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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:sky' as sky; | |
6 import 'package:sky/framework/app.dart'; | |
7 import 'package:sky/framework/rendering/box.dart'; | |
8 import 'package:sky/framework/rendering/object.dart'; | |
9 import 'package:sky/framework/animation/animated_value.dart'; | |
10 import 'package:sky/framework/animation/curves.dart'; | |
11 | |
12 const double _kInitialSize = 0.0; | |
13 const double _kTargetSize = 100.0; | |
14 const double _kSplashDuration = 500.0; | |
15 const int _kInitialOpacity = 0x80; | |
16 | |
17 class InkSplash { | |
18 final InkWell inkWell; | |
19 final sky.Paint _paint = new sky.Paint(); | |
20 final sky.Point position; | |
21 AnimatedValue radius; | |
22 | |
23 InkSplash({ this.position, this.inkWell }) { | |
24 radius = new AnimatedValue(_kInitialSize, onChange: _handleRadiusChange); | |
25 radius.animateTo(_kTargetSize, _kSplashDuration, curve: easeOut); | |
26 } | |
27 | |
28 void _handleRadiusChange() { | |
29 if (radius.value == _kTargetSize) | |
30 inkWell._splashes.remove(this); | |
31 inkWell.markNeedsPaint(); | |
32 } | |
33 | |
34 void paint(RenderObjectDisplayList canvas) { | |
35 int opacity = (_kInitialOpacity * (1.0 - (radius.value / _kTargetSize))).flo
or(); | |
36 _paint.color = new sky.Color(opacity << 24); | |
37 canvas.drawCircle(position.x, position.y, radius.value, _paint); | |
38 } | |
39 } | |
40 | |
41 class InkWell extends RenderBox { | |
42 final List<InkSplash> _splashes = new List<InkSplash>(); | |
43 | |
44 void handleEvent(sky.Event event) { | |
45 switch (event.type) { | |
46 case 'pointerdown': | |
47 _splashes.add(new InkSplash(position: new sky.Point(event.x, event.y), | |
48 inkWell: this)); | |
49 break; | |
50 } | |
51 markNeedsPaint(); | |
52 } | |
53 | |
54 void performLayout() { | |
55 size = constraints.constrain(sky.Size.infinite); | |
56 } | |
57 | |
58 void paint(RenderObjectDisplayList canvas) { | |
59 canvas.drawRect(new sky.Rect.fromLTRB(0.0, 0.0, size.width, size.height), | |
60 new sky.Paint()..color = const sky.Color(0xFFCCCCCC)); | |
61 for (InkSplash splash in _splashes) | |
62 splash.paint(canvas); | |
63 } | |
64 } | |
65 | |
66 AppView app; | |
67 | |
68 void main() { | |
69 app = new AppView(new InkWell()); | |
70 } | |
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