Add widget state support.

src/ui/ui_elements/ui_events/MouseEvent.h

@@ -11,7 +11,10 @@ public:
     enum class Action
     {
         Pressed,
-        Released
+        Released,
+        Move,
+        Enter,
+        Leave
     };
 
 public:

src/ui/ui_elements/ui_events/UiEvent.cpp

@@ -16,7 +16,7 @@ std::unique_ptr<UiEvent> UiEvent::Create()
     return std::make_unique<UiEvent>();
 }
 
-UiEvent::Type UiEvent::GetType() const
+UiEvent::Type UiEvent::getType() const
 {
     return mType;
 }

src/ui/ui_elements/ui_events/UiEvent.h

@@ -5,26 +5,38 @@
 class UiEvent
 {
 public:
-
-    enum class Type{
+    enum class Type {
         Unknown,
         Paint,
         Mouse,
         Keyboard,
-        Resize
+        Resize,
+        Focus
     };
 
-protected:
-    UiEvent::Type mType;
-
-public:
-
     UiEvent();
 
     virtual ~UiEvent();
 
     static std::unique_ptr<UiEvent> Create();
 
-    Type GetType() const;
+    Type getType() const;
+
+protected:
+    UiEvent::Type mType;
 };
 using UiEventUPtr = std::unique_ptr<UiEvent>;
+
+class FocusEvent : public UiEvent
+{
+public:
+    FocusEvent()
+        : UiEvent()
+    {
+
+    };
+
+    virtual ~FocusEvent() = default;
+};
+
+