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AccessibilityNodeObject.cpp
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AccessibilityNodeObject.cpp
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/*
* Copyright (C) 2012, Google 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 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 "AccessibilityNodeObject.h"
#include "AXLogger.h"
#include "AXObjectCache.h"
#include "AccessibilityImageMapLink.h"
#include "AccessibilityLabel.h"
#include "AccessibilityList.h"
#include "AccessibilityListBox.h"
#include "AccessibilitySpinButton.h"
#include "AccessibilityTable.h"
#include "DateComponents.h"
#include "Editing.h"
#include "ElementAncestorIteratorInlines.h"
#include "ElementChildIteratorInlines.h"
#include "Event.h"
#include "EventHandler.h"
#include "EventNames.h"
#include "FloatRect.h"
#include "FrameLoader.h"
#include "FrameSelection.h"
#include "HTMLAudioElement.h"
#include "HTMLCanvasElement.h"
#include "HTMLDetailsElement.h"
#include "HTMLFieldSetElement.h"
#include "HTMLFormElement.h"
#include "HTMLImageElement.h"
#include "HTMLInputElement.h"
#include "HTMLLabelElement.h"
#include "HTMLLegendElement.h"
#include "HTMLNames.h"
#include "HTMLOptionElement.h"
#include "HTMLParserIdioms.h"
#include "HTMLSelectElement.h"
#include "HTMLSlotElement.h"
#include "HTMLSummaryElement.h"
#include "HTMLTextAreaElement.h"
#include "HTMLTextFormControlElement.h"
#include "HTMLVideoElement.h"
#include "HitTestSource.h"
#include "KeyboardEvent.h"
#include "LocalFrame.h"
#include "LocalFrameView.h"
#include "LocalizedStrings.h"
#include "MathMLElement.h"
#include "MathMLNames.h"
#include "NodeList.h"
#include "NodeTraversal.h"
#include "ProgressTracker.h"
#include "RenderImage.h"
#include "RenderView.h"
#include "SVGElement.h"
#include "ShadowRoot.h"
#include "Text.h"
#include "TextControlInnerElements.h"
#include "TextIterator.h"
#include "UserGestureIndicator.h"
#include "VisibleUnits.h"
#include <wtf/Scope.h>
#include <wtf/SetForScope.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/unicode/CharacterNames.h>
namespace WebCore {
using namespace HTMLNames;
static String accessibleNameForNode(Node&, Node* labelledbyNode = nullptr);
static void appendNameToStringBuilder(StringBuilder&, String&&, bool prependSpace = true);
AccessibilityNodeObject::AccessibilityNodeObject(Node* node)
: AccessibilityObject()
, m_node(node)
{
}
AccessibilityNodeObject::~AccessibilityNodeObject()
{
ASSERT(isDetached());
}
void AccessibilityNodeObject::init()
{
#ifndef NDEBUG
ASSERT(!m_initialized);
m_initialized = true;
#endif
AccessibilityObject::init();
}
Ref<AccessibilityNodeObject> AccessibilityNodeObject::create(Node& node)
{
return adoptRef(*new AccessibilityNodeObject(&node));
}
void AccessibilityNodeObject::detachRemoteParts(AccessibilityDetachmentType detachmentType)
{
// AccessibilityObject calls clearChildren.
