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| 1 /* | |
| 2 * Copyright (C) 2008 Apple Ltd. | |
| 3 * Copyright (C) 2008 Alp Toker <alp@atoker.com> | |
| 4 * | |
| 5 * This library is free software; you can redistribute it and/or | |
| 6 * modify it under the terms of the GNU Library General Public | |
| 7 * License as published by the Free Software Foundation; either | |
| 8 * version 2 of the License, or (at your option) any later version. | |
| 9 * | |
| 10 * This library is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 * Library General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU Library General Public License | |
| 16 * along with this library; see the file COPYING.LIB. If not, write to | |
| 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
| 18 * Boston, MA 02110-1301, USA. | |
| 19 */ | |
| 20 | |
| 21 #include "config.h" | |
| 22 #include "AccessibilityObject.h" | |
| 23 | |
| 24 #include "RenderObject.h" | |
| 25 #include "RenderText.h" | |
| 26 #include <glib-object.h> | |
| 27 | |
| 28 #if HAVE(ACCESSIBILITY) | |
| 29 | |
| 30 namespace WebCore { | |
| 31 | |
| 32 bool AccessibilityObject::accessibilityIgnoreAttachment() const | |
| 33 { | |
| 34 return false; | |
| 35 } | |
| 36 | |
| 37 AccessibilityObjectInclusion AccessibilityObject::accessibilityPlatformIncludesO
bject() const | |
| 38 { | |
| 39 AccessibilityObject* parent = parentObject(); | |
| 40 if (!parent) | |
| 41 return DefaultBehavior; | |
| 42 | |
| 43 AccessibilityRole role = roleValue(); | |
| 44 if (role == HorizontalRuleRole) | |
| 45 return IncludeObject; | |
| 46 | |
| 47 // We expose the slider as a whole but not its value indicator. | |
| 48 if (role == SliderThumbRole) | |
| 49 return IgnoreObject; | |
| 50 | |
| 51 // When a list item is made up entirely of children (e.g. paragraphs) | |
| 52 // the list item gets ignored. We need it. | |
| 53 if (isGroup() && parent->isList()) | |
| 54 return IncludeObject; | |
| 55 | |
| 56 // Entries and password fields have extraneous children which we want to ign
ore. | |
| 57 if (parent->isPasswordField() || parent->isTextControl()) | |
| 58 return IgnoreObject; | |
| 59 | |
| 60 // Include all tables, even layout tables. The AT can decide what to do with
each. | |
| 61 if (role == CellRole || role == TableRole) | |
| 62 return IncludeObject; | |
| 63 | |
| 64 // The object containing the text should implement AtkText itself. | |
| 65 if (role == StaticTextRole) | |
| 66 return IgnoreObject; | |
| 67 | |
| 68 // Include all list items, regardless they have or not inline children | |
| 69 if (role == ListItemRole) | |
| 70 return IncludeObject; | |
| 71 | |
| 72 // Bullets/numbers for list items shouldn't be exposed as AtkObjects. | |
| 73 if (role == ListMarkerRole) | |
| 74 return IgnoreObject; | |
| 75 | |
| 76 // Never expose an unknown object, since AT's won't know what to | |
| 77 // do with them. This is what is done on the Mac as well. | |
| 78 if (role == UnknownRole) | |
| 79 return IgnoreObject; | |
| 80 | |
| 81 // Given a paragraph or div containing a non-nested anonymous block, WebCore | |
| 82 // ignores the paragraph or div and includes the block. We want the opposite
: | |
| 83 // ATs are expecting accessible objects associated with textual elements. Th
ey | |
| 84 // usually have no need for the anonymous block. And when the wrong objects | |
| 85 // get included or ignored, needed accessibility signals do not get emitted. | |
| 86 if (role == ParagraphRole || role == DivRole) { | |
| 87 // Don't call textUnderElement() here, because it's slow and it can | |
| 88 // crash when called while we're in the middle of a subtree being delete
d. | |
| 89 if (!renderer()->firstChild()) | |
