/* -*- 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/MouseEventBinding.h"

#include "mozilla/dom/WheelEvent.h"

#include "mozilla/MouseEvents.h"

#include "prtime.h"

namespace mozilla {

namespace dom {

WheelEvent::WheelEvent(EventTarget* aOwner,

                       nsPresContext* aPresContext,

                       WidgetWheelEvent* aWheelEvent)

  : MouseEvent(aOwner, aPresContext,

               aWheelEvent ? aWheelEvent :

                             new WidgetWheelEvent(false, eVoidEvent, nullptr))

  , mAppUnitsPerDevPixel(0)

{

  if (aWheelEvent) {

    mEventIsInternal = false;

    // If the delta mode is pixel, the WidgetWheelEvent's delta values are in

    // device pixels.  However, JS contents need the delta values in CSS pixels.

    // We should store the value of mAppUnitsPerDevPixel here because

    // it might be changed by changing zoom or something.

    if (aWheelEvent->mDeltaMode == WheelEvent_Binding::DOM_DELTA_PIXEL) {

      mAppUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();

    }

  } else {

    mEventIsInternal = true;

    mEvent->mTime = PR_Now();

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

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

  }

}

void

WheelEvent::InitWheelEvent(const nsAString& aType,

                           bool aCanBubble,

                           bool aCancelable,

                           nsGlobalWindowInner* aView,

                           int32_t aDetail,

                           int32_t aScreenX,

                           int32_t aScreenY,

                           int32_t aClientX,

                           int32_t aClientY,

                           uint16_t aButton,

                           EventTarget* aRelatedTarget,

                           const nsAString& aModifiersList,

                           double aDeltaX,

                           double aDeltaY,

                           double aDeltaZ,

                           uint32_t aDeltaMode)

{

  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);

  MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable, aView, aDetail,

                             aScreenX, aScreenY, aClientX, aClientY, aButton,

                             aRelatedTarget, aModifiersList);

  WidgetWheelEvent* wheelEvent = mEvent->AsWheelEvent();

  wheelEvent->mDeltaX = aDeltaX;

  wheelEvent->mDeltaY = aDeltaY;

  wheelEvent->mDeltaZ = aDeltaZ;

  wheelEvent->mDeltaMode = aDeltaMode;

}

double

WheelEvent::DeltaX()

{

  if (!mAppUnitsPerDevPixel) {

    return mEvent->AsWheelEvent()->mDeltaX;

  }

  return mEvent->AsWheelEvent()->mDeltaX *

    mAppUnitsPerDevPixel / AppUnitsPerCSSPixel();

}

double

WheelEvent::DeltaY()

{

  if (!mAppUnitsPerDevPixel) {

    return mEvent->AsWheelEvent()->mDeltaY;

  }

  return mEvent->AsWheelEvent()->mDeltaY *

    mAppUnitsPerDevPixel / AppUnitsPerCSSPixel();

}

double

WheelEvent::DeltaZ()

{

  if (!mAppUnitsPerDevPixel) {

    return mEvent->AsWheelEvent()->mDeltaZ;

  }

  return mEvent->AsWheelEvent()->mDeltaZ *

    mAppUnitsPerDevPixel / AppUnitsPerCSSPixel();

}

uint32_t

WheelEvent::DeltaMode()

{

  return mEvent->AsWheelEvent()->mDeltaMode;

}

already_AddRefed<WheelEvent>

WheelEvent::Constructor(const GlobalObject& aGlobal,

                        const nsAString& aType,

                        const WheelEventInit& aParam,

                        ErrorResult& aRv)

{

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

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

  bool trusted = e->Init(t);

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

                    aParam.mView, aParam.mDetail,

                    aParam.mScreenX, aParam.mScreenY,

                    aParam.mClientX, aParam.mClientY,

                    aParam.mButton, aParam.mRelatedTarget,

                    EmptyString(), aParam.mDeltaX,

                    aParam.mDeltaY, aParam.mDeltaZ, aParam.mDeltaMode);

  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<WheelEvent>

NS_NewDOMWheelEvent(EventTarget* aOwner,

                    nsPresContext* aPresContext,

                    WidgetWheelEvent* aEvent)

{

  RefPtr<WheelEvent> it = new WheelEvent(aOwner, aPresContext, aEvent);

  return it.forget();

}