Mercurial > demo / ui/src/lib.rs

 #[cfg(target_arch="wasm32")]
 use wasm_bindgen::prelude::*;
 use winit::{
     event::*,
     event_loop::{ControlFlow, EventLoop},
     window::WindowBuilder,
 };
 
 #[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,
             _ => {}
         },
         _ => {}
     });
 }