gecko-dev/editor/base/ChangeAttributeTxn.cpp

123 строки
3.6 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 "ChangeAttributeTxn.h"
#include "nsIDOMElement.h"
#include "nsEditor.h"
ChangeAttributeTxn::ChangeAttributeTxn()
: EditTxn()
{
}
ChangeAttributeTxn::~ChangeAttributeTxn()
{
}
NS_IMETHODIMP ChangeAttributeTxn::Init(nsIEditor *aEditor,
nsIDOMElement *aElement,
const nsAReadableString& aAttribute,
const nsAReadableString& 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.SetLength(0);
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 (PR_FALSE==mUndoValue.IsEmpty())
mAttributeWasSet=PR_TRUE;
// XXX: end hack
// now set the attribute to the new value
if (PR_FALSE==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=NS_OK;
if (PR_TRUE==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 (PR_FALSE==mRemoveAttribute)
result = mElement->SetAttribute(mAttribute, mValue);
else
result = mElement->RemoveAttribute(mAttribute);
return result;
}
NS_IMETHODIMP ChangeAttributeTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP ChangeAttributeTxn::GetTxnDescription(nsAWritableString& aString)
{
aString.Assign(NS_LITERAL_STRING("ChangeAttributeTxn: "));
if (PR_FALSE==mRemoveAttribute)
aString += NS_LITERAL_STRING("[mRemoveAttribute == false] ");
else
aString += NS_LITERAL_STRING("[mRemoveAttribute == true] ");
aString += mAttribute;
return NS_OK;
}