clear unused functions + refine flutter mouse tracker => leave then enter

Author: zhuxingwei

Runtime/gestures/binding.cs

@@ -109,51 +109,6 @@ void _handlePointerScrollEvent(PointerEvent evt) {
             this.dispatchEvent(evt, result);
         }
 
-        void _handlePointerHoverEvent(PointerEvent evt) {
-            HitTestResult result = new HitTestResult();
-            this.hitTest(result, evt.position);
-
-            D.assert(this._enteredTargets.Count == 0);
-            foreach (var hitTestEntry in result.path) {
-                if (this.lastMoveTargets.Contains(hitTestEntry.target)) {
-                    hitTestEntry.target.handleEvent(evt, hitTestEntry);
-                    this.lastMoveTargets.Remove(hitTestEntry.target);
-                }
-                else {
-                    this._enteredTargets.Add(hitTestEntry);
-                }
-            }
-
-            //leave events
-            foreach (var lastMoveTarget in this.lastMoveTargets) {
-                lastMoveTarget.handleEvent(new PointerExitEvent(
-                    timeStamp: evt.timeStamp,
-                    pointer: evt.pointer,
-                    device: evt.device,
-                    kind: evt.kind
-                ), null);
-            }
-
-            //enter events
-            foreach (var hitTestEntry in this._enteredTargets) {
-                hitTestEntry.target.handleEvent(new PointerEnterEvent(
-                    timeStamp: evt.timeStamp,
-                    pointer: evt.pointer,
-                    device: evt.device,
-                    kind: evt.kind
-                ), hitTestEntry);
-            }
-
-            this.lastMoveTargets.Clear();
-            foreach (var hitTestEntry in result.path) {
-                this.lastMoveTargets.Add(hitTestEntry.target);
-            }
-
-            this._enteredTargets.Clear();
-
-            this.dispatchEvent(evt, result);
-        }
-
         public virtual void hitTest(HitTestResult result, Offset position) {
             result.add(new HitTestEntry(this));
         }

Runtime/gestures/mouse_tracking.cs

@@ -168,17 +168,7 @@ void exitAllDevices(_TrackedAnnotation trackedAnnotation) {
                 }
 
                 _TrackedAnnotation hitAnnotation = this._findAnnotation(hit);
-                if (!hitAnnotation.activeDevices.Contains(deviceId)) {
-                    hitAnnotation.activeDevices.Add(deviceId);
-                    if (hitAnnotation.annotation?.onEnter != null) {
-                        hitAnnotation.annotation.onEnter(PointerEnterEvent.fromHoverEvent(lastEvent));
-                    }
-                }
-
-                if (hitAnnotation.annotation?.onHover != null) {
-                    hitAnnotation.annotation.onHover(PointerHoverEvent.fromHoverEvent(lastEvent));
-                }
-
+                //leave
                 foreach (_TrackedAnnotation trackedAnnotation in this._trackedAnnotations.Values) {
                     if (hitAnnotation == trackedAnnotation) {
                         continue;
@@ -192,6 +182,19 @@ void exitAllDevices(_TrackedAnnotation trackedAnnotation) {
                         trackedAnnotation.activeDevices.Remove(deviceId);
                     }
                 }
+                
+                //enter
+                if (!hitAnnotation.activeDevices.Contains(deviceId)) {
+                    hitAnnotation.activeDevices.Add(deviceId);
+                    if (hitAnnotation.annotation?.onEnter != null) {
+                        hitAnnotation.annotation.onEnter(PointerEnterEvent.fromHoverEvent(lastEvent));
+                    }
+                }
+
+                //hover
+                if (hitAnnotation.annotation?.onHover != null) {
+                    hitAnnotation.annotation.onHover(PointerHoverEvent.fromHoverEvent(lastEvent));
+                }
             }
         }
     }