accesskit_action_requests(id, Action::SetValue) {
-                if let Some(ActionData::NumericValue(new_value)) = request.data {
-                    value = new_value;
+            ui.input(|input| {
+                for request in input.accesskit_action_requests(id, Action::SetValue) {
+                    if let Some(ActionData::NumericValue(new_value)) = request.data {
+                        value = new_value;
+                    }
                 }
-            }
+            });
         }
 
         if change != 0.0 {
@@ -438,7 +442,7 @@ impl<'a> Widget for DragValue<'a> {
         value = clamp_to_range(value, clamp_range.clone());
         if old_value != value {
             set(&mut get_set_value, value);
-            ui.memory().drag_value.edit_string = None;
+            ui.memory_mut(|mem| mem.drag_value.edit_string = None);
         }
 
         let value_text = match custom_formatter {
@@ -452,35 +456,43 @@ impl<'a> Widget for DragValue<'a> {
             }
         };
 
+        let text_style = ui.style().drag_value_text_style.clone();
+
         // some clones below are redundant if AccessKit is disabled
         #[allow(clippy::redundant_clone)]
         let mut response = if is_kb_editing {
-            let button_width = ui.spacing().interact_size.x;
             let mut value_text = ui
-                .memory()
-                .drag_value
-                .edit_string
-                .take()
+                .memory_mut(|mem| mem.drag_value.edit_string.take())
                 .unwrap_or_else(|| value_text.clone());
             let response = ui.add(
                 TextEdit::singleline(&mut value_text)
+                    .clip_text(false)
+                    .horizontal_align(ui.layout().horizontal_align())
+                    .vertical_align(ui.layout().vertical_align())
+                    .margin(ui.spacing().button_padding)
+                    .min_size(ui.spacing().interact_size)
                     .id(id)
-                    .desired_width(button_width)
-                    .font(TextStyle::Monospace),
+                    .desired_width(ui.spacing().interact_size.x)
+                    .font(text_style),
             );
-            let parsed_value = match custom_parser {
-                Some(parser) => parser(&value_text),
-                None => value_text.parse().ok(),
-            };
-            if let Some(parsed_value) = parsed_value {
-                let parsed_value = clamp_to_range(parsed_value, clamp_range.clone());
-                set(&mut get_set_value, parsed_value);
+            // Only update the value when the user presses enter, or clicks elsewhere. NOT every frame.
+            // See https://github.com/emilk/egui/issues/2687
+            if response.lost_focus() {
+                let parsed_value = match custom_parser {
+                    Some(parser) => parser(&value_text),
+                    None => value_text.parse().ok(),
+                };
+                if let Some(parsed_value) = parsed_value {
+                    let parsed_value = clamp_to_range(parsed_value, clamp_range.clone());
+                    set(&mut get_set_value, parsed_value);
+                }
             }
-            ui.memory().drag_value.edit_string = Some(value_text);
+            ui.memory_mut(|mem| mem.drag_value.edit_string = Some(value_text));
             response
         } else {
             let button = Button::new(
-                RichText::new(format!("{}{}{}", prefix, value_text.clone(), suffix)).monospace(),
+                RichText::new(format!("{}{}{}", prefix, value_text.clone(), suffix))
+                    .text_style(text_style),
             )
             .wrap(false)
             .sense(Sense::click_and_drag())
@@ -499,10 +511,18 @@ impl<'a> Widget for DragValue<'a> {
             }
 
             if response.clicked() {
-                ui.memory().drag_value.edit_string = None;
-                ui.memory().request_focus(id);
+                ui.memory_mut(|mem| {
+                    mem.drag_value.edit_string = None;
+                    mem.request_focus(id);
+                });
+                let mut state = TextEdit::load_state(ui.ctx(), id).unwrap_or_default();
+                state.set_ccursor_range(Some(text::CCursorRange::two(
+                    epaint::text::cursor::CCursor::default(),
+                    epaint::text::cursor::CCursor::new(value_text.chars().count()),
+                )));
+                state.store(ui.ctx(), response.id);
             } else if response.dragged() {
-                ui.output().cursor_icon = CursorIcon::ResizeHorizontal;
+                ui.ctx().set_cursor_icon(CursorIcon::ResizeHorizontal);
 
                 let mdelta = response.drag_delta();
                 let delta_points = mdelta.x - mdelta.y; // Increase to the right and up
@@ -512,7 +532,7 @@ impl<'a> Widget for DragValue<'a> {
                 let delta_value = delta_points as f64 * speed;
 
                 if delta_value != 0.0 {
-                    let mut drag_state = std::mem::take(&mut ui.memory().drag_value);
+                    let mut drag_state = ui.memory_mut(|mem| std::mem::take(&mut mem.drag_value));
 
                     // Since we round the value being dragged, we need to store the full precision value in memory:
                     let stored_value = (drag_state.last_dragged_id == Some(response.id))
@@ -533,7 +553,7 @@ impl<'a> Widget for DragValue<'a> {
 
                     drag_state.last_dragged_id = Some(response.id);
                     drag_state.last_dragged_value = Some(stored_value);
-                    ui.memory().drag_value = drag_state;
+                    ui.memory_mut(|mem| mem.drag_value = drag_state);
                 }
             }
 
@@ -545,28 +565,28 @@ impl<'a> Widget for DragValue<'a> {
         response.widget_info(|| WidgetInfo::drag_value(value));
 
         #[cfg(feature = "accesskit")]
-        if let Some(mut node) = ui.ctx().accesskit_node(response.id) {
+        ui.ctx().accesskit_node_builder(response.id, |builder| {
             use accesskit::Action;
             // If either end of the range is unbounded, it's better
             // to leave the corresponding AccessKit field set to None,
             // to allow for platform-specific default behavior.
             if clamp_range.start().is_finite() {
-                node.min_numeric_value = Some(*clamp_range.start());
+                builder.set_min_numeric_value(*clamp_range.start());
             }
             if clamp_range.end().is_finite() {
-                node.max_numeric_value = Some(*clamp_range.end());
+                builder.set_max_numeric_value(*clamp_range.end());
             }
-            node.numeric_value_step = Some(speed);
-            node.actions |= Action::SetValue;
+            builder.set_numeric_value_step(speed);
+            builder.add_action(Action::SetValue);
             if value < *clamp_range.end() {
-                node.actions |= Action::Increment;
+                builder.add_action(Action::Increment);
             }
             if value > *clamp_range.start() {
-                node.actions |= Action::Decrement;
+                builder.add_action(Action::Decrement);
             }
             // The name field is set to the current value by the button,
             // but we don't want it set that way on this widget type.
-            node.name = None;
+            builder.clear_name();
             // Always expose the value as a string. This makes the widget
             // more stable to accessibility users as it switches
             // between edit and button modes. This is particularly important
@@ -587,9 +607,9 @@ impl<'a> Widget for DragValue<'a> {
             // when in edit mode.
             if !is_kb_editing {
                 let value_text = format!("{}{}{}", prefix, value_text, suffix);
-                node.value = Some(value_text.into());
+                builder.set_value(value_text);
             }
-        }
+        });
 
         response
     }

crates/egui/src/widgets/hyperlink.rs

@@ -38,7 +38,7 @@ impl Widget for Link {
         response.widget_info(|| WidgetInfo::labeled(WidgetType::Link, text_galley.text()));
 
         if response.hovered() {
-            ui.ctx().output().cursor_icon = CursorIcon::PointingHand;
+            ui.ctx().set_cursor_icon(CursorIcon::PointingHand);
         }
 
         if ui.is_rect_visible(response.rect) {
@@ -110,16 +110,20 @@ impl Widget for Hyperlink {
 
         let response = ui.add(Link::new(text));
         if response.clicked() {
-            let modifiers = ui.ctx().input().modifiers;
-            ui.ctx().output().open_url = Some(crate::output::OpenUrl {
-                url: url.clone(),
-                new_tab: modifiers.any(),
+            let modifiers = ui.ctx().input(|i| i.modifiers);
+            ui.ctx().output_mut(|o| {
+                o.open_url = Some(crate::output::OpenUrl {
+                    url: url.clone(),
+                    new_tab: modifiers.any(),
+                });
             });
         }
         if response.middle_clicked() {
-            ui.ctx().output().open_url = Some(crate::output::OpenUrl {
-                url: url.clone(),
-                new_tab: true,
+            ui.ctx().output_mut(|o| {
+                o.open_url = Some(crate::output::OpenUrl {
+                    url: url.clone(),
+                    new_tab: true,
+                });
             });
         }
         response.on_hover_text(url)

crates/egui/src/widgets/label.rs

@@ -72,7 +72,7 @@ impl Label {
     pub fn layout_in_ui(self, ui: &mut Ui) -> (Pos2, WidgetTextGalley, Response) {
         let sense = self.sense.unwrap_or_else(|| {
             // We only want to focus labels if the screen reader is on.
-            if ui.memory().options.screen_reader {
+            if ui.memory(|mem| mem.options.screen_reader) {
                 Sense::focusable_noninteractive()
             } else {
                 Sense::hover()
@@ -120,7 +120,7 @@ impl Label {
             if let Some(first_section) = text_job.job.sections.first_mut() {
                 first_section.leading_space = first_row_indentation;
             }
-            let text_galley = text_job.into_galley(&ui.fonts());
+            let text_galley = ui.fonts(|f| text_job.into_galley(f));
 
             let pos = pos2(ui.max_rect().left(), ui.cursor().top());
             assert!(
@@ -153,7 +153,7 @@ impl Label {
                 text_job.job.justify = ui.layout().horizontal_justify();
             };
 
