| /* |
| * 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 "AXObjectCache.h" |
| #include "AccessibilityImageMapLink.h" |
| #include "AccessibilityList.h" |
| #include "AccessibilityListBox.h" |
| #include "AccessibilitySpinButton.h" |
| #include "AccessibilityTable.h" |
| #include "Editing.h" |
| #include "ElementIterator.h" |
| #include "EventNames.h" |
| #include "FloatRect.h" |
| #include "Frame.h" |
| #include "FrameLoader.h" |
| #include "FrameSelection.h" |
| #include "FrameView.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 "HTMLParserIdioms.h" |
| #include "HTMLSelectElement.h" |
| #include "HTMLTextAreaElement.h" |
| #include "HTMLTextFormControlElement.h" |
| #include "LabelableElement.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 "Text.h" |
| #include "TextControlInnerElements.h" |
| #include "UserGestureIndicator.h" |
| #include "VisibleUnits.h" |
| #include "Widget.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, Node* labelledbyNode = nullptr); |
| |
| AccessibilityNodeObject::AccessibilityNodeObject(Node* node) |
| : AccessibilityObject() |
| , m_node(node) |
| { |
| } |
| |
| AccessibilityNodeObject::~AccessibilityNodeObject() |
| { |
| ASSERT(isDetached()); |
| } |
| |
| void AccessibilityNodeObject::init() |
| { |
| #ifndef NDEBUG |
| ASSERT(!m_initialized); |
| m_initialized = true; |
| #endif |
| m_role = determineAccessibilityRole(); |
| } |
| |
| Ref<AccessibilityNodeObject> AccessibilityNodeObject::create(Node* node) |
| { |
| return adoptRef(*new AccessibilityNodeObject(node)); |
| } |
| |
| void AccessibilityNodeObject::detach(AccessibilityDetachmentType detachmentType, AXObjectCache* cache) |
| { |
| // AccessibilityObject calls clearChildren. |
| AccessibilityObject::detach(detachmentType, cache); |
| m_node = nullptr; |
| } |
| |
| void AccessibilityNodeObject::childrenChanged() |
| { |
| // This method is meant as a quick way of marking a portion of the accessibility tree dirty. |
| if (!node() && !renderer()) |
| return; |
| |
| AXObjectCache* cache = axObjectCache(); |
| if (!cache) |
| return; |
| cache->postNotification(this, document(), AXObjectCache::AXChildrenChanged); |
| |
| // Should make the sub tree dirty so that everything below will be updated correctly. |
| this->setNeedsToUpdateSubtree(); |
| bool shouldStopUpdatingParent = false; |
| |
| // Go up the accessibility parent chain, but only if the element already exists. This method is |
| // called during render layouts, minimal work should be done. |
| // If AX elements are created now, they could interrogate the render tree while it's in a funky state. |
| // At the same time, process ARIA live region changes. |
| for (AccessibilityObject* parent = this; parent; parent = parent->parentObjectIfExists()) { |
| if (!shouldStopUpdatingParent) |
| parent->setNeedsToUpdateChildren(); |
| |
| |
| // These notifications always need to be sent because screenreaders are reliant on them to perform. |
| // In other words, they need to be sent even when the screen reader has not accessed this live region since the last update. |
| |
| // If this element supports ARIA live regions, then notify the AT of changes. |
| // Sometimes this function can be called many times within a short period of time, leading to posting too many AXLiveRegionChanged |
| // notifications. To fix this, we used a timer to make sure we only post one notification for the children changes within a pre-defined |
| // time interval. |
| if (parent->supportsLiveRegion()) |
| cache->postLiveRegionChangeNotification(parent); |
| |
| // If this element is an ARIA text control, notify the AT of changes. |
| if (parent->isNonNativeTextControl()) { |
| cache->postNotification(parent, parent->document(), AXObjectCache::AXValueChanged); |
| |
| // Do not let the parent that's above the editable ancestor update its children |
| // since we already notify the AT of changes. |
| shouldStopUpdatingParent = true; |
| } |
| } |
| } |
| |
| void AccessibilityNodeObject::updateAccessibilityRole() |
| { |
| bool ignoredStatus = accessibilityIsIgnored(); |
| m_role = determineAccessibilityRole(); |
| |
| // The AX hierarchy only needs to be updated if the ignored status of an element has changed. |
| if (ignoredStatus != accessibilityIsIgnored()) |
| childrenChanged(); |
| } |
| |
| AccessibilityObject* AccessibilityNodeObject::firstChild() const |
| { |
| if (!node()) |
| return nullptr; |
| |
| Node* firstChild = node()->firstChild(); |
| |
| if (!firstChild) |
| return nullptr; |
| |
| auto objectCache = axObjectCache(); |
| return objectCache ? objectCache->getOrCreate(firstChild) : nullptr; |
| } |
| |
| 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::parentObject() const |
| { |
| if (!node()) |
| return nullptr; |
| |
| Node* parentObj = node()->parentNode(); |
| if (!parentObj) |
| return nullptr; |
| |
| if (AXObjectCache* cache = axObjectCache()) |
| return cache->getOrCreate(parentObj); |
| |
| return nullptr; |
| } |
| |
| LayoutRect AccessibilityNodeObject::elementRect() const |
| { |
| return boundingBoxRect(); |
| } |
| |
| LayoutRect AccessibilityNodeObject::boundingBoxRect() const |
| { |
| // AccessibilityNodeObjects have no mechanism yet to return a size or position. |
| // For now, let's return the position of the ancestor that does have a position, |
| // and make it the width of that parent, and about the height of a line of text, so that it's clear the object is a child of the parent. |
| |
| LayoutRect boundingBox; |
| |
| for (AccessibilityObject* positionProvider = parentObject(); positionProvider; positionProvider = positionProvider->parentObject()) { |
| if (positionProvider->isAccessibilityRenderObject()) { |
| LayoutRect parentRect = positionProvider->elementRect(); |
| boundingBox.setSize(LayoutSize(parentRect.width(), LayoutUnit(std::min(10.0f, parentRect.height().toFloat())))); |
| boundingBox.setLocation(parentRect.location()); |
| break; |
| } |
| } |
| |
| return boundingBox; |
| } |
| |
| void AccessibilityNodeObject::setNode(Node* node) |
| { |
| m_node = node; |
| } |
| |
| Document* AccessibilityNodeObject::document() const |
| { |
| if (!node()) |
| return nullptr; |
| return &node()->document(); |
| } |
| |
| AccessibilityRole AccessibilityNodeObject::determineAccessibilityRole() |
| { |
| if (!node()) |
| return AccessibilityRole::Unknown; |
| |
| if ((m_ariaRole = determineAriaRoleAttribute()) != AccessibilityRole::Unknown) |
| return m_ariaRole; |
| |
| if (node()->isLink()) |
| return AccessibilityRole::WebCoreLink; |
| if (node()->isTextNode()) |
| return AccessibilityRole::StaticText; |
| if (node()->hasTagName(buttonTag)) |
| return buttonRoleType(); |
| if (is<HTMLInputElement>(*node())) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node()); |
| if (input.isCheckbox()) |
| return AccessibilityRole::CheckBox; |
| if (input.isRadioButton()) |
| return AccessibilityRole::RadioButton; |
| if (input.isTextButton()) |
| return buttonRoleType(); |
| if (input.isRangeControl()) |
| return AccessibilityRole::Slider; |
| if (input.isInputTypeHidden()) |
| return AccessibilityRole::Ignored; |
| if (input.isSearchField()) |
| return AccessibilityRole::SearchField; |
| #if ENABLE(INPUT_TYPE_COLOR) |
| if (input.isColorControl()) |
| return AccessibilityRole::ColorWell; |
| #endif |
| return AccessibilityRole::TextField; |
| } |
| if (node()->hasTagName(selectTag)) { |
| HTMLSelectElement& selectElement = downcast<HTMLSelectElement>(*node()); |
| return selectElement.multiple() ? AccessibilityRole::ListBox : AccessibilityRole::PopUpButton; |
| } |
| if (is<HTMLTextAreaElement>(*node())) |
| return AccessibilityRole::TextArea; |
| if (headingLevel()) |
| return AccessibilityRole::Heading; |
| if (node()->hasTagName(blockquoteTag)) |
| return AccessibilityRole::Blockquote; |
| if (node()->hasTagName(divTag)) |
| return AccessibilityRole::Div; |
| if (node()->hasTagName(pTag)) |
| return AccessibilityRole::Paragraph; |
| if (is<HTMLLabelElement>(*node())) |
| return AccessibilityRole::Label; |
| if (is<Element>(*node()) && downcast<Element>(*node()).isFocusable()) |
| return AccessibilityRole::Group; |
| |
| return AccessibilityRole::Unknown; |
| } |
| |
| 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_haveChildren); |
| |
| if (!m_node) |
| return; |
| |
| m_haveChildren = true; |
| |
| // The only time we add children from the DOM tree to a node with a renderer is when it's a canvas. |
| if (renderer() && !m_node->hasTagName(canvasTag)) |
| return; |
| |
| auto objectCache = axObjectCache(); |
| if (!objectCache) |
| return; |
| |
| for (Node* child = m_node->firstChild(); child; child = child->nextSibling()) |
| addChild(objectCache->getOrCreate(child)); |
| |
