text_painter_rtl_test.dart 30 KB
Newer Older
Ian Hickson's avatar
Ian Hickson committed
1 2 3 4 5 6 7 8 9 10 11 12 13
// 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 'package:flutter/foundation.dart';
import 'package:flutter/painting.dart';
import 'package:flutter_test/flutter_test.dart';

const bool skipTestsWithKnownBugs = true;
const bool skipExpectsWithKnownBugs = false;

void main() {
  test('TextPainter - basic words', () {
14
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
15 16 17 18
      ..textDirection = TextDirection.ltr;

    painter.text = const TextSpan(
      text: 'ABC DEF\nGHI',
19
      style: TextStyle(fontFamily: 'Ahem', fontSize: 10.0),
Ian Hickson's avatar
Ian Hickson committed
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
    );
    painter.layout();

    expect(
      painter.getWordBoundary(const TextPosition(offset: 1, affinity: TextAffinity.downstream)),
      const TextRange(start: 0, end: 3),
    );
    expect(
      painter.getWordBoundary(const TextPosition(offset: 5, affinity: TextAffinity.downstream)),
      const TextRange(start: 4, end: 7),
    );
    expect(
      painter.getWordBoundary(const TextPosition(offset: 9, affinity: TextAffinity.downstream)),
      const TextRange(start: 8, end: 11),
    );
  });

  test('TextPainter - bidi overrides in LTR', () {
38
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
39 40 41 42 43
      ..textDirection = TextDirection.ltr;

    painter.text = const TextSpan(
      text: '${Unicode.RLO}HEBREW1 ${Unicode.LRO}english2${Unicode.PDF} HEBREW3${Unicode.PDF}',
           //      0       12345678      9      101234567       18     90123456       27
44
      style: TextStyle(fontFamily: 'Ahem', fontSize: 10.0),
Ian Hickson's avatar
Ian Hickson committed
45
    );
46 47
    TextSpan textSpan = painter.text;
    expect(textSpan.text.length, 28);
Ian Hickson's avatar
Ian Hickson committed
48 49
    painter.layout();

50 51 52
    // The skips here are because the old rendering code considers the bidi formatting characters
    // to be part of the word sometimes and not others, which is fine, but we'd mildly prefer if
    // we were consistently considering them part of words always.
Ian Hickson's avatar
Ian Hickson committed
53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121
    final TextRange hebrew1 = painter.getWordBoundary(const TextPosition(offset: 4, affinity: TextAffinity.downstream));
    expect(hebrew1, const TextRange(start: 0, end: 8), skip: skipExpectsWithKnownBugs);
    final TextRange english2 = painter.getWordBoundary(const TextPosition(offset: 14, affinity: TextAffinity.downstream));
    expect(english2, const TextRange(start: 9, end: 19), skip: skipExpectsWithKnownBugs);
    final TextRange hebrew3 = painter.getWordBoundary(const TextPosition(offset: 24, affinity: TextAffinity.downstream));
    expect(hebrew3, const TextRange(start: 20, end: 28));

    //                              >>>>>>>>>>>>>>>                       embedding level 2
    //              <==============================================       embedding level 1
    //             ------------------------------------------------>      embedding level 0
    //            0 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 2
    //            0 6 5 4 3 2 1 0 9 0 1 2 3 4 5 6 7 8 7 6 5 4 3 2 1 7  <- index of character in string
    // Paints as:   3 W E R B E H   e n g l i s h 2   1 W E R B E H
    //             0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2   <- pixel offset at boundary
    //             0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
    //             0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 0, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(0.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 0, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(0.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 1, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(240.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 1, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(240.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 7, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(180.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 7, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(180.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 8, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(170.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 8, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(170.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 9, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(160.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 9, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(160.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 10, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(80.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 10, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(80.0, 0.0),
    );

