Fix examples

examples/multiwindow.rs

@@ -1,34 +1,33 @@
 extern crate winit;
 
-use std::thread;
-
 fn main() {
-    let window1 = winit::WindowBuilder::new().build().unwrap();
-    let window2 = winit::WindowBuilder::new().build().unwrap();
-    let window3 = winit::WindowBuilder::new().build().unwrap();
+    let events_loop = winit::EventsLoop::new();
 
-    let t1 = thread::spawn(move || {
-        run(window1);
-    });
+    let window1 = winit::Window::new(&events_loop).unwrap();
+    let window2 = winit::Window::new(&events_loop).unwrap();
+    let window3 = winit::Window::new(&events_loop).unwrap();
 
-    let t2 = thread::spawn(move || {
-        run(window2);
-    });
+    let mut num_windows = 3;
 
-    let t3 = thread::spawn(move || {
-        run(window3);
-    });
-
-    let _ = t1.join();
-    let _ = t2.join();
-    let _ = t3.join();
-}
-
-fn run(window: winit::Window) {
-    for event in window.wait_events() {
+    events_loop.run_forever(|event| {
         match event {
-            winit::Event::Closed => break,
-            _ => ()
+            winit::Event::WindowEvent { event: winit::WindowEvent::Closed, window_id } => {
+                if window_id == window1.id() {
+                    println!("Window 1 has been closed")
+                } else if window_id == window2.id() {
+                    println!("Window 2 has been closed")
+                } else if window_id == window3.id() {
+                    println!("Window 3 has been closed");
+                } else {
+                    unreachable!()
+                }
+
+                num_windows -= 1;
+                if num_windows == 0 {
+                    events_loop.interrupt();
+                }
+            },
+            _ => (),
         }
-    }
+    })
 }