| m_subtreeDirty = false; |
| } |
| |
| bool AccessibilityNodeObject::canHaveChildren() const |
| { |
| // 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. |
| if (!node() && !isAccessibilityRenderObject()) |
| return false; |
| |
| // When <noscript> is not being used (its renderer() == 0), ignore its children. |
| if (node() && !renderer() && node()->hasTagName(noscriptTag)) |
| return false; |
| |
| // Elements that should not have children |
| switch (roleValue()) { |
| case AccessibilityRole::Image: |
| case AccessibilityRole::Button: |
| case AccessibilityRole::PopUpButton: |
| 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; |
| case AccessibilityRole::DocumentMath: |
| #if ENABLE(MATHML) |
| return node()->isMathMLElement(); |
| #endif |
| return false; |
| default: |
| return true; |
| } |
| } |
| |
| bool AccessibilityNodeObject::computeAccessibilityIsIgnored() const |
| { |
| #ifndef NDEBUG |
| // Double-check that an AccessibilityObject is never accessed before |
| // it's been initialized. |
| ASSERT(m_initialized); |
| #endif |
| |
| // Handle non-rendered text that is exposed through aria-hidden=false. |
| if (m_node && m_node->isTextNode() && !renderer()) { |
| // Fallback content in iframe nodes should be ignored. |
| if (m_node->parentNode() && m_node->parentNode()->hasTagName(iframeTag) && m_node->parentNode()->renderer()) |
| return true; |
| |
| // Whitespace only text elements should be ignored when they have no renderer. |
| String string = stringValue().stripWhiteSpace().simplifyWhiteSpace(); |
| if (!string.length()) |
| return true; |
| } |
| |
| AccessibilityObjectInclusion decision = defaultObjectInclusion(); |
| if (decision == AccessibilityObjectInclusion::IncludeObject) |
| return false; |
| if (decision == AccessibilityObjectInclusion::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() == AccessibilityRole::Ignored) |
| return true; |
| |
| return m_role == AccessibilityRole::Unknown; |
| } |
| |
| bool AccessibilityNodeObject::canvasHasFallbackContent() const |
| { |
| Node* node = this->node(); |
| if (!is<HTMLCanvasElement>(node)) |
| return false; |
| HTMLCanvasElement& canvasElement = downcast<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 childrenOfType<Element>(canvasElement).first(); |
| } |
| |
| bool AccessibilityNodeObject::isImageButton() const |
| { |
| return isNativeImage() && isButton(); |
| } |
| |
| bool AccessibilityNodeObject::isNativeTextControl() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return false; |
| |
| if (is<HTMLTextAreaElement>(*node)) |
| return true; |
| |
| if (is<HTMLInputElement>(*node)) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node); |
| return input.isText() || input.isNumberField(); |
| } |
| |
| return false; |
| } |
| |
| bool AccessibilityNodeObject::isSearchField() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return false; |
| |
| if (roleValue() == AccessibilityRole::SearchField) |
| return true; |
| |
| if (!is<HTMLInputElement>(*node)) |
| return false; |
| |
| auto& inputElement = downcast<HTMLInputElement>(*node); |
| |
| // 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")) |
| return true; |
| |
| // Check the form action and the name, which will sometimes be "search". |
| auto* form = inputElement.form(); |
| if (form && (form->name().containsIgnoringASCIICase("search") || form->action().containsIgnoringASCIICase("search"))) |
| 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 (is<HTMLInputElement>(*node)) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node); |
| return input.isImageButton(); |
| } |
| |
| return false; |
| } |
| |
| bool AccessibilityNodeObject::isImage() const |
| { |
| return roleValue() == AccessibilityRole::Image; |
| } |
| |
| bool AccessibilityNodeObject::isPasswordField() const |
| { |
| auto* node = this->node(); |
| if (!is<HTMLInputElement>(node)) |
| return false; |
| |
| if (ariaRoleAttribute() != AccessibilityRole::Unknown) |
| return false; |
| |
| return downcast<HTMLInputElement>(*node).isPasswordField(); |
| } |
| |
| AccessibilityObject* AccessibilityNodeObject::passwordFieldOrContainingPasswordField() |
| { |
| Node* node = this->node(); |
| if (!node) |
| return nullptr; |
| |
| if (is<HTMLInputElement>(*node) && downcast<HTMLInputElement>(*node).isPasswordField()) |
| return this; |
| |
| auto* element = node->shadowHost(); |
| if (!is<HTMLInputElement>(element)) |
| return nullptr; |
| |
| if (auto* cache = axObjectCache()) |
| return cache->getOrCreate(element); |
| |
| return nullptr; |
| } |
| |
| bool AccessibilityNodeObject::isInputImage() const |
| { |
| Node* node = this->node(); |
| if (is<HTMLInputElement>(node) && roleValue() == AccessibilityRole::Button) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node); |
| return input.isImageButton(); |
| } |
| |
| return false; |
| } |
| |
| bool AccessibilityNodeObject::isProgressIndicator() const |
| { |
| return roleValue() == AccessibilityRole::ProgressIndicator || roleValue() == AccessibilityRole::Meter; |
| } |
| |
| bool AccessibilityNodeObject::isSlider() const |
| { |
| return roleValue() == AccessibilityRole::Slider; |
| } |
| |
| bool AccessibilityNodeObject::isMenuRelated() const |
| { |
| switch (roleValue()) { |
| case AccessibilityRole::Menu: |
| case AccessibilityRole::MenuBar: |
| case AccessibilityRole::MenuButton: |
| case AccessibilityRole::MenuItem: |
| case AccessibilityRole::MenuItemCheckbox: |
| case AccessibilityRole::MenuItemRadio: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| bool AccessibilityNodeObject::isMenu() const |
| { |
| return roleValue() == AccessibilityRole::Menu; |
| } |
| |
| bool AccessibilityNodeObject::isMenuBar() const |
| { |
| return roleValue() == AccessibilityRole::MenuBar; |
| } |
| |
| bool AccessibilityNodeObject::isMenuButton() const |
| { |
| return roleValue() == AccessibilityRole::MenuButton; |
| } |
| |
| bool AccessibilityNodeObject::isMenuItem() const |
| { |
| switch (roleValue()) { |
| case AccessibilityRole::MenuItem: |
| case AccessibilityRole::MenuItemRadio: |
| case AccessibilityRole::MenuItemCheckbox: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| bool AccessibilityNodeObject::isNativeCheckboxOrRadio() const |
| { |
| Node* node = this->node(); |
| if (!is<HTMLInputElement>(node)) |
| return false; |
| |
| auto& input = downcast<HTMLInputElement>(*node); |
| return input.isCheckbox() || input.isRadioButton(); |
| } |
| |
| 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")) |
| return false; |
| if (equalLettersIgnoringASCIICase(disabledStatus, "false")) |
| break; |
| } |
| |
| if (roleValue() == AccessibilityRole::HorizontalRule) |
| return false; |
| |
| Node* node = this->node(); |
| if (!is<Element>(node)) |
| return true; |
| |
| return !downcast<Element>(*node).isDisabledFormControl(); |
| } |
| |
| bool AccessibilityNodeObject::isIndeterminate() const |
| { |
| return equalLettersIgnoringASCIICase(getAttribute(indeterminateAttr), "true"); |
| } |
| |
| 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"); |
| |
| if (!is<Element>(*node)) |
| return false; |
| return downcast<Element>(*node).active(); |
| } |
| |
| bool AccessibilityNodeObject::isChecked() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return false; |
| |
| // First test for native checkedness semantics |
| if (is<HTMLInputElement>(*node)) |
| return downcast<HTMLInputElement>(*node).shouldAppearChecked(); |
| |
| // 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: |
| validRole = true; |
| break; |
| default: |
| break; |
| } |
| |
| if (validRole && equalLettersIgnoringASCIICase(getAttribute(aria_checkedAttr), "true")) |
| return true; |
| |
| return false; |
| } |
| |
| bool AccessibilityNodeObject::isHovered() const |
| { |
| Node* node = this->node(); |
| return is<Element>(node) && downcast<Element>(*node).hovered(); |
| } |
| |
| bool AccessibilityNodeObject::isMultiSelectable() const |
| { |
| const AtomString& ariaMultiSelectable = getAttribute(aria_multiselectableAttr); |
| if (equalLettersIgnoringASCIICase(ariaMultiSelectable, "true")) |
| return true; |
| if (equalLettersIgnoringASCIICase(ariaMultiSelectable, "false")) |
| return false; |
| |
| return node() && node()->hasTagName(selectTag) && downcast<HTMLSelectElement>(*node()).multiple(); |
| } |
| |
| bool AccessibilityNodeObject::isRequired() const |
| { |
| // Explicit aria-required values should trump native required attributes. |
| const AtomString& requiredValue = getAttribute(aria_requiredAttr); |
| if (equalLettersIgnoringASCIICase(requiredValue, "true")) |
| return true; |
| if (equalLettersIgnoringASCIICase(requiredValue, "false")) |
| return false; |
| |
| Node* n = this->node(); |
