gecko/editor/libeditor/base/ChangeAttributeTxn.cpp

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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 "ChangeAttributeTxn.h"
#include "nsIDOMElement.h"
ChangeAttributeTxn::ChangeAttributeTxn()
: EditTxn()
{
}
NS_IMPL_CYCLE_COLLECTION_CLASS(ChangeAttributeTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ChangeAttributeTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mElement)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ChangeAttributeTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ChangeAttributeTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
NS_IMETHODIMP ChangeAttributeTxn::Init(nsIEditor *aEditor,
nsIDOMElement *aElement,
const nsAString& aAttribute,
const nsAString& aValue,
PRBool aRemoveAttribute)
{
NS_ASSERTION(aEditor && aElement, "bad arg");
if (!aEditor || !aElement) { return NS_ERROR_NULL_POINTER; }
mEditor = aEditor;
mElement = do_QueryInterface(aElement);
mAttribute = aAttribute;
mValue = aValue;
mRemoveAttribute = aRemoveAttribute;
mAttributeWasSet=PR_FALSE;
mUndoValue.Truncate();
return NS_OK;
}
NS_IMETHODIMP ChangeAttributeTxn::DoTransaction(void)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
// need to get the current value of the attribute and save it, and set mAttributeWasSet
nsresult result = mEditor->GetAttributeValue(mElement, mAttribute, mUndoValue, &mAttributeWasSet);
// XXX: hack until attribute-was-set code is implemented
if (!mUndoValue.IsEmpty())
mAttributeWasSet = PR_TRUE;
// XXX: end hack
// now set the attribute to the new value
if (!mRemoveAttribute)
result = mElement->SetAttribute(mAttribute, mValue);
else
result = mElement->RemoveAttribute(mAttribute);
return result;
}
NS_IMETHODIMP ChangeAttributeTxn::UndoTransaction(void)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
nsresult result;
if (mAttributeWasSet)
result = mElement->SetAttribute(mAttribute, mUndoValue);
else
result = mElement->RemoveAttribute(mAttribute);
return result;
}
NS_IMETHODIMP ChangeAttributeTxn::RedoTransaction(void)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
nsresult result;
if (!mRemoveAttribute)
result = mElement->SetAttribute(mAttribute, mValue);
else
result = mElement->RemoveAttribute(mAttribute);
return result;
}
NS_IMETHODIMP ChangeAttributeTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("ChangeAttributeTxn: [mRemoveAttribute == ");
if (!mRemoveAttribute)
aString.AppendLiteral("false] ");
else
aString.AppendLiteral("true] ");
aString += mAttribute;
return NS_OK;
}