/* * Copyright (C) 2008 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "AccessibilityRenderObject.h" #include "AXObjectCache.h" #include "AccessibilityImageMapLink.h" #include "AccessibilityListBox.h" #include "EventNames.h" #include "FloatRect.h" #include "Frame.h" #include "FrameLoader.h" #include "HTMLAreaElement.h" #include "HTMLFormElement.h" #include "HTMLFrameElementBase.h" #include "HTMLImageElement.h" #include "HTMLInputElement.h" #include "HTMLLabelElement.h" #include "HTMLMapElement.h" #include "HTMLOptGroupElement.h" #include "HTMLOptionElement.h" #include "HTMLOptionsCollection.h" #include "HTMLSelectElement.h" #include "HTMLTextAreaElement.h" #include "HitTestRequest.h" #include "HitTestResult.h" #include "LocalizedStrings.h" #include "MathMLNames.h" #include "NodeList.h" #include "ProgressTracker.h" #include "RenderButton.h" #include "RenderFieldset.h" #include "RenderFileUploadControl.h" #include "RenderHTMLCanvas.h" #include "RenderImage.h" #include "RenderInline.h" #include "RenderLayer.h" #include "RenderListBox.h" #include "RenderListMarker.h" #include "RenderMenuList.h" #include "RenderText.h" #include "RenderTextControl.h" #include "RenderTextFragment.h" #include "RenderTheme.h" #include "RenderView.h" #include "RenderWidget.h" #include "SelectElement.h" #include "SelectionController.h" #include "Text.h" #include "TextIterator.h" #include "htmlediting.h" #include "visible_units.h" #include #include #include using namespace std; namespace WebCore { using namespace HTMLNames; AccessibilityRenderObject::AccessibilityRenderObject(RenderObject* renderer) : AccessibilityObject() , m_renderer(renderer) , m_ariaRole(UnknownRole) , m_childrenDirty(false) , m_roleForMSAA(UnknownRole) { m_role = determineAccessibilityRole(); #ifndef NDEBUG m_renderer->setHasAXObject(true); #endif } AccessibilityRenderObject::~AccessibilityRenderObject() { ASSERT(isDetached()); } PassRefPtr AccessibilityRenderObject::create(RenderObject* renderer) { return adoptRef(new AccessibilityRenderObject(renderer)); } void AccessibilityRenderObject::detach() { clearChildren(); AccessibilityObject::detach(); #ifndef NDEBUG if (m_renderer) m_renderer->setHasAXObject(false); #endif m_renderer = 0; } RenderBoxModelObject* AccessibilityRenderObject::renderBoxModelObject() const { if (!m_renderer || !m_renderer->isBoxModelObject()) return 0; return toRenderBoxModelObject(m_renderer); } static inline bool isInlineWithContinuation(RenderObject* object) { if (!object->isBoxModelObject()) return false; RenderBoxModelObject* renderer = toRenderBoxModelObject(object); if (!renderer->isRenderInline()) return false; return toRenderInline(renderer)->continuation(); } static inline RenderObject* firstChildInContinuation(RenderObject* renderer) { RenderObject* r = toRenderInline(renderer)->continuation(); while (r) { if (r->isRenderBlock()) return r; if (RenderObject* child = r->firstChild()) return child; r = toRenderInline(r)->continuation(); } return 0; } static inline RenderObject* firstChildConsideringContinuation(RenderObject* renderer) { RenderObject* firstChild = renderer->firstChild(); if (!firstChild && isInlineWithContinuation(renderer)) firstChild = firstChildInContinuation(renderer); return firstChild; } static inline RenderObject* lastChildConsideringContinuation(RenderObject* renderer) { RenderObject* lastChild = renderer->lastChild(); RenderObject* prev; RenderObject* cur = renderer; if (!cur->isRenderInline() && !cur->isRenderBlock()) return renderer; while (cur) { prev = cur; if (RenderObject* lc = cur->lastChild()) lastChild = lc; if (cur->isRenderInline()) { cur = toRenderInline(cur)->inlineElementContinuation(); ASSERT(cur || !toRenderInline(prev)->continuation()); } else cur = toRenderBlock(cur)->inlineElementContinuation(); } return lastChild; } AccessibilityObject* AccessibilityRenderObject::firstChild() const { if (!m_renderer) return 0; RenderObject* firstChild = firstChildConsideringContinuation(m_renderer); if (!firstChild) return 0; return axObjectCache()->getOrCreate(firstChild); } AccessibilityObject* AccessibilityRenderObject::lastChild() const { if (!m_renderer) return 0; RenderObject* lastChild = lastChildConsideringContinuation(m_renderer); if (!lastChild) return 0; return axObjectCache()->getOrCreate(lastChild); } static inline RenderInline* startOfContinuations(RenderObject* r) { if (r->isInlineElementContinuation()) return toRenderInline(r->node()->renderer()); // Blocks with a previous continuation always have a next continuation if (r->isRenderBlock() && toRenderBlock(r)->inlineElementContinuation()) return toRenderInline(toRenderBlock(r)->inlineElementContinuation()->node()->renderer()); return 0; } static inline RenderObject* endOfContinuations(RenderObject* renderer) { RenderObject* prev = renderer; RenderObject* cur = renderer; if (!cur->isRenderInline() && !cur->isRenderBlock()) return renderer; while (cur) { prev = cur; if (cur->isRenderInline()) { cur = toRenderInline(cur)->inlineElementContinuation(); ASSERT(cur || !toRenderInline(prev)->continuation()); } else cur = toRenderBlock(cur)->inlineElementContinuation(); } return prev; } static inline RenderObject* childBeforeConsideringContinuations(RenderInline* r, RenderObject* child) { RenderBoxModelObject* curContainer = r; RenderObject* cur = 0; RenderObject* prev = 0; while (curContainer) { if (curContainer->isRenderInline()) { cur = curContainer->firstChild(); while (cur) { if (cur == child) return prev; prev = cur; cur = cur->nextSibling(); } curContainer = toRenderInline(curContainer)->continuation(); } else if (curContainer->isRenderBlock()) { if (curContainer == child) return prev; prev = curContainer; curContainer = toRenderBlock(curContainer)->inlineElementContinuation(); } } ASSERT_NOT_REACHED(); return 0; } static inline bool firstChildIsInlineContinuation(RenderObject* renderer) { return renderer->firstChild() && renderer->firstChild()->isInlineElementContinuation(); } AccessibilityObject* AccessibilityRenderObject::previousSibling() const { if (!m_renderer) return 0; RenderObject* previousSibling = 0; // Case 1: The node is a block and is an inline's continuation. In that case, the inline's // last child is our previous sibling (or further back in the continuation chain) RenderInline* startOfConts; if (m_renderer->isRenderBlock() && (startOfConts = startOfContinuations(m_renderer))) previousSibling = childBeforeConsideringContinuations(startOfConts, m_renderer); // Case 2: Anonymous block parent of the end of a continuation - skip all the way to before // the parent of the start, since everything in between will be linked up via the continuation. else if (m_renderer->isAnonymousBlock() && firstChildIsInlineContinuation(m_renderer)) previousSibling = startOfContinuations(m_renderer->firstChild())->parent()->previousSibling(); // Case 3: The node has an actual previous sibling else if (RenderObject* ps = m_renderer->previousSibling()) previousSibling = ps; // Case 4: This node has no previous siblings, but its parent is an inline, // and is another node's inline continutation. Follow the continuation chain. else if (m_renderer->parent()->isRenderInline() && (startOfConts = startOfContinuations(m_renderer->parent()))) previousSibling = childBeforeConsideringContinuations(startOfConts, m_renderer->parent()->firstChild()); if (!previousSibling) return 0; return axObjectCache()->getOrCreate(previousSibling); } static inline bool lastChildHasContinuation(RenderObject* renderer) { return renderer->lastChild() && isInlineWithContinuation(renderer->lastChild()); } AccessibilityObject* AccessibilityRenderObject::nextSibling() const { if (!m_renderer) return 0; RenderObject* nextSibling = 0; // Case 1: node is a block and has an inline continuation. Next sibling is the inline continuation's // first child. RenderInline* inlineContinuation; if (m_renderer->isRenderBlock() && (inlineContinuation = toRenderBlock(m_renderer)->inlineElementContinuation())) nextSibling = firstChildConsideringContinuation(inlineContinuation); // Case 2: Anonymous block parent of the start of a continuation - skip all the way to // after the parent of the end, since everything in between will be linked up via the continuation. else if (m_renderer->isAnonymousBlock() && lastChildHasContinuation(m_renderer)) nextSibling = endOfContinuations(m_renderer->lastChild())->parent()->nextSibling(); // Case 3: node has an actual next sibling else if (RenderObject* ns = m_renderer->nextSibling()) nextSibling = ns; // Case 4: node is an inline with a continuation. Next sibling is the next sibling of the end // of the continuation chain. else if (isInlineWithContinuation(m_renderer)) nextSibling = endOfContinuations(m_renderer)->nextSibling(); // Case 5: node has no next sibling, and its parent is an inline with a continuation. else if (isInlineWithContinuation(m_renderer->parent())) { RenderObject* continuation = toRenderInline(m_renderer->parent())->continuation(); // Case 5a: continuation is a block - in this case the block itself is the next sibling. if (continuation->isRenderBlock()) nextSibling = continuation; // Case 5b: continuation is an inline - in this case the inline's first child is the next sibling else nextSibling = firstChildConsideringContinuation(continuation); } if (!nextSibling) return 0; return axObjectCache()->getOrCreate(nextSibling); } static RenderBoxModelObject* nextContinuation(RenderObject* renderer) { ASSERT(renderer); if (renderer->isRenderInline() && !renderer->isReplaced()) return toRenderInline(renderer)->continuation(); if (renderer->isRenderBlock()) return toRenderBlock(renderer)->inlineElementContinuation(); return 0; } RenderObject* AccessibilityRenderObject::renderParentObject() const { if (!m_renderer) return 0; RenderObject* parent = m_renderer->parent(); // Case 1: node is a block and is an inline's continuation. Parent // is the start of the continuation chain. RenderObject* startOfConts = 0; RenderObject* firstChild = 0; if (m_renderer->isRenderBlock() && (startOfConts = startOfContinuations(m_renderer))) parent = startOfConts; // Case 2: node's parent is an inline which is some node's continuation; parent is // the earliest node in the continuation chain. else if (parent && parent->isRenderInline() && (startOfConts = startOfContinuations(parent))) parent = startOfConts; // Case 3: The first sibling is the beginning of a continuation chain. Find the origin of that continuation. else if (parent && (firstChild = parent->firstChild()) && firstChild->node()) { // Get the node's renderer and follow that continuation chain until the first child is found RenderObject* nodeRenderFirstChild = firstChild->node()->renderer(); if (nodeRenderFirstChild != firstChild) { for (RenderObject* contsTest = nodeRenderFirstChild; contsTest; contsTest = nextContinuation(contsTest)) { if (contsTest == firstChild) { parent = nodeRenderFirstChild->parent(); break; } } } } return parent; } AccessibilityObject* AccessibilityRenderObject::parentObjectIfExists() const { return axObjectCache()->get(renderParentObject()); } AccessibilityObject* AccessibilityRenderObject::parentObject() const { if (!m_renderer) return 0; if (ariaRoleAttribute() == MenuBarRole) return axObjectCache()->getOrCreate(m_renderer->parent()); // menuButton and its corresponding menu are DOM siblings, but Accessibility needs them to be parent/child if (ariaRoleAttribute() == MenuRole) { AccessibilityObject* parent = menuButtonForMenu(); if (parent) return parent; } RenderObject* parentObj = renderParentObject(); if (parentObj) return axObjectCache()->getOrCreate(parentObj); // WebArea's parent should be the scroll view containing it. if (isWebArea()) return axObjectCache()->getOrCreate(m_renderer->frame()->view()); return 0; } bool AccessibilityRenderObject::isWebArea() const { return roleValue() == WebAreaRole; } bool AccessibilityRenderObject::isImageButton() const { return isNativeImage() && roleValue() == ButtonRole; } bool AccessibilityRenderObject::isAnchor() const { return !isNativeImage() && isLink(); } bool AccessibilityRenderObject::isNativeTextControl() const { return m_renderer->isTextControl(); } bool AccessibilityRenderObject::isNativeImage() const { return m_renderer->isBoxModelObject() && toRenderBoxModelObject(m_renderer)->isImage(); } bool AccessibilityRenderObject::isImage() const { return roleValue() == ImageRole; } bool AccessibilityRenderObject::isAttachment() const { RenderBoxModelObject* renderer = renderBoxModelObject(); if (!renderer) return false; // Widgets are the replaced elements that we represent to AX as attachments bool isWidget = renderer->isWidget(); ASSERT(!isWidget || (renderer->isReplaced() && !isImage())); return isWidget && ariaRoleAttribute() == UnknownRole; } bool AccessibilityRenderObject::isPasswordField() const { ASSERT(m_renderer); if (!m_renderer->node() || !m_renderer->node()->isHTMLElement()) return false; if (ariaRoleAttribute() != UnknownRole) return false; InputElement* inputElement = m_renderer->node()->toInputElement(); if (!inputElement) return false; return inputElement->isPasswordField(); } bool AccessibilityRenderObject::isFileUploadButton() const { if (m_renderer && m_renderer->node() && m_renderer->node()->hasTagName(inputTag)) { HTMLInputElement* input = static_cast(m_renderer->node()); return input->isFileUpload(); } return false; } bool AccessibilityRenderObject::isInputImage() const { Node* elementNode = node(); if (roleValue() == ButtonRole && elementNode && elementNode->hasTagName(inputTag)) { HTMLInputElement* input = static_cast(elementNode); return input->isImageButton(); } return false; } bool AccessibilityRenderObject::isProgressIndicator() const { return roleValue() == ProgressIndicatorRole; } bool AccessibilityRenderObject::isSlider() const { return roleValue() == SliderRole; } bool AccessibilityRenderObject::isMenuRelated() const { AccessibilityRole role = roleValue(); return role == MenuRole || role == MenuBarRole || role == MenuButtonRole || role == MenuItemRole; } bool AccessibilityRenderObject::isMenu() const { return roleValue() == MenuRole; } bool AccessibilityRenderObject::isMenuBar() const { return roleValue() == MenuBarRole; } bool AccessibilityRenderObject::isMenuButton() const { return roleValue() == MenuButtonRole; } bool AccessibilityRenderObject::isMenuItem() const { return roleValue() == MenuItemRole; } bool AccessibilityRenderObject::isPressed() const { ASSERT(m_renderer); if (roleValue() != ButtonRole) return false; Node* node = m_renderer->node(); if (!node) return false; // If this is an ARIA button, check the aria-pressed attribute rather than node()->active() if (ariaRoleAttribute() == ButtonRole) { if (equalIgnoringCase(getAttribute(aria_pressedAttr), "true")) return true; return false; } return node->active(); } bool AccessibilityRenderObject::isIndeterminate() const { ASSERT(m_renderer); if (!m_renderer->node()) return false; InputElement* inputElement = m_renderer->node()->toInputElement(); if (!inputElement) return false; return inputElement->isIndeterminate(); } bool AccessibilityRenderObject::isNativeCheckboxOrRadio() const { Node* elementNode = node(); if (elementNode) { InputElement* input = elementNode->toInputElement(); if (input) return input->isCheckbox() || input->isRadioButton(); } return false; } bool AccessibilityRenderObject::isChecked() const { ASSERT(m_renderer); if (!m_renderer->node()) return false; // First test for native checkedness semantics InputElement* inputElement = m_renderer->node()->toInputElement(); if (inputElement) return inputElement->isChecked(); // Else, if this is an ARIA checkbox or radio, respect the aria-checked attribute AccessibilityRole ariaRole = ariaRoleAttribute(); if (ariaRole == RadioButtonRole || ariaRole == CheckBoxRole) { if (equalIgnoringCase(getAttribute(aria_checkedAttr), "true")) return true; return false; } // Otherwise it's not checked return false; } bool AccessibilityRenderObject::isHovered() const { ASSERT(m_renderer); return m_renderer->node() && m_renderer->node()->hovered(); } bool AccessibilityRenderObject::isMultiSelectable() const { ASSERT(m_renderer); const AtomicString& ariaMultiSelectable = getAttribute(aria_multiselectableAttr); if (equalIgnoringCase(ariaMultiSelectable, "true")) return true; if (equalIgnoringCase(ariaMultiSelectable, "false")) return false; if (!m_renderer->isBoxModelObject() || !toRenderBoxModelObject(m_renderer)->isListBox()) return false; return m_renderer->node() && static_cast(m_renderer->node())->multiple(); } bool AccessibilityRenderObject::isReadOnly() const { ASSERT(m_renderer); if (isWebArea()) { Document* document = m_renderer->document(); if (!document) return true; HTMLElement* body = document->body(); if (body && body->isContentEditable()) return false; return !document->rendererIsEditable(); } if (m_renderer->isBoxModelObject()) { RenderBoxModelObject* box = toRenderBoxModelObject(m_renderer); if (box->isTextField()) return static_cast(box->node())->readOnly(); if (box->isTextArea()) return static_cast(box->node())->readOnly(); } return !m_renderer->node() || !m_renderer->node()->rendererIsEditable(); } bool AccessibilityRenderObject::isOffScreen() const { ASSERT(m_renderer); IntRect contentRect = m_renderer->absoluteClippedOverflowRect(); FrameView* view = m_renderer->frame()->view(); FloatRect viewRect = view->visibleContentRect(); viewRect.intersect(contentRect); return viewRect.isEmpty(); } int AccessibilityRenderObject::headingLevel() const { // headings can be in block flow and non-block flow Node* element = node(); if (!element) return 0; if (ariaRoleAttribute() == HeadingRole) return getAttribute(aria_levelAttr).toInt(); if (element->hasTagName(h1Tag)) return 1; if (element->hasTagName(h2Tag)) return 2; if (element->hasTagName(h3Tag)) return 3; if (element->hasTagName(h4Tag)) return 4; if (element->hasTagName(h5Tag)) return 5; if (element->hasTagName(h6Tag)) return 6; return 0; } bool AccessibilityRenderObject::isHeading() const { return roleValue() == HeadingRole; } bool AccessibilityRenderObject::isLink() const { return roleValue() == WebCoreLinkRole; } bool AccessibilityRenderObject::isControl() const { if (!m_renderer) return false; Node* node = m_renderer->node(); return node && ((node->isElementNode() && static_cast(node)->isFormControlElement()) || AccessibilityObject::isARIAControl(ariaRoleAttribute())); } bool AccessibilityRenderObject::isFieldset() const { RenderBoxModelObject* renderer = renderBoxModelObject(); if (!renderer) return false; return renderer->isFieldset(); } bool AccessibilityRenderObject::isGroup() const { return roleValue() == GroupRole; } AccessibilityObject* AccessibilityRenderObject::selectedRadioButton() { if (!isRadioGroup()) return 0; // Find the child radio button that is selected (ie. the intValue == 1). int count = m_children.size(); for (int i = 0; i < count; ++i) { AccessibilityObject* object = m_children[i].get(); if (object->roleValue() == RadioButtonRole && object->checkboxOrRadioValue() == ButtonStateOn) return object; } return 0; } AccessibilityObject* AccessibilityRenderObject::selectedTabItem() { if (!isTabList()) return 0; // Find the child tab item that is selected (ie. the intValue == 1). AccessibilityObject::AccessibilityChildrenVector tabs; tabChildren(tabs); int count = tabs.size(); for (int i = 0; i < count; ++i) { AccessibilityObject* object = m_children[i].get(); if (object->isTabItem() && object->isChecked()) return object; } return 0; } Element* AccessibilityRenderObject::anchorElement() const { if (!m_renderer) return 0; AXObjectCache* cache = axObjectCache(); RenderObject* currRenderer; // Search up the render tree for a RenderObject with a DOM node. Defer to an earlier continuation, though. for (currRenderer = m_renderer; currRenderer && !currRenderer->node(); currRenderer = currRenderer->parent()) { if (currRenderer->isAnonymousBlock()) { RenderObject* continuation = toRenderBlock(currRenderer)->continuation(); if (continuation) return cache->getOrCreate(continuation)->anchorElement(); } } // bail if none found if (!currRenderer) return 0; // search up the DOM tree for an anchor element // NOTE: this assumes that any non-image with an anchor is an HTMLAnchorElement Node* node = currRenderer->node(); for ( ; node; node = node->parentNode()) { if (node->hasTagName(aTag) || (node->renderer() && cache->getOrCreate(node->renderer())->isAnchor())) return static_cast(node); } return 0; } Element* AccessibilityRenderObject::actionElement() const { if (!m_renderer) return 0; Node* node = m_renderer->node(); if (node) { if (node->hasTagName(inputTag)) { HTMLInputElement* input = static_cast(node); if (!input->disabled() && (isCheckboxOrRadio() || input->isTextButton())) return input; } else if (node->hasTagName(buttonTag)) return static_cast(node); } if (isFileUploadButton()) return static_cast(m_renderer->node()); if (AccessibilityObject::isARIAInput(ariaRoleAttribute())) return static_cast(m_renderer->node()); if (isImageButton()) return static_cast(m_renderer->node()); if (m_renderer->isBoxModelObject() && toRenderBoxModelObject(m_renderer)->isMenuList()) return static_cast(m_renderer->node()); AccessibilityRole role = roleValue(); if (role == ButtonRole || role == PopUpButtonRole) return static_cast(m_renderer->node()); Element* elt = anchorElement(); if (!elt) elt = mouseButtonListener(); return elt; } Element* AccessibilityRenderObject::mouseButtonListener() const { Node* node = m_renderer->node(); if (!node) return 0; // check if our parent is a mouse button listener while (node && !node->isElementNode()) node = node->parentNode(); if (!node) return 0; // FIXME: Do the continuation search like anchorElement does for (Element* element = static_cast(node); element; element = element->parentElement()) { if (element->getAttributeEventListener(eventNames().clickEvent) || element->getAttributeEventListener(eventNames().mousedownEvent) || element->getAttributeEventListener(eventNames().mouseupEvent)) return element; } return 0; } void AccessibilityRenderObject::increment() { if (roleValue() != SliderRole) return; changeValueByPercent(5); } void AccessibilityRenderObject::decrement() { if (roleValue() != SliderRole) return; changeValueByPercent(-5); } static Element* siblingWithAriaRole(String role, Node* node) { Node* sibling = node->parentNode()->firstChild(); while (sibling) { if (sibling->isElementNode()) { const AtomicString& siblingAriaRole = static_cast(sibling)->getAttribute(roleAttr); if (equalIgnoringCase(siblingAriaRole, role)) return static_cast(sibling); } sibling = sibling->nextSibling(); } return 0; } Element* AccessibilityRenderObject::menuElementForMenuButton() const { if (ariaRoleAttribute() != MenuButtonRole) return 0; return siblingWithAriaRole("menu", renderer()->node()); } AccessibilityObject* AccessibilityRenderObject::menuForMenuButton() const { Element* menu = menuElementForMenuButton(); if (menu && menu->renderer()) return axObjectCache()->getOrCreate(menu->renderer()); return 0; } Element* AccessibilityRenderObject::menuItemElementForMenu() const { if (ariaRoleAttribute() != MenuRole) return 0; return siblingWithAriaRole("menuitem", renderer()->node()); } AccessibilityObject* AccessibilityRenderObject::menuButtonForMenu() const { Element* menuItem = menuItemElementForMenu(); if (menuItem && menuItem->renderer()) { // ARIA just has generic menu items. AppKit needs to know if this is a top level items like MenuBarButton or MenuBarItem AccessibilityObject* menuItemAX = axObjectCache()->getOrCreate(menuItem->renderer()); if (menuItemAX->isMenuButton()) return menuItemAX; } return 0; } String AccessibilityRenderObject::helpText() const { if (!m_renderer) return String(); const AtomicString& ariaHelp = getAttribute(aria_helpAttr); if (!ariaHelp.isEmpty()) return ariaHelp; for (RenderObject* curr = m_renderer; curr; curr = curr->parent()) { if (curr->node() && curr->node()->isHTMLElement()) { const AtomicString& summary = static_cast(curr->node())->getAttribute(summaryAttr); if (!summary.isEmpty()) return summary; const AtomicString& title = static_cast(curr->node())->getAttribute(titleAttr); if (!title.isEmpty()) return title; } // Only take help text from an ancestor element if its a group or an unknown role. If help was // added to those kinds of elements, it is likely it was meant for a child element. AccessibilityObject* axObj = axObjectCache()->getOrCreate(curr); if (axObj) { AccessibilityRole role = axObj->roleValue(); if (role != GroupRole && role != UnknownRole) break; } } return String(); } unsigned AccessibilityRenderObject::hierarchicalLevel() const { if (!m_renderer) return 0; Node* node = m_renderer->node(); if (!node || !node->isElementNode()) return 0; Element* element = static_cast(node); String ariaLevel = element->getAttribute(aria_levelAttr); if (!ariaLevel.isEmpty()) return ariaLevel.toInt(); // Only tree item will calculate its level through the DOM currently. if (roleValue() != TreeItemRole) return 0; // Hierarchy leveling starts at 0. // We measure tree hierarchy by the number of groups that the item is within. unsigned level = 0; AccessibilityObject* parent = parentObject(); while (parent) { AccessibilityRole parentRole = parent->roleValue(); if (parentRole == GroupRole) level++; else if (parentRole == TreeRole) break; parent = parent->parentObject(); } return level; } static TextIteratorBehavior textIteratorBehaviorForTextRange() { TextIteratorBehavior behavior = TextIteratorIgnoresStyleVisibility; #if PLATFORM(GTK) // We need to emit replaced elements for GTK, and present // them with the 'object replacement character' (0xFFFC). behavior = static_cast(behavior | TextIteratorEmitsObjectReplacementCharacters); #endif return behavior; } String AccessibilityRenderObject::textUnderElement() const { if (!m_renderer) return String(); if (isFileUploadButton()) return toRenderFileUploadControl(m_renderer)->buttonValue(); Node* node = m_renderer->node(); if (node) { if (Frame* frame = node->document()->frame()) { // catch stale WebCoreAXObject (see ) if (frame->document() != node->document()) return String(); return plainText(rangeOfContents(node).get(), textIteratorBehaviorForTextRange()); } } // Sometimes text fragments don't have Node's associated with them (like when // CSS content is used to insert text). if (m_renderer->isText()) { RenderText* renderTextObject = toRenderText(m_renderer); if (renderTextObject->isTextFragment()) return String(static_cast(m_renderer)->contentString()); } // return the null string for anonymous text because it is non-trivial to get // the actual text and, so far, that is not needed return String(); } Node* AccessibilityRenderObject::node() const { return m_renderer ? m_renderer->node() : 0; } AccessibilityButtonState AccessibilityRenderObject::checkboxOrRadioValue() const { if (isNativeCheckboxOrRadio()) return isChecked() ? ButtonStateOn : ButtonStateOff; return AccessibilityObject::checkboxOrRadioValue(); } String AccessibilityRenderObject::valueDescription() const { // Only sliders and progress bars support value descriptions currently. if (!isProgressIndicator() && !isSlider()) return String(); return getAttribute(aria_valuetextAttr).string(); } float AccessibilityRenderObject::valueForRange() const { if (!isProgressIndicator() && !isSlider() && !isScrollbar()) return 0.0f; return getAttribute(aria_valuenowAttr).toFloat(); } float AccessibilityRenderObject::maxValueForRange() const { if (!isProgressIndicator() && !isSlider()) return 0.0f; return getAttribute(aria_valuemaxAttr).toFloat(); } float AccessibilityRenderObject::minValueForRange() const { if (!isProgressIndicator() && !isSlider()) return 0.0f; return getAttribute(aria_valueminAttr).toFloat(); } String AccessibilityRenderObject::stringValue() const { if (!m_renderer || isPasswordField()) return String(); RenderBoxModelObject* cssBox = renderBoxModelObject(); if (ariaRoleAttribute() == StaticTextRole) { String staticText = text(); if (!staticText.length()) staticText = textUnderElement(); return staticText; } if (m_renderer->isText()) return textUnderElement(); if (cssBox && cssBox->isMenuList()) { // RenderMenuList will go straight to the text() of its selected item. // This has to be overriden in the case where the selected item has an aria label SelectElement* selectNode = toSelectElement(static_cast(m_renderer->node())); int selectedIndex = selectNode->selectedIndex(); const Vector listItems = selectNode->listItems(); Element* selectedOption = 0; if (selectedIndex >= 0 && selectedIndex < (int)listItems.size()) selectedOption = listItems[selectedIndex]; if (selectedOption) { String overridenDescription = selectedOption->getAttribute(aria_labelAttr); if (!overridenDescription.isNull()) return overridenDescription; } return toRenderMenuList(m_renderer)->text(); } if (m_renderer->isListMarker()) return toRenderListMarker(m_renderer)->text(); if (cssBox && cssBox->isRenderButton()) return toRenderButton(m_renderer)->text(); if (isWebArea()) { if (m_renderer->frame()) return String(); // FIXME: should use startOfDocument and endOfDocument (or rangeForDocument?) here VisiblePosition startVisiblePosition = m_renderer->positionForCoordinates(0, 0); VisiblePosition endVisiblePosition = m_renderer->positionForCoordinates(INT_MAX, INT_MAX); if (startVisiblePosition.isNull() || endVisiblePosition.isNull()) return String(); return plainText(makeRange(startVisiblePosition, endVisiblePosition).get(), textIteratorBehaviorForTextRange()); } if (isTextControl()) return text(); if (isFileUploadButton()) return toRenderFileUploadControl(m_renderer)->fileTextValue(); // FIXME: We might need to implement a value here for more types // FIXME: It would be better not to advertise a value at all for the types for which we don't implement one; // this would require subclassing or making accessibilityAttributeNames do something other than return a // single static array. return String(); } // This function implements the ARIA accessible name as described by the Mozilla // ARIA Implementer's Guide. static String accessibleNameForNode(Node* node) { if (node->isTextNode()) return static_cast(node)->data(); if (node->hasTagName(inputTag)) return static_cast(node)->value(); if (node->isHTMLElement()) { const AtomicString& alt = toHTMLElement(node)->getAttribute(altAttr); if (!alt.isEmpty()) return alt; } return String(); } String AccessibilityRenderObject::accessibilityDescriptionForElements(Vector &elements) const { StringBuilder builder; unsigned size = elements.size(); for (unsigned i = 0; i < size; ++i) { Element* idElement = elements[i]; builder.append(accessibleNameForNode(idElement)); for (Node* n = idElement->firstChild(); n; n = n->traverseNextNode(idElement)) builder.append(accessibleNameForNode(n)); if (i != size - 1) builder.append(' '); } return builder.toString(); } void AccessibilityRenderObject::elementsFromAttribute(Vector& elements, const QualifiedName& attribute) const { Node* node = m_renderer->node(); if (!node || !node->isElementNode()) return; Document* document = m_renderer->document(); if (!document) return; String idList = getAttribute(attribute).string(); if (idList.isEmpty()) return; idList.replace('\n', ' '); Vector idVector; idList.split(' ', idVector); unsigned size = idVector.size(); for (unsigned i = 0; i < size; ++i) { String idName = idVector[i]; Element* idElement = document->getElementById(idName); if (idElement) elements.append(idElement); } } void AccessibilityRenderObject::ariaLabeledByElements(Vector& elements) const { elementsFromAttribute(elements, aria_labeledbyAttr); if (!elements.size()) elementsFromAttribute(elements, aria_labelledbyAttr); } String AccessibilityRenderObject::ariaLabeledByAttribute() const { Vector elements; ariaLabeledByElements(elements); return accessibilityDescriptionForElements(elements); } static HTMLLabelElement* labelForElement(Element* element) { RefPtr list = element->document()->getElementsByTagName("label"); unsigned len = list->length(); for (unsigned i = 0; i < len; i++) { if (list->item(i)->hasTagName(labelTag)) { HTMLLabelElement* label = static_cast(list->item(i)); if (label->control() == element) return label; } } return 0; } HTMLLabelElement* AccessibilityRenderObject::labelElementContainer() const { if (!m_renderer) return 0; // the control element should not be considered part of the label if (isControl()) return 0; // find if this has a parent that is a label for (Node* parentNode = m_renderer->node(); parentNode; parentNode = parentNode->parentNode()) { if (parentNode->hasTagName(labelTag)) return static_cast(parentNode); } return 0; } String AccessibilityRenderObject::title() const { AccessibilityRole ariaRole = ariaRoleAttribute(); if (!m_renderer) return String(); Node* node = m_renderer->node(); if (!node) return String(); String ariaLabel = ariaLabeledByAttribute(); if (!ariaLabel.isEmpty()) return ariaLabel; const AtomicString& title = getAttribute(titleAttr); if (!title.isEmpty()) return title; bool isInputTag = node->hasTagName(inputTag); if (isInputTag) { HTMLInputElement* input = static_cast(node); if (input->isTextButton()) return input->value(); } if (isInputTag || AccessibilityObject::isARIAInput(ariaRole) || isControl()) { HTMLLabelElement* label = labelForElement(static_cast(node)); if (label && !titleUIElement()) return label->innerText(); } if (roleValue() == ButtonRole || ariaRole == ListBoxOptionRole || ariaRole == MenuItemRole || ariaRole == MenuButtonRole || ariaRole == RadioButtonRole || ariaRole == CheckBoxRole || ariaRole == TabRole || ariaRole == PopUpButtonRole || isHeading() || isLink()) return textUnderElement(); return String(); } String AccessibilityRenderObject::ariaDescribedByAttribute() const { Vector elements; elementsFromAttribute(elements, aria_describedbyAttr); return accessibilityDescriptionForElements(elements); } String AccessibilityRenderObject::ariaAccessibilityDescription() const { const AtomicString& ariaLabel = getAttribute(aria_labelAttr); if (!ariaLabel.isEmpty()) return ariaLabel; String ariaDescription = ariaDescribedByAttribute(); if (!ariaDescription.isEmpty()) return ariaDescription; return String(); } String AccessibilityRenderObject::accessibilityDescription() const { if (!m_renderer) return String(); // Static text should not have a description, it should only have a stringValue. if (roleValue() == StaticTextRole) return String(); String ariaDescription = ariaAccessibilityDescription(); if (!ariaDescription.isEmpty()) return ariaDescription; Node* node = m_renderer->node(); if (isImage() || isInputImage() || isNativeImage()) { if (node && node->isHTMLElement()) { const AtomicString& alt = toHTMLElement(node)->getAttribute(altAttr); if (alt.isEmpty()) return String(); return alt; } } #if ENABLE(MATHML) if (node && node->isElementNode() && static_cast(node)->isMathMLElement()) return getAttribute(MathMLNames::alttextAttr); #endif if (isWebArea()) { Document* document = m_renderer->document(); // Check if the HTML element has an aria-label for the webpage. Element* documentElement = document->documentElement(); if (documentElement) { const AtomicString& ariaLabel = documentElement->getAttribute(aria_labelAttr); if (!ariaLabel.isEmpty()) return ariaLabel; } Node* owner = document->ownerElement(); if (owner) { if (owner->hasTagName(frameTag) || owner->hasTagName(iframeTag)) { const AtomicString& title = static_cast(owner)->getAttribute(titleAttr); if (!title.isEmpty()) return title; return static_cast(owner)->getAttribute(nameAttr); } if (owner->isHTMLElement()) return toHTMLElement(owner)->getAttribute(nameAttr); } owner = document->body(); if (owner && owner->isHTMLElement()) return toHTMLElement(owner)->getAttribute(nameAttr); } return String(); } IntRect AccessibilityRenderObject::boundingBoxRect() const { RenderObject* obj = m_renderer; if (!obj) return IntRect(); if (obj->node()) // If we are a continuation, we want to make sure to use the primary renderer. obj = obj->node()->renderer(); // absoluteFocusRingQuads will query the hierarchy below this element, which for large webpages can be very slow. // For a web area, which will have the most elements of any element, absoluteQuads should be used. Vector quads; if (obj->isText()) toRenderText(obj)->absoluteQuads(quads, RenderText::ClipToEllipsis); else if (isWebArea()) obj->absoluteQuads(quads); else obj->absoluteFocusRingQuads(quads); const size_t n = quads.size(); if (!n) return IntRect(); IntRect result; for (size_t i = 0; i < n; ++i) { IntRect r = quads[i].enclosingBoundingBox(); if (!r.isEmpty()) { if (obj->style()->hasAppearance()) obj->theme()->adjustRepaintRect(obj, r); result.unite(r); } } // The size of the web area should be the content size, not the clipped size. if (isWebArea() && obj->frame()->view()) result.setSize(obj->frame()->view()->contentsSize()); return result; } IntRect AccessibilityRenderObject::checkboxOrRadioRect() const { if (!m_renderer) return IntRect(); HTMLLabelElement* label = labelForElement(static_cast(m_renderer->node())); if (!label || !label->renderer()) return boundingBoxRect(); IntRect labelRect = axObjectCache()->getOrCreate(label->renderer())->elementRect(); labelRect.unite(boundingBoxRect()); return labelRect; } IntRect AccessibilityRenderObject::elementRect() const { // a checkbox or radio button should encompass its label if (isCheckboxOrRadio()) return checkboxOrRadioRect(); return boundingBoxRect(); } IntSize AccessibilityRenderObject::size() const { IntRect rect = elementRect(); return rect.size(); } IntPoint AccessibilityRenderObject::clickPoint() const { // use the default position unless this is an editable web area, in which case we use the selection bounds. if (!isWebArea() || isReadOnly()) return AccessibilityObject::clickPoint(); VisibleSelection visSelection = selection(); VisiblePositionRange range = VisiblePositionRange(visSelection.visibleStart(), visSelection.visibleEnd()); IntRect bounds = boundsForVisiblePositionRange(range); #if