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

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef DeleteTextTxn_h__
#define DeleteTextTxn_h__
#include "EditTxn.h"
#include "nsCOMPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsID.h"
#include "nsIDOMCharacterData.h"
#include "nsString.h"
#include "nscore.h"
class nsEditor;
class nsRangeUpdater;
/**
* A transaction that removes text from a content node.
*/
class DeleteTextTxn : public EditTxn
{
public:
/** initialize the transaction.
* @param aEditor the provider of basic editing operations
* @param aElement the content node to remove text from
* @param aOffset the location in aElement to begin the deletion
* @param aNumCharsToDelete the number of characters to delete. Not the number of bytes!
*/
NS_IMETHOD Init(nsEditor* aEditor,
nsIDOMCharacterData* aCharData,
uint32_t aOffset,
uint32_t aNumCharsToDelete,
nsRangeUpdater* aRangeUpdater);
DeleteTextTxn();
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DeleteTextTxn, EditTxn)
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
NS_DECL_EDITTXN
uint32_t GetOffset() { return mOffset; }
uint32_t GetNumCharsToDelete() { return mNumCharsToDelete; }
protected:
/** the provider of basic editing operations */
nsEditor* mEditor;
/** the CharacterData node to operate upon */
nsCOMPtr<nsIDOMCharacterData> mCharData;
/** the offset into mCharData where the deletion is to take place */
uint32_t mOffset;
/** the number of characters to delete */
uint32_t mNumCharsToDelete;
/** the text that was deleted */
nsString mDeletedText;
/** range updater object */
nsRangeUpdater* mRangeUpdater;
};
#endif