AccessibilityObject::detachRemoteParts(detachmentType);
m_node = nullptr;
}
AccessibilityObject* AccessibilityNodeObject::firstChild() const
{
auto* currentChild = node() ? node()->firstChild() : nullptr;
if (!currentChild)
return nullptr;
auto* cache = axObjectCache();
if (!cache)
return nullptr;
auto* axCurrentChild = cache->getOrCreate(*currentChild);
while (!axCurrentChild && currentChild) {
currentChild = currentChild->nextSibling();
axCurrentChild = cache->getOrCreate(currentChild);
}
return axCurrentChild;
}
AccessibilityObject* AccessibilityNodeObject::lastChild() const
{
if (!node())
return nullptr;
Node* lastChild = node()->lastChild();
if (!lastChild)
return nullptr;
auto objectCache = axObjectCache();
return objectCache ? objectCache->getOrCreate(*lastChild) : nullptr;
}
AccessibilityObject* AccessibilityNodeObject::previousSibling() const
{
if (!node())
return nullptr;
Node* previousSibling = node()->previousSibling();
if (!previousSibling)
return nullptr;
auto objectCache = axObjectCache();
return objectCache ? objectCache->getOrCreate(*previousSibling) : nullptr;
}
AccessibilityObject* AccessibilityNodeObject::nextSibling() const
{
if (!node())
return nullptr;
Node* nextSibling = node()->nextSibling();
if (!nextSibling)
return nullptr;
auto objectCache = axObjectCache();
return objectCache ? objectCache->getOrCreate(*nextSibling) : nullptr;
}
AccessibilityObject* AccessibilityNodeObject::parentObjectIfExists() const
{
return parentObject();
}
AccessibilityObject* AccessibilityNodeObject::ownerParentObject() const
{
auto owners = this->owners();
ASSERT(owners.size() <= 1);
return owners.size() ? dynamicDowncast<AccessibilityObject>(owners.first().get()) : nullptr;
}
AccessibilityObject* AccessibilityNodeObject::parentObject() const
{
if (!node())
return nullptr;
if (auto* ownerParent = ownerParentObject())
return ownerParent;
Node* parentObj = node()->parentNode();
if (!parentObj)
return nullptr;
if (AXObjectCache* cache = axObjectCache())
return cache->getOrCreate(*parentObj);
return nullptr;
}
LayoutRect AccessibilityNodeObject::checkboxOrRadioRect() const
{
auto labels = Accessibility::labelsForElement(element());
if (labels.isEmpty())
return boundingBoxRect();
auto* cache = axObjectCache();
if (!cache)
return boundingBoxRect();
// A checkbox or radio button should encompass its label.
auto selfRect = boundingBoxRect();
for (auto& label : labels) {
if (label->renderer()) {
if (auto* axLabel = cache->getOrCreate(label.get()))
selfRect.unite(axLabel->elementRect());
}
}
return selfRect;
}
LayoutRect AccessibilityNodeObject::elementRect() const
{
if (RefPtr input = dynamicDowncast<HTMLInputElement>(node()); input && (input->isCheckbox() || input->isRadioButton()))
return checkboxOrRadioRect();
return boundingBoxRect();
}
LayoutRect AccessibilityNodeObject::boundingBoxRect() const
{
if (hasDisplayContents()) {
LayoutRect contentsRect;
for (const auto& child : const_cast<AccessibilityNodeObject*>(this)->children(false))
contentsRect.unite(child->elementRect());
if (!contentsRect.isEmpty())
return contentsRect;
}
// Non-display:contents AccessibilityNodeObjects have no mechanism to return a size or position.
// Instead, let's return a box at the position of an ancestor that does have a position, make it
// the width of that ancestor, and about the height of a line of text, so it's clear this object is
// a descendant of that ancestor.
