mirror of
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672 lines
23 KiB
C++
672 lines
23 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 Mozilla.org code.
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*
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* The Initial Developer of the Original Code is Mozilla.com.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Boris Zbarsky <bzbarsky@mit.edu> (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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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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#ifndef nsINode_h___
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#define nsINode_h___
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#include "nsIDOMGCParticipant.h"
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#include "nsEvent.h"
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#include "nsPropertyTable.h"
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#include "nsTObserverArray.h"
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#ifdef MOZILLA_INTERNAL_API
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#include "nsINodeInfo.h"
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#include "nsCOMPtr.h"
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#endif
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class nsIContent;
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class nsIDocument;
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class nsIDOMEvent;
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class nsPresContext;
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class nsEventChainPreVisitor;
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class nsEventChainPostVisitor;
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class nsIEventListenerManager;
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class nsIPrincipal;
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class nsIDOMRange;
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class nsVoidArray;
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class nsIMutationObserver;
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// This bit will be set if the node doesn't have nsSlots
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#define NODE_DOESNT_HAVE_SLOTS 0x00000001U
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// This bit will be set if the node has a range list in the range list hash
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#define NODE_HAS_RANGELIST 0x00000002U
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// This bit will be set if the node has a listener manager in the listener
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// manager hash
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#define NODE_HAS_LISTENERMANAGER 0x00000004U
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// Whether this node has had any properties set on it
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#define NODE_HAS_PROPERTIES 0x00000008U
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// Whether this node is anonymous
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// NOTE: Should only be used on nsIContent nodes
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#define NODE_IS_ANONYMOUS 0x00000010U
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// Whether this node may have a frame
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// NOTE: Should only be used on nsIContent nodes
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#define NODE_MAY_HAVE_FRAME 0x00000020U
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// Four bits for the script-type ID
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#define NODE_SCRIPT_TYPE_OFFSET 6
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// Remaining bits are node type specific.
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#define NODE_TYPE_SPECIFIC_BITS_OFFSET 0x0a
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// Useful macro for getting a node given an nsIContent and an nsIDocument
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// Returns the first argument cast to nsINode if it is non-null, otherwise
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// returns the second (which may be null)
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#define NODE_FROM(content_, document_) \
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((content_) ? NS_STATIC_CAST(nsINode*, (content_)) : \
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NS_STATIC_CAST(nsINode*, (document_)))
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// IID for the nsINode interface
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#define NS_INODE_IID \
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{ 0x59693a45, 0x7cb2, 0x41d6, \
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{ 0xaf, 0xe3, 0xa7, 0xc7, 0x6f, 0xe0, 0x54, 0xf0 } }
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// hack to make egcs / gcc 2.95.2 happy
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class nsINode_base : public nsIDOMGCParticipant {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODE_IID)
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};
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/**
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* An internal interface that abstracts some DOMNode-related parts that both
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* nsIContent and nsIDocument share. An instance of this interface has a list
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* of nsIContent children and provides access to them.
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*/
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class nsINode : public nsINode_base {
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public:
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#ifdef MOZILLA_INTERNAL_API
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// If you're using the external API, the only thing you can know about
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// nsINode is that it exists with an IID, if that....
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friend class nsNodeUtils;
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nsINode(nsINodeInfo* aNodeInfo)
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: mNodeInfo(aNodeInfo),
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mParentPtrBits(0),
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mFlagsOrSlots(NODE_DOESNT_HAVE_SLOTS)
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{
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}
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virtual ~nsINode();
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/**
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* Bit-flags to pass (or'ed together) to IsNodeOfType()
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*/
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enum {
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/** nsIContent nodes */
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eCONTENT = 1 << 0,
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/** nsIDocument nodes */
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eDOCUMENT = 1 << 1,
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/** nsIAttribute nodes */
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eATTRIBUTE = 1 << 2,
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/** elements */
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eELEMENT = 1 << 3,
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/** text nodes */
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eTEXT = 1 << 4,
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/** xml processing instructions */
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ePROCESSING_INSTRUCTION = 1 << 5,
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/** comment nodes */
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eCOMMENT = 1 << 6,
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/** html elements */
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eHTML = 1 << 7,
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/** form control elements */
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eHTML_FORM_CONTROL = 1 << 8,
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/** XUL elements */
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eXUL = 1 << 9,
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/** svg elements */
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eSVG = 1 << 10,
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/** document fragments */
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eDOCUMENT_FRAGMENT = 1 << 11,
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/** data nodes (comments, PIs, text). Nodes of this type always
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returns a non-null value for nsIContent::GetText() */
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eDATA_NODE = 1 << 12
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};
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/**
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* API for doing a quick check if a content is of a given
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* type, such as HTML, XUL, Text, ... Use this when you can instead of
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* checking the tag.
