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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 'box.dart'; | |
| 6 import 'dart:math' as math; | |
| 7 import 'object.dart'; | |
| 8 | |
| 9 class BlockParentData extends BoxParentData with ContainerParentDataMixin<Render
Box> { } | |
| 10 | |
| 11 class RenderBlock extends RenderBox with ContainerRenderObjectMixin<RenderBox, B
lockParentData>, | |
| 12 RenderBoxContainerDefaultsMixin<RenderB
ox, BlockParentData> { | |
| 13 // lays out RenderBox children in a vertical stack | |
| 14 // uses the maximum width provided by the parent | |
| 15 // sizes itself to the height of its child stack | |
| 16 | |
| 17 RenderBlock({ | |
| 18 List<RenderBox> children | |
| 19 }) { | |
| 20 if (children != null) | |
| 21 children.forEach((child) { add(child); }); | |
| 22 } | |
| 23 | |
| 24 void setParentData(RenderBox child) { | |
| 25 if (child.parentData is! BlockParentData) | |
| 26 child.parentData = new BlockParentData(); | |
| 27 } | |
| 28 | |
| 29 double getMinIntrinsicWidth(BoxConstraints constraints) { | |
| 30 double width = 0.0; | |
| 31 BoxConstraints innerConstraints = new BoxConstraints( | |
| 32 minWidth: constraints.minWidth, maxWidth: constraints.maxWidth); | |
| 33 RenderBox child = firstChild; | |
| 34 while (child != null) { | |
| 35 width = math.max(width, child.getMinIntrinsicWidth(innerConstraints)); | |
| 36 child = child.parentData.nextSibling; | |
| 37 } | |
| 38 return width; | |
| 39 } | |
| 40 | |
| 41 double getMaxIntrinsicWidth(BoxConstraints constraints) { | |
| 42 double width = 0.0; | |
| 43 BoxConstraints innerConstraints = new BoxConstraints( | |
| 44 minWidth: constraints.minWidth, maxWidth: constraints.maxWidth); | |
| 45 RenderBox child = firstChild; | |
| 46 while (child != null) { | |
| 47 width = math.max(width, child.getMaxIntrinsicWidth(innerConstraints)); | |
| 48 child = child.parentData.nextSibling; | |
| 49 } | |
| 50 return width; | |
| 51 } | |
| 52 | |
| 53 BoxConstraints _getInnerConstraintsForWidth(double width) { | |
| 54 return new BoxConstraints(minWidth: width, maxWidth: width); | |
| 55 } | |
| 56 | |
| 57 double _getIntrinsicHeight(BoxConstraints constraints) { | |
| 58 double height = 0.0; | |
| 59 double width = constraints.constrainWidth(constraints.maxWidth); | |
| 60 BoxConstraints innerConstraints = _getInnerConstraintsForWidth(width); | |
| 61 RenderBox child = firstChild; | |
| 62 while (child != null) { | |
| 63 double childHeight = child.getMinIntrinsicHeight(innerConstraints); | |
| 64 assert(childHeight == child.getMaxIntrinsicHeight(innerConstraints)); | |
| 65 height += childHeight; | |
| 66 child = child.parentData.nextSibling; | |
| 67 } | |
| 68 return height; | |
| 69 } | |
| 70 | |
| 71 double getMinIntrinsicHeight(BoxConstraints constraints) { | |
| 72 return _getIntrinsicHeight(constraints); | |
| 73 } | |
| 74 | |
| 75 double getMaxIntrinsicHeight(BoxConstraints constraints) { | |
| 76 return _getIntrinsicHeight(constraints); | |
| 77 } | |
| 78 | |
| 79 void performLayout() { | |
| 80 assert(constraints is BoxConstraints); | |
| 81 double width = constraints.constrainWidth(constraints.maxWidth); | |
| 82 BoxConstraints innerConstraints = _getInnerConstraintsForWidth(width); | |
| 83 double y = 0.0; | |
| 84 RenderBox child = firstChild; | |
| 85 while (child != null) { | |
| 86 child.layout(innerConstraints, parentUsesSize: true); | |
| 87 assert(child.parentData is BlockParentData); | |
| 88 child.parentData.position = new Point(0.0, y); | |
| 89 y += child.size.height; | |
| 90 child = child.parentData.nextSibling; | |
| 91 } | |
| 92 size = new Size(width, constraints.constrainHeight(y)); | |
| 93 assert(size.width < double.INFINITY); | |
| 94 assert(size.height < double.INFINITY); | |
| 95 } | |
| 96 | |
| 97 void hitTestChildren(HitTestResult result, { Point position }) { | |
| 98 defaultHitTestChildren(result, position: position); | |
| 99 } | |
| 100 | |
| 101 void paint(RenderObjectDisplayList canvas) { | |
| 102 defaultPaint(canvas); | |
| 103 } | |
| 104 | |
| 105 } | |
| 106 | |
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