249 lines
9.4 KiB
C++
249 lines
9.4 KiB
C++
/*
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* Copyright (C) 2013 The MathJax Consortium. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "MathMLSelectElement.h"
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#if ENABLE(MATHML)
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#include "Event.h"
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#include "EventNames.h"
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#include "HTMLElement.h"
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#include "HTMLNames.h"
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#include "MathMLNames.h"
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#include "RenderMathMLRow.h"
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#include "RenderTreeUpdater.h"
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#include "SVGElement.h"
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#include <wtf/IsoMallocInlines.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(MathMLSelectElement);
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using namespace MathMLNames;
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MathMLSelectElement::MathMLSelectElement(const QualifiedName& tagName, Document& document)
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: MathMLRowElement(tagName, document)
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, m_selectedChild(nullptr)
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{
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}
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Ref<MathMLSelectElement> MathMLSelectElement::create(const QualifiedName& tagName, Document& document)
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{
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return adoptRef(*new MathMLSelectElement(tagName, document));
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}
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RenderPtr<RenderElement> MathMLSelectElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
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{
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return createRenderer<RenderMathMLRow>(*this, WTFMove(style));
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}
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// We recognize the following values for the encoding attribute of the <semantics> element:
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//
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// - "MathML-Presentation", which is mentioned in the MathML 3 recommendation.
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// - "SVG1.1" which is mentioned in the W3C note.
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// http://www.w3.org/Math/Documents/Notes/graphics.xml
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// - Other MIME Content-Types for MathML, SVG and HTML.
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//
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// We exclude "application/mathml+xml" which is ambiguous about whether it is Presentation or Content MathML. Authors must use a more explicit encoding value.
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bool MathMLSelectElement::isMathMLEncoding(const AtomString& value)
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{
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return value == "application/mathml-presentation+xml" || value == "MathML-Presentation";
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}
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bool MathMLSelectElement::isSVGEncoding(const AtomString& value)
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{
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return value == "image/svg+xml" || value == "SVG1.1";
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}
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bool MathMLSelectElement::isHTMLEncoding(const AtomString& value)
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{
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return value == "application/xhtml+xml" || value == "text/html";
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}
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bool MathMLSelectElement::childShouldCreateRenderer(const Node& child) const
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{
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return MathMLElement::childShouldCreateRenderer(child) && m_selectedChild == &child;
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}
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void MathMLSelectElement::finishParsingChildren()
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{
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updateSelectedChild();
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MathMLRowElement::finishParsingChildren();
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}
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void MathMLSelectElement::childrenChanged(const ChildChange& change)
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{
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updateSelectedChild();
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MathMLRowElement::childrenChanged(change);
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}
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void MathMLSelectElement::attributeChanged(const QualifiedName& name, const AtomString& oldValue, const AtomString& newValue, AttributeModificationReason reason)
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{
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if (hasTagName(mactionTag) && (name == MathMLNames::actiontypeAttr || name == MathMLNames::selectionAttr))
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updateSelectedChild();
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MathMLRowElement::attributeChanged(name, oldValue, newValue, reason);
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}
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int MathMLSelectElement::getSelectedActionChildAndIndex(Element*& selectedChild)
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{
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ASSERT(hasTagName(mactionTag));
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// We "round up or down to the closest allowable value" of the selection attribute, as suggested by the MathML specification.
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selectedChild = firstElementChild();
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if (!selectedChild)
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return 1;
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int selection = getIntegralAttribute(MathMLNames::selectionAttr);
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int i;
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for (i = 1; i < selection; i++) {
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auto* nextChild = selectedChild->nextElementSibling();
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if (!nextChild)
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break;
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selectedChild = nextChild;
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}
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return i;
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}
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Element* MathMLSelectElement::getSelectedActionChild()
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{
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ASSERT(hasTagName(mactionTag));
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auto* child = firstElementChild();
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if (!child)
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return child;
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// The value of the actiontype attribute is case-sensitive.
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auto& actiontype = attributeWithoutSynchronization(MathMLNames::actiontypeAttr);
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if (actiontype == "statusline")
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// FIXME: implement user interaction for the "statusline" action type (http://wkbug/124922).
