BaseWidget: Renamed GrabKeyboard to SetFocus, added ClearFocus and focus virtual methods

SDK/include/NDK/BaseWidget.hpp

@@ -40,6 +40,8 @@ namespace Ndk
 			inline void CenterHorizontal();
 			inline void CenterVertical();
 
+			void ClearFocus();
+
 			inline void Destroy();
 
 			void EnableBackground(bool enable);
@@ -56,13 +58,12 @@ namespace Ndk
 
 			inline bool IsVisible() const;
 
-			void GrabKeyboard();
-
 			virtual void ResizeToContent() = 0;
 
 			void SetBackgroundColor(const Nz::Color& color);
 			void SetCursor(Nz::SystemCursor systemCursor);
 			inline void SetContentSize(const Nz::Vector2f& size);
+			void SetFocus();
 			inline void SetPadding(float left, float top, float right, float bottom);
 			void SetSize(const Nz::Vector2f& size);
 
@@ -85,6 +86,8 @@ namespace Ndk
 			virtual void Layout();
 			void InvalidateNode() override;
 
+			virtual void OnFocusLost();
+			virtual void OnFocusReceived();
 			virtual void OnKeyPressed(const Nz::WindowEvent::KeyEvent& key);
 			virtual void OnKeyReleased(const Nz::WindowEvent::KeyEvent& key);
 			virtual void OnMouseEnter();

SDK/include/NDK/Canvas.hpp

@@ -34,6 +34,8 @@ namespace Ndk
 			Canvas& operator=(Canvas&&) = delete;
 
 		protected:
+			inline void ClearKeyboardOwner(std::size_t canvasIndex);
+			
 			inline void NotifyWidgetBoxUpdate(std::size_t index);
 			inline void NotifyWidgetCursorUpdate(std::size_t index);
 

SDK/include/NDK/Canvas.inl

@@ -46,6 +46,12 @@ namespace Ndk
 		return m_world;
 	}
 
+	inline void Canvas::ClearKeyboardOwner(std::size_t canvasIndex)
+	{
+		if (m_keyboardOwner == canvasIndex)
+			SetKeyboardOwner(InvalidCanvasIndex);
+	}
+
 	inline void Canvas::NotifyWidgetBoxUpdate(std::size_t index)
 	{
 		WidgetBox& entry = m_widgetBoxes[index];
@@ -67,6 +73,12 @@ namespace Ndk
 
 	inline void Canvas::SetKeyboardOwner(std::size_t canvasIndex)
 	{
+		if (m_keyboardOwner != InvalidCanvasIndex)
+			m_widgetBoxes[m_keyboardOwner].widget->OnFocusLost();
+
 		m_keyboardOwner = canvasIndex;
+
+		if (m_keyboardOwner != InvalidCanvasIndex)
+			m_widgetBoxes[m_keyboardOwner].widget->OnFocusReceived();
 	}
 }