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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 '../animation/generators.dart'; | 5 import '../animation/generators.dart'; |
6 import '../animation/mechanics.dart'; | 6 import '../animation/mechanics.dart'; |
7 import '../animation/scroll_behavior.dart'; | 7 import '../animation/scroll_behavior.dart'; |
8 import '../fn2.dart'; | 8 import '../fn2.dart'; |
9 import '../theme/view_configuration.dart' as config; | 9 import '../theme/view_configuration.dart' as config; |
10 import 'dart:math' as math; | 10 import 'dart:math' as math; |
11 import 'dart:sky' as sky; | 11 import 'dart:sky' as sky; |
12 | 12 |
13 const double _kMillisecondsPerSecond = 1000.0; | 13 const double _kMillisecondsPerSecond = 1000.0; |
14 | 14 |
15 double _velocityForFlingGesture(sky.GestureEvent event) { | 15 double _velocityForFlingGesture(sky.GestureEvent event) { |
16 return math.max(-config.kMaxFlingVelocity, math.min(config.kMaxFlingVelocity, | 16 return math.max(-config.kMaxFlingVelocity, math.min(config.kMaxFlingVelocity, |
17 -event.velocityY)) / _kMillisecondsPerSecond; | 17 -event.velocityY)) / _kMillisecondsPerSecond; |
18 } | 18 } |
19 | 19 |
20 abstract class ScrollClient { | 20 abstract class ScrollClient { |
21 bool ancestorScrolled(Scrollable ancestor); | 21 bool ancestorScrolled(Scrollable ancestor); |
22 } | 22 } |
23 | 23 |
24 abstract class Scrollable extends Component { | 24 abstract class Scrollable extends Component { |
25 | 25 |
26 Scrollable({Object key}) : super(key: key) { | 26 Scrollable({Object key}) : super(key: key, stateful: true) { |
27 onDidUnmount(_stopSimulation); | 27 onDidUnmount(_stopSimulation); |
28 } | 28 } |
29 | 29 |
30 double _scrollOffset = 0.0; | 30 double _scrollOffset = 0.0; |
31 double get scrollOffset => _scrollOffset; | 31 double get scrollOffset => _scrollOffset; |
32 | 32 |
33 ScrollBehavior _scrollBehavior; | 33 ScrollBehavior _scrollBehavior; |
34 ScrollBehavior createScrollBehavior(); | 34 ScrollBehavior createScrollBehavior(); |
35 ScrollBehavior get scrollBehavior { | 35 ScrollBehavior get scrollBehavior { |
36 if (_scrollBehavior == null) | 36 if (_scrollBehavior == null) |
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138 | 138 |
139 void _handleFlingCancel(sky.GestureEvent event) { | 139 void _handleFlingCancel(sky.GestureEvent event) { |
140 _startSimulation(_createParticle()); | 140 _startSimulation(_createParticle()); |
141 } | 141 } |
142 | 142 |
143 void _handleWheel(sky.WheelEvent event) { | 143 void _handleWheel(sky.WheelEvent event) { |
144 scrollBy(-event.offsetY); | 144 scrollBy(-event.offsetY); |
145 } | 145 } |
146 | 146 |
147 } | 147 } |
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