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*
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* @param aFlags what types you want to test for (see above)
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* @return whether the content matches ALL flags passed in
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*/
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virtual PRBool IsNodeOfType(PRUint32 aFlags) const = 0;
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/**
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* Get the number of children
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* @return the number of children
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*/
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virtual PRUint32 GetChildCount() const = 0;
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/**
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* Get a child by index
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* @param aIndex the index of the child to get
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* @return the child, or null if index out of bounds
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*/
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virtual nsIContent* GetChildAt(PRUint32 aIndex) const = 0;
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/**
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* Get the index of a child within this content
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* @param aPossibleChild the child to get the index of.
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* @return the index of the child, or -1 if not a child
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*
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* If the return value is not -1, then calling GetChildAt() with that value
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* will return aPossibleChild.
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*/
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virtual PRInt32 IndexOf(nsINode* aPossibleChild) const = 0;
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/**
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* Return the "owner document" of this node. Note that this is not the same
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* as the DOM ownerDocument -- that's null for Document nodes, whereas for a
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* nsIDocument GetOwnerDocument returns the document itself. For nsIContent
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* implementations the two are the same.
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*/
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nsIDocument *GetOwnerDoc() const
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{
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return mNodeInfo->GetDocument();
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}
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/**
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* Returns true if the content has an ancestor that is a document.
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*
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* @return whether this content is in a document tree
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*/
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PRBool IsInDoc() const
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{
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return mParentPtrBits & PARENT_BIT_INDOCUMENT;
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}
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/**
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* Get the document that this content is currently in, if any. This will be
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* null if the content has no ancestor that is a document.
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*
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* @return the current document
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*/
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nsIDocument *GetCurrentDoc() const
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{
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return IsInDoc() ? GetOwnerDoc() : nsnull;
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}
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/**
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* Insert a content node at a particular index. This method handles calling
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* BindToTree on the child appropriately.
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*
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* @param aKid the content to insert
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* @param aIndex the index it is being inserted at (the index it will have
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* after it is inserted)
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* @param aNotify whether to notify the document (current document for
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* nsIContent, and |this| for nsIDocument) that the insert has
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* occurred
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*
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* @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more
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* than one element node as a child of a document. Doing this will also
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* assert -- you shouldn't be doing it! Check with
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* nsIDocument::GetRootContent() first if you're not sure. Apart from this
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* one constraint, this doesn't do any checking on whether aKid is a valid
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* child of |this|.
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*
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* @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
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*/
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virtual nsresult InsertChildAt(nsIContent* aKid, PRUint32 aIndex,
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PRBool aNotify) = 0;
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/**
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* Append a content node to the end of the child list. This method handles
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* calling BindToTree on the child appropriately.
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*
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* @param aKid the content to append
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* @param aNotify whether to notify the document (current document for
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* nsIContent, and |this| for nsIDocument) that the append has
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* occurred
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*
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* @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more
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* than one element node as a child of a document. Doing this will also
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* assert -- you shouldn't be doing it! Check with
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* nsIDocument::GetRootContent() first if you're not sure. Apart from this
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* one constraint, this doesn't do any checking on whether aKid is a valid
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* child of |this|.
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*
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* @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
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*/
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virtual nsresult AppendChildTo(nsIContent* aKid, PRBool aNotify) = 0;
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/**
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* Remove a child from this node. This method handles calling UnbindFromTree
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* on the child appropriately.
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*
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* @param aIndex the index of the child to remove
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* @param aNotify whether to notify the document (current document for
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* nsIContent, and |this| for nsIDocument) that the remove has
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* occurred
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*
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* Note: If there is no child at aIndex, this method will simply do nothing.
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*/
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virtual nsresult RemoveChildAt(PRUint32 aIndex, PRBool aNotify) = 0;
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/**
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* Get a property associated with this node.
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*
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* @param aPropertyName name of property to get.
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* @param aStatus out parameter for storing resulting status.
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* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
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* is not set.
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* @return the property. Null if the property is not set
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* (though a null return value does not imply the
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* property was not set, i.e. it can be set to null).
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*/
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void* GetProperty(nsIAtom *aPropertyName,
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nsresult *aStatus = nsnull) const
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{
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return GetProperty(0, aPropertyName, aStatus);
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}
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/**
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* Get a property associated with this node.
