| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| import 'dart:ui' as ui; |
| |
| import 'package:flutter/painting.dart'; |
| import 'package:flutter_test/flutter_test.dart'; |
| |
| void main() { |
| test('TextPainter caret test', () { |
| final TextPainter painter = TextPainter() |
| ..textDirection = TextDirection.ltr; |
| |
| String text = 'A'; |
| painter.text = TextSpan(text: text); |
| painter.layout(); |
| |
| Offset caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0), ui.Rect.zero); |
| expect(caretOffset.dx, 0); |
| caretOffset = painter.getOffsetForCaret(ui.TextPosition(offset: text.length), ui.Rect.zero); |
| expect(caretOffset.dx, painter.width); |
| |
| // Check that getOffsetForCaret handles a character that is encoded as a surrogate pair. |
| text = 'A\u{1F600}'; |
| painter.text = TextSpan(text: text); |
| painter.layout(); |
| caretOffset = painter.getOffsetForCaret(ui.TextPosition(offset: text.length), ui.Rect.zero); |
| expect(caretOffset.dx, painter.width); |
| }); |
| |
| test('TextPainter null text test', () { |
| final TextPainter painter = TextPainter() |
| ..textDirection = TextDirection.ltr; |
| |
| List<TextSpan> children = <TextSpan>[const TextSpan(text: 'B'), const TextSpan(text: 'C')]; |
| painter.text = TextSpan(text: null, children: children); |
| painter.layout(); |
| |
| Offset caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0), ui.Rect.zero); |
| expect(caretOffset.dx, 0); |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 1), ui.Rect.zero); |
| expect(caretOffset.dx, painter.width / 2); |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 2), ui.Rect.zero); |
| expect(caretOffset.dx, painter.width); |
| |
| children = <TextSpan>[]; |
| painter.text = TextSpan(text: null, children: children); |
| painter.layout(); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0), ui.Rect.zero); |
| expect(caretOffset.dx, 0); |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 1), ui.Rect.zero); |
| expect(caretOffset.dx, 0); |
| }); |
| |
| test('TextPainter caret emoji test', () { |
| final TextPainter painter = TextPainter() |
| ..textDirection = TextDirection.ltr; |
| |
| // Format: '👩<zwj>👩<zwj>👦👩<zwj>👩<zwj>👧<zwj>👧🇺🇸' |
| // One three-person family, one four person family, one US flag. |
| const String text = '👩👩👦👩👩👧👧🇺🇸'; |
| painter.text = const TextSpan(text: text); |
| painter.layout(); |
| |
| expect(text.length, 23); |
| |
| Offset caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0), ui.Rect.zero); |
| expect(caretOffset.dx, 0); // 👩 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: text.length), ui.Rect.zero); |
| expect(caretOffset.dx, painter.width); |
| |
| // Two UTF-16 codepoints per emoji, one codepoint per zwj |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 1), ui.Rect.zero); |
| expect(caretOffset.dx, 42); // 👩 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 2), ui.Rect.zero); |
| expect(caretOffset.dx, 42); // <zwj> |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 3), ui.Rect.zero); |
| expect(caretOffset.dx, 42); // 👩 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 4), ui.Rect.zero); |
| expect(caretOffset.dx, 42); // 👩 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 5), ui.Rect.zero); |
| expect(caretOffset.dx, 42); // <zwj> |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 6), ui.Rect.zero); |
| expect(caretOffset.dx, 42); // 👦 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 7), ui.Rect.zero); |
| expect(caretOffset.dx, 42); // 👦 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 8), ui.Rect.zero); |
| expect(caretOffset.dx, 42); // 👩 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 9), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // 👩 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 10), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // <zwj> |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 11), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // 👩 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 12), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // 👩 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 13), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // <zwj> |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 14), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // 👧 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 15), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // 👧 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 16), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // <zwj> |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 17), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // 👧 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 18), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // 👧 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 19), ui.Rect.zero); |
