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| 1 /* | |
| 2 * Copyright (C) 2008 Nuanti Ltd. | |
| 3 * Copyright (C) 2009 Jan Alonzo | |
| 4 * Copyright (C) 2009, 2010, 2011, 2012 Igalia S.L. | |
| 5 * | |
| 6 * Portions from Mozilla a11y, copyright as follows: | |
| 7 * | |
| 8 * The Original Code is mozilla.org code. | |
| 9 * | |
| 10 * The Initial Developer of the Original Code is | |
| 11 * Sun Microsystems, Inc. | |
| 12 * Portions created by the Initial Developer are Copyright (C) 2002 | |
| 13 * the Initial Developer. All Rights Reserved. | |
| 14 * | |
| 15 * This library is free software; you can redistribute it and/or | |
| 16 * modify it under the terms of the GNU Library General Public | |
| 17 * License as published by the Free Software Foundation; either | |
| 18 * version 2 of the License, or (at your option) any later version. | |
| 19 * | |
| 20 * This library is distributed in the hope that it will be useful, | |
| 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 23 * Library General Public License for more details. | |
| 24 * | |
| 25 * You should have received a copy of the GNU Library General Public License | |
| 26 * along with this library; see the file COPYING.LIB. If not, write to | |
| 27 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
| 28 * Boston, MA 02110-1301, USA. | |
| 29 */ | |
| 30 | |
| 31 #include "config.h" | |
| 32 #include "WebKitAccessibleInterfaceText.h" | |
| 33 | |
| 34 #if HAVE(ACCESSIBILITY) | |
| 35 | |
| 36 #include "AccessibilityObject.h" | |
| 37 #include "Document.h" | |
| 38 #include "Font.h" | |
| 39 #include "FrameView.h" | |
| 40 #include "HostWindow.h" | |
| 41 #include "InlineTextBox.h" | |
| 42 #include "NotImplemented.h" | |
| 43 #include "RenderListItem.h" | |
| 44 #include "RenderListMarker.h" | |
| 45 #include "RenderText.h" | |
| 46 #include "TextEncoding.h" | |
| 47 #include "TextIterator.h" | |
| 48 #include "WebKitAccessibleUtil.h" | |
| 49 #include "WebKitAccessibleWrapperAtk.h" | |
| 50 #include "htmlediting.h" | |
| 51 #include <wtf/gobject/GOwnPtr.h> | |
| 52 | |
| 53 #if PLATFORM(GTK) | |
| 54 #include <libgail-util/gail-util.h> | |
| 55 #include <pango/pango.h> | |
| 56 #endif | |
| 57 | |
| 58 using namespace WebCore; | |
| 59 | |
| 60 static AccessibilityObject* core(AtkText* text) | |
| 61 { | |
| 62 if (!WEBKIT_IS_ACCESSIBLE(text)) | |
| 63 return 0; | |
| 64 | |
| 65 return webkitAccessibleGetAccessibilityObject(WEBKIT_ACCESSIBLE(text)); | |
| 66 } | |
| 67 | |
| 68 static gchar* textForRenderer(RenderObject* renderer) | |
| 69 { | |
| 70 GString* resultText = g_string_new(0); | |
| 71 | |
| 72 if (!renderer) | |
| 73 return g_string_free(resultText, FALSE); | |
| 74 | |
| 75 // For RenderBlocks, piece together the text from the RenderText objects the
y contain. | |
| 76 for (RenderObject* object = renderer->firstChild(); object; object = object-
>nextSibling()) { | |
| 77 if (object->isBR()) { | |
| 78 g_string_append(resultText, "\n"); | |
| 79 continue; | |
| 80 } | |
| 81 | |
| 82 RenderText* renderText; | |
| 83 if (object->isText()) | |
| 84 renderText = toRenderText(object); | |
| 85 else { | |
| 86 // List item's markers will be treated in an special way | |
| 87 // later on this function, so ignore them here. | |
| 88 if (object->isReplaced() && !object->isListMarker()) | |
| 89 g_string_append_unichar(resultText, objectReplacementCharacter); | |
| 90 | |
| 91 // We need to check children, if any, to consider when | |
| 92 // current object is not a text object but some of its | |
| 93 // children are, in order not to miss those portions of | |
| 94 // text by not properly handling those situations | |
| 95 if (object->firstChild()) | |
| 96 g_string_append(resultText, textForRenderer(object)); | |
| 97 | |
| 98 continue; | |
| 99 } | |
| 100 | |
| 101 InlineTextBox* box = renderText ? renderText->firstTextBox() : 0; | |
| 102 while (box) { | |
| 103 // WebCore introduces line breaks in the text that do not reflect | |
| 104 // the layout you see on the screen, replace them with spaces. | |
| 105 String text = String(renderText->characters(), renderText->textLengt
h()).replace("\n", " "); | |
| 106 g_string_append(resultText, text.substring(box->start(), box->end()
- box->start() + 1).utf8().data()); | |
| 107 | |
| 108 // Newline chars in the source result in separate text boxes, so che
ck | |
| 109 // before adding a newline in the layout. See bug 25415 comment #78. | |
| 110 // If the next sibling is a BR, we'll add the newline when we examin
e that child. | |
| 111 if (!box->nextOnLineExists() && !(object->nextSibling() && object->n
extSibling()->isBR())) { | |
