editor/libeditor/ChangeAttributeTransaction.cpp
author Kris Maglione <maglione.k@gmail.com>
Wed, 22 Mar 2017 20:33:05 -0700
changeset 428214 c90ba1cf0de266a399896f541bb9bfb08257a4ba
parent 344424 942dac3830549a98809abca0d62aeb7599c51631
child 435808 67a8e12324569dd730347187e2ffccae486c758b
permissions -rw-r--r--
Bug 1255894: Part 3 - Create skeleton IPDL framework for OOP stream filters. r=baku This interface will allow extensions running into a content process to attach a filtering stream listener to an HTTP request in the parent process. The content process attaches a listener by sending a message from the content process containing the ID of the request to filter, and the ID of the add-on making the request. The permissions and request mappings for this are handled by the web request service added in part 2. MozReview-Commit-ID: B7Dd3ywwCBX

/* -*- 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