/* * 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 "AccessibilitySVGRoot.h" #include "AccessibilitySpinButton.h" #include "AccessibilityTable.h" #include "CachedImage.h" #include "Chrome.h" #include "EventNames.h" #include "FloatRect.h" #include "Frame.h" #include "FrameLoader.h" #include "FrameSelection.h" #include "HTMLAreaElement.h" #include "HTMLFormElement.h" #include "HTMLFrameElementBase.h" #include "HTMLImageElement.h" #include "HTMLInputElement.h" #include "HTMLLabelElement.h" #include "HTMLMapElement.h" #include "HTMLNames.h" #include "HTMLOptGroupElement.h" #include "HTMLOptionElement.h" #include "HTMLOptionsCollection.h" #include "HTMLSelectElement.h" #include "HTMLTableElement.h" #include "HTMLTextAreaElement.h" #include "HitTestRequest.h" #include "HitTestResult.h" #include "Image.h" #include "LocalizedStrings.h" #include "MathMLNames.h" #include "NodeList.h" #include "NodeTraversal.h" #include "Page.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 "RenderMathMLBlock.h" #include "RenderMathMLFraction.h" #include "RenderMathMLOperator.h" #include "RenderMenuList.h" #include "RenderSVGShape.h" #include "RenderText.h" #include "RenderTextControl.h" #include "RenderTextControlSingleLine.h" #include "RenderTextFragment.h" #include "RenderTheme.h" #include "RenderView.h" #include "RenderWidget.h" #include "RenderedPosition.h" #include "SVGDocument.h" #include "SVGImage.h" #include "SVGImageChromeClient.h" #include "SVGNames.h" #include "SVGSVGElement.h" #include "Text.h" #include "TextControlInnerElements.h" #include "VisibleUnits.h" #include "htmlediting.h" #include #include #include using namespace std; namespace WebCore { using namespace HTMLNames; AccessibilityRenderObject::AccessibilityRenderObject(RenderObject* renderer) : AccessibilityNodeObject(renderer->node()) , m_renderer(renderer) { #ifndef NDEBUG m_renderer->setHasAXObject(true); #endif } AccessibilityRenderObject::~AccessibilityRenderObject() { ASSERT(isDetached()); } void AccessibilityRenderObject::init() { AccessibilityNodeObject::init(); } PassRefPtr AccessibilityRenderObject::create(RenderObject* renderer) { return adoptRef(new AccessibilityRenderObject(renderer)); } void AccessibilityRenderObject::detach() { AccessibilityNodeObject::detach(); detachRemoteSVGRoot(); #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); } void AccessibilityRenderObject::setRenderer(RenderObject* renderer) { m_renderer = renderer; setNode(renderer->node()); } 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_UNUSED(prev, 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 an object can't have children, then it is using this method to help // calculate some internal property (like its description). // In this case, it should check the Node level for children in case they're // not rendered (like a element). if (!firstChild && !canHaveChildren()) return AccessibilityNodeObject::firstChild(); return axObjectCache()->getOrCreate(firstChild); } AccessibilityObject* AccessibilityRenderObject::lastChild() const { if (!m_renderer) return 0; RenderObject* lastChild = lastChildConsideringContinuation(m_renderer); if (!lastChild && !canHaveChildren()) return AccessibilityNodeObject::lastChild(); return axObjectCache()->getOrCreate(lastChild); } static inline RenderInline* startOfContinuations(RenderObject* r) { if (r->isInlineElementContinuation()) { #if ENABLE(MATHML) // MathML elements make anonymous RenderObjects, then set their node to the parent's node. // This makes it so that the renderer() != renderer()->node()->renderer() // (which is what isInlineElementContinuation() uses as a determinant). if (r->node()->isElementNode() && toElement(r->node())->isMathMLElement()) return 0; #endif 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)) { RenderObject* firstParent = startOfContinuations(m_renderer->firstChild())->parent(); while (firstChildIsInlineContinuation(firstParent)) firstParent = startOfContinuations(firstParent->firstChild())->parent(); previousSibling = firstParent->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)) { RenderObject* lastParent = endOfContinuations(m_renderer->lastChild())->parent(); while (lastChildHasContinuation(lastParent)) lastParent = endOfContinuations(lastParent->lastChild())->parent(); nextSibling = lastParent->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(); while (nodeRenderFirstChild != firstChild) { for (RenderObject* contsTest = nodeRenderFirstChild; contsTest; contsTest = nextContinuation(contsTest)) { if (contsTest == firstChild) { parent = nodeRenderFirstChild->parent(); break; } } if (firstChild == parent->firstChild()) break; firstChild = parent->firstChild(); if (!firstChild->node()) break; nodeRenderFirstChild = firstChild->node()->renderer(); } } return parent; } AccessibilityObject* AccessibilityRenderObject::parentObjectIfExists() const { // WebArea's parent should be the scroll view containing it. if (isWebArea() || isSeamlessWebArea()) return axObjectCache()->get(m_renderer->frame()->view()); 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() || isSeamlessWebArea()) return axObjectCache()->getOrCreate(m_renderer->frame()->view()); return 0; } 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(); return isWidget && ariaRoleAttribute() == UnknownRole; } bool AccessibilityRenderObject::isFileUploadButton() const { if (m_renderer && m_renderer->node() && isHTMLInputElement(m_renderer->node())) { HTMLInputElement* input = toHTMLInputElement(m_renderer->node()); return input->isFileUpload(); } return false; } 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->rendererIsEditable()) return false; return !document->rendererIsEditable(); } return AccessibilityNodeObject::isReadOnly(); } bool AccessibilityRenderObject::isOffScreen() const { ASSERT(m_renderer); IntRect contentRect = pixelSnappedIntRect(m_renderer->absoluteClippedOverflowRect()); FrameView* view = m_renderer->frame()->view(); IntRect viewRect = view->visibleContentRect(); viewRect.intersect(contentRect); return viewRect.isEmpty(); } 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 (isHTMLAnchorElement(node) || (node->renderer() && cache->getOrCreate(node->renderer())->isAnchor())) return toElement(node); } return 0; } String AccessibilityRenderObject::helpText() const { if (!m_renderer) return String(); const AtomicString& ariaHelp = getAttribute(aria_helpAttr); if (!ariaHelp.isEmpty()) return ariaHelp; String describedBy = ariaDescribedByAttribute(); if (!describedBy.isEmpty()) return describedBy; String description = accessibilityDescription(); for (RenderObject* curr = m_renderer; curr; curr = curr->parent()) { if (curr->node() && curr->node()->isHTMLElement()) { const AtomicString& summary = toElement(curr->node())->getAttribute(summaryAttr); if (!summary.isEmpty()) return summary; // The title attribute should be used as help text unless it is already being used as descriptive text. const AtomicString& title = toElement(curr->node())->getAttribute(titleAttr); if (!title.isEmpty() && description != title) 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(); } String AccessibilityRenderObject::textUnderElement(AccessibilityTextUnderElementMode mode) const { if (!m_renderer) return String(); if (m_renderer->isFileUploadControl()) return toRenderFileUploadControl(m_renderer)->buttonValue(); #if ENABLE(MATHML) // Math operators create RenderText nodes on the fly that are not tied into the DOM in a reasonable way, // so rangeOfContents does not work for them (nor does regular text selection). if (m_renderer->isText() && isMathElement()) { for (RenderObject* parent = m_renderer->parent(); parent; parent = parent->parent()) { if (parent->isRenderMathMLBlock() && toRenderMathMLBlock(parent)->isRenderMathMLOperator()) return toRenderText(m_renderer)->text(); } } #endif // We use a text iterator for text objects AND for those cases where we are // explicitly asking for the full text under a given element. if (m_renderer->isText() || mode == TextUnderElementModeIncludeAllChildren) { // If possible, use a text iterator to get the text, so that whitespace // is handled consistently. if (Node* node = this->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 Nodes associated with them (like when // CSS content is used to insert text or when a RenderCounter is used.) if (m_renderer->isText()) { RenderText* renderTextObject = toRenderText(m_renderer); if (renderTextObject->isTextFragment()) return String(static_cast(m_renderer)->contentString()); return String(renderTextObject->text()); } } return AccessibilityNodeObject::textUnderElement(mode); } Node* AccessibilityRenderObject::node() const { return m_renderer ? m_renderer->node() : 0; } String AccessibilityRenderObject::stringValue() const { if (!m_renderer) return String(); if (isPasswordField()) return passwordFieldValue(); 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 overridden in the case where the selected item has an ARIA label. HTMLSelectElement* selectElement = toHTMLSelectElement(m_renderer->node()); int selectedIndex = selectElement->selectedIndex(); const Vector listItems = selectElement->listItems(); if (selectedIndex >= 0 && static_cast(selectedIndex) < listItems.size()) { const AtomicString& overriddenDescription = listItems[selectedIndex]->fastGetAttribute(aria_labelAttr); if (!overriddenDescription.isNull()) return overriddenDescription; } return toRenderMenuList(m_renderer)->text(); } if (m_renderer->isListMarker()) return toRenderListMarker(m_renderer)->text(); if (isWebArea()) { // FIXME: Why would a renderer exist when the Document isn't attached to a frame? if (m_renderer->frame()) return String(); ASSERT_NOT_REACHED(); } if (isTextControl()) return text(); if (m_renderer->isFileUploadControl()) 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(); } 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 (isHTMLLabelElement(parentNode)) return toHTMLLabelElement(parentNode); } return 0; } // The boundingBox for elements within the remote SVG element needs to be offset by its position // within the parent page, otherwise they are in relative coordinates only. void AccessibilityRenderObject::offsetBoundingBoxForRemoteSVGElement(LayoutRect& rect) const { for (AccessibilityObject* parent = parentObject(); parent; parent = parent->parentObject()) { if (parent->isAccessibilitySVGRoot()) { rect.moveBy(parent->parentObject()->boundingBoxRect().location()); break; } } } LayoutRect AccessibilityRenderObject::boundingBoxRect() const { RenderObject* obj = m_renderer; if (!obj) return LayoutRect(); 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. // We should also use absoluteQuads for SVG elements, otherwise transforms won't be applied. Vector quads; bool isSVGRoot = false; #if ENABLE(SVG) if (obj->isSVGRoot()) isSVGRoot = true; #endif if (obj->isText()) toRenderText(obj)->absoluteQuads(quads, 0, RenderText::ClipToEllipsis); else if (isWebArea() || isSeamlessWebArea() || isSVGRoot) obj->absoluteQuads(quads); else obj->absoluteFocusRingQuads(quads); LayoutRect result = boundingBoxForQuads(obj, quads); #if ENABLE(SVG) Document* document = this->document(); if (document && document->isSVGDocument()) offsetBoundingBoxForRemoteSVGElement(result); #endif // The size of the web area should be the content size, not the clipped size. if ((isWebArea() || isSeamlessWebArea()) && obj->frame()->view()) result.setSize(obj->frame()->view()->contentsSize()); return result; } LayoutRect AccessibilityRenderObject::checkboxOrRadioRect() const { if (!m_renderer) return LayoutRect(); HTMLLabelElement* label = labelForElement(toElement(m_renderer->node())); if (!label || !label->renderer()) return boundingBoxRect(); LayoutRect labelRect = axObjectCache()->getOrCreate(label)->elementRect(); labelRect.unite(boundingBoxRect()); return labelRect; } LayoutRect AccessibilityRenderObject::elementRect() const { // a checkbox or radio button should encompass its label if (isCheckboxOrRadio()) return checkboxOrRadioRect(); return boundingBoxRect(); } bool AccessibilityRenderObject::supportsPath() const { #if ENABLE(SVG) if (m_renderer && m_renderer->isSVGShape()) return true; #endif return false; } Path AccessibilityRenderObject::elementPath() const { #if ENABLE(SVG) if (m_renderer && m_renderer->isSVGShape() && toRenderSVGShape(m_renderer)->hasPath()) { Path path = toRenderSVGShape(m_renderer)->path(); // The SVG path is in terms of the parent's bounding box. The path needs to be offset to frame coordinates. for (RenderObject* parent = m_renderer->parent(); parent; parent = parent->parent()) { if (parent->isSVGRoot()) { LayoutPoint parentOffset = axObjectCache()->getOrCreate(parent)->elementRect().location(); path.transform(AffineTransform().translate(parentOffset.x(), parentOffset.y())); break; } } return path; } #endif return Path(); } IntPoint AccessibilityRenderObject::clickPoint() { // Headings are usually much wider than their textual content. If the mid point is used, often it can be wrong. if (isHeading() && children().size() == 1) return children()[0]->clickPoint(); // 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 (!isHTMLAnchorElement(element)) return 0; HTMLAnchorElement* anchor = toHTMLAnchorElement(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 || !isHTMLInputElement(node)) return; HTMLInputElement* input = toHTMLInputElement(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)) linkedUIElements.append(object); } } else { RefPtr list = node->document()->getElementsByTagName("input"); unsigned len = list->length(); for (unsigned i = 0; i < len; ++i) { if (isHTMLInputElement(list->item(i))) { HTMLInputElement* associateElement = toHTMLInputElement(list->item(i)); if (associateElement->isRadioButton() && associateElement->name() == input->name()) { if (AccessibilityObject* object = axObjectCache()->getOrCreate(associateElement)) 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); 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::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; // If this control is ignored (because it's invisible), // then the label needs to be exposed so it can be visible to accessibility. if (accessibilityIsIgnored()) return true; // Checkboxes and radio buttons use the text of their title ui element as their own AXTitle. // This code controls whether the title ui element should appear in the AX tree (usually, no). // It should appear if the control already has a label (which will be used as the AXTitle instead). if (isCheckboxOrRadio()) return hasTextAlternative(); // When controls have their own descriptions, the title element should be ignored. 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(RenderFieldset::IncludeFloatingOrOutOfFlow)); Node* node = m_renderer->node(); if (!node || !node->isElementNode()) return 0; HTMLLabelElement* label = labelForElement(toElement(node)); if (label && label->renderer()) return axObjectCache()->getOrCreate(label); return 0; } 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::defaultObjectInclusion() const { // The following cases can apply to any element that's a subclass of AccessibilityRenderObject. if (!m_renderer) return IgnoreObject; if (m_renderer->style()->visibility() != VISIBLE) { // aria-hidden is meant to override visibility as the determinant in AX hierarchy inclusion. if (equalIgnoringCase(getAttribute(aria_hiddenAttr), "false")) return DefaultBehavior; return IgnoreObject; } return AccessibilityObject::defaultObjectInclusion(); } bool AccessibilityRenderObject::computeAccessibilityIsIgnored() const { #ifndef NDEBUG ASSERT(m_initialized); #endif // 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 = defaultObjectInclusion(); 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 AccessibilityObject* parent = parentObjectUnignored(); if (parent && (parent->ariaRoleAttribute() == MenuItemRole || parent->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 && isHTMLLabelElement(node)) 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 (hasContentEditableAttributeSet()) 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 ENABLE(MATHML) // First check if this is a special case within the math tree that needs to be ignored. if (isIgnoredElementWithinMathTree()) return true; // Otherwise all other math elements are in the tree. if (isMathElement()) return false; #endif // tags are inline tags and not meant to convey information if they have no other aria // information on them. If we don't ignore them, they may emit signals expected to come from // their parent. In addition, because included spans are GroupRole objects, and GroupRole // objects are often containers with meaningful information, the inclusion of a span can have // the side effect of causing the immediate parent accessible to be ignored. This is especially // problematic for platforms which have distinct roles for textual block elements. if (node && node->hasTagName(spanTag)) return true; if (m_renderer->isBlockFlow() && m_renderer->childrenInline() && !canSetFocusAttribute()) return !toRenderBlock(m_renderer)->firstLineBox() && !mouseButtonListener(); // ignore images seemingly used as spacers if (isImage()) { // If the image can take focus, it should not be ignored, lest the user not be able to interact with something important. if (canSetFocusAttribute()) return false; if (node && node->isElementNode()) { Element* elt = toElement(node); const AtomicString& alt = elt->getAttribute(altAttr); // don't ignore an image that has an alt tag if (!alt.string().containsOnlyWhitespace()) return false; // informal standard is to ignore images with zero-length alt strings if (!alt.isNull()) return true; // If an image has a title attribute on it, accessibility should be lenient and allow it to appear in the hierarchy (according to WAI-ARIA). if (!getAttribute(titleAttr).isEmpty()) 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()) { LayoutSize imageSize = image->cachedImage()->imageSizeForRenderer(m_renderer, image->view()->zoomFactor()); return imageSize.height() <= 1 || imageSize.width() <= 1; } } return false; } if (isCanvas()) { if (canvasHasFallbackContent()) return false; if (m_renderer->isBox()) { RenderBox* canvasBox = toRenderBox(m_renderer); if (canvasBox->height() <= 1 || canvasBox->width() <= 1) return true; } // Otherwise fall through; use presence of help text, title, or description to decide. } if (isWebArea() || isSeamlessWebArea() || m_renderer->isListMarker()) return false; // Using the help text, title or accessibility description (so we // check if there's some kind of accessible name for the element) // to decide an element's visibility is not as definitive as // previous checks, so this should remain as one of the last. // // These checks are simplified in the interest of execution speed; // for example, any element having an alt attribute will make it // not ignored, rather than just images. if (!getAttribute(aria_helpAttr).isEmpty() || !getAttribute(aria_describedbyAttr).isEmpty() || !getAttribute(altAttr).isEmpty() || !getAttribute(titleAttr).isEmpty()) return false; // Don't ignore generic focusable elements like
// unless they're completely empty, with no children. if (isGenericFocusableElement() && node->firstChild()) return false; if (!ariaAccessibilityDescription().isEmpty()) return false; #if ENABLE(MATHML) if (!getAttribute(MathMLNames::alttextAttr).isEmpty()) return false; #endif // Other non-ignored host language elements if (node && node->hasTagName(dfnTag)) 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 (isPasswordField()) return passwordFieldValue(); return AccessibilityNodeObject::text(); } int AccessibilityRenderObject::textLength() const { ASSERT(isTextControl()); if (isPasswordField()) #if PLATFORM(GTK) return passwordFieldValue().length(); #else return -1; // need to return something distinct from 0 #endif return text().length(); } PlainTextRange AccessibilityRenderObject::ariaSelectedTextRange() const { Node* node = m_renderer->node(); if (!node) return PlainTextRange(); VisibleSelection visibleSelection = selection(); RefPtr currentSelectionRange = visibleSelection.toNormalizedRange(); if (!currentSelectionRange || !currentSelectionRange->intersectsNode(node, IGNORE_EXCEPTION)) 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()) { HTMLTextFormControlElement* textControl = toRenderTextControl(m_renderer)->textFormControlElement(); return textControl->selectedText(); } 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 toElement(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) { HTMLTextFormControlElement* textControl = toRenderTextControl(m_renderer)->textFormControlElement(); return PlainTextRange(textControl->selectionStart(), textControl->selectionEnd() - textControl->selectionStart()); } if (ariaRole == UnknownRole) return PlainTextRange(); return ariaSelectedTextRange(); } void AccessibilityRenderObject::setSelectedTextRange(const PlainTextRange& range) { if (isNativeTextControl()) { HTMLTextFormControlElement* textControl = toRenderTextControl(m_renderer)->textFormControlElement(); textControl->setSelectionRange(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() && isHTMLAnchorElement(m_renderer->node())) { if (HTMLAnchorElement* anchor = toHTMLAnchorElement(anchorElement())) return anchor->href(); } if (isWebArea()) return m_renderer->document()->url(); if (isImage() && m_renderer->node() && isHTMLImageElement(m_renderer->node())) return toHTMLImageElement(m_renderer->node())->src(); if (isInputImage()) return toHTMLInputElement(m_renderer->node())->src(); return KURL(); } bool AccessibilityRenderObject::isUnvisited() const { // FIXME: Is it a privacy violation to expose unvisited information to accessibility APIs? return m_renderer->style()->isLink() && m_renderer->style()->insideLink() == InsideUnvisitedLink; } 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 = toElement(node); element->setAttribute(attributeName, (value) ? "true" : "false"); } bool AccessibilityRenderObject::elementAttributeValue(const QualifiedName& attributeName) const { if (!m_renderer) return false; return equalIgnoringCase(getAttribute(attributeName), "true"); } 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); // 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; Element* focusedElement = document->focusedElement(); if (!focusedElement) 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 (focusedElement == m_renderer->node() || (roleValue() == WebAreaRole && document->frame()->selection()->isFocusedAndActive())) return true; return false; } void AccessibilityRenderObject::setFocused(bool on) { if (!canSetFocusAttribute()) return; Document* document = this->document(); Node* node = this->node(); if (!on || !node || !node->isElementNode()) { document->setFocusedElement(0); return; } // If this node is already the currently focused node, then calling focus() won't do anything. // That is a problem when focus is removed from the webpage to chrome, and then returns. // In these cases, we need to do what keyboard and mouse focus do, which is reset focus first. if (document->focusedElement() == node) document->setFocusedElement(0); toElement(node)->focus(); } 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 = toElement(m_renderer->node()); 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. toHTMLInputElement(element)->setValue(string); } else if (renderer->isTextArea()) { // FIXME: This is not safe! Other elements could have a TextArea renderer. toHTMLTextAreaElement(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(); } RenderView* AccessibilityRenderObject::topRenderer() const { Document* topDoc = topDocument(); if (!topDoc) return 0; return topDoc->renderView(); } Document* AccessibilityRenderObject::document() const { if (!m_renderer) return 0; return m_renderer->document(); } Document* AccessibilityRenderObject::topDocument() const { if (!document()) return 0; return document()->topDocument(); } FrameView* AccessibilityRenderObject::topDocumentFrameView() const { RenderView* renderView = topRenderer(); if (!renderView || !renderView->view()) return 0; return renderView->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); } void AccessibilityRenderObject::getDocumentLinks(AccessibilityChildrenVector& result) { Document* document = m_renderer->document(); RefPtr links = document->links(); for (unsigned i = 0; Node* curr = links->item(i); i++) { 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 && isHTMLAreaElement(curr) && isHTMLMapElement(parent)) { AccessibilityImageMapLink* areaObject = static_cast(axObjectCache()->getOrCreate(ImageMapLinkRole)); HTMLMapElement* map = toHTMLMapElement(parent); areaObject->setHTMLAreaElement(toHTMLAreaElement(curr)); areaObject->setHTMLMapElement(map); areaObject->setParent(accessibilityParentForImageMap(map)); result.append(areaObject); } } } } 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()->positionForPoint(IntPoint()); 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. FrameSelection selection; selection.setSelection(VisibleSelection(visiblePos)); selection.modify(FrameSelection::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); RefPtr range = Range::create(m_renderer->document()); range->selectNodeContents(node, IGNORE_EXCEPTION); CharacterIterator it(range.get()); it.advance(index - 1); return VisiblePosition(Position(it.range()->endContainer(), it.range()->endOffset(), Position::PositionIsOffsetInAnchor), UPSTREAM); } int AccessibilityRenderObject::indexForVisiblePosition(const VisiblePosition& pos) const { if (isNativeTextControl()) { HTMLTextFormControlElement* textControl = toRenderTextControl(m_renderer)->textFormControlElement(); return textControl->indexForVisiblePosition(pos); } if (!isTextControl()) return 0; Node* node = m_renderer->node(); if (!node) return 0; Position indexPosition = pos.deepEquivalent(); if (indexPosition.isNull() || highestEditableRoot(indexPosition, HasEditableAXRole) != node) return 0; RefPtr range = Range::create(m_renderer->document()); range->setStart(node, 0, IGNORE_EXCEPTION); range->setEnd(indexPosition, IGNORE_EXCEPTION); #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 } Element* AccessibilityRenderObject::rootEditableElementForPosition(const Position& position) const { // Find the root editable or pseudo-editable (i.e. having an editable ARIA role) element. Element* result = 0; Element* rootEditableElement = position.rootEditableElement(); for (Element* e = position.element(); e && e != rootEditableElement; e = e->parentElement()) { if (nodeIsTextControl(e)) result = e; if (e->hasTagName(bodyTag)) break; } if (result) return result; return rootEditableElement; } bool AccessibilityRenderObject::nodeIsTextControl(const Node* node) const { if (!node) return false; const AccessibilityObject* axObjectForNode = axObjectCache()->getOrCreate(const_cast(node)); if (!axObjectForNode) return false; return axObjectForNode->isTextControl(); } IntRect AccessibilityRenderObject::boundsForVisiblePositionRange(const VisiblePositionRange& visiblePositionRange) const { if (visiblePositionRange.isNull()) return IntRect(); // Create a mutable VisiblePositionRange. VisiblePositionRange range(visiblePositionRange); LayoutRect rect1 = range.start.absoluteCaretBounds(); LayoutRect 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(); } } LayoutRect 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); LayoutRect 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(pixelSnappedIntRect(ourrect)); #else return pixelSnappedIntRect(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, UserTriggered); 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 RenderView* renderView = topRenderer(); if (!renderView) return VisiblePosition(); FrameView* frameView = renderView->frameView(); if (!frameView) return VisiblePosition(); Node* innerNode = 0; // locate the node containing the point LayoutPoint pointResult; while (1) { LayoutPoint ourpoint; #if PLATFORM(MAC) ourpoint = frameView->screenToContents(point); #else ourpoint = point; #endif HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active); HitTestResult result(ourpoint); renderView->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 = toFrameView(widget)->frame(); if (!frame) break; renderView = frame->document()->renderView(); frameView = toFrameView(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 (position.isNull() || !isTextControl()) return -1; if (renderObjectContainsPosition(m_renderer, position.deepEquivalent())) return indexForVisiblePosition(position); return -1; } void AccessibilityRenderObject::lineBreaks(Vector& lineBreaks) const { if (!isTextControl()) return; VisiblePosition visiblePos = visiblePositionForIndex(0); VisiblePosition savedVisiblePos = visiblePos; visiblePos = nextLinePosition(visiblePos, 0); while (!visiblePos.isNull() && visiblePos != savedVisiblePos) { lineBreaks.append(indexForVisiblePosition(visiblePos)); savedVisiblePos = visiblePos; visiblePos = nextLinePosition(visiblePos, 0); } } // 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 (!range.length) return String(); if (!isTextControl()) return String(); String elementText = isPasswordField() ? passwordFieldValue() : 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; AccessibilityObject* parent = 0; for (Element* mapParent = area->parentElement(); mapParent; mapParent = mapParent->parentElement()) { if (isHTMLMapElement(mapParent)) { parent = accessibilityParentForImageMap(toHTMLMapElement(mapParent)); break; } } 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::remoteSVGElementHitTest(const IntPoint& point) const { AccessibilityObject* remote = remoteSVGRootElement(); if (!remote) return 0; IntSize offset = point - roundedIntPoint(boundingBoxRect().location()); return remote->accessibilityHitTest(IntPoint(offset)); } AccessibilityObject* AccessibilityRenderObject::elementAccessibilityHitTest(const IntPoint& point) const { if (isSVGImage()) return