| // 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 'package:ui/src/engine.dart'; |
| import 'package:ui/ui.dart' hide window; |
| |
| import 'package:test/test.dart'; |
| |
| void testEachMeasurement(String description, VoidCallback body, {bool skip}) { |
| test('$description (dom measurement)', () async { |
| try { |
| TextMeasurementService.initialize(rulerCacheCapacity: 2); |
| WebExperiments.instance.useCanvasText = false; |
| return body(); |
| } finally { |
| WebExperiments.instance.useCanvasText = null; |
| TextMeasurementService.clearCache(); |
| } |
| }, skip: skip); |
| test('$description (canvas measurement)', () async { |
| try { |
| TextMeasurementService.initialize(rulerCacheCapacity: 2); |
| WebExperiments.instance.useCanvasText = true; |
| return body(); |
| } finally { |
| WebExperiments.instance.useCanvasText = null; |
| TextMeasurementService.clearCache(); |
| } |
| }, skip: skip); |
| } |
| |
| void main() async { |
| await webOnlyInitializeTestDomRenderer(); |
| |
| // Ahem font uses a constant ideographic/alphabetic baseline ratio. |
| const double kAhemBaselineRatio = 1.25; |
| |
| testEachMeasurement('predictably lays out a single-line paragraph', () { |
| for (double fontSize in <double>[10.0, 20.0, 30.0, 40.0]) { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: fontSize, |
| )); |
| builder.addText('Test'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 400.0)); |
| |
| expect(paragraph.height, closeTo(fontSize, 0.001)); |
| expect(paragraph.width, closeTo(400.0, 0.001)); |
| expect(paragraph.minIntrinsicWidth, closeTo(fontSize * 4.0, 0.001)); |
| expect(paragraph.maxIntrinsicWidth, closeTo(fontSize * 4.0, 0.001)); |
| expect(paragraph.alphabeticBaseline, closeTo(fontSize * .8, 0.001)); |
| expect( |
| paragraph.ideographicBaseline, |
| closeTo(paragraph.alphabeticBaseline * kAhemBaselineRatio, 3.0), |
| ); |
| } |
| }); |
| |
| testEachMeasurement('predictably lays out a multi-line paragraph', () { |
| for (double fontSize in <double>[10.0, 20.0, 30.0, 40.0]) { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: fontSize, |
| )); |
| builder.addText('Test Ahem'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(ParagraphConstraints(width: fontSize * 5.0)); |
| |
| expect( |
| paragraph.height, closeTo(fontSize * 2.0, 0.001)); // because it wraps |
| expect(paragraph.width, closeTo(fontSize * 5.0, 0.001)); |
| expect(paragraph.minIntrinsicWidth, closeTo(fontSize * 4.0, 0.001)); |
| |
| // TODO(yjbanov): see https://github.com/flutter/flutter/issues/21965 |
| expect(paragraph.maxIntrinsicWidth, closeTo(fontSize * 9.0, 0.001)); |
| expect(paragraph.alphabeticBaseline, closeTo(fontSize * .8, 0.001)); |
| expect( |
| paragraph.ideographicBaseline, |
| closeTo(paragraph.alphabeticBaseline * kAhemBaselineRatio, 3.0), |
| ); |
| } |
| }); |
| |
| testEachMeasurement('predictably lays out a single-line rich paragraph', () { |
| for (double fontSize in <double>[10.0, 20.0, 30.0, 40.0]) { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: fontSize, |
| )); |
| builder.addText('span1'); |
| builder.pushStyle(TextStyle(fontWeight: FontWeight.bold)); |
| builder.addText('span2'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(ParagraphConstraints(width: fontSize * 10.0)); |
| |
| expect(paragraph.height, fontSize); |
| expect(paragraph.width, fontSize * 10.0); |
| expect(paragraph.minIntrinsicWidth, fontSize * 10.0); |
| expect(paragraph.maxIntrinsicWidth, fontSize * 10.0); |
| } |
| }, |
| // TODO(nurhan): https://github.com/flutter/flutter/issues/50771 |
| // TODO(nurhan): https://github.com/flutter/flutter/issues/46638 |
