The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.text; |
| 18 | |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 19 | import android.annotation.TestApi; |
Mathew Inwood | efeab84 | 2018-08-14 15:21:30 +0100 | [diff] [blame] | 20 | import android.annotation.UnsupportedAppUsage; |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 21 | |
Jeff Sharkey | e982dfc1 | 2011-03-21 16:40:23 -0700 | [diff] [blame] | 22 | import java.text.BreakIterator; |
Jeff Sharkey | e982dfc1 | 2011-03-21 16:40:23 -0700 | [diff] [blame] | 23 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 24 | |
| 25 | /** |
| 26 | * Utility class for manipulating cursors and selections in CharSequences. |
| 27 | * A cursor is a selection where the start and end are at the same offset. |
| 28 | */ |
| 29 | public class Selection { |
| 30 | private Selection() { /* cannot be instantiated */ } |
| 31 | |
| 32 | /* |
| 33 | * Retrieving the selection |
| 34 | */ |
| 35 | |
| 36 | /** |
| 37 | * Return the offset of the selection anchor or cursor, or -1 if |
| 38 | * there is no selection or cursor. |
| 39 | */ |
| 40 | public static final int getSelectionStart(CharSequence text) { |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 41 | if (text instanceof Spanned) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 42 | return ((Spanned) text).getSpanStart(SELECTION_START); |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 43 | } |
| 44 | return -1; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 45 | } |
Jeff Sharkey | e982dfc1 | 2011-03-21 16:40:23 -0700 | [diff] [blame] | 46 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 47 | /** |
| 48 | * Return the offset of the selection edge or cursor, or -1 if |
| 49 | * there is no selection or cursor. |
| 50 | */ |
| 51 | public static final int getSelectionEnd(CharSequence text) { |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 52 | if (text instanceof Spanned) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 53 | return ((Spanned) text).getSpanStart(SELECTION_END); |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 54 | } |
| 55 | return -1; |
| 56 | } |
| 57 | |
| 58 | private static int getSelectionMemory(CharSequence text) { |
| 59 | if (text instanceof Spanned) { |
| 60 | return ((Spanned) text).getSpanStart(SELECTION_MEMORY); |
| 61 | } |
| 62 | return -1; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 63 | } |
| 64 | |
| 65 | /* |
| 66 | * Setting the selection |
| 67 | */ |
| 68 | |
| 69 | // private static int pin(int value, int min, int max) { |
| 70 | // return value < min ? 0 : (value > max ? max : value); |
| 71 | // } |
Jeff Sharkey | e982dfc1 | 2011-03-21 16:40:23 -0700 | [diff] [blame] | 72 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 73 | /** |
| 74 | * Set the selection anchor to <code>start</code> and the selection edge |
| 75 | * to <code>stop</code>. |
| 76 | */ |
| 77 | public static void setSelection(Spannable text, int start, int stop) { |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 78 | setSelection(text, start, stop, -1); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Set the selection anchor to <code>start</code>, the selection edge |
| 83 | * to <code>stop</code> and the memory horizontal to <code>memory</code>. |
| 84 | */ |
| 85 | private static void setSelection(Spannable text, int start, int stop, int memory) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 86 | // int len = text.length(); |
| 87 | // start = pin(start, 0, len); XXX remove unless we really need it |
| 88 | // stop = pin(stop, 0, len); |
| 89 | |
| 90 | int ostart = getSelectionStart(text); |
| 91 | int oend = getSelectionEnd(text); |
Jeff Sharkey | e982dfc1 | 2011-03-21 16:40:23 -0700 | [diff] [blame] | 92 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 93 | if (ostart != start || oend != stop) { |
| 94 | text.setSpan(SELECTION_START, start, start, |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 95 | Spanned.SPAN_POINT_POINT | Spanned.SPAN_INTERMEDIATE); |
| 96 | text.setSpan(SELECTION_END, stop, stop, Spanned.SPAN_POINT_POINT); |
| 97 | updateMemory(text, memory); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Update the memory position for text. This is used to ensure vertical navigation of lines |
