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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/render_box.dart'; |
| 8 import 'package:sky/framework/rendering/render_node.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(RenderNodeDisplayList canvas) { |
| 35 int opacity = (_kInitialOpacity * (1.0 - (radius.value / _kTargetSize))).flo
or(); |
| 36 _paint.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 handlePointer(sky.PointerEvent 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(new sky.Size.infinite()); |
| 56 } |
| 57 |
| 58 void paint(RenderNodeDisplayList canvas) { |
| 59 canvas.drawRect(new sky.Rect.fromLTRB(0.0, 0.0, size.width, size.height), |
| 60 new sky.Paint()..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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