for (RefPtr<AccessibilityObject> ancestor = parentObject(); ancestor; ancestor = ancestor->parentObject()) {
if (!ancestor->renderer())
continue;
auto ancestorRect = ancestor->elementRect();
if (ancestorRect.isEmpty())
continue;
return {
ancestorRect.location(),
LayoutSize(ancestorRect.width(), LayoutUnit(std::min(10.0f, ancestorRect.height().toFloat())))
};
}
return { };
}
Document* AccessibilityNodeObject::document() const
{
if (!node())
return nullptr;
return &node()->document();
}
LocalFrameView* AccessibilityNodeObject::documentFrameView() const
{
if (auto* node = this->node())
return node->document().view();
return AccessibilityObject::documentFrameView();
}
AccessibilityRole AccessibilityNodeObject::determineAccessibilityRole()
{
AXTRACE("AccessibilityNodeObject::determineAccessibilityRole"_s);
if ((m_ariaRole = determineAriaRoleAttribute()) != AccessibilityRole::Unknown)
return m_ariaRole;
return determineAccessibilityRoleFromNode();
}
bool AccessibilityNodeObject::matchesTextAreaRole() const
{
return is<HTMLTextAreaElement>(node()) || hasContentEditableAttributeSet();
}
AccessibilityRole AccessibilityNodeObject::determineAccessibilityRoleFromNode(TreatStyleFormatGroupAsInline treatStyleFormatGroupAsInline) const
{
AXTRACE("AccessibilityNodeObject::determineAccessibilityRoleFromNode"_s);
RefPtr node = this->node();
if (!node)
return AccessibilityRole::Unknown;
if (node->isTextNode())
return AccessibilityRole::StaticText;
RefPtr element = dynamicDowncast<HTMLElement>(*node);
if (!element)
return AccessibilityRole::Unknown;
if (element->isLink())
return AccessibilityRole::WebCoreLink;
if (RefPtr selectElement = dynamicDowncast<HTMLSelectElement>(*element))
return selectElement->multiple() ? AccessibilityRole::ListBox : AccessibilityRole::PopUpButton;
if (RefPtr imgElement = dynamicDowncast<HTMLImageElement>(*element); imgElement && imgElement->hasAttributeWithoutSynchronization(usemapAttr))
return AccessibilityRole::ImageMap;
if (element->hasTagName(liTag))
return AccessibilityRole::ListItem;
if (element->hasTagName(buttonTag))
return buttonRoleType();
if (element->hasTagName(legendTag))
return AccessibilityRole::Legend;
if (element->hasTagName(canvasTag))
return AccessibilityRole::Canvas;
if (RefPtr input = dynamicDowncast<HTMLInputElement>(*element))
return roleFromInputElement(*input);
if (matchesTextAreaRole())
return AccessibilityRole::TextArea;
if (headingLevel())
return AccessibilityRole::Heading;
if (element->hasTagName(codeTag))
return AccessibilityRole::Code;
if (element->hasTagName(delTag) || element->hasTagName(sTag))
return AccessibilityRole::Deletion;
if (element->hasTagName(insTag))
return AccessibilityRole::Insertion;
if (element->hasTagName(subTag))
return AccessibilityRole::Subscript;
if (element->hasTagName(supTag))
return AccessibilityRole::Superscript;
if (element->hasTagName(strongTag))
return AccessibilityRole::Strong;
if (element->hasTagName(kbdTag)
|| element->hasTagName(preTag)
|| element->hasTagName(sampTag)
|| element->hasTagName(varTag)
|| element->hasTagName(citeTag))
return treatStyleFormatGroupAsInline == TreatStyleFormatGroupAsInline::Yes ? AccessibilityRole::Inline : AccessibilityRole::TextGroup;
if (element->hasTagName(ddTag))
return AccessibilityRole::DescriptionListDetail;
if (element->hasTagName(dtTag))
return AccessibilityRole::DescriptionListTerm;
if (element->hasTagName(dlTag))
return AccessibilityRole::DescriptionList;
if (element->hasTagName(menuTag)
|| element->hasTagName(olTag)
|| element->hasTagName(ulTag))
return AccessibilityRole::List;
if (element->hasTagName(fieldsetTag))
return AccessibilityRole::Group;
if (element->hasTagName(figureTag))
return AccessibilityRole::Figure;
if (element->hasTagName(pTag))
return AccessibilityRole::Paragraph;
if (is<HTMLLabelElement>(*element))
return AccessibilityRole::Label;
if (element->hasTagName(dfnTag)) {
// Confusingly, the `dfn` element represents a term being defined, making it equivalent to the "term" ARIA
// role rather than the "definition" ARIA role. The "definition" ARIA role has no HTML equivalent.
