gecko/editor/libeditor/base/PlaceholderTxn.h

112 lines
4.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef AggregatePlaceholderTxn_h__
#define AggregatePlaceholderTxn_h__
#include "EditAggregateTxn.h"
#include "nsEditorUtils.h"
#include "nsIAbsorbingTransaction.h"
#include "nsIDOMNode.h"
#include "nsCOMPtr.h"
#include "nsWeakPtr.h"
#include "nsWeakReference.h"
#include "nsAutoPtr.h"
class nsHTMLEditor;
class IMETextTxn;
/**
* An aggregate transaction that knows how to absorb all subsequent
* transactions with the same name. This transaction does not "Do" anything.
* But it absorbs other transactions via merge, and can undo/redo the
* transactions it has absorbed.
*/
class PlaceholderTxn : public EditAggregateTxn,
public nsIAbsorbingTransaction,
public nsSupportsWeakReference
{
public:
NS_DECL_ISUPPORTS_INHERITED
PlaceholderTxn();
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(PlaceholderTxn, EditAggregateTxn)
// ------------ EditAggregateTxn -----------------------
NS_DECL_EDITTXN
NS_IMETHOD RedoTransaction();
NS_IMETHOD Merge(nsITransaction *aTransaction, PRBool *aDidMerge);
// ------------ nsIAbsorbingTransaction -----------------------
NS_IMETHOD Init(nsIAtom *aName, nsSelectionState *aSelState, nsIEditor *aEditor);
NS_IMETHOD GetTxnName(nsIAtom **aName);
NS_IMETHOD StartSelectionEquals(nsSelectionState *aSelState, PRBool *aResult);
NS_IMETHOD EndPlaceHolderBatch();
NS_IMETHOD ForwardEndBatchTo(nsIAbsorbingTransaction *aForwardingAddress);
NS_IMETHOD Commit();
NS_IMETHOD RememberEndingSelection();
protected:
/** the presentation shell, which we'll need to get the selection */
PRBool mAbsorb; // do we auto absorb any and all transaction?
nsWeakPtr mForwarding;
IMETextTxn *mIMETextTxn; // first IME txn in this placeholder - used for IME merging
// non-owning for now - can't nsCOMPtr it due to broken transaction interfaces
PRBool mCommitted; // do we stop auto absorbing any matching placeholder txns?
// these next two members store the state of the selection in a safe way.
// selection at the start of the txn is stored, as is the selection at the end.
// This is so that UndoTransaction() and RedoTransaction() can restore the
// selection properly.
nsAutoPtr<nsSelectionState> mStartSel; // use a pointer because this is constructed before we exist
nsSelectionState mEndSel;
nsIEditor* mEditor; /** the editor for this transaction */
};
#endif