зеркало из https://github.com/mozilla/gecko-dev.git
110 строки
2.8 KiB
C++
110 строки
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Implementation of DOM Traversal's NodeIterator
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*/
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#ifndef mozilla_dom_NodeIterator_h
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#define mozilla_dom_NodeIterator_h
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#include "nsTraversal.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsStubMutationObserver.h"
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class nsINode;
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namespace mozilla {
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namespace dom {
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class NodeIterator final : public nsStubMutationObserver,
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public nsTraversal
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{
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NodeIterator(nsINode *aRoot,
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uint32_t aWhatToShow,
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NodeFilter* aFilter);
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NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
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NS_DECL_CYCLE_COLLECTION_CLASS(NodeIterator)
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// WebIDL API
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nsINode* Root() const
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{
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return mRoot;
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}
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nsINode* GetReferenceNode() const
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{
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return mPointer.mNode;
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}
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bool PointerBeforeReferenceNode() const
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{
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return mPointer.mBeforeNode;
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}
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uint32_t WhatToShow() const
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{
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return mWhatToShow;
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}
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NodeFilter* GetFilter()
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{
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return mFilter;
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}
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already_AddRefed<nsINode> NextNode(ErrorResult& aResult)
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{
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return NextOrPrevNode(&NodePointer::MoveToNext, aResult);
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}
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already_AddRefed<nsINode> PreviousNode(ErrorResult& aResult)
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{
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return NextOrPrevNode(&NodePointer::MoveToPrevious, aResult);
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}
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void Detach();
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bool WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto, JS::MutableHandle<JSObject*> aReflector);
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private:
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virtual ~NodeIterator();
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struct NodePointer {
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NodePointer()
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: mNode(nullptr)
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, mBeforeNode(false)
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{
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}
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NodePointer(nsINode *aNode, bool aBeforeNode);
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typedef bool (NodePointer::*MoveToMethodType)(nsINode*);
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bool MoveToNext(nsINode *aRoot);
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bool MoveToPrevious(nsINode *aRoot);
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bool MoveForward(nsINode *aRoot, nsINode *aNode);
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void MoveBackward(nsINode *aParent, nsINode *aNode);
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void AdjustAfterRemoval(nsINode *aRoot, nsINode *aContainer, nsIContent *aChild, nsIContent *aPreviousSibling);
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void Clear() { mNode = nullptr; }
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nsINode *mNode;
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bool mBeforeNode;
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};
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// Have to return a strong ref, because the act of testing the node can
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// remove it from the DOM so we're holding the only ref to it.
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already_AddRefed<nsINode>
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NextOrPrevNode(NodePointer::MoveToMethodType aMove, ErrorResult& aResult);
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NodePointer mPointer;
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NodePointer mWorkingPointer;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_NodeIterator_h
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