capture mouse on drag and track mouse entry/exit

hw3d/Mouse.cpp

@@ -36,6 +36,11 @@ int Mouse::GetPosY() const noexcept
 	return y;
 }
 
+bool Mouse::IsInWindow() const noexcept
+{
+	return isInWindow;
+}
+
 bool Mouse::LeftIsPressed() const noexcept
 {
 	return leftIsPressed;
@@ -74,6 +79,20 @@ void Mouse::OnMouseMove( int newx,int newy ) noexcept
 	TrimBuffer();
 }
 
+void Mouse::OnMouseLeave() noexcept
+{
+	isInWindow = false;
+	buffer.push( Mouse::Event( Mouse::Event::Type::Leave,*this ) );
+	TrimBuffer();
+}
+
+void Mouse::OnMouseEnter() noexcept
+{
+	isInWindow = true;
+	buffer.push( Mouse::Event( Mouse::Event::Type::Enter,*this ) );
+	TrimBuffer();
+}
+
 void Mouse::OnLeftPressed( int x,int y ) noexcept
 {
 	leftIsPressed = true;

hw3d/Mouse.h

@@ -37,6 +37,8 @@ public:
 			WheelUp,
 			WheelDown,
 			Move,
+			Enter,
+			Leave,
 			Invalid
 		};
 	private:
@@ -98,6 +100,7 @@ public:
 	std::pair<int,int> GetPos() const noexcept;
 	int GetPosX() const noexcept;
 	int GetPosY() const noexcept;
+	bool IsInWindow() const noexcept;
 	bool LeftIsPressed() const noexcept;
 	bool RightIsPressed() const noexcept;
 	Mouse::Event Read() noexcept;
@@ -108,6 +111,8 @@ public:
 	void Flush() noexcept;
 private:
 	void OnMouseMove( int x,int y ) noexcept;
+	void OnMouseLeave() noexcept;
+	void OnMouseEnter() noexcept;
 	void OnLeftPressed( int x,int y ) noexcept;
 	void OnLeftReleased( int x,int y ) noexcept;
 	void OnRightPressed( int x,int y ) noexcept;
@@ -121,5 +126,6 @@ private:
 	int y;
 	bool leftIsPressed = false;
 	bool rightIsPressed = false;
+	bool isInWindow = false;
 	std::queue<Event> buffer;
 };
\ No newline at end of file

hw3d/Window.cpp

@@ -175,7 +175,30 @@ LRESULT Window::HandleMsg( HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam ) noex
 	case WM_MOUSEMOVE:
 	{
 		const POINTS pt = MAKEPOINTS( lParam );
-		mouse.OnMouseMove( pt.x,pt.y );
+		// in client region -> log move, and log enter + capture mouse (if not previously in window)
+		if( pt.x >= 0 && pt.x < width && pt.y >= 0 && pt.y < height )
+		{
+			mouse.OnMouseMove( pt.x,pt.y );
+			if( !mouse.IsInWindow() )
+			{
+				SetCapture( hWnd );
+				mouse.OnMouseEnter();
+			}
+		}
+		// not in client -> log move / maintain capture if button down
+		else
+		{
+			if( wParam & (MK_LBUTTON | MK_RBUTTON) )
+			{
+				mouse.OnMouseMove( pt.x,pt.y );
+			}
+			// button up -> release capture / log event for leaving
+			else
+			{
+				ReleaseCapture();
+				mouse.OnMouseLeave();
+			}
+		}
 		break;
 	}
 	case WM_LBUTTONDOWN:
@@ -194,12 +217,24 @@ LRESULT Window::HandleMsg( HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam ) noex
 	{
 		const POINTS pt = MAKEPOINTS( lParam );
 		mouse.OnLeftReleased( pt.x,pt.y );
+		// release mouse if outside of window
+		if( pt.x < 0 || pt.x >= width || pt.y < 0 || pt.y >= height )
+		{
+			ReleaseCapture();
+			mouse.OnMouseLeave();
+		}
 		break;
 	}
 	case WM_RBUTTONUP:
 	{
 		const POINTS pt = MAKEPOINTS( lParam );
 		mouse.OnRightReleased( pt.x,pt.y );
+		// release mouse if outside of window
+		if( pt.x < 0 || pt.x >= width || pt.y < 0 || pt.y >= height )
+		{
+			ReleaseCapture();
+			mouse.OnMouseLeave();
+		}
 		break;
 	}
 	case WM_MOUSEWHEEL: