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android / platform / external / chromium_org / third_party / WebKit / 5c87bf8 / . / Source / WebCore / accessibility / AccessibilityRenderObject.cpp
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/*
* 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 "HTMLTextAreaElement.h"
#include "HitTestRequest.h"
#include "HitTestResult.h"
#include "Image.h"
#include "LocalizedStrings.h"
#include "MathMLNames.h"
#include "NodeList.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 "RenderMenuList.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 "SVGSVGElement.h"
#include "Text.h"
#include "TextControlInnerElements.h"
#include "htmlediting.h"
#include "visible_units.h"
#include <wtf/StdLibExtras.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/unicode/CharacterNames.h>
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> AccessibilityRenderObject::create(RenderObject* renderer)
{
AccessibilityRenderObject* obj = new AccessibilityRenderObject(renderer);
obj->init();
return adoptRef(obj);
}
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 (!firstChild)
return 0;
return axObjectCache()->getOrCreate(firstChild);
}
AccessibilityObject* AccessibilityRenderObject::lastChild() const
{
if (!m_renderer)
return 0;
RenderObject* lastChild = lastChildConsideringContinuation(m_renderer);
if (!lastChild)
return 0;
return axObjectCache()->getOrCreate(lastChild);
}
static inline RenderInline* startOfContinuations(RenderObject* r)
{
if (r->isInlineElementContinuation())
return toRenderInline(r->node()->renderer());
// Blocks with a previous continuation always have a next continuation
if (r->isRenderBlock() && toRenderBlock(r)->inlineElementContinuation())
return toRenderInline(toRenderBlock(r)->inlineElementContinuation()->node()->renderer());
return 0;
}
static inline RenderObject* endOfContinuations(RenderObject* renderer)
{
RenderObject* prev = renderer;
RenderObject* cur = renderer;
if (!cur->isRenderInline() && !cur->isRenderBlock())
return renderer;
while (cur) {
prev = cur;
if (cur->isRenderInline()) {
cur = toRenderInline(cur)->inlineElementContinuation();
ASSERT(cur || !toRenderInline(prev)->continuation());
} else
cur = toRenderBlock(cur)->inlineElementContinuation();
}
return prev;
}
static inline RenderObject* childBeforeConsideringContinuations(RenderInline* r, RenderObject* child)
{
RenderBoxModelObject* curContainer = r;
RenderObject* cur = 0;
RenderObject* prev = 0;
while (curContainer) {
if (curContainer->isRenderInline()) {
cur = curContainer->firstChild();
while (cur) {
if (cur == child)
return prev;
prev = cur;
cur = cur->nextSibling();
}
curContainer = toRenderInline(curContainer)->continuation();
} else if (curContainer->isRenderBlock()) {
if (curContainer == child)
return prev;
prev = curContainer;
curContainer = toRenderBlock(curContainer)->inlineElementContinuation();
}
}
ASSERT_NOT_REACHED();
return 0;
}
static inline bool firstChildIsInlineContinuation(RenderObject* renderer)
{
return renderer->firstChild() && renderer->firstChild()->isInlineElementContinuation();
}
AccessibilityObject* AccessibilityRenderObject::previousSibling() const
{
if (!m_renderer)
return 0;
RenderObject* previousSibling = 0;
// Case 1: The node is a block and is an inline's continuation. In that case, the inline's
// last child is our previous sibling (or further back in the continuation chain)
RenderInline* startOfConts;
if (m_renderer->isRenderBlock() && (startOfConts = startOfContinuations(m_renderer)))
previousSibling = childBeforeConsideringContinuations(startOfConts, m_renderer);
// Case 2: Anonymous block parent of the end of a continuation - skip all the way to before
// the parent of the start, since everything in between will be linked up via the continuation.
else if (m_renderer->isAnonymousBlock() && firstChildIsInlineContinuation(m_renderer)) {
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())
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())
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();
ASSERT(!isWidget || (renderer->isReplaced() && !isImage()));
return isWidget && ariaRoleAttribute() == UnknownRole;
}
bool AccessibilityRenderObject::isFileUploadButton() const
{
if (m_renderer && m_renderer->node() && m_renderer->node()->hasTagName(inputTag)) {
HTMLInputElement* input = static_cast<HTMLInputElement*>(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 (node->hasTagName(aTag) || (node->renderer() && cache->getOrCreate(node->renderer())->isAnchor()))
return static_cast<Element*>(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 = static_cast<Element*>(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 = static_cast<Element*>(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() const
{
if (!m_renderer)
return String();
if (m_renderer->isFileUploadControl())
return toRenderFileUploadControl(m_renderer)->buttonValue();
Node* node = m_renderer->node();
if (node) {
if (Frame* frame = node->document()->frame()) {
// catch stale WebCoreAXObject (see <rdar://problem/3960196>)
if (frame->document() != node->document())
return String();
return plainText(rangeOfContents(node).get(), textIteratorBehaviorForTextRange());
}
}
// Sometimes text fragments don't have Node's associated with them (like when
// CSS content is used to insert text).
if (m_renderer->isText()) {
RenderText* renderTextObject = toRenderText(m_renderer);
if (renderTextObject->isTextFragment())
return String(static_cast<RenderTextFragment*>(m_renderer)->contentString());
}
// return the null string for anonymous text because it is non-trivial to get
// the actual text and, so far, that is not needed
return String();
}
Node* AccessibilityRenderObject::node() const
{
return m_renderer ? m_renderer->node() : 0;
}
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<HTMLElement*> listItems = selectElement->listItems();
if (selectedIndex >= 0 && static_cast<size_t>(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 (parentNode->hasTagName(labelTag))
return static_cast<HTMLLabelElement*>(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.
Vector<FloatQuad> quads;
if (obj->isText())
toRenderText(obj)->absoluteQuads(quads, 0, RenderText::ClipToEllipsis);
else if (isWebArea())
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() && obj->frame()->view())
result.setSize(obj->frame()->view()->contentsSize());
return result;
}
LayoutRect AccessibilityRenderObject::checkboxOrRadioRect() const
{
if (!m_renderer)
return LayoutRect();
HTMLLabelElement* label = labelForElement(static_cast<Element*>(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();
}
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 (!element->hasTagName(aTag))
return 0;
HTMLAnchorElement* anchor = static_cast<HTMLAnchorElement*>(element);
KURL linkURL = anchor->href();
String fragmentIdentifier = linkURL.fragmentIdentifier();
if (fragmentIdentifier.isEmpty())
return 0;
// check if URL is the same as current URL
KURL documentURL = m_renderer->document()->url();
if (!equalIgnoringFragmentIdentifier(documentURL, linkURL))
return 0;
Node* linkedNode = m_renderer->document()->findAnchor(fragmentIdentifier);
if (!linkedNode)
return 0;
// The element we find may not be accessible, so find the first accessible object.
return firstAccessibleObjectFromNode(linkedNode);
}
ESpeak AccessibilityRenderObject::speakProperty() const
{
if (!m_renderer)
return AccessibilityObject::speakProperty();
return m_renderer->style()->speak();
}
void AccessibilityRenderObject::addRadioButtonGroupMembers(AccessibilityChildrenVector& linkedUIElements) const
{
if (!m_renderer || roleValue() != RadioButtonRole)
return;
Node* node = m_renderer->node();
if (!node || !node->hasTagName(inputTag))
return;
HTMLInputElement* input = static_cast<HTMLInputElement*>(node);
// if there's a form, then this is easy
if (input->form()) {
Vector<RefPtr<Node> > 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<NodeList> list = node->document()->getElementsByTagName("input");
unsigned len = list->length();
for (unsigned i = 0; i < len; ++i) {
if (list->item(i)->hasTagName(inputTag)) {
HTMLInputElement* associateElement = static_cast<HTMLInputElement*>(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<Element*> 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<String>& 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* element = m_renderer->node();
if (!element)
return 0;
HTMLLabelElement* label = labelForElement(static_cast<Element*>(element));
if (label && label->renderer())
return axObjectCache()->getOrCreate(label);
return 0;
}
bool AccessibilityRenderObject::ariaIsHidden() const
{
if (equalIgnoringCase(getAttribute(aria_hiddenAttr), "true"))
return true;
// aria-hidden hides this object and any children
AccessibilityObject* object = parentObject();
while (object) {
if (equalIgnoringCase(object->getAttribute(aria_hiddenAttr), "true"))
return true;
object = object->parentObject();
}
return false;
}
bool AccessibilityRenderObject::isAllowedChildOfTree() const
{
// Determine if this is in a tree. If so, we apply special behavior to make it work like an AXOutline.
AccessibilityObject* axObj = parentObject();
bool isInTree = false;
while (axObj) {
if (axObj->isTree()) {
isInTree = true;
break;
}
axObj = axObj->parentObject();
}
// If the object is in a tree, only tree items should be exposed (and the children of tree items).
if (isInTree) {
AccessibilityRole role = roleValue();
if (role != TreeItemRole && role != StaticTextRole)
return false;
}
return true;
}
AccessibilityObjectInclusion AccessibilityRenderObject::accessibilityIsIgnoredBase() const
{
// The following cases can apply to any element that's a subclass of AccessibilityRenderObject.
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;
}
// Anything marked as aria-hidden or a child of something aria-hidden must be hidden.
if (ariaIsHidden())
return IgnoreObject;
// Anything that is a presentational role must be hidden.
if (isPresentationalChildOfAriaRole())
return IgnoreObject;
// Allow the platform to make a decision.
AccessibilityObjectInclusion decision = accessibilityPlatformIncludesObject();
if (decision == IncludeObject)
return IncludeObject;
if (decision == IgnoreObject)
return IgnoreObject;
return DefaultBehavior;
}
bool AccessibilityRenderObject::accessibilityIsIgnored() const
{
// Check first if any of the common reasons cause this element to be ignored.
// Then process other use cases that need to be applied to all the various roles
// that AccessibilityRenderObjects take on.
AccessibilityObjectInclusion decision = accessibilityIsIgnoredBase();
if (decision == IncludeObject)
return false;
if (decision == IgnoreObject)
return true;
// If this element is within a parent that cannot have children, it should not be exposed.
if (isDescendantOfBarrenParent())
return true;
if (roleValue() == IgnoredRole)
return true;
if (roleValue() == PresentationalRole || inheritsPresentationalRole())
return true;
// An ARIA tree can only have tree items and static text as children.
if (!isAllowedChildOfTree())
return true;
// Allow the platform to decide if the attachment is ignored or not.
if (isAttachment())
return accessibilityIgnoreAttachment();
// ignore popup menu items because AppKit does
for (RenderObject* parent = m_renderer->parent(); parent; parent = parent->parent()) {
if (parent->isBoxModelObject() && toRenderBoxModelObject(parent)->isMenuList())
return true;
}
// find out if this element is inside of a label element.
// if so, it may be ignored because it's the label for a checkbox or radio button
AccessibilityObject* controlObject = correspondingControlForLabelElement();
if (controlObject && !controlObject->exposesTitleUIElement() && controlObject->isCheckboxOrRadio())
return true;
// NOTE: BRs always have text boxes now, so the text box check here can be removed
if (m_renderer->isText()) {
// static text beneath MenuItems and MenuButtons are just reported along with the menu item, so it's ignored on an individual level
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 && node->hasTagName(labelTag))
return false;
// Anything that is content editable should not be ignored.
// However, one cannot just call node->rendererIsEditable() since that will ask if its parents
// are also editable. Only the top level content editable region should be exposed.
if (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;
// <span> 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 = static_cast<Element*>(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 (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;
RenderHTMLCanvas* canvas = toRenderHTMLCanvas(m_renderer);
if (canvas->height() <= 1 || canvas->width() <= 1)
return true;
// Otherwise fall through; use presence of help text, title, or description to decide.
}
if (isWebArea() || 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.
if (!helpText().isEmpty() || !title().isEmpty() || !accessibilityDescription().isEmpty())
return false;
// By default, objects should be ignored so that the AX hierarchy is not
// filled with unnecessary items.
return true;
}
bool AccessibilityRenderObject::isLoaded() const
{
return !m_renderer->document()->parser();
}
double AccessibilityRenderObject::estimatedLoadingProgress() const
{
if (!m_renderer)
return 0;
if (isLoaded())
return 1.0;
Page* page = m_renderer->document()->page();
if (!page)
return 0;
return page->progress()->estimatedProgress();
}
int AccessibilityRenderObject::layoutCount() const
{
if (!m_renderer->isRenderView())
return 0;
return toRenderView(m_renderer)->frameView()->layoutCount();
}
String AccessibilityRenderObject::text() const
{
if (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();
ExceptionCode ec = 0;
VisibleSelection visibleSelection = selection();
RefPtr<Range> currentSelectionRange = visibleSelection.toNormalizedRange();
if (!currentSelectionRange || !currentSelectionRange->intersectsNode(node, ec))
return PlainTextRange();
int start = indexForVisiblePosition(visibleSelection.start());
int end = indexForVisiblePosition(visibleSelection.end());
return PlainTextRange(start, end - start);
}
String AccessibilityRenderObject::selectedText() const
{
ASSERT(isTextControl());
if (isPasswordField())
return String(); // need to return something distinct from empty string
if (isNativeTextControl()) {
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 static_cast<Element*>(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() && m_renderer->node()->hasTagName(aTag)) {
if (HTMLAnchorElement* anchor = static_cast<HTMLAnchorElement*>(anchorElement()))
return anchor->href();
}
if (isWebArea())
return m_renderer->document()->url();
if (isImage() && m_renderer->node() && m_renderer->node()->hasTagName(imgTag))
return static_cast<HTMLImageElement*>(m_renderer->node())->src();
if (isInputImage())
return static_cast<HTMLInputElement*>(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 = static_cast<Element*>(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<Element*> 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;
Node* focusedNode = document->focusedNode();
if (!focusedNode)
return false;
// A web area is represented by the Document node in the DOM tree, which isn't focusable.
// Check instead if the frame's selection controller is focused
if (focusedNode == m_renderer->node()
|| (roleValue() == WebAreaRole && document->frame()->selection()->isFocusedAndActive()))
return true;
return false;
}
void AccessibilityRenderObject::setFocused(bool on)
{
if (!canSetFocusAttribute())
return;
Document* document = this->document();
if (!on)
document->setFocusedNode(0);
else {
Node* node = this->node();
if (node && node->isElementNode()) {
// 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->focusedNode() == node)
document->setFocusedNode(0);
toElement(node)->focus();
} else
document->setFocusedNode(node);
}
}
void AccessibilityRenderObject::setSelectedRows(AccessibilityChildrenVector& selectedRows)
{
// Setting selected only makes sense in trees and tables (and tree-tables).
AccessibilityRole role = roleValue();
if (role != TreeRole && role != TreeGridRole && role != TableRole)
return;
bool isMulti = isMultiSelectable();
unsigned count = selectedRows.size();
if (count > 1 && !isMulti)
count = 1;
for (unsigned k = 0; k < count; ++k)
selectedRows[k]->setSelected(true);
}
void AccessibilityRenderObject::setValue(const String& string)
{
if (!m_renderer || !m_renderer->node() || !m_renderer->node()->isElementNode())
return;
Element* element = static_cast<Element*>(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.
static_cast<HTMLInputElement*>(element)->setValue(string);
} else if (renderer->isTextArea()) {
// FIXME: This is not safe! Other elements could have a TextArea renderer.
static_cast<HTMLTextAreaElement*>(element)->setValue(string);
}
}
void AccessibilityRenderObject::ariaOwnsElements(AccessibilityChildrenVector& axObjects) const
{
Vector<Element*> 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<HTMLCollection> links = document->links();
for (unsigned i = 0; Node* curr = links->item(i); i++) {
RenderObject* obj = curr->renderer();
if (obj) {
RefPtr<AccessibilityObject> axobj = document->axObjectCache()->getOrCreate(obj);
ASSERT(axobj);
if (!axobj->accessibilityIsIgnored() && axobj->isLink())
result.append(axobj);
} else {
Node* parent = curr->parentNode();
if (parent && curr->hasTagName(areaTag) && parent->hasTagName(mapTag)) {
AccessibilityImageMapLink* areaObject = static_cast<AccessibilityImageMapLink*>(axObjectCache()->getOrCreate(ImageMapLinkRole));
areaObject->setHTMLAreaElement(static_cast<HTMLAreaElement*>(curr));
areaObject->setHTMLMapElement(static_cast<HTMLMapElement*>(parent));
areaObject->setParent(accessibilityParentForImageMap(static_cast<HTMLMapElement*>(parent)));
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);
ExceptionCode ec = 0;
RefPtr<Range> range = Range::create(m_renderer->document());
range->selectNodeContents(node, ec);
CharacterIterator it(range.get());
it.advance(index - 1);
return VisiblePosition(Position(it.range()->endContainer(ec), it.range()->endOffset(ec), Position::PositionIsOffsetInAnchor), UPSTREAM);
}
int AccessibilityRenderObject::indexForVisiblePosition(const VisiblePosition& pos) const
{
if (isNativeTextControl()) {
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;
ExceptionCode ec = 0;
RefPtr<Range> range = Range::create(m_renderer->document());
range->setStart(node, 0, ec);
range->setEnd(indexPosition, ec);
#if PLATFORM(GTK)
// We need to consider replaced elements for GTK, as they will be
// presented with the 'object replacement character' (0xFFFC).
return TextIterator::rangeLength(range.get(), true);
#else
return TextIterator::rangeLength(range.get());
#endif
}
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*>(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<Range> 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 = static_cast<FrameView*>(widget)->frame();
if (!frame)
break;
renderView = frame->document()->renderView();
frameView = static_cast<FrameView*>(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<int>& 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;
HTMLMapElement* map = static_cast<HTMLMapElement*>(area->parentNode());
AccessibilityObject* parent = accessibilityParentForImageMap(map);
if (!parent)
return 0;
AccessibilityObject::AccessibilityChildrenVector children = parent->children();
unsigned count = children.size();
for (unsigned k = 0; k < count; ++k) {
if (children[k]->elementRect().contains(point))
return children[k].get();
}
return 0;
}
AccessibilityObject* AccessibilityRenderObject::remoteSVGElementHitTest(const IntPoint& point) const
{
AccessibilityObject* remote = remoteSVGRootElement();
if (!remote)
return 0;
IntSize offsetPoint = point - roundedIntPoint(boundingBoxRect().location());
return remote->accessibilityHitTest(toPoint(offsetPoint));
}
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);
HitTestResult hitTestResult = HitTestResult(point);
layer->hitTest(request, hitTestResult);
if (!hitTestResult.innerNode())
return 0;
Node* node = hitTestResult.innerNode()->shadowAncestorNode();
if (node->hasTagName(areaTag))
return accessibilityImageMapHitTest(static_cast<HTMLAreaElement*>(node), point);
if (node->hasTagName(optionTag))
node = static_cast<HTMLOptionElement*>(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::shouldFocusActiveDescendant() const
{
switch (ariaRoleAttribute()) {
case GroupRole:
case ComboBoxRole:
case ListBoxRole:
case MenuRole:
case MenuBarRole:
case RadioGroupRole:
case RowRole:
case PopUpButtonRole:
case ProgressIndicatorRole:
case ToolbarRole:
case OutlineRole:
case TreeRole:
case GridRole:
/* FIXME: replace these with actual roles when they are added to AccessibilityRole
composite
alert
alertdialog
status
timer
*/
return true;
default:
return false;
}
}
AccessibilityObject* AccessibilityRenderObject::activeDescendant() const
{
if (!m_renderer)
return 0;
if (m_renderer->node() && !m_renderer->node()->isElementNode())
return 0;
Element* element = static_cast<Element*>(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 = static_cast<Element*>(renderer()->node());
if (!element)
return;
Document* doc = renderer()->document();
if (!doc->frame()->selection()->isFocusedAndActive() || doc->focusedNode() != element)
return;
AccessibilityRenderObject* activedescendant = static_cast<AccessibilityRenderObject*>(activeDescendant());
if (activedescendant && shouldFocusActiveDescendant())
doc->axObjectCache()->postNotification(m_renderer, AXObjectCache::AXActiveDescendantChanged, true);
}
AccessibilityObject* AccessibilityRenderObject::correspondingControlForLabelElement() const
{
HTMLLabelElement* labelElement = labelElementContainer();
if (!labelElement)
return 0;
HTMLElement* correspondingControl = labelElement->control();
if (!correspondingControl)
return 0;
// 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;
Node* node = m_renderer->node();
if (node && node->isHTMLElement()) {
HTMLLabelElement* label = labelForElement(static_cast<Element*>(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())
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 && node->hasTagName(inputTag))
return ariaHasPopup() ? PopUpButtonRole : ButtonRole;
if (isSVGImage())
return SVGRootRole;
return ImageRole;
}
if (node && node->hasTagName(canvasTag))
return CanvasRole;
if (cssBox && cssBox->isRenderView())
return WebAreaRole;
if (cssBox && cssBox->isTextField())
return TextFieldRole;
if (cssBox && cssBox->isTextArea())
return TextAreaRole;
if (node && node->hasTagName(inputTag)) {
HTMLInputElement* input = static_cast<HTMLInputElement*>(node);
if (input->isCheckbox())
return CheckBoxRole;
if (input->isRadioButton())
return RadioButtonRole;
if (input->isTextButton())
return buttonRoleType();
}
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;
#endif
#if ENABLE(MATHML)
if (node && node->hasTagName(MathMLNames::mathTag))
return DocumentMathRole;
#endif
if (node && node->hasTagName(ddTag))
return DefinitionListDefinitionRole;
if (node && node->hasTagName(dtTag))
return DefinitionListTermRole;
if (node && (node->hasTagName(rpTag) || node->hasTagName(rtTag)))
return AnnotationRole;
#if PLATFORM(GTK)
// Gtk ATs expect all tables, data and layout, to be exposed as tables.
if (node && (node->hasTagName(tdTag) || node->hasTagName(thTag)))
return CellRole;
if (node && node->hasTagName(trTag))
return RowRole;
if (node && node->hasTagName(tableTag))
return TableRole;
#endif
// Table sections should be ignored.
if (m_renderer->isTableSection())
return IgnoredRole;
if (m_renderer->isHR())
return HorizontalRuleRole;
if (node && node->hasTagName(pTag))
return ParagraphRole;
if (node && node->hasTagName(labelTag))
return LabelRole;
if (node && node->hasTagName(divTag))
return DivRole;
if (node && node->hasTagName(formTag))
return FormRole;
if (node && node->hasTagName(articleTag))
return DocumentArticleRole;
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;
// 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, <li> becomes presentational from <ul>.
// http://www.w3.org/WAI/PF/aria/complete#presentation
DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, listItemParents, ());
HashSet<QualifiedName>* 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<AccessibilityRenderObject*>(parent)->node();
if (!elementNode || !elementNode->isElementNode())
continue;
// If native tag of the parent element matches an acceptable name, then return
// based on its presentational status.
if (possibleParentTagNames->contains(static_cast<Element*>(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
{
if (equalIgnoringCase(getAttribute(aria_readonlyAttr), "true"))
return false;
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 (Node* current = map->firstChild(); current; current = current->traverseNextNode(map)) {
// add an <area> element for this child if it has a link
if (current->hasTagName(areaTag) && current->isLink()) {
AccessibilityImageMapLink* areaObject = static_cast<AccessibilityImageMapLink*>(axObjectCache()->getOrCreate(ImageMapLinkRole));
areaObject->setHTMLAreaElement(static_cast<HTMLAreaElement*>(current));
areaObject->setHTMLMapElement(map);
areaObject->setParent(this);
m_children.append(areaObject);
}
}
}
void AccessibilityRenderObject::updateChildrenIfNecessary()
{
if (needsToUpdateChildren())
clearChildren();
AccessibilityObject::updateChildrenIfNecessary();
}
void AccessibilityRenderObject::addTextFieldChildren()
{
Node* node = this->node();
if (!node || !node->hasTagName(inputTag))
return;
HTMLInputElement* input = static_cast<HTMLInputElement*>(node);
HTMLElement* spinButtonElement = input->innerSpinButtonElement();
if (!spinButtonElement || !spinButtonElement->isSpinButtonElement())
return;
AccessibilitySpinButton* axSpinButton = static_cast<AccessibilitySpinButton*>(axObjectCache()->getOrCreate(SpinButtonRole));
axSpinButton->setSpinButtonElement(static_cast<SpinButtonElement*>(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<SVGImage*>(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 = static_cast<SVGDocument*>(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<AccessibilityObject> 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())
static_cast<Element*>(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 && anchor->hasTagName(aTag))
return static_cast<HTMLAnchorElement*>(anchor)->href();
}
return stringValue();
}
bool AccessibilityRenderObject::isLinked() const
{
if (!isLinkable(*this))
return false;
Element* anchor = anchorElement();
if (!anchor || !anchor->hasTagName(aTag))
return false;
return !static_cast<HTMLAnchorElement*>(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() == TDNONE;
}
bool AccessibilityRenderObject::hasSameFont(RenderObject* renderer) const
{
if (!m_renderer || !renderer)
return false;
return m_renderer->style()->fontDescription().family() == renderer->style()->fontDescription().family();
}
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() & UNDERLINE;
}
String AccessibilityRenderObject::nameForMSAA() const
{
if (m_renderer && m_renderer->isText())
return textUnderElement();
return title();
}
static bool shouldReturnTagNameAsRoleForMSAA(const Element& element)
{
// See "document structure",
// https://wiki.mozilla.org/Accessibility/AT-Windows-API
// FIXME: Add the other tag names that should be returned as the role.
return element.hasTagName(h1Tag) || element.hasTagName(h2Tag)
|| element.hasTagName(h3Tag) || element.hasTagName(h4Tag)
|| element.hasTagName(h5Tag) || element.hasTagName(h6Tag);
}
String AccessibilityRenderObject::stringRoleForMSAA() const
{
if (!m_renderer)
return String();
Node* node = m_renderer->node();
if (!node || !node->isElementNode())
return String();
Element* element = static_cast<Element*>(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<RenderText*>(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(toSize(point), RenderLayer::ScrollOffsetClamped);
}
} // namespace WebCore