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learn-wgpu/code/beginner/tutorial1-window/src/lib.rs

63 lines
1.9 KiB
Rust

use winit::{
event::*,
event_loop::{ControlFlow, EventLoop},
window::WindowBuilder,
};
#[cfg(target_arch = "wasm32")]
use wasm_bindgen::prelude::*;
#[cfg_attr(target_arch = "wasm32", wasm_bindgen(start))]
pub fn run() {
cfg_if::cfg_if! {
if #[cfg(target_arch = "wasm32")] {
std::panic::set_hook(Box::new(console_error_panic_hook::hook));
console_log::init_with_level(log::Level::Warn).expect("Couldn't initialize logger");
} else {
env_logger::init();
}
}
let event_loop = EventLoop::new();
let window = WindowBuilder::new().build(&event_loop).unwrap();
#[cfg(target_arch = "wasm32")]
{
// Winit prevents sizing with CSS, so we have to set
// the size manually when on web.
use winit::dpi::PhysicalSize;
window.set_inner_size(PhysicalSize::new(450, 400));
use winit::platform::web::WindowExtWebSys;
web_sys::window()
.and_then(|win| win.document())
.and_then(|doc| {
let dst = doc.get_element_by_id("wasm-example")?;
let canvas = web_sys::Element::from(window.canvas());
dst.append_child(&canvas).ok()?;
Some(())
})
.expect("Couldn't append canvas to document body.");
}
event_loop.run(move |event, _, control_flow| match event {
Event::WindowEvent {
ref event,
window_id,
} if window_id == window.id() => match event {
WindowEvent::CloseRequested
| WindowEvent::KeyboardInput {
input:
KeyboardInput {
state: ElementState::Pressed,
virtual_keycode: Some(VirtualKeyCode::Escape),
..
},
..
} => *control_flow = ControlFlow::Exit,
_ => {}
},
_ => {}
});
}