// https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-dfn-element
// https://w3c.github.io/aria/#term and https://w3c.github.io/aria/#definition
return AccessibilityRole::Term;
}
if (element->hasTagName(divTag) && !isNonNativeTextControl())
return AccessibilityRole::Generic;
if (is<HTMLFormElement>(*element))
return AccessibilityRole::Form;
if (element->hasTagName(articleTag))
return AccessibilityRole::DocumentArticle;
if (element->hasTagName(mainTag))
return AccessibilityRole::LandmarkMain;
if (element->hasTagName(navTag))
return AccessibilityRole::LandmarkNavigation;
if (element->hasTagName(asideTag)) {
if (ariaRoleAttribute() == AccessibilityRole::LandmarkComplementary || !isDescendantOfElementType({ asideTag, articleTag, sectionTag, navTag }))
return AccessibilityRole::LandmarkComplementary;
// https://w3c.github.io/html-aam/#el-aside
// When within a sectioning content elements, complementary landmarks must have accnames to acquire the role.
return WebCore::hasAccNameAttribute(*element) ? AccessibilityRole::LandmarkComplementary : AccessibilityRole::Generic;
}
if (element->hasTagName(searchTag))
return AccessibilityRole::LandmarkSearch;
if (element->hasTagName(sectionTag)) {
// https://w3c.github.io/html-aam/#el-section
// The default role attribute value for the section element, region, became a landmark in ARIA 1.1.
// The HTML AAM spec says it is "strongly recommended" that ATs only convey and provide navigation
// for section elements which have names.
return WebCore::hasAccNameAttribute(*element) ? AccessibilityRole::LandmarkRegion : AccessibilityRole::TextGroup;
}
if (element->hasTagName(addressTag))
return AccessibilityRole::Group;
if (element->hasTagName(blockquoteTag))
return AccessibilityRole::Blockquote;
if (element->hasTagName(captionTag) || element->hasTagName(figcaptionTag))
return AccessibilityRole::Caption;
if (element->hasTagName(dialogTag))
return AccessibilityRole::ApplicationDialog;
if (element->hasTagName(markTag) || equalLettersIgnoringASCIICase(getAttribute(roleAttr), "mark"_s))
return AccessibilityRole::Mark;
if (is<HTMLDetailsElement>(*element))
return AccessibilityRole::Details;
if (RefPtr summaryElement = dynamicDowncast<HTMLSummaryElement>(*element); summaryElement && summaryElement->isActiveSummary())
return AccessibilityRole::Summary;
// http://rawgit.com/w3c/aria/master/html-aam/html-aam.html
// Output elements should be mapped to status role.
if (isOutput())
return AccessibilityRole::ApplicationStatus;
#if ENABLE(VIDEO)
if (is<HTMLVideoElement>(*element))
return AccessibilityRole::Video;
if (is<HTMLAudioElement>(*element))
return AccessibilityRole::Audio;
#endif
#if ENABLE(MODEL_ELEMENT)
if (element->hasTagName(modelTag))
return AccessibilityRole::Model;
#endif
// The HTML element should not be exposed as an element. That's what the RenderView element does.
if (element->hasTagName(htmlTag))
return AccessibilityRole::Ignored;
// 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.
// https://w3c.github.io/html-aam/#el-header
if (element->hasTagName(headerTag)) {
if (!isDescendantOfElementType({ articleTag, asideTag, mainTag, navTag, sectionTag }))
return AccessibilityRole::LandmarkBanner;
return AccessibilityRole::Generic;
}
// http://webkit.org/b/190138 Footers should become contentInfo's if scoped to body (and consequently become a landmark).
// It should remain a footer if scoped to main, sectioning elements (article, aside, nav, section) or root sectioning element (blockquote, details, dialog, fieldset, figure, td).
// https://w3c.github.io/html-aam/#el-footer
if (element->hasTagName(footerTag)) {
if (!isDescendantOfElementType({ articleTag, asideTag, navTag, sectionTag, mainTag, blockquoteTag, detailsTag, dialogTag, fieldsetTag, figureTag, tdTag }))
return AccessibilityRole::LandmarkContentInfo;
return AccessibilityRole::Footer;
}
if (element->hasTagName(timeTag))
return AccessibilityRole::Time;
if (element->hasTagName(hrTag))
return AccessibilityRole::HorizontalRule;
if (element->hasTagName(emTag))
return AccessibilityRole::Emphasis;
if (element->hasTagName(hgroupTag))
return AccessibilityRole::Group;
// If the element does not have role, but it has ARIA attributes, or accepts tab focus, accessibility should fallback to exposing it as a group.
