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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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 "HTMLSlotElement.h"
#include "Event.h"
#include "EventNames.h"
#include "HTMLNames.h"
#include "MutationObserver.h"
#include "ShadowRoot.h"
#include "Text.h"
namespace WebCore {
using namespace HTMLNames;
Ref<HTMLSlotElement> HTMLSlotElement::create(const QualifiedName& tagName, Document& document)
{
return adoptRef(*new HTMLSlotElement(tagName, document));
}
HTMLSlotElement::HTMLSlotElement(const QualifiedName& tagName, Document& document)
: HTMLElement(tagName, document)
{
ASSERT(hasTagName(slotTag));
}
HTMLSlotElement::InsertionNotificationRequest HTMLSlotElement::insertedInto(ContainerNode& insertionPoint)
{
auto insertionResult = HTMLElement::insertedInto(insertionPoint);
ASSERT_UNUSED(insertionResult, insertionResult == InsertionDone);
// This function could be called when this element's shadow root's host or its ancestor is inserted.
// This element is new to the shadow tree (and its tree scope) only if the parent into which this element
// or its ancestor is inserted belongs to the same tree scope as this element's.
if (insertionPoint.isInShadowTree() && isInShadowTree() && &insertionPoint.treeScope() == &treeScope()) {
if (auto shadowRoot = containingShadowRoot())
shadowRoot->addSlotElementByName(attributeWithoutSynchronization(nameAttr), *this);
}
return InsertionDone;
}
void HTMLSlotElement::removedFrom(ContainerNode& insertionPoint)
{
// ContainerNode::removeBetween always sets the removed child's tree scope to Document's but InShadowRoot flag is unset in Node::removedFrom.
// So if InShadowRoot flag is set but this element's tree scope is Document's, this element has just been removed from a shadow root.
if (insertionPoint.isInShadowTree() && isInShadowTree() && &treeScope() == &document()) {
auto* oldShadowRoot = insertionPoint.containingShadowRoot();
ASSERT(oldShadowRoot);
oldShadowRoot->removeSlotElementByName(attributeWithoutSynchronization(nameAttr), *this);
}
HTMLElement::removedFrom(insertionPoint);
}
void HTMLSlotElement::attributeChanged(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& newValue, AttributeModificationReason reason)
{
HTMLElement::attributeChanged(name, oldValue, newValue, reason);
if (isInShadowTree() && name == nameAttr) {
if (auto* shadowRoot = containingShadowRoot()) {
shadowRoot->removeSlotElementByName(oldValue, *this);
shadowRoot->addSlotElementByName(newValue, *this);
}
}
}
const Vector<Node*>* HTMLSlotElement::assignedNodes() const
{
auto* shadowRoot = containingShadowRoot();
if (!shadowRoot)
return nullptr;
return shadowRoot->assignedNodesForSlot(*this);
}
static void flattenAssignedNodes(Vector<Node*>& nodes, const HTMLSlotElement& slot)
{
auto* assignedNodes = slot.assignedNodes();
if (!assignedNodes) {
for (Node* child = slot.firstChild(); child; child = child->nextSibling()) {
if (is<HTMLSlotElement>(*child))
flattenAssignedNodes(nodes, downcast<HTMLSlotElement>(*child));
else if (is<Text>(*child) || is<Element>(*child))
nodes.append(child);
}
return;
}
for (Node* node : *assignedNodes) {
if (is<HTMLSlotElement>(*node))
flattenAssignedNodes(nodes, downcast<HTMLSlotElement>(*node));
else
nodes.append(node);
}
}
Vector<Node*> HTMLSlotElement::assignedNodes(const AssignedNodesOptions& options) const
{
if (options.flatten) {
Vector<Node*> nodes;
flattenAssignedNodes(nodes, *this);
return nodes;
}
auto* assignedNodes = this->assignedNodes();
if (!assignedNodes)
return { };
return *assignedNodes;
}
void HTMLSlotElement::enqueueSlotChangeEvent()
{
// https://dom.spec.whatwg.org/#signal-a-slot-change
if (m_inSignalSlotList)
return;
m_inSignalSlotList = true;
MutationObserver::enqueueSlotChangeEvent(*this);
}
void HTMLSlotElement::dispatchSlotChangeEvent()
{
m_inSignalSlotList = false;
bool bubbles = true;
bool cancelable = false;
Ref<Event> event = Event::create(eventNames().slotchangeEvent, bubbles, cancelable);
event->setTarget(this);
dispatchEvent(event);
}
}
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