| 112 // If there was a '\n' in the last position of the | |
| 113 // current text box, it would have been converted to a | |
| 114 // space in String::replace(), so remove it first. | |
| 115 if (renderText->characters()[box->end()] == '\n') | |
| 116 g_string_erase(resultText, resultText->len - 1, -1); | |
| 117 | |
| 118 g_string_append(resultText, "\n"); | |
| 119 } | |
| 120 box = box->nextTextBox(); | |
| 121 } | |
| 122 } | |
| 123 | |
| 124 // Insert the text of the marker for list item in the right place, if presen
t | |
| 125 if (renderer->isListItem()) { | |
| 126 String markerText = toRenderListItem(renderer)->markerTextWithSuffix(); | |
| 127 if (renderer->style()->direction() == LTR) | |
| 128 g_string_prepend(resultText, markerText.utf8().data()); | |
| 129 else | |
| 130 g_string_append(resultText, markerText.utf8().data()); | |
| 131 } | |
| 132 | |
| 133 return g_string_free(resultText, FALSE); | |
| 134 } | |
| 135 | |
| 136 static gchar* textForObject(AccessibilityObject* coreObject) | |
| 137 { | |
| 138 GString* str = g_string_new(0); | |
| 139 | |
| 140 // For text controls, we can get the text line by line. | |
| 141 if (coreObject->isTextControl()) { | |
| 142 unsigned textLength = coreObject->textLength(); | |
| 143 int lineNumber = 0; | |
| 144 PlainTextRange range = coreObject->doAXRangeForLine(lineNumber); | |
| 145 while (range.length) { | |
| 146 // When a line of text wraps in a text area, the final space is remo
ved. | |
| 147 if (range.start + range.length < textLength) | |
| 148 range.length -= 1; | |
| 149 String lineText = coreObject->doAXStringForRange(range); | |
| 150 g_string_append(str, lineText.utf8().data()); | |
| 151 g_string_append(str, "\n"); | |
| 152 range = coreObject->doAXRangeForLine(++lineNumber); | |
| 153 } | |
| 154 } else if (coreObject->isAccessibilityRenderObject()) { | |
| 155 GOwnPtr<gchar> rendererText(textForRenderer(coreObject->renderer())); | |
| 156 g_string_append(str, rendererText.get()); | |
| 157 } | |
| 158 | |
| 159 return g_string_free(str, FALSE); | |
| 160 } | |
| 161 | |
| 162 static gchar* webkitAccessibleTextGetText(AtkText*, gint startOffset, gint endOf
fset); | |
| 163 | |
| 164 #if PLATFORM(GTK) | |
| 165 static GailTextUtil* getGailTextUtilForAtk(AtkText* textObject) | |
| 166 { | |
| 167 GailTextUtil* gailTextUtil = gail_text_util_new(); | |
| 168 gail_text_util_text_setup(gailTextUtil, webkitAccessibleTextGetText(textObje
ct, 0, -1)); | |
| 169 return gailTextUtil; | |
| 170 } | |
| 171 | |
| 172 static PangoLayout* getPangoLayoutForAtk(AtkText* textObject) | |
| 173 { | |
| 174 AccessibilityObject* coreObject = core(textObject); | |
| 175 | |
| 176 Document* document = coreObject->document(); | |
| 177 if (!document) | |
| 178 return 0; | |
| 179 | |
| 180 HostWindow* hostWindow = document->view()->hostWindow(); | |
| 181 if (!hostWindow) | |
| 182 return 0; | |
| 183 PlatformPageClient webView = hostWindow->platformPageClient(); | |
| 184 if (!webView) | |
| 185 return 0; | |
| 186 | |
| 187 // Create a string with the layout as it appears on the screen | |
| 188 PangoLayout* layout = gtk_widget_create_pango_layout(static_cast<GtkWidget*>
(webView), textForObject(coreObject)); | |
| 189 return layout; | |
| 190 } | |
| 191 #endif | |
| 192 | |
| 193 static int baselinePositionForRenderObject(RenderObject* renderObject) | |
| 194 { | |
| 195 // FIXME: This implementation of baselinePosition originates from RenderObje
ct.cpp and was | |
| 196 // removed in r70072. The implementation looks incorrect though, because thi
s is not the | |
| 197 // baseline of the underlying RenderObject, but of the AccessibilityRenderOb
ject. | |
| 198 const FontMetrics& fontMetrics = renderObject->firstLineStyle()->fontMetrics
(); | |
| 199 return fontMetrics.ascent() + (renderObject->firstLineStyle()->computedLineH
eight() - fontMetrics.height()) / 2; | |
| 200 } | |
| 201 | |
| 202 static AtkAttributeSet* getAttributeSetForAccessibilityObject(const Accessibilit
yObject* object) | |
| 203 { | |
| 204 if (!object->isAccessibilityRenderObject()) | |
| 205 return 0; | |
| 206 | |
| 207 RenderObject* renderer = object->renderer(); | |
| 208 RenderStyle* style = renderer->style(); | |
| 209 | |
| 210 AtkAttributeSet* result = 0; | |
| 211 GOwnPtr<gchar> buffer(g_strdup_printf("%i", style->fontSize())); | |
| 212 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TEXT_A
TTR_SIZE), buffer.get()); | |
| 213 | |
| 214 Color bgColor = style->visitedDependentColor(CSSPropertyBackgroundColor); | |
| 215 if (bgColor.isValid()) { | |
| 216 buffer.set(g_strdup_printf("%i,%i,%i", bgColor.red(), bgColor.green(), b
