2007-03-22 10:30:00 -07:00
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is this file as it was released on May 1 2001.
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*
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* The Initial Developer of the Original Code is
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* Jonas Sicking.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Jonas Sicking <sicking@bigfoot.com> (Original Author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Implementation of DOM Traversal's nsIDOMTreeWalker
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*/
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#ifndef nsTreeWalker_h___
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#define nsTreeWalker_h___
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#include "nsIDOMTreeWalker.h"
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#include "nsTraversal.h"
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#include "nsCOMPtr.h"
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#include "nsTArray.h"
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#include "nsCycleCollectionParticipant.h"
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class nsINode;
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class nsIDOMNode;
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class nsIDOMNodeFilter;
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class nsTreeWalker : public nsIDOMTreeWalker, public nsTraversal
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{
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_NSIDOMTREEWALKER
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nsTreeWalker(nsINode *aRoot,
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PRUint32 aWhatToShow,
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nsIDOMNodeFilter *aFilter,
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PRBool aExpandEntityReferences);
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virtual ~nsTreeWalker();
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NS_DECL_CYCLE_COLLECTION_CLASS(nsTreeWalker)
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private:
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nsCOMPtr<nsINode> mCurrentNode;
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/*
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* Array with all child indexes up the tree. This should only be
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* considered a hint and the value could be wrong.
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*/
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nsAutoTArray<PRInt32, 8> mPossibleIndexes;
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/*
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* Position of mCurrentNode in mPossibleIndexes
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*/
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PRInt32 mPossibleIndexesPos;
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/*
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* Finds the first child of aNode and returns it. If a child is
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* found, mCurrentNode is set to that child.
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* @param aNode Node to search for children.
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* @param aReversed Reverses search to find the last child instead
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* of first.
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* @param aIndexPos Position of aNode in mPossibleIndexes.
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* @param _retval Returned node. Null if no child is found
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* @returns Errorcode
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*/
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nsresult FirstChildOf(nsINode* aNode,
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PRBool aReversed,
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PRInt32 aIndexPos,
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nsINode** _retval);
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/*
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* Finds the following sibling of aNode and returns it. If a sibling
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* is found, mCurrentNode is set to that node.
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* @param aNode Node to start search at.
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* @param aReversed Reverses search to find the previous sibling
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* instead of next.
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* @param aIndexPos Position of aNode in mPossibleIndexes.
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* @param _retval Returned node. Null if no sibling is found
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* @returns Errorcode
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*/
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nsresult NextSiblingOf(nsINode* aNode,
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PRBool aReversed,
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PRInt32 aIndexPos,
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nsINode** _retval);
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/*
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* Finds the next node in document order of aNode and returns it.
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* If a node is found, mCurrentNode is set to that node.
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* @param aNode Node to start search at.
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* @param aReversed Reverses search to find the preceding node
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* instead of next.
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* @param aIndexPos Position of aNode in mPossibleIndexes.
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* @param _retval Returned node. Null if no node is found
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* @returns Errorcode
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*/
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nsresult NextInDocumentOrderOf(nsINode* aNode,
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PRBool aReversed,
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PRInt32 aIndexPos,
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nsINode** _retval);
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/*
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* Finds the first child of aNode after child N and returns it. If a
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* child is found, mCurrentNode is set to that child
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* @param aNode Node to search for children
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* @param childNum Child number to start search from. The child with
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* this number is not searched
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* @param aReversed Reverses search to find the last child instead
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* of first
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* @param aIndexPos Position of aNode in mPossibleIndexes
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* @param _retval Returned node. Null if no child is found
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* @returns Errorcode
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*/
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nsresult ChildOf(nsINode* aNode,
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PRInt32 childNum,
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PRBool aReversed,
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PRInt32 aIndexPos,
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nsINode** _retval);
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/*
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* Gets the child index of a node within its parent. Gets a possible index
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* from mPossibleIndexes to gain speed. If the value in mPossibleIndexes
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* isn't correct it'll get the index the usual way.
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* @param aParent in which to get the index
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* @param aChild node to get the index of
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* @param aIndexPos position in mPossibleIndexes that contains the possible.
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* index
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* @returns resulting index
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*/
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PRInt32 IndexOf(nsINode* aParent,
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nsINode* aChild,
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PRInt32 aIndexPos);
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/*
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* Sets the child index at the specified level. It doesn't matter if this
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* fails since mPossibleIndexes should only be considered a hint
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* @param aIndexPos position in mPossibleIndexes to set
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* @param aChildIndex child index at specified position
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*/
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void SetChildIndex(PRInt32 aIndexPos, PRInt32 aChildIndex)
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{
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if (aIndexPos > 0) {
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mPossibleIndexes.EnsureLengthAtLeast(aIndexPos+1);
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mPossibleIndexes.ElementAt(aIndexPos) = aChildIndex;
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}
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}
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};
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#endif
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