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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:math' as math; | |
| 6 import 'dart:sky' as sky; | |
| 7 | |
| 8 import '../animation/animated_value.dart'; | |
| 9 import '../animation/curves.dart'; | |
| 10 import '../rendering/box.dart'; | |
| 11 import '../rendering/object.dart'; | |
| 12 import 'ui_node.dart'; | |
| 13 import 'basic.dart'; | |
| 14 | |
| 15 const int _kSplashInitialOpacity = 0x80; | |
| 16 const double _kSplashInitialDelay = 0.0; // we could delay initially in case the
user scrolls | |
| 17 const double _kSplashInitialSize = 0.0; | |
| 18 const double _kSplashConfirmedVelocity = 0.3; | |
| 19 const double _kSplashUnconfirmedVelocity = 0.1; | |
| 20 | |
| 21 double _getSplashTargetSize(Size bounds, Point position) { | |
| 22 return math.max(math.max(position.x, bounds.width - position.x), | |
| 23 math.max(position.y, bounds.height - position.y)); | |
| 24 } | |
| 25 | |
| 26 class InkSplash { | |
| 27 InkSplash(this.pointer, this.position, this.well) { | |
| 28 _targetRadius = _getSplashTargetSize(well.size, position); | |
| 29 double duration = _targetRadius / _kSplashUnconfirmedVelocity; | |
| 30 _radius = new AnimatedValue(_kSplashInitialSize, onChange: _handleRadiusChan
ge); | |
| 31 _radius.animateTo(_targetRadius, duration, curve: easeOut, | |
| 32 initialDelay: _kSplashInitialDelay); | |
| 33 } | |
| 34 | |
| 35 final int pointer; | |
| 36 final Point position; | |
| 37 final RenderInkWell well; | |
| 38 | |
| 39 double _targetRadius; | |
| 40 AnimatedValue _radius; | |
| 41 | |
| 42 void confirm() { | |
| 43 double duration = (_targetRadius - _radius.value) / _kSplashConfirmedVelocit
y; | |
| 44 if (duration <= 0.0) | |
| 45 return; | |
| 46 _radius.animateTo(_targetRadius, duration, curve: easeOut); | |
| 47 } | |
| 48 | |
| 49 void _handleRadiusChange() { | |
| 50 if (_radius.value == _targetRadius) | |
| 51 well._splashes.remove(this); | |
| 52 well.markNeedsPaint(); | |
| 53 } | |
| 54 | |
| 55 void paint(RenderObjectDisplayList canvas) { | |
| 56 int opacity = (_kSplashInitialOpacity * (1.0 - (_radius.value / _targetRadiu
s))).floor(); | |
| 57 sky.Paint paint = new sky.Paint()..color = new sky.Color(opacity << 24); | |
| 58 canvas.drawCircle(position.x, position.y, _radius.value, paint); | |
| 59 } | |
| 60 } | |
| 61 | |
| 62 class RenderInkWell extends RenderProxyBox { | |
| 63 RenderInkWell({ RenderBox child }) : super(child); | |
| 64 | |
| 65 final List<InkSplash> _splashes = new List<InkSplash>(); | |
| 66 | |
| 67 void handleEvent(sky.Event event, BoxHitTestEntry entry) { | |
| 68 switch (event.type) { | |
| 69 case 'gesturetapdown': | |
| 70 // TODO(abarth): We should position the splash at the location of the ta
p. | |
| 71 _startSplash(event.primaryPointer, entry.localPosition); | |
| 72 break; | |
| 73 case 'gesturetap': | |
| 74 _confirmSplash(event.primaryPointer); | |
| 75 break; | |
| 76 } | |
| 77 } | |
| 78 | |
| 79 void _startSplash(int pointer, Point position) { | |
| 80 _splashes.add(new InkSplash(pointer, position, this)); | |
| 81 markNeedsPaint(); | |
| 82 } | |
| 83 | |
| 84 void _confirmSplash(int pointer) { | |
| 85 _splashes.where((splash) => splash.pointer == pointer) | |
| 86 .forEach((splash) { splash.confirm(); }); | |
| 87 markNeedsPaint(); | |
| 88 } | |
| 89 | |
| 90 void paint(RenderObjectDisplayList canvas) { | |
| 91 if (!_splashes.isEmpty) { | |
| 92 canvas.save(); | |
| 93 canvas.clipRect(new Rect.fromSize(size)); | |
| 94 for (InkSplash splash in _splashes) | |
| 95 splash.paint(canvas); | |
| 96 canvas.restore(); | |
| 97 } | |
| 98 super.paint(canvas); | |
| 99 } | |
| 100 } | |
| 101 | |
| 102 class InkWell extends OneChildRenderObjectWrapper { | |
| 103 InkWell({ UINode child, Object key }) | |
| 104 : super(child: child, key: key); | |
| 105 | |
| 106 RenderInkWell get root { RenderInkWell result = super.root; return result; } | |
| 107 | |
| 108 RenderInkWell createNode() => new RenderInkWell(); | |
| 109 } | |
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