Added KeyRepeat event. (#2389)

KeyPress no longer repeats.

Co-authored-by: Mike Krueger <mkrueger@posteo.de>

crates/egui/src/data/input.rs

@@ -191,6 +191,14 @@ pub enum Event {
         modifiers: Modifiers,
     },
 
+    /// A key was repeated while pressed.
+    KeyRepeat {
+        key: Key,
+
+        /// The state of the modifier keys at the time of the event.
+        modifiers: Modifiers,
+    },
+
     /// The mouse or touch moved to a new place.
     PointerMoved(Pos2),
 

crates/egui/src/input_state.rs

@@ -164,26 +164,36 @@ impl InputState {
         let mut keys_down = self.keys_down;
         let mut scroll_delta = Vec2::ZERO;
         let mut zoom_factor_delta = 1.0;
-        new.events.retain(|event| match event {
-            Event::Key { key, pressed, .. } => {
-                if *pressed {
-                    // We only retain presses that are novel (i.e. the first Press event, not those generated by key-repeat)
-                    keys_down.insert(*key)
-                } else {
-                    keys_down.remove(key);
-                    true
+        for event in &mut new.events {
+            match event {
+                Event::Key {
+                    key,
+                    pressed,
+                    modifiers,
+                } => {
+                    if *pressed {
+                        // We only retain presses that are novel (i.e. the first Press event, not those generated by key-repeat)
+                        // key repeats are represented by KeyRepeat.
+                        if !keys_down.insert(*key) {
+                            *event = Event::KeyRepeat {
+                                key: *key,
+                                modifiers: *modifiers,
+                            };
+                        }
+                    } else {
+                        keys_down.remove(key);
+                    }
                 }
+                Event::Scroll(delta) => {
+                    scroll_delta += *delta;
+                }
+                Event::Zoom(factor) => {
+                    zoom_factor_delta *= *factor;
+                }
+                _ => {}
             }
-            Event::Scroll(delta) => {
-                scroll_delta += *delta;
-                true
-            }
-            Event::Zoom(factor) => {
-                zoom_factor_delta *= *factor;
-                true
-            }
-            _ => true,
-        });
+        }
+
         InputState {
             pointer,
             touch_states: self.touch_states,