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055c919fda
Turns out a common use for Baseline is making sure that the child's baseline is higher than it otherwise would be, e.g. with the Material font or other symbols.
55 lines
1.9 KiB
Dart
55 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/material.dart';
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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("RenderBaseline", () {
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RenderBaseline parent;
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RenderSizedBox child;
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RenderBox root = new RenderPositionedBox(
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alignment: FractionalOffset.topLeft,
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child: parent = new RenderBaseline(
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baseline: 0.0,
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baselineType: TextBaseline.alphabetic,
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child: child = new RenderSizedBox(new Size(100.0, 100.0))
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)
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);
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BoxParentData childParentData = child.parentData;
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layout(root, phase: EnginePhase.layout);
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expect(childParentData.offset.dx, equals(0.0));
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expect(childParentData.offset.dy, equals(-100.0));
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expect(parent.size, equals(new Size(100.0, 0.0)));
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parent.baseline = 25.0;
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layout(root, phase: EnginePhase.layout);
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expect(childParentData.offset.dx, equals(0.0));
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expect(childParentData.offset.dy, equals(-75.0));
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expect(parent.size, equals(new Size(100.0, 25.0)));
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parent.baseline = 90.0;
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layout(root, phase: EnginePhase.layout);
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expect(childParentData.offset.dx, equals(0.0));
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expect(childParentData.offset.dy, equals(-10.0));
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expect(parent.size, equals(new Size(100.0, 90.0)));
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parent.baseline = 100.0;
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layout(root, phase: EnginePhase.layout);
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expect(childParentData.offset.dx, equals(0.0));
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expect(childParentData.offset.dy, equals(0.0));
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expect(parent.size, equals(new Size(100.0, 100.0)));
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parent.baseline = 110.0;
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layout(root, phase: EnginePhase.layout);
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expect(childParentData.offset.dx, equals(0.0));
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expect(childParentData.offset.dy, equals(10.0));
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expect(parent.size, equals(new Size(100.0, 110.0)));
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});
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}
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