| // TODO(nurhan): https://github.com/flutter/flutter/issues/50590 |
| skip: (browserEngine != BrowserEngine.blink)); |
| |
| testEachMeasurement('predictably lays out a multi-line rich paragraph', () { |
| for (double fontSize in <double>[10.0, 20.0, 30.0, 40.0]) { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: fontSize, |
| )); |
| builder.addText('12345 '); |
| builder.addText('67890 '); |
| builder.pushStyle(TextStyle(fontWeight: FontWeight.bold)); |
| builder.addText('bold'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(ParagraphConstraints(width: fontSize * 5.0)); |
| |
| expect(paragraph.height, fontSize * 3.0); // because it wraps |
| expect(paragraph.width, fontSize * 5.0); |
| expect(paragraph.minIntrinsicWidth, fontSize * 5.0); |
| expect(paragraph.maxIntrinsicWidth, fontSize * 16.0); |
| } |
| }, |
| // TODO(nurhan): https://github.com/flutter/flutter/issues/46638 |
| // TODO(nurhan): https://github.com/flutter/flutter/issues/50590 |
| // TODO(nurhan): https://github.com/flutter/flutter/issues/50771 |
| skip: (browserEngine != BrowserEngine.blink)); |
| |
| testEachMeasurement('getPositionForOffset single-line', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| textDirection: TextDirection.ltr, |
| )); |
| builder.addText('abcd efg'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 1000)); |
| |
| // At the beginning of the line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, 5)), |
| TextPosition(offset: 0, affinity: TextAffinity.downstream), |
| ); |
| // Below the line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, 12)), |
| TextPosition(offset: 8, affinity: TextAffinity.upstream), |
| ); |
| // Above the line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, -5)), |
| TextPosition(offset: 0, affinity: TextAffinity.downstream), |
| ); |
| // At the end of the line. |
| expect( |
| paragraph.getPositionForOffset(Offset(80, 5)), |
| TextPosition(offset: 8, affinity: TextAffinity.upstream), |
| ); |
| // On the left side of "b". |
| expect( |
| paragraph.getPositionForOffset(Offset(14, 5)), |
| TextPosition(offset: 1, affinity: TextAffinity.downstream), |
| ); |
| // On the right side of "b". |
| expect( |
| paragraph.getPositionForOffset(Offset(16, 5)), |
| TextPosition(offset: 2, affinity: TextAffinity.upstream), |
| ); |
| }); |
| |
| test('getPositionForOffset multi-line', () { |
| // [Paragraph.getPositionForOffset] for multi-line text doesn't work well |
| // with dom-based measurement. |
| WebExperiments.instance.useCanvasText = true; |
| TextMeasurementService.initialize(rulerCacheCapacity: 2); |
| |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| textDirection: TextDirection.ltr, |
| )); |
| builder.addText('abcd\n'); |
| builder.addText('abcdefg\n'); |
| builder.addText('ab'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 100)); |
| |
| // First line: "abcd\n" |
| |
| // At the beginning of the first line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, 5)), |
| TextPosition(offset: 0, affinity: TextAffinity.downstream), |
| ); |
| // Above the first line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, -15)), |
| TextPosition(offset: 0, affinity: TextAffinity.downstream), |
| ); |
| // At the end of the first line. |
| expect( |
| paragraph.getPositionForOffset(Offset(50, 5)), |
| TextPosition(offset: 4, affinity: TextAffinity.upstream), |
| ); |
| // On the left side of "b" in the first line. |
| expect( |
| paragraph.getPositionForOffset(Offset(14, 5)), |
| TextPosition(offset: 1, affinity: TextAffinity.downstream), |
| ); |
| // On the right side of "b" in the first line. |