if (supportsARIAAttributes() || canSetFocusAttribute() || element->isFocusable())
return AccessibilityRole::Group;
return AccessibilityRole::Unknown;
}
AccessibilityRole AccessibilityNodeObject::roleFromInputElement(const HTMLInputElement& input) const
{
AXTRACE("AccessibilityNodeObject::roleFromInputElement"_s);
ASSERT(dynamicDowncast<HTMLInputElement>(node()) == &input);
if (input.isTextButton())
return buttonRoleType();
if (input.isSwitch())
return AccessibilityRole::Switch;
if (input.isCheckbox())
return AccessibilityRole::Checkbox;
if (input.isRadioButton())
return AccessibilityRole::RadioButton;
if (input.isTextField()) {
// Text fields may have a combobox ancestor, in which case we want to return role combobox.
// This was ARIA 1.1 practice, but it has been recommended against since. Keeping this heuristics here in order to support those sites that are still using this structure.
bool foundCombobox = false;
for (RefPtr ancestor = parentObject(); ancestor; ancestor = ancestor->parentObject()) {
if (ancestor->isComboBox()) {
foundCombobox = true;
break;
}
if (!ancestor->isGroup() && ancestor->roleValue() != AccessibilityRole::Generic)
break;
}
if (foundCombobox)
return AccessibilityRole::ComboBox;
return input.isSearchField() ? AccessibilityRole::SearchField : AccessibilityRole::TextField;
}
if (input.isDateField() || input.isDateTimeLocalField() || input.isMonthField() || input.isTimeField() || input.isWeekField())
return AccessibilityRole::DateTime;
if (input.isFileUpload())
return AccessibilityRole::Button;
#if ENABLE(INPUT_TYPE_COLOR)
if (input.isColorControl())
return AccessibilityRole::ColorWell;
#endif
if (input.isInputTypeHidden())
return AccessibilityRole::Ignored;
if (input.isRangeControl())
return AccessibilityRole::Slider;
// All other input type is treated as a text field.
return AccessibilityRole::TextField;
}
bool AccessibilityNodeObject::isDescendantOfElementType(const HashSet<QualifiedName>& tagNames) const
{
if (!m_node)
return false;
for (auto& ancestorElement : ancestorsOfType<Element>(*m_node)) {
if (tagNames.contains(ancestorElement.tagQName()))
return true;
}
return false;
}
void AccessibilityNodeObject::updateChildrenIfNecessary()
{
if (needsToUpdateChildren())
clearChildren();
AccessibilityObject::updateChildrenIfNecessary();
}
void AccessibilityNodeObject::clearChildren()
{
AccessibilityObject::clearChildren();
m_childrenDirty = false;
}
void AccessibilityNodeObject::updateOwnedChildren()
{
for (RefPtr child : ownedObjects()) {
// If the child already exists as a DOM child, but is also in the owned objects, then
// we need to re-order this child in the aria-owns order.
m_children.removeFirst(child);
addChild(child.get());
}
}
void AccessibilityNodeObject::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_childrenInitialized);
m_childrenInitialized = true;
auto clearDirtySubtree = makeScopeExit([&] {
m_subtreeDirty = false;
});
WeakPtr node = this->node();
if (!node || !canHaveChildren())
return;
// The only time we add children from the DOM tree to a node with a renderer is when it's a canvas.
if (renderer() && !node->hasTagName(canvasTag))
return;
auto objectCache = axObjectCache();
if (!objectCache)
return;
for (auto* child = node->firstChild(); child; child = child->nextSibling())
addChild(objectCache->getOrCreate(*child));
updateOwnedChildren();
}
bool AccessibilityNodeObject::canHaveChildren() const
{
// When <noscript> is not being used (its renderer() == 0), ignore its children.
if (node() && !renderer() && node()->hasTagName(noscriptTag))
return false;
// If this is an AccessibilityRenderObject, then it's okay if this object
// doesn't have a node - there are some renderers that don't have associated
// nodes, like scroll areas and css-generated text.