-            let text_galley = text_job.into_galley(&ui.fonts());
+            let text_galley = ui.fonts(|f| text_job.into_galley(f));
             let (rect, response) = ui.allocate_exact_size(text_galley.size(), sense);
             let pos = match text_galley.galley.job.halign {
                 Align::LEFT => rect.left_top(),
@@ -173,7 +173,7 @@ impl Widget for Label {
         if ui.is_rect_visible(response.rect) {
             let response_color = ui.style().interact(&response).text_color();
 
-            let underline = if response.has_focus() {
+            let underline = if response.has_focus() || response.highlighted() {
                 Stroke::new(1.0, response_color)
             } else {
                 Stroke::NONE

crates/egui/src/widgets/plot/items/mod.rs

@@ -1658,14 +1658,16 @@ fn add_rulers_and_text(
     let font_id = TextStyle::Body.resolve(plot.ui.style());
 
     let corner_value = elem.corner_value();
-    shapes.push(Shape::text(
-        &plot.ui.fonts(),
-        plot.transform.position_from_point(&corner_value) + vec2(3.0, -2.0),
-        Align2::LEFT_BOTTOM,
-        text,
-        font_id,
-        plot.ui.visuals().text_color(),
-    ));
+    plot.ui.fonts(|f| {
+        shapes.push(Shape::text(
+            f,
+            plot.transform.position_from_point(&corner_value) + vec2(3.0, -2.0),
+            Align2::LEFT_BOTTOM,
+            text,
+            font_id,
+            plot.ui.visuals().text_color(),
+        ));
+    });
 }
 
 /// Draws a cross of horizontal and vertical ruler at the `pointer` position.
@@ -1714,15 +1716,16 @@ pub(super) fn rulers_at_value(
     };
 
     let font_id = TextStyle::Body.resolve(plot.ui.style());
-
-    shapes.push(Shape::text(
-        &plot.ui.fonts(),
-        pointer + vec2(3.0, -2.0),
-        Align2::LEFT_BOTTOM,
-        text,
-        font_id,
-        plot.ui.visuals().text_color(),
-    ));
+    plot.ui.fonts(|f| {
+        shapes.push(Shape::text(
+            f,
+            pointer + vec2(3.0, -2.0),
+            Align2::LEFT_BOTTOM,
+            text,
+            font_id,
+            plot.ui.visuals().text_color(),
+        ));
+    });
 }
 
 fn find_closest_rect<'a, T>(

crates/egui/src/widgets/plot/legend.rs

@@ -89,9 +89,7 @@ impl LegendEntry {
 
         let font_id = text_style.resolve(ui.style());
 
-        let galley = ui
-            .fonts()
-            .layout_delayed_color(text, font_id, f32::INFINITY);
+        let galley = ui.fonts(|f| f.layout_delayed_color(text, font_id, f32::INFINITY));
 
         let icon_size = galley.size().y;
         let icon_spacing = icon_size / 5.0;

crates/egui/src/widgets/plot/mod.rs

@@ -108,11 +108,11 @@ struct PlotMemory {
 
 impl PlotMemory {
     pub fn load(ctx: &Context, id: Id) -> Option<Self> {
-        ctx.data().get_persisted(id)
+        ctx.data_mut(|d| d.get_persisted(id))
     }
 
     pub fn store(self, ctx: &Context, id: Id) {
-        ctx.data().insert_persisted(id, self);
+        ctx.data_mut(|d| d.insert_persisted(id, self));
     }
 }
 
@@ -742,7 +742,7 @@ impl Plot {
         });
 
         let PlotMemory {
-            mut bounds_modified,
+            bounds_modified,
             mut hovered_entry,
             mut hidden_items,
             last_screen_transform,
@@ -754,6 +754,7 @@ impl Plot {
             items: Vec::new(),
             next_auto_color_idx: 0,
             last_screen_transform,
+            bounds_modified,
             response,
             ctx: ui.ctx().clone(),
         };
@@ -762,6 +763,7 @@ impl Plot {
             mut items,
             mut response,
             last_screen_transform,
+            mut bounds_modified,
             ..
         } = plot_ui;
 
@@ -953,9 +955,9 @@ impl Plot {
         if let Some(hover_pos) = response.hover_pos() {
             if allow_zoom {
                 let zoom_factor = if data_aspect.is_some() {
-                    Vec2::splat(ui.input().zoom_delta())
+                    Vec2::splat(ui.input(|i| i.zoom_delta()))
                 } else {
-                    ui.input().zoom_delta_2d()
+                    ui.input(|i| i.zoom_delta_2d())
                 };
                 if zoom_factor != Vec2::splat(1.0) {
                     transform.zoom(zoom_factor, hover_pos);
@@ -963,7 +965,7 @@ impl Plot {
                 }
             }
             if allow_scroll {
-                let scroll_delta = ui.input().scroll_delta;
+                let scroll_delta = ui.input(|i| i.scroll_delta);
                 if scroll_delta != Vec2::ZERO {
                     transform.translate_bounds(-scroll_delta);
                     bounds_modified = true.into();
@@ -1042,6 +1044,7 @@ pub struct PlotUi {
     items: Vec<Box<dyn PlotItem>>,
     next_auto_color_idx: usize,
     last_screen_transform: ScreenTransform,
+    bounds_modified: AxisBools,
     response: Response,
     ctx: Context,
 }
@@ -1069,11 +1072,13 @@ impl PlotUi {
     /// Set the plot bounds. Can be useful for implementing alternative plot navigation methods.
     pub fn set_plot_bounds(&mut self, plot_bounds: PlotBounds) {
         self.last_screen_transform.set_bounds(plot_bounds);
+        self.bounds_modified = true.into();
     }
 
     /// Move the plot bounds. Can be useful for implementing alternative plot navigation methods.
     pub fn translate_bounds(&mut self, delta_pos: Vec2) {
         self.last_screen_transform.translate_bounds(delta_pos);
+        self.bounds_modified = true.into();
     }
 
     /// Returns `true` if the plot area is currently hovered.
@@ -1094,7 +1099,7 @@ impl PlotUi {
     /// The pointer position in plot coordinates. Independent of whether the pointer is in the plot area.
     pub fn pointer_coordinate(&self) -> Option<PlotPoint> {
         // We need to subtract the drag delta to keep in sync with the frame-delayed screen transform:
-        let last_pos = self.ctx().input().pointer.latest_pos()? - self.response.drag_delta();
+        let last_pos = self.ctx().input(|i| i.pointer.latest_pos())? - self.response.drag_delta();
         let value = self.plot_from_screen(last_pos);
         Some(value)
     }

crates/egui/src/widgets/progress_bar.rs

@@ -13,6 +13,7 @@ pub struct ProgressBar {
     progress: f32,
     desired_width: Option<f32>,
     text: Option<ProgressBarText>,
+    fill: Option<Color32>,
     animate: bool,
 }
 
@@ -23,6 +24,7 @@ impl ProgressBar {
             progress: progress.clamp(0.0, 1.0),
             desired_width: None,
             text: None,
+            fill: None,
             animate: false,
         }
     }
@@ -33,6 +35,12 @@ impl ProgressBar {
         self
     }
 
+    /// The fill color of the bar.
+    pub fn fill(mut self, color: Color32) -> Self {
+        self.fill = Some(color);
+        self
+    }
+
     /// A custom text to display on the progress bar.
     pub fn text(mut self, text: impl Into<WidgetText>) -> Self {
         self.text = Some(ProgressBarText::Custom(text.into()));
@@ -60,6 +68,7 @@ impl Widget for ProgressBar {
             progress,
             desired_width,
             text,
+            fill,
             animate,
         } = self;
 
@@ -90,7 +99,8 @@ impl Widget for ProgressBar {
 
             let (dark, bright) = (0.7, 1.0);
             let color_factor = if animate {
-                lerp(dark..=bright, ui.input().time.cos().abs())
+                let time = ui.input(|i| i.time);
+                lerp(dark..=bright, time.cos().abs())
             } else {
                 bright
             };
@@ -98,14 +108,17 @@ impl Widget for ProgressBar {
             ui.painter().rect(
                 inner_rect,
                 rounding,
-                Color32::from(Rgba::from(visuals.selection.bg_fill) * color_factor as f32),
+                Color32::from(
+                    Rgba::from(fill.unwrap_or(visuals.selection.bg_fill)) * color_factor as f32,
+                ),
                 Stroke::NONE,
             );
 
             if animate {
                 let n_points = 20;
-                let start_angle = ui.input().time * std::f64::consts::TAU;
-                let end_angle = start_angle + 240f64.to_radians() * ui.input().time.sin();
+                let time = ui.input(|i| i.time);
+                let start_angle = time * std::f64::consts::TAU;
+                let end_angle = start_angle + 240f64.to_radians() * time.sin();
                 let circle_radius = rounding - 2.0;
                 let points: Vec<Pos2> = (0..n_points)
                     .map(|i| {
@@ -116,10 +129,8 @@ impl Widget for ProgressBar {
                             + vec2(-rounding, 0.0)
                     })
                     .collect();
-                ui.painter().add(Shape::line(
-                    points,
-                    Stroke::new(2.0, visuals.faint_bg_color),
-                ));
+                ui.painter()
+                    .add(Shape::line(points, Stroke::new(2.0, visuals.text_color())));
             }
 
             if let Some(text_kind) = text {

crates/egui/src/widgets/selected_label.rs

@@ -61,11 +61,15 @@ impl Widget for SelectableLabel {
 
             let visuals = ui.style().interact_selectable(&response, selected);
 
-            if selected || response.hovered() || response.has_focus() {
+            if selected || response.hovered() || response.highlighted() || response.has_focus() {
                 let rect = rect.expand(visuals.expansion);
 