    expect(
      painter.getBoxesForSelection(const TextSelection(baseOffset: 0, extentOffset: 27)),
      const <TextBox>[
122 123 124
        TextBox.fromLTRBD(160.0, 0.0, 240.0, 10.0, TextDirection.rtl), // HEBREW1
        TextBox.fromLTRBD( 80.0, 0.0, 160.0, 10.0, TextDirection.ltr), // english2
        TextBox.fromLTRBD(  0.0, 0.0,  80.0, 10.0, TextDirection.rtl), // HEBREW3
Ian Hickson's avatar
Ian Hickson committed
125 126 127 128 129
      ],
      // Horizontal offsets are currently one pixel off in places; vertical offsets are good.
      // The list is currently in the wrong order (so selection boxes will paint in the wrong order).
    );

130
    textSpan = painter.text;
131 132 133 134
    final List<List<TextBox>> list = <List<TextBox>>[
      for (int index = 0; index < textSpan.text.length; index += 1)
        painter.getBoxesForSelection(TextSelection(baseOffset: index, extentOffset: index + 1)),
    ];
Ian Hickson's avatar
Ian Hickson committed
135
    expect(list, const <List<TextBox>>[
136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163
      <TextBox>[], // U+202E, non-printing Unicode bidi formatting character
      <TextBox>[TextBox.fromLTRBD(230.0, 0.0, 240.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(220.0, 0.0, 230.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(210.0, 0.0, 220.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(200.0, 0.0, 210.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(190.0, 0.0, 200.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(180.0, 0.0, 190.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(170.0, 0.0, 180.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(160.0, 0.0, 170.0, 10.0, TextDirection.rtl)],
      <TextBox>[], // U+202D, non-printing Unicode bidi formatting character
      <TextBox>[TextBox.fromLTRBD(80.0, 0.0, 90.0, 10.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(90.0, 0.0, 100.0, 10.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(100.0, 0.0, 110.0, 10.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(110.0, 0.0, 120.0, 10.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(120.0, 0.0, 130.0, 10.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(130.0, 0.0, 140.0, 10.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(140.0, 0.0, 150.0, 10.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(150.0, 0.0, 160.0, 10.0, TextDirection.ltr)],
      <TextBox>[], // U+202C, non-printing Unicode bidi formatting character
      <TextBox>[TextBox.fromLTRBD(70.0, 0.0, 80.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(60.0, 0.0, 70.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(50.0, 0.0, 60.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(40.0, 0.0, 50.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(30.0, 0.0, 40.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(20.0, 0.0, 30.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(10.0, 0.0, 20.0, 10.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(0.0, 0.0, 10.0, 10.0, TextDirection.rtl)],
      <TextBox>[], // U+202C, non-printing Unicode bidi formatting character
Ian Hickson's avatar
Ian Hickson committed
164 165 166 167 168 169
      // The list currently has one extra bogus entry (the last entry, for the
      // trailing U+202C PDF, should be empty but is one-pixel-wide instead).
    ], skip: skipExpectsWithKnownBugs);
  }, skip: skipTestsWithKnownBugs);

  test('TextPainter - bidi overrides in RTL', () {
170
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
171 172 173 174 175
      ..textDirection = TextDirection.rtl;

    painter.text = const TextSpan(
      text: '${Unicode.RLO}HEBREW1 ${Unicode.LRO}english2${Unicode.PDF} HEBREW3${Unicode.PDF}',
           //      0       12345678      9      101234567       18     90123456       27
176
      style: TextStyle(fontFamily: 'Ahem', fontSize: 10.0),
Ian Hickson's avatar
Ian Hickson committed
177
    );
178 179
    final TextSpan textSpan = painter.text;
    expect(textSpan.text.length, 28);
Ian Hickson's avatar
Ian Hickson committed
180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249
    painter.layout();

    final TextRange hebrew1 = painter.getWordBoundary(const TextPosition(offset: 4, affinity: TextAffinity.downstream));
    expect(hebrew1, const TextRange(start: 0, end: 8), skip: skipExpectsWithKnownBugs);
    final TextRange english2 = painter.getWordBoundary(const TextPosition(offset: 14, affinity: TextAffinity.downstream));
    expect(english2, const TextRange(start: 9, end: 19), skip: skipExpectsWithKnownBugs);
    final TextRange hebrew3 = painter.getWordBoundary(const TextPosition(offset: 24, affinity: TextAffinity.downstream));
    expect(hebrew3, const TextRange(start: 20, end: 28));