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*
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* @param aCategory category of property to get.
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* @param aPropertyName name of property to get.
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* @param aStatus out parameter for storing resulting status.
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* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
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* is not set.
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* @return the property. Null if the property is not set
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* (though a null return value does not imply the
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* property was not set, i.e. it can be set to null).
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*/
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virtual void* GetProperty(PRUint32 aCategory,
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nsIAtom *aPropertyName,
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nsresult *aStatus = nsnull) const;
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/**
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* Set a property to be associated with this node. This will overwrite an
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* existing value if one exists. The existing value is destroyed using the
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* destructor function given when that value was set.
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*
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* @param aPropertyName name of property to set.
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* @param aValue new value of property.
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* @param aDtor destructor function to be used when this property
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* is destroyed.
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*
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* @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property
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* was already set
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* @throws NS_ERROR_OUT_OF_MEMORY if that occurs
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*/
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nsresult SetProperty(nsIAtom *aPropertyName,
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void *aValue,
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NSPropertyDtorFunc aDtor = nsnull)
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{
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return SetProperty(0, aPropertyName, aValue, aDtor);
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}
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/**
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* Set a property to be associated with this node. This will overwrite an
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* existing value if one exists. The existing value is destroyed using the
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* destructor function given when that value was set.
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*
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* @param aCategory category of property to set.
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* @param aPropertyName name of property to set.
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* @param aValue new value of property.
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* @param aDtor destructor function to be used when this property
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* is destroyed.
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* @param aOldValue [out] previous value of property.
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*
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* @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property
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* was already set
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* @throws NS_ERROR_OUT_OF_MEMORY if that occurs
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*/
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virtual nsresult SetProperty(PRUint32 aCategory,
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nsIAtom *aPropertyName,
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void *aValue,
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NSPropertyDtorFunc aDtor = nsnull,
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void **aOldValue = nsnull);
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/**
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* Destroys a property associated with this node. The value is destroyed
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* using the destruction function given when that value was set.
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*
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* @param aPropertyName name of property to destroy.
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*
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* @throws NS_PROPTABLE_PROP_NOT_THERE if the property was not set
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*/
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nsresult DeleteProperty(nsIAtom *aPropertyName)
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{
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return DeleteProperty(0, aPropertyName);
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}
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/**
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* Destroys a property associated with this node. The value is destroyed
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* using the destruction function given when that value was set.
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*
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* @param aCategory category of property to destroy.
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* @param aPropertyName name of property to destroy.
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*
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* @throws NS_PROPTABLE_PROP_NOT_THERE if the property was not set
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*/
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virtual nsresult DeleteProperty(PRUint32 aCategory, nsIAtom *aPropertyName);
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/**
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* Unset a property associated with this node. The value will not be
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* destroyed but rather returned. It is the caller's responsibility to
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* destroy the value after that point.
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*
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* @param aPropertyName name of property to unset.
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* @param aStatus out parameter for storing resulting status.
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* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
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* is not set.
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* @return the property. Null if the property is not set
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* (though a null return value does not imply the
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* property was not set, i.e. it can be set to null).
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*/
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void* UnsetProperty(nsIAtom *aPropertyName,
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nsresult *aStatus = nsnull)
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{
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return UnsetProperty(0, aPropertyName, aStatus);
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}
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/**
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* Unset a property associated with this node. The value will not be
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* destroyed but rather returned. It is the caller's responsibility to
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* destroy the value after that point.
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*
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* @param aCategory category of property to unset.
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* @param aPropertyName name of property to unset.
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* @param aStatus out parameter for storing resulting status.
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* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
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* is not set.
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* @return the property. Null if the property is not set
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* (though a null return value does not imply the
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* property was not set, i.e. it can be set to null).
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*/
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virtual void* UnsetProperty(PRUint32 aCategory,
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nsIAtom *aPropertyName,
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nsresult *aStatus = nsnull);
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PRBool HasProperties() const
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{
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return HasFlag(NODE_HAS_PROPERTIES);
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}
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/**
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* Inform node of range ownership changes. This allows the node to do the
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* right thing to ranges in the face of changes to the content model.
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*
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* RangeRemove -- informs content that it no longer owns a range endpoint
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* GetRangeList -- returns the list of ranges that have one or both endpoints
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* within this content item
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*/
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/**
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* Inform node that it owns one or both range endpoints
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* @param aRange the range the node owns
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*/
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virtual nsresult RangeAdd(nsIDOMRange* aRange);
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/**
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* Inform node that it no longer owns either range endpoint
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* @param aRange the range the node no longer owns
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*/
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virtual void RangeRemove(nsIDOMRange* aRange);
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/**
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* Get the list of ranges that have either endpoint in this node
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* item.
