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99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef JoinElementTxn_h__
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#define JoinElementTxn_h__
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#include "EditTxn.h"
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#include "nsIDOMNode.h"
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#include "nsCOMPtr.h"
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#include "nsIEditor.h"
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#define JOIN_ELEMENT_TXN_CID \
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{/* 9bc5f9f0-ac48-11d2-86d8-000064657374 */ \
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0x9bc5f9f0, 0xac48, 0x11d2, \
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{0x86, 0xd8, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }
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/**
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* A transaction that joins two elements E1 (left node) and E2 (right node)
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* into a single node E.
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* The children of E are the children of E1 followed by the children of E2.
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* After Do() and Redo(), E1 is removed from the content tree and E2 remains.
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*/
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class JoinElementTxn : public EditTxn
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{
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public:
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static const nsIID& GetCID() { static nsIID iid = JOIN_ELEMENT_TXN_CID; return iid; }
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/** initialize the transaction
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* @param aEditor the provider of core editing operations
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* @param aLeftNode the first of two nodes to join
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* @param aRightNode the second of two nodes to join
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*/
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NS_IMETHOD Init(nsIEditor *aEditor,
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nsIDOMNode *aLeftNode,
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nsIDOMNode *aRightNode);
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protected:
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JoinElementTxn();
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public:
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virtual ~JoinElementTxn();
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NS_IMETHOD Do(void);
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NS_IMETHOD Undo(void);
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// NS_IMETHOD Redo(void);
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NS_IMETHOD GetIsTransient(PRBool *aIsTransient);
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NS_IMETHOD Merge(PRBool *aDidMerge, nsITransaction *aTransaction);
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NS_IMETHOD Write(nsIOutputStream *aOutputStream);
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NS_IMETHOD GetUndoString(nsString *aString);
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NS_IMETHOD GetRedoString(nsString *aString);
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protected:
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/** the elements to operate upon.
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* After the merge, mRightNode remains and mLeftNode is removed from the content tree.
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*/
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nsCOMPtr<nsIDOMNode> mLeftNode;
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nsCOMPtr<nsIDOMNode> mRightNode;
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/** the offset into mNode where the children of mElement are split (for undo).<BR>
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* mOffset is the index of the first child in the right node.
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* -1 means the left node had no children.
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*/
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PRUint32 mOffset;
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/** the parent node containing mLeftNode and mRightNode */
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nsCOMPtr<nsIDOMNode> mParent;
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nsIEditor* mEditor;
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friend class TransactionFactory;
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};
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#endif
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