    //                              >>>>>>>>>>>>>>>                       embedding level 2
    //            <==================================================     embedding level 1
    //            2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
    //            7 6 5 4 3 2 1 0 9 0 1 2 3 4 5 6 7 8 7 6 5 4 3 2 1 0  <- index of character in string
    // Paints as:   3 W E R B E H   e n g l i s h 2   1 W E R B E H
    //             0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2   <- pixel offset at boundary
    //             0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
    //             0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 0, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(240.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 0, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(240.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 1, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(240.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 1, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(240.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 7, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(180.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 7, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(180.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 8, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(170.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 8, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(170.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 9, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(160.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 9, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(160.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 10, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(80.0, 0.0),
    );
    expect(
      painter.getOffsetForCaret(const TextPosition(offset: 10, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(80.0, 0.0),
    );

    expect(
      painter.getBoxesForSelection(const TextSelection(baseOffset: 0, extentOffset: 27)),
      const <TextBox>[
250 251 252
        TextBox.fromLTRBD(160.0, 0.0, 240.0, 10.0, TextDirection.rtl), // HEBREW1
        TextBox.fromLTRBD( 80.0, 0.0, 160.0, 10.0, TextDirection.ltr), // english2
        TextBox.fromLTRBD(  0.0, 0.0,  80.0, 10.0, TextDirection.rtl), // HEBREW3
Ian Hickson's avatar
Ian Hickson committed
253 254 255 256 257 258 259 260
      ],
      // Horizontal offsets are currently one pixel off in places; vertical offsets are good.
      // The list is currently in the wrong order (so selection boxes will paint in the wrong order).
      skip: skipExpectsWithKnownBugs,
    );
  }, skip: skipTestsWithKnownBugs);

  test('TextPainter - forced line-wrapping with bidi', () {
261
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
262 263 264 265
      ..textDirection = TextDirection.ltr;

    painter.text = const TextSpan(
      text: 'A\u05D0', // A, Alef
266
      style: TextStyle(fontFamily: 'Ahem', fontSize: 10.0),
Ian Hickson's avatar
Ian Hickson committed
267
    );
268 269
    final TextSpan textSpan = painter.text;
    expect(textSpan.text.length, 2);
Ian Hickson's avatar
Ian Hickson committed
270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308
    painter.layout(maxWidth: 10.0);

    for (int index = 0; index <= 2; index += 1) {
      expect(
        painter.getWordBoundary(const TextPosition(offset: 0, affinity: TextAffinity.downstream)),
        const TextRange(start: 0, end: 2),
      );
    }

    expect( // before the A
      painter.getOffsetForCaret(const TextPosition(offset: 0, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(0.0, 0.0),
    );
    expect( // before the A
      painter.getOffsetForCaret(const TextPosition(offset: 0, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(0.0, 0.0),
    );

    expect( // between A and Alef, after the A
      painter.getOffsetForCaret(const TextPosition(offset: 1, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(10.0, 0.0),
    );
    expect( // between A and Alef, before the Alef
      painter.getOffsetForCaret(const TextPosition(offset: 1, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(10.0, 10.0),
    );

    expect( // after the Alef
      painter.getOffsetForCaret(const TextPosition(offset: 2, affinity: TextAffinity.upstream), Rect.zero),
      const Offset(0.0, 10.0),
    );
    expect( // after the Alef
      painter.getOffsetForCaret(const TextPosition(offset: 2, affinity: TextAffinity.downstream), Rect.zero),
      const Offset(0.0, 10.0),
    );

