/* -*- 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/. */

#ifndef mozilla_dom_WheelEvent_h_

#define mozilla_dom_WheelEvent_h_

#include "mozilla/dom/MouseEvent.h"

#include "mozilla/dom/WheelEventBinding.h"

#include "mozilla/EventForwards.h"

namespace mozilla {

namespace dom {

class WheelEvent : public MouseEvent

{

public:

  WheelEvent(EventTarget* aOwner,

             nsPresContext* aPresContext,

             WidgetWheelEvent* aWheelEvent);

  NS_INLINE_DECL_REFCOUNTING_INHERITED(WheelEvent, MouseEvent)

  static

  already_AddRefed<WheelEvent> Constructor(const GlobalObject& aGlobal,

                                           const nsAString& aType,

                                           const WheelEventInit& aParam,

                                           ErrorResult& aRv);

  virtual JSObject* WrapObjectInternal(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override

  {

    return WheelEvent_Binding::Wrap(aCx, this, aGivenProto);

  }

  // NOTE: DeltaX(), DeltaY() and DeltaZ() return CSS pixels when deltaMode is

  //       DOM_DELTA_PIXEL. (The internal event's delta values are device pixels

  //       if it's dispatched by widget)

  double DeltaX();

  double DeltaY();

  double DeltaZ();

  uint32_t DeltaMode();

  void

  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);

protected:

  ~WheelEvent() {}

private:

  int32_t mAppUnitsPerDevPixel;

};

} // namespace dom

} // namespace mozilla

already_AddRefed<mozilla::dom::WheelEvent>

NS_NewDOMWheelEvent(mozilla::dom::EventTarget* aOwner,

                    nsPresContext* aPresContext,

                    mozilla::WidgetWheelEvent* aEvent);

#endif // mozilla_dom_WheelEvent_h_