Launch a blank window for the editor

editor/src/lib.rs

@@ -2,7 +2,43 @@ use std::io;
 
 /// The editor is actually launched from the CLI if you pass it zero arguments.
 pub fn launch() -> io::Result<()> {
-    println!("TODO launch the editor.");
+    // TODO do any initialization here
+
+    run_event_loop();
 
     Ok(())
 }
+
+use winit::{
+    event::{Event, WindowEvent},
+    event_loop::{ControlFlow, EventLoop},
+    window::WindowBuilder,
+};
+
+fn run_event_loop() {
+    let event_loop = EventLoop::new();
+    let window = WindowBuilder::new().build(&event_loop).unwrap();
+
+    event_loop.run(move |event, _, control_flow| {
+        // TODO try ControlFlow::Poll and see if it affects input latency.
+        // Otherwise, this seems like a better default for minimizing idle
+        // CPU usage and battry drain. (Might want to switch to Poll whenever
+        // there are animations in progress though.)
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => {
+                println!("Thank you for flying Roc Airlines!");
+                *control_flow = ControlFlow::Exit
+            }
+            Event::MainEventsCleared => window.request_redraw(),
+            Event::RedrawRequested(_) => {
+                // TODO render the editor
+            }
+            _ => (),
+        }
+    });
+}