child window creation improvement

src/os/windows.rs

@@ -4,6 +4,8 @@ use libc;
 use Window;
 use WindowBuilder;
 use window;
+use winapi;
+use platform;
 
 /// Additional methods on `Window` that are specific to Windows.
 pub trait WindowExt {
@@ -35,3 +37,11 @@ impl WindowBuilderExt for WindowBuilder {
         self
     }
 }
+
+impl WindowBuilderExt {
+    /// Creates a new WindowProxy from a winapi::HWND
+    #[inline]
+    pub fn create_window_proxy_from_handle(handle: winapi::HWND) -> window::WindowProxy {
+        window::WindowProxy::create_proxy(platform::WindowProxy{hwnd: handle})
+    }
+}

src/platform/windows/init.rs

@@ -133,7 +133,7 @@ unsafe fn init(title: Vec<u16>, window: &WindowAttributes, pl_attribs: PlatformS
             style | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN,
             x.unwrap_or(winapi::CW_USEDEFAULT), y.unwrap_or(winapi::CW_USEDEFAULT),
             width.unwrap_or(winapi::CW_USEDEFAULT), height.unwrap_or(winapi::CW_USEDEFAULT),
-            pl_attribs.parent.map_or(ptr::null_mut(), |v| v.proxy.hwnd),
+            pl_attribs.parent.map_or(ptr::null_mut(), |v| v.get_proxy_data().hwnd),
             ptr::null_mut(), kernel32::GetModuleHandleW(ptr::null()),
             ptr::null_mut());
 

src/window.rs

@@ -361,7 +361,7 @@ impl Window {
 /// threads.
 #[derive(Clone)]
 pub struct WindowProxy {
-    pub proxy: platform::WindowProxy,
+    proxy: platform::WindowProxy,
 }
 
 impl WindowProxy {
@@ -372,6 +372,18 @@ impl WindowProxy {
     pub fn wakeup_event_loop(&self) {
         self.proxy.wakeup_event_loop();
     }
+
+    /// Returns the platform specific proxy data
+    #[inline]
+    pub fn get_proxy_data(&self) -> &platform::WindowProxy {
+        &self.proxy
+    }
+
+    /// Create a WindowProxy by directly setting its platform specific data
+    #[inline]
+    pub fn create_proxy(data: platform::WindowProxy) -> WindowProxy {
+        WindowProxy {proxy: data}
+    }
 }
 /// An iterator for the `poll_events` function.
 pub struct PollEventsIterator<'a>(platform::PollEventsIterator<'a>);