    expect(
      painter.getBoxesForSelection(const TextSelection(baseOffset: 0, extentOffset: 2)),
      const <TextBox>[
309 310
        TextBox.fromLTRBD(0.0,  0.0, 10.0, 10.0, TextDirection.ltr), // A
        TextBox.fromLTRBD(0.0, 10.0, 10.0, 20.0, TextDirection.rtl), // Alef
Ian Hickson's avatar
Ian Hickson committed
311 312 313 314 315
      ],
    );
    expect(
      painter.getBoxesForSelection(const TextSelection(baseOffset: 0, extentOffset: 1)),
      const <TextBox>[
316
        TextBox.fromLTRBD(0.0,  0.0, 10.0, 10.0, TextDirection.ltr), // A
Ian Hickson's avatar
Ian Hickson committed
317 318 319 320 321
      ],
    );
    expect(
      painter.getBoxesForSelection(const TextSelection(baseOffset: 1, extentOffset: 2)),
      const <TextBox>[
322
        TextBox.fromLTRBD(0.0, 10.0, 10.0, 20.0, TextDirection.rtl), // Alef
Ian Hickson's avatar
Ian Hickson committed
323 324
      ],
    );
325
  },
326
  // Ahem-based tests don't yet quite work on Windows or some MacOS environments
327
  skip: !isLinux);
Ian Hickson's avatar
Ian Hickson committed
328 329

  test('TextPainter - line wrap mid-word', () {
330
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
331 332 333
      ..textDirection = TextDirection.ltr;

    painter.text = const TextSpan(
334 335 336
      style: TextStyle(fontFamily: 'Ahem', fontSize: 10.0),
      children: <TextSpan>[
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
337 338
          text: 'hello', // width 50
        ),
339
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
340
          text: 'lovely', // width 120
341
          style: TextStyle(fontFamily: 'Ahem', fontSize: 20.0),
Ian Hickson's avatar
Ian Hickson committed
342
        ),
343
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
344 345 346 347 348 349 350 351 352
          text: 'world', // width 50
        ),
      ],
    );
    painter.layout(maxWidth: 110.0); // half-way through "lovely"

    expect(
      painter.getBoxesForSelection(const TextSelection(baseOffset: 0, extentOffset: 16)),
      const <TextBox>[
353 354 355 356
        TextBox.fromLTRBD( 0.0,  8.0,  50.0, 18.0, TextDirection.ltr),
        TextBox.fromLTRBD(50.0,  0.0, 110.0, 20.0, TextDirection.ltr),
        TextBox.fromLTRBD( 0.0, 20.0,  60.0, 40.0, TextDirection.ltr),
        TextBox.fromLTRBD(60.0, 28.0, 110.0, 38.0, TextDirection.ltr),
Ian Hickson's avatar
Ian Hickson committed
357 358 359 360 361 362
      ],
      skip: skipExpectsWithKnownBugs, // horizontal offsets are one pixel off in places; vertical offsets are good
    );
  }, skip: skipTestsWithKnownBugs);

  test('TextPainter - line wrap mid-word, bidi - LTR base', () {
363
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
364 365 366
      ..textDirection = TextDirection.ltr;

    painter.text = const TextSpan(
367 368 369
      style: TextStyle(fontFamily: 'Ahem', fontSize: 10.0),
      children: <TextSpan>[
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
370 371
          text: 'hello', // width 50
        ),
372
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
373
          text: '\u062C\u0645\u064A\u0644', // width 80
374
          style: TextStyle(fontFamily: 'Ahem', fontSize: 20.0),
Ian Hickson's avatar
Ian Hickson committed
375
        ),
376
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
377 378 379 380 381 382 383 384 385
          text: 'world', // width 50
        ),
      ],
    );
    painter.layout(maxWidth: 90.0); // half-way through the Arabic word

    expect(
      painter.getBoxesForSelection(const TextSelection(baseOffset: 0, extentOffset: 16)),
      const <TextBox>[
386 387 388 389
        TextBox.fromLTRBD( 0.0,  8.0, 50.0, 18.0, TextDirection.ltr),
        TextBox.fromLTRBD(50.0,  0.0, 90.0, 20.0, TextDirection.rtl),
        TextBox.fromLTRBD( 0.0, 20.0, 40.0, 40.0, TextDirection.rtl),
        TextBox.fromLTRBD(40.0, 28.0, 90.0, 38.0, TextDirection.ltr),
Ian Hickson's avatar
Ian Hickson committed
390 391 392 393
      ],
      skip: skipExpectsWithKnownBugs, // horizontal offsets are one pixel off in places; vertical offsets are good
    );