gColor.blue())); | |
| 217 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TE
XT_ATTR_BG_COLOR), buffer.get()); | |
| 218 } | |
| 219 | |
| 220 Color fgColor = style->visitedDependentColor(CSSPropertyColor); | |
| 221 if (fgColor.isValid()) { | |
| 222 buffer.set(g_strdup_printf("%i,%i,%i", fgColor.red(), fgColor.green(), f
gColor.blue())); | |
| 223 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TE
XT_ATTR_FG_COLOR), buffer.get()); | |
| 224 } | |
| 225 | |
| 226 int baselinePosition; | |
| 227 bool includeRise = true; | |
| 228 switch (style->verticalAlign()) { | |
| 229 case SUB: | |
| 230 baselinePosition = -1 * baselinePositionForRenderObject(renderer); | |
| 231 break; | |
| 232 case SUPER: | |
| 233 baselinePosition = baselinePositionForRenderObject(renderer); | |
| 234 break; | |
| 235 case BASELINE: | |
| 236 baselinePosition = 0; | |
| 237 break; | |
| 238 default: | |
| 239 includeRise = false; | |
| 240 break; | |
| 241 } | |
| 242 | |
| 243 if (includeRise) { | |
| 244 buffer.set(g_strdup_printf("%i", baselinePosition)); | |
| 245 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TE
XT_ATTR_RISE), buffer.get()); | |
| 246 } | |
| 247 | |
| 248 if (!style->textIndent().isUndefined()) { | |
| 249 int indentation = valueForLength(style->textIndent(), object->size().wid
th(), renderer->view()); | |
| 250 buffer.set(g_strdup_printf("%i", indentation)); | |
| 251 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TE
XT_ATTR_INDENT), buffer.get()); | |
| 252 } | |
| 253 | |
| 254 String fontFamilyName = style->font().family().family().string(); | |
| 255 if (fontFamilyName.left(8) == "-webkit-") | |
| 256 fontFamilyName = fontFamilyName.substring(8); | |
| 257 | |
| 258 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TEXT_A
TTR_FAMILY_NAME), fontFamilyName.utf8().data()); | |
| 259 | |
| 260 int fontWeight = -1; | |
| 261 switch (style->font().weight()) { | |
| 262 case FontWeight100: | |
| 263 fontWeight = 100; | |
| 264 break; | |
| 265 case FontWeight200: | |
| 266 fontWeight = 200; | |
| 267 break; | |
| 268 case FontWeight300: | |
| 269 fontWeight = 300; | |
| 270 break; | |
| 271 case FontWeight400: | |
| 272 fontWeight = 400; | |
| 273 break; | |
| 274 case FontWeight500: | |
| 275 fontWeight = 500; | |
| 276 break; | |
| 277 case FontWeight600: | |
| 278 fontWeight = 600; | |
| 279 break; | |
| 280 case FontWeight700: | |
| 281 fontWeight = 700; | |
| 282 break; | |
| 283 case FontWeight800: | |
| 284 fontWeight = 800; | |
| 285 break; | |
| 286 case FontWeight900: | |
| 287 fontWeight = 900; | |
| 288 } | |
| 289 if (fontWeight > 0) { | |
| 290 buffer.set(g_strdup_printf("%i", fontWeight)); | |
| 291 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TE
XT_ATTR_WEIGHT), buffer.get()); | |
| 292 } | |
| 293 | |
| 294 switch (style->textAlign()) { | |
| 295 case TASTART: | |
| 296 case TAEND: | |
| 297 break; | |
| 298 case LEFT: | |
| 299 case WEBKIT_LEFT: | |
| 300 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TE
XT_ATTR_JUSTIFICATION), "left"); | |
| 301 break; | |
| 302 case RIGHT: | |
| 303 case WEBKIT_RIGHT: | |
| 304 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TE
XT_ATTR_JUSTIFICATION), "right"); | |
| 305 break; | |
| 306 case CENTER: | |
| 307 case WEBKIT_CENTER: | |
| 308 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TE
XT_ATTR_JUSTIFICATION), "center"); | |
| 309 break; | |
| 310 case JUSTIFY: | |
| 311 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TE
XT_ATTR_JUSTIFICATION), "fill"); | |
| 312 } | |
| 313 | |
| 314 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TEXT_A
TTR_UNDERLINE), (style->textDecoration() & UNDERLINE) ? "single" : "none"); | |
| 315 | |
| 316 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TEXT_A
TTR_STYLE), style->font().italic() ? "italic" : "normal"); | |
| 317 | |
| 318 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TEXT_A
TTR_STRIKETHROUGH), (style->textDecoration() & LINE_THROUGH) ? "true" : "false")
; | |
| 319 | |
| 320 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TEXT_A
TTR_INVISIBLE), (style->visibility() == HIDDEN) ? "true" : "false"); | |
| 321 | |
| 322 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TEXT_A
TTR_EDITABLE), object->isReadOnly() ? "false" : "true"); | |
| 323 | |
| 324 String language = object->language(); | |
| 325 if (!language.isEmpty()) | |
| 326 result = addToAtkAttributeSet(result, atk_text_attribute_get_name(ATK_TE
XT_ATTR_LANGUAGE), language.utf8().data()); | |
| 327 | |
| 328 return result; | |
| 329 } | |
| 330 | |
| 331 static gint compareAttribute(const AtkAttribute* a, const AtkAttribute* b) | |
| 332 { | |
