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Re-work event loop run() API so it can return a Result

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This re-works the portable `run()` API that consumes the `EventLoop` and
runs the loop on the calling thread until the app exits.

This can be supported across _all_ platforms and compared to the
previous `run() -> !` API is now able to return a `Result` status on all
platforms except iOS and Web. Fixes: #2709

By moving away from `run() -> !` we stop calling `std::process::exit()`
internally as a means to kill the process without returning which means
it's possible to return an exit status and applications can return from
their `main()` function normally.

This also fixes Android support where an Activity runs in a thread but
we can't assume to have full ownership of the process (other services
could be running in separate threads).

Additionally all examples have generally been updated so that `main()`
returns a `Result` from `run()`

Fixes: #2709
This commit is contained in:
Robert Bragg 2023-04-11 12:50:52 +01:00 • committed by Kirill Chibisov
parent a6f414d732
commit 0d366ffbda
39 changed files with 99 additions and 123 deletions
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4
examples/window_icon.rs
View file

@ -12,7 +12,7 @@ use winit::{
#[path = "util/fill.rs"]
mod fill;
fn main() {
fn main() -> Result<(), impl std::error::Error> {
SimpleLogger::new().init().unwrap();
// You'll have to choose an icon size at your own discretion. On X11, the desired size varies
@ -48,7 +48,7 @@ fn main() {
} else if let Event::RedrawRequested(_) = event {
fill::fill_window(&window);
}
});
})
}
fn load_icon(path: &Path) -> Icon {