gecko-dev/dom/events/ScrollAreaEvent.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "base/basictypes.h"
#include "ipc/IPCMessageUtils.h"
#include "mozilla/dom/DOMRect.h"
#include "mozilla/dom/ScrollAreaEvent.h"
#include "mozilla/ContentEvents.h"

namespace mozilla {
namespace dom {

ScrollAreaEvent::ScrollAreaEvent(EventTarget* aOwner,
                                 nsPresContext* aPresContext,
                                 InternalScrollAreaEvent* aEvent)
  : UIEvent(aOwner, aPresContext, aEvent)
  , mClientArea(new DOMRect(nullptr))
{
  mClientArea->SetLayoutRect(aEvent ? aEvent->mArea : nsRect());
}

NS_IMPL_CYCLE_COLLECTION_INHERITED(ScrollAreaEvent, UIEvent,
                                   mClientArea)

NS_IMPL_ADDREF_INHERITED(ScrollAreaEvent, UIEvent)
NS_IMPL_RELEASE_INHERITED(ScrollAreaEvent, UIEvent)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ScrollAreaEvent)
NS_INTERFACE_MAP_END_INHERITING(UIEvent)

void
ScrollAreaEvent::InitScrollAreaEvent(const nsAString& aEventType,
                                     bool aCanBubble,
                                     bool aCancelable,
                                     nsGlobalWindow* aView,
                                     int32_t aDetail,
                                     float aX,
                                     float aY,
                                     float aWidth,
                                     float aHeight)
{
  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);

  UIEvent::InitUIEvent(aEventType, aCanBubble, aCancelable, aView, aDetail);
  mClientArea->SetRect(aX, aY, aWidth, aHeight);
}

NS_IMETHODIMP_(void)
ScrollAreaEvent::Serialize(IPC::Message* aMsg,
                           bool aSerializeInterfaceType)
{
  if (aSerializeInterfaceType) {
    IPC::WriteParam(aMsg, NS_LITERAL_STRING("scrollareaevent"));
  }

  Event::Serialize(aMsg, false);

  IPC::WriteParam(aMsg, X());
  IPC::WriteParam(aMsg, Y());
  IPC::WriteParam(aMsg, Width());
  IPC::WriteParam(aMsg, Height());
}

NS_IMETHODIMP_(bool)
ScrollAreaEvent::Deserialize(const IPC::Message* aMsg, PickleIterator* aIter)
{
  NS_ENSURE_TRUE(Event::Deserialize(aMsg, aIter), false);

  float x, y, width, height;
  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &x), false);
  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &y), false);
  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &width), false);
  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &height), false);
  mClientArea->SetRect(x, y, width, height);

  return true;
}

} // namespace dom
} // namespace mozilla

using namespace mozilla;
using namespace mozilla::dom;

already_AddRefed<ScrollAreaEvent>
NS_NewDOMScrollAreaEvent(EventTarget* aOwner,
                         nsPresContext* aPresContext,
                         InternalScrollAreaEvent* aEvent)
{
  RefPtr<ScrollAreaEvent> ev =
    new ScrollAreaEvent(aOwner, aPresContext, aEvent);
  return ev.forget();
}