| 103 | * with different lengths behaves as expected and remembers the longest horizontal position |
| 104 | * seen during a vertical traversal. |
| 105 | */ |
| 106 | private static void updateMemory(Spannable text, int memory) { |
| 107 | if (memory > -1) { |
| 108 | int currentMemory = getSelectionMemory(text); |
| 109 | if (memory != currentMemory) { |
| 110 | text.setSpan(SELECTION_MEMORY, memory, memory, Spanned.SPAN_POINT_POINT); |
| 111 | if (currentMemory == -1) { |
| 112 | // This is the first value, create a watcher. |
| 113 | final TextWatcher watcher = new MemoryTextWatcher(); |
| 114 | text.setSpan(watcher, 0, text.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE); |
| 115 | } |
| 116 | } |
| 117 | } else { |
| 118 | removeMemory(text); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | private static void removeMemory(Spannable text) { |
| 123 | text.removeSpan(SELECTION_MEMORY); |
| 124 | MemoryTextWatcher[] watchers = text.getSpans(0, text.length(), MemoryTextWatcher.class); |
| 125 | for (MemoryTextWatcher watcher : watchers) { |
| 126 | text.removeSpan(watcher); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * @hide |
| 132 | */ |
| 133 | @TestApi |
| 134 | public static final class MemoryTextWatcher implements TextWatcher { |
| 135 | |
| 136 | @Override |
| 137 | public void beforeTextChanged(CharSequence s, int start, int count, int after) {} |
| 138 | |
| 139 | @Override |
| 140 | public void onTextChanged(CharSequence s, int start, int before, int count) {} |
| 141 | |
| 142 | @Override |
| 143 | public void afterTextChanged(Editable s) { |
| 144 | s.removeSpan(SELECTION_MEMORY); |
| 145 | s.removeSpan(this); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 146 | } |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Move the cursor to offset <code>index</code>. |
| 151 | */ |
| 152 | public static final void setSelection(Spannable text, int index) { |
| 153 | setSelection(text, index, index); |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Select the entire text. |
| 158 | */ |
| 159 | public static final void selectAll(Spannable text) { |
| 160 | setSelection(text, 0, text.length()); |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Move the selection edge to offset <code>index</code>. |
| 165 | */ |
| 166 | public static final void extendSelection(Spannable text, int index) { |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 167 | extendSelection(text, index, -1); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Move the selection edge to offset <code>index</code> and update the memory horizontal. |
| 172 | */ |
| 173 | private static void extendSelection(Spannable text, int index, int memory) { |
| 174 | if (text.getSpanStart(SELECTION_END) != index) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 175 | text.setSpan(SELECTION_END, index, index, Spanned.SPAN_POINT_POINT); |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 176 | } |
| 177 | updateMemory(text, memory); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 178 | } |
| 179 | |
| 180 | /** |
| 181 | * Remove the selection or cursor, if any, from the text. |
| 182 | */ |
| 183 | public static final void removeSelection(Spannable text) { |
Clara Bayarri | 4e51877 | 2018-03-27 14:25:33 +0100 | [diff] [blame] | 184 | text.removeSpan(SELECTION_START, Spanned.SPAN_INTERMEDIATE); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 185 | text.removeSpan(SELECTION_END); |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 186 | removeMemory(text); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | /* |
| 190 | * Moving the selection within the layout |
| 191 | */ |
| 192 | |
| 193 | /** |
| 194 | * Move the cursor to the buffer offset physically above the current |
Raph Levien | fb0431b | 2014-09-04 15:03:14 -0700 | [diff] [blame] | 195 | * offset, to the beginning if it is on the top line but not at the |
| 196 | * start, or return false if the cursor is already on the top line. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 197 | */ |
| 198 | public static boolean moveUp(Spannable text, Layout layout) { |
| 199 | int start = getSelectionStart(text); |
| 200 | int end = getSelectionEnd(text); |
| 201 | |
| 202 | if (start != end) { |
| 203 | int min = Math.min(start, end); |
| 204 | int max = Math.max(start, end); |
| 205 | |
| 206 | setSelection(text, min); |