| 333 return g_strcmp0(a->name, b->name) || g_strcmp0(a->value, b->value); | |
| 334 } | |
| 335 | |
| 336 // Returns an AtkAttributeSet with the elements of attributeSet1 which | |
| 337 // are either not present or different in attributeSet2. Neither | |
| 338 // attributeSet1 nor attributeSet2 should be used after calling this. | |
| 339 static AtkAttributeSet* attributeSetDifference(AtkAttributeSet* attributeSet1, A
tkAttributeSet* attributeSet2) | |
| 340 { | |
| 341 if (!attributeSet2) | |
| 342 return attributeSet1; | |
| 343 | |
| 344 AtkAttributeSet* currentSet = attributeSet1; | |
| 345 AtkAttributeSet* found; | |
| 346 AtkAttributeSet* toDelete = 0; | |
| 347 | |
| 348 while (currentSet) { | |
| 349 found = g_slist_find_custom(attributeSet2, currentSet->data, (GCompareFu
nc)compareAttribute); | |
| 350 if (found) { | |
| 351 AtkAttributeSet* nextSet = currentSet->next; | |
| 352 toDelete = g_slist_prepend(toDelete, currentSet->data); | |
| 353 attributeSet1 = g_slist_delete_link(attributeSet1, currentSet); | |
| 354 currentSet = nextSet; | |
| 355 } else | |
| 356 currentSet = currentSet->next; | |
| 357 } | |
| 358 | |
| 359 atk_attribute_set_free(attributeSet2); | |
| 360 atk_attribute_set_free(toDelete); | |
| 361 return attributeSet1; | |
| 362 } | |
| 363 | |
| 364 static guint accessibilityObjectLength(const AccessibilityObject* object) | |
| 365 { | |
| 366 // Non render objects are not taken into account | |
| 367 if (!object->isAccessibilityRenderObject()) | |
| 368 return 0; | |
| 369 | |
| 370 // For those objects implementing the AtkText interface we use the | |
| 371 // well known API to always get the text in a consistent way | |
| 372 AtkObject* atkObj = ATK_OBJECT(object->wrapper()); | |
| 373 if (ATK_IS_TEXT(atkObj)) { | |
| 374 GOwnPtr<gchar> text(webkitAccessibleTextGetText(ATK_TEXT(atkObj), 0, -1)
); | |
| 375 return g_utf8_strlen(text.get(), -1); | |
| 376 } | |
| 377 | |
| 378 // Even if we don't expose list markers to Assistive | |
| 379 // Technologies, we need to have a way to measure their length | |
| 380 // for those cases when it's needed to take it into account | |
| 381 // separately (as in getAccessibilityObjectForOffset) | |
| 382 RenderObject* renderer = object->renderer(); | |
| 383 if (renderer && renderer->isListMarker()) { | |
| 384 RenderListMarker* marker = toRenderListMarker(renderer); | |
| 385 return marker->text().length() + marker->suffix().length(); | |
| 386 } | |
| 387 | |
| 388 return 0; | |
| 389 } | |
| 390 | |
| 391 static const AccessibilityObject* getAccessibilityObjectForOffset(const Accessib
ilityObject* object, guint offset, gint* startOffset, gint* endOffset) | |
| 392 { | |
| 393 const AccessibilityObject* result; | |
| 394 guint length = accessibilityObjectLength(object); | |
| 395 if (length > offset) { | |
| 396 *startOffset = 0; | |
| 397 *endOffset = length; | |
| 398 result = object; | |
| 399 } else { | |
| 400 *startOffset = -1; | |
| 401 *endOffset = -1; | |
| 402 result = 0; | |
| 403 } | |
| 404 | |
| 405 if (!object->firstChild()) | |
| 406 return result; | |
| 407 | |
| 408 AccessibilityObject* child = object->firstChild(); | |
| 409 guint currentOffset = 0; | |
| 410 guint childPosition = 0; | |
| 411 while (child && currentOffset <= offset) { | |
| 412 guint childLength = accessibilityObjectLength(child); | |
| 413 currentOffset = childLength + childPosition; | |
| 414 if (currentOffset > offset) { | |
| 415 gint childStartOffset; | |
| 416 gint childEndOffset; | |
| 417 const AccessibilityObject* grandChild = getAccessibilityObjectForOff
set(child, offset-childPosition, &childStartOffset, &childEndOffset); | |
| 418 if (childStartOffset >= 0) { | |
| 419 *startOffset = childStartOffset + childPosition; | |
| 420 *endOffset = childEndOffset + childPosition; | |
| 421 result = grandChild; | |
| 422 } | |
| 423 } else { | |
| 424 childPosition += childLength; | |
| 425 child = child->nextSibling(); | |
| 426 } | |
| 427 } | |
| 428 return result; | |
| 429 } | |
| 430 | |
| 431 static AtkAttributeSet* getRunAttributesFromAccesibilityObject(const Accessibili
tyObject* element, gint offset, gint* startOffset, gint* endOffset) | |
| 432 { | |
| 433 const AccessibilityObject* child = getAccessibilityObjectForOffset(element,
offset, startOffset, endOffset); | |
| 434 if (!child) { | |
| 435 *startOffset = -1; | |
| 436 *endOffset = -1; | |
| 437 return 0; | |
| 438 } | |
| 439 | |
| 440 AtkAttributeSet* defaultAttributes = getAttributeSetForAccessibilityObject(e
lement); | |
| 441 AtkAttributeSet* childAttributes = getAttributeSetForAccessibilityObject(chi
ld); | |
| 442 | |
