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