| expect( |
| paragraph.getPositionForOffset(Offset(16, 5)), |
| TextPosition(offset: 2, affinity: TextAffinity.upstream), |
| ); |
| |
| // Second line: "abcdefg\n" |
| |
| // At the beginning of the second line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, 15)), |
| TextPosition(offset: 5, affinity: TextAffinity.downstream), |
| ); |
| // At the end of the second line. |
| expect( |
| paragraph.getPositionForOffset(Offset(100, 15)), |
| TextPosition(offset: 12, affinity: TextAffinity.upstream), |
| ); |
| // On the left side of "e" in the second line. |
| expect( |
| paragraph.getPositionForOffset(Offset(44, 15)), |
| TextPosition(offset: 9, affinity: TextAffinity.downstream), |
| ); |
| // On the right side of "e" in the second line. |
| expect( |
| paragraph.getPositionForOffset(Offset(46, 15)), |
| TextPosition(offset: 10, affinity: TextAffinity.upstream), |
| ); |
| |
| // Last (third) line: "ab" |
| |
| // At the beginning of the last line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, 25)), |
| TextPosition(offset: 13, affinity: TextAffinity.downstream), |
| ); |
| // At the end of the last line. |
| expect( |
| paragraph.getPositionForOffset(Offset(100, 25)), |
| TextPosition(offset: 15, affinity: TextAffinity.upstream), |
| ); |
| // Below the last line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, 32)), |
| TextPosition(offset: 15, affinity: TextAffinity.upstream), |
| ); |
| // On the left side of "b" in the last line. |
| expect( |
| paragraph.getPositionForOffset(Offset(12, 25)), |
| TextPosition(offset: 14, affinity: TextAffinity.downstream), |
| ); |
| // On the right side of "a" in the last line. |
| expect( |
| paragraph.getPositionForOffset(Offset(9, 25)), |
| TextPosition(offset: 14, affinity: TextAffinity.upstream), |
| ); |
| |
| TextMeasurementService.clearCache(); |
| WebExperiments.instance.useCanvasText = null; |
| }); |
| |
| test('getPositionForOffset multi-line centered', () { |
| WebExperiments.instance.useCanvasText = true; |
| TextMeasurementService.initialize(rulerCacheCapacity: 2); |
| |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| textDirection: TextDirection.ltr, |
| textAlign: TextAlign.center, |
| )); |
| builder.addText('abcd\n'); |
| builder.addText('abcdefg\n'); |
| builder.addText('ab'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 100)); |
| |
| // First line: "abcd\n" |
| |
| // At the beginning of the first line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, 5)), |
| TextPosition(offset: 0, affinity: TextAffinity.downstream), |
| ); |
| // Above the first line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, -15)), |
| TextPosition(offset: 0, affinity: TextAffinity.downstream), |
| ); |
| // At the end of the first line. |
| expect( |
| paragraph.getPositionForOffset(Offset(100, 5)), |
| TextPosition(offset: 4, affinity: TextAffinity.upstream), |
| ); |
| // On the left side of "b" in the first line. |
| expect( |
| // The line is centered so it's shifted to the right by "30.0px". |
| paragraph.getPositionForOffset(Offset(30.0 + 14, 5)), |
| TextPosition(offset: 1, affinity: TextAffinity.downstream), |
| ); |
| // On the right side of "b" in the first line. |
| expect( |
| // The line is centered so it's shifted to the right by "30.0px". |
| paragraph.getPositionForOffset(Offset(30.0 + 16, 5)), |
| TextPosition(offset: 2, affinity: TextAffinity.upstream), |
| ); |
| |
| // Second line: "abcdefg\n" |
| |
| // At the beginning of the second line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, 15)), |
