/* -*- 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 "mozilla/dom/DragEvent.h"

#include "mozilla/dom/MouseEventBinding.h"

#include "mozilla/MouseEvents.h"

#include "nsContentUtils.h"

#include "prtime.h"

namespace mozilla {

namespace dom {

DragEvent::DragEvent(EventTarget* aOwner,

                     nsPresContext* aPresContext,

                     WidgetDragEvent* aEvent)

  : MouseEvent(aOwner, aPresContext,

               aEvent ? aEvent :

                        new WidgetDragEvent(false, eVoidEvent, nullptr))

{

  if (aEvent) {

    mEventIsInternal = false;

  }

  else {

    mEventIsInternal = true;

    mEvent->mTime = PR_Now();

    mEvent->mRefPoint = LayoutDeviceIntPoint(0, 0);

    mEvent->AsMouseEvent()->inputSource = MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;

  }

}

void

DragEvent::InitDragEvent(const nsAString& aType,

                         bool aCanBubble,

                         bool aCancelable,

                         nsGlobalWindowInner* aView,

                         int32_t aDetail,

                         int32_t aScreenX,

                         int32_t aScreenY,

                         int32_t aClientX,

                         int32_t aClientY,

                         bool aCtrlKey,

                         bool aAltKey,

                         bool aShiftKey,

                         bool aMetaKey,

                         uint16_t aButton,

                         EventTarget* aRelatedTarget,

                         DataTransfer* aDataTransfer)

{

  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);

  MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable,

                             aView, aDetail, aScreenX, aScreenY,

                             aClientX, aClientY, aCtrlKey, aAltKey,

                             aShiftKey, aMetaKey, aButton, aRelatedTarget);

  if (mEventIsInternal) {

    mEvent->AsDragEvent()->mDataTransfer = aDataTransfer;

  }

}

DataTransfer*

DragEvent::GetDataTransfer()

{

  // the dataTransfer field of the event caches the DataTransfer associated

  // with the drag. It is initialized when an attempt is made to retrieve it

  // rather that when the event is created to avoid duplicating the data when

  // no listener ever uses it.

  if (!mEvent || mEvent->mClass != eDragEventClass) {

    NS_WARNING("Tried to get dataTransfer from non-drag event!");

    return nullptr;

  }

  WidgetDragEvent* dragEvent = mEvent->AsDragEvent();

  // for synthetic events, just use the supplied data transfer object even if null

  if (!mEventIsInternal) {

    nsresult rv = nsContentUtils::SetDataTransferInEvent(dragEvent);

    NS_ENSURE_SUCCESS(rv, nullptr);

  }

  return dragEvent->mDataTransfer;

}

// static

already_AddRefed<DragEvent>

DragEvent::Constructor(const GlobalObject& aGlobal,

                       const nsAString& aType,

                       const DragEventInit& aParam,

                       ErrorResult& aRv)

{

  nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());

  RefPtr<DragEvent> e = new DragEvent(t, nullptr, nullptr);

  bool trusted = e->Init(t);

  e->InitDragEvent(aType, aParam.mBubbles, aParam.mCancelable,

                   aParam.mView, aParam.mDetail, aParam.mScreenX,

                   aParam.mScreenY, aParam.mClientX, aParam.mClientY,

                   aParam.mCtrlKey, aParam.mAltKey, aParam.mShiftKey,

                   aParam.mMetaKey, aParam.mButton, aParam.mRelatedTarget,

                   aParam.mDataTransfer);

  e->InitializeExtraMouseEventDictionaryMembers(aParam);

  e->SetTrusted(trusted);

  e->SetComposed(aParam.mComposed);

  return e.forget();

}

} // namespace dom

} // namespace mozilla

using namespace mozilla;

using namespace mozilla::dom;

already_AddRefed<DragEvent>

NS_NewDOMDragEvent(EventTarget* aOwner,

                   nsPresContext* aPresContext,

                   WidgetDragEvent* aEvent)

{

  RefPtr<DragEvent> event =

    new DragEvent(aOwner, aPresContext, aEvent);

  return event.forget();

}