gecko-dev/editor/base/ChangeAttributeTxn.cpp
1999-09-21 22:31:27 +00:00

140 lines
3.8 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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "ChangeAttributeTxn.h"
#include "nsIDOMElement.h"
#include "nsEditor.h"
ChangeAttributeTxn::ChangeAttributeTxn()
: EditTxn()
{
SetTransactionDescriptionID( kTransactionID );
/* log description initialized in parent constructor */
}
ChangeAttributeTxn::~ChangeAttributeTxn()
{
}
NS_IMETHODIMP ChangeAttributeTxn::Init(nsIEditor *aEditor,
nsIDOMElement *aElement,
const nsString& aAttribute,
const nsString& 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="";
return NS_OK;
}
NS_IMETHODIMP ChangeAttributeTxn::Do(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.Equals(""))
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::Undo(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::Redo(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(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP ChangeAttributeTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP ChangeAttributeTxn::GetUndoString(nsString *aString)
{
if (nsnull!=aString)
{
if (PR_FALSE==mRemoveAttribute)
*aString="Change Attribute: ";
else
*aString="Remove Attribute: ";
*aString += mAttribute;
}
return NS_OK;
}
NS_IMETHODIMP ChangeAttributeTxn::GetRedoString(nsString *aString)
{
if (nsnull!=aString)
{
if (PR_FALSE==mRemoveAttribute)
*aString="Change Attribute: ";
else
*aString="Add Attribute: ";
*aString += mAttribute;
}
return NS_OK;
}