gecko/editor/libeditor/base/ChangeAttributeTxn.cpp

112 lines
3.4 KiB
C++

/* -*- 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 "ChangeAttributeTxn.h"
#include "nsAString.h"
#include "nsDebug.h" // for NS_ASSERTION
#include "nsError.h" // for NS_ERROR_NOT_INITIALIZED, etc
#include "nsEditor.h" // for nsEditor
#include "nsString.h" // for nsString
#include "mozilla/dom/Element.h"
using namespace mozilla;
ChangeAttributeTxn::ChangeAttributeTxn()
: EditTxn()
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED_1(ChangeAttributeTxn, EditTxn,
mElement)
NS_IMPL_ADDREF_INHERITED(ChangeAttributeTxn, EditTxn)
NS_IMPL_RELEASE_INHERITED(ChangeAttributeTxn, EditTxn)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ChangeAttributeTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
NS_IMETHODIMP ChangeAttributeTxn::Init(nsEditor *aEditor,
dom::Element *aElement,
const nsAString& aAttribute,
const nsAString& aValue,
bool aRemoveAttribute)
{
NS_ASSERTION(aEditor && aElement, "bad arg");
if (!aEditor || !aElement) { return NS_ERROR_NULL_POINTER; }
mEditor = aEditor;
mElement = aElement;
mAttribute = aAttribute;
mValue = aValue;
mRemoveAttribute = aRemoveAttribute;
mAttributeWasSet=false;
mUndoValue.Truncate();
return NS_OK;
}
NS_IMETHODIMP ChangeAttributeTxn::DoTransaction(void)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(mElement);
// need to get the current value of the attribute and save it, and set mAttributeWasSet
nsresult result = mEditor->GetAttributeValue(element, mAttribute, mUndoValue, &mAttributeWasSet);
NS_ENSURE_SUCCESS(result, result);
// XXX: hack until attribute-was-set code is implemented
if (!mUndoValue.IsEmpty())
mAttributeWasSet = true;
// XXX: end hack
ErrorResult rv;
// now set the attribute to the new value
if (!mRemoveAttribute)
mElement->SetAttribute(mAttribute, mValue, rv);
else
mElement->RemoveAttribute(mAttribute, rv);
return rv.ErrorCode();
}
NS_IMETHODIMP ChangeAttributeTxn::UndoTransaction(void)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
ErrorResult rv;
if (mAttributeWasSet)
mElement->SetAttribute(mAttribute, mUndoValue, rv);
else
mElement->RemoveAttribute(mAttribute, rv);
return rv.ErrorCode();
}
NS_IMETHODIMP ChangeAttributeTxn::RedoTransaction(void)
{
NS_ASSERTION(mEditor && mElement, "bad state");
if (!mEditor || !mElement) { return NS_ERROR_NOT_INITIALIZED; }
ErrorResult rv;
if (!mRemoveAttribute)
mElement->SetAttribute(mAttribute, mValue, rv);
else
mElement->RemoveAttribute(mAttribute, rv);
return rv.ErrorCode();
}
NS_IMETHODIMP ChangeAttributeTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("ChangeAttributeTxn: [mRemoveAttribute == ");
if (!mRemoveAttribute)
aString.AppendLiteral("false] ");
else
aString.AppendLiteral("true] ");
aString += mAttribute;
return NS_OK;
}