394 395 396 397 398
    final List<List<TextBox>> list = <List<TextBox>>[
      for (int index = 0; index < 5+4+5; index += 1)
        painter.getBoxesForSelection(TextSelection(baseOffset: index, extentOffset: index + 1)),
    ];

Ian Hickson's avatar
Ian Hickson committed
399
    expect(list, const <List<TextBox>>[
400 401 402 403 404 405 406 407 408 409 410 411 412
      <TextBox>[TextBox.fromLTRBD(0.0, 8.0, 10.0, 18.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(10.0, 8.0, 20.0, 18.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(20.0, 8.0, 30.0, 18.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(30.0, 8.0, 40.0, 18.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(40.0, 8.0, 50.0, 18.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(70.0, 0.0, 90.0, 20.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(50.0, 0.0, 70.0, 20.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(20.0, 20.0, 40.0, 40.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(0.0, 20.0, 20.0, 40.0, TextDirection.rtl)],
      <TextBox>[TextBox.fromLTRBD(40.0, 28.0, 50.0, 38.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(50.0, 28.0, 60.0, 38.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(60.0, 28.0, 70.0, 38.0, TextDirection.ltr)],
      <TextBox>[TextBox.fromLTRBD(70.0, 28.0, 80.0, 38.0, TextDirection.ltr)],
413
      <TextBox>[TextBox.fromLTRBD(80.0, 28.0, 90.0, 38.0, TextDirection.ltr)],
Ian Hickson's avatar
Ian Hickson committed
414 415 416 417
    ]);
  }, skip: skipTestsWithKnownBugs);

  test('TextPainter - line wrap mid-word, bidi - RTL base', () {
418
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
419 420 421
      ..textDirection = TextDirection.rtl;

    painter.text = const TextSpan(
422 423 424
      style: TextStyle(fontFamily: 'Ahem', fontSize: 10.0),
      children: <TextSpan>[
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
425 426
          text: 'hello', // width 50
        ),
427
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
428
          text: '\u062C\u0645\u064A\u0644', // width 80
429
          style: TextStyle(fontFamily: 'Ahem', fontSize: 20.0),
Ian Hickson's avatar
Ian Hickson committed
430
        ),
431
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
432 433 434 435 436 437 438 439 440
          text: 'world', // width 50
        ),
      ],
    );
    painter.layout(maxWidth: 90.0); // half-way through the Arabic word

    expect(
      painter.getBoxesForSelection(const TextSelection(baseOffset: 0, extentOffset: 16)),
      const <TextBox>[
441 442 443 444
        TextBox.fromLTRBD(40.0,  8.0, 90.0, 18.0, TextDirection.ltr),
        TextBox.fromLTRBD( 0.0,  0.0, 40.0, 20.0, TextDirection.rtl),
        TextBox.fromLTRBD(50.0, 20.0, 90.0, 40.0, TextDirection.rtl),
        TextBox.fromLTRBD( 0.0, 28.0, 50.0, 38.0, TextDirection.ltr),
Ian Hickson's avatar
Ian Hickson committed
445 446 447 448 449 450 451 452
      ],
      // Horizontal offsets are currently one pixel off in places; vertical offsets are good.
      // The list is currently in the wrong order (so selection boxes will paint in the wrong order).
      skip: skipExpectsWithKnownBugs,
    );
  }, skip: skipTestsWithKnownBugs);

