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lightning-sunbird  0.9+nobinonly
ChangeAttributeTxn.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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00010  * Software distributed under the License is distributed on an "AS IS" basis,
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00015  * The Original Code is mozilla.org code.
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00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
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00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
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00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include "ChangeAttributeTxn.h"
00039 #include "nsIDOMElement.h"
00040 
00041 ChangeAttributeTxn::ChangeAttributeTxn()
00042   : EditTxn()
00043 {
00044 }
00045 
00046 ChangeAttributeTxn::~ChangeAttributeTxn()
00047 {
00048 }
00049 
00050 NS_IMETHODIMP ChangeAttributeTxn::Init(nsIEditor      *aEditor,
00051                                        nsIDOMElement  *aElement,
00052                                        const nsAString& aAttribute,
00053                                        const nsAString& aValue,
00054                                        PRBool aRemoveAttribute)
00055 {
00056   NS_ASSERTION(aEditor && aElement, "bad arg");
00057   if (!aEditor || !aElement) { return NS_ERROR_NULL_POINTER; }
00058 
00059   mEditor = aEditor;
00060   mElement = do_QueryInterface(aElement);
00061   mAttribute = aAttribute;
00062   mValue = aValue;
00063   mRemoveAttribute = aRemoveAttribute;
00064   mAttributeWasSet=PR_FALSE;
00065   mUndoValue.Truncate();
00066   return NS_OK;
00067 }
00068 
00069 NS_IMETHODIMP ChangeAttributeTxn::DoTransaction(void)
00070 {
00071   NS_ASSERTION(mEditor && mElement, "bad state");
00072   if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
00073 
00074   // need to get the current value of the attribute and save it, and set mAttributeWasSet
00075   nsresult result = mEditor->GetAttributeValue(mElement, mAttribute, mUndoValue, &mAttributeWasSet);
00076   // XXX: hack until attribute-was-set code is implemented
00077   if (!mUndoValue.IsEmpty())
00078     mAttributeWasSet = PR_TRUE;
00079   // XXX: end hack
00080   
00081   // now set the attribute to the new value
00082   if (!mRemoveAttribute)
00083     result = mElement->SetAttribute(mAttribute, mValue);
00084   else
00085     result = mElement->RemoveAttribute(mAttribute);
00086 
00087   return result;
00088 }
00089 
00090 NS_IMETHODIMP ChangeAttributeTxn::UndoTransaction(void)
00091 {
00092   NS_ASSERTION(mEditor && mElement, "bad state");
00093   if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
00094 
00095   nsresult result;
00096   if (mAttributeWasSet)
00097     result = mElement->SetAttribute(mAttribute, mUndoValue);
00098   else
00099     result = mElement->RemoveAttribute(mAttribute);
00100 
00101   return result;
00102 }
00103 
00104 NS_IMETHODIMP ChangeAttributeTxn::RedoTransaction(void)
00105 {
00106   NS_ASSERTION(mEditor && mElement, "bad state");
00107   if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
00108 
00109   nsresult result;
00110   if (!mRemoveAttribute)
00111     result = mElement->SetAttribute(mAttribute, mValue);
00112   else
00113     result = mElement->RemoveAttribute(mAttribute);
00114 
00115   return result;
00116 }
00117 
00118 NS_IMETHODIMP ChangeAttributeTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
00119 {
00120   if (aDidMerge)
00121     *aDidMerge=PR_FALSE;
00122   return NS_OK;
00123 }
00124 
00125 NS_IMETHODIMP ChangeAttributeTxn::GetTxnDescription(nsAString& aString)
00126 {
00127   aString.AssignLiteral("ChangeAttributeTxn: [mRemoveAttribute == ");
00128 
00129   if (!mRemoveAttribute)
00130     aString.AppendLiteral("false] ");
00131   else
00132     aString.AppendLiteral("true] ");
00133   aString += mAttribute;
00134   return NS_OK;
00135 }