// Elements that should not have children.
switch (roleValue()) {
case AccessibilityRole::Button:
#if !USE(ATSPI)
// GTK/ATSPI layout tests expect popup buttons to have children.
case AccessibilityRole::PopUpButton:
#endif
case AccessibilityRole::Checkbox:
case AccessibilityRole::RadioButton:
case AccessibilityRole::Tab:
case AccessibilityRole::ToggleButton:
case AccessibilityRole::StaticText:
case AccessibilityRole::ListBoxOption:
case AccessibilityRole::ScrollBar:
case AccessibilityRole::ProgressIndicator:
case AccessibilityRole::Switch:
case AccessibilityRole::MenuItemCheckbox:
case AccessibilityRole::MenuItemRadio:
case AccessibilityRole::Splitter:
case AccessibilityRole::Meter:
return false;
default:
return true;
}
}
AXCoreObject::AccessibilityChildrenVector AccessibilityNodeObject::visibleChildren()
{
// Only listboxes are asked for their visible children.
// Native list boxes would be AccessibilityListBoxes, so only check for aria list boxes.
if (ariaRoleAttribute() != AccessibilityRole::ListBox)
return { };
if (!childrenInitialized())
addChildren();
AccessibilityChildrenVector result;
for (const auto& child : children()) {
if (!child->isOffScreen())
result.append(child);
}
return result;
}
bool AccessibilityNodeObject::computeAccessibilityIsIgnored() const
{
#ifndef NDEBUG
// Double-check that an AccessibilityObject is never accessed before
// it's been initialized.
ASSERT(m_initialized);
#endif
if (!node())
return true;
// Handle non-rendered text that is exposed through aria-hidden=false.
if (node() && node()->isTextNode() && !renderer()) {
// Fallback content in iframe nodes should be ignored.
if (node()->parentNode() && node()->parentNode()->hasTagName(iframeTag) && node()->parentNode()->renderer())
return true;
// Whitespace only text elements should be ignored when they have no renderer.
if (stringValue().containsOnly<isASCIIWhitespace>())
return true;
}
AccessibilityObjectInclusion decision = defaultObjectInclusion();
if (decision == AccessibilityObjectInclusion::IncludeObject)
return false;
if (decision == AccessibilityObjectInclusion::IgnoreObject)
return true;
// FIXME: We should return true for node-only objects within display:none containers, but we don't.
auto role = roleValue();
return role == AccessibilityRole::Ignored || role == AccessibilityRole::Unknown;
}
bool AccessibilityNodeObject::canvasHasFallbackContent() const
{
RefPtr canvasElement = dynamicDowncast<HTMLCanvasElement>(node());
// If it has any children that are elements, we'll assume it might be fallback
// content. If it has no children or its only children are not elements
// (e.g. just text nodes), it doesn't have fallback content.
return canvasElement && childrenOfType<Element>(*canvasElement).first();
}
bool AccessibilityNodeObject::isNativeTextControl() const
{
if (is<HTMLTextAreaElement>(node()))
return true;
RefPtr input = dynamicDowncast<HTMLInputElement>(node());
return input && (input->isText() || input->isNumberField());
}
bool AccessibilityNodeObject::isSearchField() const
{
Node* node = this->node();
if (!node)
return false;
if (roleValue() == AccessibilityRole::SearchField)
return true;
RefPtr inputElement = dynamicDowncast<HTMLInputElement>(*node);
if (!inputElement)
return false;
// Some websites don't label their search fields as such. However, they will
// use the word "search" in either the form or input type. This won't catch every case,
// but it will catch google.com for example.
// Check the node name of the input type, sometimes it's "search".
const AtomString& nameAttribute = getAttribute(nameAttr);
if (nameAttribute.containsIgnoringASCIICase("search"_s))
return true;
// Check the form action and the name, which will sometimes be "search".
