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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 import 'dart:math' as math; | 5 import 'dart:math' as math; |
6 import 'dart:sky' as sky; | 6 import 'dart:sky' as sky; |
7 | 7 |
8 import '../animation/generators.dart'; | 8 import '../animation/generators.dart'; |
9 import '../animation/mechanics.dart'; | 9 import '../animation/mechanics.dart'; |
10 import '../animation/scroll_behavior.dart'; | 10 import '../animation/scroll_behavior.dart'; |
11 import '../theme2/edges.dart'; | 11 import '../theme2/edges.dart'; |
12 import '../theme2/view_configuration.dart' as config; | 12 import '../theme2/view_configuration.dart' as config; |
13 import 'material.dart'; | 13 import 'material.dart'; |
14 import 'wrappers.dart'; | 14 import 'basic.dart'; |
15 | 15 |
16 const double _kMillisecondsPerSecond = 1000.0; | 16 const double _kMillisecondsPerSecond = 1000.0; |
17 | 17 |
18 double _velocityForFlingGesture(sky.GestureEvent event) { | 18 double _velocityForFlingGesture(sky.GestureEvent event) { |
19 return math.max(-config.kMaxFlingVelocity, math.min(config.kMaxFlingVelocity, | 19 return math.max(-config.kMaxFlingVelocity, math.min(config.kMaxFlingVelocity, |
20 -event.velocityY)) / _kMillisecondsPerSecond; | 20 -event.velocityY)) / _kMillisecondsPerSecond; |
21 } | 21 } |
22 | 22 |
23 abstract class ScrollClient { | 23 abstract class ScrollClient { |
24 bool ancestorScrolled(Scrollable ancestor); | 24 bool ancestorScrolled(Scrollable ancestor); |
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149 | 149 |
150 void _handleFlingCancel(sky.GestureEvent event) { | 150 void _handleFlingCancel(sky.GestureEvent event) { |
151 _startSimulation(_createParticle()); | 151 _startSimulation(_createParticle()); |
152 } | 152 } |
153 | 153 |
154 void _handleWheel(sky.WheelEvent event) { | 154 void _handleWheel(sky.WheelEvent event) { |
155 scrollBy(-event.offsetY); | 155 scrollBy(-event.offsetY); |
156 } | 156 } |
157 | 157 |
158 } | 158 } |
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