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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 import 'dart:async'; | |
| 6 import 'dart:math' as math; | |
| 7 import 'dart:sky' as sky; | |
| 8 | |
| 9 import '../animation/animated_value.dart'; | |
| 10 import '../painting/box_painter.dart'; | |
| 11 import '../theme2/colors.dart'; | |
| 12 import '../theme2/shadows.dart'; | |
| 13 import 'animated_component.dart'; | |
| 14 import 'popup_menu_item.dart'; | |
| 15 import 'basic.dart'; | |
| 16 | |
| 17 const double _kMenuOpenDuration = 300.0; | |
| 18 const double _kMenuCloseDuration = 200.0; | |
| 19 const double _kMenuCloseDelay = 100.0; | |
| 20 | |
| 21 enum MenuState { hidden, opening, open, closing } | |
| 22 | |
| 23 class PopupMenuController { | |
| 24 AnimatedValue position = new AnimatedValue(0.0); | |
| 25 MenuState _state = MenuState.hidden; | |
| 26 MenuState get state => _state; | |
| 27 | |
| 28 bool get canReact => (_state == MenuState.opening) || (_state == MenuState.ope
n); | |
| 29 | |
| 30 open() async { | |
| 31 if (_state != MenuState.hidden) | |
| 32 return; | |
| 33 _state = MenuState.opening; | |
| 34 if (await position.animateTo(1.0, _kMenuOpenDuration) == 1.0) | |
| 35 _state = MenuState.open; | |
| 36 } | |
| 37 | |
| 38 Future _closeState; | |
| 39 close() async { | |
| 40 var result = new Completer(); | |
| 41 _closeState = result.future; | |
| 42 if ((_state == MenuState.opening) || (_state == MenuState.open)) { | |
| 43 _state = MenuState.closing; | |
| 44 await position.animateTo(0.0, _kMenuCloseDuration, initialDelay: _kMenuClo
seDelay); | |
| 45 _state = MenuState.hidden; | |
| 46 _closeState = null; | |
| 47 result.complete(); | |
| 48 return result.future; | |
| 49 } | |
| 50 assert(_closeState != null); | |
| 51 return _closeState; | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 class PopupMenu extends AnimatedComponent { | |
| 56 | |
| 57 PopupMenu({ Object key, this.controller, this.items, this.level }) | |
| 58 : super(key: key) { | |
| 59 _painter = new BoxPainter(new BoxDecoration( | |
| 60 backgroundColor: Grey[50], | |
| 61 borderRadius: 2.0, | |
| 62 boxShadow: shadows[level])); | |
| 63 | |
| 64 animate(controller.position, (double value) { | |
| 65 _position = value; | |
| 66 }); | |
| 67 } | |
| 68 | |
| 69 PopupMenuController controller; | |
| 70 List<List<UINode>> items; | |
| 71 int level; | |
| 72 | |
| 73 void syncFields(PopupMenu source) { | |
| 74 controller = source.controller; | |
| 75 items = source.items; | |
| 76 level = source.level; | |
| 77 _painter = source._painter; | |
| 78 super.syncFields(source); | |
| 79 } | |
| 80 | |
| 81 double _position; | |
| 82 BoxPainter _painter; | |
| 83 | |
| 84 double _opacityFor(int i) { | |
| 85 if (_position == null || _position == 1.0) | |
| 86 return 1.0; | |
| 87 double unit = 1.0 / items.length; | |
| 88 double duration = 1.5 * unit; | |
| 89 double start = i * unit; | |
| 90 return math.max(0.0, math.min(1.0, (_position - start) / duration)); | |
| 91 } | |
| 92 | |
| 93 UINode build() { | |
| 94 int i = 0; | |
| 95 List<UINode> children = new List.from(items.map((List<UINode> item) { | |
| 96 double opacity = _opacityFor(i); | |
| 97 return new PopupMenuItem(key: i++, children: item, opacity: opacity); | |
| 98 })); | |
| 99 | |
| 100 return new Opacity( | |
| 101 opacity: math.min(1.0, _position * 3.0), | |
| 102 child: new ShrinkWrapWidth( | |
| 103 child: new CustomPaint( | |
| 104 callback: (sky.Canvas canvas, Size size) { | |
| 105 double width = math.min(size.width, size.width * (0.5 + _position *
2.0)); | |
| 106 double height = math.min(size.height, size.height * _position * 1.5)
; | |
| 107 _painter.paint(canvas, new Rect.fromLTRB(size.width - width, 0.0, wi
dth, height)); | |
| 108 }, | |
| 109 child: new Container( | |
| 110 padding: const EdgeDims.all(8.0), | |
| 111 child: new Block(children) | |
| 112 ) | |
| 113 ) | |
| 114 ) | |
| 115 ); | |
| 116 } | |
| 117 | |
| 118 } | |
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