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Side by Side Diff: sky/examples/stocks2/lib/stock_arrow.dart

Issue 1174023003: Remove one more use of mirrors: Components now have to explicitly sync their fields. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 5 years, 6 months ago
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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 'package:sky/framework/fn2.dart'; 5 import 'package:sky/framework/fn2.dart';
6 import 'package:vector_math/vector_math.dart'; 6 import 'package:vector_math/vector_math.dart';
7 import 'package:sky/framework/rendering/box.dart'; 7 import 'package:sky/framework/rendering/box.dart';
8 import 'package:sky/framework/rendering/object.dart'; 8 import 'package:sky/framework/rendering/object.dart';
9 import 'package:sky/framework/theme2/colors.dart' as colors; 9 import 'package:sky/framework/theme2/colors.dart' as colors;
10 10
11 import 'dart:math' as math; 11 import 'dart:math' as math;
12 import 'dart:sky' as sky; 12 import 'dart:sky' as sky;
13 13
14 class StockArrow extends Component { 14 class StockArrow extends Component {
15 double percentChange; 15 double percentChange;
16 16
17 StockArrow({ Object key, this.percentChange }) : super(key: key); 17 StockArrow({ Object key, this.percentChange }) : super(key: key);
18 18
19 void syncFields(StockArrow source) {
20 percentChange = source.percentChange;
21 super.syncFields(source);
22 }
23
19 int _colorIndexForPercentChange(double percentChange) { 24 int _colorIndexForPercentChange(double percentChange) {
20 double maxPercent = 10.0; 25 double maxPercent = 10.0;
21 double normalizedPercentChange = math.min(percentChange.abs(), maxPercent) / maxPercent; 26 double normalizedPercentChange = math.min(percentChange.abs(), maxPercent) / maxPercent;
22 return 100 + (normalizedPercentChange * 8.0).floor() * 100; 27 return 100 + (normalizedPercentChange * 8.0).floor() * 100;
23 } 28 }
24 29
25 Color _colorForPercentChange(double percentChange) { 30 Color _colorForPercentChange(double percentChange) {
26 if (percentChange > 0) 31 if (percentChange > 0)
27 return colors.Green[_colorIndexForPercentChange(percentChange)]; 32 return colors.Green[_colorIndexForPercentChange(percentChange)];
28 return colors.Red[_colorIndexForPercentChange(percentChange)]; 33 return colors.Red[_colorIndexForPercentChange(percentChange)];
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65 canvas.restore(); 70 canvas.restore();
66 }); 71 });
67 72
68 return new Container( 73 return new Container(
69 child: arrow, 74 child: arrow,
70 width: size, 75 width: size,
71 height: size, 76 height: size,
72 margin: const EdgeDims.symmetric(horizontal: 5.0)); 77 margin: const EdgeDims.symmetric(horizontal: 5.0));
73 } 78 }
74 } 79 }
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