| TextPosition(offset: 5, affinity: TextAffinity.downstream), |
| ); |
| // At the end of the second line. |
| expect( |
| paragraph.getPositionForOffset(Offset(100, 15)), |
| TextPosition(offset: 12, affinity: TextAffinity.upstream), |
| ); |
| // On the left side of "e" in the second line. |
| expect( |
| // The line is centered so it's shifted to the right by "15.0px". |
| paragraph.getPositionForOffset(Offset(15.0 + 44, 15)), |
| TextPosition(offset: 9, affinity: TextAffinity.downstream), |
| ); |
| // On the right side of "e" in the second line. |
| expect( |
| // The line is centered so it's shifted to the right by "15.0px". |
| paragraph.getPositionForOffset(Offset(15.0 + 46, 15)), |
| TextPosition(offset: 10, affinity: TextAffinity.upstream), |
| ); |
| |
| // Last (third) line: "ab" |
| |
| // At the beginning of the last line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, 25)), |
| TextPosition(offset: 13, affinity: TextAffinity.downstream), |
| ); |
| // At the end of the last line. |
| expect( |
| paragraph.getPositionForOffset(Offset(100, 25)), |
| TextPosition(offset: 15, affinity: TextAffinity.upstream), |
| ); |
| // Below the last line. |
| expect( |
| paragraph.getPositionForOffset(Offset(0, 32)), |
| TextPosition(offset: 15, affinity: TextAffinity.upstream), |
| ); |
| // On the left side of "b" in the last line. |
| expect( |
| // The line is centered so it's shifted to the right by "40.0px". |
| paragraph.getPositionForOffset(Offset(40.0 + 12, 25)), |
| TextPosition(offset: 14, affinity: TextAffinity.downstream), |
| ); |
| // On the right side of "a" in the last line. |
| expect( |
| // The line is centered so it's shifted to the right by "40.0px". |
| paragraph.getPositionForOffset(Offset(40.0 + 9, 25)), |
| TextPosition(offset: 14, affinity: TextAffinity.upstream), |
| ); |
| |
| TextMeasurementService.clearCache(); |
| WebExperiments.instance.useCanvasText = null; |
| }); |
| |
| testEachMeasurement('getBoxesForRange returns a box', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| textDirection: TextDirection.rtl, |
| )); |
| builder.addText('abcd'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 1000)); |
| expect( |
| paragraph.getBoxesForRange(1, 2).single, |
| const TextBox.fromLTRBD( |
| 10, |
| 0, |
| 20, |
| 10, |
| TextDirection.rtl, |
| ), |
| ); |
| }); |
| |
| testEachMeasurement('getBoxesForRange returns a box for rich text', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| textDirection: TextDirection.ltr, |
| )); |
| builder.addText('abcd'); |
| builder.pushStyle(TextStyle(fontWeight: FontWeight.bold)); |
| builder.addText('xyz'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 1000)); |
| expect( |
| paragraph.getBoxesForRange(1, 2).single, |
| const TextBox.fromLTRBD(0, 0, 0, 10, TextDirection.ltr), |
| ); |
| }); |
| |
| testEachMeasurement( |
| 'getBoxesForRange return empty list for zero-length range', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| )); |
| builder.addText('abcd'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 1000)); |
| expect(paragraph.getBoxesForRange(0, 0), isEmpty); |
| }); |
| |
| testEachMeasurement('getBoxesForRange multi-line', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| textDirection: TextDirection.ltr, |
| )); |
| builder.addText('abcd\n'); |
| builder.addText('abcdefg\n'); |
| builder.addText('ab'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 100)); |
| |
| // First line: "abcd\n" |
| |
| // At the beginning of the first line. |
| expect( |
| paragraph.getBoxesForRange(0, 0), |
| <TextBox>[], |
| ); |
| // At the end of the first line. |
| expect( |