RefPtr form = inputElement->form();
if (form && (form->name().containsIgnoringASCIICase("search"_s) || form->action().containsIgnoringASCIICase("search"_s)))
return true;
return false;
}
bool AccessibilityNodeObject::isNativeImage() const
{
Node* node = this->node();
if (!node)
return false;
if (is<HTMLImageElement>(*node))
return true;
if (node->hasTagName(appletTag) || node->hasTagName(embedTag) || node->hasTagName(objectTag))
return true;
if (RefPtr input = dynamicDowncast<HTMLInputElement>(*node))
return input->isImageButton();
return false;
}
bool AccessibilityNodeObject::isSecureField() const
{
RefPtr input = dynamicDowncast<HTMLInputElement>(node());
if (!input || ariaRoleAttribute() != AccessibilityRole::Unknown)
return false;
return input->isSecureField();
}
bool AccessibilityNodeObject::isInputImage() const
{
if (roleValue() != AccessibilityRole::Button)
return false;
RefPtr input = dynamicDowncast<HTMLInputElement>(node());
return input && input->isImageButton();
}
bool AccessibilityNodeObject::isEnabled() const
{
// ARIA says that the disabled status applies to the current element and all descendant elements.
for (AccessibilityObject* object = const_cast<AccessibilityNodeObject*>(this); object; object = object->parentObject()) {
const AtomString& disabledStatus = object->getAttribute(aria_disabledAttr);
if (equalLettersIgnoringASCIICase(disabledStatus, "true"_s))
return false;
if (equalLettersIgnoringASCIICase(disabledStatus, "false"_s))
break;
}
if (roleValue() == AccessibilityRole::HorizontalRule)
return false;
RefPtr element = dynamicDowncast<Element>(node());
return !element || !element->isDisabledFormControl();
}
bool AccessibilityNodeObject::isIndeterminate() const
{
if (supportsCheckedState())
return checkboxOrRadioValue() == AccessibilityButtonState::Mixed;
// We handle this for native <progress> elements in AccessibilityProgressIndicator::isIndeterminate.
if (ariaRoleAttribute() == AccessibilityRole::ProgressIndicator)
return !hasARIAValueNow();
return false;
}
bool AccessibilityNodeObject::isPressed() const
{
if (!isButton())
return false;
Node* node = this->node();
if (!node)
return false;
// If this is an toggle button, check the aria-pressed attribute rather than node()->active()
if (isToggleButton())
return equalLettersIgnoringASCIICase(getAttribute(aria_pressedAttr), "true"_s);
RefPtr element = dynamicDowncast<Element>(*node);
return element && element->active();
}
bool AccessibilityNodeObject::isChecked() const
{
Node* node = this->node();
if (!node)
return false;
// First test for native checkedness semantics
if (RefPtr input = dynamicDowncast<HTMLInputElement>(*node))
return input->matchesCheckedPseudoClass();
// Else, if this is an ARIA checkbox or radio, respect the aria-checked attribute
bool validRole = false;
switch (ariaRoleAttribute()) {
case AccessibilityRole::RadioButton:
case AccessibilityRole::Checkbox:
case AccessibilityRole::MenuItem:
case AccessibilityRole::MenuItemCheckbox:
case AccessibilityRole::MenuItemRadio:
case AccessibilityRole::Switch:
case AccessibilityRole::TreeItem:
validRole = true;
break;
default:
break;
}
if (validRole && equalLettersIgnoringASCIICase(getAttribute(aria_checkedAttr), "true"_s))
return true;
return false;
}
bool AccessibilityNodeObject::isHovered() const
{
RefPtr element = dynamicDowncast<Element>(node());
return element && element->hovered();
}
bool AccessibilityNodeObject::isMultiSelectable() const
{
const AtomString& ariaMultiSelectable = getAttribute(aria_multiselectableAttr);
if (equalLettersIgnoringASCIICase(ariaMultiSelectable, "true"_s))
return true;
if (equalLettersIgnoringASCIICase(ariaMultiSelectable, "false"_s))