| if (is<HTMLFormControlElement>(n)) |
| return downcast<HTMLFormControlElement>(*n).isRequired(); |
| |
| return false; |
| } |
| |
| 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::TableHeaderContainer: |
| case AccessibilityRole::TextArea: |
| case AccessibilityRole::TextField: |
| case AccessibilityRole::ToggleButton: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| int AccessibilityNodeObject::headingLevel() const |
| { |
| // headings can be in block flow and non-block flow |
| Node* node = this->node(); |
| if (!node) |
| return false; |
| |
| if (isHeading()) { |
| int ariaLevel = getAttribute(aria_levelAttr).toInt(); |
| if (ariaLevel > 0) |
| return ariaLevel; |
| } |
| |
| if (node->hasTagName(h1Tag)) |
| return 1; |
| |
| if (node->hasTagName(h2Tag)) |
| return 2; |
| |
| if (node->hasTagName(h3Tag)) |
| return 3; |
| |
| if (node->hasTagName(h4Tag)) |
| return 4; |
| |
| if (node->hasTagName(h5Tag)) |
| return 5; |
| |
| if (node->hasTagName(h6Tag)) |
| return 6; |
| |
| // The implicit value of aria-level is 2 for the heading role. |
| // https://www.w3.org/TR/wai-aria-1.1/#heading |
| if (ariaRoleAttribute() == AccessibilityRole::Heading) |
| return 2; |
| |
| return 0; |
| } |
| |
| String AccessibilityNodeObject::valueDescription() const |
| { |
| if (!isRangeControl()) |
| return String(); |
| |
| return getAttribute(aria_valuetextAttr).string(); |
| } |
| |
| float AccessibilityNodeObject::valueForRange() const |
| { |
| if (is<HTMLInputElement>(node())) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node()); |
| if (input.isRangeControl()) |
| return input.valueAsNumber(); |
| } |
| |
| if (!isRangeControl()) |
| return 0.0f; |
| |
| // In ARIA 1.1, the implicit value for aria-valuenow on a spin button is 0. |
| // For other roles, it is half way between aria-valuemin and aria-valuemax. |
| auto& value = getAttribute(aria_valuenowAttr); |
| if (!value.isEmpty()) |
| return value.toFloat(); |
| |
| return isSpinButton() ? 0 : (minValueForRange() + maxValueForRange()) / 2; |
| } |
| |
| float AccessibilityNodeObject::maxValueForRange() const |
| { |
| if (is<HTMLInputElement>(node())) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node()); |
| if (input.isRangeControl()) |
| return input.maximum(); |
| } |
| |
| if (!isRangeControl()) |
| return 0.0f; |
| |
| auto& value = getAttribute(aria_valuemaxAttr); |
| if (!value.isEmpty()) |
| return value.toFloat(); |
| |
| // In ARIA 1.1, the implicit value for aria-valuemax on a spin button |
| // is that there is no maximum value. For other roles, it is 100. |
| return isSpinButton() ? std::numeric_limits<float>::max() : 100.0f; |
| } |
| |
| float AccessibilityNodeObject::minValueForRange() const |
| { |
| if (is<HTMLInputElement>(node())) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node()); |
| if (input.isRangeControl()) |
| return input.minimum(); |
| } |
| |
| if (!isRangeControl()) |
| return 0.0f; |
| |
| auto& value = getAttribute(aria_valueminAttr); |
| if (!value.isEmpty()) |
| return value.toFloat(); |
| |
| // In ARIA 1.1, the implicit value for aria-valuemin on a spin button |
| // is that there is no minimum value. For other roles, it is 0. |
| return isSpinButton() ? -std::numeric_limits<float>::max() : 0.0f; |
| } |
| |
| float AccessibilityNodeObject::stepValueForRange() const |
| { |
| return getAttribute(stepAttr).toFloat(); |
| } |
| |
| bool AccessibilityNodeObject::isHeading() const |
| { |
| return roleValue() == AccessibilityRole::Heading; |
| } |
| |
| bool AccessibilityNodeObject::isLink() const |
| { |
| return roleValue() == AccessibilityRole::WebCoreLink; |
| } |
| |
| bool AccessibilityNodeObject::isControl() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return false; |
| |
| return is<HTMLFormControlElement>(*node) || AccessibilityObject::isARIAControl(ariaRoleAttribute()) || roleValue() == AccessibilityRole::Button; |
| } |
| |
| bool AccessibilityNodeObject::isFieldset() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return false; |
| |
| return node->hasTagName(fieldsetTag); |
| } |
| |
| bool AccessibilityNodeObject::isGroup() const |
| { |
| AccessibilityRole role = roleValue(); |
| return role == AccessibilityRole::Group || role == AccessibilityRole::TextGroup || role == AccessibilityRole::ApplicationGroup || role == AccessibilityRole::ApplicationTextGroup; |
| } |
| |
| AXCoreObject* AccessibilityNodeObject::selectedRadioButton() |
| { |
| if (!isRadioGroup()) |
| return nullptr; |
| |
| // Find the child radio button that is selected (ie. the intValue == 1). |
| for (const auto& child : children()) { |
| if (child->roleValue() == AccessibilityRole::RadioButton && child->checkboxOrRadioValue() == AccessibilityButtonState::On) |
| return child.get(); |
| } |
| return nullptr; |
| } |
| |
| AXCoreObject* AccessibilityNodeObject::selectedTabItem() |
| { |
| if (!isTabList()) |
| return nullptr; |
| |
| // FIXME: Is this valid? ARIA tab items support aria-selected; not aria-checked. |
| // Find the child tab item that is selected (ie. the intValue == 1). |
| AXCoreObject::AccessibilityChildrenVector tabs; |
| tabChildren(tabs); |
| |
| for (const auto& child : children()) { |
| if (child->isTabItem() && (child->isChecked() || child->isSelected())) |
| return child.get(); |
| } |
| return nullptr; |
| } |
| |
| AccessibilityButtonState AccessibilityNodeObject::checkboxOrRadioValue() const |
| { |
| if (isNativeCheckboxOrRadio()) |
| return isIndeterminate() ? AccessibilityButtonState::Mixed : isChecked() ? AccessibilityButtonState::On : AccessibilityButtonState::Off; |
| |
| return AccessibilityObject::checkboxOrRadioValue(); |
| } |
| |
| Element* AccessibilityNodeObject::anchorElement() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return nullptr; |
| |
| AXObjectCache* cache = axObjectCache(); |
| if (!cache) |
| return nullptr; |
| |
| // search up the DOM tree for an anchor element |
| // NOTE: this assumes that any non-image with an anchor is an HTMLAnchorElement |
| for ( ; node; node = node->parentNode()) { |
| if (is<HTMLAnchorElement>(*node) || (node->renderer() && cache->getOrCreate(node->renderer())->isLink())) |
| return downcast<Element>(node); |
| } |
| |
| return nullptr; |
| } |
| |
| static bool isNodeActionElement(Node* node) |
| { |
| if (is<HTMLInputElement>(*node)) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node); |
| if (!input.isDisabledFormControl() && (input.isRadioButton() || input.isCheckbox() || input.isTextButton() || input.isFileUpload() || input.isImageButton())) |
| return true; |
| } else if (node->hasTagName(buttonTag) || node->hasTagName(selectTag)) |
| return true; |
| |
| return false; |
| } |
| |
| static Element* nativeActionElement(Node* start) |
| { |
| if (!start) |
| return nullptr; |
| |
| // Do a deep-dive to see if any nodes should be used as the action element. |
| // We have to look at Nodes, since this method should only be called on objects that do not have children (like buttons). |
| // It solves the problem when authors put role="button" on a group and leave the actual button inside the group. |
| |
| for (Node* child = start->firstChild(); child; child = child->nextSibling()) { |
| if (isNodeActionElement(child)) |
| return downcast<Element>(child); |
| |
| if (Element* subChild = nativeActionElement(child)) |
| return subChild; |
| } |
| return nullptr; |
| } |
| |
| Element* AccessibilityNodeObject::actionElement() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return nullptr; |
| |
| if (isNodeActionElement(node)) |
| return downcast<Element>(node); |
| |
| if (AccessibilityObject::isARIAInput(ariaRoleAttribute())) |
| return downcast<Element>(node); |
| |
| switch (roleValue()) { |
| case AccessibilityRole::Button: |
| case AccessibilityRole::PopUpButton: |
| case AccessibilityRole::ToggleButton: |
| case AccessibilityRole::Tab: |
| case AccessibilityRole::MenuItem: |
| case AccessibilityRole::MenuItemCheckbox: |
| case AccessibilityRole::MenuItemRadio: |
| case AccessibilityRole::ListItem: |
| // Check if the author is hiding the real control element inside the ARIA element. |
| if (Element* nativeElement = nativeActionElement(node)) |
| return nativeElement; |
| return downcast<Element>(node); |
| default: |
| break; |
| } |
| |
| Element* elt = anchorElement(); |
| if (!elt) |
| elt = mouseButtonListener(); |
| return elt; |
| } |
| |
| Element* AccessibilityNodeObject::mouseButtonListener(MouseButtonListenerResultFilter filter) const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return nullptr; |
| |
| // check if our parent is a mouse button listener |
| // FIXME: Do the continuation search like anchorElement does |
