Merge branch 'Tryibion-add-button-hover-events'

Source/Engine/UI/GUI/Common/Button.cs

@@ -71,6 +71,16 @@ namespace FlaxEngine.GUI
         /// </summary>
         public event Action<Button> ButtonClicked;
 
+        /// <summary>
+        /// Event fired when users mouse enters the control.
+        /// </summary>
+        public event Action HoverBegin;
+        
+        /// <summary>
+        /// Event fired when users mouse leaves the control.
+        /// </summary>
+        public event Action HoverEnd;
+
         /// <summary>
         /// Gets or sets the brush used for background drawing.
         /// </summary>
@@ -232,6 +242,13 @@ namespace FlaxEngine.GUI
             Render2D.DrawText(_font?.GetFont(), TextMaterial, _text, clientRect, textColor, TextAlignment.Center, TextAlignment.Center);
         }
 
+        /// <inheritdoc />
+        public override void OnMouseEnter(Float2 location)
+        {
+            base.OnMouseEnter(location);
+            HoverBegin?.Invoke();
+        }
+
         /// <inheritdoc />
         public override void OnMouseLeave()
         {
@@ -239,6 +256,8 @@ namespace FlaxEngine.GUI
             {
                 OnPressEnd();
             }
+            
+            HoverEnd?.Invoke();
 
             base.OnMouseLeave();
         }