| expect(caretOffset.dx, 98); // 🇺 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 20), ui.Rect.zero); |
| expect(caretOffset.dx, 112); // 🇺 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 21), ui.Rect.zero); |
| expect(caretOffset.dx, 112); // 🇸 |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 22), ui.Rect.zero); |
| expect(caretOffset.dx, 112); // 🇸 |
| }); |
| |
| test('TextPainter caret center space test', () { |
| final TextPainter painter = TextPainter() |
| ..textDirection = TextDirection.ltr; |
| |
| const String text = 'test text with space at end '; |
| painter.text = const TextSpan(text: text); |
| painter.textAlign = TextAlign.center; |
| painter.layout(); |
| |
| Offset caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0), ui.Rect.zero); |
| expect(caretOffset.dx, 21); |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: text.length), ui.Rect.zero); |
| expect(caretOffset.dx, 399); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 1), ui.Rect.zero); |
| expect(caretOffset.dx, 35); |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 2), ui.Rect.zero); |
| expect(caretOffset.dx, 49); |
| }); |
| |
| test('TextPainter error test', () { |
| final TextPainter painter = TextPainter(textDirection: TextDirection.ltr); |
| expect(() { painter.paint(null, Offset.zero); }, throwsFlutterError); |
| }); |
| |
| test('TextPainter requires textDirection', () { |
| final TextPainter painter1 = TextPainter(text: const TextSpan(text: '')); |
| expect(() { painter1.layout(); }, throwsAssertionError); |
| final TextPainter painter2 = TextPainter(text: const TextSpan(text: ''), textDirection: TextDirection.rtl); |
| expect(() { painter2.layout(); }, isNot(throwsException)); |
| }); |
| |
| test('TextPainter size test', () { |
| final TextPainter painter = TextPainter( |
| text: const TextSpan( |
| text: 'X', |
| style: TextStyle( |
| inherit: false, |
| fontFamily: 'Ahem', |
| fontSize: 123.0, |
| ), |
| ), |
| textDirection: TextDirection.ltr, |
| ); |
| painter.layout(); |
| expect(painter.size, const Size(123.0, 123.0)); |
| }); |
| |
| test('TextPainter textScaleFactor test', () { |
| final TextPainter painter = TextPainter( |
| text: const TextSpan( |
| text: 'X', |
| style: TextStyle( |
| inherit: false, |
| fontFamily: 'Ahem', |
| fontSize: 10.0, |
| ), |
| ), |
| textDirection: TextDirection.ltr, |
| textScaleFactor: 2.0, |
| ); |
| painter.layout(); |
| expect(painter.size, const Size(20.0, 20.0)); |
| }); |
| |
| test('TextPainter default text height is 14 pixels', () { |
| final TextPainter painter = TextPainter( |
| text: const TextSpan(text: 'x'), |
| textDirection: TextDirection.ltr, |
| ); |
| painter.layout(); |
| expect(painter.preferredLineHeight, 14.0); |
| expect(painter.size, const Size(14.0, 14.0)); |
| }); |
| |
| test('TextPainter sets paragraph size from root', () { |
| final TextPainter painter = TextPainter( |
| text: const TextSpan(text: 'x', style: TextStyle(fontSize: 100.0)), |
| textDirection: TextDirection.ltr, |
| ); |
| painter.layout(); |
| expect(painter.preferredLineHeight, 100.0); |
| expect(painter.size, const Size(100.0, 100.0)); |
| }); |
| |
| test('TextPainter intrinsic dimensions', () { |
| const TextStyle style = TextStyle( |
| inherit: false, |
| fontFamily: 'Ahem', |
| fontSize: 10.0, |
| ); |
| TextPainter painter; |
| |
| painter = TextPainter( |
| text: const TextSpan( |
| text: 'X X X', |
| style: style, |
| ), |
| textDirection: TextDirection.ltr, |
| ); |
| painter.layout(); |
| expect(painter.size, const Size(50.0, 10.0)); |
| expect(painter.minIntrinsicWidth, 10.0); |
| expect(painter.maxIntrinsicWidth, 50.0); |
| |
| painter = TextPainter( |
| text: const TextSpan( |
| text: 'X X X', |
| style: style, |
| ), |
| textDirection: TextDirection.ltr, |
| ellipsis: 'e', |
| ); |
| painter.layout(); |
| expect(painter.size, const Size(50.0, 10.0)); |
| expect(painter.minIntrinsicWidth, 50.0); |
| expect(painter.maxIntrinsicWidth, 50.0); |
| |
| painter = TextPainter( |
| text: const TextSpan( |
| text: 'X X XXXX', |
| style: style, |
| ), |
| textDirection: TextDirection.ltr, |
| maxLines: 2, |
| ); |
| painter.layout(); |
| expect(painter.size, const Size(80.0, 10.0)); |
| expect(painter.minIntrinsicWidth, 40.0); |
| expect(painter.maxIntrinsicWidth, 80.0); |
| |
| painter = TextPainter( |
| text: const TextSpan( |
| text: 'X X XXXX XX', |
| style: style, |
| ), |
| textDirection: TextDirection.ltr, |
| maxLines: 2, |
| ); |
| painter.layout(); |
| expect(painter.size, const Size(110.0, 10.0)); |
| expect(painter.minIntrinsicWidth, 70.0); |
| expect(painter.maxIntrinsicWidth, 110.0); |
| |
| painter = TextPainter( |
| text: const TextSpan( |
| text: 'XXXXXXXX XXXX XX X', |
| style: style, |
| ), |
| textDirection: TextDirection.ltr, |
| maxLines: 2, |
| ); |