| for (auto& element : elementLineage(is<Element>(*node) ? downcast<Element>(node) : node->parentElement())) { |
| // If we've reached the body and this is not a control element, do not expose press action for this element unless filter is IncludeBodyElement. |
| // It can cause false positives, where every piece of text is labeled as accepting press actions. |
| if (element.hasTagName(bodyTag) && isStaticText() && filter == ExcludeBodyElement) |
| break; |
| |
| if (element.hasEventListeners(eventNames().clickEvent) || element.hasEventListeners(eventNames().mousedownEvent) || element.hasEventListeners(eventNames().mouseupEvent)) |
| return &element; |
| } |
| |
| return nullptr; |
| } |
| |
| bool AccessibilityNodeObject::isDescendantOfBarrenParent() const |
| { |
| if (!m_isIgnoredFromParentData.isNull()) |
| return m_isIgnoredFromParentData.isDescendantOfBarrenParent; |
| |
| for (AccessibilityObject* object = parentObject(); object; object = object->parentObject()) { |
| if (!object->canHaveChildren()) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void AccessibilityNodeObject::alterSliderValue(bool increase) |
| { |
| if (roleValue() != AccessibilityRole::Slider) |
| return; |
| |
| auto element = this->element(); |
| if (!element || element->isDisabledFormControl()) |
| return; |
| |
| if (!getAttribute(stepAttr).isEmpty()) |
| changeValueByStep(increase); |
| else |
| changeValueByPercent(increase ? 5 : -5); |
| } |
| |
| void AccessibilityNodeObject::increment() |
| { |
| UserGestureIndicator gestureIndicator(ProcessingUserGesture, document()); |
| alterSliderValue(true); |
| } |
| |
| void AccessibilityNodeObject::decrement() |
| { |
| UserGestureIndicator gestureIndicator(ProcessingUserGesture, document()); |
| alterSliderValue(false); |
| } |
| |
| void AccessibilityNodeObject::changeValueByStep(bool increase) |
| { |
| float step = stepValueForRange(); |
| float value = valueForRange(); |
| |
| value += increase ? step : -step; |
| |
| setValue(String::numberToStringFixedPrecision(value)); |
| |
| auto objectCache = axObjectCache(); |
| if (objectCache) |
| objectCache->postNotification(node(), AXObjectCache::AXValueChanged); |
| } |
| |
| void AccessibilityNodeObject::changeValueByPercent(float percentChange) |
| { |
| float range = maxValueForRange() - minValueForRange(); |
| float step = range * (percentChange / 100); |
| float value = valueForRange(); |
| |
| // Make sure the specified percent will cause a change of one integer step or larger. |
| if (std::abs(step) < 1) |
| step = std::abs(percentChange) * (1 / percentChange); |
| |
| value += step; |
| setValue(String::numberToStringFixedPrecision(value)); |
| |
| auto objectCache = axObjectCache(); |
| if (objectCache) |
| objectCache->postNotification(node(), AXObjectCache::AXValueChanged); |
| } |
| |
| bool AccessibilityNodeObject::isGenericFocusableElement() const |
| { |
| if (!canSetFocusAttribute()) |
| return false; |
| |
| // If it's a control, it's not generic. |
| if (isControl()) |
| return false; |
| |
| AccessibilityRole role = roleValue(); |
| if (role == AccessibilityRole::Video || role == AccessibilityRole::Audio) |
| return false; |
| |
| // If it has an aria role, it's not generic. |
| if (m_ariaRole != AccessibilityRole::Unknown) |
| return false; |
| |
| // If the content editable attribute is set on this element, that's the reason |
| // it's focusable, and existing logic should handle this case already - so it's not a |
| // generic focusable element. |
| |
| if (hasContentEditableAttributeSet()) |
| return false; |
| |
| // The web area and body element are both focusable, but existing logic handles these |
| // cases already, so we don't need to include them here. |
| if (role == AccessibilityRole::WebArea) |
| return false; |
| if (node() && node()->hasTagName(bodyTag)) |
| return false; |
| |
| // An SVG root is focusable by default, but it's probably not interactive, so don't |
| // include it. It can still be made accessible by giving it an ARIA role. |
| if (role == AccessibilityRole::SVGRoot) |
| return false; |
| |
| return true; |
| } |
| |
| HTMLLabelElement* AccessibilityNodeObject::labelForElement(Element* element) const |
| { |
| if (!is<HTMLElement>(*element) || !downcast<HTMLElement>(*element).isLabelable()) |
| return nullptr; |
| |
| const AtomString& id = element->getIdAttribute(); |
| if (!id.isEmpty()) { |
| if (HTMLLabelElement* label = element->treeScope().labelElementForId(id)) |
| return label; |
| } |
| |
| return ancestorsOfType<HTMLLabelElement>(*element).first(); |
| } |
| |
| String AccessibilityNodeObject::ariaAccessibilityDescription() const |
| { |
| String ariaLabeledBy = ariaLabeledByAttribute(); |
| if (!ariaLabeledBy.isEmpty()) |
| return ariaLabeledBy; |
| |
| const AtomString& ariaLabel = getAttribute(aria_labelAttr); |
| if (!ariaLabel.isEmpty()) |
| return ariaLabel; |
| |
| return String(); |
| } |
| |
| static Element* siblingWithAriaRole(Node* node, const char* role) |
| { |
| // FIXME: Either we should add a null check here or change the function to take a reference instead of a pointer. |
| ContainerNode* parent = node->parentNode(); |
| if (!parent) |
| return nullptr; |
| |
| for (auto& sibling : childrenOfType<Element>(*parent)) { |
| // FIXME: Should skip sibling that is the same as the node. |
| if (equalIgnoringASCIICase(sibling.attributeWithoutSynchronization(roleAttr), role)) |
| return &sibling; |
| } |
| |
| return nullptr; |
| } |
| |
| Element* AccessibilityNodeObject::menuElementForMenuButton() const |
| { |
| if (ariaRoleAttribute() != AccessibilityRole::MenuButton) |
| return nullptr; |
| |
| return siblingWithAriaRole(node(), "menu"); |
| } |
| |
| AccessibilityObject* AccessibilityNodeObject::menuForMenuButton() const |
| { |
| if (AXObjectCache* cache = axObjectCache()) |
| return cache->getOrCreate(menuElementForMenuButton()); |
| return nullptr; |
| } |
| |
| Element* AccessibilityNodeObject::menuItemElementForMenu() const |
| { |
| if (ariaRoleAttribute() != AccessibilityRole::Menu) |
| return nullptr; |
| |
| return siblingWithAriaRole(node(), "menuitem"); |
| } |
| |
| AccessibilityObject* AccessibilityNodeObject::menuButtonForMenu() const |
| { |
| AXObjectCache* cache = axObjectCache(); |
| if (!cache) |
| return nullptr; |
| |
| Element* menuItem = menuItemElementForMenu(); |
| |
| if (menuItem) { |
| // ARIA just has generic menu items. AppKit needs to know if this is a top level items like MenuBarButton or MenuBarItem |
| AccessibilityObject* menuItemAX = cache->getOrCreate(menuItem); |
| if (menuItemAX && menuItemAX->isMenuButton()) |
| return menuItemAX; |
| } |
| return nullptr; |
| } |
| |
| AccessibilityObject* AccessibilityNodeObject::captionForFigure() const |
| { |
| if (!isFigureElement()) |
| return nullptr; |
| |
| AXObjectCache* cache = axObjectCache(); |
| if (!cache) |
| return nullptr; |
| |
| Node* node = this->node(); |
| for (Node* child = node->firstChild(); child; child = child->nextSibling()) { |
| if (child->hasTagName(figcaptionTag)) |
| return cache->getOrCreate(child); |
| } |
| return nullptr; |
| } |
| |
| bool AccessibilityNodeObject::usesAltTagForTextComputation() const |
| { |
| return isImage() || isInputImage() || isNativeImage() || isCanvas() || (node() && node()->hasTagName(imgTag)); |
| } |
| |
| bool AccessibilityNodeObject::isLabelable() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return false; |
| |
| return is<HTMLInputElement>(*node) || AccessibilityObject::isARIAInput(ariaRoleAttribute()) || isControl() || isProgressIndicator() || isMeter(); |
| } |
| |
| String AccessibilityNodeObject::textForLabelElement(Element* element) const |
| { |
| String result = String(); |
| if (!is<HTMLLabelElement>(*element)) |
| return result; |
| |
| auto objectCache = axObjectCache(); |
| if (!objectCache) |
| return result; |
| |
| HTMLLabelElement* label = downcast<HTMLLabelElement>(element); |
| // Check to see if there's aria-labelledby attribute on the label element. |
| if (AccessibilityObject* labelObject = objectCache->getOrCreate(label)) |
| result = labelObject->ariaLabeledByAttribute(); |
| |
| return !result.isEmpty() ? result : accessibleNameForNode(label); |
| } |
| |
| void AccessibilityNodeObject::titleElementText(Vector<AccessibilityText>& textOrder) const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return; |
| |
| if (isLabelable()) { |
| if (HTMLLabelElement* label = labelForElement(downcast<Element>(node))) { |
| String innerText = textForLabelElement(label); |
| |
| auto objectCache = axObjectCache(); |
| // Only use the <label> text if there's no ARIA override. |
| if (objectCache && !innerText.isEmpty() && !ariaAccessibilityDescription()) |