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{ }
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else if (actiontype == "tooltip")
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// FIXME: implement user interaction for the "tooltip" action type (http://wkbug/124921).
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{ }
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else {
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// For the "toggle" action type or any unknown action type, we rely on the value of the selection attribute to determine the visible child.
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getSelectedActionChildAndIndex(child);
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}
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return child;
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}
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Element* MathMLSelectElement::getSelectedSemanticsChild()
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{
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ASSERT(hasTagName(semanticsTag));
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auto* child = firstElementChild();
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if (!child)
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return nullptr;
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if (!is<MathMLElement>(*child) || !downcast<MathMLElement>(*child).isPresentationMathML()) {
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// The first child is not a presentation MathML element. Hence we move to the second child and start searching an annotation child that could be displayed.
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child = child->nextElementSibling();
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} else if (!downcast<MathMLElement>(*child).isSemanticAnnotation()) {
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// The first child is a presentation MathML but not an annotation, so we can just display it.
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return child;
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}
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// Otherwise, the first child is an <annotation> or <annotation-xml> element. This is invalid, but some people use this syntax so we take care of this case too and start the search from this first child.
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for ( ; child; child = child->nextElementSibling()) {
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if (!is<MathMLElement>(*child))
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continue;
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if (child->hasTagName(MathMLNames::annotationTag)) {
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// If the <annotation> element has an src attribute then it is a reference to arbitrary binary data and it is not clear whether we can display it. Hence we just ignore the annotation.
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if (child->hasAttributeWithoutSynchronization(MathMLNames::srcAttr))
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continue;
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// Otherwise, we assume it is a text annotation that can always be displayed and we stop here.
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return child;
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}
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if (child->hasTagName(MathMLNames::annotation_xmlTag)) {
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// If the <annotation-xml> element has an src attribute then it is a reference to arbitrary binary data and it is not clear whether we can display it. Hence we just ignore the annotation.
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if (child->hasAttributeWithoutSynchronization(MathMLNames::srcAttr))
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continue;
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// If the <annotation-xml> element has an encoding attribute describing presentation MathML, SVG or HTML we assume the content can be displayed and we stop here.
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auto& value = child->attributeWithoutSynchronization(MathMLNames::encodingAttr);
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if (isMathMLEncoding(value) || isSVGEncoding(value) || isHTMLEncoding(value))
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return child;
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}
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}
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// We fallback to the first child.
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return firstElementChild();
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}
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void MathMLSelectElement::updateSelectedChild()
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{
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auto* newSelectedChild = hasTagName(mactionTag) ? getSelectedActionChild() : getSelectedSemanticsChild();
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if (m_selectedChild == newSelectedChild)
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return;
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if (m_selectedChild && m_selectedChild->renderer())
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RenderTreeUpdater::tearDownRenderers(*m_selectedChild);
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m_selectedChild = newSelectedChild;
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invalidateStyleForSubtree();
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}
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void MathMLSelectElement::defaultEventHandler(Event& event)
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{
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if (event.type() == eventNames().clickEvent) {
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if (attributeWithoutSynchronization(MathMLNames::actiontypeAttr) == "toggle") {
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toggle();
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event.setDefaultHandled();
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return;
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}
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}
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MathMLRowElement::defaultEventHandler(event);
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}
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bool MathMLSelectElement::willRespondToMouseClickEvents()
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{
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return attributeWithoutSynchronization(MathMLNames::actiontypeAttr) == "toggle" || MathMLRowElement::willRespondToMouseClickEvents();
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}
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void MathMLSelectElement::toggle()
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{
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// Select the successor of the currently selected child
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// or the first child if the currently selected child is the last.
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Element* selectedChild;
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int newSelectedChildIndex = getSelectedActionChildAndIndex(selectedChild) + 1;
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if (!selectedChild || !selectedChild->nextElementSibling())
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newSelectedChildIndex = 1;
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// We update the attribute value of the selection attribute.
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// This will also call MathMLSelectElement::attributeChanged to update the selected child.
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setAttributeWithoutSynchronization(MathMLNames::selectionAttr, AtomString::number(newSelectedChildIndex));
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}
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}
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#endif // ENABLE(MATHML)
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