| 443 return attributeSetDifference(childAttributes, defaultAttributes); | |
| 444 } | |
| 445 | |
| 446 static IntRect textExtents(AtkText* text, gint startOffset, gint length, AtkCoor
dType coords) | |
| 447 { | |
| 448 gchar* textContent = webkitAccessibleTextGetText(text, startOffset, -1); | |
| 449 gint textLength = g_utf8_strlen(textContent, -1); | |
| 450 | |
| 451 // The first case (endOffset of -1) should work, but seems broken for all Gt
k+ apps. | |
| 452 gint rangeLength = length; | |
| 453 if (rangeLength < 0 || rangeLength > textLength) | |
| 454 rangeLength = textLength; | |
| 455 AccessibilityObject* coreObject = core(text); | |
| 456 | |
| 457 IntRect extents = coreObject->doAXBoundsForRange(PlainTextRange(startOffset,
rangeLength)); | |
| 458 switch (coords) { | |
| 459 case ATK_XY_SCREEN: | |
| 460 if (Document* document = coreObject->document()) | |
| 461 extents = document->view()->contentsToScreen(extents); | |
| 462 break; | |
| 463 case ATK_XY_WINDOW: | |
| 464 // No-op | |
| 465 break; | |
| 466 } | |
| 467 | |
| 468 return extents; | |
| 469 } | |
| 470 | |
| 471 static void getSelectionOffsetsForObject(AccessibilityObject* coreObject, Visibl
eSelection& selection, gint& startOffset, gint& endOffset) | |
| 472 { | |
| 473 if (!coreObject->isAccessibilityRenderObject()) | |
| 474 return; | |
| 475 | |
| 476 // Early return if the selection doesn't affect the selected node. | |
| 477 if (!selectionBelongsToObject(coreObject, selection)) | |
| 478 return; | |
| 479 | |
| 480 // We need to find the exact start and end positions in the | |
| 481 // selected node that intersects the selection, to later on get | |
| 482 // the right values for the effective start and end offsets. | |
| 483 Position nodeRangeStart; | |
| 484 Position nodeRangeEnd; | |
| 485 Node* node = coreObject->node(); | |
| 486 RefPtr<Range> selRange = selection.toNormalizedRange(); | |
| 487 | |
| 488 // If the selection affects the selected node and its first | |
| 489 // possible position is also in the selection, we must set | |
| 490 // nodeRangeStart to that position, otherwise to the selection's | |
| 491 // start position (it would belong to the node anyway). | |
| 492 Node* firstLeafNode = node->firstDescendant(); | |
| 493 if (selRange->isPointInRange(firstLeafNode, 0, IGNORE_EXCEPTION)) | |
| 494 nodeRangeStart = firstPositionInOrBeforeNode(firstLeafNode); | |
| 495 else | |
| 496 nodeRangeStart = selRange->startPosition(); | |
| 497 | |
| 498 // If the selection affects the selected node and its last | |
| 499 // possible position is also in the selection, we must set | |
| 500 // nodeRangeEnd to that position, otherwise to the selection's | |
| 501 // end position (it would belong to the node anyway). | |
| 502 Node* lastLeafNode = node->lastDescendant(); | |
| 503 if (selRange->isPointInRange(lastLeafNode, lastOffsetInNode(lastLeafNode), I
GNORE_EXCEPTION)) | |
| 504 nodeRangeEnd = lastPositionInOrAfterNode(lastLeafNode); | |
| 505 else | |
| 506 nodeRangeEnd = selRange->endPosition(); | |
| 507 | |
| 508 // Calculate position of the selected range inside the object. | |
| 509 Position parentFirstPosition = firstPositionInOrBeforeNode(node); | |
| 510 RefPtr<Range> rangeInParent = Range::create(node->document(), parentFirstPos
ition, nodeRangeStart); | |
| 511 | |
| 512 // Set values for start and end offsets. | |
| 513 startOffset = TextIterator::rangeLength(rangeInParent.get(), true); | |
| 514 | |
| 515 // We need to adjust the offsets for the list item marker. | |
| 516 RenderObject* renderer = coreObject->renderer(); | |
| 517 if (renderer && renderer->isListItem()) { | |
| 518 String markerText = toRenderListItem(renderer)->markerTextWithSuffix(); | |
| 519 startOffset += markerText.length(); | |
| 520 } | |
| 521 | |
| 522 RefPtr<Range> nodeRange = Range::create(node->document(), nodeRangeStart, no
deRangeEnd); | |
| 523 endOffset = startOffset + TextIterator::rangeLength(nodeRange.get(), true); | |
| 524 } | |
| 525 | |
| 526 static gchar* webkitAccessibleTextGetText(AtkText* text, gint startOffset, gint
endOffset) | |
| 527 { | |
| 528 AccessibilityObject* coreObject = core(text); | |
| 529 | |
| 530 int end = endOffset; | |
| 531 if (endOffset == -1) { | |
| 532 end = coreObject->stringValue().length(); | |
| 533 if (!end) | |
| 534 end = coreObject->textUnderElement().length(); | |
| 535 } | |
| 536 | |
| 537 String ret; | |
| 538 if (coreObject->isTextControl()) | |
| 539 ret = coreObject->doAXStringForRange(PlainTextRange(0, endOffset)); | |
| 540 else { | |
| 541 ret = coreObject->stringValue(); | |
| 542 if (!ret) | |
| 543 ret = coreObject->textUnderElement(); | |