| paragraph.getBoxesForRange(4, 4), |
| <TextBox>[], |
| ); |
| // Between "b" and "c" in the first line. |
| expect( |
| paragraph.getBoxesForRange(2, 2), |
| <TextBox>[], |
| ); |
| // The range "ab" in the first line. |
| expect( |
| paragraph.getBoxesForRange(0, 2), |
| <TextBox>[ |
| TextBox.fromLTRBD(0.0, 0.0, 20.0, 10.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "bc" in the first line. |
| expect( |
| paragraph.getBoxesForRange(1, 3), |
| <TextBox>[ |
| TextBox.fromLTRBD(10.0, 0.0, 30.0, 10.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "d" in the first line. |
| expect( |
| paragraph.getBoxesForRange(3, 4), |
| <TextBox>[ |
| TextBox.fromLTRBD(30.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "\n" in the first line. |
| expect( |
| paragraph.getBoxesForRange(4, 5), |
| <TextBox>[ |
| TextBox.fromLTRBD(40.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "cd\n" in the first line. |
| expect( |
| paragraph.getBoxesForRange(2, 5), |
| <TextBox>[ |
| TextBox.fromLTRBD(20.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // Second line: "abcdefg\n" |
| |
| // At the beginning of the second line. |
| expect( |
| paragraph.getBoxesForRange(5, 5), |
| <TextBox>[], |
| ); |
| // At the end of the second line. |
| expect( |
| paragraph.getBoxesForRange(12, 12), |
| <TextBox>[], |
| ); |
| // The range "efg" in the second line. |
| expect( |
| paragraph.getBoxesForRange(9, 12), |
| <TextBox>[ |
| TextBox.fromLTRBD(40.0, 10.0, 70.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "bcde" in the second line. |
| expect( |
| paragraph.getBoxesForRange(6, 10), |
| <TextBox>[ |
| TextBox.fromLTRBD(10.0, 10.0, 50.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "fg\n" in the second line. |
| expect( |
| paragraph.getBoxesForRange(10, 13), |
| <TextBox>[ |
| TextBox.fromLTRBD(50.0, 10.0, 70.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // Last (third) line: "ab" |
| |
| // At the beginning of the last line. |
| expect( |
| paragraph.getBoxesForRange(13, 13), |
| <TextBox>[], |
| ); |
| // At the end of the last line. |
| expect( |
| paragraph.getBoxesForRange(15, 15), |
| <TextBox>[], |
| ); |
| // The range "a" in the last line. |
| expect( |
| paragraph.getBoxesForRange(14, 15), |
| <TextBox>[ |
| TextBox.fromLTRBD(10.0, 20.0, 20.0, 30.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "ab" in the last line. |
| expect( |
| paragraph.getBoxesForRange(13, 15), |
| <TextBox>[ |
| TextBox.fromLTRBD(0.0, 20.0, 20.0, 30.0, TextDirection.ltr), |
| ], |
| ); |
| |
| |
| // Combine multiple lines |
| |
| // The range "cd\nabc". |
| expect( |
| paragraph.getBoxesForRange(2, 8), |
| <TextBox>[ |
| TextBox.fromLTRBD(20.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 10.0, 30.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // The range "\nabcd". |
| expect( |
| paragraph.getBoxesForRange(4, 9), |
| <TextBox>[ |
| TextBox.fromLTRBD(40.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 10.0, 40.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // The range "d\nabcdefg\na". |
| expect( |
| paragraph.getBoxesForRange(3, 14), |
| <TextBox>[ |
| TextBox.fromLTRBD(30.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 10.0, 70.0, 20.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 20.0, 10.0, 30.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // The range "abcd\nabcdefg\n". |
| expect( |
| paragraph.getBoxesForRange(0, 13), |
| <TextBox>[ |
| TextBox.fromLTRBD(0.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 10.0, 70.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // The range "abcd\nabcdefg\nab". |
