46a178dce6
This patch make grid layout much more flexible. The behavior is factored out into a GridDelegate that's modeled after the custom layout delegates. The patch includes a MaxTileWidthGridDelegate that implements the old behavior and a FixedColumnCountGridDelegate that implements a grid layout with a fixed number of columns. Fixes #1048
48 lines
1.6 KiB
Dart
48 lines
1.6 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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void main() {
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test('Basic grid layout test', () {
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List<RenderBox> children = <RenderBox>[
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new RenderDecoratedBox(decoration: new BoxDecoration()),
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new RenderDecoratedBox(decoration: new BoxDecoration()),
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new RenderDecoratedBox(decoration: new BoxDecoration()),
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new RenderDecoratedBox(decoration: new BoxDecoration())
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];
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RenderGrid grid = new RenderGrid(
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children: children,
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delegate: new MaxTileWidthGridDelegate(maxTileWidth: 100.0)
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);
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layout(grid, constraints: const BoxConstraints(maxWidth: 200.0));
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children.forEach((RenderBox child) {
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expect(child.size.width, equals(100.0), reason: "child width");
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expect(child.size.height, equals(100.0), reason: "child height");
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});
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expect(grid.size.width, equals(200.0), reason: "grid width");
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expect(grid.size.height, equals(200.0), reason: "grid height");
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expect(grid.needsLayout, equals(false));
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grid.delegate = new MaxTileWidthGridDelegate(maxTileWidth: 60.0);
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expect(grid.needsLayout, equals(true));
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pumpFrame();
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children.forEach((RenderBox child) {
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expect(child.size.width, equals(50.0), reason: "child width");
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expect(child.size.height, equals(50.0), reason: "child height");
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});
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expect(grid.size.width, equals(200.0), reason: "grid width");
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expect(grid.size.height, equals(50.0), reason: "grid height");
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});
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}
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