PLATFORM(MAC) bounds.setLocation(m_renderer->document()->view()->screenToContents(bounds.location())); #endif return IntPoint(bounds.x() + (bounds.width() / 2), bounds.y() - (bounds.height() / 2)); } AccessibilityObject* AccessibilityRenderObject::internalLinkElement() const { Element* element = anchorElement(); if (!element) return 0; // Right now, we do not support ARIA links as internal link elements if (!element->hasTagName(aTag)) return 0; HTMLAnchorElement* anchor = static_cast(element); KURL linkURL = anchor->href(); String fragmentIdentifier = linkURL.fragmentIdentifier(); if (fragmentIdentifier.isEmpty()) return 0; // check if URL is the same as current URL KURL documentURL = m_renderer->document()->url(); if (!equalIgnoringFragmentIdentifier(documentURL, linkURL)) return 0; Node* linkedNode = m_renderer->document()->findAnchor(fragmentIdentifier); if (!linkedNode) return 0; // The element we find may not be accessible, so find the first accessible object. return firstAccessibleObjectFromNode(linkedNode); } ESpeak AccessibilityRenderObject::speakProperty() const { if (!m_renderer) return AccessibilityObject::speakProperty(); return m_renderer->style()->speak(); } void AccessibilityRenderObject::addRadioButtonGroupMembers(AccessibilityChildrenVector& linkedUIElements) const { if (!m_renderer || roleValue() != RadioButtonRole) return; Node* node = m_renderer->node(); if (!node || !node->hasTagName(inputTag)) return; HTMLInputElement* input = static_cast(node); // if there's a form, then this is easy if (input->form()) { Vector > formElements; input->form()->getNamedElements(input->name(), formElements); unsigned len = formElements.size(); for (unsigned i = 0; i < len; ++i) { Node* associateElement = formElements[i].get(); if (AccessibilityObject* object = axObjectCache()->getOrCreate(associateElement->renderer())) linkedUIElements.append(object); } } else { RefPtr list = node->document()->getElementsByTagName("input"); unsigned len = list->length(); for (unsigned i = 0; i < len; ++i) { if (list->item(i)->hasTagName(inputTag)) { HTMLInputElement* associateElement = static_cast(list->item(i)); if (associateElement->isRadioButton() && associateElement->name() == input->name()) { if (AccessibilityObject* object = axObjectCache()->getOrCreate(associateElement->renderer())) linkedUIElements.append(object); } } } } } // linked ui elements could be all the related radio buttons in a group // or an internal anchor connection void AccessibilityRenderObject::linkedUIElements(AccessibilityChildrenVector& linkedUIElements) const { ariaFlowToElements(linkedUIElements); if (isAnchor()) { AccessibilityObject* linkedAXElement = internalLinkElement(); if (linkedAXElement) linkedUIElements.append(linkedAXElement); } if (roleValue() == RadioButtonRole) addRadioButtonGroupMembers(linkedUIElements); } bool AccessibilityRenderObject::hasTextAlternative() const { // ARIA: section 2A, bullet #3 says if aria-labeledby or aria-label appears, it should // override the "label" element association. if (!ariaLabeledByAttribute().isEmpty() || !getAttribute(aria_labelAttr).isEmpty()) return true; return false; } bool AccessibilityRenderObject::ariaHasPopup() const { return elementAttributeValue(aria_haspopupAttr); } bool AccessibilityRenderObject::supportsARIAFlowTo() const { return !getAttribute(aria_flowtoAttr).isEmpty(); } void AccessibilityRenderObject::ariaFlowToElements(AccessibilityChildrenVector& flowTo) const { Vector elements; elementsFromAttribute(elements, aria_flowtoAttr); AXObjectCache* cache = axObjectCache(); unsigned count = elements.size(); for (unsigned k = 0; k < count; ++k) { Element* element = elements[k]; AccessibilityObject* flowToElement = cache->getOrCreate(element->renderer()); if (flowToElement) flowTo.append(flowToElement); } } bool AccessibilityRenderObject::supportsARIADropping() const { const AtomicString& dropEffect = getAttribute(aria_dropeffectAttr); return !dropEffect.isEmpty(); } bool AccessibilityRenderObject::supportsARIADragging() const { const AtomicString& grabbed = getAttribute(aria_grabbedAttr); return equalIgnoringCase(grabbed, "true") || equalIgnoringCase(grabbed, "false"); } bool AccessibilityRenderObject::isARIAGrabbed() { return elementAttributeValue(aria_grabbedAttr); } void AccessibilityRenderObject::setARIAGrabbed(bool grabbed) { setElementAttributeValue(aria_grabbedAttr, grabbed); } void AccessibilityRenderObject::determineARIADropEffects(Vector& effects) { const AtomicString& dropEffects = getAttribute(aria_dropeffectAttr); if (dropEffects.isEmpty()) { effects.clear(); return; } String dropEffectsString = dropEffects.string(); dropEffectsString.replace('\n', ' '); dropEffectsString.split(' ', effects); } bool AccessibilityRenderObject::exposesTitleUIElement() const { if (!isControl()) return false; // checkbox or radio buttons don't expose the title ui element unless it has a title already if (isCheckboxOrRadio() && getAttribute(titleAttr).isEmpty()) return false; if (hasTextAlternative()) return false; return true; } AccessibilityObject* AccessibilityRenderObject::titleUIElement() const { if (!m_renderer) return 0; // if isFieldset is true, the renderer is guaranteed to be a RenderFieldset if (isFieldset()) return axObjectCache()->getOrCreate(toRenderFieldset(m_renderer)->findLegend()); if (!exposesTitleUIElement()) return 0; Node* element = m_renderer->node(); HTMLLabelElement* label = labelForElement(static_cast(element)); if (label && label->renderer()) return axObjectCache()->getOrCreate(label->renderer()); return 0; } bool AccessibilityRenderObject::ariaIsHidden() const { if (equalIgnoringCase(getAttribute(aria_hiddenAttr), "true")) return true; // aria-hidden hides this object and any children AccessibilityObject* object = parentObject(); while (object) { if (object->isAccessibilityRenderObject() && equalIgnoringCase(static_cast(object)->getAttribute(aria_hiddenAttr), "true")) return true; object = object->parentObject(); } return false; } bool AccessibilityRenderObject::isDescendantOfBarrenParent() const { for (AccessibilityObject* object = parentObject(); object; object = object->parentObject()) { if (!object->canHaveChildren()) return true; } return false; } bool AccessibilityRenderObject::isAllowedChildOfTree() const { // Determine if this is in a tree. If so, we apply special behavior to make it work like an AXOutline. AccessibilityObject* axObj = parentObject(); bool isInTree = false; while (axObj) { if (axObj->isTree()) { isInTree = true; break; } axObj = axObj->parentObject(); } // If the object is in a tree, only tree items should be exposed (and the children of tree items). if (isInTree) { AccessibilityRole role = roleValue(); if (role != TreeItemRole && role != StaticTextRole) return false; } return true; } AccessibilityObjectInclusion AccessibilityRenderObject::accessibilityIsIgnoredBase() const { // The following cases can apply to any element that's a subclass of AccessibilityRenderObject. // Ignore invisible elements. if (!m_renderer || m_renderer->style()->visibility() != VISIBLE) return IgnoreObject; // Anything marked as aria-hidden or a child of something aria-hidden must be hidden. if (ariaIsHidden()) return IgnoreObject; // Anything that is a presentational role must be hidden. if (isPresentationalChildOfAriaRole()) return IgnoreObject; // Allow the platform to make a decision. AccessibilityObjectInclusion decision = accessibilityPlatformIncludesObject(); if (decision == IncludeObject) return IncludeObject; if (decision == IgnoreObject) return IgnoreObject; return DefaultBehavior; } bool AccessibilityRenderObject::accessibilityIsIgnored() const { // Check first if any of the common reasons cause this element to be ignored. // Then process other use cases that need to be applied to all the various roles // that AccessibilityRenderObjects take on. AccessibilityObjectInclusion decision = accessibilityIsIgnoredBase(); if (decision == IncludeObject) return false; if (decision == IgnoreObject) return true; // If this element is within a parent that cannot have children, it should not be exposed. if (isDescendantOfBarrenParent()) return true; if (roleValue() == IgnoredRole) return true; if (roleValue() == PresentationalRole || inheritsPresentationalRole()) return true; // An ARIA tree can only have tree items and static text as children. if (!isAllowedChildOfTree()) return true; // Allow the platform to decide if the attachment is ignored or not. if (isAttachment()) return accessibilityIgnoreAttachment(); // ignore popup menu items because AppKit does for (RenderObject* parent = m_renderer->parent(); parent; parent = parent->parent()) { if (parent->isBoxModelObject() && toRenderBoxModelObject(parent)->isMenuList()) return true; } // find out if this element is inside of a label element. // if so, it may be ignored because it's the label for a checkbox or radio button AccessibilityObject* controlObject = correspondingControlForLabelElement(); if (controlObject && !controlObject->exposesTitleUIElement() && controlObject->isCheckboxOrRadio()) return true; // NOTE: BRs always have text boxes now, so the text box check here can be removed if (m_renderer->isText()) { // static text beneath MenuItems and MenuButtons are just reported along with the menu item, so it's ignored on an individual level if (parentObjectUnignored()->ariaRoleAttribute() == MenuItemRole || parentObjectUnignored()->ariaRoleAttribute() == MenuButtonRole) return true; RenderText* renderText = toRenderText(m_renderer); if (m_renderer->isBR() || !renderText->firstTextBox()) return true; // static text beneath TextControls is reported along with the text control text so it's ignored. for (AccessibilityObject* parent = parentObject(); parent; parent = parent->parentObject()) { if (parent->roleValue() == TextFieldRole) return true; } // text elements that are just empty whitespace should not be returned return renderText->text()->containsOnlyWhitespace(); } if (isHeading()) return false; if (isLink()) return false; // all controls are accessible if (isControl()) return false; if (ariaRoleAttribute() != UnknownRole) return false; // don't ignore labels, because they serve as TitleUIElements Node* node = m_renderer->node(); if (node && node->hasTagName(labelTag)) return false; // Anything that is content editable should not be ignored. // However, one cannot just call node->rendererIsEditable() since that will ask if its parents // are also editable. Only the top level content editable region should be exposed. if (node && node->isElementNode()) { Element* element = static_cast(node); const AtomicString& contentEditable = element->getAttribute(contenteditableAttr); if (equalIgnoringCase(contentEditable, "true")) return false; } // List items play an important role in defining the structure of lists. They should not be ignored. if (roleValue() == ListItemRole) return false; // if this element has aria attributes on it, it should not be ignored. if (supportsARIAAttributes()) return false; if (m_renderer->isBlockFlow() && m_renderer->childrenInline()) return !toRenderBlock(m_renderer)->firstLineBox() && !mouseButtonListener(); // ignore images seemingly used as spacers if (isImage()) { if (node && node->isElementNode()) { Element* elt = static_cast(node); const AtomicString& alt = elt->getAttribute(altAttr); // don't ignore an image that has an alt tag if (!alt.isEmpty()) return false; // informal standard is to ignore images with zero-length alt strings if (!alt.isNull()) return true; } if (node && node->hasTagName(canvasTag)) { RenderHTMLCanvas* canvas = toRenderHTMLCanvas(m_renderer); if (canvas->height() <= 1 || canvas->width() <= 1) return true; return false; } if (isNativeImage()) { // check for one-dimensional image RenderImage* image = toRenderImage(m_renderer); if (image->height() <= 1 || image->width() <= 1) return true; // check whether rendered image was stretched from one-dimensional file image if (image->cachedImage()) { IntSize imageSize = image->cachedImage()->imageSize(image->view()->zoomFactor()); return imageSize.height() <= 1 || imageSize.width() <= 1; } } return false; } if (isWebArea() || m_renderer->isListMarker()) return false; // Using the help text to decide an element's visibility is not as definitive // as previous checks, so this should remain as one of the last. if (!helpText().isEmpty()) return false; // By default, objects should be ignored so that the AX hierarchy is not // filled with unnecessary items. return true; } bool AccessibilityRenderObject::isLoaded() const { return !m_renderer->document()->parser(); } double AccessibilityRenderObject::estimatedLoadingProgress() const { if (!m_renderer) return 0; if (isLoaded()) return 1.0; Page* page = m_renderer->document()->page(); if (!page) return 0; return page->progress()->estimatedProgress(); } int AccessibilityRenderObject::layoutCount() const { if (!m_renderer->isRenderView()) return 0; return toRenderView(m_renderer)->frameView()->layoutCount(); } String AccessibilityRenderObject::text() const { // If this is a user defined static text, use the accessible name computation. if (ariaRoleAttribute() == StaticTextRole) return ariaAccessibilityDescription(); if (!isTextControl() || isPasswordField()) return String(); if (isNativeTextControl()) return toRenderTextControl(m_renderer)->text(); Node* node = m_renderer->node(); if (!node) return String(); if (!node->isElementNode()) return String(); return static_cast(node)->innerText(); } int AccessibilityRenderObject::textLength() const { ASSERT(isTextControl()); if (isPasswordField()) return -1; // need to return something distinct from 0 return text().length(); } PlainTextRange AccessibilityRenderObject::ariaSelectedTextRange() const { Node* node = m_renderer->node(); if (!node) return PlainTextRange(); ExceptionCode ec = 0; VisibleSelection visibleSelection = selection(); RefPtr currentSelectionRange = visibleSelection.toNormalizedRange(); if (!currentSelectionRange || !currentSelectionRange->intersectsNode(node, ec)) return PlainTextRange(); int start = indexForVisiblePosition(visibleSelection.start()); int end = indexForVisiblePosition(visibleSelection.end()); return PlainTextRange(start, end - start); } String AccessibilityRenderObject::selectedText() const { ASSERT(isTextControl()); if (isPasswordField()) return String(); // need to return something distinct from empty string if (isNativeTextControl()) { RenderTextControl* textControl = toRenderTextControl(m_renderer); return textControl->text().substring(textControl->selectionStart(), textControl->selectionEnd() - textControl->selectionStart()); } if (ariaRoleAttribute() == UnknownRole) return String(); return doAXStringForRange(ariaSelectedTextRange()); } const AtomicString& AccessibilityRenderObject::accessKey() const { Node* node = m_renderer->node(); if (!node) return nullAtom; if (!node->isElementNode()) return nullAtom; return static_cast(node)->getAttribute(accesskeyAttr); } VisibleSelection AccessibilityRenderObject::selection() const { return m_renderer->frame()->selection()->selection(); } PlainTextRange AccessibilityRenderObject::selectedTextRange() const { ASSERT(isTextControl()); if (isPasswordField()) return PlainTextRange(); AccessibilityRole ariaRole = ariaRoleAttribute(); if (isNativeTextControl() && ariaRole == UnknownRole) { RenderTextControl* textControl = toRenderTextControl(m_renderer); return PlainTextRange(textControl->selectionStart(), textControl->selectionEnd() - textControl->selectionStart()); } if (ariaRole == UnknownRole) return PlainTextRange(); return ariaSelectedTextRange(); } void AccessibilityRenderObject::setSelectedTextRange(const PlainTextRange& range) { if (isNativeTextControl()) { setSelectionRange(m_renderer->node(), range.start, range.start + range.length); return; } Document* document = m_renderer->document(); if (!document) return; Frame* frame = document->frame(); if (!frame) return; Node* node = m_renderer->node(); frame->selection()->setSelection(VisibleSelection(Position(node, range.start, Position::PositionIsOffsetInAnchor), Position(node, range.start + range.length, Position::PositionIsOffsetInAnchor), DOWNSTREAM)); } KURL AccessibilityRenderObject::url() const { if (isAnchor() && m_renderer->node()->hasTagName(aTag)) { if (HTMLAnchorElement* anchor = static_cast(anchorElement())) return anchor->href(); } if (isWebArea()) return m_renderer->document()->url(); if (isImage() && m_renderer->node() && m_renderer->node()->hasTagName(imgTag)) return static_cast(m_renderer->node())->src(); if (isInputImage()) return static_cast(m_renderer->node())->src(); return KURL(); } bool AccessibilityRenderObject::isVisited() const { // FIXME: Is it a privacy violation to expose visited information to accessibility APIs? return m_renderer->style()->isLink() && m_renderer->style()->insideLink() == InsideVisitedLink; } void AccessibilityRenderObject::setElementAttributeValue(const QualifiedName& attributeName, bool value) { if (!m_renderer) return; Node* node = m_renderer->node(); if (!node || !node->isElementNode()) return; Element* element = static_cast(node); element->setAttribute(attributeName, (value) ? "true" : "false"); } bool AccessibilityRenderObject::elementAttributeValue(const QualifiedName& attributeName) const { if (!m_renderer) return false; return equalIgnoringCase(getAttribute(attributeName), "true"); } void AccessibilityRenderObject::setIsExpanded(bool isExpanded) { // Combo boxes, tree items and rows can be expanded (in different ways on different platforms). // That action translates into setting the aria-expanded attribute to true. AccessibilityRole role = roleValue(); switch (role) { case ComboBoxRole: case TreeItemRole: case RowRole: setElementAttributeValue(aria_expandedAttr, isExpanded); break; default: break; } } bool AccessibilityRenderObject::isRequired() const { if (equalIgnoringCase(getAttribute(aria_requiredAttr), "true")) return true; Node* n = node(); if (n && (n->isElementNode() && static_cast(n)->isFormControlElement())) return static_cast(n)->required(); return false; } bool AccessibilityRenderObject::isSelected() const { if (!m_renderer) return false; Node* node = m_renderer->node(); if (!node) return false; const AtomicString& ariaSelected = getAttribute(aria_selectedAttr); if (equalIgnoringCase(ariaSelected, "true")) return true; if (isTabItem() && isTabItemSelected()) return true; return false; } bool AccessibilityRenderObject::isTabItemSelected() const { if (!isTabItem() || !m_renderer) return false; Node* node = m_renderer->node(); if (!node || !node->isElementNode()) return false; // The ARIA spec says a tab item can also be selected if it is aria-labeled by a tabpanel // that has keyboard focus inside of it, or if a tabpanel in its aria-controls list has KB // focus inside of it. AccessibilityObject* focusedElement = focusedUIElement(); if (!focusedElement) return false; Vector elements; elementsFromAttribute(elements, aria_controlsAttr); unsigned count = elements.size(); for (unsigned k = 0; k < count; ++k) { Element* element = elements[k]; AccessibilityObject* tabPanel = axObjectCache()->getOrCreate(element->renderer()); // A tab item should only control tab panels. if (!tabPanel || tabPanel->roleValue() != TabPanelRole) continue; AccessibilityObject* checkFocusElement = focusedElement; // Check if the focused element is a descendant of the element controlled by the tab item. while (checkFocusElement) { if (tabPanel == checkFocusElement) return true; checkFocusElement = checkFocusElement->parentObject(); } } return false; } bool AccessibilityRenderObject::isFocused() const { if (!m_renderer) return false; Document* document = m_renderer->document(); if (!document) return false; Node* focusedNode = document->focusedNode(); if (!focusedNode) return false; // A web area is represented by the Document node in the DOM tree, which isn't focusable. // Check instead if the frame's selection controller is focused if (focusedNode == m_renderer->node() || (roleValue() == WebAreaRole && document->frame()->selection()->isFocusedAndActive())) return true; return false; } void AccessibilityRenderObject::setFocused(bool on) { if (!canSetFocusAttribute()) return; if (!on) m_renderer->document()->setFocusedNode(0); else { if (m_renderer->node()->isElementNode()) static_cast(m_renderer->node())->focus(); else m_renderer->document()->setFocusedNode(m_renderer->node()); } } void AccessibilityRenderObject::changeValueByPercent(float percentChange) { float range = maxValueForRange() - minValueForRange(); float value = valueForRange(); value += range * (percentChange / 100); setValue(String::number(value)); axObjectCache()->postNotification(m_renderer, AXObjectCache::AXValueChanged, true); } void AccessibilityRenderObject::setSelected(bool enabled) { setElementAttributeValue(aria_selectedAttr, enabled); } void AccessibilityRenderObject::setSelectedRows(AccessibilityChildrenVector& selectedRows) { // Setting selected only makes sense in trees and tables (and tree-tables). AccessibilityRole role = roleValue(); if (role != TreeRole && role != TreeGridRole && role != TableRole) return; bool isMulti = isMultiSelectable(); unsigned count = selectedRows.size(); if (count > 1 && !isMulti) count = 1; for (unsigned k = 0; k < count; ++k) selectedRows[k]->setSelected(true); } void AccessibilityRenderObject::setValue(const String& string) { if (!m_renderer || !m_renderer->node() || !m_renderer->node()->isElementNode()) return; Element* element = static_cast(m_renderer->node()); if (roleValue() == SliderRole) element->setAttribute(aria_valuenowAttr, string); if (!m_renderer->isBoxModelObject()) return; RenderBoxModelObject* renderer = toRenderBoxModelObject(m_renderer); // FIXME: Do we want to do anything here for ARIA textboxes? if (renderer->isTextField()) { // FIXME: This is not safe! Other elements could have a TextField renderer. static_cast(element)->setValue(string); } else if (renderer->isTextArea()) { // FIXME: This is not safe! Other elements could have a TextArea renderer. static_cast(element)->setValue(string); } } void AccessibilityRenderObject::ariaOwnsElements(AccessibilityChildrenVector& axObjects) const { Vector elements; elementsFromAttribute(elements, aria_ownsAttr); unsigned count = elements.size(); for (unsigned k = 0; k < count; ++k) { RenderObject* render = elements[k]->renderer(); AccessibilityObject* obj = axObjectCache()->getOrCreate(render); if (obj) axObjects.append(obj); } } bool AccessibilityRenderObject::supportsARIAOwns() const { if (!m_renderer) return false; const AtomicString& ariaOwns = getAttribute(aria_ownsAttr); return !ariaOwns.isEmpty(); } bool AccessibilityRenderObject::isEnabled() const { ASSERT(m_renderer); if (equalIgnoringCase(getAttribute(aria_disabledAttr), "true")) return false; Node* node = m_renderer->node(); if (!node || !node->isElementNode()) return true; return static_cast(node)->isEnabledFormControl(); } RenderView* AccessibilityRenderObject::topRenderer() const { return m_renderer->document()->topDocument()->renderView(); } Document* AccessibilityRenderObject::document() const { if (!m_renderer) return 0; return m_renderer->document(); } FrameView* AccessibilityRenderObject::topDocumentFrameView() const { return topRenderer()->view()->frameView(); } Widget* AccessibilityRenderObject::widget() const { if (!m_renderer->isBoxModelObject() || !toRenderBoxModelObject(m_renderer)->isWidget()) return 0; return toRenderWidget(m_renderer)->widget(); } AccessibilityObject* AccessibilityRenderObject::accessibilityParentForImageMap(HTMLMapElement* map) const { // find an image that is using this map if (!map) return 0; HTMLImageElement* imageElement = map->imageElement(); if (!imageElement) return 0; return axObjectCache()->getOrCreate(imageElement->renderer()); } void AccessibilityRenderObject::getDocumentLinks(AccessibilityChildrenVector& result) { Document* document = m_renderer->document(); RefPtr coll = document->links(); Node* curr = coll->firstItem(); while (curr) { RenderObject* obj = curr->renderer(); if (obj) { RefPtr axobj = document->axObjectCache()->getOrCreate(obj); ASSERT(axobj); if (!axobj->accessibilityIsIgnored() && axobj->isLink()) result.append(axobj); } else { Node* parent = curr->parentNode(); if (parent && curr->hasTagName(areaTag) && parent->hasTagName(mapTag)) { AccessibilityImageMapLink* areaObject = static_cast(axObjectCache()->getOrCreate(ImageMapLinkRole)); areaObject->setHTMLAreaElement(static_cast(curr)); areaObject->setHTMLMapElement(static_cast(parent)); areaObject->setParent(accessibilityParentForImageMap(static_cast(parent))); result.append(areaObject); } } curr = coll->nextItem(); } } FrameView* AccessibilityRenderObject::documentFrameView() const { if (!m_renderer || !m_renderer->document()) return 0; // this is the RenderObject's Document's Frame's FrameView return m_renderer->document()->view(); } Widget* AccessibilityRenderObject::widgetForAttachmentView() const { if (!isAttachment()) return 0; return toRenderWidget(m_renderer)->widget(); } FrameView* AccessibilityRenderObject::frameViewIfRenderView() const { if (!m_renderer->isRenderView()) return 0; // this is the RenderObject's Document's renderer's FrameView return m_renderer->view()->frameView(); } // This function is like a cross-platform version of - (WebCoreTextMarkerRange*)textMarkerRange. It returns // a Range that we can convert to a WebCoreTextMarkerRange in the Obj-C file VisiblePositionRange AccessibilityRenderObject::visiblePositionRange() const { if (!m_renderer) return VisiblePositionRange(); // construct VisiblePositions for start and end Node* node = m_renderer->node(); if (!node) return VisiblePositionRange(); VisiblePosition startPos = firstPositionInOrBeforeNode(node); VisiblePosition endPos = lastPositionInOrAfterNode(node); // the VisiblePositions are equal for nodes like buttons, so adjust for that // FIXME: Really? [button, 0] and [button, 1] are distinct (before and after the button) // I expect this code is only hit for things like empty divs? In which case I don't think // the behavior is correct here -- eseidel if (startPos == endPos) { endPos = endPos.next(); if (endPos.isNull()) endPos = startPos; } return VisiblePositionRange(startPos, endPos); } VisiblePositionRange AccessibilityRenderObject::visiblePositionRangeForLine(unsigned lineCount) const { if (!lineCount || !m_renderer) return VisiblePositionRange(); // iterate over the lines // FIXME: this is wrong when lineNumber is lineCount+1, because nextLinePosition takes you to the // last offset of the last line VisiblePosition visiblePos = m_renderer->document()->renderer()->positionForCoordinates(0, 0); VisiblePosition savedVisiblePos; while (--lineCount) { savedVisiblePos = visiblePos; visiblePos = nextLinePosition(visiblePos, 0); if (visiblePos.isNull() || visiblePos == savedVisiblePos) return VisiblePositionRange(); } // make a caret selection for the marker position, then extend it to the line // NOTE: ignores results of sel.modify because it returns false when // starting at an empty line. The resulting selection in that case // will be a caret at visiblePos. SelectionController selection; selection.setSelection(VisibleSelection(visiblePos)); selection.modify(SelectionController::AlterationExtend, DirectionRight, LineBoundary); return VisiblePositionRange(selection.selection().visibleStart(), selection.selection().visibleEnd()); } VisiblePosition AccessibilityRenderObject::visiblePositionForIndex(int index) const { if (!m_renderer) return VisiblePosition(); if (isNativeTextControl()) return toRenderTextControl(m_renderer)->visiblePositionForIndex(index); if (!allowsTextRanges() && !m_renderer->isText()) return VisiblePosition(); Node* node = m_renderer->node(); if (!node) return VisiblePosition(); if (index <= 0) return VisiblePosition(firstPositionInOrBeforeNode(node), DOWNSTREAM); ExceptionCode ec = 0; RefPtr range = Range::create(m_renderer->document()); range->selectNodeContents(node, ec); CharacterIterator it(range.get()); it.advance(index - 1); return VisiblePosition(Position(it.range()->endContainer(ec), it.range()->endOffset(ec), Position::PositionIsOffsetInAnchor), UPSTREAM); } int AccessibilityRenderObject::indexForVisiblePosition(const VisiblePosition& pos) const { if (isNativeTextControl()) return RenderTextControl::indexForVisiblePosition(toRenderTextControl(m_renderer)->innerTextElement(), pos); if (!isTextControl()) return 0; Node* node = m_renderer->node(); if (!node) return 0; Position indexPosition = pos.deepEquivalent(); if (!indexPosition.anchorNode() || indexPosition.anchorNode()->rootEditableElement() != node) return 0; ExceptionCode ec = 0; RefPtr range = Range::create(m_renderer->document()); range->setStart(node, 0, ec); range->setEnd(indexPosition.anchorNode(), indexPosition.deprecatedEditingOffset(), ec); #if PLATFORM(GTK) // We need to consider replaced elements for GTK, as they will be // presented with the 'object replacement character' (0xFFFC). return TextIterator::rangeLength(range.get(), true); #else return TextIterator::rangeLength(range.get()); #endif } IntRect AccessibilityRenderObject::boundsForVisiblePositionRange(const VisiblePositionRange& visiblePositionRange) const { if (visiblePositionRange.isNull()) return IntRect(); // Create a mutable VisiblePositionRange. VisiblePositionRange range(visiblePositionRange); IntRect rect1 = range.start.absoluteCaretBounds(); IntRect rect2 = range.end.absoluteCaretBounds(); // readjust for position at the edge of a line. This is to exclude line rect that doesn't need to be accounted in the range bounds if (rect2.y() != rect1.y()) { VisiblePosition endOfFirstLine = endOfLine(range.start); if (range.start == endOfFirstLine) { range.start.setAffinity(DOWNSTREAM); rect1 = range.start.absoluteCaretBounds(); } if (range.end == endOfFirstLine) { range.end.setAffinity(UPSTREAM); rect2 = range.end.absoluteCaretBounds(); } } IntRect ourrect = rect1; ourrect.unite(rect2); // if the rectangle spans lines and contains multiple text chars, use the range's bounding box intead if (rect1.maxY() != rect2.maxY()) { RefPtr dataRange = makeRange(range.start, range.end); IntRect boundingBox = dataRange->boundingBox(); String rangeString = plainText(dataRange.get()); if (rangeString.length() > 1 && !boundingBox.isEmpty()) ourrect = boundingBox; } #if PLATFORM(MAC) return m_renderer->document()->view()->contentsToScreen(ourrect); #else return ourrect; #endif } void AccessibilityRenderObject::setSelectedVisiblePositionRange(const VisiblePositionRange& range) const { if (range.start.isNull() || range.end.isNull()) return; // make selection and tell the document to use it. if it's zero length, then move to that position if (range.start == range.end) m_renderer->frame()->selection()->moveTo(range.start, true); else { VisibleSelection newSelection = VisibleSelection(range.start, range.end); m_renderer->frame()->selection()->setSelection(newSelection); } } VisiblePosition AccessibilityRenderObject::visiblePositionForPoint(const IntPoint& point) const { if (!m_renderer) return VisiblePosition(); // convert absolute point to view coordinates FrameView* frameView = m_renderer->document()->topDocument()->renderer()->view()->frameView(); RenderView* renderView = topRenderer(); Node* innerNode = 0; // locate the node containing the point IntPoint pointResult; while (1) { IntPoint ourpoint; #if PLATFORM(MAC) ourpoint = frameView->screenToContents(point); #else ourpoint = point; #endif HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active); HitTestResult result(ourpoint); renderView->layer()->hitTest(request, result); innerNode = result.innerNode(); if (!innerNode) return VisiblePosition(); RenderObject* renderer = innerNode->renderer(); if (!renderer) return VisiblePosition(); pointResult = result.localPoint(); // done if hit something other than a widget if (!renderer->isWidget()) break; // descend into widget (FRAME, IFRAME, OBJECT...) Widget* widget = toRenderWidget(renderer)->widget(); if (!widget || !widget->isFrameView()) break; Frame* frame = static_cast(widget)->frame(); if (!frame) break; renderView = frame->document()->renderView(); frameView = static_cast(widget); } return innerNode->renderer()->positionForPoint(pointResult); } // NOTE: Consider providing this utility method as AX API VisiblePosition AccessibilityRenderObject::visiblePositionForIndex(unsigned indexValue, bool lastIndexOK) const { if (!isTextControl()) return VisiblePosition(); // lastIndexOK specifies whether the position after the last character is acceptable if (indexValue >= text().length()) { if (!lastIndexOK || indexValue > text().length()) return VisiblePosition(); } VisiblePosition position = visiblePositionForIndex(indexValue); position.setAffinity(DOWNSTREAM); return position; } // NOTE: Consider providing this utility method as AX API int AccessibilityRenderObject::index(const VisiblePosition& position) const { if (!isTextControl()) return -1; Node* node = position.deepEquivalent().deprecatedNode(); if (!node) return -1; for (RenderObject* renderer = node->renderer(); renderer && renderer->node(); renderer = renderer->parent()) { if (renderer == m_renderer) return indexForVisiblePosition(position); } return -1; } // Given a line number, the range of characters of the text associated with this accessibility // object that contains the line number. PlainTextRange AccessibilityRenderObject::doAXRangeForLine(unsigned lineNumber) const { if (!isTextControl()) return PlainTextRange(); // iterate to the specified line VisiblePosition visiblePos = visiblePositionForIndex(0); VisiblePosition savedVisiblePos; for (unsigned lineCount = lineNumber; lineCount; lineCount -= 1) { savedVisiblePos = visiblePos; visiblePos = nextLinePosition(visiblePos, 0); if (visiblePos.isNull() || visiblePos == savedVisiblePos) return PlainTextRange(); } // Get the end of the line based on the starting position. VisiblePosition endPosition = endOfLine(visiblePos); int index1 = indexForVisiblePosition(visiblePos); int index2 = indexForVisiblePosition(endPosition); // add one to the end index for a line break not caused by soft line wrap (to match AppKit) if (endPosition.affinity() == DOWNSTREAM && endPosition.next().isNotNull()) index2 += 1; // return nil rather than an zero-length range (to match AppKit) if (index1 == index2) return PlainTextRange(); return PlainTextRange(index1, index2 - index1); } // The composed character range in the text associated with this accessibility object that // is specified by the given index value. This parameterized attribute returns the complete // range of characters (including surrogate pairs of multi-byte glyphs) at the given index. PlainTextRange AccessibilityRenderObject::doAXRangeForIndex(unsigned index) const { if (!isTextControl()) return PlainTextRange(); String elementText = text(); if (!elementText.length() || index > elementText.length() - 1) return PlainTextRange(); return PlainTextRange(index, 1); } // A substring of the text associated with this accessibility object that is // specified by the given character range. String AccessibilityRenderObject::doAXStringForRange(const PlainTextRange& range) const { if (isPasswordField()) return String(); if (!range.length) return String(); if (!isTextControl()) return String(); String elementText = text(); if (range.start + range.length > elementText.length()) return String(); return elementText.substring(range.start, range.length); } // The bounding rectangle of the text associated with this accessibility object that is // specified by the given range. This is the bounding rectangle a sighted user would see // on the display screen, in pixels. IntRect AccessibilityRenderObject::doAXBoundsForRange(const PlainTextRange& range) const { if (allowsTextRanges()) return boundsForVisiblePositionRange(visiblePositionRangeForRange(range)); return IntRect(); } AccessibilityObject* AccessibilityRenderObject::accessibilityImageMapHitTest(HTMLAreaElement* area, const IntPoint& point) const { if (!area) return 0; HTMLMapElement* map = static_cast(area->parentNode()); AccessibilityObject* parent = accessibilityParentForImageMap(map); if (!parent) return 0; AccessibilityObject::AccessibilityChildrenVector children = parent->children(); unsigned count = children.size(); for (unsigned k = 0; k < count; ++k) { if (children[k]->elementRect().contains(point)) return children[k].get(); } return 0; } AccessibilityObject* AccessibilityRenderObject::accessibilityHitTest(const IntPoint& point) const { if (!m_renderer || !m_renderer->hasLayer()) return 0; RenderLayer* layer = toRenderBox(m_renderer)->layer(); HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active); HitTestResult hitTestResult = HitTestResult(point); layer->hitTest(request, hitTestResult); if (!hitTestResult.innerNode()) return 0; Node* node = hitTestResult.innerNode()->shadowAncestorNode(); if (node->hasTagName(areaTag)) return accessibilityImageMapHitTest(static_cast(node), point); if (node->hasTagName(optionTag)) node = static_cast(node)->ownerSelectElement(); RenderObject* obj = node->renderer(); if (!obj) return 0; AccessibilityObject* result = obj->document()->axObjectCache()->getOrCreate(obj); result->updateChildrenIfNecessary(); // Allow the element to perform any hit-testing it might need to do to reach non-render children. result = result->elementAccessibilityHitTest(point); if (result->accessibilityIsIgnored()) { // If this element is the label of a control, a hit test should return the control. AccessibilityObject* controlObject = result->correspondingControlForLabelElement(); if (controlObject && !controlObject->exposesTitleUIElement()) return controlObject; result = result->parentObjectUnignored(); } return result; } bool AccessibilityRenderObject::shouldFocusActiveDescendant() const { switch (ariaRoleAttribute()) { case GroupRole: case ComboBoxRole: case ListBoxRole: case MenuRole: case MenuBarRole: case RadioGroupRole: case RowRole: case