Update example in README.md and add move prefix to window.rs example …

…closure (rust-windowing#921)

* Update example in README.md and add move prefix to window.rs example

* Make Window and README example trivially capture window

* Update README.md

README.md

@@ -32,18 +32,21 @@ another library.
 
 ```rust
 extern crate winit;
+use winit::window::WindowBuilder;
+use winit::event::{Event, WindowEvent};
+use winit::event_loop::{EventLoop, ControlFlow};
 
 fn main() {
-    let mut event_loop = winit::EventLoop::new();
-    let window = winit::Window::new(&event_loop).unwrap();
+    let event_loop = EventLoop::new();
+    let window = WindowBuilder::new().build(&event_loop).unwrap();
 
-    event_loop.run(|event| {
+    event_loop.run(move |event, _, control_flow| {
         match event {
-            winit::Event::WindowEvent {
-              event: winit::WindowEvent::CloseRequested,
-              ..
-            } => winit::ControlFlow::Break,
-            _ => winit::ControlFlow::Continue,
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                window_id,
+            } if window_id == window.id() => *control_flow = ControlFlow::Exit,
+            _ => *control_flow = ControlFlow::Wait,
         }
     });
 }

examples/window.rs

@@ -6,19 +6,19 @@ use winit::event_loop::{EventLoop, ControlFlow};
 fn main() {
     let event_loop = EventLoop::new();
 
-    let _window = WindowBuilder::new()
+    let window = WindowBuilder::new()
         .with_title("A fantastic window!")
         .build(&event_loop)
         .unwrap();
 
-    event_loop.run(|event, _, control_flow| {
+    event_loop.run(move |event, _, control_flow| {
         println!("{:?}", event);
 
         match event {
             Event::WindowEvent {
                 event: WindowEvent::CloseRequested,
-                ..
-            } => *control_flow = ControlFlow::Exit,
+                window_id,
+            } if window_id == window.id() => *control_flow = ControlFlow::Exit,
             _ => *control_flow = ControlFlow::Wait,
         }
     });