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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004, 2007 Apple Inc. All rights reserved.
* Copyright (C) 2014 Samsung Electronics. 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.
*
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_DOM_CHILD_NODE_LIST_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_DOM_CHILD_NODE_LIST_H_
#include "third_party/blink/renderer/core/dom/collection_index_cache.h"
#include "third_party/blink/renderer/core/dom/container_node.h"
#include "third_party/blink/renderer/core/dom/node_list.h"
namespace blink {
class ChildNodeList final : public NodeList {
public:
static ChildNodeList* Create(ContainerNode& root_node) {
return MakeGarbageCollected<ChildNodeList>(root_node);
}
explicit ChildNodeList(ContainerNode& root_node);
~ChildNodeList() override;
// DOM API.
unsigned length() const override {
return collection_index_cache_.NodeCount(*this);
}
Node* item(unsigned index) const override;
// Non-DOM API.
void ChildrenChanged(const ContainerNode::ChildrenChange&);
void InvalidateCache() { collection_index_cache_.Invalidate(); }
ContainerNode& OwnerNode() const { return *parent_; }
ContainerNode& RootNode() const { return OwnerNode(); }
// CollectionIndexCache API.
bool CanTraverseBackward() const { return true; }
Node* TraverseToFirst() const { return RootNode().firstChild(); }
Node* TraverseToLast() const { return RootNode().lastChild(); }
Node* TraverseForwardToOffset(unsigned offset,
Node& current_node,
unsigned& current_offset) const;
Node* TraverseBackwardToOffset(unsigned offset,
Node& current_node,
unsigned& current_offset) const;
void Trace(Visitor*) override;
private:
bool IsChildNodeList() const override { return true; }
Node* VirtualOwnerNode() const override;
Member<ContainerNode> parent_;
mutable CollectionIndexCache<ChildNodeList, Node> collection_index_cache_;
};
DEFINE_TYPE_CASTS(ChildNodeList,
NodeList,
nodeList,
nodeList->IsChildNodeList(),
nodeList.IsChildNodeList());
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_DOM_CHILD_NODE_LIST_H_
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