83 lines
1.9 KiB
Dart
83 lines
1.9 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 'package:flutter/rendering.dart';
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import 'package:test/test.dart';
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import 'rendering_tester.dart';
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class RenderFixedSize extends RenderBox {
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double dimension = 100.0;
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void grow() {
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dimension *= 2.0;
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markNeedsLayout();
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}
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@override double computeMinIntrinsicWidth(double height) => dimension;
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@override double computeMaxIntrinsicWidth(double height) => dimension;
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@override double computeMinIntrinsicHeight(double width) => dimension;
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@override double computeMaxIntrinsicHeight(double width) => dimension;
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@override
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void performLayout() {
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size = new Size.square(dimension);
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}
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}
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class RenderParentSize extends RenderProxyBox {
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RenderParentSize({ RenderBox child }) : super(child);
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@override
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bool get sizedByParent => true;
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@override
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void performResize() {
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size = constraints.biggest;
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}
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@override
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void performLayout() {
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child.layout(constraints);
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}
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}
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class RenderIntrinsicSize extends RenderProxyBox {
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RenderIntrinsicSize({ RenderBox child }) : super(child);
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@override
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void performLayout() {
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child.layout(constraints);
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size = new Size(
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child.getMinIntrinsicWidth(double.INFINITY),
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child.getMinIntrinsicHeight(double.INFINITY)
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);
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}
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}
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void main() {
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test('Whether using intrinsics means you get hooked into layout', () {
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RenderBox root;
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RenderFixedSize inner;
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layout(
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root = new RenderIntrinsicSize(
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child: new RenderParentSize(
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child: inner = new RenderFixedSize()
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)
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),
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constraints: new BoxConstraints(
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minWidth: 0.0,
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minHeight: 0.0,
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maxWidth: 1000.0,
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maxHeight: 1000.0
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)
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);
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expect(root.size, equals(inner.size));
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inner.grow();
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pumpFrame();
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expect(root.size, equals(inner.size));
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});
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}
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