| textOrder.append(AccessibilityText(innerText, isMeter() ? AccessibilityTextSource::Alternative : AccessibilityTextSource::LabelByElement, objectCache->getOrCreate(label))); |
| return; |
| } |
| } |
| |
| AccessibilityObject* titleUIElement = this->titleUIElement(); |
| if (titleUIElement) |
| textOrder.append(AccessibilityText(String(), AccessibilityTextSource::LabelByElement, titleUIElement)); |
| } |
| |
| void AccessibilityNodeObject::alternativeText(Vector<AccessibilityText>& textOrder) const |
| { |
| if (isWebArea()) { |
| String webAreaText = alternativeTextForWebArea(); |
| if (!webAreaText.isEmpty()) |
| textOrder.append(AccessibilityText(webAreaText, AccessibilityTextSource::Alternative)); |
| return; |
| } |
| |
| ariaLabeledByText(textOrder); |
| |
| const AtomString& ariaLabel = getAttribute(aria_labelAttr); |
| if (!ariaLabel.isEmpty()) |
| textOrder.append(AccessibilityText(ariaLabel, AccessibilityTextSource::Alternative)); |
| |
| if (usesAltTagForTextComputation()) { |
| if (is<RenderImage>(renderer())) { |
| String renderAltText = downcast<RenderImage>(*renderer()).altText(); |
| |
| // RenderImage will return title as a fallback from altText, but we don't want title here because we consider that in helpText. |
| if (!renderAltText.isEmpty() && renderAltText != getAttribute(titleAttr)) { |
| textOrder.append(AccessibilityText(renderAltText, AccessibilityTextSource::Alternative)); |
| return; |
| } |
| } |
| // Images should use alt as long as the attribute is present, even if empty. |
| // Otherwise, it should fallback to other methods, like the title attribute. |
| const AtomString& alt = getAttribute(altAttr); |
| if (!alt.isEmpty()) |
| textOrder.append(AccessibilityText(alt, AccessibilityTextSource::Alternative)); |
| } |
| |
| Node* node = this->node(); |
| if (!node) |
| return; |
| |
| auto objectCache = axObjectCache(); |
| // The fieldset element derives its alternative text from the first associated legend element if one is available. |
| if (objectCache && is<HTMLFieldSetElement>(*node)) { |
| AccessibilityObject* object = objectCache->getOrCreate(downcast<HTMLFieldSetElement>(*node).legend()); |
| if (object && !object->isHidden()) |
| textOrder.append(AccessibilityText(accessibleNameForNode(object->node()), AccessibilityTextSource::Alternative)); |
| } |
| |
| // The figure element derives its alternative text from the first associated figcaption element if one is available. |
| if (isFigureElement()) { |
| AccessibilityObject* captionForFigure = this->captionForFigure(); |
| if (captionForFigure && !captionForFigure->isHidden()) |
| textOrder.append(AccessibilityText(accessibleNameForNode(captionForFigure->node()), AccessibilityTextSource::Alternative)); |
| } |
| |
| // Tree items missing a label are labeled by all child elements. |
| if (isTreeItem() && ariaLabel.isEmpty() && ariaLabeledByAttribute().isEmpty()) |
| textOrder.append(AccessibilityText(accessibleNameForNode(node), AccessibilityTextSource::Alternative)); |
| |
| #if ENABLE(MATHML) |
| if (node->isMathMLElement()) |
| textOrder.append(AccessibilityText(getAttribute(MathMLNames::alttextAttr), AccessibilityTextSource::Alternative)); |
| #endif |
| } |
| |
| void AccessibilityNodeObject::visibleText(Vector<AccessibilityText>& textOrder) const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return; |
| |
| bool isInputTag = is<HTMLInputElement>(*node); |
| if (isInputTag) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node); |
| if (input.isTextButton()) { |
| textOrder.append(AccessibilityText(input.valueWithDefault(), AccessibilityTextSource::Visible)); |
| return; |
| } |
| } |
| |
| // If this node isn't rendered, there's no inner text we can extract from a select element. |
| if (!isAccessibilityRenderObject() && node->hasTagName(selectTag)) |
| return; |
| |
| bool useTextUnderElement = false; |
| |
| switch (roleValue()) { |
| case AccessibilityRole::PopUpButton: |
| // Native popup buttons should not use their button children's text as a title. That value is retrieved through stringValue(). |
| if (node->hasTagName(selectTag)) |
| break; |
| FALLTHROUGH; |
| case AccessibilityRole::Button: |
| case AccessibilityRole::ToggleButton: |
| case AccessibilityRole::CheckBox: |
| case AccessibilityRole::ListBoxOption: |
| // MacOS does not expect native <li> elements to expose label information, it only expects leaf node elements to do that. |
| #if !PLATFORM(COCOA) |
| case AccessibilityRole::ListItem: |
| #endif |
| case AccessibilityRole::MenuButton: |
| case AccessibilityRole::MenuItem: |
| case AccessibilityRole::MenuItemCheckbox: |
| case AccessibilityRole::MenuItemRadio: |
| case AccessibilityRole::RadioButton: |
| case AccessibilityRole::Switch: |
| case AccessibilityRole::Tab: |
| useTextUnderElement = true; |
| break; |
| default: |
| break; |
| } |
| |
| // If it's focusable but it's not content editable or a known control type, then it will appear to |
| // the user as a single atomic object, so we should use its text as the default title. |
| if (isHeading() || isLink()) |
| useTextUnderElement = true; |
| |
| if (isOutput()) |
| useTextUnderElement = true; |
| |
| if (useTextUnderElement) { |
| AccessibilityTextUnderElementMode mode; |
| |
| // Headings often include links as direct children. Those links need to be included in text under element. |
| if (isHeading()) |
| mode.includeFocusableContent = true; |
| |
| String text = textUnderElement(mode); |
| if (!text.isEmpty()) |
| textOrder.append(AccessibilityText(text, AccessibilityTextSource::Children)); |
| } |
| } |
| |
| void AccessibilityNodeObject::helpText(Vector<AccessibilityText>& textOrder) const |
| { |
| const AtomString& ariaHelp = getAttribute(aria_helpAttr); |
| if (!ariaHelp.isEmpty()) |
| textOrder.append(AccessibilityText(ariaHelp, AccessibilityTextSource::Help)); |
| |
| String describedBy = ariaDescribedByAttribute(); |
| if (!describedBy.isEmpty()) |
| textOrder.append(AccessibilityText(describedBy, AccessibilityTextSource::Summary)); |
| else if (isControl()) { |
| // For controls, use their fieldset parent's described-by text if available. |
| auto matchFunc = [] (const AccessibilityObject& object) { |
| return object.isFieldset() && !object.ariaDescribedByAttribute().isEmpty(); |
| }; |
| if (const auto* parent = Accessibility::findAncestor<AccessibilityObject>(*this, false, WTFMove(matchFunc))) |
| textOrder.append(AccessibilityText(parent->ariaDescribedByAttribute(), AccessibilityTextSource::Summary)); |
| } |
| |
| // Summary attribute used as help text on tables. |
| const AtomString& summary = getAttribute(summaryAttr); |
| if (!summary.isEmpty()) |
| textOrder.append(AccessibilityText(summary, AccessibilityTextSource::Summary)); |
| |
| // The title attribute should be used as help text unless it is already being used as descriptive text. |
| // However, when the title attribute is the only text alternative provided, it may be exposed as the |
| // descriptive text. This is problematic in the case of meters because the HTML spec suggests authors |
| // can expose units through this attribute. Therefore, if the element is a meter, change its source |
| // type to AccessibilityTextSource::Help. |
| const AtomString& title = getAttribute(titleAttr); |
| if (!title.isEmpty()) { |
| if (!isMeter() && !roleIgnoresTitle()) |
| textOrder.append(AccessibilityText(title, AccessibilityTextSource::TitleTag)); |
| else |
| textOrder.append(AccessibilityText(title, AccessibilityTextSource::Help)); |
| } |
| } |
| |
| void AccessibilityNodeObject::accessibilityText(Vector<AccessibilityText>& textOrder) const |
| { |
| titleElementText(textOrder); |
| alternativeText(textOrder); |
| visibleText(textOrder); |
| helpText(textOrder); |
| |
| String placeholder = placeholderValue(); |
| if (!placeholder.isEmpty()) |
| textOrder.append(AccessibilityText(placeholder, AccessibilityTextSource::Placeholder)); |
| } |
| |
| void AccessibilityNodeObject::ariaLabeledByText(Vector<AccessibilityText>& textOrder) const |
| { |
| String ariaLabeledBy = ariaLabeledByAttribute(); |
| if (!ariaLabeledBy.isEmpty()) { |
| auto objectCache = axObjectCache(); |
| if (!objectCache) |
| return; |
| |
| Vector<Element*> elements; |
| ariaLabeledByElements(elements); |
| |
| Vector<RefPtr<AccessibilityObject>> axElements; |
| for (const auto& element : elements) |
| axElements.append(objectCache->getOrCreate(element)); |
| |
| textOrder.append(AccessibilityText(ariaLabeledBy, AccessibilityTextSource::Alternative, WTFMove(axElements))); |
| } |
| } |
| |
| String AccessibilityNodeObject::alternativeTextForWebArea() const |
| { |
| // The WebArea description should follow this order: |
| // aria-label on the <html> |
| // title on the <html> |
