| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // @dart = 2.6 |
| import 'dart:ui'; |
| |
| import 'package:test/test.dart'; |
| |
| void main() { |
| // The actual values for font measurements will vary by platform slightly. |
| const double epsillon = 0.0001; |
| |
| test('Should be able to build and layout a paragraph', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle()); |
| builder.addText('Hello'); |
| final Paragraph paragraph = builder.build(); |
| expect(paragraph, isNotNull); |
| |
| paragraph.layout(const ParagraphConstraints(width: 800.0)); |
| expect(paragraph.width, isNonZero); |
| expect(paragraph.height, isNonZero); |
| }); |
| |
| test('PushStyle should not segfault after build()', () { |
| final ParagraphBuilder paragraphBuilder = |
| ParagraphBuilder(ParagraphStyle()); |
| paragraphBuilder.build(); |
| paragraphBuilder.pushStyle(TextStyle()); |
| }); |
| |
| test('GetRectsForRange smoke test', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle()); |
| builder.addText('Hello'); |
| final Paragraph paragraph = builder.build(); |
| expect(paragraph, isNotNull); |
| |
| paragraph.layout(const ParagraphConstraints(width: 800.0)); |
| expect(paragraph.width, isNonZero); |
| expect(paragraph.height, isNonZero); |
| |
| final List<TextBox> boxes = paragraph.getBoxesForRange(0, 3); |
| expect(boxes.length, 1); |
| expect(boxes.first.left, 0); |
| expect(boxes.first.top, closeTo(0, epsillon)); |
| expect(boxes.first.right, closeTo(42, epsillon)); |
| expect(boxes.first.bottom, closeTo(14, epsillon)); |
| expect(boxes.first.direction, TextDirection.ltr); |
| }); |
| |
| test('LineMetrics smoke test', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle()); |
| builder.addText('Hello'); |
| final Paragraph paragraph = builder.build(); |
| expect(paragraph, isNotNull); |
| |
| paragraph.layout(const ParagraphConstraints(width: 800.0)); |
| expect(paragraph.width, isNonZero); |
| expect(paragraph.height, isNonZero); |
| |
| final List<LineMetrics> metrics = paragraph.computeLineMetrics(); |
| expect(metrics.length, 1); |
| expect(metrics.first.hardBreak, true); |
| expect(metrics.first.ascent, closeTo(11.200042724609375, epsillon)); |
| expect(metrics.first.descent, closeTo(2.799957275390625, epsillon)); |
| expect(metrics.first.unscaledAscent, closeTo(11.200042724609375, epsillon)); |
| expect(metrics.first.height, 14.0); |
| expect(metrics.first.width, 70.0); |
| expect(metrics.first.left, 0.0); |
| expect(metrics.first.baseline, closeTo(11.200042724609375, epsillon)); |
| expect(metrics.first.lineNumber, 0); |
| }); |
| } |