eframe: rename quit/exit to "close" (#1943)

Since https://github.com/emilk/egui/pull/1919 we can continue
the application after closing the native window. It therefore makes
more sense to call `frame.close()` to close the native window,
instead of `frame.quit()`.

crates/eframe/CHANGELOG.md

@@ -24,6 +24,7 @@ NOTE: [`egui-winit`](../egui-winit/CHANGELOG.md), [`egui_glium`](../egui_glium/C
 * Fixed mouse cursor change on Linux ([#1747](https://github.com/emilk/egui/pull/1747)).
 * Added `Frame::set_visible` ([#1808](https://github.com/emilk/egui/pull/1808)).
 * Added fullscreen support ([#1866](https://github.com/emilk/egui/pull/1866)).
+* `Frame::quit` has been renamed to `Frame::close` and `App::on_exit_event` is now `App::on_close_event` ([#1943](https://github.com/emilk/egui/pull/1943)).
 
 #### Web:
 * Added ability to stop/re-run web app from JavaScript. ⚠️ You need to update your CSS with `html, body: { height: 100%; width: 100%; }` ([#1803](https://github.com/emilk/egui/pull/1650)).

crates/eframe/src/epi.rs

@@ -67,21 +67,25 @@ pub trait App {
     /// where `APPNAME` is what is given to `eframe::run_native`.
     fn save(&mut self, _storage: &mut dyn Storage) {}
 
-    /// Called before an exit that can be aborted.
+    /// Called when the user attempts to close the desktop window and/or quit the application.
-    /// By returning `false` the exit will be aborted. To continue the exit return `true`.
+    ///
+    /// By returning `false` the closing will be aborted. To continue the closing return `true`.
     ///
     /// A scenario where this method will be run is after pressing the close button on a native
     /// window, which allows you to ask the user whether they want to do something before exiting.
     /// See the example at <https://github.com/emilk/egui/blob/master/examples/confirm_exit/> for practical usage.
     ///
     /// It will _not_ be called on the web or when the window is forcefully closed.
-    fn on_exit_event(&mut self) -> bool {
+    #[cfg(not(target_arch = "wasm32"))]
+    #[doc(alias = "exit")]
+    #[doc(alias = "quit")]
+    fn on_close_event(&mut self) -> bool {
         true
     }
 
     /// Called once on shutdown, after [`Self::save`].
     ///
-    /// If you need to abort an exit use [`Self::on_exit_event`].
+    /// If you need to abort an exit use [`Self::on_close_event`].
     ///
     /// To get a [`glow`] context you need to compile with the `glow` feature flag,
     /// and run eframe with the glow backend.
@@ -90,7 +94,7 @@ pub trait App {
 
     /// Called once on shutdown, after [`Self::save`].
     ///
-    /// If you need to abort an exit use [`Self::on_exit_event`].
+    /// If you need to abort an exit use [`Self::on_close_event`].
     #[cfg(not(feature = "glow"))]
     fn on_exit(&mut self) {}
 
@@ -571,11 +575,24 @@ impl Frame {
         self.wgpu_render_state.as_ref()
     }
 
-    /// Signal the app to stop/exit/quit the app (only works for native apps, not web apps).
+    /// Tell `eframe` to close the desktop window.
-    /// The framework will not quit immediately, but at the end of the this frame.
+    ///
+    /// The window will not close immediately, but at the end of the this frame.
+    ///
+    /// Calling this will likely result in the app quitting, unless
+    /// you have more code after the call to [`crate::run_native`].
     #[cfg(not(target_arch = "wasm32"))]
+    #[doc(alias = "exit")]
+    #[doc(alias = "quit")]
+    pub fn close(&mut self) {
+        self.output.close = true;
+    }
+
+    /// Tell `eframe` to close the desktop window.
+    #[cfg(not(target_arch = "wasm32"))]
+    #[deprecated = "Renamed `close`"]
     pub fn quit(&mut self) {
-        self.output.quit = true;
+        self.close();
     }
 
     /// Set the desired inner size of the window (in egui points).
@@ -797,10 +814,9 @@ pub(crate) mod backend {
     #[derive(Clone, Debug, Default)]
     #[must_use]
     pub struct AppOutput {
-        /// Set to `true` to stop the app.
+        /// Set to `true` to close the native window (which often quits the app).
-        /// This does nothing for web apps.
         #[cfg(not(target_arch = "wasm32"))]
-        pub quit: bool,
+        pub close: bool,
 
         /// Set to some size to resize the outer window (e.g. glium window) to this size.
         #[cfg(not(target_arch = "wasm32"))]

crates/eframe/src/native/epi_integration.rs

@@ -115,7 +115,7 @@ pub fn handle_app_output(
     app_output: epi::backend::AppOutput,
 ) {
     let epi::backend::AppOutput {
-        quit: _,
+        close: _,
         window_size,
         window_title,
         decorated,
@@ -183,8 +183,8 @@ pub struct EpiIntegration {
     pub egui_ctx: egui::Context,
     pending_full_output: egui::FullOutput,
     egui_winit: egui_winit::State,
-    /// When set, it is time to quit
+    /// When set, it is time to close the native window.
-    quit: bool,
+    close: bool,
     can_drag_window: bool,
 }
 
@@ -228,7 +228,7 @@ impl EpiIntegration {
             egui_ctx,
             egui_winit,
             pending_full_output: Default::default(),
-            quit: false,
+            close: false,
             can_drag_window: false,
         }
     }
@@ -243,17 +243,17 @@ impl EpiIntegration {
         self.egui_ctx.clear_animations();
     }
 
