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
|
/* 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 "ScrollPositionUpdate.h"
#include <ostream>
#include "mozilla/Assertions.h"
namespace mozilla {
static ScrollGenerationCounter sGenerationCounter;
ScrollPositionUpdate::ScrollPositionUpdate()
: mType(ScrollUpdateType::Absolute),
mScrollMode(ScrollMode::Normal),
mScrollOrigin(ScrollOrigin::None),
mTriggeredByScript(ScrollTriggeredByScript::No) {}
/*static*/
ScrollPositionUpdate ScrollPositionUpdate::NewScrollframe(
nsPoint aInitialPosition) {
ScrollPositionUpdate ret;
ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
ret.mScrollMode = ScrollMode::Instant;
ret.mDestination = CSSPoint::FromAppUnits(aInitialPosition);
return ret;
}
/*static*/
ScrollPositionUpdate ScrollPositionUpdate::NewScroll(ScrollOrigin aOrigin,
nsPoint aDestination) {
MOZ_ASSERT(aOrigin != ScrollOrigin::NotSpecified);
MOZ_ASSERT(aOrigin != ScrollOrigin::None);
ScrollPositionUpdate ret;
ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
ret.mType = ScrollUpdateType::Absolute;
ret.mScrollMode = ScrollMode::Instant;
ret.mScrollOrigin = aOrigin;
ret.mDestination = CSSPoint::FromAppUnits(aDestination);
return ret;
}
/*static*/
ScrollPositionUpdate ScrollPositionUpdate::NewRelativeScroll(
nsPoint aSource, nsPoint aDestination) {
ScrollPositionUpdate ret;
ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
ret.mType = ScrollUpdateType::Relative;
ret.mScrollMode = ScrollMode::Instant;
ret.mScrollOrigin = ScrollOrigin::Relative;
ret.mDestination = CSSPoint::FromAppUnits(aDestination);
ret.mSource = CSSPoint::FromAppUnits(aSource);
return ret;
}
/*static*/
ScrollPositionUpdate ScrollPositionUpdate::NewSmoothScroll(
ScrollMode aMode, ScrollOrigin aOrigin, nsPoint aDestination,
ScrollTriggeredByScript aTriggeredByScript,
UniquePtr<ScrollSnapTargetIds> aSnapTargetIds) {
MOZ_ASSERT(aOrigin != ScrollOrigin::NotSpecified);
MOZ_ASSERT(aOrigin != ScrollOrigin::None);
MOZ_ASSERT(aMode == ScrollMode::Smooth || aMode == ScrollMode::SmoothMsd);
ScrollPositionUpdate ret;
ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
ret.mType = ScrollUpdateType::Absolute;
ret.mScrollMode = aMode;
ret.mScrollOrigin = aOrigin;
ret.mDestination = CSSPoint::FromAppUnits(aDestination);
ret.mTriggeredByScript = aTriggeredByScript;
if (aSnapTargetIds) {
ret.mSnapTargetIds = *aSnapTargetIds;
}
return ret;
}
/*static*/
ScrollPositionUpdate ScrollPositionUpdate::NewPureRelativeScroll(
ScrollOrigin aOrigin, ScrollMode aMode, const nsPoint& aDelta) {
MOZ_ASSERT(aOrigin != ScrollOrigin::NotSpecified);
MOZ_ASSERT(aOrigin != ScrollOrigin::None);
ScrollPositionUpdate ret;
ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
ret.mType = ScrollUpdateType::PureRelative;
ret.mScrollMode = aMode;
ret.mScrollOrigin = aOrigin;
ret.mDelta = CSSPoint::FromAppUnits(aDelta);
return ret;
}
bool ScrollPositionUpdate::operator==(
const ScrollPositionUpdate& aOther) const {
// instances are immutable, and all the fields are set when the generation
// is set. So if the generation matches, these instances are identical.
return mScrollGeneration == aOther.mScrollGeneration;
}
MainThreadScrollGeneration ScrollPositionUpdate::GetGeneration() const {
return mScrollGeneration;
}
ScrollUpdateType ScrollPositionUpdate::GetType() const { return mType; }
ScrollMode ScrollPositionUpdate::GetMode() const { return mScrollMode; }
ScrollOrigin ScrollPositionUpdate::GetOrigin() const { return mScrollOrigin; }
CSSPoint ScrollPositionUpdate::GetDestination() const {
MOZ_ASSERT(mType == ScrollUpdateType::Absolute ||
mType == ScrollUpdateType::Relative);
return mDestination;
}
CSSPoint ScrollPositionUpdate::GetSource() const {
MOZ_ASSERT(mType == ScrollUpdateType::Relative);
return mSource;
}
CSSPoint ScrollPositionUpdate::GetDelta() const {
MOZ_ASSERT(mType == ScrollUpdateType::PureRelative);
return mDelta;
}
std::ostream& operator<<(std::ostream& aStream,
const ScrollPositionUpdate& aUpdate) {
aStream << "{ gen=" << aUpdate.mScrollGeneration << ", type=" << aUpdate.mType
<< ", mode=" << aUpdate.mScrollMode
<< ", origin=" << aUpdate.mScrollOrigin
<< ", dst=" << aUpdate.mDestination << ", src=" << aUpdate.mSource
<< ", delta=" << aUpdate.mDelta
<< ", triggered by script=" << aUpdate.WasTriggeredByScript() << " }";
return aStream;
}
} // namespace mozilla
|
