3fb93b4f83
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.
76 lines
2.3 KiB
Rust
76 lines
2.3 KiB
Rust
#![allow(clippy::single_match)]
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// Limit this example to only compatible platforms.
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#[cfg(any(
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windows_platform,
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macos_platform,
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x11_platform,
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wayland_platform,
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android_platform,
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))]
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fn main() -> std::process::ExitCode {
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use std::{process::ExitCode, thread::sleep, time::Duration};
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use simple_logger::SimpleLogger;
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use winit::{
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event::{Event, WindowEvent},
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event_loop::EventLoop,
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platform::pump_events::{EventLoopExtPumpEvents, PumpStatus},
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window::Window,
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};
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#[path = "util/fill.rs"]
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mod fill;
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let mut event_loop = EventLoop::new().unwrap();
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SimpleLogger::new().init().unwrap();
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let mut window = None;
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loop {
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let timeout = Some(Duration::ZERO);
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let status = event_loop.pump_events(timeout, |event, event_loop| {
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if let Event::WindowEvent { event, .. } = &event {
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// Print only Window events to reduce noise
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println!("{event:?}");
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}
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match event {
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Event::Resumed => {
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let window_attributes =
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Window::default_attributes().with_title("A fantastic window!");
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window = Some(event_loop.create_window(window_attributes).unwrap());
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}
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Event::WindowEvent { event, .. } => {
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let window = window.as_ref().unwrap();
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match event {
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WindowEvent::CloseRequested => event_loop.exit(),
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WindowEvent::RedrawRequested => fill::fill_window(window),
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_ => (),
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}
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}
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Event::AboutToWait => {
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window.as_ref().unwrap().request_redraw();
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}
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_ => (),
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}
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});
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if let PumpStatus::Exit(exit_code) = status {
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break ExitCode::from(exit_code as u8);
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}
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// Sleep for 1/60 second to simulate application work
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//
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// Since `pump_events` doesn't block it will be important to
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// throttle the loop in the app somehow.
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println!("Update()");
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sleep(Duration::from_millis(16));
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}
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}
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#[cfg(any(ios_platform, web_platform, orbital_platform))]
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fn main() {
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println!("This platform doesn't support pump_events.");
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}
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