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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 { return m_assignedNodes; }
const HeapVector<Member<Node>>& getDistributedNodes();
const HeapVector<Member<Node>> assignedNodesForBinding(const AssignedNodesOptions&);
Node* firstDistributedNode() const { return m_distributedNodes.isEmpty() ? nullptr : m_distributedNodes.first().get(); }
Node* lastDistributedNode() const { return m_distributedNodes.isEmpty() ? nullptr : m_distributedNodes.last().get(); }
Node* distributedNodeNextTo(const Node&) const;
Node* distributedNodePreviousTo(const Node&) const;
void appendAssignedNode(Node&);
void willUpdateAssignment();
void appendDistributedNode(Node&);
void appendDistributedNodesFrom(const HTMLSlotElement& other);
void willUpdateDistribution();
void appendFallbackNode(Node&);
void willUpdateFallback();
void didUpdateAssignment();
void updateFallbackNodes();
void updateDistributedNodesWithFallback();
void didUpdateDistribution();
void fireSlotChangeEvent();
void attach(const AttachContext& = AttachContext()) final;
void detach(const AttachContext& = AttachContext()) final;
void attributeChanged(const QualifiedName&, const AtomicString& oldValue, const AtomicString& newValue, AttributeModificationReason = ModifiedDirectly) final;
short tabIndex() const override;
AtomicString name() const;
DECLARE_VIRTUAL_TRACE();
private:
HTMLSlotElement(Document&);
enum AssignmentState {
AssignmentOnGoing,
AssignmentDone,
AssignmentChanged,
AssignmentUnchanged
};
enum DistributionState {
DistributionOnGoing,
DistributionDone,
DistributionChanged,
DistributionUnchanged
};
void clearDistribution();
void childrenChanged(const ChildrenChange&) final;
InsertionNotificationRequest insertedInto(ContainerNode*) final;
void removedFrom(ContainerNode*) final;
void willRecalcStyle(StyleRecalcChange) final;
void dispatchSlotChangeEvent();
bool assignmentChanged();
bool distributionChanged();
bool fallbackChanged();
HeapVector<Member<Node>> m_assignedNodes;
HeapVector<Member<Node>> m_distributedNodes;
HeapVector<Member<Node>> m_fallbackNodes;
HeapHashMap<Member<const Node>, size_t> m_distributedIndices;
HeapVector<Member<Node>> m_oldAssignedNodes;
// TODO(hayato): Remove m_oldDistibutedNodes and make SlotAssignment check the diffirence between old and new distributed nodes for each slot to save the memories.
HeapVector<Member<Node>> m_oldDistributedNodes;
HeapVector<Member<Node>> m_oldFallbackNodes;
DistributionState m_distributionState;
AssignmentState m_assignmentState;
bool m_slotchangeEventAdded;
};
} // namespace blink
#endif // HTMLSlotElement_h