cs/Switch using deferToChild (#331)

* switch to defer to child

* simplify the set states

Author: changanxian

lib/samples/match_viewpoint_of_geo_views/match_viewpoint_of_geo_views.dart

@@ -75,20 +75,23 @@ class _MatchViewpointOfGeoViewsState extends State<MatchViewpointOfGeoViews>
     );
   }
 
+  void updateViewInteraction(bool isMapViewInteraction) {
+    setState(() {
+      _isMapViewInteraction = isMapViewInteraction;
+      _isSceneViewInteraction = !isMapViewInteraction;
+    });
+  }
+
   List<Widget> getViews() {
     return [
       // Add a map view to the widget tree and set a controller.
       Expanded(
         child: GestureDetector(
-          behavior: HitTestBehavior.translucent,
-          onTapDown: (_) => setState(() {
-            _isMapViewInteraction = true;
-            _isSceneViewInteraction = false;
-          }),
-          onDoubleTapDown: (_) => setState(() {
-            _isMapViewInteraction = true;
-            _isSceneViewInteraction = false;
-          }),
+          behavior: HitTestBehavior.deferToChild,
+          onTapDown: (_) => updateViewInteraction(true),
+          onDoubleTapDown: (_) => updateViewInteraction(true),
+          onLongPressDown: (_) => updateViewInteraction(true),
+          onScaleStart:(_) => updateViewInteraction(true),
           child: ArcGISMapView(
             controllerProvider: () => _mapViewController,
             onMapViewReady: onMapViewReady,
@@ -98,16 +101,11 @@ class _MatchViewpointOfGeoViewsState extends State<MatchViewpointOfGeoViews>
       // Add a scene view to the widget tree and set a controller.
       Expanded(
         child: GestureDetector(
-          behavior: HitTestBehavior.translucent,
-          onDoubleTapDown: (_) => setState(() {
-            _isMapViewInteraction = false;
-            _isSceneViewInteraction = true;
-          }),
-          onTapDown: (_) => setState(() {
-            _isMapViewInteraction = false;
-            _isSceneViewInteraction = true;
-          }),
-
+          behavior: HitTestBehavior.deferToChild,
+          onTapDown: (_) => updateViewInteraction(false),
+          onDoubleTapDown: (_) => updateViewInteraction(false),
+          onLongPressDown: (_) => updateViewInteraction(false),
+          onScaleStart:(_) => updateViewInteraction(false),
           child: ArcGISSceneView(
             controllerProvider: () => _sceneViewController,
             onSceneViewReady: onSceneViewReady,