revert unnecessary changes

com.unity.uiwidgets/Runtime/rendering/proxy_box.cs

         public override bool needsCompositing {
             get { return base.needsCompositing || _annotationIsActive; }
         }
-
-        ImageFilter _filter;
-
+        
-            if (child != null) {
-                if (_annotationIsActive) {
-                    Debug.Log("paint 1 >>>>>");
-                    layer = layer ?? new AnnotatedRegionLayer<MouseTrackerAnnotation>(
-                        _hoverAnnotation,
-                        size: size,
-                        offset: offset,
-                        opaque: opaque // TODO
+            if (_annotationIsActive) {
+                var layer = new AnnotatedRegionLayer<MouseTrackerAnnotation>(
+                    _hoverAnnotation,
+                    size: size,
+                    offset: offset,
+                    opaque: opaque
-                    context.pushLayer(layer, base.paint, offset);
-                }
-                else {
-                    Debug.Log("paint 2 >>>>>");
-                    base.paint(context, offset);
-                }
+                context.pushLayer(layer, base.paint, offset);
-                layer = null;
+                base.paint(context, offset);
             }
         }
 

com.unity.uiwidgets/Runtime/widgets/basic.cs

             properties.add(new FloatProperty("aspectRatio", aspectRatio));
         }
     }
-/*
+
     public class MouseRegion : StatefulWidget {
         public MouseRegion(
             Key key = null,
         public override Widget build(BuildContext context) {
             return new _RawMouseRegion(this);
         }
-    }*/
+    }
-    public class MouseRegion : SingleChildRenderObjectWidget {
-        public MouseRegion(
-            Key key = null,
-            PointerEnterEventListener onEnter = null,
-            PointerExitEventListener onExit = null,
-            PointerHoverEventListener onHover = null,
-            bool opaque = true,
-            Widget child = null
-            ) : base(key: key, child: child) {
-            this.onEnter = onEnter;
-            this.onExit = onExit;
-            this.onHover = onHover;
-            this.opaque = opaque;
+    public class _RawMouseRegion : SingleChildRenderObjectWidget {
+        public _RawMouseRegion(_MouseRegionState owner) : base(child: owner.widget.child) {
+            this.owner = owner;
-        public readonly PointerEnterEventListener onEnter;
-        public readonly PointerHoverEventListener onHover;
-        public readonly PointerExitEventListener onExit;
-        public readonly bool opaque;
-        
-        void handleExit(PointerExitEvent _event) {
-            if (onExit != null) {
-                onExit(_event);
-            }
-        }
-
-        public PointerExitEventListener getHandleExit() {
-            return onExit == null ? (PointerExitEventListener) null : handleExit;
-        }
+        public readonly _MouseRegionState owner;
+            MouseRegion widget = owner.widget;
-                onEnter: onEnter,
-                onHover: onHover,
-                onExit: getHandleExit(),
-                opaque: opaque
+                onEnter: widget.onEnter,
+                onHover: widget.onHover,
+                onExit: owner.getHandleExit(),
+                opaque: widget.opaque
-            _renderObject.onEnter = onEnter;
-            _renderObject.onHover = onHover;
-            _renderObject.onExit = getHandleExit();
-            _renderObject.opaque = opaque;
+            MouseRegion widget = owner.widget; 
+            _renderObject.onEnter = widget.onEnter;
+            _renderObject.onHover = widget.onHover;
+            _renderObject.onExit = owner.getHandleExit();
+            _renderObject.opaque = widget.opaque;
         }
     }