| 207 | |
| 208 | if (min == 0 && max == text.length()) { |
| 209 | return false; |
| 210 | } |
| 211 | |
| 212 | return true; |
| 213 | } else { |
| 214 | int line = layout.getLineForOffset(end); |
| 215 | |
| 216 | if (line > 0) { |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 217 | setSelectionAndMemory( |
| 218 | text, layout, line, end, -1 /* direction */, false /* extend */); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 219 | return true; |
Raph Levien | fb0431b | 2014-09-04 15:03:14 -0700 | [diff] [blame] | 220 | } else if (end != 0) { |
| 221 | setSelection(text, 0); |
| 222 | return true; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 223 | } |
| 224 | } |
| 225 | |
| 226 | return false; |
| 227 | } |
| 228 | |
| 229 | /** |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 230 | * Calculate the movement and memory positions needed, and set or extend the selection. |
| 231 | */ |
| 232 | private static void setSelectionAndMemory(Spannable text, Layout layout, int line, int end, |
| 233 | int direction, boolean extend) { |
| 234 | int move; |
| 235 | int newMemory; |
| 236 | |
| 237 | if (layout.getParagraphDirection(line) |
| 238 | == layout.getParagraphDirection(line + direction)) { |
| 239 | int memory = getSelectionMemory(text); |
| 240 | if (memory > -1) { |
| 241 | // We have a memory position |
| 242 | float h = layout.getPrimaryHorizontal(memory); |
| 243 | move = layout.getOffsetForHorizontal(line + direction, h); |
| 244 | newMemory = memory; |
| 245 | } else { |
| 246 | // Create a new memory position |
| 247 | float h = layout.getPrimaryHorizontal(end); |
| 248 | move = layout.getOffsetForHorizontal(line + direction, h); |
| 249 | newMemory = end; |
| 250 | } |
| 251 | } else { |
| 252 | move = layout.getLineStart(line + direction); |
| 253 | newMemory = -1; |
| 254 | } |
| 255 | |
| 256 | if (extend) { |
| 257 | extendSelection(text, move, newMemory); |
| 258 | } else { |
| 259 | setSelection(text, move, move, newMemory); |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 264 | * Move the cursor to the buffer offset physically below the current |
Raph Levien | fb0431b | 2014-09-04 15:03:14 -0700 | [diff] [blame] | 265 | * offset, to the end of the buffer if it is on the bottom line but |
| 266 | * not at the end, or return false if the cursor is already at the |
| 267 | * end of the buffer. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 268 | */ |
| 269 | public static boolean moveDown(Spannable text, Layout layout) { |
| 270 | int start = getSelectionStart(text); |
| 271 | int end = getSelectionEnd(text); |
| 272 | |
| 273 | if (start != end) { |
| 274 | int min = Math.min(start, end); |
| 275 | int max = Math.max(start, end); |
| 276 | |
| 277 | setSelection(text, max); |
| 278 | |
| 279 | if (min == 0 && max == text.length()) { |
| 280 | return false; |
| 281 | } |
| 282 | |
| 283 | return true; |
| 284 | } else { |
| 285 | int line = layout.getLineForOffset(end); |
| 286 | |
| 287 | if (line < layout.getLineCount() - 1) { |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 288 | setSelectionAndMemory( |
| 289 | text, layout, line, end, 1 /* direction */, false /* extend */); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 290 | return true; |
Raph Levien | fb0431b | 2014-09-04 15:03:14 -0700 | [diff] [blame] | 291 | } else if (end != text.length()) { |
| 292 | setSelection(text, text.length()); |
| 293 | return true; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 294 | } |
| 295 | } |
| 296 | |
| 297 | return false; |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * Move the cursor to the buffer offset physically to the left of |
| 302 | * the current offset, or return false if the cursor is already |
| 303 | * at the left edge of the line and there is not another line to move it to. |
| 304 | */ |
| 305 | public static boolean moveLeft(Spannable text, Layout layout) { |
| 306 | int start = getSelectionStart(text); |
| 307 | int end = getSelectionEnd(text); |
| 308 | |
| 309 | if (start != end) { |
| 310 | setSelection(text, chooseHorizontal(layout, -1, start, end)); |
| 311 | return true; |
| 312 | } else { |
| 313 | int to = layout.getOffsetToLeftOf(end); |
| 314 | |
| 315 | if (to != end) { |
| 316 | setSelection(text, to); |
