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3fe1c0b38c
Previously, we were not adjusting the minimum width, so we ended up offsetting the child but not shrinking it, when the parent expected the child to be exactly fit to its dimensions. R=abarth@chromium.org Review URL: https://codereview.chromium.org/1155303005
77 lines
2.7 KiB
Dart
77 lines
2.7 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:sky' as sky;
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import 'box.dart';
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import 'node.dart';
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class BlockParentData extends BoxParentData with ContainerParentDataMixin<RenderBox> { }
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class RenderBlock extends RenderBox with ContainerRenderNodeMixin<RenderBox, BlockParentData>,
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RenderBoxContainerDefaultsMixin<RenderBox, BlockParentData> {
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// lays out RenderBox children in a vertical stack
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// uses the maximum width provided by the parent
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// sizes itself to the height of its child stack
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RenderBlock({
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List<RenderBox> children
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}) {
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if (children != null)
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children.forEach((child) { add(child); });
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}
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void setParentData(RenderBox child) {
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if (child.parentData is! BlockParentData)
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child.parentData = new BlockParentData();
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}
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// override this to report what dimensions you would have if you
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// were laid out with the given constraints this can walk the tree
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// if it must, but it should be as cheap as possible; just get the
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// dimensions and nothing else (e.g. don't calculate hypothetical
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// child positions if they're not needed to determine dimensions)
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sky.Size getIntrinsicDimensions(BoxConstraints constraints) {
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double height = 0.0;
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double width = constraints.constrainWidth(constraints.maxWidth);
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assert(width < double.INFINITY);
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RenderBox child = firstChild;
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BoxConstraints innerConstraints = new BoxConstraints(minWidth: width,
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maxWidth: width);
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while (child != null) {
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height += child.getIntrinsicDimensions(innerConstraints).height;
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assert(child.parentData is BlockParentData);
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child = child.parentData.nextSibling;
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}
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return new sky.Size(width, constraints.constrainHeight(height));
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}
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void performLayout() {
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assert(constraints is BoxConstraints);
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double width = constraints.constrainWidth(constraints.maxWidth);
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double y = 0.0;
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RenderBox child = firstChild;
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while (child != null) {
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child.layout(new BoxConstraints(minWidth: width, maxWidth: width), parentUsesSize: true);
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assert(child.parentData is BlockParentData);
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child.parentData.position = new sky.Point(0.0, y);
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y += child.size.height;
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child = child.parentData.nextSibling;
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}
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size = new sky.Size(width, constraints.constrainHeight(y));
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assert(size.width < double.INFINITY);
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assert(size.height < double.INFINITY);
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}
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void hitTestChildren(HitTestResult result, { sky.Point position }) {
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defaultHitTestChildren(result, position: position);
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}
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void paint(RenderNodeDisplayList canvas) {
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defaultPaint(canvas);
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}
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}
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