-                ui.painter()
-                    .rect(rect, visuals.rounding, visuals.bg_fill, visuals.bg_stroke);
+                ui.painter().rect(
+                    rect,
+                    visuals.rounding,
+                    visuals.weak_bg_fill,
+                    visuals.bg_stroke,
+                );
             }
 
             text.paint_with_visuals(ui.painter(), text_pos, &visuals);

crates/egui/src/widgets/separator.rs

@@ -14,6 +14,7 @@ use crate::*;
 #[must_use = "You should put this widget in an ui with `ui.add(widget);`"]
 pub struct Separator {
     spacing: f32,
+    grow: f32,
     is_horizontal_line: Option<bool>,
 }
 
@@ -21,6 +22,7 @@ impl Default for Separator {
     fn default() -> Self {
         Self {
             spacing: 6.0,
+            grow: 0.0,
             is_horizontal_line: None,
         }
     }
@@ -28,12 +30,19 @@ impl Default for Separator {
 
 impl Separator {
     /// How much space we take up. The line is painted in the middle of this.
+    ///
+    /// In a vertical layout, with a horizontal Separator,
+    /// this is the height of the separator widget.
+    ///
+    /// In a horizontal layout, with a vertical Separator,
+    /// this is the width of the separator widget.
     pub fn spacing(mut self, spacing: f32) -> Self {
         self.spacing = spacing;
         self
     }
 
     /// Explicitly ask for a horizontal line.
+    ///
     /// By default you will get a horizontal line in vertical layouts,
     /// and a vertical line in horizontal layouts.
     pub fn horizontal(mut self) -> Self {
@@ -42,18 +51,40 @@ impl Separator {
     }
 
     /// Explicitly ask for a vertical line.
+    ///
     /// By default you will get a horizontal line in vertical layouts,
     /// and a vertical line in horizontal layouts.
     pub fn vertical(mut self) -> Self {
         self.is_horizontal_line = Some(false);
         self
     }
+
+    /// Extend each end of the separator line by this much.
+    ///
+    /// The default is to take up the available width/height of the parent.
+    ///
+    /// This will make the line extend outside the parent ui.
+    pub fn grow(mut self, extra: f32) -> Self {
+        self.grow += extra;
+        self
+    }
+
+    /// Contract each end of the separator line by this much.
+    ///
+    /// The default is to take up the available width/height of the parent.
+    ///
+    /// This effectively adds margins to the line.
+    pub fn shrink(mut self, shrink: f32) -> Self {
+        self.grow -= shrink;
+        self
+    }
 }
 
 impl Widget for Separator {
     fn ui(self, ui: &mut Ui) -> Response {
         let Separator {
             spacing,
+            grow,
             is_horizontal_line,
         } = self;
 
@@ -75,14 +106,14 @@ impl Widget for Separator {
             let painter = ui.painter();
             if is_horizontal_line {
                 painter.hline(
-                    rect.x_range(),
+                    (rect.left() - grow)..=(rect.right() + grow),
                     painter.round_to_pixel(rect.center().y),
                     stroke,
                 );
             } else {
                 painter.vline(
                     painter.round_to_pixel(rect.center().x),
-                    rect.y_range(),
+                    (rect.top() - grow)..=(rect.bottom() + grow),
                     stroke,
                 );
             }

crates/egui/src/widgets/slider.rs

@@ -84,6 +84,7 @@ pub struct Slider<'a> {
     max_decimals: Option<usize>,
     custom_formatter: Option<NumFormatter<'a>>,
     custom_parser: Option<NumParser<'a>>,
+    trailing_fill: Option<bool>,
 }
 
 impl<'a> Slider<'a> {
@@ -129,6 +130,7 @@ impl<'a> Slider<'a> {
             max_decimals: None,
             custom_formatter: None,
             custom_parser: None,
+            trailing_fill: None,
         }
     }
 
@@ -269,6 +271,17 @@ impl<'a> Slider<'a> {
         self
     }
 
+    /// Display trailing color behind the slider's circle. Default is OFF.
+    ///
+    /// This setting can be enabled globally for all sliders with [`Visuals::slider_trailing_fill`].
+    /// Toggling it here will override the above setting ONLY for this individual slider.
+    ///
+    /// The fill color will be taken from `selection.bg_fill` in your [`Visuals`], the same as a [`ProgressBar`].
+    pub fn trailing_fill(mut self, trailing_fill: bool) -> Self {
+        self.trailing_fill = Some(trailing_fill);
+        self
+    }
+
     /// Set custom formatter defining how numbers are converted into text.
     ///
     /// A custom formatter takes a `f64` for the numeric value and a `RangeInclusive<usize>` representing
@@ -540,7 +553,7 @@ impl<'a> Slider<'a> {
         if let Some(pointer_position_2d) = response.interact_pointer_pos() {
             let position = self.pointer_position(pointer_position_2d);
             let new_value = if self.smart_aim {
-                let aim_radius = ui.input().aim_radius();
+                let aim_radius = ui.input(|i| i.aim_radius());
                 emath::smart_aim::best_in_range_f64(
                     self.value_from_position(position - aim_radius, position_range.clone()),
                     self.value_from_position(position + aim_radius, position_range.clone()),
@@ -562,19 +575,19 @@ impl<'a> Slider<'a> {
                 SliderOrientation::Vertical => (Key::ArrowUp, Key::ArrowDown),
             };
 
-            decrement += ui.input().num_presses(dec_key);
-            increment += ui.input().num_presses(inc_key);
+            ui.input(|input| {
+                decrement += input.num_presses(dec_key);
+                increment += input.num_presses(inc_key);
+            });
         }
 
         #[cfg(feature = "accesskit")]
         {
             use accesskit::Action;
-            decrement += ui
-                .input()
-                .num_accesskit_action_requests(response.id, Action::Decrement);
-            increment += ui
-                .input()
-                .num_accesskit_action_requests(response.id, Action::Increment);
+            ui.input(|input| {
+                decrement += input.num_accesskit_action_requests(response.id, Action::Decrement);
+                increment += input.num_accesskit_action_requests(response.id, Action::Increment);
+            });
         }
 
         let kb_step = increment as f32 - decrement as f32;
@@ -586,7 +599,7 @@ impl<'a> Slider<'a> {
             let new_value = match self.step {
                 Some(step) => prev_value + (kb_step as f64 * step),
                 None if self.smart_aim => {
-                    let aim_radius = ui.input().aim_radius();
+                    let aim_radius = ui.input(|i| i.aim_radius());
                     emath::smart_aim::best_in_range_f64(
                         self.value_from_position(new_position - aim_radius, position_range.clone()),
                         self.value_from_position(new_position + aim_radius, position_range.clone()),
@@ -600,14 +613,13 @@ impl<'a> Slider<'a> {
         #[cfg(feature = "accesskit")]
         {
             use accesskit::{Action, ActionData};
-            for request in ui
-                .input()
-                .accesskit_action_requests(response.id, Action::SetValue)
-            {
-                if let Some(ActionData::NumericValue(new_value)) = request.data {
-                    self.set_value(new_value);
+            ui.input(|input| {
+                for request in input.accesskit_action_requests(response.id, Action::SetValue) {
+                    if let Some(ActionData::NumericValue(new_value)) = request.data {
+                        self.set_value(new_value);
+                    }
                 }
-            }
+            });
         }
 
         // Paint it:
@@ -617,22 +629,40 @@ impl<'a> Slider<'a> {
             let rail_radius = ui.painter().round_to_pixel(self.rail_radius_limit(rect));
             let rail_rect = self.rail_rect(rect, rail_radius);
 
-            let position_1d = self.position_from_value(value, position_range);
-
             let visuals = ui.style().interact(response);
-            ui.painter().add(epaint::RectShape {
-                rect: rail_rect,
-                rounding: ui.visuals().widgets.inactive.rounding,
-                fill: ui.visuals().widgets.inactive.bg_fill,
-                // fill: visuals.bg_fill,
-                // fill: ui.visuals().extreme_bg_color,
-                stroke: Default::default(),
-                // stroke: visuals.bg_stroke,
-                // stroke: ui.visuals().widgets.inactive.bg_stroke,
-            });
+            let widget_visuals = &ui.visuals().widgets;
 
+            ui.painter().rect_filled(
+                rail_rect,
+                widget_visuals.inactive.rounding,
+                widget_visuals.inactive.bg_fill,
+            );
+
+            let position_1d = self.position_from_value(value, position_range);
             let center = self.marker_center(position_1d, &rail_rect);
 
+            // Decide if we should add trailing fill.
+            let trailing_fill = self
+                .trailing_fill
+                .unwrap_or_else(|| ui.visuals().slider_trailing_fill);
+
+            // Paint trailing fill.
+            if trailing_fill {
+                let mut trailing_rail_rect = rail_rect;
+
+                // The trailing rect has to be drawn differently depending on the orientation.
+                match self.orientation {
+                    SliderOrientation::Vertical => trailing_rail_rect.min.y = center.y,
+                    SliderOrientation::Horizontal => trailing_rail_rect.max.x = center.x,
+                };
+
+                ui.painter().rect_filled(
+                    trailing_rail_rect,
+                    widget_visuals.inactive.rounding,
+                    ui.visuals().selection.bg_fill,
+                );
+            }
+
             ui.painter().add(epaint::CircleShape {
                 center,
                 radius: self.handle_radius(rect) + visuals.expansion,
@@ -697,14 +727,12 @@ impl<'a> Slider<'a> {
     }
 
     fn value_ui(&mut self, ui: &mut Ui, position_range: RangeInclusive<f32>) -> Response {
-        let change = {
-            // Hold one lock rather than 4 (see https://github.com/emilk/egui/pull/1380).
-            let input = ui.input();
-
+        // If [`DragValue`] is controlled from the keyboard and `step` is defined, set speed to `step`
+        let change = ui.input(|input| {
             input.num_presses(Key::ArrowUp) as i32 + input.num_presses(Key::ArrowRight) as i32
                 - input.num_presses(Key::ArrowDown) as i32
                 - input.num_presses(Key::ArrowLeft) as i32
-        };
+        });
 
         let any_change = change != 0;
         let speed = if let (Some(step), true) = (self.step, any_change) {
@@ -764,20 +792,22 @@ impl<'a> Slider<'a> {
         response.widget_info(|| WidgetInfo::slider(value, self.text.text()));
 