| 317 | return true; |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | return false; |
| 322 | } |
| 323 | |
| 324 | /** |
| 325 | * Move the cursor to the buffer offset physically to the right of |
| 326 | * the current offset, or return false if the cursor is already at |
| 327 | * at the right edge of the line and there is not another line |
| 328 | * to move it to. |
| 329 | */ |
| 330 | public static boolean moveRight(Spannable text, Layout layout) { |
| 331 | int start = getSelectionStart(text); |
| 332 | int end = getSelectionEnd(text); |
| 333 | |
| 334 | if (start != end) { |
| 335 | setSelection(text, chooseHorizontal(layout, 1, start, end)); |
| 336 | return true; |
| 337 | } else { |
| 338 | int to = layout.getOffsetToRightOf(end); |
| 339 | |
| 340 | if (to != end) { |
| 341 | setSelection(text, to); |
| 342 | return true; |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | return false; |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * Move the selection end to the buffer offset physically above |
| 351 | * the current selection end. |
| 352 | */ |
| 353 | public static boolean extendUp(Spannable text, Layout layout) { |
| 354 | int end = getSelectionEnd(text); |
| 355 | int line = layout.getLineForOffset(end); |
| 356 | |
| 357 | if (line > 0) { |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 358 | setSelectionAndMemory(text, layout, line, end, -1 /* direction */, true /* extend */); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 359 | return true; |
| 360 | } else if (end != 0) { |
| 361 | extendSelection(text, 0); |
| 362 | return true; |
| 363 | } |
| 364 | |
| 365 | return true; |
| 366 | } |
| 367 | |
| 368 | /** |
| 369 | * Move the selection end to the buffer offset physically below |
| 370 | * the current selection end. |
| 371 | */ |
| 372 | public static boolean extendDown(Spannable text, Layout layout) { |
| 373 | int end = getSelectionEnd(text); |
| 374 | int line = layout.getLineForOffset(end); |
| 375 | |
| 376 | if (line < layout.getLineCount() - 1) { |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 377 | setSelectionAndMemory(text, layout, line, end, 1 /* direction */, true /* extend */); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 378 | return true; |
| 379 | } else if (end != text.length()) { |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 380 | extendSelection(text, text.length(), -1); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 381 | return true; |
| 382 | } |
| 383 | |
| 384 | return true; |
| 385 | } |
| 386 | |
| 387 | /** |
| 388 | * Move the selection end to the buffer offset physically to the left of |
| 389 | * the current selection end. |
| 390 | */ |
| 391 | public static boolean extendLeft(Spannable text, Layout layout) { |
| 392 | int end = getSelectionEnd(text); |
| 393 | int to = layout.getOffsetToLeftOf(end); |
| 394 | |
| 395 | if (to != end) { |
| 396 | extendSelection(text, to); |
| 397 | return true; |
| 398 | } |
| 399 | |
| 400 | return true; |
| 401 | } |
| 402 | |
| 403 | /** |
| 404 | * Move the selection end to the buffer offset physically to the right of |
| 405 | * the current selection end. |
| 406 | */ |
| 407 | public static boolean extendRight(Spannable text, Layout layout) { |
| 408 | int end = getSelectionEnd(text); |
| 409 | int to = layout.getOffsetToRightOf(end); |
| 410 | |
| 411 | if (to != end) { |
| 412 | extendSelection(text, to); |
| 413 | return true; |
| 414 | } |
| 415 | |
| 416 | return true; |
| 417 | } |
| 418 | |
| 419 | public static boolean extendToLeftEdge(Spannable text, Layout layout) { |
| 420 | int where = findEdge(text, layout, -1); |
| 421 | extendSelection(text, where); |
| 422 | return true; |
| 423 | } |
| 424 | |
| 425 | public static boolean extendToRightEdge(Spannable text, Layout layout) { |
| 426 | int where = findEdge(text, layout, 1); |
| 427 | extendSelection(text, where); |
| 428 | return true; |
| 429 | } |
| 430 | |
| 431 | public static boolean moveToLeftEdge(Spannable text, Layout layout) { |
| 432 | int where = findEdge(text, layout, -1); |
| 433 | setSelection(text, where); |
| 434 | return true; |
| 435 | } |
| 436 | |
| 437 | public static boolean moveToRightEdge(Spannable text, Layout layout) { |
| 438 | int where = findEdge(text, layout, 1); |
| 439 | setSelection(text, where); |
| 440 | return true; |
| 441 | } |
| 442 | |