| // <title> inside the <head> (of it was set through JS) |
| // name on the <html> |
| // For iframes: |
| // aria-label on the <iframe> |
| // title on the <iframe> |
| // name on the <iframe> |
| |
| Document* document = this->document(); |
| if (!document) |
| return String(); |
| |
| // Check if the HTML element has an aria-label for the webpage. |
| if (Element* documentElement = document->documentElement()) { |
| const AtomString& ariaLabel = documentElement->attributeWithoutSynchronization(aria_labelAttr); |
| if (!ariaLabel.isEmpty()) |
| return ariaLabel; |
| } |
| |
| if (auto* owner = document->ownerElement()) { |
| if (owner->hasTagName(frameTag) || owner->hasTagName(iframeTag)) { |
| const AtomString& title = owner->attributeWithoutSynchronization(titleAttr); |
| if (!title.isEmpty()) |
| return title; |
| } |
| return owner->getNameAttribute(); |
| } |
| |
| String documentTitle = document->title(); |
| if (!documentTitle.isEmpty()) |
| return documentTitle; |
| |
| if (auto* body = document->bodyOrFrameset()) |
| return body->getNameAttribute(); |
| |
| return String(); |
| } |
| |
| String AccessibilityNodeObject::accessibilityDescription() const |
| { |
| // Static text should not have a description, it should only have a stringValue. |
| if (roleValue() == AccessibilityRole::StaticText) |
| return String(); |
| |
| String ariaDescription = ariaAccessibilityDescription(); |
| if (!ariaDescription.isEmpty()) |
| return ariaDescription; |
| |
| if (usesAltTagForTextComputation()) { |
| // Images should use alt as long as the attribute is present, even if empty. |
| // Otherwise, it should fallback to other methods, like the title attribute. |
| const AtomString& alt = getAttribute(altAttr); |
| if (!alt.isNull()) |
| return alt; |
| } |
| |
| #if ENABLE(MATHML) |
| if (is<MathMLElement>(m_node)) |
| return getAttribute(MathMLNames::alttextAttr); |
| #endif |
| |
| // An element's descriptive text is comprised of title() (what's visible on the screen) and accessibilityDescription() (other descriptive text). |
| // Both are used to generate what a screen reader speaks. |
| // If this point is reached (i.e. there's no accessibilityDescription) and there's no title(), we should fallback to using the title attribute. |
| // The title attribute is normally used as help text (because it is a tooltip), but if there is nothing else available, this should be used (according to ARIA). |
| // https://bugs.webkit.org/show_bug.cgi?id=170475: An exception is when the element is semantically unimportant. In those cases, title text should remain as help text. |
| if (title().isEmpty() && !roleIgnoresTitle()) |
| return getAttribute(titleAttr); |
| |
| return String(); |
| } |
| |
| // Returns whether the role was not intended to play a semantically meaningful part of the |
| // accessibility hierarchy. This applies to generic groups like <div>'s with no role value set. |
| bool AccessibilityNodeObject::roleIgnoresTitle() const |
| { |
| if (ariaRoleAttribute() != AccessibilityRole::Unknown) |
| return false; |
| |
| switch (roleValue()) { |
| case AccessibilityRole::Div: |
| case AccessibilityRole::Unknown: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| String AccessibilityNodeObject::helpText() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return String(); |
| |
| const AtomString& ariaHelp = getAttribute(aria_helpAttr); |
| if (!ariaHelp.isEmpty()) |
| return ariaHelp; |
| |
| String describedBy = ariaDescribedByAttribute(); |
| if (!describedBy.isEmpty()) |
| return describedBy; |
| |
| String description = accessibilityDescription(); |
| for (Node* ancestor = node; ancestor; ancestor = ancestor->parentNode()) { |
| if (is<HTMLElement>(*ancestor)) { |
| HTMLElement& element = downcast<HTMLElement>(*ancestor); |
| const AtomString& summary = element.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 AtomString& title = element.getAttribute(titleAttr); |
| if (!title.isEmpty() && description != title) |
| return title; |
| } |
| |
| auto objectCache = axObjectCache(); |
| if (!objectCache) |
| return String(); |
| |
| // 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. |
| if (AccessibilityObject* axObj = objectCache->getOrCreate(ancestor)) { |
| if (!axObj->isGroup() && axObj->roleValue() != AccessibilityRole::Unknown) |
| break; |
| } |
| } |
| |
| return String(); |
| } |
| |
| unsigned AccessibilityNodeObject::hierarchicalLevel() const |
| { |
| Node* node = this->node(); |
| if (!is<Element>(node)) |
| return 0; |
| Element& element = downcast<Element>(*node); |
| const AtomString& ariaLevel = element.attributeWithoutSynchronization(aria_levelAttr); |
| if (!ariaLevel.isEmpty()) |
| return ariaLevel.toInt(); |
| |
| // Only tree item will calculate its level through the DOM currently. |
| if (roleValue() != AccessibilityRole::TreeItem) |
| return 0; |
| |
| // Hierarchy leveling starts at 1, to match the aria-level spec. |
| // We measure tree hierarchy by the number of groups that the item is within. |
| unsigned level = 1; |
| for (AccessibilityObject* parent = parentObject(); parent; parent = parent->parentObject()) { |
| AccessibilityRole parentRole = parent->ariaRoleAttribute(); |
| if (parentRole == AccessibilityRole::ApplicationGroup) |
| level++; |
| else if (parentRole == AccessibilityRole::Tree) |
| break; |
| } |
| |
| return level; |
| } |
| |
| void AccessibilityNodeObject::setIsExpanded(bool expand) |
| { |
| if (is<HTMLDetailsElement>(node())) { |
| auto& details = downcast<HTMLDetailsElement>(*node()); |
| if (expand != details.isOpen()) |
| details.toggleOpen(); |
| } |
| } |
| |
| // When building the textUnderElement for an object, determine whether or not |
| // we should include the inner text of this given descendant object or skip it. |
| static bool shouldUseAccessibilityObjectInnerText(AccessibilityObject* obj, AccessibilityTextUnderElementMode mode) |
| { |
| // Do not use any heuristic if we are explicitly asking to include all the children. |
| if (mode.childrenInclusion == AccessibilityTextUnderElementMode::TextUnderElementModeIncludeAllChildren) |
| return true; |
| |
| // Consider this hypothetical example: |
| // <div tabindex=0> |
| // <h2> |
| // Table of contents |
| // </h2> |
| // <a href="#start">Jump to start of book</a> |
| // <ul> |
| // <li><a href="#1">Chapter 1</a></li> |
| // <li><a href="#1">Chapter 2</a></li> |
| // </ul> |
| // </div> |
| // |
| // The goal is to return a reasonable title for the outer container div, because |
| // it's focusable - but without making its title be the full inner text, which is |
| // quite long. As a heuristic, skip links, controls, and elements that are usually |
| // containers with lots of children. |
| |
| // ARIA states that certain elements are not allowed to expose their children content for name calculation. |
| if (mode.childrenInclusion == AccessibilityTextUnderElementMode::TextUnderElementModeIncludeNameFromContentsChildren |
| && !obj->accessibleNameDerivesFromContent()) |
| return false; |
| |
| if (equalLettersIgnoringASCIICase(obj->getAttribute(aria_hiddenAttr), "true")) |
| return false; |
| |
| // If something doesn't expose any children, then we can always take the inner text content. |
| // This is what we want when someone puts an <a> inside a <button> for example. |
| if (obj->isDescendantOfBarrenParent()) |
| return true; |
| |
| // Skip focusable children, so we don't include the text of links and controls. |
| if (obj->canSetFocusAttribute() && !mode.includeFocusableContent) |
| return false; |
| |
| // Skip big container elements like lists, tables, etc. |
| if (is<AccessibilityList>(*obj)) |
| return false; |
| |
| if (is<AccessibilityTable>(*obj) && downcast<AccessibilityTable>(*obj).isExposableThroughAccessibility()) |
| return false; |
| |
| if (obj->isTree() || obj->isCanvas()) |
| return false; |
| |
| return true; |
| } |
| |
| static bool shouldAddSpaceBeforeAppendingNextElement(StringBuilder& builder, const String& childText) |
| { |
| if (!builder.length() || !childText.length()) |
| return false; |
| |
| // We don't need to add an additional space before or after a line break. |
| return !(isHTMLLineBreak(childText[0]) || isHTMLLineBreak(builder[builder.length() - 1])); |
| } |
| |
| static void appendNameToStringBuilder(StringBuilder& builder, const String& text) |
| { |
| if (shouldAddSpaceBeforeAppendingNextElement(builder, text)) |
| builder.append(' '); |
| builder.append(text); |
| } |
| |
| String AccessibilityNodeObject::textUnderElement(AccessibilityTextUnderElementMode mode) const |
| { |
| Node* node = this->node(); |
| if (is<Text>(node)) |
| return downcast<Text>(*node).wholeText(); |
| |
