Add window resize handling on Mac

Source/Engine/Platform/Mac/MacWindow.cpp

@@ -181,6 +181,13 @@ Vector2 GetMousePosition(MacWindow* window, NSEvent* event)
     Window->Close(ClosingReason::User);
 }
 
+- (void)windowDidResize:(NSNotification*)notification
+{
+    NSView* view = [self contentView];
+    NSRect contextRect = [view frame];
+    Window->CheckForResize((float)contextRect.size.width, (float)contextRect.size.height);
+}
+
 - (void)setWindow:(MacWindow*)window
 {
     Window = window;
@@ -466,6 +473,16 @@ MacWindow::~MacWindow()
     _window = nullptr;
 }
 
+void MacWindow::CheckForResize(float width, float height)
+{
+    const Vector2 clientSize(width, height);
+	if (clientSize != _clientSize)
+	{
+        _clientSize = clientSize;
+		OnResize(width, height);
+	}
+}
+
 void* MacWindow::GetNativePtr() const
 {
     return _window;

Source/Engine/Platform/Mac/MacWindow.h

@@ -22,6 +22,8 @@ public:
 	MacWindow(const CreateWindowSettings& settings);
 	~MacWindow();
 
+    void CheckForResize(float width, float height);
+
 public:
 
 	// [Window]