winit-sonoma-fix/examples/touchpad_gestures.rs
Robert Bragg 0d366ffbda Re-work event loop run() API so it can return a Result
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
2023-07-28 03:04:32 +04:00

52 lines
1.6 KiB
Rust

use simple_logger::SimpleLogger;
use winit::{
event::{Event, WindowEvent},
event_loop::{ControlFlow, EventLoop},
window::WindowBuilder,
};
#[path = "util/fill.rs"]
mod fill;
fn main() -> Result<(), impl std::error::Error> {
SimpleLogger::new().init().unwrap();
let event_loop = EventLoop::new();
let window = WindowBuilder::new()
.with_title("Touchpad gestures")
.build(&event_loop)
.unwrap();
println!("Only supported on macOS at the moment.");
event_loop.run(move |event, _, control_flow| {
*control_flow = ControlFlow::Wait;
if let Event::WindowEvent { event, .. } = event {
match event {
WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
WindowEvent::TouchpadMagnify { delta, .. } => {
if delta > 0.0 {
println!("Zoomed in {delta}");
} else {
println!("Zoomed out {delta}");
}
}
WindowEvent::SmartMagnify { .. } => {
println!("Smart zoom");
}
WindowEvent::TouchpadRotate { delta, .. } => {
if delta > 0.0 {
println!("Rotated counterclockwise {delta}");
} else {
println!("Rotated clockwise {delta}");
}
}
_ => (),
}
} else if let Event::RedrawRequested(_) = event {
fill::fill_window(&window);
}
})
}