Add WindowId type

src/api_transition.rs

@@ -31,7 +31,7 @@ macro_rules! gen_api_transition {
                 for window in windows.iter() {
                     for event in window.poll_events() {
                         callback(::Event::WindowEvent {
-                            window_id: &**window as *const Window as usize,
+                            window_id: ::WindowId(WindowId(&**window as *const Window as usize)),
                             event: event,
                         })
                     }
@@ -54,6 +54,9 @@ macro_rules! gen_api_transition {
             }
         }
 
+        #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+        pub struct WindowId(usize);
+
         pub struct Window2 {
             pub window: ::std::sync::Arc<Window>,
             events_loop: ::std::sync::Weak<EventsLoop>,
@@ -81,8 +84,8 @@ macro_rules! gen_api_transition {
             }
 
             #[inline]
-            pub fn id(&self) -> usize {
-                &*self.window as *const Window as usize
+            pub fn id(&self) -> WindowId {
+                WindowId(&*self.window as *const Window as usize)
             }
         }
 

src/events.rs

@@ -1,9 +1,10 @@
 use std::path::PathBuf;
+use WindowId;
 
 #[derive(Clone, Debug)]
 pub enum Event {
     WindowEvent {
-        window_id: usize,
+        window_id: WindowId,
         event: WindowEvent,
     }
 }

src/lib.rs

@@ -161,6 +161,15 @@ pub struct Window {
     window: platform::Window2,
 }
 
+/// Identifier of a window. Unique for each window.
+///
+/// Can be obtained with `window.id()`.
+///
+/// Whenever you receive an event specific to a window, this event contains a `WindowId` which you
+/// can then compare to the ids of your windows.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct WindowId(platform::WindowId);
+
 /// Provides a way to retreive events from the windows that were registered to it.
 // TODO: document usage in multiple threads
 pub struct EventsLoop {

src/window.rs

@@ -7,6 +7,7 @@ use EventsLoop;
 use MouseCursor;
 use Window;
 use WindowBuilder;
+use WindowId;
 use native_monitor::NativeMonitorId;
 
 use libc;
@@ -293,8 +294,8 @@ impl Window {
     }
 
     #[inline]
-    pub fn id(&self) -> usize {
-        self.window.id()
+    pub fn id(&self) -> WindowId {
+        WindowId(self.window.id())
     }
 }