add Layer::SetSwallowEvents

minor optimize

Kiwano/2d/Layer.cpp

@@ -25,17 +25,20 @@
 namespace kiwano
 {
 	Layer::Layer()
+		: swallow_(false)
 	{
 		SetSize(Renderer::Instance().GetOutputSize());
 
-		AddListener(Event::MouseBtnDown, MakeClosure(this, &Layer::HandleMessages));
-		AddListener(Event::MouseBtnUp, MakeClosure(this, &Layer::HandleMessages));
-		AddListener(Event::MouseMove, MakeClosure(this, &Layer::HandleMessages));
-		AddListener(Event::MouseWheel, MakeClosure(this, &Layer::HandleMessages));
+		auto handler = MakeClosure(this, &Layer::HandleMessages);
 
-		AddListener(Event::KeyDown, MakeClosure(this, &Layer::HandleMessages));
-		AddListener(Event::KeyUp, MakeClosure(this, &Layer::HandleMessages));
-		AddListener(Event::Char, MakeClosure(this, &Layer::HandleMessages));
+		AddListener(Event::MouseBtnDown, handler);
+		AddListener(Event::MouseBtnUp, handler);
+		AddListener(Event::MouseMove, handler);
+		AddListener(Event::MouseWheel, handler);
+
+		AddListener(Event::KeyDown, handler);
+		AddListener(Event::KeyUp, handler);
+		AddListener(Event::Char, handler);
 	}
 
 	Layer::~Layer()
@@ -47,12 +50,15 @@ namespace kiwano
 		if (!IsVisible())
 			return;
 
+		if (!swallow_)
+		{
 			NodePtr prev;
 			for (auto child = children_.Last(); child; child = prev)
 			{
 				prev = child->PrevItem();
 				child->Dispatch(evt);
 			}
+		}
 
 		EventDispatcher::Dispatch(evt);
 	}

Kiwano/2d/Layer.h

@@ -40,10 +40,16 @@ namespace kiwano
 		virtual void OnKeyUp(int key) {}
 		virtual void OnChar(char c) {}
 
+		// ÍÌûÏûÏ¢
+		inline void SetSwallowEvents(bool enabled) { swallow_ = enabled; }
+
 	public:
 		void Dispatch(Event& evt) override;
 
 	protected:
 		void HandleMessages(Event const& evt);
+
+	protected:
+		bool swallow_;
 	};
 }

Kiwano/imgui/ImGuiLayer.cpp

@@ -35,6 +35,7 @@ namespace kiwano
 	ImGuiLayer::ImGuiLayer()
 	{
 		target_window_ = Renderer::Instance().GetTargetWindow();
+		SetSwallowEvents(true);
 	}
 
 	ImGuiLayer::~ImGuiLayer()