         #[cfg(feature = "accesskit")]
-        if let Some(mut node) = ui.ctx().accesskit_node(response.id) {
+        ui.ctx().accesskit_node_builder(response.id, |builder| {
             use accesskit::Action;
-            node.min_numeric_value = Some(*self.range.start());
-            node.max_numeric_value = Some(*self.range.end());
-            node.numeric_value_step = self.step;
-            node.actions |= Action::SetValue;
+            builder.set_min_numeric_value(*self.range.start());
+            builder.set_max_numeric_value(*self.range.end());
+            if let Some(step) = self.step {
+                builder.set_numeric_value_step(step);
+            }
+            builder.add_action(Action::SetValue);
             let clamp_range = self.clamp_range();
             if value < *clamp_range.end() {
-                node.actions |= Action::Increment;
+                builder.add_action(Action::Increment);
             }
             if value > *clamp_range.start() {
-                node.actions |= Action::Decrement;
+                builder.add_action(Action::Decrement);
             }
-        }
+        });
 
         let slider_response = response.clone();
 

crates/egui/src/widgets/spinner.rs

@@ -48,8 +48,9 @@ impl Widget for Spinner {
 
             let radius = (rect.height() / 2.0) - 2.0;
             let n_points = 20;
-            let start_angle = ui.input().time * std::f64::consts::TAU;
-            let end_angle = start_angle + 240f64.to_radians() * ui.input().time.sin();
+            let time = ui.input(|i| i.time);
+            let start_angle = time * std::f64::consts::TAU;
+            let end_angle = start_angle + 240f64.to_radians() * time.sin();
             let points: Vec<Pos2> = (0..n_points)
                 .map(|i| {
                     let angle = lerp(start_angle..=end_angle, i as f64 / n_points as f64);

crates/egui/src/widgets/text_edit/builder.rs

@@ -19,7 +19,7 @@ use super::{CCursorRange, CursorRange, TextEditOutput, TextEditState};
 /// if response.changed() {
 ///     // …
 /// }
-/// if response.lost_focus() && ui.input().key_pressed(egui::Key::Enter) {
+/// if response.lost_focus() && ui.input(|i| i.key_pressed(egui::Key::Enter)) {
 ///     // …
 /// }
 /// # });
@@ -67,6 +67,9 @@ pub struct TextEdit<'t> {
     desired_height_rows: usize,
     lock_focus: bool,
     cursor_at_end: bool,
+    min_size: Vec2,
+    align: Align2,
+    clip_text: bool,
 }
 
 impl<'t> WidgetWithState for TextEdit<'t> {
@@ -89,6 +92,7 @@ impl<'t> TextEdit<'t> {
         Self {
             desired_height_rows: 1,
             multiline: false,
+            clip_text: true,
             ..Self::multiline(text)
         }
     }
@@ -112,6 +116,9 @@ impl<'t> TextEdit<'t> {
             desired_height_rows: 4,
             lock_focus: false,
             cursor_at_end: true,
+            min_size: Vec2::ZERO,
+            align: Align2::LEFT_TOP,
+            clip_text: false,
         }
     }
 
@@ -206,7 +213,7 @@ impl<'t> TextEdit<'t> {
     /// let mut layouter = |ui: &egui::Ui, string: &str, wrap_width: f32| {
     ///     let mut layout_job: egui::text::LayoutJob = my_memoized_highlighter(string);
     ///     layout_job.wrap.max_width = wrap_width;
-    ///     ui.fonts().layout_job(layout_job)
+    ///     ui.fonts(|f| f.layout_job(layout_job))
     /// };
     /// ui.add(egui::TextEdit::multiline(&mut my_code).layouter(&mut layouter));
     /// # });
@@ -269,6 +276,37 @@ impl<'t> TextEdit<'t> {
         self.cursor_at_end = b;
         self
     }
+
+    /// When `true` (default), overflowing text will be clipped.
+    ///
+    /// When `false`, widget width will expand to make all text visible.
+    ///
+    /// This only works for singleline [`TextEdit`].
+    pub fn clip_text(mut self, b: bool) -> Self {
+        // always show everything in multiline
+        if !self.multiline {
+            self.clip_text = b;
+        }
+        self
+    }
+
+    /// Set the horizontal align of the inner text.
+    pub fn horizontal_align(mut self, align: Align) -> Self {
+        self.align.0[0] = align;
+        self
+    }
+
+    /// Set the vertical align of the inner text.
+    pub fn vertical_align(mut self, align: Align) -> Self {
+        self.align.0[1] = align;
+        self
+    }
+
+    /// Set the minimum size of the [`TextEdit`].
+    pub fn min_size(mut self, min_size: Vec2) -> Self {
+        self.min_size = min_size;
+        self
+    }
 }
 
 // ----------------------------------------------------------------------------
@@ -312,7 +350,7 @@ impl<'t> TextEdit<'t> {
             output.response |= ui.interact(frame_rect, id, Sense::click());
         }
         if output.response.clicked() && !output.response.lost_focus() {
-            ui.memory().request_focus(output.response.id);
+            ui.memory_mut(|mem| mem.request_focus(output.response.id));
         }
 
         if frame {
@@ -364,13 +402,16 @@ impl<'t> TextEdit<'t> {
             layouter,
             password,
             frame: _,
-            margin: _,
+            margin,
             multiline,
             interactive,
             desired_width,
             desired_height_rows,
             lock_focus,
             cursor_at_end,
+            min_size,
+            align,
+            clip_text,
         } = self;
 
         let text_color = text_color
@@ -381,7 +422,7 @@ impl<'t> TextEdit<'t> {
         let prev_text = text.as_str().to_owned();
 
         let font_id = font_selection.resolve(ui.style());
-        let row_height = ui.fonts().row_height(&font_id);
+        let row_height = ui.fonts(|f| f.row_height(&font_id));
         const MIN_WIDTH: f32 = 24.0; // Never make a [`TextEdit`] more narrow than this.
         let available_width = ui.available_width().at_least(MIN_WIDTH);
         let desired_width = desired_width.unwrap_or_else(|| ui.spacing().text_edit_width);
@@ -389,29 +430,31 @@ impl<'t> TextEdit<'t> {
             available_width
         } else {
             desired_width.min(available_width)
-        };
+        } - margin.x * 2.0;
 
         let font_id_clone = font_id.clone();
         let mut default_layouter = move |ui: &Ui, text: &str, wrap_width: f32| {
             let text = mask_if_password(password, text);
-            ui.fonts().layout_job(if multiline {
+            let layout_job = if multiline {
                 LayoutJob::simple(text, font_id_clone.clone(), text_color, wrap_width)
             } else {
                 LayoutJob::simple_singleline(text, font_id_clone.clone(), text_color)
-            })
+            };
+            ui.fonts(|f| f.layout_job(layout_job))
         };
 
         let layouter = layouter.unwrap_or(&mut default_layouter);
 
         let mut galley = layouter(ui, text.as_str(), wrap_width);
 
-        let desired_width = if multiline {
-            galley.size().x.max(wrap_width) // always show everything in multiline
+        let desired_width = if clip_text {
+            wrap_width // visual clipping with scroll in singleline input.
         } else {
-            wrap_width // visual clipping with scroll in singleline input. TODO(emilk): opt-in/out?
+            galley.size().x.max(wrap_width)
         };
         let desired_height = (desired_height_rows.at_least(1) as f32) * row_height;
-        let desired_size = vec2(desired_width, galley.size().y.max(desired_height));
+        let desired_size = vec2(desired_width, galley.size().y.max(desired_height))
+            .at_least(min_size - margin * 2.0);
 
         let (auto_id, rect) = ui.allocate_space(desired_size);
 
@@ -428,8 +471,8 @@ impl<'t> TextEdit<'t> {
         // dragging select text, or scroll the enclosing [`ScrollArea`] (if any)?
         // Since currently copying selected text in not supported on `eframe` web,
         // we prioritize touch-scrolling:
-        let any_touches = ui.input().any_touches(); // separate line to avoid double-locking the same mutex
-        let allow_drag_to_select = !any_touches || ui.memory().has_focus(id);
+        let allow_drag_to_select =
+            ui.input(|i| !i.any_touches()) || ui.memory(|mem| mem.has_focus(id));
 
         let sense = if interactive {
             if allow_drag_to_select {
@@ -447,7 +490,7 @@ impl<'t> TextEdit<'t> {
         if interactive {
             if let Some(pointer_pos) = ui.ctx().pointer_interact_pos() {
                 if response.hovered() && text.is_mutable() {
-                    ui.output().mutable_text_under_cursor = true;
+                    ui.output_mut(|o| o.mutable_text_under_cursor = true);
                 }
 