PopUpButtonRole: case ProgressIndicatorRole: case ToolbarRole: case OutlineRole: case TreeRole: case GridRole: /* FIXME: replace these with actual roles when they are added to AccessibilityRole composite alert alertdialog status timer */ return true; default: return false; } } AccessibilityObject* AccessibilityRenderObject::activeDescendant() const { if (!m_renderer) return 0; if (m_renderer->node() && !m_renderer->node()->isElementNode()) return 0; Element* element = static_cast(m_renderer->node()); const AtomicString& activeDescendantAttrStr = element->getAttribute(aria_activedescendantAttr); if (activeDescendantAttrStr.isNull() || activeDescendantAttrStr.isEmpty()) return 0; Element* target = document()->getElementById(activeDescendantAttrStr); if (!target) return 0; AccessibilityObject* obj = axObjectCache()->getOrCreate(target->renderer()); if (obj && obj->isAccessibilityRenderObject()) // an activedescendant is only useful if it has a renderer, because that's what's needed to post the notification return obj; return 0; } void AccessibilityRenderObject::handleAriaExpandedChanged() { // Find if a parent of this object should handle aria-expanded changes. AccessibilityObject* containerParent = this->parentObject(); while (containerParent) { bool foundParent = false; switch (containerParent->roleValue()) { case TreeRole: case TreeGridRole: case GridRole: case TableRole: case BrowserRole: foundParent = true; break; default: break; } if (foundParent) break; containerParent = containerParent->parentObject(); } // Post that the row count changed. if (containerParent) axObjectCache()->postNotification(containerParent, document(), AXObjectCache::AXRowCountChanged, true); // Post that the specific row either collapsed or expanded. if (roleValue() == RowRole || roleValue() == TreeItemRole) axObjectCache()->postNotification(this, document(), isExpanded() ? AXObjectCache::AXRowExpanded : AXObjectCache::AXRowCollapsed, true); } void AccessibilityRenderObject::handleActiveDescendantChanged() { Element* element = static_cast(renderer()->node()); if (!element) return; Document* doc = renderer()->document(); if (!doc->frame()->selection()->isFocusedAndActive() || doc->focusedNode() != element) return; AccessibilityRenderObject* activedescendant = static_cast(activeDescendant()); if (activedescendant && shouldFocusActiveDescendant()) doc->axObjectCache()->postNotification(m_renderer, AXObjectCache::AXActiveDescendantChanged, true); } AccessibilityObject* AccessibilityRenderObject::correspondingControlForLabelElement() const { HTMLLabelElement* labelElement = labelElementContainer(); if (!labelElement) return 0; HTMLElement* correspondingControl = labelElement->control(); if (!correspondingControl) return 0; return axObjectCache()->getOrCreate(correspondingControl->renderer()); } AccessibilityObject* AccessibilityRenderObject::correspondingLabelForControlElement() const { if (!m_renderer) return 0; Node* node = m_renderer->node(); if (node && node->isHTMLElement()) { HTMLLabelElement* label = labelForElement(static_cast(node)); if (label) return axObjectCache()->getOrCreate(label->renderer()); } return 0; } bool AccessibilityRenderObject::renderObjectIsObservable(RenderObject* renderer) const { // AX clients will listen for AXValueChange on a text control. if (renderer->isTextControl()) return true; // AX clients will listen for AXSelectedChildrenChanged on listboxes. Node* node = renderer->node(); if (nodeHasRole(node, "listbox") || (renderer->isBoxModelObject() && toRenderBoxModelObject(renderer)->isListBox())) return true; // Textboxes should send out notifications. if (nodeHasRole(node, "textbox")) return true; return false; } AccessibilityObject* AccessibilityRenderObject::observableObject() const { // Find the object going up the parent chain that is used in accessibility to monitor certain notifications. for (RenderObject* renderer = m_renderer; renderer && renderer->node(); renderer = renderer->parent()) { if (renderObjectIsObservable(renderer)) return axObjectCache()->getOrCreate(renderer); } return 0; } AccessibilityRole AccessibilityRenderObject::determineAriaRoleAttribute() const { const AtomicString& ariaRole = getAttribute(roleAttr); if (ariaRole.isNull() || ariaRole.isEmpty()) return UnknownRole; AccessibilityRole role = ariaRoleToWebCoreRole(ariaRole); if (role == ButtonRole && ariaHasPopup()) role = PopUpButtonRole; if (role == TextAreaRole && ariaIsMultiline()) role = TextFieldRole; if (role) return role; AccessibilityObject* parentObject = parentObjectUnignored(); if (!parentObject) return UnknownRole; AccessibilityRole parentAriaRole = parentObject->ariaRoleAttribute(); // selects and listboxes both have options as child roles, but they map to different roles within WebCore if (equalIgnoringCase(ariaRole, "option")) { if (parentAriaRole == MenuRole) return MenuItemRole; if (parentAriaRole == ListBoxRole) return ListBoxOptionRole; } // an aria "menuitem" may map to MenuButton or MenuItem depending on its parent if (equalIgnoringCase(ariaRole, "menuitem")) { if (parentAriaRole == GroupRole) return MenuButtonRole; if (parentAriaRole == MenuRole || parentAriaRole == MenuBarRole) return MenuItemRole; } return UnknownRole; } AccessibilityRole AccessibilityRenderObject::ariaRoleAttribute() const { return m_ariaRole; } void AccessibilityRenderObject::updateAccessibilityRole() { bool ignoredStatus = accessibilityIsIgnored(); m_role = determineAccessibilityRole(); // The AX hierarchy only needs to be updated if the ignored status of an element has changed. if (ignoredStatus != accessibilityIsIgnored()) childrenChanged(); } AccessibilityRole AccessibilityRenderObject::determineAccessibilityRole() { if (!m_renderer) return UnknownRole; m_ariaRole = determineAriaRoleAttribute(); Node* node = m_renderer->node(); AccessibilityRole ariaRole = ariaRoleAttribute(); if (ariaRole != UnknownRole) return ariaRole; RenderBoxModelObject* cssBox = renderBoxModelObject(); if (node && node->isLink()) { if (cssBox && cssBox->isImage()) return ImageMapRole; return WebCoreLinkRole; } if (cssBox && cssBox->isListItem()) return ListItemRole; if (m_renderer->isListMarker()) return ListMarkerRole; if (node && node->hasTagName(buttonTag)) return ButtonRole; if (m_renderer->isText()) return StaticTextRole; if (cssBox && cssBox->isImage()) { if (node && node->hasTagName(inputTag)) return ButtonRole; return ImageRole; } if (node && node->hasTagName(canvasTag)) return ImageRole; if (cssBox && cssBox->isRenderView()) return WebAreaRole; if (cssBox && cssBox->isTextField()) return TextFieldRole; if (cssBox && cssBox->isTextArea()) return TextAreaRole; if (node && node->hasTagName(inputTag)) { HTMLInputElement* input = static_cast(node); if (input->isCheckbox()) return CheckBoxRole; if (input->isRadioButton()) return RadioButtonRole; if (input->isTextButton()) return ButtonRole; } if (node && node->hasTagName(buttonTag)) return ButtonRole; if (isFileUploadButton()) return ButtonRole; if (cssBox && cssBox->isMenuList()) return PopUpButtonRole; if (headingLevel()) return HeadingRole; #if ENABLE(MATHML) if (node && node->hasTagName(MathMLNames::mathTag)) return DocumentMathRole; #endif if (node && node->hasTagName(ddTag)) return DefinitionListDefinitionRole; if (node && node->hasTagName(dtTag)) return DefinitionListTermRole; if (node && (node->hasTagName(rpTag) || node->hasTagName(rtTag))) return AnnotationRole; #if PLATFORM(GTK) // Gtk ATs expect all tables, data and layout, to be exposed as tables. if (node && (node->hasTagName(tdTag) || node->hasTagName(thTag))) return CellRole; if (node && node->hasTagName(trTag)) return RowRole; if (node && node->hasTagName(tableTag)) return TableRole; #endif // Table sections should be ignored. if (m_renderer->isTableSection()) return IgnoredRole; #if PLATFORM(GTK) if (m_renderer->isHR()) return SplitterRole; if (node && node->hasTagName(pTag)) return ParagraphRole; if (node && node->hasTagName(labelTag)) return LabelRole; if (node && node->hasTagName(divTag)) return DivRole; if (node && node->hasTagName(formTag)) return FormRole; #else if (node && node->hasTagName(labelTag)) return GroupRole; #endif if (m_renderer->isBlockFlow()) return GroupRole; // If the element does not have role, but it has ARIA attributes, accessibility should fallback to exposing it as a group. if (supportsARIAAttributes()) return GroupRole; return UnknownRole; } AccessibilityOrientation AccessibilityRenderObject::orientation() const { const AtomicString& ariaOrientation = getAttribute(aria_orientationAttr); if (equalIgnoringCase(ariaOrientation, "horizontal")) return AccessibilityOrientationHorizontal; if (equalIgnoringCase(ariaOrientation, "vertical")) return AccessibilityOrientationVertical; return AccessibilityObject::orientation(); } bool AccessibilityRenderObject::inheritsPresentationalRole() const { // ARIA spec says that when a parent object is presentational, and it has required child elements, // those child elements are also presentational. For example,
  • becomes presentational from
      . // http://www.w3.org/WAI/PF/aria/complete#presentation DEFINE_STATIC_LOCAL(HashSet, listItemParents, ()); HashSet* possibleParentTagNames = 0; switch (roleValue()) { case ListItemRole: case ListMarkerRole: if (listItemParents.isEmpty()) { listItemParents.add(ulTag); listItemParents.add(olTag); listItemParents.add(dlTag); } possibleParentTagNames = &listItemParents; break; default: break; } // Not all elements need to check for this, only ones that are required children. if (!possibleParentTagNames) return false; for (AccessibilityObject* parent = parentObject(); parent; parent = parent->parentObject()) { if (!parent->isAccessibilityRenderObject()) continue; Node* elementNode = static_cast(parent)->node(); if (!elementNode || !elementNode->isElementNode()) continue; // If native tag of the parent element matches an acceptable name, then return // based on its presentational status. if (possibleParentTagNames->contains(static_cast(elementNode)->tagQName())) return parent->roleValue() == PresentationalRole; } return false; } bool AccessibilityRenderObject::isPresentationalChildOfAriaRole() const { // Walk the parent chain looking for a parent that has presentational children AccessibilityObject* parent; for (parent = parentObject(); parent && !parent->ariaRoleHasPresentationalChildren(); parent = parent->parentObject()) { } return parent; } bool AccessibilityRenderObject::ariaRoleHasPresentationalChildren() const { switch (m_ariaRole) { case ButtonRole: case SliderRole: case ImageRole: case ProgressIndicatorRole: // case SeparatorRole: return true; default: return false; } } bool AccessibilityRenderObject::canSetFocusAttribute() const { ASSERT(m_renderer); Node* node = m_renderer->node(); // NOTE: It would be more accurate to ask the document whether setFocusedNode() would // do anything. For example, setFocusedNode() will do nothing if the current focused // node will not relinquish the focus. if (!node || !node->isElementNode()) return false; if (!static_cast(node)->isEnabledFormControl()) return false; switch (roleValue()) { case WebCoreLinkRole: case ImageMapLinkRole: case TextFieldRole: case TextAreaRole: case ButtonRole: case PopUpButtonRole: case CheckBoxRole: case RadioButtonRole: case SliderRole: return true; default: return node->supportsFocus(); } } bool AccessibilityRenderObject::canSetExpandedAttribute() const { // An object can be expanded if it aria-expanded is true or false. const AtomicString& ariaExpanded = getAttribute(aria_expandedAttr); return equalIgnoringCase(ariaExpanded, "true") || equalIgnoringCase(ariaExpanded, "false"); } bool AccessibilityRenderObject::canSetValueAttribute() const { if (equalIgnoringCase(getAttribute(aria_readonlyAttr), "true")) return false; // Any node could be contenteditable, so isReadOnly should be relied upon // for this information for all elements. return isProgressIndicator() || isSlider() || !isReadOnly(); } bool AccessibilityRenderObject::canSetTextRangeAttributes() const { return isTextControl(); } void AccessibilityRenderObject::contentChanged() { // If this element supports ARIA live regions, then notify the AT of changes. AXObjectCache* cache = axObjectCache(); for (RenderObject* renderParent = m_renderer; renderParent; renderParent = renderParent->parent()) { AccessibilityObject* parent = cache->get(renderParent); if (!parent) continue; // If we find a parent that has ARIA live region on, send the notification and stop processing. // The spec does not talk about nested live regions. if (parent->supportsARIALiveRegion()) { axObjectCache()->postNotification(renderParent, AXObjectCache::AXLiveRegionChanged, true); break; } } } void