1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=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 "mozilla/dom/MouseEvent.h"
11 #include "mozilla/dom/WheelEventBinding.h"
12 #include "mozilla/EventForwards.h"
13 
14 namespace mozilla {
15 namespace dom {
16 
17 class WheelEvent : public MouseEvent {
18  public:
19   WheelEvent(EventTarget* aOwner, nsPresContext* aPresContext,
20              WidgetWheelEvent* aWheelEvent);
21 
22   NS_INLINE_DECL_REFCOUNTING_INHERITED(WheelEvent, MouseEvent)
23 
24   static already_AddRefed<WheelEvent> Constructor(const GlobalObject& aGlobal,
25                                                   const nsAString& aType,
26                                                   const WheelEventInit& aParam);
27 
WrapObjectInternal(JSContext * aCx,JS::Handle<JSObject * > aGivenProto)28   virtual JSObject* WrapObjectInternal(
29       JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override {
30     return WheelEvent_Binding::Wrap(aCx, this, aGivenProto);
31   }
32 
33   // NOTE: DeltaX(), DeltaY() and DeltaZ() return CSS pixels when deltaMode is
34   //       DOM_DELTA_PIXEL. (The internal event's delta values are device pixels
35   //       if it's dispatched by widget)
36   double DeltaX();
37   double DeltaY();
38   double DeltaZ();
39   uint32_t DeltaMode();
40 
41   void InitWheelEvent(const nsAString& aType, bool aCanBubble, bool aCancelable,
42                       nsGlobalWindowInner* aView, int32_t aDetail,
43                       int32_t aScreenX, int32_t aScreenY, int32_t aClientX,
44                       int32_t aClientY, uint16_t aButton,
45                       EventTarget* aRelatedTarget,
46                       const nsAString& aModifiersList, double aDeltaX,
47                       double aDeltaY, double aDeltaZ, uint32_t aDeltaMode);
48 
49  protected:
50   ~WheelEvent() = default;
51 
52  private:
53   int32_t mAppUnitsPerDevPixel;
54 };
55 
56 }  // namespace dom
57 }  // namespace mozilla
58 
59 already_AddRefed<mozilla::dom::WheelEvent> NS_NewDOMWheelEvent(
60     mozilla::dom::EventTarget* aOwner, nsPresContext* aPresContext,
61     mozilla::WidgetWheelEvent* aEvent);
62 
63 #endif  // mozilla_dom_WheelEvent_h_
64