// 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: 'π©β<zwj>π©β<zwj>π¦π©β<zwj>π©β<zwj>π§β<zwj>π§πΊπΈ' // One three-person family, one four person family, one US flag. const String text = 'π©βπ©βπ¦π©βπ©βπ§βπ§πΊπΈ'; painter.text = const TextSpan(text: text); painter.layout(maxWidth: 10000); expect(text.length, 23); Offset caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0), ui.Rect.zero); expect(caretOffset.dx, 0); // π©β 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); // π©β 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); // π©β caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 4), ui.Rect.zero); expect(caretOffset.dx, 42); // π©β 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); // π¦ caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 7), ui.Rect.zero); expect(caretOffset.dx, 42); // π¦ caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 8), ui.Rect.zero); expect(caretOffset.dx, 42); // π©β caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 9), ui.Rect.zero); expect(caretOffset.dx, 98); // π©β 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); // π©β caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 12), ui.Rect.zero); expect(caretOffset.dx, 98); // π©β 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); // π§β caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 15), ui.Rect.zero); expect(caretOffset.dx, 98); // π§β 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); // π§ caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 18), ui.Rect.zero); expect(caretOffset.dx, 98); // π§ caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 19), ui.Rect.zero); expect(caretOffset.dx, 98); // πΊ caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 20), ui.Rect.zero); expect(caretOffset.dx, 112); // πΊ caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 21), ui.Rect.zero); expect(caretOffset.dx, 112); // πΈ caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 22), ui.Rect.zero); expect(caretOffset.dx, 112); // πΈ }); 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); // The end of the line is 441, but the width is only 420, so the cursor is // stopped there without overflowing. expect(caretOffset.dx, painter.width); 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; const double SIZE_OF_A = 14.0; // square size of "a" character String text = 'aaa'; painter.text = TextSpan(text: text); painter.layout(); // getOffsetForCaret in a plain one-line string is the same for either affinity. int offset = 0; painter.text = TextSpan(text: text); painter.layout(); Offset caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(SIZE_OF_A * offset, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: ui.TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(SIZE_OF_A * offset, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); offset = 1; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(SIZE_OF_A * offset, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: ui.TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(SIZE_OF_A * offset, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); offset = 2; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(SIZE_OF_A * offset, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: ui.TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(SIZE_OF_A * offset, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); offset = 3; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(SIZE_OF_A * offset, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: ui.TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(SIZE_OF_A * offset, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); // For explicit newlines, getOffsetForCaret places the caret at the location // indicated by offset regardless of affinity. text = '\n\n'; painter.text = TextSpan(text: text); painter.layout(); offset = 0; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: ui.TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); offset = 1; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: ui.TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); offset = 2; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A * 2, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: ui.TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A * 2, 0.0001)); // getOffsetForCaret in an unwrapped string with explicit newlines is the // same for either affinity. text = '\naaa'; painter.text = TextSpan(text: text); painter.layout(); offset = 0; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: ui.TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); offset = 1; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: ui.TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); // When text wraps on its own, getOffsetForCaret disambiguates between the // end of one line and start of next using affinity. text = 'aaaaaaaa'; // Just enough to wrap one character down to second line painter.text = TextSpan(text: text); painter.layout(maxWidth: 100); // SIZE_OF_A * text.length > 100, so it wraps caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: text.length - 1), ui.Rect.zero, ); // When affinity is downstream, cursor is at beginning of second line expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: text.length - 1, affinity: ui.TextAffinity.upstream), ui.Rect.zero, ); // When affinity is upstream, cursor is at end of first line expect(caretOffset.dx, closeTo(98.0, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); // When given a string with a newline at the end, getOffsetForCaret puts // the cursor at the start of the next line regardless of affinity text = 'aaa\n'; painter.text = TextSpan(text: text); painter.layout(); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: text.length), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); offset = text.length; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); // Given a one-line right aligned string, positioning the cursor at offset 0 // means that it appears at the "end" of the string, after the character // that was typed first, at x=0. painter.textAlign = TextAlign.right; text = 'aaa'; painter.text = TextSpan(text: text); painter.layout(); offset = 0; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); painter.textAlign = TextAlign.left; // When given an offset after a newline in the middle of a string, // getOffsetForCaret returns the start of the next line regardless of // affinity. text = 'aaa\naaa'; painter.text = TextSpan(text: text); painter.layout(); offset = 4; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); // When given a string with multiple trailing newlines, places the caret // in the position given by offset regardless of affinity. text = 'aaa\n\n\n'; offset = 3; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(SIZE_OF_A * 3, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(SIZE_OF_A * 3, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); offset = 4; painter.text = TextSpan(text: text); painter.layout(); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); offset = 5; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A * 2, 0.001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A * 2, 0.0001)); offset = 6; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A * 3, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A * 3, 0.0001)); // When given a string with multiple leading newlines, places the caret in // the position given by offset regardless of affinity. text = '\n\n\naaa'; offset = 3; painter.text = TextSpan(text: text); painter.layout(); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A * 3, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A * 3, 0.0001)); offset = 2; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A * 2, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A * 2, 0.0001)); offset = 1; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy,closeTo(SIZE_OF_A, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(SIZE_OF_A, 0.0001)); offset = 0; caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); caretOffset = painter.getOffsetForCaret( ui.TextPosition(offset: offset, affinity: TextAffinity.upstream), ui.Rect.zero, ); expect(caretOffset.dx, closeTo(0.0, 0.0001)); expect(caretOffset.dy, closeTo(0.0, 0.0001)); }); }