-    /// If `true`, it is time to shut down.
+    /// If `true`, it is time to close the native window.
-    pub fn should_quit(&self) -> bool {
+    pub fn should_close(&self) -> bool {
-        self.quit
+        self.close
     }
 
     pub fn on_event(&mut self, app: &mut dyn epi::App, event: &winit::event::WindowEvent<'_>) {
         use winit::event::{ElementState, MouseButton, WindowEvent};
 
         match event {
-            WindowEvent::CloseRequested => self.quit = app.on_exit_event(),
+            WindowEvent::CloseRequested => self.close = app.on_close_event(),
-            WindowEvent::Destroyed => self.quit = true,
+            WindowEvent::Destroyed => self.close = true,
             WindowEvent::MouseInput {
                 button: MouseButton::Left,
                 state: ElementState::Pressed,
@@ -285,8 +285,8 @@ impl EpiIntegration {
             let mut app_output = self.frame.take_app_output();
             app_output.drag_window &= self.can_drag_window; // Necessary on Windows; see https://github.com/emilk/egui/pull/1108
             self.can_drag_window = false;
-            if app_output.quit {
+            if app_output.close {
-                self.quit = app.on_exit_event();
+                self.close = app.on_close_event();
             }
             handle_app_output(window, self.egui_ctx.pixels_per_point(), app_output);
         }

crates/eframe/src/native/run.rs

@@ -373,7 +373,7 @@ mod glow_integration {
                 gl_window.swap_buffers().unwrap();
             }
 
-            let control_flow = if integration.should_quit() {
+            let control_flow = if integration.should_close() {
                 EventResult::Exit
             } else if repaint_after.is_zero() {
                 EventResult::RepaintAsap
@@ -426,7 +426,7 @@ mod glow_integration {
                             self.gl_window.resize(**new_inner_size);
                         }
                         winit::event::WindowEvent::CloseRequested
-                            if self.integration.should_quit() =>
+                            if self.integration.should_close() =>
                         {
                             return EventResult::Exit
                         }
@@ -435,7 +435,7 @@ mod glow_integration {
 
                     self.integration.on_event(self.app.as_mut(), &event);
 
-                    if self.integration.should_quit() {
+                    if self.integration.should_close() {
                         EventResult::Exit
                     } else {
                         // TODO(emilk): ask egui if the event warrants a repaint
@@ -624,7 +624,7 @@ mod wgpu_integration {
 
             integration.post_rendering(app.as_mut(), window);
 
-            let control_flow = if integration.should_quit() {
+            let control_flow = if integration.should_close() {
                 EventResult::Exit
             } else if repaint_after.is_zero() {
                 EventResult::RepaintAsap
@@ -690,7 +690,7 @@ mod wgpu_integration {
                                 .on_window_resized(new_inner_size.width, new_inner_size.height);
                         }
                         winit::event::WindowEvent::CloseRequested
-                            if self.integration.should_quit() =>
+                            if self.integration.should_close() =>
                         {
                             return EventResult::Exit
                         }
@@ -698,7 +698,7 @@ mod wgpu_integration {
                     };
 
                     self.integration.on_event(self.app.as_mut(), &event);
-                    if self.integration.should_quit() {
+                    if self.integration.should_close() {
                         EventResult::Exit
                     } else {
                         // TODO(emilk): ask egui if the event warrants a repaint

crates/egui_demo_app/src/backend_panel.rs

@@ -140,7 +140,7 @@ impl BackendPanel {
         {
             ui.separator();
             if ui.button("Quit").clicked() {
-                frame.quit();
+                frame.close();
             }
         }
     }

examples/confirm_exit/src/main.rs

@@ -13,14 +13,14 @@ fn main() {
 
 #[derive(Default)]
 struct MyApp {
-    can_exit: bool,
+    allowed_to_close: bool,
-    is_exiting: bool,
+    show_confirmation_dialog: bool,
 }
 
 impl eframe::App for MyApp {
-    fn on_exit_event(&mut self) -> bool {
+    fn on_close_event(&mut self) -> bool {
-        self.is_exiting = true;
+        self.show_confirmation_dialog = true;
-        self.can_exit
+        self.allowed_to_close
     }
 
     fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
@@ -28,19 +28,20 @@ impl eframe::App for MyApp {
             ui.heading("Try to close the window");
         });
 
-        if self.is_exiting {
+        if self.show_confirmation_dialog {
+            // Show confirmation dialog:
             egui::Window::new("Do you want to quit?")
                 .collapsible(false)
                 .resizable(false)
                 .show(ctx, |ui| {
                     ui.horizontal(|ui| {
-                        if ui.button("Not yet").clicked() {
+                        if ui.button("Cancel").clicked() {
-                            self.is_exiting = false;
+                            self.show_confirmation_dialog = false;
                         }
 
                         if ui.button("Yes!").clicked() {
-                            self.can_exit = true;
+                            self.allowed_to_close = true;
-                            frame.quit();
+                            frame.close();
                         }
                     });
                 });

examples/custom_window_frame/src/main.rs

@@ -89,7 +89,7 @@ fn custon_window_frame(
                 Button::new(RichText::new("❌").size(height - 4.0)).frame(false),
             );
             if close_response.clicked() {
-                frame.quit();
+                frame.close();
             }
 
             // Interact with the title bar (drag to move window):

examples/serial_windows/src/main.rs

@@ -46,7 +46,7 @@ impl eframe::App for MyApp {
         egui::CentralPanel::default().show(ctx, |ui| {
             if ui.button("Close").clicked() {
                 eprintln!("Pressed Close button");
-                frame.quit();
+                frame.close();
             }
         });
     }