Add a Resize method to OSWindow.

util/OSWindow.h

@@ -33,8 +33,9 @@ class OSWindow
     void pushEvent(Event event);
 
     virtual void setMousePosition(int x, int y) = 0;
+    virtual bool resize(int width, int height) = 0;
 
-  private:
+  protected:
     int mWidth;
     int mHeight;
 

util/win32/Win32Window.cpp

@@ -474,3 +474,22 @@ OSWindow *CreateOSWindow()
 {
     return new Win32Window();
 }
+
+bool Win32Window::resize(int width, int height)
+{
+    RECT windowRect;
+    if (!GetWindowRect(mNativeWindow, &windowRect))
+    {
+        return false;
+    }
+
+    if (!MoveWindow(mNativeWindow, windowRect.left, windowRect.top, width, height, FALSE))
+    {
+        return false;
+    }
+
+    mWidth = width;
+    mHeight = height;
+
+    return true;
+}

util/win32/Win32Window.h

@@ -29,6 +29,7 @@ class Win32Window : public OSWindow
     void pushEvent(Event event);
 
     void setMousePosition(int x, int y);
+    bool resize(int width, int height);
 
   private:
     std::string mClassName;