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#ifndef CreateElementTxn_h__
#define CreateElementTxn_h__

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

/**
 * A transaction that creates a new node in the content tree.
 */
class CreateElementTxn : public EditTxn
{
public:
  enum { eAppend=-1 };

  /** Initialize the transaction.
    * @param aEditor the provider of basic editing functionality
    * @param aTag    the tag (P, HR, TABLE, etc.) for the new element
    * @param aParent the node into which the new element will be inserted
    * @param aOffsetInParent the location in aParent to insert the new element
    *                        if eAppend, the new element is appended as the last child
    */
  NS_IMETHOD Init(nsEditor *aEditor,
                  const nsAString& aTag,
                  nsIDOMNode *aParent,
                  PRUint32 aOffsetInParent);

  CreateElementTxn();

  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(CreateElementTxn, EditTxn)
  NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);

  NS_DECL_EDITTXN

  NS_IMETHOD RedoTransaction();

  NS_IMETHOD GetNewNode(nsIDOMNode **aNewNode);

protected:
  
  /** the document into which the new node will be inserted */
  nsEditor* mEditor;
  
  /** the tag (mapping to object type) for the new element */
  nsString mTag;

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

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

  /** the new node to insert */
  nsCOMPtr<nsIDOMNode> mNewNode;  

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

#endif
