Struct bevy::winit::WinitSettings

pub struct WinitSettings {
    pub focused_mode: UpdateMode,
    pub unfocused_mode: UpdateMode,
}

Settings for the WinitPlugin.

Fields

focused_mode: UpdateMode

Determines how frequently the application can update when it has focus.

unfocused_mode: UpdateMode

Determines how frequently the application can update when it’s out of focus.

Implementations

impl WinitSettings

pub fn game() -> WinitSettings

Default settings for games.

Continuous if windows have focus, ReactiveLowPower otherwise.

Examples found in repository

examples/window/low_power.rs (line 16)

fn main() {
    App::new()
        // Continuous rendering for games - bevy's default.
        .insert_resource(WinitSettings::game())
        // Power-saving reactive rendering for applications.
        .insert_resource(WinitSettings::desktop_app())
        // You can also customize update behavior with the fields of [`WinitConfig`]
        .insert_resource(WinitSettings {
            focused_mode: bevy::winit::UpdateMode::Continuous,
            unfocused_mode: bevy::winit::UpdateMode::ReactiveLowPower {
                wait: Duration::from_millis(10),
            },
        })
        .insert_resource(ExampleMode::Game)
        .add_plugins(DefaultPlugins.set(WindowPlugin {
            primary_window: Some(Window {
                // Turn off vsync to maximize CPU/GPU usage
                present_mode: PresentMode::AutoNoVsync,
                ..default()
            }),
            ..default()
        }))
        .add_systems(Startup, test_setup::setup)
        .add_systems(
            Update,
            (
                test_setup::cycle_modes,
                test_setup::rotate_cube,
                test_setup::update_text,
                update_winit,
            ),
        )
        .run();
}

#[derive(Resource, Debug)]
enum ExampleMode {
    Game,
    Application,
    ApplicationWithRedraw,
}

/// Update winit based on the current `ExampleMode`
fn update_winit(
    mode: Res<ExampleMode>,
    mut event: EventWriter<RequestRedraw>,
    mut winit_config: ResMut<WinitSettings>,
) {
    use ExampleMode::*;
    *winit_config = match *mode {
        Game => {
            // In the default `WinitConfig::game()` mode:
            //   * When focused: the event loop runs as fast as possible
            //   * When not focused: the event loop runs as fast as possible
            WinitSettings::game()
        }
        Application => {
            // While in `WinitConfig::desktop_app()` mode:
            //   * When focused: the app will update any time a winit event (e.g. the window is
            //     moved/resized, the mouse moves, a button is pressed, etc.), a [`RequestRedraw`]
            //     event is received, or after 5 seconds if the app has not updated.
            //   * When not focused: the app will update when the window is directly interacted with
            //     (e.g. the mouse hovers over a visible part of the out of focus window), a
            //     [`RequestRedraw`] event is received, or one minute has passed without the app
            //     updating.
            WinitSettings::desktop_app()
        }
        ApplicationWithRedraw => {
            // Sending a `RequestRedraw` event is useful when you want the app to update the next
            // frame regardless of any user input. For example, your application might use
            // `WinitConfig::desktop_app()` to reduce power use, but UI animations need to play even
            // when there are no inputs, so you send redraw requests while the animation is playing.
            event.send(RequestRedraw);
            WinitSettings::desktop_app()
        }
    };
}

pub fn desktop_app() -> WinitSettings

Default settings for desktop applications.

Reactive if windows have focus, ReactiveLowPower otherwise.

Use the EventLoopProxy to request a redraw from outside bevy.

Examples found in repository

examples/ui/ui.rs (line 17)

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        // Only run the app when there is user input. This will significantly reduce CPU/GPU use.
        .insert_resource(WinitSettings::desktop_app())
        .add_systems(Startup, setup)
        .add_systems(Update, mouse_scroll)
        .run();
}

examples/ui/button.rs (line 10)

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        // Only run the app when there is user input. This will significantly reduce CPU/GPU use.
        .insert_resource(WinitSettings::desktop_app())
        .add_systems(Startup, setup)
        .add_systems(Update, button_system)
        .run();
}

examples/ui/ui_texture_slice.rs (line 10)

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        // Only run the app when there is user input. This will significantly reduce CPU/GPU use.
        .insert_resource(WinitSettings::desktop_app())
        .add_systems(Startup, setup)
        .add_systems(Update, button_system)
        .run();
}

examples/ui/overflow.rs (line 9)

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        // Only run the app when there is user input. This will significantly reduce CPU/GPU use.
        .insert_resource(WinitSettings::desktop_app())
        .add_systems(Startup, setup)
        .add_systems(Update, update_outlines)
        .run();
}

examples/ui/relative_cursor_position.rs (line 11)

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        // Only run the app when there is user input. This will significantly reduce CPU/GPU use.
        .insert_resource(WinitSettings::desktop_app())
        .add_systems(Startup, setup)
        .add_systems(Update, relative_cursor_position_system)
        .run();
}

examples/ui/display_and_visibility.rs (line 13)

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        // Only run the app when there is user input. This will significantly reduce CPU/GPU use.
        .insert_resource(WinitSettings::desktop_app())
        .add_systems(Startup, setup)
        .add_systems(
            Update,
            (
                buttons_handler::<Display>,
                buttons_handler::<Visibility>,
                text_hover,
            ),
        )
        .run();
}

Additional examples can be found in:

• examples/ui/ui_texture_atlas.rs
• examples/ui/text_wrap_debug.rs
• examples/window/low_power.rs

pub fn update_mode(&self, focused: bool) -> &UpdateMode

Returns the current UpdateMode.

Note: The output depends on whether the window has focus or not.

Trait Implementations

impl Debug for WinitSettings

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for WinitSettings

fn default() -> WinitSettings

Returns the “default value” for a type.

impl Resource for WinitSettings

where WinitSettings: Send + Sync + 'static,