blob: 8844b3399743b7e93f4c3815ae878bde413a174a [file] [log] [blame]
/*
* Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
* Copyright (C) 2018 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "SVGTRefElement.h"
#include "AddEventListenerOptions.h"
#include "ElementRareData.h"
#include "EventListener.h"
#include "EventNames.h"
#include "MutationEvent.h"
#include "RenderSVGInline.h"
#include "RenderSVGInlineText.h"
#include "RenderSVGResource.h"
#include "SVGDocumentExtensions.h"
#include "SVGElementInlines.h"
#include "SVGNames.h"
#include "ScriptDisallowedScope.h"
#include "ShadowRoot.h"
#include "StyleInheritedData.h"
#include "Text.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(SVGTRefElement);
Ref<SVGTRefElement> SVGTRefElement::create(const QualifiedName& tagName, Document& document)
{
Ref<SVGTRefElement> element = adoptRef(*new SVGTRefElement(tagName, document));
element->ensureUserAgentShadowRoot();
return element;
}
class SVGTRefTargetEventListener final : public EventListener {
public:
static Ref<SVGTRefTargetEventListener> create(SVGTRefElement& trefElement)
{
return adoptRef(*new SVGTRefTargetEventListener(trefElement));
}
static const SVGTRefTargetEventListener* cast(const EventListener* listener)
{
return listener->type() == SVGTRefTargetEventListenerType ? static_cast<const SVGTRefTargetEventListener*>(listener) : nullptr;
}
void attach(RefPtr<Element>&& target);
void detach();
bool isAttached() const { return m_target.get(); }
private:
explicit SVGTRefTargetEventListener(SVGTRefElement& trefElement);
void handleEvent(ScriptExecutionContext&, Event&) final;
bool operator==(const EventListener&) const final;
SVGTRefElement& m_trefElement;
RefPtr<Element> m_target;
};
SVGTRefTargetEventListener::SVGTRefTargetEventListener(SVGTRefElement& trefElement)
: EventListener(SVGTRefTargetEventListenerType)
, m_trefElement(trefElement)
, m_target(nullptr)
{
}
void SVGTRefTargetEventListener::attach(RefPtr<Element>&& target)
{
ASSERT(!isAttached());
ASSERT(target.get());
ASSERT(target->isConnected());
target->addEventListener(eventNames().DOMSubtreeModifiedEvent, *this, false);
target->addEventListener(eventNames().DOMNodeRemovedFromDocumentEvent, *this, false);
m_target = WTFMove(target);
}
void SVGTRefTargetEventListener::detach()
{
if (!isAttached())
return;
m_target->removeEventListener(eventNames().DOMSubtreeModifiedEvent, *this, false);
m_target->removeEventListener(eventNames().DOMNodeRemovedFromDocumentEvent, *this, false);
m_target = nullptr;
}
bool SVGTRefTargetEventListener::operator==(const EventListener& listener) const
{
if (const SVGTRefTargetEventListener* targetListener = SVGTRefTargetEventListener::cast(&listener))
return &m_trefElement == &targetListener->m_trefElement;
return false;
}
void SVGTRefTargetEventListener::handleEvent(ScriptExecutionContext&, Event& event)
{
if (!isAttached())
return;
if (event.type() == eventNames().DOMSubtreeModifiedEvent && &m_trefElement != event.target())
m_trefElement.updateReferencedText(m_target.get());
else if (event.type() == eventNames().DOMNodeRemovedFromDocumentEvent)
m_trefElement.detachTarget();
}
inline SVGTRefElement::SVGTRefElement(const QualifiedName& tagName, Document& document)
: SVGTextPositioningElement(tagName, document)
, SVGURIReference(this)
, m_targetListener(SVGTRefTargetEventListener::create(*this))
{
ASSERT(hasTagName(SVGNames::trefTag));
}
SVGTRefElement::~SVGTRefElement()
{
m_targetListener->detach();
}
void SVGTRefElement::updateReferencedText(Element* target)
{
String textContent;
if (target)
textContent = target->textContent();
auto root = userAgentShadowRoot();
ASSERT(root);
ScriptDisallowedScope::EventAllowedScope allowedScope(*root);
if (!root->firstChild())
root->appendChild(Text::create(document(), WTFMove(textContent)));
else {
ASSERT(root->firstChild()->isTextNode());
root->firstChild()->setTextContent(WTFMove(textContent));
}
}
void SVGTRefElement::detachTarget()
{
// Remove active listeners and clear the text content.
