Add Event::Key::repeat that is set to true if the event is a repeat (#2435)

* Add `Event::Key::repeat` that is set to `true` if the event is a repeat

* Update changelog

* Improve docstring

CHANGELOG.md

@@ -5,6 +5,8 @@ NOTE: [`epaint`](crates/epaint/CHANGELOG.md), [`eframe`](crates/eframe/CHANGELOG
 
 
 ## Unreleased
+### Added ⭐
+* `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)).
 
 
 ## 0.20.1 - 2022-12-11 - Fix key-repeat

crates/eframe/src/web/events.rs

@@ -69,6 +69,7 @@ pub fn install_document_events(runner_container: &mut AppRunnerContainer) -> Res
                 runner_lock.input.raw.events.push(egui::Event::Key {
                     key,
                     pressed: true,
+                    repeat: false, // egui will fill this in for us!
                     modifiers,
                 });
             }
@@ -125,6 +126,7 @@ pub fn install_document_events(runner_container: &mut AppRunnerContainer) -> Res
                 runner_lock.input.raw.events.push(egui::Event::Key {
                     key,
                     pressed: false,
+                    repeat: false,
                     modifiers,
                 });
             }

crates/egui-winit/src/lib.rs

@@ -594,6 +594,7 @@ impl State {
                 self.egui_input.events.push(egui::Event::Key {
                     key,
                     pressed,
+                    repeat: false, // egui will fill this in for us!
                     modifiers: self.egui_input.modifiers,
                 });
             }

crates/egui/src/data/input.rs

@@ -1,7 +1,5 @@
 //! The input needed by egui.
 
-#![allow(deprecated)] // TODO(emilk): remove
-
 use crate::emath::*;
 
 /// What the integrations provides to egui at the start of each frame.
@@ -189,14 +187,19 @@ pub enum Event {
         /// Was it pressed or released?
         pressed: bool,
 
+        /// If this is a `pressed` event, is it a key-repeat?
+        ///
+        /// On many platforms, holding down a key produces many repeated "pressed" events for it, so called key-repeats.
+        /// Sometimes you will want to ignore such events, and this lets you do that.
+        ///
+        /// egui will automatically detect such repeat events and mark them as such here.
+        /// Therefore, if you are writing an egui integration, you do not need to set this (just set it to `false`).
+        repeat: bool,
+
         /// The state of the modifier keys at the time of the event.
         modifiers: Modifiers,
     },
 
-    /// DEPRECATED - DO NOT USE
-    #[deprecated = "Do not use"]
-    KeyRepeat { key: Key, modifiers: Modifiers },
-
     /// The mouse or touch moved to a new place.
     PointerMoved(Pos2),
 

crates/egui/src/input_state.rs

@@ -166,10 +166,15 @@ impl InputState {
         let mut zoom_factor_delta = 1.0;
         for event in &mut new.events {
             match event {
-                Event::Key { key, pressed, .. } => {
+                Event::Key {
+                    key,
+                    pressed,
+                    repeat,
+                    ..
+                } => {
                     if *pressed {
-                        keys_down.insert(*key);
-                        // TODO(emilk): detect key repeats and mark the event accordingly!
+                        let first_press = keys_down.insert(*key);
+                        *repeat = !first_press;
                     } else {
                         keys_down.remove(key);
                     }
@@ -263,7 +268,8 @@ impl InputState {
                 Event::Key {
                     key: ev_key,
                     modifiers: ev_mods,
-                    pressed: true
+                    pressed: true,
+                    ..
                 } if *ev_key == key && ev_mods.matches(modifiers)
             );
 

crates/egui/src/memory.rs

@@ -248,6 +248,7 @@ impl Focus {
                     key: crate::Key::Escape,
                     pressed: true,
                     modifiers: _,
+                    ..
                 }
             ) {
                 self.id = None;
@@ -259,6 +260,7 @@ impl Focus {
                 key: crate::Key::Tab,
                 pressed: true,
                 modifiers,
+                ..
             } = event
             {
                 if !self.is_focus_locked {

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

@@ -866,6 +866,7 @@ fn events(
                 key: Key::Tab,
                 pressed: true,
                 modifiers,
+                ..
             } => {
                 if multiline && ui.memory().has_lock_focus(id) {
                     let mut ccursor = delete_selected(text, &cursor_range);
@@ -899,6 +900,7 @@ fn events(
                 key: Key::Z,
                 pressed: true,
                 modifiers,
+                ..
             } if modifiers.command && !modifiers.shift => {
                 // TODO(emilk): redo
                 if let Some((undo_ccursor_range, undo_txt)) = state
@@ -917,6 +919,7 @@ fn events(
                 key,
                 pressed: true,
                 modifiers,
+                ..
             } => on_key_press(&mut cursor_range, text, galley, *key, modifiers),
 
             Event::CompositionStart => {