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123 lines
3.6 KiB
C++
123 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "ChangeAttributeTxn.h"
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#include "nsIDOMElement.h"
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#include "nsEditor.h"
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ChangeAttributeTxn::ChangeAttributeTxn()
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: EditTxn()
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{
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}
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ChangeAttributeTxn::~ChangeAttributeTxn()
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{
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}
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NS_IMETHODIMP ChangeAttributeTxn::Init(nsIEditor *aEditor,
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nsIDOMElement *aElement,
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const nsAReadableString& aAttribute,
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const nsAReadableString& aValue,
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PRBool aRemoveAttribute)
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{
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NS_ASSERTION(aEditor && aElement, "bad arg");
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if (!aEditor || !aElement) { return NS_ERROR_NULL_POINTER; }
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mEditor = aEditor;
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mElement = do_QueryInterface(aElement);
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mAttribute = aAttribute;
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mValue = aValue;
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mRemoveAttribute = aRemoveAttribute;
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mAttributeWasSet=PR_FALSE;
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mUndoValue.SetLength(0);
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return NS_OK;
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}
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NS_IMETHODIMP ChangeAttributeTxn::DoTransaction(void)
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{
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NS_ASSERTION(mEditor && mElement, "bad state");
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if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
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// need to get the current value of the attribute and save it, and set mAttributeWasSet
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nsresult result = mEditor->GetAttributeValue(mElement, mAttribute, mUndoValue, &mAttributeWasSet);
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// XXX: hack until attribute-was-set code is implemented
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if (PR_FALSE==mUndoValue.IsEmpty())
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mAttributeWasSet=PR_TRUE;
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// XXX: end hack
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// now set the attribute to the new value
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if (PR_FALSE==mRemoveAttribute)
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result = mElement->SetAttribute(mAttribute, mValue);
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else
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result = mElement->RemoveAttribute(mAttribute);
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return result;
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}
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NS_IMETHODIMP ChangeAttributeTxn::UndoTransaction(void)
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{
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NS_ASSERTION(mEditor && mElement, "bad state");
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if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
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nsresult result=NS_OK;
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if (PR_TRUE==mAttributeWasSet)
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result = mElement->SetAttribute(mAttribute, mUndoValue);
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else
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result = mElement->RemoveAttribute(mAttribute);
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return result;
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}
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NS_IMETHODIMP ChangeAttributeTxn::RedoTransaction(void)
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{
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NS_ASSERTION(mEditor && mElement, "bad state");
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if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
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nsresult result;
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if (PR_FALSE==mRemoveAttribute)
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result = mElement->SetAttribute(mAttribute, mValue);
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else
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result = mElement->RemoveAttribute(mAttribute);
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return result;
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}
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NS_IMETHODIMP ChangeAttributeTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
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{
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if (nsnull!=aDidMerge)
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*aDidMerge=PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP ChangeAttributeTxn::GetTxnDescription(nsAWritableString& aString)
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{
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aString.Assign(NS_LITERAL_STRING("ChangeAttributeTxn: "));
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if (PR_FALSE==mRemoveAttribute)
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aString += NS_LITERAL_STRING("[mRemoveAttribute == false] ");
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else
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aString += NS_LITERAL_STRING("[mRemoveAttribute == true] ");
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aString += mAttribute;
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return NS_OK;
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}
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