| 544 } | |
| 545 | |
| 546 if (!ret.length()) { | |
| 547 // This can happen at least with anonymous RenderBlocks (e.g. body text
amongst paragraphs) | |
| 548 // In such instances, there may also be embedded objects. The object rep
lacement character | |
| 549 // is something ATs want included and we have to account for the fact th
at it is multibyte. | |
| 550 ret = String::fromUTF8(textForObject(coreObject)); | |
| 551 if (!end) | |
| 552 end = ret.length(); | |
| 553 } | |
| 554 | |
| 555 // Prefix a item number/bullet if needed | |
| 556 if (coreObject->roleValue() == ListItemRole) { | |
| 557 RenderObject* objRenderer = coreObject->renderer(); | |
| 558 if (objRenderer && objRenderer->isListItem()) { | |
| 559 String markerText = toRenderListItem(objRenderer)->markerTextWithSuf
fix(); | |
| 560 ret = objRenderer->style()->direction() == LTR ? markerText + ret :
ret + markerText; | |
| 561 if (endOffset == -1) | |
| 562 end += markerText.length(); | |
| 563 } | |
| 564 } | |
| 565 | |
| 566 ret = ret.substring(startOffset, end - startOffset); | |
| 567 return g_strdup(ret.utf8().data()); | |
| 568 } | |
| 569 | |
| 570 static gchar* webkitAccessibleTextGetTextAfterOffset(AtkText* text, gint offset,
AtkTextBoundary boundaryType, gint* startOffset, gint* endOffset) | |
| 571 { | |
| 572 #if PLATFORM(GTK) | |
| 573 return gail_text_util_get_text(getGailTextUtilForAtk(text), getPangoLayoutFo
rAtk(text), GAIL_AFTER_OFFSET, boundaryType, offset, startOffset, endOffset); | |
| 574 #else | |
| 575 UNUSED_PARAM(text); | |
| 576 UNUSED_PARAM(offset); | |
| 577 UNUSED_PARAM(boundaryType); | |
| 578 UNUSED_PARAM(startOffset); | |
| 579 UNUSED_PARAM(endOffset); | |
| 580 | |
| 581 notImplemented(); | |
| 582 return 0; | |
| 583 #endif | |
| 584 } | |
| 585 | |
| 586 static gchar* webkitAccessibleTextGetTextAtOffset(AtkText* text, gint offset, At
kTextBoundary boundaryType, gint* startOffset, gint* endOffset) | |
| 587 { | |
| 588 #if PLATFORM(GTK) | |
| 589 return gail_text_util_get_text(getGailTextUtilForAtk(text), getPangoLayoutFo
rAtk(text), GAIL_AT_OFFSET, boundaryType, offset, startOffset, endOffset); | |
| 590 #else | |
| 591 UNUSED_PARAM(text); | |
| 592 UNUSED_PARAM(offset); | |
| 593 UNUSED_PARAM(boundaryType); | |
| 594 UNUSED_PARAM(startOffset); | |
| 595 UNUSED_PARAM(endOffset); | |
| 596 | |
| 597 notImplemented(); | |
| 598 return 0; | |
| 599 #endif | |
| 600 } | |
| 601 | |
| 602 static gchar* webkitAccessibleTextGetTextBeforeOffset(AtkText* text, gint offset
, AtkTextBoundary boundaryType, gint* startOffset, gint* endOffset) | |
| 603 { | |
| 604 #if PLATFORM(GTK) | |
| 605 return gail_text_util_get_text(getGailTextUtilForAtk(text), getPangoLayoutFo
rAtk(text), GAIL_BEFORE_OFFSET, boundaryType, offset, startOffset, endOffset); | |
| 606 #else | |
| 607 UNUSED_PARAM(text); | |
| 608 UNUSED_PARAM(offset); | |
| 609 UNUSED_PARAM(boundaryType); | |
| 610 UNUSED_PARAM(startOffset); | |
| 611 UNUSED_PARAM(endOffset); | |
| 612 | |
| 613 notImplemented(); | |
| 614 return 0; | |
| 615 #endif | |
| 616 } | |
| 617 | |
| 618 static gunichar webkitAccessibleTextGetCharacterAtOffset(AtkText*, gint) | |
| 619 { | |
| 620 notImplemented(); | |
| 621 return 0; | |
| 622 } | |
| 623 | |
| 624 static gint webkitAccessibleTextGetCaretOffset(AtkText* text) | |
| 625 { | |
| 626 // coreObject is the unignored object whose offset the caller is requesting. | |
| 627 // focusedObject is the object with the caret. It is likely ignored -- unles
s it's a link. | |
| 628 AccessibilityObject* coreObject = core(text); | |
| 629 if (!coreObject->isAccessibilityRenderObject()) | |
| 630 return 0; | |
| 631 | |
| 632 // We need to make sure we pass a valid object as reference. | |
| 633 if (coreObject->accessibilityIsIgnored()) | |
| 634 coreObject = coreObject->parentObjectUnignored(); | |
| 635 if (!coreObject) | |
| 636 return 0; | |
| 637 | |
| 638 int offset; | |
| 639 if (!objectFocusedAndCaretOffsetUnignored(coreObject, offset)) | |
| 640 return 0; | |
| 641 | |
| 642 RenderObject* renderer = coreObject->renderer(); | |
| 643 if (renderer && renderer->isListItem()) { | |
| 644 String markerText = toRenderListItem(renderer)->markerTextWithSuffix(); | |
| 645 | |
| 646 // We need to adjust the offset for the list item marker. | |
| 647 offset += markerText.length(); | |
| 648 } | |
| 649 | |
| 650 // TODO: Verify this for RTL text. | |
| 651 return offset; | |
| 652 } | |
| 653 | |
| 654 static AtkAttributeSet* webkitAccessibleTextGetRunAttributes(AtkText* text, gint
offset, gint* startOffset, gint* endOffset) | |
| 655 { | |
| 656 AccessibilityObject* coreObject = core(text); | |
