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egui_glium: sleep a bit when not focused

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This is to stop using all of the CPU when in minimized in
continious mode.

Fixes https://github.com/emilk/egui/issues/325
This commit is contained in:
Emil Ernerfeldt 2021-04-22 20:12:49 +02:00
parent fb6f49024f
commit 641e9c2d26
1 changed files with 15 additions and 0 deletions
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15
egui_glium/src/backend.rs
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@ -189,6 +189,8 @@ pub fn run(mut app: Box<dyn epi::App>) -> ! {
let mut clipboard = init_clipboard();
let mut current_cursor_icon = CursorIcon::Default;
let mut is_focused = true;
#[cfg(feature = "persistence")]
let mut last_auto_save = Instant::now();
@ -234,6 +236,15 @@ pub fn run(mut app: Box<dyn epi::App>) -> ! {
event_loop.run(move |event, _, control_flow| {
let mut redraw = || {
if !is_focused {
// On Mac, a minimized Window uses up all CPU: https://github.com/emilk/egui/issues/325
// We can't know if we are minimized: https://github.com/rust-windowing/winit/issues/208
// But we know if we are focused (in foreground). When minimized, we are not focused.
// However, a user may want an egui with an animation in the background,
// so we still need to repaint quite fast.
std::thread::sleep(std::time::Duration::from_millis(10));
}
let pixels_per_point = input_state
.raw
.pixels_per_point
@ -330,6 +341,10 @@ pub fn run(mut app: Box<dyn epi::App>) -> ! {
glutin::event::Event::RedrawRequested(_) if !cfg!(windows) => redraw(),
glutin::event::Event::WindowEvent { event, .. } => {
if let glutin::event::WindowEvent::Focused(new_focused) = event {
is_focused = new_focused;
}
input_to_egui(
ctx.pixels_per_point(),
event,