87 lines
3.4 KiB
Dart
87 lines
3.4 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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class TestBlockPainter extends RenderObjectPainter {
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void paint(PaintingContext context, Offset offset) { }
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}
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void main() {
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test('block intrinsics', () {
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RenderParagraph paragraph = new RenderParagraph(
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new TextSpan(
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style: new TextStyle(height: 1.0),
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text: 'Hello World'
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)
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);
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const BoxConstraints unconstrained = const BoxConstraints();
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double textWidth = paragraph.getMaxIntrinsicWidth(unconstrained);
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double oneLineTextHeight = paragraph.getMinIntrinsicHeight(unconstrained);
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final BoxConstraints constrained = new BoxConstraints(maxWidth: textWidth * 0.9);
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double wrappedTextWidth = paragraph.getMinIntrinsicWidth(unconstrained);
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double twoLinesTextHeight = paragraph.getMinIntrinsicHeight(constrained);
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// controls
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expect(wrappedTextWidth, lessThan(textWidth));
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expect(paragraph.getMinIntrinsicWidth(unconstrained), equals(wrappedTextWidth));
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expect(paragraph.getMaxIntrinsicWidth(constrained), equals(constrained.maxWidth));
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expect(oneLineTextHeight, lessThan(twoLinesTextHeight));
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expect(twoLinesTextHeight, lessThan(oneLineTextHeight * 3.0));
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expect(paragraph.getMaxIntrinsicHeight(unconstrained), equals(oneLineTextHeight));
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expect(paragraph.getMaxIntrinsicHeight(constrained), equals(twoLinesTextHeight));
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RenderBox testBlock = new RenderBlock(
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children: <RenderBox>[
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paragraph,
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]
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);
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expect(testBlock.getMinIntrinsicWidth(unconstrained), equals(wrappedTextWidth));
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expect(testBlock.getMinIntrinsicWidth(constrained), equals(wrappedTextWidth));
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expect(testBlock.getMaxIntrinsicWidth(unconstrained), equals(textWidth));
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expect(testBlock.getMaxIntrinsicWidth(constrained), equals(constrained.maxWidth));
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expect(testBlock.getMinIntrinsicHeight(unconstrained), equals(oneLineTextHeight));
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expect(testBlock.getMinIntrinsicHeight(constrained), equals(twoLinesTextHeight));
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expect(testBlock.getMaxIntrinsicHeight(unconstrained), equals(oneLineTextHeight));
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expect(testBlock.getMaxIntrinsicHeight(constrained), equals(twoLinesTextHeight));
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final BoxConstraints empty = new BoxConstraints.tight(Size.zero);
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expect(testBlock.getMinIntrinsicWidth(empty), equals(0.0));
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expect(testBlock.getMaxIntrinsicWidth(empty), equals(0.0));
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expect(testBlock.getMinIntrinsicHeight(empty), equals(0.0));
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expect(testBlock.getMaxIntrinsicHeight(empty), equals(0.0));
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});
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test('overlay painters can attach and detach', () {
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TestBlockPainter first = new TestBlockPainter();
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TestBlockPainter second = new TestBlockPainter();
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RenderBlockViewport block = new RenderBlockViewport(overlayPainter: first);
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// The first painter isn't attached because we haven't attached block.
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expect(first.renderObject, isNull);
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expect(second.renderObject, isNull);
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block.overlayPainter = second;
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expect(first.renderObject, isNull);
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expect(second.renderObject, isNull);
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layout(block);
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expect(first.renderObject, isNull);
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expect(second.renderObject, equals(block));
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block.overlayPainter = first;
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expect(first.renderObject, equals(block));
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expect(second.renderObject, isNull);
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});
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}
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