  test('TextPainter - multiple levels', () {
453
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
454 455 456
      ..textDirection = TextDirection.rtl;

    final String pyramid = rlo(lro(rlo(lro(rlo('')))));
457
    painter.text = TextSpan(
Ian Hickson's avatar
Ian Hickson committed
458 459 460 461 462 463
      text: pyramid,
      style: const TextStyle(fontFamily: 'Ahem', fontSize: 10.0),
    );
    painter.layout();

    expect(
464
      painter.getBoxesForSelection(TextSelection(baseOffset: 0, extentOffset: pyramid.length)),
Ian Hickson's avatar
Ian Hickson committed
465
      const <TextBox>[
466 467 468 469 470 471 472 473 474
        TextBox.fromLTRBD(90.0, 0.0, 100.0, 10.0, TextDirection.rtl), // outer R, start (right)
        TextBox.fromLTRBD(10.0, 0.0,  20.0, 10.0, TextDirection.ltr), // level 1 L, start (left)
        TextBox.fromLTRBD(70.0, 0.0,  80.0, 10.0, TextDirection.rtl), // level 2 R, start (right)
        TextBox.fromLTRBD(30.0, 0.0,  40.0, 10.0, TextDirection.ltr), // level 3 L, start (left)
        TextBox.fromLTRBD(40.0, 0.0,  60.0, 10.0, TextDirection.rtl), // inner-most RR
        TextBox.fromLTRBD(60.0, 0.0,  70.0, 10.0, TextDirection.ltr), // lever 3 L, end (right)
        TextBox.fromLTRBD(20.0, 0.0,  30.0, 10.0, TextDirection.rtl), // level 2 R, end (left)
        TextBox.fromLTRBD(80.0, 0.0,  90.0, 10.0, TextDirection.ltr), // level 1 L, end (right)
        TextBox.fromLTRBD( 0.0, 0.0,  10.0, 10.0, TextDirection.rtl), // outer R, end (left)
Ian Hickson's avatar
Ian Hickson committed
475 476 477 478 479 480 481 482 483
      ],
      // Horizontal offsets are currently one pixel off in places; vertical offsets are good.
      // The list is currently in the wrong order (so selection boxes will paint in the wrong order).
      // Also currently there's an extraneous box at the start of the list.
      skip: skipExpectsWithKnownBugs,
    );
  }, skip: skipTestsWithKnownBugs);

  test('TextPainter - getPositionForOffset - RTL in LTR', () {
484
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
485 486 487 488
      ..textDirection = TextDirection.ltr;

    painter.text = const TextSpan(
      text: 'ABC\u05D0\u05D1\u05D2DEF', // A B C Alef Bet Gimel D E F -- but the Hebrew letters are RTL
489
      style: TextStyle(fontFamily: 'Ahem', fontSize: 10.0),
Ian Hickson's avatar
Ian Hickson committed
490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565
    );
    painter.layout();

