Add request_redraw

examples/request_redraw.rs

@@ -0,0 +1,28 @@
+extern crate winit;
+use winit::{Event, WindowEvent};
+use std::time::{Instant, Duration};
+
+fn main() {
+    let events_loop = winit::EventLoop::new();
+
+    let window = winit::WindowBuilder::new()
+        .with_title("A fantastic window!")
+        .build(&events_loop)
+        .unwrap();
+
+    events_loop.run(move |event, _, control_flow| {
+        println!("{:?}", event);
+
+        match event {
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => *control_flow = winit::ControlFlow::Exit,
+            Event::EventsCleared => {
+                window.request_redraw();
+                *control_flow = winit::ControlFlow::WaitUntil(Instant::now() + Duration::new(1, 0))
+            },
+            _ => ()
+        }
+    });
+}