dom/events/WheelEvent.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_dom_WheelEvent_h_
   8 #define mozilla_dom_WheelEvent_h_
   9
  10 #include "nsIDOMWheelEvent.h"
  11 #include "mozilla/dom/MouseEvent.h"
  12 #include "mozilla/dom/WheelEventBinding.h"
  13 #include "mozilla/EventForwards.h"
  14
  15 namespace mozilla {
  16 namespace dom {
  17
  18 class WheelEvent : public MouseEvent,
  19                    public nsIDOMWheelEvent
  20 {
  21 public:
  22   WheelEvent(EventTarget* aOwner,
  23              nsPresContext* aPresContext,
  24              WidgetWheelEvent* aWheelEvent);
  25
  26   NS_DECL_ISUPPORTS_INHERITED
  27
  28   // nsIDOMWheelEvent Interface
  29   NS_DECL_NSIDOMWHEELEVENT
  30
  31   // Forward to base class
  32   NS_FORWARD_TO_MOUSEEVENT
  33
  34   static
  35   already_AddRefed<WheelEvent> Constructor(const GlobalObject& aGlobal,
  36                                            const nsAString& aType,
  37                                            const WheelEventInit& aParam,
  38                                            ErrorResult& aRv);
  39
  40   virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE
  41   {
  42     return WheelEventBinding::Wrap(aCx, this);
  43   }
  44
  45   // NOTE: DeltaX(), DeltaY() and DeltaZ() return CSS pixels when deltaMode is
  46   //       DOM_DELTA_PIXEL. (The internal event's delta values are device pixels
  47   //       if it's dispatched by widget)
  48   double DeltaX();
  49   double DeltaY();
  50   double DeltaZ();
  51   uint32_t DeltaMode();
  52
  53 protected:
  54   ~WheelEvent() {}
  55
  56 private:
  57   int32_t mAppUnitsPerDevPixel;
  58 };
  59
  60 } // namespace dom
  61 } // namespace mozilla
  62
  63 #endif // mozilla_dom_WheelEvent_h_