| expect( |
| paragraph.getBoxesForRange(0, 15), |
| <TextBox>[ |
| TextBox.fromLTRBD(0.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 10.0, 70.0, 20.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 20.0, 20.0, 30.0, TextDirection.ltr), |
| ], |
| ); |
| }); |
| |
| testEachMeasurement('getBoxesForRange with maxLines', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| textDirection: TextDirection.ltr, |
| maxLines: 2, |
| )); |
| builder.addText('abcd\n'); |
| builder.addText('abcdefg\n'); |
| builder.addText('ab'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 100)); |
| |
| // First line: "abcd\n" |
| |
| // At the beginning of the first line. |
| expect( |
| paragraph.getBoxesForRange(0, 0), |
| <TextBox>[], |
| ); |
| // At the end of the first line. |
| expect( |
| paragraph.getBoxesForRange(4, 4), |
| <TextBox>[], |
| ); |
| // Between "b" and "c" in the first line. |
| expect( |
| paragraph.getBoxesForRange(2, 2), |
| <TextBox>[], |
| ); |
| // The range "ab" in the first line. |
| expect( |
| paragraph.getBoxesForRange(0, 2), |
| <TextBox>[ |
| TextBox.fromLTRBD(0.0, 0.0, 20.0, 10.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "bc" in the first line. |
| expect( |
| paragraph.getBoxesForRange(1, 3), |
| <TextBox>[ |
| TextBox.fromLTRBD(10.0, 0.0, 30.0, 10.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "d" in the first line. |
| expect( |
| paragraph.getBoxesForRange(3, 4), |
| <TextBox>[ |
| TextBox.fromLTRBD(30.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "\n" in the first line. |
| expect( |
| paragraph.getBoxesForRange(4, 5), |
| <TextBox>[ |
| TextBox.fromLTRBD(40.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "cd\n" in the first line. |
| expect( |
| paragraph.getBoxesForRange(2, 5), |
| <TextBox>[ |
| TextBox.fromLTRBD(20.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // Second line: "abcdefg\n" |
| |
| // At the beginning of the second line. |
| expect( |
| paragraph.getBoxesForRange(5, 5), |
| <TextBox>[], |
| ); |
| // At the end of the second line. |
| expect( |
| paragraph.getBoxesForRange(12, 12), |
| <TextBox>[], |
| ); |
| // The range "efg" in the second line. |
| expect( |
| paragraph.getBoxesForRange(9, 12), |
| <TextBox>[ |
| TextBox.fromLTRBD(40.0, 10.0, 70.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "bcde" in the second line. |
| expect( |
| paragraph.getBoxesForRange(6, 10), |
| <TextBox>[ |
| TextBox.fromLTRBD(10.0, 10.0, 50.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| // The range "fg\n" in the second line. |
| expect( |
| paragraph.getBoxesForRange(10, 13), |
| <TextBox>[ |
| TextBox.fromLTRBD(50.0, 10.0, 70.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // Last (third) line: "ab" |
| |
| // At the beginning of the last line. |
| expect( |
| paragraph.getBoxesForRange(13, 13), |
| <TextBox>[], |
| ); |
| // At the end of the last line. |
| expect( |
| paragraph.getBoxesForRange(15, 15), |
| <TextBox>[], |
| ); |
| // The range "a" in the last line. |
| expect( |
| paragraph.getBoxesForRange(14, 15), |
| <TextBox>[], |
| ); |
| // The range "ab" in the last line. |
| expect( |
| paragraph.getBoxesForRange(13, 15), |
| <TextBox>[], |
| ); |
| |
| |
| // Combine multiple lines |
| |
| // The range "cd\nabc". |
| expect( |
| paragraph.getBoxesForRange(2, 8), |
| <TextBox>[ |
| TextBox.fromLTRBD(20.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 10.0, 30.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // The range "\nabcd". |
| expect( |
| paragraph.getBoxesForRange(4, 9), |
| <TextBox>[ |
