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This was adopted from #12878. I rebased the changes resolved the following merge conflicts: - moved over the changes originally done in bevy_winit/src/lib.rs's `handle_winit_event` into bevy_winit/src/state.rs's `window_event` function - moved WinitEvent::KeyboardFocusLost event forwarding originally done in bevy_winit/src/winit_event.rs to the equivalent in bevy_winit/src/state.rs Tested this by following the modified keyboard_input example from the original PR. First, I verified I could reproduce the issue without the changes. Then, after applying the changes, I verified that when I Alt+Tabbed away from the running example that the log showed I released Alt and when I tabbed back it didn't behave like Alt was stuck. The following is from the original pull request by @gavlig # Objective This helps avoiding stuck key presses after switching from and back to Bevy window. Key press event gets stuck because window loses focus before receiving a key release event thus we end up with false positive in ButtonInput. ## Solution I saw two ways to fix this: 1. add bevy_window as dependency and read WindowFocus events 2. add a KeyboardFocusLost event specifically for this. I chose the latter because adding another dependency felt wrong, but if that is more preferable changing this pr won't be a problem. Also if someone sees another way please let me know. To test the bug use this small modification over examples/keyboard_input.rs: (it will work only if you have Alt-Tab combination for switching between windows in your OS, otherwise change AltLeft accordingly) ``` //! Demonstrates handling a key press/release. use bevy::{prelude::*, input:⌨️:KeyboardInput}; fn main() { App::new() .add_plugins(DefaultPlugins) .add_systems(Update, keyboard_input_system) .run(); } /// This system prints 'Alt' key state fn keyboard_input_system(keyboard_input: Res<ButtonInput<KeyCode>>, mut keyboard_input_events: EventReader<KeyboardInput>) { for event in keyboard_input_events.read() { info!("{:?}", event); } if keyboard_input.pressed(KeyCode::AltLeft) { info!("'Alt' currently pressed"); } if keyboard_input.just_pressed(KeyCode::AltLeft) { info!("'Alt' just pressed"); } if keyboard_input.just_released(KeyCode::AltLeft) { info!("'Alt' just released"); } } ``` Here i made a quick video with demo of the fix: https://youtu.be/qTvUCk4IHvo In first part i press Alt and Alt+Tab to switch back and forth from example app, logs will indicate that too. In second part I applied fix and you'll see that Alt will no longer be pressed when window gets unfocused ## Migration Guide `WinitEvent` has a new enum variant: `WinitEvent::KeyboardFocusLost`. Co-authored-by: gavlig <gavlig@gmail.com> |
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Bevy Input