    // TODO(ianh): Remove the toString()s once https://github.com/flutter/engine/pull/4283 lands
    expect(
      //  Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      // ^
      painter.getPositionForOffset(const Offset(0.0, 5.0)).toString(),
      const TextPosition(offset: 0, affinity: TextAffinity.downstream).toString(),
    );
    expect(
      //                     Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      // ^
      painter.getPositionForOffset(const Offset(-100.0, 5.0)).toString(),
      const TextPosition(offset: 0, affinity: TextAffinity.downstream).toString(),
    );
    expect(
      //  Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      //  ^
      painter.getPositionForOffset(const Offset(4.0, 5.0)).toString(),
      const TextPosition(offset: 0, affinity: TextAffinity.downstream).toString(),
    );
    expect(
      //  Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      //    ^
      painter.getPositionForOffset(const Offset(8.0, 5.0)).toString(),
      const TextPosition(offset: 1, affinity: TextAffinity.upstream).toString(),
    );
    expect(
      //  Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      //       ^
      painter.getPositionForOffset(const Offset(12.0, 5.0)).toString(),
      const TextPosition(offset: 1, affinity: TextAffinity.downstream).toString(),
      skip: skipExpectsWithKnownBugs, // currently we say upstream instead of downstream
    );
    expect(
      //  Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      //              ^
      painter.getPositionForOffset(const Offset(28.0, 5.0)).toString(),
      const TextPosition(offset: 3, affinity: TextAffinity.upstream).toString(),
    );
    expect(
      //  Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      //                 ^
      painter.getPositionForOffset(const Offset(32.0, 5.0)).toString(),
      const TextPosition(offset: 6, affinity: TextAffinity.upstream).toString(),
      skip: skipExpectsWithKnownBugs, // this is part of https://github.com/flutter/flutter/issues/11375
    );
    expect(
      //  Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      //                                ^
      painter.getPositionForOffset(const Offset(58.0, 5.0)).toString(),
      const TextPosition(offset: 3, affinity: TextAffinity.downstream).toString(),
      skip: skipExpectsWithKnownBugs, // this is part of https://github.com/flutter/flutter/issues/11375
    );
    expect(
      //  Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      //                                   ^
      painter.getPositionForOffset(const Offset(62.0, 5.0)).toString(),
      const TextPosition(offset: 6, affinity: TextAffinity.downstream).toString(),
    );
    expect(
      //  Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      //                                               ^
      painter.getPositionForOffset(const Offset(88.0, 5.0)).toString(),
      const TextPosition(offset: 9, affinity: TextAffinity.upstream).toString(),
    );
    expect(
      //  Aaa  Bbb  Ccc  Gimel  Bet  Alef  Ddd  Eee  Fff
      //                                                     ^
      painter.getPositionForOffset(const Offset(100.0, 5.0)).toString(),
      const TextPosition(offset: 9, affinity: TextAffinity.upstream).toString(),
    );
  }, skip: skipTestsWithKnownBugs);

  test('TextPainter - getPositionForOffset - LTR in RTL', () {
566
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
567 568 569 570
      ..textDirection = TextDirection.rtl;

    painter.text = const TextSpan(
      text: '\u05D0\u05D1\u05D2ABC\u05D3\u05D4\u05D5',
571
      style: TextStyle(fontFamily: 'Ahem', fontSize: 10.0),
Ian Hickson's avatar
Ian Hickson committed
572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
    );
    painter.layout();

    // TODO(ianh): Remove the toString()s once https://github.com/flutter/engine/pull/4283 lands
    expect(
      //   Vav He Dalet Aaa Bbb Ccc Gimel Bet Alef
      // ^
      painter.getPositionForOffset(const Offset(-4.0, 5.0)).toString(),
      const TextPosition(offset: 9, affinity: TextAffinity.upstream).toString(),
    );
    expect(
      // Vav He Dalet Aaa Bbb Ccc Gimel Bet Alef
      //            ^
      painter.getPositionForOffset(const Offset(28.0, 5.0)).toString(),
      const TextPosition(offset: 6, affinity: TextAffinity.downstream).toString(),
    );
    expect(
      // Vav He Dalet Aaa Bbb Ccc Gimel Bet Alef
      //              ^
      painter.getPositionForOffset(const Offset(32.0, 5.0)).toString(),
      const TextPosition(offset: 3, affinity: TextAffinity.downstream).toString(),
      skip: skipExpectsWithKnownBugs, // this is part of https://github.com/flutter/flutter/issues/11375
    );
    expect(
      // Vav He Dalet Aaa Bbb Ccc Gimel Bet Alef
      //                        ^
      painter.getPositionForOffset(const Offset(58.0, 5.0)).toString(),
      const TextPosition(offset: 6, affinity: TextAffinity.upstream).toString(),
      skip: skipExpectsWithKnownBugs, // this is part of https://github.com/flutter/flutter/issues/11375
    );
    expect(
      // Vav He Dalet Aaa Bbb Ccc Gimel Bet Alef
      //                          ^
      painter.getPositionForOffset(const Offset(62.0, 5.0)).toString(),
      const TextPosition(offset: 3, affinity: TextAffinity.upstream).toString(),
    );
  }, skip: skipTestsWithKnownBugs);

