winit-sonoma-fix/examples/web.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

143 lines
4.8 KiB
Rust

#![allow(clippy::disallowed_methods, clippy::single_match)]
use winit::{
event::{ElementState, Event, KeyEvent, WindowEvent},
event_loop::EventLoop,
keyboard::KeyCode,
window::{Fullscreen, WindowBuilder},
};
pub fn main() -> Result<(), impl std::error::Error> {
let event_loop = EventLoop::new();
let builder = WindowBuilder::new().with_title("A fantastic window!");
#[cfg(wasm_platform)]
let builder = {
use winit::platform::web::WindowBuilderExtWebSys;
builder.with_append(true)
};
let window = builder.build(&event_loop).unwrap();
#[cfg(wasm_platform)]
let log_list = wasm::insert_canvas_and_create_log_list(&window);
event_loop.run(move |event, _, control_flow| {
control_flow.set_wait();
#[cfg(wasm_platform)]
wasm::log_event(&log_list, &event);
match event {
Event::WindowEvent {
event: WindowEvent::CloseRequested,
window_id,
} if window_id == window.id() => control_flow.set_exit(),
Event::MainEventsCleared => {
window.request_redraw();
}
Event::WindowEvent {
window_id,
event:
WindowEvent::KeyboardInput {
event:
KeyEvent {
physical_key: KeyCode::KeyF,
state: ElementState::Released,
..
},
..
},
} if window_id == window.id() => {
if window.fullscreen().is_some() {
window.set_fullscreen(None);
} else {
window.set_fullscreen(Some(Fullscreen::Borderless(None)));
}
}
_ => (),
}
})
}
#[cfg(wasm_platform)]
mod wasm {
use std::num::NonZeroU32;
use softbuffer::{Surface, SurfaceExtWeb};
use wasm_bindgen::prelude::*;
use winit::{event::Event, window::Window};
#[wasm_bindgen(start)]
pub fn run() {
console_log::init_with_level(log::Level::Debug).expect("error initializing logger");
#[allow(clippy::main_recursion)]
let _ = super::main();
}
pub fn insert_canvas_and_create_log_list(window: &Window) -> web_sys::Element {
use winit::platform::web::WindowExtWebSys;
let canvas = window.canvas().unwrap();
let mut surface = Surface::from_canvas(canvas.clone()).unwrap();
surface
.resize(
NonZeroU32::new(canvas.width()).unwrap(),
NonZeroU32::new(canvas.height()).unwrap(),
)
.unwrap();
let mut buffer = surface.buffer_mut().unwrap();
buffer.fill(0xFFF0000);
buffer.present().unwrap();
let window = web_sys::window().unwrap();
let document = window.document().unwrap();
let body = document.body().unwrap();
let style = &canvas.style();
style.set_property("margin", "50px").unwrap();
// Use to test interactions with border and padding.
//style.set_property("border", "50px solid black").unwrap();
//style.set_property("padding", "50px").unwrap();
let log_header = document.create_element("h2").unwrap();
log_header.set_text_content(Some("Event Log"));
body.append_child(&log_header).unwrap();
let log_list = document.create_element("ul").unwrap();
body.append_child(&log_list).unwrap();
log_list
}
pub fn log_event(log_list: &web_sys::Element, event: &Event<()>) {
log::debug!("{:?}", event);
// Getting access to browser logs requires a lot of setup on mobile devices.
// So we implement this basic logging system into the page to give developers an easy alternative.
// As a bonus its also kind of handy on desktop.
let event = match event {
Event::WindowEvent { event, .. } => Some(format!("{event:?}")),
Event::Resumed | Event::Suspended => Some(format!("{event:?}")),
_ => None,
};
if let Some(event) = event {
let window = web_sys::window().unwrap();
let document = window.document().unwrap();
let log = document.create_element("li").unwrap();
let date = js_sys::Date::new_0();
log.set_text_content(Some(&format!(
"{:02}:{:02}:{:02}.{:03}: {event}",
date.get_hours(),
date.get_minutes(),
date.get_seconds(),
date.get_milliseconds(),
)));
log_list
.insert_before(&log, log_list.first_child().as_ref())
.unwrap();
}
}
}