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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 '../animation/scroll_behavior.dart'; | 5 import '../animation/scroll_behavior.dart'; |
6 import '../debug/tracing.dart'; | 6 import '../debug/tracing.dart'; |
7 import '../fn.dart'; | 7 import '../fn.dart'; |
8 import 'dart:math' as math; | 8 import 'dart:math' as math; |
9 import 'dart:sky' as sky; | 9 import 'dart:sky' as sky; |
10 import 'dart:async'; | 10 import 'dart:async'; |
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45 assert(scrollRect.height > 0); | 45 assert(scrollRect.height > 0); |
46 assert(itemRect.height > 0); | 46 assert(itemRect.height > 0); |
47 | 47 |
48 setState(() { | 48 setState(() { |
49 _height = scrollRect.height; | 49 _height = scrollRect.height; |
50 _itemHeight = itemRect.height; | 50 _itemHeight = itemRect.height; |
51 }); | 51 }); |
52 }); | 52 }); |
53 } | 53 } |
54 | 54 |
55 Node buildContent() { | 55 UINode buildContent() { |
56 var itemNumber = 0; | 56 var itemNumber = 0; |
57 var drawCount = 1; | 57 var drawCount = 1; |
58 var transformStyle = ''; | 58 var transformStyle = ''; |
59 | 59 |
60 if (_itemHeight == null) | 60 if (_itemHeight == null) |
61 new Future.microtask(_measureHeights); | 61 new Future.microtask(_measureHeights); |
62 | 62 |
63 if (_height > 0.0 && _itemHeight != null) { | 63 if (_height > 0.0 && _itemHeight != null) { |
64 if (scrollOffset < 0.0) { | 64 if (scrollOffset < 0.0) { |
65 double visibleHeight = _height + scrollOffset; | 65 double visibleHeight = _height + scrollOffset; |
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86 children: [ | 86 children: [ |
87 new Container( | 87 new Container( |
88 style: _scrollAreaStyle, | 88 style: _scrollAreaStyle, |
89 inlineStyle: transformStyle, | 89 inlineStyle: transformStyle, |
90 children: buildItems(itemNumber, drawCount) | 90 children: buildItems(itemNumber, drawCount) |
91 ) | 91 ) |
92 ] | 92 ] |
93 ); | 93 ); |
94 } | 94 } |
95 } | 95 } |
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