gecko-dev/editor/base/DeleteTextTxn.cpp

139 строки
4.2 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#include "DeleteTextTxn.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMSelection.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#else
static const PRBool gNoisy = PR_FALSE;
#endif
DeleteTextTxn::DeleteTextTxn()
: EditTxn()
{
SetTransactionDescriptionID( kTransactionID );
/* log description initialized in parent constructor */
}
DeleteTextTxn::~DeleteTextTxn()
{
}
NS_IMETHODIMP DeleteTextTxn::Init(nsIEditor *aEditor,
nsIDOMCharacterData *aElement,
PRUint32 aOffset,
PRUint32 aNumCharsToDelete)
{
NS_ASSERTION(aEditor&&aElement, "bad arg");
if (!aEditor || !aElement) { return NS_ERROR_NULL_POINTER; }
mEditor = aEditor;
mElement = do_QueryInterface(aElement);
mOffset = aOffset;
mNumCharsToDelete = aNumCharsToDelete;
NS_ASSERTION(0!=aNumCharsToDelete, "bad arg, numCharsToDelete");
PRUint32 count;
aElement->GetLength(&count);
NS_ASSERTION(count>=aNumCharsToDelete, "bad arg, numCharsToDelete. Not enough characters in node");
NS_ASSERTION(count>=aOffset+aNumCharsToDelete, "bad arg, numCharsToDelete. Not enough characters in node");
mDeletedText = "";
return NS_OK;
}
NS_IMETHODIMP DeleteTextTxn::Do(void)
{
if (gNoisy) { printf("Do Delete Text\n"); }
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
// get the text that we're about to delete
nsresult result = mElement->SubstringData(mOffset, mNumCharsToDelete, mDeletedText);
NS_ASSERTION(NS_SUCCEEDED(result), "could not get text to delete.");
result = mElement->DeleteData(mOffset, mNumCharsToDelete);
if (NS_SUCCEEDED(result))
{
nsCOMPtr<nsIDOMSelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_FAILED(result)) return result;
if (!selection) return NS_ERROR_NULL_POINTER;
result = selection->Collapse(mElement, mOffset);
NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after undo of insert.");
}
return result;
}
//XXX: we may want to store the selection state and restore it properly
// was it an insertion point or an extended selection?
NS_IMETHODIMP DeleteTextTxn::Undo(void)
{
if (gNoisy) { printf("Undo Delete Text\n"); }
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
nsresult result;
result = mElement->InsertData(mOffset, mDeletedText);
if (NS_SUCCEEDED(result))
{
nsCOMPtr<nsIDOMSelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_FAILED(result)) return result;
if (!selection) return NS_ERROR_NULL_POINTER;
result = selection->Collapse(mElement, mOffset);
NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after undo of insert.");
}
return result;
}
NS_IMETHODIMP DeleteTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP DeleteTextTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP DeleteTextTxn::GetUndoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Insert Text: ";
*aString += mDeletedText;
}
return NS_OK;
}
NS_IMETHODIMP DeleteTextTxn::GetRedoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Remove Text: ";
*aString += mDeletedText;
}
return NS_OK;
}