AccessibilityRenderObject::childrenChanged() { // This method is meant as a quick way of marking a portion of the accessibility tree dirty. if (!m_renderer) return; bool sentChildrenChanged = false; // Go up the accessibility parent chain, but only if the element already exists. This method is // called during render layouts, minimal work should be done. // If AX elements are created now, they could interrogate the render tree while it's in a funky state. // At the same time, process ARIA live region changes. for (AccessibilityObject* parent = this; parent; parent = parent->parentObjectIfExists()) { if (!parent->isAccessibilityRenderObject()) continue; AccessibilityRenderObject* axParent = static_cast(parent); // Send the children changed notification on the first accessibility render object ancestor. if (!sentChildrenChanged) { axObjectCache()->postNotification(axParent->renderer(), AXObjectCache::AXChildrenChanged, true); sentChildrenChanged = true; } // Only do work if the children haven't been marked dirty. This has the effect of blocking // future live region change notifications until the AX tree has been accessed again. This // is a good performance win for all parties. if (!axParent->needsToUpdateChildren()) { axParent->setNeedsToUpdateChildren(); // If this element supports ARIA live regions, then notify the AT of changes. if (axParent->supportsARIALiveRegion()) axObjectCache()->postNotification(axParent->renderer(), AXObjectCache::AXLiveRegionChanged, true); } } } bool AccessibilityRenderObject::canHaveChildren() const { if (!m_renderer) return false; // Elements that should not have children switch (roleValue()) { case ImageRole: case ButtonRole: case PopUpButtonRole: case CheckBoxRole: case RadioButtonRole: case TabRole: case StaticTextRole: case ListBoxOptionRole: case ScrollBarRole: return false; default: return true; } } void AccessibilityRenderObject::clearChildren() { AccessibilityObject::clearChildren(); m_childrenDirty = false; } void AccessibilityRenderObject::updateChildrenIfNecessary() { if (needsToUpdateChildren()) clearChildren(); AccessibilityObject::updateChildrenIfNecessary(); } const AccessibilityObject::AccessibilityChildrenVector& AccessibilityRenderObject::children() { updateChildrenIfNecessary(); return m_children; } void AccessibilityRenderObject::addChildren() { // If the need to add more children in addition to existing children arises, // childrenChanged should have been called, leaving the object with no children. ASSERT(!m_haveChildren); // nothing to add if there is no RenderObject if (!m_renderer) return; m_haveChildren = true; if (!canHaveChildren()) return; // add all unignored acc children for (RefPtr obj = firstChild(); obj; obj = obj->nextSibling()) { if (obj->accessibilityIsIgnored()) { obj->updateChildrenIfNecessary(); AccessibilityChildrenVector children = obj->children(); unsigned length = children.size(); for (unsigned i = 0; i < length; ++i) m_children.append(children[i]); } else { ASSERT(obj->parentObject() == this); m_children.append(obj); } } // FrameView's need to be inserted into the AX hierarchy when encountered. if (isAttachment()) { Widget* widget = widgetForAttachmentView(); if (widget && widget->isFrameView()) m_children.append(axObjectCache()->getOrCreate(widget)); } // for a RenderImage, add the elements as individual accessibility objects RenderBoxModelObject* cssBox = renderBoxModelObject(); if (cssBox && cssBox->isRenderImage()) { HTMLMapElement* map = toRenderImage(cssBox)->imageMap(); if (map) { for (Node* current = map->firstChild(); current; current = current->traverseNextNode(map)) { // add an element for this child if it has a link if (current->hasTagName(areaTag) && current->isLink()) { AccessibilityImageMapLink* areaObject = static_cast(axObjectCache()->getOrCreate(ImageMapLinkRole)); areaObject->setHTMLAreaElement(static_cast(current)); areaObject->setHTMLMapElement(map); areaObject->setParent(this); m_children.append(areaObject); } } } } } const AtomicString& AccessibilityRenderObject::ariaLiveRegionStatus() const { DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusAssertive, ("assertive")); DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusPolite, ("polite")); DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusOff, ("off")); const AtomicString& liveRegionStatus = getAttribute(aria_liveAttr); // These roles have implicit live region status. if (liveRegionStatus.isEmpty()) { switch (roleValue()) { case ApplicationAlertDialogRole: case ApplicationAlertRole: return liveRegionStatusAssertive; case ApplicationLogRole: case ApplicationStatusRole: return liveRegionStatusPolite; case ApplicationTimerRole: case ApplicationMarqueeRole: return liveRegionStatusOff; default: break; } } return liveRegionStatus; } const AtomicString& AccessibilityRenderObject::ariaLiveRegionRelevant() const { DEFINE_STATIC_LOCAL(const AtomicString, defaultLiveRegionRelevant, ("additions text")); const AtomicString& relevant = getAttribute(aria_relevantAttr); // Default aria-relevant = "additions text". if (relevant.isEmpty()) return defaultLiveRegionRelevant; return relevant; } bool AccessibilityRenderObject::ariaLiveRegionAtomic() const { return elementAttributeValue(aria_atomicAttr); } bool AccessibilityRenderObject::ariaLiveRegionBusy() const { return elementAttributeValue(aria_busyAttr); } void AccessibilityRenderObject::ariaSelectedRows(AccessibilityChildrenVector& result) { // Get all the rows. AccessibilityChildrenVector allRows; ariaTreeRows(allRows); // Determine which rows are selected. bool isMulti = isMultiSelectable(); // Prefer active descendant over aria-selected. AccessibilityObject* activeDesc = activeDescendant(); if (activeDesc && (activeDesc->isTreeItem() || activeDesc->isTableRow())) { result.append(activeDesc); if (!isMulti) return; } unsigned count = allRows.size(); for (unsigned k = 0; k < count; ++k) { if (allRows[k]->isSelected()) { result.append(allRows[k]); if (!isMulti) break; } } } void AccessibilityRenderObject::ariaListboxSelectedChildren(AccessibilityChildrenVector& result) { bool isMulti = isMultiSelectable(); AccessibilityChildrenVector childObjects = children(); unsigned childrenSize = childObjects.size(); for (unsigned k = 0; k < childrenSize; ++k) { // Every child should have aria-role option, and if so, check for selected attribute/state. AccessibilityObject* child = childObjects[k].get(); if (child->isSelected() && child->ariaRoleAttribute() == ListBoxOptionRole) { result.append(child); if (!isMulti) return; } } } void AccessibilityRenderObject::selectedChildren(AccessibilityChildrenVector& result) { ASSERT(result.isEmpty()); // only listboxes should be asked for their selected children. AccessibilityRole role = roleValue(); if (role == ListBoxRole) // native list boxes would be AccessibilityListBoxes, so only check for aria list boxes ariaListboxSelectedChildren(result); else if (role == TreeRole || role == TreeGridRole || role == TableRole) ariaSelectedRows(result); } void AccessibilityRenderObject::ariaListboxVisibleChildren(AccessibilityChildrenVector& result) { if (!hasChildren()) addChildren(); unsigned length = m_children.size(); for (unsigned i = 0; i < length; i++) { if (!m_children[i]->isOffScreen()) result.append(m_children[i]); } } void AccessibilityRenderObject::visibleChildren(AccessibilityChildrenVector& result) { ASSERT(result.isEmpty()); // only listboxes are asked for their visible children. if (ariaRoleAttribute() != ListBoxRole) { // native list boxes would be AccessibilityListBoxes, so only check for aria list boxes ASSERT_NOT_REACHED(); return; } return ariaListboxVisibleChildren(result); } void AccessibilityRenderObject::tabChildren(AccessibilityChildrenVector& result) { ASSERT(roleValue() == TabListRole); unsigned length = m_children.size(); for (unsigned i = 0; i < length; ++i) { if (m_children[i]->isTabItem()) result.append(m_children[i]); } } const String& AccessibilityRenderObject::actionVerb() const { // FIXME: Need to add verbs for select elements. DEFINE_STATIC_LOCAL(const String, buttonAction, (AXButtonActionVerb())); DEFINE_STATIC_LOCAL(const String, textFieldAction, (AXTextFieldActionVerb())); DEFINE_STATIC_LOCAL(const String, radioButtonAction, (AXRadioButtonActionVerb())); DEFINE_STATIC_LOCAL(const String, checkedCheckBoxAction, (AXCheckedCheckBoxActionVerb())); DEFINE_STATIC_LOCAL(const String, uncheckedCheckBoxAction, (AXUncheckedCheckBoxActionVerb())); DEFINE_STATIC_LOCAL(const String, linkAction, (AXLinkActionVerb())); DEFINE_STATIC_LOCAL(const String, noAction, ()); switch (roleValue()) { case ButtonRole: return buttonAction; case TextFieldRole: case TextAreaRole: return textFieldAction; case RadioButtonRole: return radioButtonAction; case CheckBoxRole: return isChecked() ? checkedCheckBoxAction : uncheckedCheckBoxAction; case LinkRole: case WebCoreLinkRole: return linkAction; default: return noAction; } } void AccessibilityRenderObject::setAccessibleName(String& name) { // Setting the accessible name can store the value in the DOM if (!m_renderer) return; Node* domNode = 0; // For web areas, set the aria-label on the HTML element. if (isWebArea()) domNode = m_renderer->document()->documentElement(); else domNode = m_renderer->node(); if (domNode && domNode->isElementNode()) static_cast(domNode)->setAttribute(aria_labelAttr, name); } void AccessibilityRenderObject::updateBackingStore() { if (!m_renderer) return; // Updating layout may delete m_renderer and this object. m_renderer->document()->updateLayoutIgnorePendingStylesheets(); } static bool isLinkable(const AccessibilityRenderObject& object) { if (!object.renderer()) return false; // See https://wiki.mozilla.org/Accessibility/AT-Windows-API for the elements // Mozilla considers linkable. return object.isLink() || object.isImage() || object.renderer()->isText(); } String AccessibilityRenderObject::stringValueForMSAA() const { if (isLinkable(*this)) { Element* anchor = anchorElement(); if (anchor && anchor->hasTagName(aTag)) return static_cast(anchor)->href(); } return stringValue(); } bool AccessibilityRenderObject::isLinked() const { if (!isLinkable(*this)) return false; Element* anchor = anchorElement(); if (!anchor || !anchor->hasTagName(aTag)) return false; return !static_cast(anchor)->href().isEmpty(); } String AccessibilityRenderObject::nameForMSAA() const { if (m_renderer && m_renderer->isText()) return textUnderElement(); return title(); } static bool shouldReturnTagNameAsRoleForMSAA(const Element& element) { // See "document structure", // https://wiki.mozilla.org/Accessibility/AT-Windows-API // FIXME: Add the other tag names that should be returned as the role. return element.hasTagName(h1Tag) || element.hasTagName(h2Tag) || element.hasTagName(h3Tag) || element.hasTagName(h4Tag) || element.hasTagName(h5Tag) || element.hasTagName(h6Tag); } String AccessibilityRenderObject::stringRoleForMSAA() const { if (!m_renderer) return String(); Node* node = m_renderer->node(); if (!node || !node->isElementNode()) return String(); Element* element = static_cast(node); if (!shouldReturnTagNameAsRoleForMSAA(*element)) return String(); return element->tagName(); } String AccessibilityRenderObject::positionalDescriptionForMSAA() const { // See "positional descriptions", // https://wiki.mozilla.org/Accessibility/AT-Windows-API if (isHeading()) return "L" + String::number(headingLevel()); // FIXME: Add positional descriptions for other elements. return String(); } String AccessibilityRenderObject::descriptionForMSAA() const { String description = positionalDescriptionForMSAA(); if (!description.isEmpty()) return description; description = accessibilityDescription(); if (!description.isEmpty()) { // From the Mozilla MSAA implementation: // "Signal to screen readers that this description is speakable and is not // a formatted positional information description. Don't localize the // 'Description: ' part of this string, it will be parsed out by assistive // technologies." return "Description: " + description; } return String(); } static AccessibilityRole msaaRoleForRenderer(const RenderObject* renderer) { if (!renderer) return UnknownRole; if (renderer->isText()) return EditableTextRole; if (renderer->isBoxModelObject() && toRenderBoxModelObject(renderer)->isListItem()) return ListItemRole; return UnknownRole; } AccessibilityRole AccessibilityRenderObject::roleValueForMSAA() const { if (m_roleForMSAA != UnknownRole) return m_roleForMSAA; m_roleForMSAA = msaaRoleForRenderer(m_renderer); if (m_roleForMSAA == UnknownRole) m_roleForMSAA = roleValue(); return m_roleForMSAA; } } // namespace WebCore