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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/* -*- 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 "mozilla/StaticPrefs_dom.h"
#include "prtime.h"
namespace mozilla::dom {
WheelEvent::WheelEvent(EventTarget* aOwner, nsPresContext* aPresContext,
WidgetWheelEvent* aWheelEvent)
: MouseEvent(aOwner, aPresContext,
aWheelEvent
? aWheelEvent
: new WidgetWheelEvent(false, eVoidEvent, nullptr)),
mAppUnitsPerDevPixel(0) {
if (StaticPrefs::dom_event_wheel_deltaMode_lines_always_disabled()) {
mDeltaModeCheckingState = DeltaModeCheckingState::Unchecked;
}
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()->mInputSource =
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::ToWebExposedDelta(const WidgetWheelEvent& aWidgetEvent,
double aDelta, CallerType aCallerType) {
if (aCallerType != CallerType::System) {
if (mDeltaModeCheckingState == DeltaModeCheckingState::Unknown) {
mDeltaModeCheckingState = DeltaModeCheckingState::Unchecked;
}
if (mDeltaModeCheckingState == DeltaModeCheckingState::Unchecked &&
aWidgetEvent.mDeltaMode == WheelEvent_Binding::DOM_DELTA_LINE &&
StaticPrefs::dom_event_wheel_deltaMode_lines_disabled()) {
// TODO(emilio, bug 1675949): Consider not using a fixed multiplier here?
return aDelta *
StaticPrefs::dom_event_wheel_deltaMode_lines_to_pixel_scale();
}
}
if (!mAppUnitsPerDevPixel) {
return aDelta;
}
return aDelta * mAppUnitsPerDevPixel / AppUnitsPerCSSPixel();
}
double WheelEvent::DeltaX(CallerType aCallerType) {
WidgetWheelEvent* ev = mEvent->AsWheelEvent();
return ToWebExposedDelta(*ev, ev->mDeltaX, aCallerType);
}
double WheelEvent::DeltaY(CallerType aCallerType) {
WidgetWheelEvent* ev = mEvent->AsWheelEvent();
return ToWebExposedDelta(*ev, ev->mDeltaY, aCallerType);
}
double WheelEvent::DeltaZ(CallerType aCallerType) {
WidgetWheelEvent* ev = mEvent->AsWheelEvent();
return ToWebExposedDelta(*ev, ev->mDeltaZ, aCallerType);
}
uint32_t WheelEvent::DeltaMode(CallerType aCallerType) {
uint32_t mode = mEvent->AsWheelEvent()->mDeltaMode;
if (aCallerType != CallerType::System) {
if (mDeltaModeCheckingState == DeltaModeCheckingState::Unknown) {
mDeltaModeCheckingState = DeltaModeCheckingState::Checked;
} else if (mDeltaModeCheckingState == DeltaModeCheckingState::Unchecked &&
mode == WheelEvent_Binding::DOM_DELTA_LINE &&
StaticPrefs::dom_event_wheel_deltaMode_lines_disabled()) {
return WheelEvent_Binding::DOM_DELTA_PIXEL;
}
}
return mode;
}
already_AddRefed<WheelEvent> WheelEvent::Constructor(
const GlobalObject& aGlobal, const nsAString& aType,
const WheelEventInit& aParam) {
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, u""_ns, aParam.mDeltaX,
aParam.mDeltaY, aParam.mDeltaZ, aParam.mDeltaMode);
e->InitializeExtraMouseEventDictionaryMembers(aParam);
e->SetTrusted(trusted);
e->SetComposed(aParam.mComposed);
return e.forget();
}
} // namespace mozilla::dom
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();
}
|