| TextBox.fromLTRBD(40.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 10.0, 40.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // The range "d\nabcdefg\na". |
| expect( |
| paragraph.getBoxesForRange(3, 14), |
| <TextBox>[ |
| TextBox.fromLTRBD(30.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 10.0, 70.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // The range "abcd\nabcdefg\n". |
| expect( |
| paragraph.getBoxesForRange(0, 13), |
| <TextBox>[ |
| TextBox.fromLTRBD(0.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 10.0, 70.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| |
| // The range "abcd\nabcdefg\nab". |
| expect( |
| paragraph.getBoxesForRange(0, 15), |
| <TextBox>[ |
| TextBox.fromLTRBD(0.0, 0.0, 40.0, 10.0, TextDirection.ltr), |
| TextBox.fromLTRBD(0.0, 10.0, 70.0, 20.0, TextDirection.ltr), |
| ], |
| ); |
| }); |
| |
| test('longestLine', () { |
| // [Paragraph.longestLine] is only supported by canvas-based measurement. |
| WebExperiments.instance.useCanvasText = true; |
| TextMeasurementService.initialize(rulerCacheCapacity: 2); |
| |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| )); |
| builder.addText('abcd\nabcde abc'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 80.0)); |
| expect(paragraph.longestLine, 50.0); |
| |
| TextMeasurementService.clearCache(); |
| WebExperiments.instance.useCanvasText = null; |
| }); |
| |
| testEachMeasurement('getLineBoundary (single-line)', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| )); |
| builder.addText('One single line'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 400.0)); |
| |
| // "One single line".length == 15 |
| for (int i = 0; i < 15; i++) { |
| expect( |
| paragraph.getLineBoundary(TextPosition(offset: i)), |
| TextRange(start: 0, end: 15), |
| reason: 'failed at offset $i', |
| ); |
| } |
| }); |
| |
| test('getLineBoundary (multi-line)', () { |
| // [Paragraph.getLineBoundary] for multi-line paragraphs is only supported |
| // by canvas-based measurement. |
| WebExperiments.instance.useCanvasText = true; |
| TextMeasurementService.initialize(rulerCacheCapacity: 2); |
| |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| )); |
| builder.addText('First line\n'); |
| builder.addText('Second line\n'); |
| builder.addText('Third line'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 400.0)); |
| |
| // "First line\n".length == 11 |
| for (int i = 0; i < 11; i++) { |
| expect( |
| paragraph.getLineBoundary(TextPosition(offset: i)), |
| TextRange(start: 0, end: 11), |
| reason: 'failed at offset $i', |
| ); |
| } |
| |
| // "Second line\n".length == 12 |
| for (int i = 11; i < 23; i++) { |
| expect( |
| paragraph.getLineBoundary(TextPosition(offset: i)), |
| TextRange(start: 11, end: 23), |
| reason: 'failed at offset $i', |
| ); |
| } |
| |
| // "Third line".length == 10 |
| for (int i = 23; i < 33; i++) { |
| expect( |
| paragraph.getLineBoundary(TextPosition(offset: i)), |
| TextRange(start: 23, end: 33), |
| reason: 'failed at offset $i', |
| ); |
| } |
| |
| TextMeasurementService.clearCache(); |
| WebExperiments.instance.useCanvasText = null; |
| }); |
| |
| testEachMeasurement('width should be a whole integer', () { |
| final ParagraphBuilder builder = ParagraphBuilder(ParagraphStyle( |
| fontFamily: 'Ahem', |
| fontStyle: FontStyle.normal, |
| fontWeight: FontWeight.normal, |
| fontSize: 10, |
| textDirection: TextDirection.ltr, |
| )); |
| builder.addText('abc'); |
| final Paragraph paragraph = builder.build(); |
| paragraph.layout(const ParagraphConstraints(width: 30.8)); |
| |
| expect(paragraph.width, 30); |
| expect(paragraph.height, 10); |
| }); |
| } |