remoteSVGElementHitTest(point); return AccessibilityObject::elementAccessibilityHitTest(point); } 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 | HitTestRequest::AccessibilityHitTest); HitTestResult hitTestResult = HitTestResult(point); layer->hitTest(request, hitTestResult); if (!hitTestResult.innerNode()) return 0; Node* node = hitTestResult.innerNode()->deprecatedShadowAncestorNode(); if (isHTMLAreaElement(node)) return accessibilityImageMapHitTest(toHTMLAreaElement(node), point); if (isHTMLOptionElement(node)) node = toHTMLOptionElement(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 && 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::shouldNotifyActiveDescendant() const { // We want to notify that the combo box has changed its active descendant, // but we do not want to change the focus, because focus should remain with the combo box. if (isComboBox()) return true; return shouldFocusActiveDescendant(); } bool AccessibilityRenderObject::shouldFocusActiveDescendant() const { switch (ariaRoleAttribute()) { case GroupRole: 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 = toElement(m_renderer->node()); const AtomicString& activeDescendantAttrStr = element->getAttribute(aria_activedescendantAttr); if (activeDescendantAttrStr.isNull() || activeDescendantAttrStr.isEmpty()) return 0; Element* target = element->treeScope()->getElementById(activeDescendantAttrStr); if (!target) return 0; AccessibilityObject* obj = axObjectCache()->getOrCreate(target); 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 = toElement(renderer()->node()); if (!element) return; Document* doc = renderer()->document(); if (!doc->frame()->selection()->isFocusedAndActive() || doc->focusedElement() != element) return; AccessibilityRenderObject* activedescendant = static_cast(activeDescendant()); if (activedescendant && shouldNotifyActiveDescendant()) 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; // Make sure the corresponding control isn't a descendant of this label that's in the middle of being destroyed. if (correspondingControl->renderer() && !correspondingControl->renderer()->parent()) return 0; return axObjectCache()->getOrCreate(correspondingControl); } AccessibilityObject* AccessibilityRenderObject::correspondingLabelForControlElement() const { if (!m_renderer) return 0; // ARIA: section 2A, bullet #3 says if aria-labeledby or aria-label appears, it should // override the "label" element association. if (hasTextAlternative()) return 0; Node* node = m_renderer->node(); if (node && node->isHTMLElement()) { HTMLLabelElement* label = labelForElement(toElement(node)); if (label) return axObjectCache()->getOrCreate(label); } 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; } bool AccessibilityRenderObject::isDescendantOfElementType(const QualifiedName& tagName) const { for (RenderObject* parent = m_renderer->parent(); parent; parent = parent->parent()) { if (parent->node() && parent->node()->hasTagName(tagName)) return true; } return false; } 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()) || (node && node->hasTagName(liTag))) return ListItemRole; if (m_renderer->isListMarker()) return ListMarkerRole; if (node && node->hasTagName(buttonTag)) return buttonRoleType(); if (node && node->hasTagName(legendTag)) return LegendRole; if (m_renderer->isText()) return StaticTextRole; if (cssBox && cssBox->isImage()) { if (node && isHTMLInputElement(node)) return ariaHasPopup() ? PopUpButtonRole : ButtonRole; if (isSVGImage()) return SVGRootRole; return ImageRole; } if (node && node->hasTagName(canvasTag)) return CanvasRole; if (cssBox && cssBox->isRenderView()) { // If the iframe is seamless, it should not be announced as a web area to AT clients. if (document() && document()->shouldDisplaySeamlesslyWithParent()) return SeamlessWebAreaRole; return WebAreaRole; } if (cssBox && cssBox->isTextField()) return TextFieldRole; if (cssBox && cssBox->isTextArea()) return TextAreaRole; if (node && isHTMLInputElement(node)) { HTMLInputElement* input = toHTMLInputElement(node); if (input->isCheckbox()) return CheckBoxRole; if (input->isRadioButton()) return RadioButtonRole; if (input->isTextButton()) return buttonRoleType(); #if ENABLE(INPUT_TYPE_COLOR) const AtomicString& type = input->getAttribute(typeAttr); if (equalIgnoringCase(type, "color")) return ColorWellRole; #endif } if (isFileUploadButton()) return ButtonRole; if (cssBox && cssBox->isMenuList()) return PopUpButtonRole; if (headingLevel()) return HeadingRole; #if ENABLE(SVG) if (m_renderer->isSVGImage()) return ImageRole; if (m_renderer->isSVGRoot()) return SVGRootRole; if (node && node->hasTagName(SVGNames::gTag)) return GroupRole; #endif #if ENABLE(MATHML) if (node && node->hasTagName(MathMLNames::mathTag)) return DocumentMathRole; #endif // It's not clear which role a platform should choose for a math element. // Declaring a math element role should give flexibility to platforms to choose. if (isMathElement()) return MathElementRole; if (node && node->hasTagName(ddTag)) return DescriptionListDetailRole; if (node && node->hasTagName(dtTag)) return DescriptionListTermRole; if (node && node->hasTagName(dlTag)) return DescriptionListRole; 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 && isHTMLTableElement(node)) return TableRole; #endif // Table sections should be ignored. if (m_renderer->isTableSection()) return IgnoredRole; if (m_renderer->isHR()) return HorizontalRuleRole; if (node && node->hasTagName(pTag)) return ParagraphRole; if (node && isHTMLLabelElement(node)) return LabelRole; if (node && node->hasTagName(dfnTag)) return DefinitionRole; if (node && node->hasTagName(divTag)) return DivRole; if (node && isHTMLFormElement(node)) return FormRole; if (node && node->hasTagName(articleTag)) return DocumentArticleRole; if (node && node->hasTagName(mainTag)) return LandmarkMainRole; if (node && node->hasTagName(navTag)) return LandmarkNavigationRole; if (node && node->hasTagName(asideTag)) return LandmarkComplementaryRole; if (node && node->hasTagName(sectionTag)) return DocumentRegionRole; if (node && node->hasTagName(addressTag)) return LandmarkContentInfoRole; // The HTML element should not be exposed as an element. That's what the RenderView element does. if (node && node->hasTagName(htmlTag)) return IgnoredRole; // There should only be one banner/contentInfo per page. If header/footer are being used within an article or section // then it should not be exposed as whole page's banner/contentInfo if (node && node->hasTagName(headerTag) && !isDescendantOfElementType(articleTag) && !isDescendantOfElementType(sectionTag)) return LandmarkBannerRole; if (node && node->hasTagName(footerTag) && !isDescendantOfElementType(articleTag) && !isDescendantOfElementType(sectionTag)) return FooterRole; 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 states if an item can get focus, it should not be presentational. if (canSetFocusAttribute()) return false; // 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(toElement(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 SpinButtonRole: // case SeparatorRole: return true; default: return false; } } 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 { // In the event of a (Boolean)@readonly and (True/False/Undefined)@aria-readonly // value mismatch, the host language native attribute value wins. if (isNativeTextControl()) return !isReadOnly(); if (equalIgnoringCase(getAttribute(aria_readonlyAttr), "true")) return false; if (equalIgnoringCase(getAttribute(aria_readonlyAttr), "false")) return