[Effen] Reduce splashes when scrolling.

sky/framework/components/ink_well.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import '../fn.dart';
 import 'dart:collection';
 import 'dart:sky' as sky;
 import 'ink_splash.dart';
+import 'scrollable.dart';
 
-class InkWell extends Component {
+class InkWell extends Component implements ScrollNotifiee {

[eseidel, 2015/04/20 22:45:04]

ScrollClient?  ScrollDelegate?

[Hixie, 2015/04/20 22:49:40]

Changed all occurrences of Notifiee to Client.

   static final Style _containmentStyleHack = new Style('''
     transform: translateX(0);''');
 
   LinkedHashSet<SplashController> _splashes;
 
   String inlineStyle;
   List<UINode> children;
 
   InkWell({ Object key, this.inlineStyle, this.children })
       : super(key: key) {
@@ skipping 27 matching lines @@
 
   void _startSplash(sky.GestureEvent event) {
     setState(() {
       if (_splashes == null)
         _splashes = new LinkedHashSet<SplashController>();
       var splash;
       splash = new SplashController(_getBoundingRect(), event.x, event.y,
                                     pointer: event.primaryPointer,
                                     onDone: () { _splashDone(splash); });
       _splashes.add(splash);
+      var node = parent;

[eseidel, 2015/04/20 22:45:04]

Types?

+      while (node != null) {
+        if (node is Scrollable)
+          node.registerScrollNotifiee(this);
+        node = node.parent;
+      }
     });
   }
 
+  bool ancestorScrolled(Scrollable ancestor) {
+    _abortSplashes();
+    return false;
+  }
+
+  void handleRemoved() {
+    var node = parent;
+    while (node != null) {
+      if (node is Scrollable)
+        node.unregisterScrollNotifiee(this);
+      node = node.parent;
+    }
+    super.handleRemoved();
+  }
+
   void _confirmSplash(sky.GestureEvent event) {
     if (_splashes == null)
       return;
     _splashes.where((splash) => splash.pointer == event.primaryPointer)
              .forEach((splash) { splash.confirm(); });
   }
 
+  void _abortSplashes() {
+    if (_splashes == null)
+      return;
+    setState(() {
+      _splashes.forEach((s) { s.abort(); });
+    });
+  }
+
   void _cancelSplashes(sky.Event event) {
     if (_splashes == null)
       return;
     setState(() {
       var splashes = _splashes;
       _splashes = null;
       splashes.forEach((s) { s.cancel(); });
     });
   }
 
   void _splashDone(SplashController splash) {
     if (_splashes == null)
       return;
     setState(() {
       _splashes.remove(splash);
       if (_splashes.length == 0)
         _splashes = null;
     });
   }
 }