                 // TODO(emilk): drag selected text to either move or clone (ctrl on windows, alt on mac)
@@ -457,7 +500,7 @@ impl<'t> TextEdit<'t> {
 
                 if ui.visuals().text_cursor_preview
                     && response.hovered()
-                    && ui.input().pointer.is_moving()
+                    && ui.input(|i| i.pointer.is_moving())
                 {
                     // preview:
                     paint_cursor_end(
@@ -487,9 +530,9 @@ impl<'t> TextEdit<'t> {
                         secondary: galley.from_ccursor(ccursor_range.secondary),
                     }));
                 } else if allow_drag_to_select {
-                    if response.hovered() && ui.input().pointer.any_pressed() {
-                        ui.memory().request_focus(id);
-                        if ui.input().modifiers.shift {
+                    if response.hovered() && ui.input(|i| i.pointer.any_pressed()) {
+                        ui.memory_mut(|mem| mem.request_focus(id));
+                        if ui.input(|i| i.modifiers.shift) {
                             if let Some(mut cursor_range) = state.cursor_range(&galley) {
                                 cursor_range.primary = cursor_at_pointer;
                                 state.set_cursor_range(Some(cursor_range));
@@ -499,7 +542,8 @@ impl<'t> TextEdit<'t> {
                         } else {
                             state.set_cursor_range(Some(CursorRange::one(cursor_at_pointer)));
                         }
-                    } else if ui.input().pointer.any_down() && response.is_pointer_button_down_on()
+                    } else if ui.input(|i| i.pointer.any_down())
+                        && response.is_pointer_button_down_on()
                     {
                         // drag to select text:
                         if let Some(mut cursor_range) = state.cursor_range(&galley) {
@@ -511,14 +555,14 @@ impl<'t> TextEdit<'t> {
             }
         }
 
-        if response.hovered() && interactive {
-            ui.output().cursor_icon = CursorIcon::Text;
+        if interactive && response.hovered() {
+            ui.ctx().set_cursor_icon(CursorIcon::Text);
         }
 
         let mut cursor_range = None;
         let prev_cursor_range = state.cursor_range(&galley);
-        if ui.memory().has_focus(id) && interactive {
-            ui.memory().lock_focus(id, lock_focus);
+        if interactive && ui.memory(|mem| mem.has_focus(id)) {
+            ui.memory_mut(|mem| mem.lock_focus(id, lock_focus));
 
             let default_cursor_range = if cursor_at_end {
                 CursorRange::one(galley.end())
@@ -545,11 +589,15 @@ impl<'t> TextEdit<'t> {
             cursor_range = Some(new_cursor_range);
         }
 
-        let mut text_draw_pos = response.rect.min;
+        let mut text_draw_pos = align
+            .align_size_within_rect(galley.size(), response.rect)
+            .intersect(response.rect) // limit pos to the response rect area
+            .min;
+        let align_offset = response.rect.left() - text_draw_pos.x;
 
         // Visual clipping for singleline text editor with text larger than width
-        if !multiline {
-            let cursor_pos = match (cursor_range, ui.memory().has_focus(id)) {
+        if clip_text && align_offset == 0.0 {
+            let cursor_pos = match (cursor_range, ui.memory(|mem| mem.has_focus(id))) {
                 (Some(cursor_range), true) => galley.pos_from_cursor(&cursor_range.primary).min.x,
                 _ => 0.0,
             };
@@ -571,6 +619,8 @@ impl<'t> TextEdit<'t> {
 
             state.singleline_offset = offset_x;
             text_draw_pos -= vec2(offset_x, 0.0);
+        } else {
+            state.singleline_offset = align_offset;
         }
 
         let selection_changed = if let (Some(cursor_range), Some(prev_cursor_range)) =
@@ -594,7 +644,7 @@ impl<'t> TextEdit<'t> {
                 galley.paint_with_fallback_color(&painter, response.rect.min, hint_text_color);
             }
 
-            if ui.memory().has_focus(id) {
+            if ui.memory(|mem| mem.has_focus(id)) {
                 if let Some(cursor_range) = state.cursor_range(&galley) {
                     // We paint the cursor on top of the text, in case
                     // the text galley has backgrounds (as e.g. `code` snippets in markup do).
@@ -621,9 +671,13 @@ impl<'t> TextEdit<'t> {
                             // But `winit` and `egui_web` differs in how to set the
                             // position of IME.
                             if cfg!(target_arch = "wasm32") {
-                                ui.ctx().output().text_cursor_pos = Some(cursor_pos.left_top());
+                                ui.ctx().output_mut(|o| {
+                                    o.text_cursor_pos = Some(cursor_pos.left_top());
+                                });
                             } else {
-                                ui.ctx().output().text_cursor_pos = Some(cursor_pos.left_bottom());
+                                ui.ctx().output_mut(|o| {
+                                    o.text_cursor_pos = Some(cursor_pos.left_bottom());
+                                });
                             }
                         }
                     }
@@ -659,89 +713,100 @@ impl<'t> TextEdit<'t> {
         }
 
         #[cfg(feature = "accesskit")]
-        if let Some(mut node) = ui.ctx().accesskit_node(response.id) {
-            use accesskit::{Role, TextDirection, TextPosition, TextSelection};
+        {
+            let parent_id = ui.ctx().accesskit_node_builder(response.id, |builder| {
+                use accesskit::{TextPosition, TextSelection};
 
-            let parent_id = response.id;
+                let parent_id = response.id;
 
-            if let Some(cursor_range) = &cursor_range {
-                let anchor = &cursor_range.secondary.rcursor;
-                let focus = &cursor_range.primary.rcursor;
-                node.text_selection = Some(TextSelection {
-                    anchor: TextPosition {
-                        node: parent_id.with(anchor.row).accesskit_id(),
-                        character_index: anchor.column,
-                    },
-                    focus: TextPosition {
-                        node: parent_id.with(focus.row).accesskit_id(),
-                        character_index: focus.column,
-                    },
+                if let Some(cursor_range) = &cursor_range {
+                    let anchor = &cursor_range.secondary.rcursor;
+                    let focus = &cursor_range.primary.rcursor;
+                    builder.set_text_selection(TextSelection {
+                        anchor: TextPosition {
+                            node: parent_id.with(anchor.row).accesskit_id(),
+                            character_index: anchor.column,
+                        },
+                        focus: TextPosition {
+                            node: parent_id.with(focus.row).accesskit_id(),
+                            character_index: focus.column,
+                        },
+                    });
+                }
+
+                builder.set_default_action_verb(accesskit::DefaultActionVerb::Focus);
+                if self.multiline {
+                    builder.set_multiline();
+                }
+
+                parent_id
+            });
+
+            if let Some(parent_id) = parent_id {
+                // drop ctx lock before further processing
+                use accesskit::{Role, TextDirection};
+
+                ui.ctx().with_accessibility_parent(parent_id, || {
+                    for (i, row) in galley.rows.iter().enumerate() {
+                        let id = parent_id.with(i);
+                        ui.ctx().accesskit_node_builder(id, |builder| {
+                            builder.set_role(Role::InlineTextBox);
+                            let rect = row.rect.translate(text_draw_pos.to_vec2());
+                            builder.set_bounds(accesskit::Rect {
+                                x0: rect.min.x.into(),
+                                y0: rect.min.y.into(),
+                                x1: rect.max.x.into(),
+                                y1: rect.max.y.into(),
+                            });
+                            builder.set_text_direction(TextDirection::LeftToRight);
+                            // TODO(mwcampbell): Set more node fields for the row
+                            // once AccessKit adapters expose text formatting info.
+
+                            let glyph_count = row.glyphs.len();
+                            let mut value = String::new();
+                            value.reserve(glyph_count);
+                            let mut character_lengths = Vec::<u8>::new();
+                            character_lengths.reserve(glyph_count);
+                            let mut character_positions = Vec::<f32>::new();
+                            character_positions.reserve(glyph_count);
+                            let mut character_widths = Vec::<f32>::new();
+                            character_widths.reserve(glyph_count);
+                            let mut word_lengths = Vec::<u8>::new();
+                            let mut was_at_word_end = false;
+                            let mut last_word_start = 0usize;
+
+                            for glyph in &row.glyphs {
+                                let is_word_char = is_word_char(glyph.chr);
+                                if is_word_char && was_at_word_end {
+                                    word_lengths
+                                        .push((character_lengths.len() - last_word_start) as _);
+                                    last_word_start = character_lengths.len();
+                                }
+                                was_at_word_end = !is_word_char;
+                                let old_len = value.len();
+                                value.push(glyph.chr);
+                                character_lengths.push((value.len() - old_len) as _);
+                                character_positions.push(glyph.pos.x - row.rect.min.x);
+                                character_widths.push(glyph.size.x);
+                            }
+
+                            if row.ends_with_newline {
+                                value.push('\n');
+                                character_lengths.push(1);
+                                character_positions.push(row.rect.max.x - row.rect.min.x);
+                                character_widths.push(0.0);
+                            }
+                            word_lengths.push((character_lengths.len() - last_word_start) as _);
+
+                            builder.set_value(value);
+                            builder.set_character_lengths(character_lengths);
+                            builder.set_character_positions(character_positions);
+                            builder.set_character_widths(character_widths);
+                            builder.set_word_lengths(word_lengths);
+                        });
+                    }
                 });
             }
-
-            node.default_action_verb = Some(accesskit::DefaultActionVerb::Focus);
-            node.multiline = self.multiline;
-
-            drop(node);
-
-            ui.ctx().with_accessibility_parent(parent_id, || {
-                for (i, row) in galley.rows.iter().enumerate() {
-                    let id = parent_id.with(i);
-                    let mut node = ui.ctx().accesskit_node(id).unwrap();
-                    node.role = Role::InlineTextBox;
-                    let rect = row.rect.translate(text_draw_pos.to_vec2());
-                    node.bounds = Some(accesskit::kurbo::Rect {
-                        x0: rect.min.x.into(),
-                        y0: rect.min.y.into(),
-                        x1: rect.max.x.into(),
-                        y1: rect.max.y.into(),
-                    });
-                    node.text_direction = Some(TextDirection::LeftToRight);
-                    // TODO(mwcampbell): Set more node fields for the row
-                    // once AccessKit adapters expose text formatting info.
-
-                    let glyph_count = row.glyphs.len();
-                    let mut value = String::new();
-                    value.reserve(glyph_count);
-                    let mut character_lengths = Vec::<u8>::new();
-                    character_lengths.reserve(glyph_count);
-                    let mut character_positions = Vec::<f32>::new();
-                    character_positions.reserve(glyph_count);
-                    let mut character_widths = Vec::<f32>::new();
-                    character_widths.reserve(glyph_count);
-                    let mut word_lengths = Vec::<u8>::new();
-                    let mut was_at_word_end = false;
-                    let mut last_word_start = 0usize;
-
-                    for glyph in &row.glyphs {
-                        let is_word_char = is_word_char(glyph.chr);
-                        if is_word_char && was_at_word_end {
-                            word_lengths.push((character_lengths.len() - last_word_start) as _);
-                            last_word_start = character_lengths.len();
-                        }
-                        was_at_word_end = !is_word_char;
-                        let old_len = value.len();
-                        value.push(glyph.chr);
-                        character_lengths.push((value.len() - old_len) as _);
-                        character_positions.push(glyph.pos.x - row.rect.min.x);
-                        character_widths.push(glyph.size.x);
-                    }
-
-                    if row.ends_with_newline {
-                        value.push('\n');
-                        character_lengths.push(1);
-                        character_positions.push(row.rect.max.x - row.rect.min.x);
-                        character_widths.push(0.0);
-                    }
-                    word_lengths.push((character_lengths.len() - last_word_start) as _);
-
-                    node.value = Some(value.into());
-                    node.character_lengths = character_lengths.into();
-                    node.character_positions = Some(character_positions.into());
-                    node.character_widths = Some(character_widths.into());
-                    node.word_lengths = word_lengths.into();
-                }
-            });
         }
 
