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#ifndef InsertElementTxn_h__
#define InsertElementTxn_h__

#include "EditTxn.h"
#include "nsIEditor.h"
#include "nsIDOMNode.h"
#include "nsCOMPtr.h"

#define INSERT_ELEMENT_TXN_CID \
{/* b5762440-cbb0-11d2-86db-000064657374 */ \
0xb5762440, 0xcbb0, 0x11d2, \
{0x86, 0xdb, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }

/**
 * A transaction that inserts a single element
 */
class InsertElementTxn : public EditTxn
{
public:

  static const nsIID& GetCID() { static nsIID iid = INSERT_ELEMENT_TXN_CID; return iid; }

  /** initialize the transaction.
    * @param aNode   the node to insert
    * @param aParent the node to insert into
    * @param aOffset the offset in aParent to insert aNode
    */
  NS_IMETHOD Init(nsIDOMNode *aNode,
                  nsIDOMNode *aParent,
                  PRInt32     aOffset,
                  nsIEditor  *aEditor);

private:
  InsertElementTxn();

public:

  virtual ~InsertElementTxn();

  NS_IMETHOD DoTransaction(void);

  NS_IMETHOD UndoTransaction(void);

  NS_IMETHOD Merge(nsITransaction *aTransaction, PRBool *aDidMerge);

  NS_IMETHOD GetTxnDescription(nsAWritableString& aTxnDescription);

protected:
  
  /** the element to insert */
  nsCOMPtr<nsIDOMNode> mNode;

  /** the node into which the new node will be inserted */
  nsCOMPtr<nsIDOMNode> mParent;

  /** the editor for this transaction */
  nsIEditor*           mEditor;

  /** the index in mParent for the new node */
  PRInt32 mOffset;

  friend class TransactionFactory;

};

#endif