| 657 AtkAttributeSet* result; | |
| 658 | |
| 659 if (!coreObject) { | |
| 660 *startOffset = 0; | |
| 661 *endOffset = atk_text_get_character_count(text); | |
| 662 return 0; | |
| 663 } | |
| 664 | |
| 665 if (offset == -1) | |
| 666 offset = atk_text_get_caret_offset(text); | |
| 667 | |
| 668 result = getRunAttributesFromAccesibilityObject(coreObject, offset, startOff
set, endOffset); | |
| 669 | |
| 670 if (*startOffset < 0) { | |
| 671 *startOffset = offset; | |
| 672 *endOffset = offset; | |
| 673 } | |
| 674 | |
| 675 return result; | |
| 676 } | |
| 677 | |
| 678 static AtkAttributeSet* webkitAccessibleTextGetDefaultAttributes(AtkText* text) | |
| 679 { | |
| 680 AccessibilityObject* coreObject = core(text); | |
| 681 if (!coreObject || !coreObject->isAccessibilityRenderObject()) | |
| 682 return 0; | |
| 683 | |
| 684 return getAttributeSetForAccessibilityObject(coreObject); | |
| 685 } | |
| 686 | |
| 687 static void webkitAccessibleTextGetCharacterExtents(AtkText* text, gint offset,
gint* x, gint* y, gint* width, gint* height, AtkCoordType coords) | |
| 688 { | |
| 689 IntRect extents = textExtents(text, offset, 1, coords); | |
| 690 *x = extents.x(); | |
| 691 *y = extents.y(); | |
| 692 *width = extents.width(); | |
| 693 *height = extents.height(); | |
| 694 } | |
| 695 | |
| 696 static void webkitAccessibleTextGetRangeExtents(AtkText* text, gint startOffset,
gint endOffset, AtkCoordType coords, AtkTextRectangle* rect) | |
| 697 { | |
| 698 IntRect extents = textExtents(text, startOffset, endOffset - startOffset, co
ords); | |
| 699 rect->x = extents.x(); | |
| 700 rect->y = extents.y(); | |
| 701 rect->width = extents.width(); | |
| 702 rect->height = extents.height(); | |
| 703 } | |
| 704 | |
| 705 static gint webkitAccessibleTextGetCharacterCount(AtkText* text) | |
| 706 { | |
| 707 return accessibilityObjectLength(core(text)); | |
| 708 } | |
| 709 | |
| 710 static gint webkitAccessibleTextGetOffsetAtPoint(AtkText* text, gint x, gint y,
AtkCoordType) | |
| 711 { | |
| 712 // FIXME: Use the AtkCoordType | |
| 713 // TODO: Is it correct to ignore range.length? | |
| 714 IntPoint pos(x, y); | |
| 715 PlainTextRange range = core(text)->doAXRangeForPosition(pos); | |
| 716 return range.start; | |
| 717 } | |
| 718 | |
| 719 static gint webkitAccessibleTextGetNSelections(AtkText* text) | |
| 720 { | |
| 721 AccessibilityObject* coreObject = core(text); | |
| 722 VisibleSelection selection = coreObject->selection(); | |
| 723 | |
| 724 // Only range selections are needed for the purpose of this method | |
| 725 if (!selection.isRange()) | |
| 726 return 0; | |
| 727 | |
| 728 // We don't support multiple selections for now, so there's only | |
| 729 // two possibilities | |
| 730 // Also, we don't want to do anything if the selection does not | |
| 731 // belong to the currently selected object. We have to check since | |
| 732 // there's no way to get the selection for a given object, only | |
| 733 // the global one (the API is a bit confusing) | |
| 734 return selectionBelongsToObject(coreObject, selection) ? 1 : 0; | |
| 735 } | |
| 736 | |
| 737 static gchar* webkitAccessibleTextGetSelection(AtkText* text, gint selectionNum,
gint* startOffset, gint* endOffset) | |
| 738 { | |
| 739 // Default values, unless the contrary is proved | |
| 740 *startOffset = *endOffset = 0; | |
| 741 | |
| 742 // WebCore does not support multiple selection, so anything but 0 does not m
ake sense for now. | |
| 743 if (selectionNum) | |
| 744 return 0; | |
| 745 | |
| 746 // Get the offsets of the selection for the selected object | |
| 747 AccessibilityObject* coreObject = core(text); | |
| 748 VisibleSelection selection = coreObject->selection(); | |
| 749 getSelectionOffsetsForObject(coreObject, selection, *startOffset, *endOffset
); | |
| 750 | |
| 751 // Return 0 instead of "", as that's the expected result for | |
| 752 // this AtkText method when there's no selection | |
| 753 if (*startOffset == *endOffset) | |
| 754 return 0; | |
| 755 | |
| 756 return webkitAccessibleTextGetText(text, *startOffset, *endOffset); | |
| 757 } | |
| 758 | |
| 759 static gboolean webkitAccessibleTextAddSelection(AtkText*, gint, gint) | |
| 760 { | |
| 761 notImplemented(); | |
| 762 return FALSE; | |
| 763 } | |
| 764 | |
| 765 static gboolean webkitAccessibleTextSetSelection(AtkText* text, gint selectionNu
m, gint startOffset, gint endOffset) | |
| 766 { | |
| 767 // WebCore does not support multiple selection, so anything but 0 does not m
ake sense for now. | |
| 768 if (selectionNum) | |
| 769 return FALSE; | |
| 770 | |
| 771 AccessibilityObject* coreObject = core(text); | |
