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Deprecate window creation with stale event loop

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Creating window when event loop is not running generally doesn't work,
since a bunch of events and sync OS requests can't be processed. This
is also an issue on e.g. Android, since window can't be created outside
event loop easily.

Thus deprecate the window creation when event loop is not running,
as well as other resource creation to running event loop.

Given that all the examples use the bad pattern of creating the window
when event loop is not running and also most example existence is
questionable, since they show single thing and the majority of their
code is window/event loop initialization, they wore merged into
a single example 'window.rs' example that showcases very simple
application using winit.

Fixes #3399.
This commit is contained in:
Kirill Chibisov 2024-01-31 17:29:59 +04:00
parent 19190a95a0
commit 3fb93b4f83
90 changed files with 1594 additions and 3495 deletions
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27
examples/control_flow.rs
View file

@ -37,17 +37,14 @@ fn main() -> Result<(), impl std::error::Error> {
println!("Press 'Esc' to close the window.");
let event_loop = EventLoop::new().unwrap();
let window = Window::builder()
.with_title("Press 1, 2, 3 to change control flow mode. Press R to toggle redraw requests.")
.build(&event_loop)
.unwrap();
let mut mode = Mode::Wait;
let mut request_redraw = false;
let mut wait_cancelled = false;
let mut close_requested = false;
event_loop.run(move |event, elwt| {
let mut window = None;
event_loop.run(move |event, event_loop| {
use winit::event::StartCause;
println!("{event:?}");
match event {
@ -57,6 +54,12 @@ fn main() -> Result<(), impl std::error::Error> {
_ => false,
}
}
Event::Resumed => {
let window_attributes = Window::default_attributes().with_title(
"Press 1, 2, 3 to change control flow mode. Press R to toggle redraw requests.",
);
window = Some(event_loop.create_window(window_attributes).unwrap());
}
Event::WindowEvent { event, .. } => match event {
WindowEvent::CloseRequested => {
close_requested = true;
@ -94,32 +97,34 @@ fn main() -> Result<(), impl std::error::Error> {
_ => (),
},
WindowEvent::RedrawRequested => {
fill::fill_window(&window);
let window = window.as_ref().unwrap();
window.pre_present_notify();
fill::fill_window(window);
}
_ => (),
},
Event::AboutToWait => {
if request_redraw && !wait_cancelled && !close_requested {
window.request_redraw();
window.as_ref().unwrap().request_redraw();
}
match mode {
Mode::Wait => elwt.set_control_flow(ControlFlow::Wait),
Mode::Wait => event_loop.set_control_flow(ControlFlow::Wait),
Mode::WaitUntil => {
if !wait_cancelled {
elwt.set_control_flow(ControlFlow::WaitUntil(
event_loop.set_control_flow(ControlFlow::WaitUntil(
time::Instant::now() + WAIT_TIME,
));
}
}
Mode::Poll => {
thread::sleep(POLL_SLEEP_TIME);
elwt.set_control_flow(ControlFlow::Poll);
event_loop.set_control_flow(ControlFlow::Poll);
}
};
if close_requested {
elwt.exit();
event_loop.exit();
}
}
_ => (),