1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/* -*- 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);
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(CallerType);
double DeltaY(CallerType);
double DeltaZ(CallerType);
uint32_t DeltaMode(CallerType);
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() = default;
double ToWebExposedDelta(const WidgetWheelEvent&, double aDelta, CallerType);
private:
int32_t mAppUnitsPerDevPixel;
enum class DeltaModeCheckingState : uint8_t {
// Neither deltaMode nor the delta values have been accessed.
Unknown,
// The delta values have been accessed, without checking deltaMode first.
Unchecked,
// The deltaMode has been checked.
Checked,
};
// For compat reasons, we might expose a DOM_DELTA_LINE event as
// DOM_DELTA_PIXEL instead. Whether we do that depends on whether the event
// has been asked for the deltaMode before the deltas. If it has, we assume
// that the page will correctly handle DOM_DELTA_LINE. This variable tracks
// that state. See bug 1392460.
DeltaModeCheckingState mDeltaModeCheckingState =
DeltaModeCheckingState::Unknown;
};
} // 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_
|
