gecko-dev/editor/libeditor/base/InsertTextTxn.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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#ifndef InsertTextTxn_h__
#define InsertTextTxn_h__
#include "EditTxn.h"
#include "nsIDOMCharacterData.h"
#include "nsIEditor.h"
#include "nsCOMPtr.h"
#define INSERT_TEXT_TXN_CID \
{/* 93276f00-ab2c-11d2-8f4b-006008159b0c*/ \
0x93276f00, 0xab2c, 0x11d2, \
{0x8f, 0xb4, 0x0, 0x60, 0x8, 0x15, 0x9b, 0xc} }
class nsIPresShell;
/**
* A transaction that inserts text into a content node.
*/
class InsertTextTxn : public EditTxn
{
public:
static const nsIID& GetCID() { static const nsIID iid = INSERT_TEXT_TXN_CID; return iid; }
virtual ~InsertTextTxn();
/** used to name aggregate transactions that consist only of a single InsertTextTxn,
* or a DeleteSelection followed by an InsertTextTxn.
*/
static nsIAtom *gInsertTextTxnName;
/** initialize the transaction
* @param aElement the text content node
* @param aOffset the location in aElement to do the insertion
* @param aString the new text to insert
* @param aPresShell used to get and set the selection
*/
NS_IMETHOD Init(nsIDOMCharacterData *aElement,
PRUint32 aOffset,
const nsAString& aString,
nsIEditor *aEditor);
private:
InsertTextTxn();
public:
NS_IMETHOD DoTransaction(void);
NS_IMETHOD UndoTransaction(void);
NS_IMETHOD Merge(nsITransaction *aTransaction, PRBool *aDidMerge);
NS_IMETHOD GetTxnDescription(nsAString& aTxnDescription);
// nsISupports declarations
// override QueryInterface to handle InsertTextTxn request
NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
/** return the string data associated with this transaction */
NS_IMETHOD GetData(nsString& aResult);
/** must be called before any InsertTextTxn is instantiated */
static nsresult ClassInit();
/** must be called once we are guaranteed all InsertTextTxn have completed */
static nsresult ClassShutdown();
protected:
/** return PR_TRUE if aOtherTxn immediately follows this txn */
virtual PRBool IsSequentialInsert(InsertTextTxn *aOtherTxn);
/** the text element to operate upon */
nsCOMPtr<nsIDOMCharacterData> mElement;
/** the offset into mElement where the insertion is to take place */
PRUint32 mOffset;
/** the text to insert into mElement at mOffset */
nsString mStringToInsert;
/** the editor, which we'll need to get the selection */
nsIEditor *mEditor;
friend class TransactionFactory;
friend class nsDerivedSafe<InsertTextTxn>; // work around for a compiler bug
};
#endif