Improve Material ink effects

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 '../theme/shadows.dart';
 import 'dart:collection';
 import 'dart:sky' as sky;
 import 'ink_splash.dart';
 
-class Material extends Component {
-  static final List<Style> shadowStyle = [
-    null,
-    new Style('box-shadow: ${Shadow[1]}'),
-    new Style('box-shadow: ${Shadow[2]}'),
-    new Style('box-shadow: ${Shadow[3]}'),
-    new Style('box-shadow: ${Shadow[4]}'),
-    new Style('box-shadow: ${Shadow[5]}'),
-  ];
-
-  LinkedHashSet<SplashAnimation> _splashes;
+class InkWell extends Component {
+  LinkedHashSet<SplashController> _splashes;
 
   Style style;
   String inlineStyle;
   List<Node> children;
-  int level;
 
-  Material({
-      Object key,
-      this.style,
-      this.inlineStyle,
-      this.children,
-      this.level: 0 }) : super(key: key);
+  InkWell({ Object key, this.style, this.inlineStyle, this.children })
+      : super(key: key);
 
   Node build() {
     List<Node> childrenIncludingSplashes = [];
 
     if (_splashes != null) {
       childrenIncludingSplashes.addAll(
           _splashes.map((s) => new InkSplash(s.onStyleChanged)));
     }
 
     if (children != null)
       childrenIncludingSplashes.addAll(children);
 
     return new EventTarget(
       new Container(
-          style: level > 0 ? style.extend(shadowStyle[level]) : style,
+          style: style,
           inlineStyle: inlineStyle,
           children: childrenIncludingSplashes),
-      onGestureScrollStart: _cancelSplashes,
-      onWheel: _cancelSplashes,
-      onPointerDown: _startSplash
+      onGestureTapDown: _startSplash,
+      onGestureTap: _confirmSplash
     );
   }
 
   sky.ClientRect _getBoundingRect() => (getRoot() as sky.Element).getBoundingClientRect();
 
-  void _startSplash(sky.PointerEvent event) {
+  void _startSplash(sky.GestureEvent event) {
     setState(() {
-      if (_splashes == null) {
-        _splashes = new LinkedHashSet<SplashAnimation>();
-      }
-
+      if (_splashes == null)
+        _splashes = new LinkedHashSet<SplashController>();
       var splash;
-      splash = new SplashAnimation(_getBoundingRect(), event.x, event.y,
-                                   onDone: () { _splashDone(splash); });
-
+      splash = new SplashController(_getBoundingRect(), event.x, event.y,
+                                    pointer: event.primaryPointer,
+                                    onDone: () { _splashDone(splash); });
       _splashes.add(splash);
     });
   }
 
+  void _confirmSplash(sky.GestureEvent event) {
+    if (_splashes == null)
+      return;
+    _splashes.where((splash) => splash.pointer == event.primaryPointer)
+             .forEach((splash) { splash.confirm(); });
+  }
+
   void _cancelSplashes(sky.Event event) {
-    if (_splashes == null) {
+    if (_splashes == null)
       return;
-    }
-
     setState(() {
       var splashes = _splashes;
       _splashes = null;
       splashes.forEach((s) { s.cancel(); });
     });
   }
 
   void didUnmount() {
     _cancelSplashes(null);
   }
 
-  void _splashDone(SplashAnimation splash) {
-    if (_splashes == null) {
+  void _splashDone(SplashController splash) {
+    if (_splashes == null)
       return;
-    }
-
     setState(() {
       _splashes.remove(splash);
-      if (_splashes.length == 0) {
+      if (_splashes.length == 0)
         _splashes = null;
-      }
     });
   }
 }