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#ifndef DeleteElementTxn_h__
#define DeleteElementTxn_h__

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

#define DELETE_ELEMENT_TXN_CID \
{/* 6fd77770-ac49-11d2-86d8-000064657374 */ \
0x6fd77770, 0xac49, 0x11d2, \
{0x86, 0xd8, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }

/**
 * A transaction that deletes a single element
 */
class DeleteElementTxn : public EditTxn
{
public:

  static const nsIID& GetCID() { static nsIID iid = DELETE_ELEMENT_TXN_CID; return iid; }
 
  /** initialize the transaction.
    * @param aElement the node to delete
    */
  NS_IMETHOD Init(nsIDOMNode *aElement);

private:
  DeleteElementTxn();

public:

  virtual ~DeleteElementTxn();

  NS_IMETHOD DoTransaction(void);

  NS_IMETHOD UndoTransaction(void);

  NS_IMETHOD RedoTransaction(void);

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

  NS_IMETHOD GetTxnDescription(nsAWritableString& aTxnDescription);

protected:
  
  /** the element to delete */
  nsCOMPtr<nsIDOMNode> mElement;

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

  /** the index in mParent for the new node */
  PRUint32 mOffsetInParent;

  /** the node we will insert mNewNode before.  We compute this ourselves. */
  nsCOMPtr<nsIDOMNode> mRefNode;

  friend class TransactionFactory;

};

#endif