m_targetListener->detach();
ASSERT(shadowRoot());
RefPtr container = shadowRoot()->firstChild();
if (container)
container->setTextContent(String { });
if (!isConnected())
return;
// Mark the referenced ID as pending.
auto target = SVGURIReference::targetElementFromIRIString(href(), document());
if (!target.identifier.isEmpty())
document().accessSVGExtensions().addPendingResource(target.identifier, *this);
}
void SVGTRefElement::parseAttribute(const QualifiedName& name, const AtomString& value)
{
SVGTextPositioningElement::parseAttribute(name, value);
SVGURIReference::parseAttribute(name, value);
}
void SVGTRefElement::svgAttributeChanged(const QualifiedName& attrName)
{
if (SVGURIReference::isKnownAttribute(attrName)) {
InstanceInvalidationGuard guard(*this);
buildPendingResource();
updateSVGRendererForElementChange();
return;
}
SVGTextPositioningElement::svgAttributeChanged(attrName);
}
RenderPtr<RenderElement> SVGTRefElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&)
{
return createRenderer<RenderSVGInline>(*this, WTFMove(style));
}
bool SVGTRefElement::childShouldCreateRenderer(const Node& child) const
{
return child.isInShadowTree();
}
bool SVGTRefElement::rendererIsNeeded(const RenderStyle& style)
{
if (parentNode()
&& (parentNode()->hasTagName(SVGNames::aTag)
|| parentNode()->hasTagName(SVGNames::altGlyphTag)
|| parentNode()->hasTagName(SVGNames::textTag)
|| parentNode()->hasTagName(SVGNames::textPathTag)
|| parentNode()->hasTagName(SVGNames::tspanTag)))
return StyledElement::rendererIsNeeded(style);
return false;
}
void SVGTRefElement::clearTarget()
{
m_targetListener->detach();
}
void SVGTRefElement::buildPendingResource()
{
// Remove any existing event listener.
m_targetListener->detach();
// If we're not yet in a document, this function will be called again from insertedIntoAncestor().
if (!isConnected())
return;
auto target = SVGURIReference::targetElementFromIRIString(href(), treeScope());
if (!target.element) {
if (target.identifier.isEmpty())
return;
document().accessSVGExtensions().addPendingResource(target.identifier, *this);
ASSERT(hasPendingResources());
return;
}
// Don't set up event listeners if this is a shadow tree node.
// SVGUseElement::transferEventListenersToShadowTree() handles this task, and addEventListener()
// expects every element instance to have an associated shadow tree element - which is not the
// case when we land here from SVGUseElement::buildShadowTree().
if (!isInShadowTree())
m_targetListener->attach(target.element.copyRef());
updateReferencedText(target.element.get());
}
Node::InsertedIntoAncestorResult SVGTRefElement::insertedIntoAncestor(InsertionType insertionType, ContainerNode& parentOfInsertedTree)
{
SVGElement::insertedIntoAncestor(insertionType, parentOfInsertedTree);
if (insertionType.connectedToDocument)
return InsertedIntoAncestorResult::NeedsPostInsertionCallback;
return InsertedIntoAncestorResult::Done;
}
void SVGTRefElement::didFinishInsertingNode()
{
buildPendingResource();
}
void SVGTRefElement::removedFromAncestor(RemovalType removalType, ContainerNode& oldParentOfRemovedTree)
{
SVGElement::removedFromAncestor(removalType, oldParentOfRemovedTree);
if (removalType.disconnectedFromDocument)
m_targetListener->detach();
}
}