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Call logic even while browser tab is in background (#8257)

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* Closes https://github.com/emilk/egui/issues/5112

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Lucas Meurer
2026-06-25 14:59:45 +02:00
committed by GitHub
parent 26ead4af21
commit 2e26b70ae9
10 changed files with 277 additions and 14 deletions
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30
crates/eframe/src/web/events.rs
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@@ -113,12 +113,32 @@ fn install_blur_focus(runner_ref: &WebRunner, target: &EventTarget) -> Result<()
// NOTE: because of the text agent we sometime miss 'blur' events,
// so we also poll the focus state each frame in `AppRunner::logic`.
for event_name in ["blur", "focus", "visibilitychange"] {
let closure = move |_event: web_sys::MouseEvent, runner: &mut AppRunner| {
log::trace!("{} {event_name:?}", runner.canvas().id());
runner.update_focus();
};
let closure =
move |_event: web_sys::MouseEvent, runner: &mut AppRunner, web_runner: &WebRunner| {
log::trace!("{} {event_name:?}", runner.canvas().id());
runner.update_focus();
runner_ref.add_event_listener(target, event_name, closure)?;
if event_name == "visibilitychange" {
// The tab was hidden or shown. An in-flight `requestAnimationFrame` is paused
// while hidden, so reschedule the paint loop using the scheduling mechanism
// (`setTimeout` vs `requestAnimationFrame`) appropriate for the new state.
// This keeps `App::update` running while hidden, and switches back to smooth
// animation frames once visible again.
if let Err(err) = web_runner.reschedule_frame() {
log::error!(
"Failed to reschedule frame on visibility change: {}",
super::string_from_js_value(&err)
);
}
}
};
runner_ref.add_event_listener_ex(
target,
event_name,
&web_sys::AddEventListenerOptions::default(),
closure,
)?;
}
Ok(())
}