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 * The Original Code is mozilla.org code.
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#ifndef nsEditorTxnLog_h__
#define nsEditorTxnLog_h__

#include "nsITransaction.h"
#include "nsITransactionManager.h"
#include "nsITransactionListener.h"

class nsHTMLEditorLog;

/** implementation of a transaction listener object.
 *
 */
class nsEditorTxnLog : public nsITransactionListener
{
private:

  nsHTMLEditorLog *mEditorLog;
  PRInt32 mIndentLevel;
  PRInt32 mBatchCount;

public:

  /** The default constructor.
   */
  nsEditorTxnLog(nsHTMLEditorLog *aEditorLog=0);

  /** The default destructor.
   */
  virtual ~nsEditorTxnLog();

  /* Macro for AddRef(), Release(), and QueryInterface() */
  NS_DECL_ISUPPORTS

  /* nsITransactionListener method implementations. */
  NS_IMETHOD WillDo(nsITransactionManager *aTxMgr, nsITransaction *aTransaction, PRBool *aInterrupt);
  NS_IMETHOD DidDo(nsITransactionManager *aTxMgr, nsITransaction *aTransaction, nsresult aDoResult);
  NS_IMETHOD WillUndo(nsITransactionManager *aTxMgr, nsITransaction *aTransaction, PRBool *aInterrupt);
  NS_IMETHOD DidUndo(nsITransactionManager *aTxMgr, nsITransaction *aTransaction, nsresult aUndoResult);
  NS_IMETHOD WillRedo(nsITransactionManager *aTxMgr, nsITransaction *aTransaction, PRBool *aInterrupt);
  NS_IMETHOD DidRedo(nsITransactionManager *aTxMgr, nsITransaction *aTransaction, nsresult aRedoResult);
  NS_IMETHOD WillBeginBatch(nsITransactionManager *aTxMgr, PRBool *aInterrupt);
  NS_IMETHOD DidBeginBatch(nsITransactionManager *aTxMgr, nsresult aResult);
  NS_IMETHOD WillEndBatch(nsITransactionManager *aTxMgr, PRBool *aInterrupt);
  NS_IMETHOD DidEndBatch(nsITransactionManager *aTxMgr, nsresult aResult);
  NS_IMETHOD WillMerge(nsITransactionManager *aTxMgr, nsITransaction *aTopTransaction, nsITransaction *aTransaction, PRBool *aInterrupt);
  NS_IMETHOD DidMerge(nsITransactionManager *aTxMgr, nsITransaction *aTopTransaction, nsITransaction *aTransaction, PRBool aDidMerge, nsresult aMergeResult);


private:

  /* nsEditorTxnLog private methods. */
  nsresult PrintIndent(PRInt32 aIndentLevel);
  nsresult Write(const char *aBuffer);
  nsresult WriteInt(PRInt32 aInt);
  nsresult WriteTransaction(nsITransaction *aTransaction);
  nsresult Flush();
};

#endif // nsEditorTxnLog_h__