  test('TextPainter - Spaces', () {
611
    final TextPainter painter = TextPainter()
Ian Hickson's avatar
Ian Hickson committed
612 613 614 615
      ..textDirection = TextDirection.ltr;

    painter.text = const TextSpan(
      text: ' ',
616 617 618
      style: TextStyle(fontFamily: 'Ahem', fontSize: 100.0),
      children: <TextSpan>[
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
619
          text: ' ',
620
          style: TextStyle(fontSize: 10.0),
Ian Hickson's avatar
Ian Hickson committed
621
        ),
622
        TextSpan(
Ian Hickson's avatar
Ian Hickson committed
623
          text: ' ',
624
          style: TextStyle(fontSize: 200.0),
Ian Hickson's avatar
Ian Hickson committed
625
        ),
626 627
        // Add a non-whitespace character because the renderer's line breaker
        // may strip trailing whitespace on a line.
628
        TextSpan(text: 'A'),
Ian Hickson's avatar
Ian Hickson committed
629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653
      ],
    );
    painter.layout();

    // This renders as three (invisible) boxes:
    //
    //                 |<--------200------->|
    //                  ____________________
    //                 |        ^           |
    //                 |        :           |
    //                 |        :           |
    //                 |        :           |
    //                 |        :           |
    //   ___________   |        : 160       |
    //  |  ^        |  |        :           |
    //  |<-+-100--->|10|        :           |
    //  |  :        |__|        :           |
    //  |  : 80     |  |8       :           |
    // _|__v________|__|________v___________| BASELINE
    //  |     ^20   |__|2       ^           |
    //  |_____v_____|  |        |           |
    //                 |        | 40        |
    //                 |        |           |
    //                 |________v___________|

654
    expect(painter.width, 410.0);
Ian Hickson's avatar
Ian Hickson committed
655 656 657 658 659
    expect(painter.height, 200.0);
    expect(painter.computeDistanceToActualBaseline(TextBaseline.alphabetic), 160.0);
    expect(painter.preferredLineHeight, 100.0);

    expect(
660
      painter.getBoxesForSelection(const TextSelection(baseOffset: 0, extentOffset: 3)),
Ian Hickson's avatar
Ian Hickson committed
661
      const <TextBox>[
662 663 664
        TextBox.fromLTRBD(  0.0,  80.0, 100.0, 180.0, TextDirection.ltr),
        TextBox.fromLTRBD(100.0, 152.0, 110.0, 162.0, TextDirection.ltr),
        TextBox.fromLTRBD(110.0,   0.0, 310.0, 200.0, TextDirection.ltr),
Ian Hickson's avatar
Ian Hickson committed
665 666 667 668 669
      ],
      // Horizontal offsets are currently one pixel off in places; vertical offsets are good.
      skip: skipExpectsWithKnownBugs,
    );
  }, skip: skipTestsWithKnownBugs);
670 671

  test('TextPainter - empty text baseline', () {
672
    final TextPainter painter = TextPainter()
673 674 675
      ..textDirection = TextDirection.ltr;
    painter.text = const TextSpan(
      text: '',
676
      style: TextStyle(fontFamily: 'Ahem', fontSize: 100.0, height: 1.0),
677 678 679 680 681 682 683 684
    );
    painter.layout();
    expect(
      // Returns -1
      painter.computeDistanceToActualBaseline(TextBaseline.alphabetic), 80.0,
      skip: skipExpectsWithKnownBugs,
    );
  }, skip: skipTestsWithKnownBugs);
Ian Hickson's avatar
Ian Hickson committed
685 686 687 688 689
}


String lro(String s) => '${Unicode.LRO}L${s}L${Unicode.PDF}';
String rlo(String s) => '${Unicode.RLO}R${s}R${Unicode.PDF}';