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64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef JoinElementTxn_h__
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#define JoinElementTxn_h__
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#include "EditTxn.h" // for EditTxn, NS_DECL_EDITTXN
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#include "nsCOMPtr.h" // for nsCOMPtr
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#include "nsCycleCollectionParticipant.h"
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#include "nsID.h" // for REFNSIID
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#include "nscore.h" // for NS_IMETHOD
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class nsEditor;
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class nsINode;
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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 DoTransaction() and RedoTransaction(), E1 is removed from the content
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* 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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/** 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(nsEditor *aEditor,
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nsINode *aLeftNode,
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nsINode *aRightNode);
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JoinElementTxn();
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(JoinElementTxn, EditTxn)
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NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
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NS_DECL_EDITTXN
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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<nsINode> mLeftNode;
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nsCOMPtr<nsINode> 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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uint32_t mOffset;
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/** the parent node containing mLeftNode and mRightNode */
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nsCOMPtr<nsINode> mParent;
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nsEditor* mEditor;
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};
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#endif
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