| painter.layout(); |
| expect(painter.size, const Size(180.0, 10.0)); |
| expect(painter.minIntrinsicWidth, 90.0); |
| expect(painter.maxIntrinsicWidth, 180.0); |
| |
| painter = TextPainter( |
| text: const TextSpan( |
| text: 'X XX XXXX XXXXXXXX', |
| style: style, |
| ), |
| textDirection: TextDirection.ltr, |
| maxLines: 2, |
| ); |
| painter.layout(); |
| expect(painter.size, const Size(180.0, 10.0)); |
| expect(painter.minIntrinsicWidth, 90.0); |
| expect(painter.maxIntrinsicWidth, 180.0); |
| }, skip: true); // https://github.com/flutter/flutter/issues/13512 |
| |
| test('TextPainter handles newlines properly', () { |
| final TextPainter painter = TextPainter() |
| ..textDirection = TextDirection.ltr; |
| |
| String text = 'aaa'; |
| painter.text = TextSpan(text: text); |
| painter.layout(); |
| |
| Offset caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| caretOffset = painter.getOffsetForCaret(ui.TextPosition(offset: text.length), ui.Rect.zero); |
| expect(caretOffset.dx, painter.width); |
| expect(caretOffset.dy, closeTo(0.0, 0.0001)); |
| |
| // Check that getOffsetForCaret handles a trailing newline when affinity is downstream. |
| text = 'aaa\n'; |
| painter.text = TextSpan(text: text); |
| painter.layout(); |
| caretOffset = painter.getOffsetForCaret(ui.TextPosition(offset: text.length, affinity: TextAffinity.downstream), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(14.0, 0.0001)); |
| |
| // Check that getOffsetForCaret handles a trailing newline when affinity is upstream. |
| text = 'aaa\n'; |
| painter.text = TextSpan(text: text); |
| painter.layout(); |
| caretOffset = painter.getOffsetForCaret(ui.TextPosition(offset: text.length, affinity: TextAffinity.upstream), ui.Rect.zero); |
| expect(caretOffset.dx, painter.width); |
| expect(caretOffset.dy, closeTo(0.0, 0.0001)); |
| |
| // Correctly moves through second line with downstream affinity. |
| text = 'aaa\naaa'; |
| painter.text = TextSpan(text: text); |
| painter.layout(); |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 4), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(14.0, 0.0001)); |
| |
| // Correctly moves through second line with upstream affinity. |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 4, affinity: TextAffinity.upstream), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(42.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(0.0, 0.0001)); |
| |
| // Correctly handles multiple trailing newlines. |
| text = 'aaa\n\n\n'; |
| painter.text = TextSpan(text: text); |
| painter.layout(); |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 4), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(14.0, 0.001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 5), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(28.0, 0.001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 6), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(42.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 6, affinity: TextAffinity.upstream), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(28.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 5, affinity: TextAffinity.upstream), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(14.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 4, affinity: TextAffinity.upstream), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(42.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(0.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 3, affinity: TextAffinity.upstream), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(42.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(0.0, 0.0001)); |
| |
| // Correctly handles multiple leading newlines |
| text = '\n\n\naaa'; |
| painter.text = TextSpan(text: text); |
| painter.layout(); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 3), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(42.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 2), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(28.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 1), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy,closeTo(14.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(0.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0, affinity: TextAffinity.upstream), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(0.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 1, affinity: TextAffinity.upstream), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(0.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 2, affinity: TextAffinity.upstream), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(14.0, 0.0001)); |
| |
| caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 3, affinity: TextAffinity.upstream), ui.Rect.zero); |
| expect(caretOffset.dx, closeTo(0.0, 0.0001)); |
| expect(caretOffset.dy, closeTo(28.0, 0.0001)); |
| }); |
| } |