         TextEditOutput {
@@ -812,19 +877,19 @@ fn events(
     // We feed state to the undoer both before and after handling input
     // so that the undoer creates automatic saves even when there are no events for a while.
     state.undoer.lock().feed_state(
-        ui.input().time,
+        ui.input(|i| i.time),
         &(cursor_range.as_ccursor_range(), text.as_str().to_owned()),
     );
 
     let copy_if_not_password = |ui: &Ui, text: String| {
         if !password {
-            ui.ctx().output().copied_text = text;
+            ui.ctx().output_mut(|o| o.copied_text = text);
         }
     };
 
     let mut any_change = false;
 
-    let events = ui.input().events.clone(); // avoid dead-lock by cloning. TODO(emilk): optimize
+    let events = ui.input(|i| i.events.clone()); // avoid dead-lock by cloning. TODO(emilk): optimize
     for event in &events {
         let did_mutate_text = match event {
             Event::Copy => {
@@ -869,7 +934,7 @@ fn events(
                 modifiers,
                 ..
             } => {
-                if multiline && ui.memory().has_lock_focus(id) {
+                if multiline && ui.memory(|mem| mem.has_lock_focus(id)) {
                     let mut ccursor = delete_selected(text, &cursor_range);
                     if modifiers.shift {
                         // TODO(emilk): support removing indentation over a selection?
@@ -893,7 +958,7 @@ fn events(
                     // TODO(emilk): if code editor, auto-indent by same leading tabs, + one if the lines end on an opening bracket
                     Some(CCursorRange::one(ccursor))
                 } else {
-                    ui.memory().surrender_focus(id); // End input with enter
+                    ui.memory_mut(|mem| mem.surrender_focus(id)); // End input with enter
                     break;
                 }
             }
@@ -997,7 +1062,7 @@ fn events(
     state.set_cursor_range(Some(cursor_range));
 
     state.undoer.lock().feed_state(
-        ui.input().time,
+        ui.input(|i| i.time),
         &(cursor_range.as_ccursor_range(), text.as_str().to_owned()),
     );
 

crates/egui/src/widgets/text_edit/state.rs

@@ -34,11 +34,11 @@ pub struct TextEditState {
 
 impl TextEditState {
     pub fn load(ctx: &Context, id: Id) -> Option<Self> {
-        ctx.data().get_persisted(id)
+        ctx.data_mut(|d| d.get_persisted(id))
     }
 
     pub fn store(self, ctx: &Context, id: Id) {
-        ctx.data().insert_persisted(id, self);
+        ctx.data_mut(|d| d.insert_persisted(id, self));
     }
 
     /// The the currently selected range of characters.

crates/egui_demo_app/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "egui_demo_app"
-version = "0.20.0"
+version = "0.21.0"
 authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
 license = "MIT OR Apache-2.0"
 edition = "2021"
@@ -20,7 +20,7 @@ default = ["glow", "persistence"]
 
 http = ["ehttp", "image", "poll-promise", "egui_extras/image"]
 persistence = ["eframe/persistence", "egui/persistence", "serde"]
-screen_reader = ["eframe/screen_reader"]                          # experimental
+web_screen_reader = ["eframe/web_screen_reader"]                  # experimental
 serde = ["dep:serde", "egui_demo_lib/serde", "egui/serde"]
 syntax_highlighting = ["egui_demo_lib/syntax_highlighting"]
 
@@ -30,11 +30,11 @@ wgpu = ["eframe/wgpu", "bytemuck"]
 
 [dependencies]
 chrono = { version = "0.4", features = ["js-sys", "wasmbind"] }
-eframe = { version = "0.20.0", path = "../eframe", default-features = false }
-egui = { version = "0.20.0", path = "../egui", features = [
+eframe = { version = "0.21.0", path = "../eframe", default-features = false }
+egui = { version = "0.21.0", path = "../egui", features = [
   "extra_debug_asserts",
 ] }
-egui_demo_lib = { version = "0.20.0", path = "../egui_demo_lib", features = [
+egui_demo_lib = { version = "0.21.0", path = "../egui_demo_lib", features = [
   "chrono",
 ] }
 tracing = "0.1"
@@ -42,7 +42,7 @@ tracing = "0.1"
 # Optional dependencies:
 
 bytemuck = { version = "1.7.1", optional = true }
-egui_extras = { version = "0.20.0", optional = true, path = "../egui_extras" }
+egui_extras = { version = "0.21.0", optional = true, path = "../egui_extras" }
 
 # feature "http":
 ehttp = { version = "0.2.0", optional = true }

crates/egui_demo_app/src/apps/custom3d_wgpu.rs

@@ -1,8 +1,8 @@
 use std::{num::NonZeroU64, sync::Arc};
 
 use eframe::{
+    egui_wgpu::wgpu::util::DeviceExt,
     egui_wgpu::{self, wgpu},
-    wgpu::util::DeviceExt,
 };
 
 pub struct Custom3d {

crates/egui_demo_app/src/apps/fractal_clock.rs

@@ -35,7 +35,7 @@ impl Default for FractalClock {
 impl FractalClock {
     pub fn ui(&mut self, ui: &mut Ui, seconds_since_midnight: Option<f64>) {
         if !self.paused {
-            self.time = seconds_since_midnight.unwrap_or_else(|| ui.input().time);
+            self.time = seconds_since_midnight.unwrap_or_else(|| ui.input(|i| i.time));
             ui.ctx().request_repaint();
         }
 

crates/egui_demo_app/src/apps/http_app.rs

@@ -131,7 +131,7 @@ fn ui_url(ui: &mut egui::Ui, frame: &mut eframe::Frame, url: &mut String) -> boo
             trigger_fetch = true;
         }
         if ui.button("Random image").clicked() {
-            let seed = ui.input().time;
+            let seed = ui.input(|i| i.time);
             let side = 640;
             *url = format!("https://picsum.photos/seed/{}/{}", seed, side);
             trigger_fetch = true;
@@ -187,7 +187,7 @@ fn ui_resource(ui: &mut egui::Ui, resource: &Resource) {
             if let Some(text) = &text {
                 let tooltip = "Click to copy the response body";
                 if ui.button("📋").on_hover_text(tooltip).clicked() {
-                    ui.output().copied_text = text.clone();
+                    ui.output_mut(|o| o.copied_text = text.clone());
                 }
                 ui.separator();
             }
@@ -245,7 +245,7 @@ impl ColoredText {
             let mut layouter = |ui: &egui::Ui, _string: &str, wrap_width: f32| {
                 let mut layout_job = self.0.clone();
                 layout_job.wrap.max_width = wrap_width;
-                ui.fonts().layout_job(layout_job)
+                ui.fonts(|f| f.layout_job(layout_job))
             };
 
             let mut text = self.0.text.as_str();
@@ -258,7 +258,7 @@ impl ColoredText {
         } else {
             let mut job = self.0.clone();
             job.wrap.max_width = ui.available_width();
-            let galley = ui.fonts().layout_job(job);
+            let galley = ui.fonts(|f| f.layout_job(job));
             let (response, painter) = ui.allocate_painter(galley.size(), egui::Sense::hover());
             painter.add(egui::Shape::galley(response.rect.min, galley));
         }

crates/egui_demo_app/src/backend_panel.rs

@@ -81,7 +81,7 @@ impl Default for BackendPanel {
 impl BackendPanel {
     pub fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
         self.frame_history
-            .on_new_frame(ctx.input().time, frame.info().cpu_usage);
+            .on_new_frame(ctx.input(|i| i.time), frame.info().cpu_usage);
 
         match self.run_mode {
             RunMode::Continuous => {
@@ -130,10 +130,12 @@ impl BackendPanel {
 
         ui.separator();
 
