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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "DeleteTextTxn.h"
#include "nsIDOMCharacterData.h"
#include "nsISelection.h"
#include "nsSelectionState.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#endif
DeleteTextTxn::DeleteTextTxn()
: EditTxn()
,mEditor(nsnull)
,mElement()
,mOffset(0)
,mNumCharsToDelete(0)
,mRangeUpdater(nsnull)
{
}
DeleteTextTxn::~DeleteTextTxn()
{
}
NS_IMETHODIMP DeleteTextTxn::Init(nsIEditor *aEditor,
nsIDOMCharacterData *aElement,
PRUint32 aOffset,
PRUint32 aNumCharsToDelete,
nsRangeUpdater *aRangeUpdater)
{
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.Truncate();
mRangeUpdater = aRangeUpdater;
return NS_OK;
}
NS_IMETHODIMP DeleteTextTxn::DoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("Do Delete Text\n"); }
#endif
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_FAILED(result)) return result;
if (mRangeUpdater)
mRangeUpdater->SelAdjDeleteText(mElement, mOffset, mNumCharsToDelete);
// only set selection to deletion point if editor gives permission
PRBool bAdjustSelection;
mEditor->ShouldTxnSetSelection(&bAdjustSelection);
if (bAdjustSelection)
{
nsCOMPtr<nsISelection> 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 deletetext.");
}
else
{
// do nothing - dom range gravity will adjust selection
}
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::UndoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("Undo Delete Text\n"); }
#endif
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
return mElement->InsertData(mOffset, mDeletedText);
}
NS_IMETHODIMP DeleteTextTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
{
if (aDidMerge)
*aDidMerge = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP DeleteTextTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("DeleteTextTxn: ");
aString += mDeletedText;
return NS_OK;
}
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