| 90 return DefaultBehavior; | |
| 91 | |
| 92 if (!parent->renderer() || parent->renderer()->isAnonymousBlock()) | |
| 93 return DefaultBehavior; | |
| 94 | |
| 95 for (RenderObject* r = renderer()->firstChild(); r; r = r->nextSibling()
) { | |
| 96 if (r->isAnonymousBlock()) | |
| 97 return IncludeObject; | |
| 98 } | |
| 99 } | |
| 100 | |
| 101 // Block spans result in objects of ATK_ROLE_PANEL which are almost always u
nwanted. | |
| 102 // However, if we ignore block spans whose parent is the body, the child con
trols | |
| 103 // will become immediate children of the ATK_ROLE_DOCUMENT_FRAME and any tex
t will | |
| 104 // become text within the document frame itself. This ultimately may be what
we want | |
| 105 // and would largely be consistent with what we see from Gecko. However, ign
oring | |
| 106 // spans whose parent is the body changes the current behavior we see from W
ebCore. | |
| 107 // Until we have sufficient time to properly analyze these cases, we will de
fer to | |
| 108 // WebCore. We only check that the parent is not aria because we do not expe
ct | |
| 109 // anonymous blocks which are aria-related to themselves have an aria role,
nor | |
| 110 // have we encountered instances where the parent of an anonymous block also
lacked | |
| 111 // an aria role but the grandparent had one. | |
| 112 if (renderer() && renderer()->isAnonymousBlock() && !parent->renderer()->isB
ody() | |
| 113 && parent->ariaRoleAttribute() == UnknownRole) | |
| 114 return IgnoreObject; | |
| 115 | |
| 116 return DefaultBehavior; | |
| 117 } | |
| 118 | |
| 119 AccessibilityObjectWrapper* AccessibilityObject::wrapper() const | |
| 120 { | |
| 121 return m_wrapper; | |
| 122 } | |
| 123 | |
| 124 void AccessibilityObject::setWrapper(AccessibilityObjectWrapper* wrapper) | |
| 125 { | |
| 126 if (wrapper == m_wrapper) | |
| 127 return; | |
| 128 | |
| 129 if (m_wrapper) | |
| 130 g_object_unref(m_wrapper); | |
| 131 | |
| 132 m_wrapper = wrapper; | |
| 133 | |
| 134 if (m_wrapper) | |
| 135 g_object_ref(m_wrapper); | |
| 136 } | |
| 137 | |
| 138 bool AccessibilityObject::allowsTextRanges() const | |
| 139 { | |
| 140 // Check type for the AccessibilityObject. | |
| 141 if (isTextControl() || isWebArea() || isGroup() || isLink() || isHeading() |
| isListItem() || isTableCell()) | |
| 142 return true; | |
| 143 | |
| 144 // Check roles as the last fallback mechanism. | |
| 145 AccessibilityRole role = roleValue(); | |
| 146 return role == ParagraphRole || role == LabelRole || role == DivRole || role
== FormRole; | |
| 147 } | |
| 148 | |
| 149 unsigned AccessibilityObject::getLengthForTextRange() const | |
| 150 { | |
| 151 unsigned textLength = text().length(); | |
| 152 | |
| 153 if (textLength) | |
| 154 return textLength; | |
| 155 | |
| 156 // Gtk ATs need this for all text objects; not just text controls. | |
| 157 Node* node = this->node(); | |
| 158 RenderObject* renderer = node ? node->renderer() : 0; | |
| 159 if (renderer && renderer->isText()) { | |
| 160 RenderText* renderText = toRenderText(renderer); | |
| 161 textLength = renderText ? renderText->textLength() : 0; | |
| 162 } | |
| 163 | |
| 164 // Get the text length from the elements under the | |
| 165 // accessibility object if the value is still zero. | |
| 166 if (!textLength && allowsTextRanges()) | |
| 167 textLength = textUnderElement().length(); | |
| 168 | |
| 169 return textLength; | |
| 170 } | |
| 171 | |
| 172 } // namespace WebCore | |
| 173 | |
| 174 #endif // HAVE(ACCESSIBILITY) | |
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Chromium Code Reviews
Issue 13726025:
Remove GTK AX support, we've never used it (Closed)
Base URL: svn://svn.chromium.org/blink/trunk