+        #[cfg(target_arch = "wasm32")]
+        #[cfg(feature = "web_screen-reader")]
         {
-            let mut screen_reader = ui.ctx().options().screen_reader;
+            let mut screen_reader = ui.ctx().options(|o| o.screen_reader);
             ui.checkbox(&mut screen_reader, "🔈 Screen reader").on_hover_text("Experimental feature: checking this will turn on the screen reader on supported platforms");
-            ui.ctx().options().screen_reader = screen_reader;
+            ui.ctx().options_mut(|o| o.screen_reader = screen_reader);
         }
 
         #[cfg(not(target_arch = "wasm32"))]
@@ -339,9 +341,11 @@ impl EguiWindows {
             output_event_history,
         } = self;
 
-        for event in &ctx.output().events {
-            output_event_history.push_back(event.clone());
-        }
+        ctx.output(|o| {
+            for event in &o.events {
+                output_event_history.push_back(event.clone());
+            }
+        });
         while output_event_history.len() > 1000 {
             output_event_history.pop_front();
         }

crates/egui_demo_app/src/frame_history.rs

@@ -95,19 +95,21 @@ impl FrameHistory {
             ));
             let cpu_usage = to_screen.inverse().transform_pos(pointer_pos).y;
             let text = format!("{:.1} ms", 1e3 * cpu_usage);
-            shapes.push(Shape::text(
-                &ui.fonts(),
-                pos2(rect.left(), y),
-                egui::Align2::LEFT_BOTTOM,
-                text,
-                TextStyle::Monospace.resolve(ui.style()),
-                color,
-            ));
+            shapes.push(ui.fonts(|f| {
+                Shape::text(
+                    f,
+                    pos2(rect.left(), y),
+                    egui::Align2::LEFT_BOTTOM,
+                    text,
+                    TextStyle::Monospace.resolve(ui.style()),
+                    color,
+                )
+            }));
         }
 
         let circle_color = color;
         let radius = 2.0;
-        let right_side_time = ui.input().time; // Time at right side of screen
+        let right_side_time = ui.input(|i| i.time); // Time at right side of screen
 
         for (time, cpu_usage) in history.iter() {
             let age = (right_side_time - time) as f32;

crates/egui_demo_app/src/wrap_app.rs

@@ -175,8 +175,8 @@ impl eframe::App for WrapApp {
         eframe::set_value(storage, eframe::APP_KEY, &self.state);
     }
 
-    fn clear_color(&self, visuals: &egui::Visuals) -> egui::Rgba {
-        visuals.panel_fill.into()
+    fn clear_color(&self, visuals: &egui::Visuals) -> [f32; 4] {
+        visuals.panel_fill.to_normalized_gamma_f32()
     }
 
     fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
@@ -191,10 +191,7 @@ impl eframe::App for WrapApp {
         }
 
         #[cfg(not(target_arch = "wasm32"))]
-        if ctx
-            .input_mut()
-            .consume_key(egui::Modifiers::NONE, egui::Key::F11)
-        {
+        if ctx.input_mut(|i| i.consume_key(egui::Modifiers::NONE, egui::Key::F11)) {
             frame.set_fullscreen(!frame.info().window_info.fullscreen);
         }
 
@@ -241,7 +238,8 @@ impl WrapApp {
     fn backend_panel(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
         // The backend-panel can be toggled on/off.
         // We show a little animation when the user switches it.
-        let is_open = self.state.backend_panel.open || ctx.memory().everything_is_visible();
+        let is_open =
+            self.state.backend_panel.open || ctx.memory(|mem| mem.everything_is_visible());
 
         egui::SidePanel::left("backend_panel")
             .resizable(false)
@@ -266,13 +264,13 @@ impl WrapApp {
                 .on_hover_text("Forget scroll, positions, sizes etc")
                 .clicked()
             {
-                *ui.ctx().memory() = Default::default();
+                ui.ctx().memory_mut(|mem| *mem = Default::default());
                 ui.close_menu();
             }
 
             if ui.button("Reset everything").clicked() {
                 self.state = Default::default();
-                *ui.ctx().memory() = Default::default();
+                ui.ctx().memory_mut(|mem| *mem = Default::default());
                 ui.close_menu();
             }
         });
@@ -282,7 +280,7 @@ impl WrapApp {
         let mut found_anchor = false;
         let selected_anchor = self.state.selected_anchor.clone();
         for (_name, anchor, app) in self.apps_iter_mut() {
-            if anchor == selected_anchor || ctx.memory().everything_is_visible() {
+            if anchor == selected_anchor || ctx.memory(|mem| mem.everything_is_visible()) {
                 app.update(ctx, frame);
                 found_anchor = true;
             }
@@ -316,7 +314,7 @@ impl WrapApp {
             {
                 selected_anchor = anchor.to_owned();
                 if frame.is_web() {
-                    ui.output().open_url(format!("#{}", anchor));
+                    ui.output_mut(|o| o.open_url(format!("#{}", anchor)));
                 }
             }
         }
@@ -328,7 +326,7 @@ impl WrapApp {
                 if clock_button(ui, crate::seconds_since_midnight()).clicked() {
                     self.state.selected_anchor = "clock".to_owned();
                     if frame.is_web() {
-                        ui.output().open_url("#clock");
+                        ui.output_mut(|o| o.open_url("#clock"));
                     }
                 }
             }
@@ -342,22 +340,25 @@ impl WrapApp {
         use std::fmt::Write as _;
 
         // Preview hovering files:
-        if !ctx.input().raw.hovered_files.is_empty() {
-            let mut text = "Dropping files:\n".to_owned();
-            for file in &ctx.input().raw.hovered_files {
-                if let Some(path) = &file.path {
-                    write!(text, "\n{}", path.display()).ok();
-                } else if !file.mime.is_empty() {
-                    write!(text, "\n{}", file.mime).ok();
-                } else {
-                    text += "\n???";
+        if !ctx.input(|i| i.raw.hovered_files.is_empty()) {
+            let text = ctx.input(|i| {
+                let mut text = "Dropping files:\n".to_owned();
+                for file in &i.raw.hovered_files {
+                    if let Some(path) = &file.path {
+                        write!(text, "\n{}", path.display()).ok();
+                    } else if !file.mime.is_empty() {
+                        write!(text, "\n{}", file.mime).ok();
+                    } else {
+                        text += "\n???";
+                    }
                 }
-            }
+                text
+            });
 
             let painter =
                 ctx.layer_painter(LayerId::new(Order::Foreground, Id::new("file_drop_target")));
 
-            let screen_rect = ctx.input().screen_rect();
+            let screen_rect = ctx.screen_rect();
             painter.rect_filled(screen_rect, 0.0, Color32::from_black_alpha(192));
             painter.text(
                 screen_rect.center(),
@@ -369,9 +370,11 @@ impl WrapApp {
         }
 
         // Collect dropped files:
-        if !ctx.input().raw.dropped_files.is_empty() {
-            self.dropped_files = ctx.input().raw.dropped_files.clone();
-        }
+        ctx.input(|i| {
+            if !i.raw.dropped_files.is_empty() {
+                self.dropped_files = i.raw.dropped_files.clone();
+            }
+        });
 
         // Show dropped files (if any):
         if !self.dropped_files.is_empty() {

crates/egui_demo_lib/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "egui_demo_lib"
-version = "0.20.0"
+version = "0.21.0"
 authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
 description = "Example library for egui"
 edition = "2021"
@@ -30,8 +30,8 @@ syntax_highlighting = ["syntect"]
 
 
 [dependencies]
-egui = { version = "0.20.0", path = "../egui", default-features = false }
-egui_extras = { version = "0.20.0", path = "../egui_extras" }
+egui = { version = "0.21.0", path = "../egui", default-features = false }
+egui_extras = { version = "0.21.0", path = "../egui_extras" }
 enum-map = { version = "2", features = ["serde"] }
 tracing = { version = "0.1", default-features = false, features = ["std"] }
 unicode_names2 = { version = "0.6.0", default-features = false }

crates/egui_demo_lib/benches/benchmark.rs

@@ -38,7 +38,7 @@ pub fn criterion_benchmark(c: &mut Criterion) {
 
     if false {
         let ctx = egui::Context::default();
-        ctx.memory().set_everything_is_visible(true); // give us everything
+        ctx.memory_mut(|m| m.set_everything_is_visible(true)); // give us everything
         let mut demo_windows = egui_demo_lib::DemoWindows::default();
         c.bench_function("demo_full_no_tessellate", |b| {
             b.iter(|| {

crates/egui_demo_lib/src/demo/code_editor.rs

@@ -79,7 +79,7 @@ impl super::View for CodeEditor {
             let mut layout_job =
                 crate::syntax_highlighting::highlight(ui.ctx(), &theme, string, language);
             layout_job.wrap.max_width = wrap_width;
-            ui.fonts().layout_job(layout_job)
+            ui.fonts(|f| f.layout_job(layout_job))
         };
 
         egui::ScrollArea::vertical().show(ui, |ui| {

crates/egui_demo_lib/src/demo/code_example.rs

@@ -103,7 +103,7 @@ impl CodeExample {
 
         ui.horizontal(|ui| {
             let font_id = egui::TextStyle::Monospace.resolve(ui.style());
-            let indentation = 8.0 * ui.fonts().glyph_width(&font_id, ' ');
+            let indentation = 8.0 * ui.fonts(|f| f.glyph_width(&font_id, ' '));
             let item_spacing = ui.spacing_mut().item_spacing;
             ui.add_space(indentation - item_spacing.x);
 

