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use crate::{ClosingWindow, PrimaryWindow, Window, WindowCloseRequested};
use bevy_app::AppExit;
use bevy_ecs::prelude::*;
/// Exit the application when there are no open windows.
///
/// This system is added by the [`WindowPlugin`] in the default configuration.
/// To disable this behavior, set `close_when_requested` (on the [`WindowPlugin`]) to `false`.
/// Ensure that you read the caveats documented on that field if doing so.
///
/// [`WindowPlugin`]: crate::WindowPlugin
pub fn exit_on_all_closed(mut app_exit_events: EventWriter<AppExit>, windows: Query<&Window>) {
if windows.is_empty() {
bevy_utils::tracing::info!("No windows are open, exiting");
app_exit_events.send(AppExit::Success);
}
}
/// Exit the application when the primary window has been closed
///
/// This system is added by the [`WindowPlugin`]
///
/// [`WindowPlugin`]: crate::WindowPlugin
pub fn exit_on_primary_closed(
mut app_exit_events: EventWriter<AppExit>,
windows: Query<(), (With<Window>, With<PrimaryWindow>)>,
) {
if windows.is_empty() {
bevy_utils::tracing::info!("Primary window was closed, exiting");
app_exit_events.send(AppExit::Success);
}
}
/// Close windows in response to [`WindowCloseRequested`] (e.g. when the close button is pressed).
///
/// This system is added by the [`WindowPlugin`] in the default configuration.
/// To disable this behavior, set `close_when_requested` (on the [`WindowPlugin`]) to `false`.
/// Ensure that you read the caveats documented on that field if doing so.
///
/// [`WindowPlugin`]: crate::WindowPlugin
pub fn close_when_requested(
mut commands: Commands,
mut closed: EventReader<WindowCloseRequested>,
closing: Query<Entity, With<ClosingWindow>>,
) {
// This was inserted by us on the last frame so now we can despawn the window
for window in closing.iter() {
commands.entity(window).despawn();
}
// Mark the window as closing so we can despawn it on the next frame
for event in closed.read() {
// When spamming the window close button on windows (other platforms too probably)
// we may receive a `WindowCloseRequested` for a window we've just despawned in the above
// loop.
commands.entity(event.window).try_insert(ClosingWindow);
}
}