return false;
RefPtr select = dynamicDowncast<HTMLSelectElement>(node());
return select && select->multiple();
}
bool AccessibilityNodeObject::isRequired() const
{
RefPtr formControlElement = dynamicDowncast<HTMLFormControlElement>(node());
if (formControlElement && formControlElement->isRequired())
return true;
const AtomString& requiredValue = getAttribute(aria_requiredAttr);
if (equalLettersIgnoringASCIICase(requiredValue, "true"_s))
return true;
if (equalLettersIgnoringASCIICase(requiredValue, "false"_s))
return false;
return false;
}
String AccessibilityNodeObject::accessKey() const
{
auto* element = this->element();
return element ? element->attributeWithoutSynchronization(accesskeyAttr) : String();
}
bool AccessibilityNodeObject::supportsDropping() const
{
return determineDropEffects().size();
}
bool AccessibilityNodeObject::supportsDragging() const
{
const AtomString& grabbed = getAttribute(aria_grabbedAttr);
return equalLettersIgnoringASCIICase(grabbed, "true"_s) || equalLettersIgnoringASCIICase(grabbed, "false"_s) || hasAttribute(draggableAttr);
}
bool AccessibilityNodeObject::isGrabbed()
{
#if ENABLE(DRAG_SUPPORT)
if (mainFrame() && mainFrame()->eventHandler().draggingElement() == element())
return true;
#endif
return elementAttributeValue(aria_grabbedAttr);
}
Vector<String> AccessibilityNodeObject::determineDropEffects() const
{
// Order is aria-dropeffect, dropzone, webkitdropzone
const AtomString& dropEffects = getAttribute(aria_dropeffectAttr);
if (!dropEffects.isEmpty())
return makeStringByReplacingAll(dropEffects.string(), '\n', ' ').split(' ');
auto dropzone = getAttribute(dropzoneAttr);
if (!dropzone.isEmpty())
return Vector<String> { dropzone };
auto webkitdropzone = getAttribute(webkitdropzoneAttr);
if (!webkitdropzone.isEmpty())
return Vector<String> { webkitdropzone };
return { };
}
bool AccessibilityNodeObject::supportsARIAOwns() const
{
return !getAttribute(aria_ownsAttr).isEmpty();
}
bool AccessibilityNodeObject::supportsRequiredAttribute() const
{
switch (roleValue()) {
case AccessibilityRole::Button:
return isFileUploadButton();
case AccessibilityRole::Cell:
case AccessibilityRole::ColumnHeader:
case AccessibilityRole::Checkbox:
case AccessibilityRole::ComboBox:
case AccessibilityRole::Grid:
case AccessibilityRole::GridCell:
case AccessibilityRole::Incrementor:
case AccessibilityRole::ListBox:
case AccessibilityRole::PopUpButton:
case AccessibilityRole::RadioButton:
case AccessibilityRole::RadioGroup:
case AccessibilityRole::RowHeader:
case AccessibilityRole::Slider:
case AccessibilityRole::SpinButton:
case AccessibilityRole::Switch:
case AccessibilityRole::TableHeaderContainer:
case AccessibilityRole::TextArea:
case AccessibilityRole::TextField:
case AccessibilityRole::ToggleButton:
return true;
default:
return false;
}
}
AXCoreObject::AccessibilityChildrenVector AccessibilityNodeObject::radioButtonGroup() const
{
AccessibilityChildrenVector result;
if (auto* input = dynamicDowncast<HTMLInputElement>(node())) {
auto radioButtonGroup = input->radioButtonGroup();
result.reserveInitialCapacity(radioButtonGroup.size());
WeakPtr cache = axObjectCache();
for (auto& radioSibling : radioButtonGroup) {
if (!cache)
break;
if (auto* object = cache->getOrCreate(radioSibling.ptr()))
result.append(object);
}
}
return result;
}
unsigned AccessibilityNodeObject::headingLevel() const
{
// headings can be in block flow and non-block flow
Node* node = this->node();
if (!node)
return 0;
if (isHeading()) {
if (auto level = getIntegralAttribute(aria_levelAttr); level > 0)
return level;
}
if (node->hasTagName(h1Tag))
return 1;