| 772 if (!coreObject->isAccessibilityRenderObject()) | |
| 773 return FALSE; | |
| 774 | |
| 775 // Consider -1 and out-of-bound values and correct them to length | |
| 776 gint textCount = webkitAccessibleTextGetCharacterCount(text); | |
| 777 if (startOffset < 0 || startOffset > textCount) | |
| 778 startOffset = textCount; | |
| 779 if (endOffset < 0 || endOffset > textCount) | |
| 780 endOffset = textCount; | |
| 781 | |
| 782 // We need to adjust the offsets for the list item marker. | |
| 783 RenderObject* renderer = coreObject->renderer(); | |
| 784 if (renderer && renderer->isListItem()) { | |
| 785 String markerText = toRenderListItem(renderer)->markerTextWithSuffix(); | |
| 786 int markerLength = markerText.length(); | |
| 787 if (startOffset < markerLength || endOffset < markerLength) | |
| 788 return FALSE; | |
| 789 | |
| 790 startOffset -= markerLength; | |
| 791 endOffset -= markerLength; | |
| 792 } | |
| 793 | |
| 794 PlainTextRange textRange(startOffset, endOffset - startOffset); | |
| 795 VisiblePositionRange range = coreObject->visiblePositionRangeForRange(textRa
nge); | |
| 796 if (range.isNull()) | |
| 797 return FALSE; | |
| 798 | |
| 799 coreObject->setSelectedVisiblePositionRange(range); | |
| 800 return TRUE; | |
| 801 } | |
| 802 | |
| 803 static gboolean webkitAccessibleTextRemoveSelection(AtkText* text, gint selectio
nNum) | |
| 804 { | |
| 805 // WebCore does not support multiple selection, so anything but 0 does not m
ake sense for now. | |
| 806 if (selectionNum) | |
| 807 return FALSE; | |
| 808 | |
| 809 // Do nothing if current selection doesn't belong to the object | |
| 810 if (!webkitAccessibleTextGetNSelections(text)) | |
| 811 return FALSE; | |
| 812 | |
| 813 // Set a new 0-sized selection to the caret position, in order | |
| 814 // to simulate selection removal (GAIL style) | |
| 815 gint caretOffset = webkitAccessibleTextGetCaretOffset(text); | |
| 816 return webkitAccessibleTextSetSelection(text, selectionNum, caretOffset, car
etOffset); | |
| 817 } | |
| 818 | |
| 819 static gboolean webkitAccessibleTextSetCaretOffset(AtkText* text, gint offset) | |
| 820 { | |
| 821 AccessibilityObject* coreObject = core(text); | |
| 822 | |
| 823 if (!coreObject->isAccessibilityRenderObject()) | |
| 824 return FALSE; | |
| 825 | |
| 826 RenderObject* renderer = coreObject->renderer(); | |
| 827 if (renderer && renderer->isListItem()) { | |
| 828 String markerText = toRenderListItem(renderer)->markerTextWithSuffix(); | |
| 829 int markerLength = markerText.length(); | |
| 830 if (offset < markerLength) | |
| 831 return FALSE; | |
| 832 | |
| 833 // We need to adjust the offset for list items. | |
| 834 offset -= markerLength; | |
| 835 } | |
| 836 | |
| 837 PlainTextRange textRange(offset, 0); | |
| 838 VisiblePositionRange range = coreObject->visiblePositionRangeForRange(textRa
nge); | |
| 839 if (range.isNull()) | |
| 840 return FALSE; | |
| 841 | |
| 842 coreObject->setSelectedVisiblePositionRange(range); | |
| 843 return TRUE; | |
| 844 } | |
| 845 | |
| 846 void webkitAccessibleTextInterfaceInit(AtkTextIface* iface) | |
| 847 { | |
| 848 iface->get_text = webkitAccessibleTextGetText; | |
| 849 iface->get_text_after_offset = webkitAccessibleTextGetTextAfterOffset; | |
| 850 iface->get_text_at_offset = webkitAccessibleTextGetTextAtOffset; | |
| 851 iface->get_text_before_offset = webkitAccessibleTextGetTextBeforeOffset; | |
| 852 iface->get_character_at_offset = webkitAccessibleTextGetCharacterAtOffset; | |
| 853 iface->get_caret_offset = webkitAccessibleTextGetCaretOffset; | |
| 854 iface->get_run_attributes = webkitAccessibleTextGetRunAttributes; | |
| 855 iface->get_default_attributes = webkitAccessibleTextGetDefaultAttributes; | |
| 856 iface->get_character_extents = webkitAccessibleTextGetCharacterExtents; | |
| 857 iface->get_range_extents = webkitAccessibleTextGetRangeExtents; | |
| 858 iface->get_character_count = webkitAccessibleTextGetCharacterCount; | |
| 859 iface->get_offset_at_point = webkitAccessibleTextGetOffsetAtPoint; | |
| 860 iface->get_n_selections = webkitAccessibleTextGetNSelections; | |
| 861 iface->get_selection = webkitAccessibleTextGetSelection; | |
| 862 iface->add_selection = webkitAccessibleTextAddSelection; | |
| 863 iface->remove_selection = webkitAccessibleTextRemoveSelection; | |
| 864 iface->set_selection = webkitAccessibleTextSetSelection; | |
| 865 iface->set_caret_offset = webkitAccessibleTextSetCaretOffset; | |
| 866 } | |
| 867 | |
| 868 #endif | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 13726025:
Remove GTK AX support, we've never used it (Closed)
Base URL: svn://svn.chromium.org/blink/trunk