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/*
* Copyright (C) 2015 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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.
*/
#ifndef HTMLSlotElement_h
#define HTMLSlotElement_h
#include "core/CoreExport.h"
#include "core/html/HTMLElement.h"
namespace blink {
class AssignedNodesOptions;
class CORE_EXPORT HTMLSlotElement final : public HTMLElement {
DEFINE_WRAPPERTYPEINFO();
public:
DECLARE_NODE_FACTORY(HTMLSlotElement);
const HeapVector<Member<Node>>& assignedNodes();
const HeapVector<Member<Node>>& getDistributedNodes();
const HeapVector<Member<Node>> getDistributedNodesForBinding();
const HeapVector<Member<Node>> assignedNodesForBinding(
const AssignedNodesOptions&);
Node* firstDistributedNode() const {
DCHECK(supportsDistribution());
return m_distributedNodes.isEmpty() ? nullptr
: m_distributedNodes.front().get();
}
Node* lastDistributedNode() const {
DCHECK(supportsDistribution());
return m_distributedNodes.isEmpty() ? nullptr
: m_distributedNodes.back().get();
}
Node* distributedNodeNextTo(const Node&) const;
Node* distributedNodePreviousTo(const Node&) const;
void appendAssignedNode(Node&);
void resolveDistributedNodes();
void appendDistributedNode(Node&);
void appendDistributedNodesFrom(const HTMLSlotElement& other);
void updateDistributedNodesWithFallback();
void lazyReattachDistributedNodesIfNeeded();
void attachLayoutTree(const AttachContext& = AttachContext()) final;
void detachLayoutTree(const AttachContext& = AttachContext()) final;
void attributeChanged(const AttributeModificationParams&) final;
int tabIndex() const override;
AtomicString name() const;
// This method can be slow because this has to traverse the children of a
// shadow host. This method should be used only when m_assignedNodes is
// dirty. e.g. To detect a slotchange event in DOM mutations.
bool hasAssignedNodesSlow() const;
bool findHostChildWithSameSlotName() const;
void clearDistribution();
void saveAndClearDistribution();
bool supportsDistribution() const { return isInV1ShadowTree(); }
void didSlotChange(SlotChangeType);
void dispatchSlotChangeEvent();
void clearSlotChangeEventEnqueued() { m_slotchangeEventEnqueued = false; }
static AtomicString normalizeSlotName(const AtomicString&);
DECLARE_VIRTUAL_TRACE();
private:
HTMLSlotElement(Document&);
InsertionNotificationRequest insertedInto(ContainerNode*) final;
void removedFrom(ContainerNode*) final;
void willRecalcStyle(StyleRecalcChange) final;
void enqueueSlotChangeEvent();
HeapVector<Member<Node>> m_assignedNodes;
HeapVector<Member<Node>> m_distributedNodes;
HeapVector<Member<Node>> m_oldDistributedNodes;
HeapHashMap<Member<const Node>, size_t> m_distributedIndices;
bool m_slotchangeEventEnqueued = false;
};
} // namespace blink
#endif // HTMLSlotElement_h
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