| bool isAriaVisible = Accessibility::findAncestor<AccessibilityObject>(*this, true, [] (const AccessibilityObject& object) { |
| return equalLettersIgnoringASCIICase(object.getAttribute(aria_hiddenAttr), "false"); |
| }) != nullptr; |
| |
| // The Accname specification states that if the current node is hidden, and not directly |
| // referenced by aria-labelledby or aria-describedby, and is not a host language text |
| // alternative, the empty string should be returned. |
| if (isDOMHidden() && !isAriaVisible && !is<HTMLLabelElement>(node) && (node && !ancestorsOfType<HTMLCanvasElement>(*node).first())) { |
| AccessibilityObject::AccessibilityChildrenVector labelFor; |
| AccessibilityObject::AccessibilityChildrenVector descriptionFor; |
| ariaLabelledByReferencingElements(labelFor); |
| ariaDescribedByReferencingElements(descriptionFor); |
| if (!labelFor.size() && !descriptionFor.size()) |
| return String(); |
| } |
| |
| StringBuilder builder; |
| for (AccessibilityObject* child = firstChild(); child; child = child->nextSibling()) { |
| if (mode.ignoredChildNode && child->node() == mode.ignoredChildNode) |
| continue; |
| |
| bool shouldDeriveNameFromAuthor = (mode.childrenInclusion == AccessibilityTextUnderElementMode::TextUnderElementModeIncludeNameFromContentsChildren && !child->accessibleNameDerivesFromContent()); |
| if (shouldDeriveNameFromAuthor) { |
| appendNameToStringBuilder(builder, accessibleNameForNode(child->node())); |
| continue; |
| } |
| |
| if (!shouldUseAccessibilityObjectInnerText(child, mode)) |
| continue; |
| |
| if (is<AccessibilityNodeObject>(*child)) { |
| // We should ignore the child if it's labeled by this node. |
| // This could happen when this node labels multiple child nodes and we didn't |
| // skip in the above ignoredChildNode check. |
| Vector<Element*> labeledByElements; |
| downcast<AccessibilityNodeObject>(*child).ariaLabeledByElements(labeledByElements); |
| if (labeledByElements.contains(node)) |
| continue; |
| |
| Vector<AccessibilityText> textOrder; |
| downcast<AccessibilityNodeObject>(*child).alternativeText(textOrder); |
| if (textOrder.size() > 0 && textOrder[0].text.length()) { |
| appendNameToStringBuilder(builder, textOrder[0].text); |
| continue; |
| } |
| } |
| |
| String childText = child->textUnderElement(mode); |
| if (childText.length()) |
| appendNameToStringBuilder(builder, childText); |
| } |
| |
| return builder.toString().stripWhiteSpace().simplifyWhiteSpace(isHTMLSpaceButNotLineBreak); |
| } |
| |
| String AccessibilityNodeObject::title() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return String(); |
| |
| bool isInputTag = is<HTMLInputElement>(*node); |
| if (isInputTag) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node); |
| if (input.isTextButton()) |
| return input.valueWithDefault(); |
| } |
| |
| if (isLabelable()) { |
| HTMLLabelElement* label = labelForElement(downcast<Element>(node)); |
| // Use the label text as the title if 1) the title element is NOT an exposed element and 2) there's no ARIA override. |
| if (label && !exposesTitleUIElement() && !ariaAccessibilityDescription().length()) |
| return textForLabelElement(label); |
| } |
| |
| // If this node isn't rendered, there's no inner text we can extract from a select element. |
| if (!isAccessibilityRenderObject() && node->hasTagName(selectTag)) |
| return String(); |
| |
| switch (roleValue()) { |
| case AccessibilityRole::PopUpButton: |
| // Native popup buttons should not use their button children's text as a title. That value is retrieved through stringValue(). |
| if (node->hasTagName(selectTag)) |
| return String(); |
| FALLTHROUGH; |
| case AccessibilityRole::Button: |
| case AccessibilityRole::ToggleButton: |
| case AccessibilityRole::CheckBox: |
| case AccessibilityRole::ListBoxOption: |
| case AccessibilityRole::ListItem: |
| case AccessibilityRole::MenuButton: |
| case AccessibilityRole::MenuItem: |
| case AccessibilityRole::MenuItemCheckbox: |
| case AccessibilityRole::MenuItemRadio: |
| case AccessibilityRole::RadioButton: |
| case AccessibilityRole::Switch: |
| case AccessibilityRole::Tab: |
| return textUnderElement(); |
| // SVGRoots should not use the text under itself as a title. That could include the text of objects like <text>. |
| case AccessibilityRole::SVGRoot: |
| return String(); |
| default: |
| break; |
| } |
| |
| if (isLink()) |
| return textUnderElement(); |
| if (isHeading()) |
| return textUnderElement(AccessibilityTextUnderElementMode(AccessibilityTextUnderElementMode::TextUnderElementModeSkipIgnoredChildren, true)); |
| |
| return String(); |
| } |
| |
| String AccessibilityNodeObject::text() const |
| { |
| // If this is a user defined static text, use the accessible name computation. |
| if (isARIAStaticText()) { |
| Vector<AccessibilityText> textOrder; |
| alternativeText(textOrder); |
| if (textOrder.size() > 0 && textOrder[0].text.length()) |
| return textOrder[0].text; |
| } |
| |
| if (!isTextControl()) |
| return String(); |
| |
| Node* node = this->node(); |
| if (!node) |
| return String(); |
| |
| if (isNativeTextControl() && is<HTMLTextFormControlElement>(*node)) |
| return downcast<HTMLTextFormControlElement>(*node).value(); |
| |
| if (!node->isElementNode()) |
| return String(); |
| |
| return downcast<Element>(node)->innerText(); |
| } |
| |
| String AccessibilityNodeObject::stringValue() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return String(); |
| |
| if (isARIAStaticText()) { |
| String staticText = text(); |
| if (!staticText.length()) |
| staticText = textUnderElement(); |
| return staticText; |
| } |
| |
| if (node->isTextNode()) |
| return textUnderElement(); |
| |
| if (node->hasTagName(selectTag)) { |
| HTMLSelectElement& selectElement = downcast<HTMLSelectElement>(*node); |
| int selectedIndex = selectElement.selectedIndex(); |
| const Vector<HTMLElement*>& listItems = selectElement.listItems(); |
| if (selectedIndex >= 0 && static_cast<size_t>(selectedIndex) < listItems.size()) { |
| const AtomString& overriddenDescription = listItems[selectedIndex]->attributeWithoutSynchronization(aria_labelAttr); |
| if (!overriddenDescription.isNull()) |
| return overriddenDescription; |
| } |
| if (!selectElement.multiple()) |
| return selectElement.value(); |
| return String(); |
| } |
| |
| if (isTextControl()) |
| return text(); |
| |
| // 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(); |
| } |
| |
| void AccessibilityNodeObject::colorValue(int& r, int& g, int& b) const |
| { |
| r = 0; |
| g = 0; |
| b = 0; |
| |
| #if ENABLE(INPUT_TYPE_COLOR) |
| if (!isColorWell()) |
| return; |
| |
| if (!is<HTMLInputElement>(node())) |
| return; |
| |
| auto color = downcast<HTMLInputElement>(*node()).valueAsColor(); |
| r = color.red(); |
| g = color.green(); |
| b = color.blue(); |
| #endif |
| } |
| |
| // This function implements the ARIA accessible name as described by the Mozilla |
| // ARIA Implementer's Guide. |
| static String accessibleNameForNode(Node* node, Node* labelledbyNode) |
| { |
| ASSERT(node); |
| if (!is<Element>(node)) |
| return String(); |
| |
| Element& element = downcast<Element>(*node); |
| const AtomString& ariaLabel = element.attributeWithoutSynchronization(aria_labelAttr); |
| if (!ariaLabel.isEmpty()) |
| return ariaLabel; |
| |
| const AtomString& alt = element.attributeWithoutSynchronization(altAttr); |
| if (!alt.isEmpty()) |
| return alt; |
| |
| // If the node can be turned into an AX object, we can use standard name computation rules. |
| // If however, the node cannot (because there's no renderer e.g.) fallback to using the basic text underneath. |
| AccessibilityObject* axObject = node->document().axObjectCache()->getOrCreate(node); |
| if (axObject) { |
| String valueDescription = axObject->valueDescription(); |
| if (!valueDescription.isEmpty()) |
| return valueDescription; |
| |
| // The Accname specification states that if the name is being calculated for a combobox |
| // or listbox inside a labeling element, return the text alternative of the chosen option. |
| AccessibilityObject::AccessibilityChildrenVector children; |
| if (axObject->isListBox()) |
| axObject->selectedChildren(children); |
| else if (axObject->isComboBox()) { |
| for (const auto& child : axObject->children()) { |
| if (child->isListBox()) { |
| child->selectedChildren(children); |
| break; |
| } |
| } |
| } |
| |
| StringBuilder builder; |
| String childText; |
| for (const auto& child : children) |
| appendNameToStringBuilder(builder, accessibleNameForNode(child->node())); |
| |
| childText = builder.toString(); |
| if (!childText.isEmpty()) |
| return childText; |
| } |
| |
| if (is<HTMLInputElement>(*node)) |
| return downcast<HTMLInputElement>(*node).value(); |
| |
| String text; |
| if (axObject) { |
