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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ChangeAttributeTransaction.h"
#include "mozilla/dom/Element.h" // for Element
#include "nsAString.h"
#include "nsError.h" // for NS_ERROR_NOT_INITIALIZED, etc.
namespace mozilla {
using namespace dom;
ChangeAttributeTransaction::ChangeAttributeTransaction(Element& aElement,
nsIAtom& aAttribute,
const nsAString* aValue)
: EditTransactionBase()
, mElement(&aElement)
, mAttribute(&aAttribute)
, mValue(aValue ? *aValue : EmptyString())
, mRemoveAttribute(!aValue)
, mAttributeWasSet(false)
, mUndoValue()
{
}
ChangeAttributeTransaction::~ChangeAttributeTransaction()
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(ChangeAttributeTransaction,
EditTransactionBase,
mElement)
NS_IMPL_ADDREF_INHERITED(ChangeAttributeTransaction, EditTransactionBase)
NS_IMPL_RELEASE_INHERITED(ChangeAttributeTransaction, EditTransactionBase)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ChangeAttributeTransaction)
NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
NS_IMETHODIMP
ChangeAttributeTransaction::DoTransaction()
{
// Need to get the current value of the attribute and save it, and set
// mAttributeWasSet
mAttributeWasSet = mElement->GetAttr(kNameSpaceID_None, mAttribute,
mUndoValue);
// XXX: hack until attribute-was-set code is implemented
if (!mUndoValue.IsEmpty()) {
mAttributeWasSet = true;
}
// XXX: end hack
// Now set the attribute to the new value
if (mRemoveAttribute) {
return mElement->UnsetAttr(kNameSpaceID_None, mAttribute, true);
}
return mElement->SetAttr(kNameSpaceID_None, mAttribute, mValue, true);
}
NS_IMETHODIMP
ChangeAttributeTransaction::UndoTransaction()
{
if (mAttributeWasSet) {
return mElement->SetAttr(kNameSpaceID_None, mAttribute, mUndoValue, true);
}
return mElement->UnsetAttr(kNameSpaceID_None, mAttribute, true);
}
NS_IMETHODIMP
ChangeAttributeTransaction::RedoTransaction()
{
if (mRemoveAttribute) {
return mElement->UnsetAttr(kNameSpaceID_None, mAttribute, true);
}
return mElement->SetAttr(kNameSpaceID_None, mAttribute, mValue, true);
}
NS_IMETHODIMP
ChangeAttributeTransaction::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("ChangeAttributeTransaction: [mRemoveAttribute == ");
if (mRemoveAttribute) {
aString.AppendLiteral("true] ");
} else {
aString.AppendLiteral("false] ");
}
aString += nsDependentAtomString(mAttribute);
return NS_OK;
}
} // namespace mozilla
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