pjs/editor/libeditor/base/PlaceholderTxn.h

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/* -*- 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 1.1 (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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#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"
#define PLACEHOLDER_TXN_CID \
{/* {0CE9FB00-D9D1-11d2-86DE-000064657374} */ \
0x0CE9FB00, 0xD9D1, 0x11d2, \
{0x86, 0xde, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }
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:
static const nsIID& GetCID() { static nsIID iid = PLACEHOLDER_TXN_CID; return iid; }
NS_DECL_ISUPPORTS_INHERITED
private:
PlaceholderTxn();
public:
virtual ~PlaceholderTxn();
// ------------ EditAggregateTxn -----------------------
NS_IMETHOD Do(void);
NS_IMETHOD Undo(void);
NS_IMETHOD Redo(void);
NS_IMETHOD Merge(PRBool *aDidMerge, nsITransaction *aTransaction);
// ------------ nsIAbsorbingTransaction -----------------------
NS_IMETHOD Init(nsWeakPtr aPresShellWeak, nsIAtom *aName, nsSelectionState *aSelState);
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();
friend class TransactionFactory;
enum { kTransactionID = 11260 };
protected:
/** the presentation shell, which we'll need to get the selection */
nsWeakPtr mPresShellWeak; // weak reference to the nsIPresShell
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 - cant 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 Undo() and Redo() can restore the selection properly.
nsSelectionState *mStartSel; // use a pointer because this is constructed before we exist
nsSelectionState mEndSel;
};
#endif