Jeff Sharkey | e982dfc1 | 2011-03-21 16:40:23 -0700 | [diff] [blame] | 443 | /** {@hide} */ |
| 444 | public static interface PositionIterator { |
| 445 | public static final int DONE = BreakIterator.DONE; |
| 446 | |
| 447 | public int preceding(int position); |
| 448 | public int following(int position); |
| 449 | } |
| 450 | |
| 451 | /** {@hide} */ |
Mathew Inwood | efeab84 | 2018-08-14 15:21:30 +0100 | [diff] [blame] | 452 | @UnsupportedAppUsage |
Jeff Sharkey | e982dfc1 | 2011-03-21 16:40:23 -0700 | [diff] [blame] | 453 | public static boolean moveToPreceding( |
| 454 | Spannable text, PositionIterator iter, boolean extendSelection) { |
| 455 | final int offset = iter.preceding(getSelectionEnd(text)); |
| 456 | if (offset != PositionIterator.DONE) { |
| 457 | if (extendSelection) { |
| 458 | extendSelection(text, offset); |
| 459 | } else { |
| 460 | setSelection(text, offset); |
| 461 | } |
| 462 | } |
| 463 | return true; |
| 464 | } |
| 465 | |
| 466 | /** {@hide} */ |
Mathew Inwood | efeab84 | 2018-08-14 15:21:30 +0100 | [diff] [blame] | 467 | @UnsupportedAppUsage |
Jeff Sharkey | e982dfc1 | 2011-03-21 16:40:23 -0700 | [diff] [blame] | 468 | public static boolean moveToFollowing( |
| 469 | Spannable text, PositionIterator iter, boolean extendSelection) { |
| 470 | final int offset = iter.following(getSelectionEnd(text)); |
| 471 | if (offset != PositionIterator.DONE) { |
| 472 | if (extendSelection) { |
| 473 | extendSelection(text, offset); |
| 474 | } else { |
| 475 | setSelection(text, offset); |
| 476 | } |
| 477 | } |
| 478 | return true; |
| 479 | } |
| 480 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 481 | private static int findEdge(Spannable text, Layout layout, int dir) { |
| 482 | int pt = getSelectionEnd(text); |
| 483 | int line = layout.getLineForOffset(pt); |
| 484 | int pdir = layout.getParagraphDirection(line); |
| 485 | |
| 486 | if (dir * pdir < 0) { |
| 487 | return layout.getLineStart(line); |
| 488 | } else { |
| 489 | int end = layout.getLineEnd(line); |
| 490 | |
| 491 | if (line == layout.getLineCount() - 1) |
| 492 | return end; |
| 493 | else |
| 494 | return end - 1; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | private static int chooseHorizontal(Layout layout, int direction, |
| 499 | int off1, int off2) { |
| 500 | int line1 = layout.getLineForOffset(off1); |
| 501 | int line2 = layout.getLineForOffset(off2); |
| 502 | |
| 503 | if (line1 == line2) { |
| 504 | // same line, so it goes by pure physical direction |
| 505 | |
| 506 | float h1 = layout.getPrimaryHorizontal(off1); |
| 507 | float h2 = layout.getPrimaryHorizontal(off2); |
| 508 | |
| 509 | if (direction < 0) { |
| 510 | // to left |
| 511 | |
| 512 | if (h1 < h2) |
| 513 | return off1; |
| 514 | else |
| 515 | return off2; |
| 516 | } else { |
| 517 | // to right |
| 518 | |
| 519 | if (h1 > h2) |
| 520 | return off1; |
| 521 | else |
| 522 | return off2; |
| 523 | } |
| 524 | } else { |
| 525 | // different line, so which line is "left" and which is "right" |
| 526 | // depends upon the directionality of the text |
| 527 | |
| 528 | // This only checks at one end, but it's not clear what the |
| 529 | // right thing to do is if the ends don't agree. Even if it |
| 530 | // is wrong it should still not be too bad. |
| 531 | int line = layout.getLineForOffset(off1); |
| 532 | int textdir = layout.getParagraphDirection(line); |
| 533 | |
| 534 | if (textdir == direction) |
| 535 | return Math.max(off1, off2); |
| 536 | else |
| 537 | return Math.min(off1, off2); |
| 538 | } |
| 539 | } |
| 540 | |
Gilles Debunne | 2d0e87b | 2010-07-13 10:14:24 -0700 | [diff] [blame] | 541 | private static final class START implements NoCopySpan { } |
| 542 | private static final class END implements NoCopySpan { } |
Clara Bayarri | 6c66f86 | 2016-05-26 10:58:48 +0100 | [diff] [blame] | 543 | private static final class MEMORY implements NoCopySpan { } |
| 544 | private static final Object SELECTION_MEMORY = new MEMORY(); |
Jeff Sharkey | e982dfc1 | 2011-03-21 16:40:23 -0700 | [diff] [blame] | 545 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 546 | /* |
| 547 | * Public constants |
| 548 | */ |
| 549 | |
| 550 | public static final Object SELECTION_START = new START(); |
| 551 | public static final Object SELECTION_END = new END(); |
| 552 | } |