crates/egui_demo_lib/src/demo/dancing_strings.rs

@@ -30,7 +30,7 @@ impl super::View for DancingStrings {
 
         Frame::canvas(ui.style()).show(ui, |ui| {
             ui.ctx().request_repaint();
-            let time = ui.input().time;
+            let time = ui.input(|i| i.time);
 
             let desired_size = ui.available_width() * vec2(1.0, 0.35);
             let (_id, rect) = ui.allocate_space(desired_size);

crates/egui_demo_lib/src/demo/demo_app_windows.rs

@@ -90,6 +90,7 @@ impl Default for Tests {
     fn default() -> Self {
         Self::from_demos(vec![
             Box::new(super::tests::CursorTest::default()),
+            Box::new(super::highlighting::Highlighting::default()),
             Box::new(super::tests::IdTest::default()),
             Box::new(super::tests::InputTest::default()),
             Box::new(super::layout_test::LayoutTest::default()),
@@ -177,7 +178,7 @@ impl DemoWindows {
 
     fn mobile_ui(&mut self, ctx: &Context) {
         if self.about_is_open {
-            let screen_size = ctx.input().screen_rect.size();
+            let screen_size = ctx.input(|i| i.screen_rect.size());
             let default_width = (screen_size.x - 20.0).min(400.0);
 
             let mut close = false;
@@ -216,7 +217,7 @@ impl DemoWindows {
                 ui.menu_button(egui::RichText::new("⏷ demos").size(font_size), |ui| {
                     ui.set_style(ui.ctx().style()); // ignore the "menu" style set by `menu_button`.
                     self.demo_list_ui(ui);
-                    if ui.ui_contains_pointer() && ui.input().pointer.any_click() {
+                    if ui.ui_contains_pointer() && ui.input(|i| i.pointer.any_click()) {
                         ui.close_menu();
                     }
                 });
@@ -291,7 +292,7 @@ impl DemoWindows {
                 ui.separator();
 
                 if ui.button("Organize windows").clicked() {
-                    ui.ctx().memory().reset_areas();
+                    ui.ctx().memory_mut(|mem| mem.reset_areas());
                 }
             });
         });
@@ -309,12 +310,12 @@ fn file_menu_button(ui: &mut Ui) {
     // NOTE: we must check the shortcuts OUTSIDE of the actual "File" menu,
     // or else they would only be checked if the "File" menu was actually open!
 
-    if ui.input_mut().consume_shortcut(&organize_shortcut) {
-        ui.ctx().memory().reset_areas();
+    if ui.input_mut(|i| i.consume_shortcut(&organize_shortcut)) {
+        ui.ctx().memory_mut(|mem| mem.reset_areas());
     }
 
-    if ui.input_mut().consume_shortcut(&reset_shortcut) {
-        *ui.ctx().memory() = Default::default();
+    if ui.input_mut(|i| i.consume_shortcut(&reset_shortcut)) {
+        ui.ctx().memory_mut(|mem| *mem = Default::default());
     }
 
     ui.menu_button("File", |ui| {
@@ -335,7 +336,7 @@ fn file_menu_button(ui: &mut Ui) {
             )
             .clicked()
         {
-            ui.ctx().memory().reset_areas();
+            ui.ctx().memory_mut(|mem| mem.reset_areas());
             ui.close_menu();
         }
 
@@ -347,7 +348,7 @@ fn file_menu_button(ui: &mut Ui) {
             .on_hover_text("Forget scroll, positions, sizes etc")
             .clicked()
         {
-            *ui.ctx().memory() = Default::default();
+            ui.ctx().memory_mut(|mem| *mem = Default::default());
             ui.close_menu();
         }
     });

crates/egui_demo_lib/src/demo/drag_and_drop.rs

@@ -1,7 +1,7 @@
 use egui::*;
 
 pub fn drag_source(ui: &mut Ui, id: Id, body: impl FnOnce(&mut Ui)) {
-    let is_being_dragged = ui.memory().is_being_dragged(id);
+    let is_being_dragged = ui.memory(|mem| mem.is_being_dragged(id));
 
     if !is_being_dragged {
         let response = ui.scope(body).response;
@@ -9,10 +9,10 @@ pub fn drag_source(ui: &mut Ui, id: Id, body: impl FnOnce(&mut Ui)) {
         // Check for drags:
         let response = ui.interact(response.rect, id, Sense::drag());
         if response.hovered() {
-            ui.output().cursor_icon = CursorIcon::Grab;
+            ui.ctx().set_cursor_icon(CursorIcon::Grab);
         }
     } else {
-        ui.output().cursor_icon = CursorIcon::Grabbing;
+        ui.ctx().set_cursor_icon(CursorIcon::Grabbing);
 
         // Paint the body to a new layer:
         let layer_id = LayerId::new(Order::Tooltip, id);
@@ -37,7 +37,7 @@ pub fn drop_target<R>(
     can_accept_what_is_being_dragged: bool,
     body: impl FnOnce(&mut Ui) -> R,
 ) -> InnerResponse<R> {
-    let is_being_dragged = ui.memory().is_anything_being_dragged();
+    let is_being_dragged = ui.memory(|mem| mem.is_anything_being_dragged());
 
     let margin = Vec2::splat(4.0);
 
@@ -139,7 +139,7 @@ impl super::View for DragAndDropDemo {
                             });
                         });
 
-                        if ui.memory().is_being_dragged(item_id) {
+                        if ui.memory(|mem| mem.is_being_dragged(item_id)) {
                             source_col_row = Some((col_idx, row_idx));
                         }
                     }
@@ -153,7 +153,7 @@ impl super::View for DragAndDropDemo {
                     }
                 });
 
-                let is_being_dragged = ui.memory().is_anything_being_dragged();
+                let is_being_dragged = ui.memory(|mem| mem.is_anything_being_dragged());
                 if is_being_dragged && can_accept_what_is_being_dragged && response.hovered() {
                     drop_col = Some(col_idx);
                 }
@@ -162,7 +162,7 @@ impl super::View for DragAndDropDemo {
 
         if let Some((source_col, source_row)) = source_col_row {
             if let Some(drop_col) = drop_col {
-                if ui.input().pointer.any_released() {
+                if ui.input(|i| i.pointer.any_released()) {
                     // do the drop:
                     let item = self.columns[source_col].remove(source_row);
                     self.columns[drop_col].push(item);

crates/egui_demo_lib/src/demo/font_book.rs

@@ -93,7 +93,7 @@ impl super::View for FontBook {
                         };
 
                         if ui.add(button).on_hover_ui(tooltip_ui).clicked() {
-                            ui.output().copied_text = chr.to_string();
+                            ui.output_mut(|o| o.copied_text = chr.to_string());
                         }
                     }
                 }
@@ -103,15 +103,16 @@ impl super::View for FontBook {
 }
 
 fn available_characters(ui: &egui::Ui, family: egui::FontFamily) -> BTreeMap<char, String> {
-    ui.fonts()
-        .lock()
-        .fonts
-        .font(&egui::FontId::new(10.0, family)) // size is arbitrary for getting the characters
-        .characters()
-        .iter()
-        .filter(|chr| !chr.is_whitespace() && !chr.is_ascii_control())
-        .map(|&chr| (chr, char_name(chr)))
-        .collect()
+    ui.fonts(|f| {
+        f.lock()
+            .fonts
+            .font(&egui::FontId::new(10.0, family)) // size is arbitrary for getting the characters
+            .characters()
+            .iter()
+            .filter(|chr| !chr.is_whitespace() && !chr.is_ascii_control())
+            .map(|&chr| (chr, char_name(chr)))
+            .collect()
+    })
 }
 
 fn char_name(chr: char) -> String {

crates/egui_demo_lib/src/demo/highlighting.rs

@@ -0,0 +1,37 @@
+#[derive(Default)]
+#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
+#[cfg_attr(feature = "serde", serde(default))]
+pub struct Highlighting {}
+
+impl super::Demo for Highlighting {
+    fn name(&self) -> &'static str {
+        "Highlighting"
+    }
+
+    fn show(&mut self, ctx: &egui::Context, open: &mut bool) {
+        egui::Window::new(self.name())
+            .default_width(320.0)
+            .open(open)
+            .show(ctx, |ui| {
+                use super::View as _;
+                self.ui(ui);
+            });
+    }
+}
+
+impl super::View for Highlighting {
+    fn ui(&mut self, ui: &mut egui::Ui) {
+        ui.label("This demo demonstrates highlighting a widget.");
+        ui.add_space(4.0);
+        let label_response = ui.label("Hover me to highlight the button!");
+        ui.add_space(4.0);
+        let mut button_response = ui.button("Hover the button to highlight the label!");
+
+        if label_response.hovered() {
+            button_response = button_response.highlight();
+        }
+        if button_response.hovered() {
+            label_response.highlight();
+        }
+    }
+}

crates/egui_demo_lib/src/demo/misc_demo_window.rs

@@ -202,7 +202,7 @@ impl Widgets {
 
         ui.horizontal_wrapped(|ui| {
             // Trick so we don't have to add spaces in the text below:
-            let width = ui.fonts().glyph_width(&TextStyle::Body.resolve(ui.style()), ' ');
+            let width = ui.fonts(|f|f.glyph_width(&TextStyle::Body.resolve(ui.style()), ' '));
             ui.spacing_mut().item_spacing.x = width;
 
             ui.label(RichText::new("Text can have").color(Color32::from_rgb(110, 255, 110)));

crates/egui_demo_lib/src/demo/mod.rs

@@ -12,6 +12,7 @@ pub mod dancing_strings;
 pub mod demo_app_windows;
 pub mod drag_and_drop;
 pub mod font_book;
+pub mod highlighting;
 pub mod layout_test;
 pub mod misc_demo_window;
 pub mod multi_touch;