| if (axObject->accessibleNameDerivesFromContent()) |
| text = axObject->textUnderElement(AccessibilityTextUnderElementMode(AccessibilityTextUnderElementMode::TextUnderElementModeIncludeNameFromContentsChildren, true, labelledbyNode)); |
| } else |
| text = element.innerText().simplifyWhiteSpace(); |
| |
| if (!text.isEmpty()) |
| return text; |
| |
| const AtomString& title = element.attributeWithoutSynchronization(titleAttr); |
| if (!title.isEmpty()) |
| return title; |
| |
| return String(); |
| } |
| |
| String AccessibilityNodeObject::accessibilityDescriptionForChildren() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return String(); |
| |
| AXObjectCache* cache = axObjectCache(); |
| if (!cache) |
| return String(); |
| |
| StringBuilder builder; |
| for (Node* child = node->firstChild(); child; child = child->nextSibling()) { |
| if (!is<Element>(child)) |
| continue; |
| |
| if (AccessibilityObject* axObject = cache->getOrCreate(child)) { |
| String description = axObject->ariaLabeledByAttribute(); |
| if (description.isEmpty()) |
| description = accessibleNameForNode(child); |
| appendNameToStringBuilder(builder, description); |
| } |
| } |
| |
| return builder.toString(); |
| } |
| |
| String AccessibilityNodeObject::accessibilityDescriptionForElements(Vector<Element*> &elements) const |
| { |
| StringBuilder builder; |
| unsigned size = elements.size(); |
| for (unsigned i = 0; i < size; ++i) |
| appendNameToStringBuilder(builder, accessibleNameForNode(elements[i], node())); |
| return builder.toString(); |
| } |
| |
| String AccessibilityNodeObject::ariaDescribedByAttribute() const |
| { |
| Vector<Element*> elements; |
| elementsFromAttribute(elements, aria_describedbyAttr); |
| |
| return accessibilityDescriptionForElements(elements); |
| } |
| |
| void AccessibilityNodeObject::ariaLabeledByElements(Vector<Element*>& elements) const |
| { |
| elementsFromAttribute(elements, aria_labelledbyAttr); |
| if (!elements.size()) |
| elementsFromAttribute(elements, aria_labeledbyAttr); |
| } |
| |
| |
| String AccessibilityNodeObject::ariaLabeledByAttribute() const |
| { |
| Vector<Element*> elements; |
| ariaLabeledByElements(elements); |
| |
| return accessibilityDescriptionForElements(elements); |
| } |
| |
| bool AccessibilityNodeObject::hasAttributesRequiredForInclusion() const |
| { |
| if (AccessibilityObject::hasAttributesRequiredForInclusion()) |
| return true; |
| |
| // Avoid calculating the actual description here, which is expensive. |
| // This means there might be more accessible elements in the tree if the labelledBy points to invalid elements, but that shouldn't cause any real problems. |
| if (getAttribute(aria_labelledbyAttr).length() || getAttribute(aria_labeledbyAttr).length() || getAttribute(aria_labelAttr).length()) |
| return true; |
| |
| return false; |
| } |
| |
| bool AccessibilityNodeObject::canSetFocusAttribute() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return false; |
| |
| if (isWebArea()) |
| return true; |
| |
| // NOTE: It would be more accurate to ask the document whether setFocusedElement() would |
| // do anything. For example, setFocusedElement() will do nothing if the current focused |
| // node will not relinquish the focus. |
| if (!is<Element>(node)) |
| return false; |
| |
| Element& element = downcast<Element>(*node); |
| |
| if (element.isDisabledFormControl()) |
| return false; |
| |
| return element.supportsFocus(); |
| } |
| |
| bool AccessibilityNodeObject::canSetValueAttribute() const |
| { |
| Node* node = this->node(); |
| if (!node) |
| return false; |
| |
| // The host-language readonly attribute trumps aria-readonly. |
| if (is<HTMLTextAreaElement>(*node)) |
| return !downcast<HTMLTextAreaElement>(*node).isReadOnly(); |
| if (is<HTMLInputElement>(*node)) { |
| HTMLInputElement& input = downcast<HTMLInputElement>(*node); |
| if (input.isTextField()) |
| return !input.isReadOnly(); |
| } |
| |
| String readOnly = readOnlyValue(); |
| if (!readOnly.isEmpty()) |
| return readOnly == "true" ? false : true; |
| |
| if (isNonNativeTextControl()) |
| return true; |
| |
| if (isMeter()) |
| return false; |
| |
| if (isProgressIndicator() || isSlider() || isScrollbar()) |
| return true; |
| |
| #if USE(ATK) |
| // In ATK, input types which support aria-readonly are treated as having a |
| // settable value if the user can modify the widget's value or its state. |
| if (supportsReadOnly()) |
| return true; |
| |
| if (isRadioButton()) { |
| auto radioGroup = radioGroupAncestor(); |
| return radioGroup ? radioGroup->readOnlyValue() != "true" : true; |
| } |
| #endif |
| |
| if (isWebArea()) { |
| Document* document = this->document(); |
| if (!document) |
| return false; |
| |
| if (HTMLElement* body = document->bodyOrFrameset()) { |
| if (body->hasEditableStyle()) |
| return true; |
| } |
| |
| return document->hasEditableStyle(); |
| } |
| |
| return node->hasEditableStyle(); |
| } |
| |
| AccessibilityRole AccessibilityNodeObject::determineAriaRoleAttribute() const |
| { |
| const AtomString& ariaRole = getAttribute(roleAttr); |
| if (ariaRole.isNull() || ariaRole.isEmpty()) |
| return AccessibilityRole::Unknown; |
| |
| AccessibilityRole role = ariaRoleToWebCoreRole(ariaRole); |
| |
| // ARIA states if an item can get focus, it should not be presentational. |
| if (role == AccessibilityRole::Presentational && canSetFocusAttribute()) |
| return AccessibilityRole::Unknown; |
| |
| if (role == AccessibilityRole::Button) |
| role = buttonRoleType(); |
| |
| if (role == AccessibilityRole::TextArea && !ariaIsMultiline()) |
| role = AccessibilityRole::TextField; |
| |
| role = remapAriaRoleDueToParent(role); |
| |
| // Presentational roles are invalidated by the presence of ARIA attributes. |
| if (role == AccessibilityRole::Presentational && supportsARIAAttributes()) |
| role = AccessibilityRole::Unknown; |
| |
| // The ARIA spec states, "Authors must give each element with role region a brief label that |
| // describes the purpose of the content in the region." The Core AAM states, "Special case: |
| // if the region does not have an accessible name, do not expose the element as a landmark. |
| // Use the native host language role of the element instead." |
| if (role == AccessibilityRole::LandmarkRegion && !hasAttribute(aria_labelAttr) && !hasAttribute(aria_labelledbyAttr)) |
| role = AccessibilityRole::Unknown; |
| |
| if (static_cast<int>(role)) |
| return role; |
| |
| return AccessibilityRole::Unknown; |
| } |
| |
| AccessibilityRole AccessibilityNodeObject::ariaRoleAttribute() const |
| { |
| return m_ariaRole; |
| } |
| |
| AccessibilityRole AccessibilityNodeObject::remapAriaRoleDueToParent(AccessibilityRole role) const |
| { |
| // Some objects change their role based on their parent. |
| // However, asking for the unignoredParent calls accessibilityIsIgnored(), which can trigger a loop. |
| // While inside the call stack of creating an element, we need to avoid accessibilityIsIgnored(). |
| // https://bugs.webkit.org/show_bug.cgi?id=65174 |
| |
| if (role != AccessibilityRole::ListBoxOption && role != AccessibilityRole::MenuItem) |
| return role; |
| |
| for (AccessibilityObject* parent = parentObject(); parent && !parent->accessibilityIsIgnored(); parent = parent->parentObject()) { |
| AccessibilityRole parentAriaRole = parent->ariaRoleAttribute(); |
| |
| // Selects and listboxes both have options as child roles, but they map to different roles within WebCore. |
| if (role == AccessibilityRole::ListBoxOption && parentAriaRole == AccessibilityRole::Menu) |
| return AccessibilityRole::MenuItem; |
| // An aria "menuitem" may map to MenuButton or MenuItem depending on its parent. |
| if (role == AccessibilityRole::MenuItem && parentAriaRole == AccessibilityRole::ApplicationGroup) |
| return AccessibilityRole::MenuButton; |
| |
| // If the parent had a different role, then we don't need to continue searching up the chain. |
| if (parentAriaRole != AccessibilityRole::Unknown) |
| break; |
| } |
| |
| return role; |
| } |
| |
| bool AccessibilityNodeObject::canSetSelectedAttribute() const |
| { |
| // Elements that can be selected |
| switch (roleValue()) { |
| case AccessibilityRole::Cell: |
| case AccessibilityRole::GridCell: |
| case AccessibilityRole::RowHeader: |
| case AccessibilityRole::Row: |
| case AccessibilityRole::TabList: |
| case AccessibilityRole::Tab: |
| case AccessibilityRole::TreeGrid: |
| case AccessibilityRole::TreeItem: |
| case AccessibilityRole::Tree: |
| case AccessibilityRole::MenuItemCheckbox: |
| case AccessibilityRole::MenuItemRadio: |
| case AccessibilityRole::MenuItem: |
| return isEnabled(); |
| default: |
| return false; |
| } |
| } |
| |
| } // namespace WebCore |