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* @return the list of ranges owned partially by this node. The
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* nsVoidArray is owned by the node object and its lifetime is
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* controlled completely by the node object.
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*/
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virtual const nsVoidArray *GetRangeList() const;
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/**
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* Return the principal of this node. This is guaranteed to never be a null
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* pointer.
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*/
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nsIPrincipal* NodePrincipal() const {
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return mNodeInfo->NodeInfoManager()->DocumentPrincipal();
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}
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/**
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* Called before the capture phase of the event flow.
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* This is used to create the event target chain and implementations
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* should set the necessary members of nsEventChainPreVisitor.
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* At least aVisitor.mCanHandle must be set,
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* usually also aVisitor.mParentTarget if mCanHandle is PR_TRUE.
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* First one tells that this object can handle the aVisitor.mEvent event and
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* the latter one is the possible parent object for the event target chain.
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* @see nsEventDispatcher.h for more documentation about aVisitor.
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*
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* @param aVisitor the visitor object which is used to create the
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* event target chain for event dispatching.
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*
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* @note Only nsEventDispatcher should call this method.
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*/
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virtual nsresult PreHandleEvent(nsEventChainPreVisitor& aVisitor) = 0;
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/**
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* Called after the bubble phase of the system event group.
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* The default handling of the event should happen here.
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* @param aVisitor the visitor object which is used during post handling.
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*
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* @see nsEventDispatcher.h for documentation about aVisitor.
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* @note Only nsEventDispatcher should call this method.
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*/
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virtual nsresult PostHandleEvent(nsEventChainPostVisitor& aVisitor) = 0;
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/**
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* Dispatch an event.
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* @param aEvent the event that is being dispatched.
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* @param aDOMEvent the event that is being dispatched, use if you want to
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* dispatch nsIDOMEvent, not only nsEvent.
|
|
* @param aPresContext the current presentation context, can be nsnull.
|
|
* @param aEventStatus the status returned from the function, can be nsnull.
|
|
*
|
|
* @note If both aEvent and aDOMEvent are used, aEvent must be the internal
|
|
* event of the aDOMEvent.
|
|
*
|
|
* If aDOMEvent is not nsnull (in which case aEvent can be nsnull) it is used
|
|
* for dispatching, otherwise aEvent is used.
|
|
*
|
|
* @deprecated This method is here just until all the callers outside Gecko
|
|
* have been converted to use nsIDOMEventTarget::dispatchEvent.
|
|
*/
|
|
virtual nsresult DispatchDOMEvent(nsEvent* aEvent,
|
|
nsIDOMEvent* aDOMEvent,
|
|
nsPresContext* aPresContext,
|
|
nsEventStatus* aEventStatus) = 0;
|
|
|
|
/**
|
|
* Get the event listener manager, the guy you talk to to register for events
|
|
* on this node.
|
|
* @param aCreateIfNotFound If PR_FALSE, returns a listener manager only if
|
|
* one already exists. [IN]
|
|
* @param aResult The event listener manager [OUT]
|
|
*/
|
|
NS_IMETHOD GetListenerManager(PRBool aCreateIfNotFound,
|
|
nsIEventListenerManager** aResult);
|
|
|
|
/**
|
|
* Get the parent nsIContent for this node.
|
|
* @return the parent, or null if no parent or the parent is not an nsIContent
|
|
*/
|
|
nsIContent* GetParent() const
|
|
{
|
|
return NS_LIKELY(mParentPtrBits & PARENT_BIT_PARENT_IS_CONTENT) ?
|
|
NS_REINTERPRET_CAST(nsIContent*,
|
|
mParentPtrBits & ~kParentBitMask) :
|
|
nsnull;
|
|
}
|
|
|
|
/**
|
|
* Get the parent nsINode for this node. This can be either an nsIContent,
|
|
* an nsIDocument or an nsIAttribute.
|
|
* @return the parent node
|
|
*/
|
|
nsINode* GetNodeParent() const
|
|
{
|
|
return NS_REINTERPRET_CAST(nsINode*, mParentPtrBits & ~kParentBitMask);
|
|
}
|
|
|
|
/**
|
|
* Adds a mutation observer to be notified when this node, or any of its
|
|
* descendants, are modified. The node will hold a weak reference to the
|
|
* observer, which means that it is the responsibility of the observer to
|
|
* remove itself in case it dies before the node.
