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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 /** | 5 /** |
6 * Implements a grid-based layout system based on: | 6 * Implements a grid-based layout system based on: |
7 * [http://dev.w3.org/csswg/css3-grid-align/] | 7 * [http://dev.w3.org/csswg/css3-grid-align/] |
8 * | 8 * |
9 * This layout is designed to support animations and work on browsers that | 9 * This layout is designed to support animations and work on browsers that |
10 * don't support grid natively. As such, we implement it on top of absolute | 10 * don't support grid natively. As such, we implement it on top of absolute |
11 * positioning. | 11 * positioning. |
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87 | 87 |
88 | 88 |
89 int get currentWidth() => _gridWidth; | 89 int get currentWidth() => _gridWidth; |
90 int get currentHeight() => _gridHeight; | 90 int get currentHeight() => _gridHeight; |
91 | 91 |
92 void cacheExistingBrowserLayout() { | 92 void cacheExistingBrowserLayout() { |
93 // We don't need to do anything as we don't rely on the _cachedViewRect | 93 // We don't need to do anything as we don't rely on the _cachedViewRect |
94 // when the grid layout is used. | 94 // when the grid layout is used. |
95 } | 95 } |
96 | 96 |
| 97 // TODO(jacobr): cleanup this method so that it returns a Future |
| 98 // rather than taking a Completer as an argument. |
97 /** The main entry point for layout computation. */ | 99 /** The main entry point for layout computation. */ |
98 bool measureLayout(int width, int height) { | 100 void measureLayout(Future<Size> size, Completer<bool> changed) { |
99 assert(window.inMeasurementFrame); | |
100 _ensureAllTracks(); | 101 _ensureAllTracks(); |
101 _gridWidth = width; | 102 window.requestLayoutFrame(() { |
102 _gridHeight = height; | 103 _gridWidth = size.value.width; |
| 104 _gridHeight = size.value.height; |
103 | 105 |
104 if (_rowTracks.length > 0 && _columnTracks.length > 0) { | 106 if (_rowTracks.length > 0 && _columnTracks.length > 0) { |
105 _measureTracks(); | 107 _measureTracks(); |
106 _setBoundsOfChildren(); | 108 _setBoundsOfChildren(); |
107 return true; | 109 if (changed != null) { |
108 } | 110 changed.complete(true); |
109 return false; | 111 } |
| 112 } |
| 113 }); |
110 } | 114 } |
111 | 115 |
112 /** | 116 /** |
113 * The top level measurement function. | 117 * The top level measurement function. |
114 * [http://dev.w3.org/csswg/css3-grid-align/#calculating-size-of-grid-tracks] | 118 * [http://dev.w3.org/csswg/css3-grid-align/#calculating-size-of-grid-tracks] |
115 */ | 119 */ |
116 void _measureTracks() { | 120 void _measureTracks() { |
117 // Resolve logical width, then height. Width comes first so we can use | 121 // Resolve logical width, then height. Width comes first so we can use |
118 // the width when determining the content-sized height. | 122 // the width when determining the content-sized height. |
119 try { | 123 try { |
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507 } | 511 } |
508 return result; | 512 return result; |
509 } | 513 } |
510 | 514 |
511 int _getSpanCount(ViewLayout item) { | 515 int _getSpanCount(ViewLayout item) { |
512 GridLayoutParams childLayout = item.layoutParams; | 516 GridLayoutParams childLayout = item.layoutParams; |
513 return (_dimension == Dimension.WIDTH ? | 517 return (_dimension == Dimension.WIDTH ? |
514 childLayout.columnSpan : childLayout.rowSpan); | 518 childLayout.columnSpan : childLayout.rowSpan); |
515 } | 519 } |
516 } | 520 } |
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