true; if (isProgressIndicator() || isSlider()) return true; if (isTextControl() && !isNativeTextControl()) return true; // Any node could be contenteditable, so isReadOnly should be relied upon // for this information for all elements. return !isReadOnly(); } bool AccessibilityRenderObject::canSetTextRangeAttributes() const { return isTextControl(); } void AccessibilityRenderObject::textChanged() { // If this element supports ARIA live regions, or is part of a region with an ARIA editable role, // 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 (parent->supportsARIALiveRegion()) cache->postNotification(renderParent, AXObjectCache::AXLiveRegionChanged, true); if (parent->isARIATextControl() && !parent->isNativeTextControl() && !parent->node()->rendererIsEditable()) cache->postNotification(renderParent, AXObjectCache::AXValueChanged, true); } } void AccessibilityRenderObject::clearChildren() { AccessibilityObject::clearChildren(); m_childrenDirty = false; } void AccessibilityRenderObject::addImageMapChildren() { RenderBoxModelObject* cssBox = renderBoxModelObject(); if (!cssBox || !cssBox->isRenderImage()) return; HTMLMapElement* map = toRenderImage(cssBox)->imageMap(); if (!map) return; for (Element* current = ElementTraversal::firstWithin(map); current; current = ElementTraversal::next(current, map)) { // add an element for this child if it has a link if (isHTMLAreaElement(current) && current->isLink()) { AccessibilityImageMapLink* areaObject = static_cast(axObjectCache()->getOrCreate(ImageMapLinkRole)); areaObject->setHTMLAreaElement(toHTMLAreaElement(current)); areaObject->setHTMLMapElement(map); areaObject->setParent(this); if (!areaObject->accessibilityIsIgnored()) m_children.append(areaObject); else axObjectCache()->remove(areaObject->axObjectID()); } } } void AccessibilityRenderObject::updateChildrenIfNecessary() { if (needsToUpdateChildren()) clearChildren(); AccessibilityObject::updateChildrenIfNecessary(); } void AccessibilityRenderObject::addTextFieldChildren() { Node* node = this->node(); if (!node || !isHTMLInputElement(node)) return; HTMLInputElement* input = toHTMLInputElement(node); HTMLElement* spinButtonElement = input->innerSpinButtonElement(); if (!spinButtonElement || !spinButtonElement->isSpinButtonElement()) return; AccessibilitySpinButton* axSpinButton = static_cast(axObjectCache()->getOrCreate(SpinButtonRole)); axSpinButton->setSpinButtonElement(static_cast(spinButtonElement)); axSpinButton->setParent(this); m_children.append(axSpinButton); } bool AccessibilityRenderObject::isSVGImage() const { return remoteSVGRootElement(); } void AccessibilityRenderObject::detachRemoteSVGRoot() { if (AccessibilitySVGRoot* root = remoteSVGRootElement()) root->setParent(0); } AccessibilitySVGRoot* AccessibilityRenderObject::remoteSVGRootElement() const { #if ENABLE(SVG) if (!m_renderer || !m_renderer->isRenderImage()) return 0; CachedImage* cachedImage = toRenderImage(m_renderer)->cachedImage(); if (!cachedImage) return 0; Image* image = cachedImage->image(); if (!image || !image->isSVGImage()) return 0; SVGImage* svgImage = static_cast(image); FrameView* frameView = svgImage->frameView(); if (!frameView) return 0; Frame* frame = frameView->frame(); if (!frame) return 0; Document* doc = frame->document(); if (!doc || !doc->isSVGDocument()) return 0; SVGSVGElement* rootElement = toSVGDocument(doc)->rootElement(); if (!rootElement) return 0; RenderObject* rendererRoot = rootElement->renderer(); if (!rendererRoot) return 0; AccessibilityObject* rootSVGObject = frame->document()->axObjectCache()->getOrCreate(rendererRoot); // In order to connect the AX hierarchy from the SVG root element from the loaded resource // the parent must be set, because there's no other way to get back to who created the image. ASSERT(rootSVGObject && rootSVGObject->isAccessibilitySVGRoot()); if (!rootSVGObject->isAccessibilitySVGRoot()) return 0; return toAccessibilitySVGRoot(rootSVGObject); #else return 0; #endif } void AccessibilityRenderObject::addRemoteSVGChildren() { AccessibilitySVGRoot* root = remoteSVGRootElement(); if (!root) return; root->setParent(this); if (root->accessibilityIsIgnored()) { AccessibilityChildrenVector children = root->children(); unsigned length = children.size(); for (unsigned i = 0; i < length; ++i) m_children.append(children[i]); } else m_children.append(root); } void AccessibilityRenderObject::addCanvasChildren() { if (!node() || !node()->hasTagName(canvasTag)) return; // If it's a canvas, it won't have rendered children, but it might have accessible fallback content. // Clear m_haveChildren because AccessibilityNodeObject::addChildren will expect it to be false. ASSERT(!m_children.size()); m_haveChildren = false; AccessibilityNodeObject::addChildren(); } void AccessibilityRenderObject::addAttachmentChildren() { if (!isAttachment()) return; // FrameView's need to be inserted into the AX hierarchy when encountered. Widget* widget = widgetForAttachmentView(); if (!widget || !widget->isFrameView()) return; AccessibilityObject* axWidget = axObjectCache()->getOrCreate(widget); if (!axWidget->accessibilityIsIgnored()) m_children.append(axWidget); } #if PLATFORM(MAC) void AccessibilityRenderObject::updateAttachmentViewParents() { // Only the unignored parent should set the attachment parent, because that's what is reflected in the AX // hierarchy to the client. if (accessibilityIsIgnored()) return; size_t length = m_children.size(); for (size_t k = 0; k < length; k++) { if (m_children[k]->isAttachment()) m_children[k]->overrideAttachmentParent(this); } } #endif // Hidden children are those that are not rendered or visible, but are specifically marked as aria-hidden=false, // meaning that they should be exposed to the AX hierarchy. void AccessibilityRenderObject::addHiddenChildren() { Node* node = this->node(); if (!node) return; // First do a quick run through to determine if we have any hidden nodes (most often we will not). // If we do have hidden nodes, we need to determine where to insert them so they match DOM order as close as possible. bool shouldInsertHiddenNodes = false; for (Node* child = node->firstChild(); child; child = child->nextSibling()) { if (!child->renderer() && isNodeAriaVisible(child)) { shouldInsertHiddenNodes = true; break; } } if (!shouldInsertHiddenNodes) return; // Iterate through all of the children, including those that may have already been added, and // try to insert hidden nodes in the correct place in the DOM order. unsigned insertionIndex = 0; for (Node* child = node->firstChild(); child; child = child->nextSibling()) { if (child->renderer()) { // Find out where the last render sibling is located within m_children. AccessibilityObject* childObject = axObjectCache()->get(child->renderer()); if (childObject && childObject->accessibilityIsIgnored()) { AccessibilityChildrenVector children = childObject->children(); if (children.size()) childObject = children.last().get(); else childObject = 0; } if (childObject) insertionIndex = m_children.find(childObject) + 1; continue; } if (!isNodeAriaVisible(child)) continue; unsigned previousSize = m_children.size(); if (insertionIndex > previousSize) insertionIndex = previousSize; insertChild(axObjectCache()->getOrCreate(child), insertionIndex); insertionIndex += (m_children.size() - previousSize); } } 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); m_haveChildren = true; if (!canHaveChildren()) return; for (RefPtr obj = firstChild(); obj; obj = obj->nextSibling()) addChild(obj.get()); addHiddenChildren(); addAttachmentChildren(); addImageMapChildren(); addTextFieldChildren(); addCanvasChildren(); addRemoteSVGChildren(); #if PLATFORM(MAC) updateAttachmentViewParents(); #endif } bool AccessibilityRenderObject::canHaveChildren() const { if (!m_renderer) return false; return AccessibilityNodeObject::canHaveChildren(); } const AtomicString& AccessibilityRenderObject::ariaLiveRegionStatus() const { DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusAssertive, ("assertive", AtomicString::ConstructFromLiteral)); DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusPolite, ("polite", AtomicString::ConstructFromLiteral)); DEFINE_STATIC_LOCAL(const AtomicString, liveRegionStatusOff, ("off", AtomicString::ConstructFromLiteral)); 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", AtomicString::ConstructFromLiteral)); 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; if (isTree()) ariaTreeRows(allRows); else if (isAccessibilityTable() && toAccessibilityTable(this)->supportsSelectedRows()) allRows = toAccessibilityTable(this)->rows(); // 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(); AccessibilityObject::AccessibilityChildrenVector children = this->children(); size_t size = children.size(); for (size_t i = 0; i < size; i++) { if (!children[i]->isOffScreen()) result.append(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); AccessibilityObject::AccessibilityChildrenVector children = this->children(); size_t size = children.size(); for (size_t i = 0; i < size; ++i) { if (children[i]->isTabItem()) result.append(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: case ToggleButtonRole: 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(const AtomicString& 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()) toElement(domNode)->setAttribute(aria_labelAttr, name); } 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 && isHTMLAnchorElement(anchor)) return toHTMLAnchorElement(anchor)->href(); } return stringValue(); } bool AccessibilityRenderObject::isLinked() const { if (!isLinkable(*this)) return false; Element* anchor = anchorElement(); if (!anchor || !isHTMLAnchorElement(anchor)) return false; return !toHTMLAnchorElement(anchor)->href().isEmpty(); } bool AccessibilityRenderObject::hasBoldFont() const { if (!m_renderer) return false; return m_renderer->style()->fontDescription().weight() >= FontWeightBold; } bool AccessibilityRenderObject::hasItalicFont() const { if (!m_renderer) return false; return m_renderer->style()->fontDescription().italic() == FontItalicOn; } bool AccessibilityRenderObject::hasPlainText() const { if (!m_renderer) return false; RenderStyle* style = m_renderer->style(); return style->fontDescription().weight() == FontWeightNormal && style->fontDescription().italic() == FontItalicOff && style->textDecorationsInEffect() == TextDecorationNone; } bool AccessibilityRenderObject::hasSameFont(RenderObject* renderer) const { if (!m_renderer || !renderer) return false; return m_renderer->style()->fontDescription().families() == renderer->style()->fontDescription().families(); } bool AccessibilityRenderObject::hasSameFontColor(RenderObject* renderer) const { if (!m_renderer || !renderer) return false; return m_renderer->style()->visitedDependentColor(CSSPropertyColor) == renderer->style()->visitedDependentColor(CSSPropertyColor); } bool AccessibilityRenderObject::hasSameStyle(RenderObject* renderer) const { if (!m_renderer || !renderer) return false; return m_renderer->style() == renderer->style(); } bool AccessibilityRenderObject::hasUnderline() const { if (!m_renderer) return false; return m_renderer->style()->textDecorationsInEffect() & TextDecorationUnderline; } 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 = toElement(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; } String AccessibilityRenderObject::passwordFieldValue() const { #if PLATFORM(GTK) ASSERT(isPasswordField()); // Look for the RenderText object in the RenderObject tree for this input field. RenderObject* renderer = node()->renderer(); while (renderer && !renderer->isText()) renderer = renderer->firstChild(); if (!renderer || !renderer->isText()) return String(); // Return the text that is actually being rendered in the input field. return static_cast(renderer)->textWithoutTranscoding(); #else // It seems only GTK is interested in this at the moment. return String(); #endif } ScrollableArea* AccessibilityRenderObject::getScrollableAreaIfScrollable() const { // If the parent is a scroll view, then this object isn't really scrollable, the parent ScrollView should handle the scrolling. if (parentObject() && parentObject()->isAccessibilityScrollView()) return 0; if (!m_renderer || !m_renderer->isBox()) return 0; RenderBox* box = toRenderBox(m_renderer); if (!box->canBeScrolledAndHasScrollableArea()) return 0; return box->layer(); } void AccessibilityRenderObject::scrollTo(const IntPoint& point) const { if (!m_renderer || !m_renderer->isBox()) return; RenderBox* box = toRenderBox(m_renderer); if (!box->canBeScrolledAndHasScrollableArea()) return; RenderLayer* layer = box->layer(); layer->scrollToOffset(toIntSize(point), RenderLayer::ScrollOffsetClamped); } #if ENABLE(MATHML) bool AccessibilityRenderObject::isMathElement() const { Node* node = this->node(); if (!m_renderer || !node) return false; return node->isElementNode() && toElement(node)->isMathMLElement(); } bool AccessibilityRenderObject::isMathFraction() const { if (!m_renderer || !m_renderer->isRenderMathMLBlock()) return false; return toRenderMathMLBlock(m_renderer)->isRenderMathMLFraction(); } bool AccessibilityRenderObject::isMathFenced() const { if (!m_renderer || !m_renderer->isRenderMathMLBlock()) return false; return toRenderMathMLBlock(m_renderer)->isRenderMathMLFenced(); } bool AccessibilityRenderObject::isMathSubscriptSuperscript() const { if (!m_renderer || !m_renderer->isRenderMathMLBlock()) return false; return toRenderMathMLBlock(m_renderer)->isRenderMathMLSubSup(); } bool AccessibilityRenderObject::isMathRow() const { if (!m_renderer || !m_renderer->isRenderMathMLBlock()) return false; return toRenderMathMLBlock(m_renderer)->isRenderMathMLRow(); } bool AccessibilityRenderObject::isMathUnderOver() const { if (!m_renderer || !m_renderer->isRenderMathMLBlock()) return false; return toRenderMathMLBlock(m_renderer)->isRenderMathMLUnderOver(); } bool AccessibilityRenderObject::isMathSquareRoot() const { if (!m_renderer || !m_renderer->isRenderMathMLBlock()) return false; return toRenderMathMLBlock(m_renderer)->isRenderMathMLSquareRoot(); } bool AccessibilityRenderObject::isMathRoot() const { if (!m_renderer || !m_renderer->isRenderMathMLBlock()) return false; return toRenderMathMLBlock(m_renderer)->isRenderMathMLRoot(); } bool AccessibilityRenderObject::isMathOperator() const { if (!m_renderer || !m_renderer->isRenderMathMLBlock()) return false; // Ensure that this is actually a render MathML operator because // MathML will create MathMLBlocks and use the original node as the node // of this new block that is not tied to the DOM. if (!toRenderMathMLBlock(m_renderer)->isRenderMathMLOperator()) return false; return isMathElement() && node()->hasTagName(MathMLNames::moTag); } bool AccessibilityRenderObject::isMathFenceOperator() const { if (!m_renderer || !m_renderer->isRenderMathMLBlock()) return false; if (!toRenderMathMLBlock(m_renderer)->isRenderMathMLOperator()) return false; RenderMathMLOperator* mathOperator = toRenderMathMLOperator(toRenderMathMLBlock(m_renderer)); return mathOperator->operatorType() == RenderMathMLOperator::Fence; } bool AccessibilityRenderObject::isMathSeparatorOperator() const { if (!m_renderer || !m_renderer->isRenderMathMLBlock()) return false; if (!toRenderMathMLBlock(m_renderer)->isRenderMathMLOperator()) return false; RenderMathMLOperator* mathOperator = toRenderMathMLOperator(toRenderMathMLBlock(m_renderer)); return mathOperator->operatorType() == RenderMathMLOperator::Separator; } bool AccessibilityRenderObject::isMathText() const { return node() && node()->hasTagName(MathMLNames::mtextTag); } bool AccessibilityRenderObject::isMathNumber() const { return node() && node()->hasTagName(MathMLNames::mnTag); } bool AccessibilityRenderObject::isMathIdentifier() const { return node() && node()->hasTagName(MathMLNames::miTag); } bool AccessibilityRenderObject::isMathMultiscript() const { return node() && node()->hasTagName(MathMLNames::mmultiscriptsTag); } bool AccessibilityRenderObject::isMathTable() const { return node() && node()->hasTagName(MathMLNames::mtableTag); } bool AccessibilityRenderObject::isMathTableRow() const { return node() && node()->hasTagName(MathMLNames::mtrTag); } bool AccessibilityRenderObject::isMathTableCell() const { return node() && node()->hasTagName(MathMLNames::mtdTag); } bool AccessibilityRenderObject::isIgnoredElementWithinMathTree() const { if (!m_renderer) return true; // Ignore items that were created for layout purposes only. if (m_renderer->isRenderMathMLBlock() && toRenderMathMLBlock(m_renderer)->ignoreInAccessibilityTree()) return true; // Ignore anonymous renderers inside math blocks. if (m_renderer->isAnonymous()) { for (AccessibilityObject* parent = parentObject(); parent; parent = parent->parentObject()) { if (parent->isMathElement()) return true; } } // Only math elements that we explicitly recognize should be included // We don't want things like to appear in the tree. if (isMathElement()) { if (isMathFraction() || isMathFenced() || isMathSubscriptSuperscript() || isMathRow() || isMathUnderOver() || isMathRoot() || isMathText() || isMathNumber() || isMathOperator() || isMathFenceOperator() || isMathSeparatorOperator() || isMathIdentifier() || isMathTable() || isMathTableRow() || isMathTableCell() || isMathMultiscript()) return false; return true; } return false; } AccessibilityObject* AccessibilityRenderObject::mathRadicandObject() { if (!isMathRoot()) return 0; AccessibilityObject::AccessibilityChildrenVector children = this->children(); if (children.size() < 1) return 0; // The radicand is the value being rooted and must be listed first. return children[0].get(); } AccessibilityObject* AccessibilityRenderObject::mathRootIndexObject() { if (!isMathRoot()) return 0; AccessibilityObject::AccessibilityChildrenVector children = this->children(); if (children.size() != 2) return 0; // The index in a root is the value which determines if it's a square, cube, etc, root // and must be listed second. return children[1].get(); } AccessibilityObject* AccessibilityRenderObject::mathNumeratorObject() { if (!isMathFraction()) return 0; AccessibilityObject::AccessibilityChildrenVector children = this->children(); if (children.size() != 2) return 0; return children[0].get(); } AccessibilityObject* AccessibilityRenderObject::mathDenominatorObject() { if (!isMathFraction()) return 0; AccessibilityObject::AccessibilityChildrenVector children = this->children(); if (children.size() != 2) return 0; return children[1].get(); } AccessibilityObject* AccessibilityRenderObject::mathUnderObject() { if (!isMathUnderOver() || !node()) return 0; AccessibilityChildrenVector children = this->children(); if (children.size() < 2) return 0; if (node()->hasTagName(MathMLNames::munderTag) || node()->hasTagName(MathMLNames::munderoverTag)) return children[1].get(); return 0; } AccessibilityObject* AccessibilityRenderObject::mathOverObject() { if (!isMathUnderOver() || !node()) return 0; AccessibilityChildrenVector children = this->children(); if (children.size() < 2) return 0; if (node()->hasTagName(MathMLNames::moverTag)) return children[1].get(); if (node()->hasTagName(MathMLNames::munderoverTag)) return children[2].get(); return 0; } AccessibilityObject* AccessibilityRenderObject::mathBaseObject() { if (!isMathSubscriptSuperscript() && !isMathUnderOver() && !isMathMultiscript()) return 0; AccessibilityChildrenVector children = this->children(); // The base object in question is always the first child. if (children.size() > 0) return children[0].get(); return 0; } AccessibilityObject* AccessibilityRenderObject::mathSubscriptObject() { if (!isMathSubscriptSuperscript() || !node()) return 0; AccessibilityChildrenVector children = this->children(); if (children.size() < 2) return 0; if (node()->hasTagName(MathMLNames::msubTag) || node()->hasTagName(MathMLNames::msubsupTag)) return children[1].get(); return 0; } AccessibilityObject* AccessibilityRenderObject::mathSuperscriptObject() { if (!isMathSubscriptSuperscript() || !node()) return 0; AccessibilityChildrenVector children = this->children(); if (children.size() < 2) return 0; if (node()->hasTagName(MathMLNames::msupTag)) return children[1].get(); if (node()->hasTagName(MathMLNames::msubsupTag)) return children[2].get(); return 0; } String AccessibilityRenderObject::mathFencedOpenString() const { if (!isMathFenced()) return String(); return getAttribute(MathMLNames::openAttr); } String AccessibilityRenderObject::mathFencedCloseString() const { if (!isMathFenced()) return String(); return getAttribute(MathMLNames::closeAttr); } void AccessibilityRenderObject::mathPrescripts(AccessibilityMathMultiscriptPairs& prescripts) { if (!isMathMultiscript() || !node()) return; bool foundPrescript = false; pair prescriptPair; for (Node* child = node()->firstChild(); child; child = child->nextSibling()) { if (foundPrescript) { AccessibilityObject* axChild = axObjectCache()->getOrCreate(child); if (axChild && axChild->isMathElement()) { if (!prescriptPair.first) prescriptPair.first = axChild; else { prescriptPair.second = axChild; prescripts.append(prescriptPair); prescriptPair.first = 0; prescriptPair.second = 0; } } } else if (child->hasTagName(MathMLNames::mprescriptsTag)) foundPrescript = true; } // Handle the odd number of pre scripts case. if (prescriptPair.first) prescripts.append(prescriptPair); } void AccessibilityRenderObject::mathPostscripts(AccessibilityMathMultiscriptPairs& postscripts) { if (!isMathMultiscript() || !node()) return; // In Multiscripts, the post-script elements start after the first element (which is the base) // and continue until a tag is found pair postscriptPair; bool foundBaseElement = false; for (Node* child = node()->firstChild(); child; child = child->nextSibling()) { if (child->hasTagName(MathMLNames::mprescriptsTag)) break; AccessibilityObject* axChild = axObjectCache()->getOrCreate(child); if (axChild && axChild->isMathElement()) { if (!foundBaseElement) foundBaseElement = true; else if (!postscriptPair.first) postscriptPair.first = axChild; else { postscriptPair.second = axChild; postscripts.append(postscriptPair); postscriptPair.first = 0; postscriptPair.second = 0; } } } // Handle the odd number of post scripts case. if (postscriptPair.first) postscripts.append(postscriptPair); } int AccessibilityRenderObject::mathLineThickness() const { if (!isMathFraction()) return -1; return toRenderMathMLFraction(m_renderer)->lineThickness(); } #endif } // namespace WebCore