|
|
*/
|
|
virtual void AddMutationObserver(nsIMutationObserver* aMutationObserver);
|
|
|
|
/**
|
|
* Removes a mutation observer.
|
|
*/
|
|
virtual void RemoveMutationObserver(nsIMutationObserver* aMutationObserver);
|
|
|
|
// This class can be extended by subclasses that wish to store more
|
|
// information in the slots.
|
|
class nsSlots
|
|
{
|
|
public:
|
|
nsSlots(PtrBits aFlags) : mFlags(aFlags)
|
|
{
|
|
}
|
|
|
|
// If needed we could remove the vtable pointer this dtor causes by
|
|
// putting a DestroySlots function on nsINode
|
|
virtual ~nsSlots()
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Storage for flags for this node. These are the same flags as the
|
|
* mFlagsOrSlots member, but these are used when the slots class
|
|
* is allocated.
|
|
*/
|
|
PtrBits mFlags;
|
|
|
|
/**
|
|
* A list of mutation observers
|
|
*/
|
|
nsTObserverArray<nsIMutationObserver> mMutationObservers;
|
|
};
|
|
|
|
protected:
|
|
/**
|
|
* Functions for managing flags and slots
|
|
*/
|
|
|
|
// Override this function to create a custom slots class.
|
|
virtual nsINode::nsSlots* CreateSlots();
|
|
|
|
PRBool HasSlots() const
|
|
{
|
|
return !(mFlagsOrSlots & NODE_DOESNT_HAVE_SLOTS);
|
|
}
|
|
|
|
nsSlots* FlagsAsSlots() const
|
|
{
|
|
NS_ASSERTION(HasSlots(), "check HasSlots first");
|
|
return NS_REINTERPRET_CAST(nsSlots*, mFlagsOrSlots);
|
|
}
|
|
|
|
nsSlots* GetExistingSlots() const
|
|
{
|
|
return HasSlots() ? FlagsAsSlots() : nsnull;
|
|
}
|
|
|
|
nsSlots* GetSlots()
|
|
{
|
|
if (HasSlots()) {
|
|
return FlagsAsSlots();
|
|
}
|
|
|
|
nsSlots* slots = CreateSlots();
|
|
if (slots) {
|
|
mFlagsOrSlots = NS_REINTERPRET_CAST(PtrBits, slots);
|
|
}
|
|
|
|
return slots;
|
|
}
|
|
|
|
PtrBits GetFlags() const
|
|
{
|
|
return NS_UNLIKELY(HasSlots()) ? FlagsAsSlots()->mFlags : mFlagsOrSlots;
|
|
}
|
|
|
|
PRBool HasFlag(PtrBits aFlag) const
|
|
{
|
|
return !!(GetFlags() & aFlag);
|
|
}
|
|
|
|
void SetFlags(PtrBits aFlagsToSet)
|
|
{
|
|
NS_ASSERTION(!(aFlagsToSet & (NODE_IS_ANONYMOUS | NODE_MAY_HAVE_FRAME)) ||
|
|
IsNodeOfType(eCONTENT),
|
|
"Flag only permitted on nsIContent nodes");
|
|
PtrBits* flags = HasSlots() ? &FlagsAsSlots()->mFlags :
|
|
&mFlagsOrSlots;
|
|
*flags |= aFlagsToSet;
|
|
}
|
|
|
|
void UnsetFlags(PtrBits aFlagsToUnset)
|
|
{
|
|
PtrBits* flags = HasSlots() ? &FlagsAsSlots()->mFlags :
|
|
&mFlagsOrSlots;
|
|
*flags &= ~aFlagsToUnset;
|
|
}
|
|
|
|
nsCOMPtr<nsINodeInfo> mNodeInfo;
|
|
|
|
enum { PARENT_BIT_INDOCUMENT = 1 << 0, PARENT_BIT_PARENT_IS_CONTENT = 1 << 1 };
|
|
enum { kParentBitMask = 0x3 };
|
|
|
|
PtrBits mParentPtrBits;
|
|
|
|
/**
|
|
* Used for either storing flags for this node or a pointer to
|
|
* this contents nsContentSlots. See the definition of the
|
|
* NODE_* macros for the layout of the bits in this
|
|
* member.
|
|
*/
|
|
PtrBits mFlagsOrSlots;
|
|
|
|
#endif // MOZILLA_INTERNAL_API
|
|
};
|
|
|
|
NS_DEFINE_STATIC_IID_ACCESSOR(nsINode_base, NS_INODE_IID)
|
|
|
|
#endif /* nsINode_h___ */
|