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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/* -*- 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 nsSliderFrame_h__
#define nsSliderFrame_h__
#include "mozilla/Attributes.h"
#include "nsAtom.h"
#include "nsCOMPtr.h"
#include "nsContainerFrame.h"
#include "nsIDOMEventListener.h"
#include "nsITimer.h"
#include "nsRepeatService.h"
class nsITimer;
class nsScrollbarFrame;
class nsSliderFrame;
namespace mozilla {
class nsDisplaySliderMarks;
class PresShell;
class ScrollContainerFrame;
} // namespace mozilla
nsIFrame* NS_NewSliderFrame(mozilla::PresShell* aPresShell,
mozilla::ComputedStyle* aStyle);
class nsSliderMediator final : public nsIDOMEventListener {
public:
NS_DECL_ISUPPORTS
nsSliderFrame* mSlider;
explicit nsSliderMediator(nsSliderFrame* aSlider) { mSlider = aSlider; }
void SetSlider(nsSliderFrame* aSlider) { mSlider = aSlider; }
NS_DECL_NSIDOMEVENTLISTENER
protected:
virtual ~nsSliderMediator() = default;
};
class nsSliderFrame final : public nsContainerFrame {
public:
NS_DECL_FRAMEARENA_HELPERS(nsSliderFrame)
NS_DECL_QUERYFRAME
friend class nsSliderMediator;
friend class mozilla::nsDisplaySliderMarks;
explicit nsSliderFrame(ComputedStyle* aStyle, nsPresContext* aPresContext);
virtual ~nsSliderFrame();
// Get the point associated with this event. Returns true if a single valid
// point was found. Otherwise false.
bool GetEventPoint(mozilla::WidgetGUIEvent* aEvent, nsPoint& aPoint);
// Gets the event coordinates relative to the widget associated with this
// frame. Return true if a single valid point was found.
bool GetEventPoint(mozilla::WidgetGUIEvent* aEvent,
mozilla::LayoutDeviceIntPoint& aPoint);
#ifdef DEBUG_FRAME_DUMP
nsresult GetFrameName(nsAString& aResult) const override {
return MakeFrameName(u"SliderFrame"_ns, aResult);
}
#endif
void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
// nsIFrame overrides
void Destroy(DestroyContext&) override;
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) override;
void BuildDisplayListForThumb(nsDisplayListBuilder* aBuilder,
nsIFrame* aThumb,
const nsDisplayListSet& aLists);
void Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
nsresult HandleEvent(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) override;
// nsContainerFrame overrides
void SetInitialChildList(ChildListID aListID,
nsFrameList&& aChildList) override;
void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
const nsLineList::iterator* aPrevFrameLine,
nsFrameList&& aFrameList) override;
void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override;
nsresult StartDrag(mozilla::dom::Event* aEvent);
nsresult StopDrag();
void StartAPZDrag(mozilla::WidgetGUIEvent* aEvent);
NS_IMETHOD HandlePress(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) override;
NS_IMETHOD HandleMultiplePress(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus,
bool aControlHeld) override {
return NS_OK;
}
MOZ_CAN_RUN_SCRIPT
NS_IMETHOD HandleDrag(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) override {
return NS_OK;
}
NS_IMETHOD HandleRelease(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) override;
// Return the ratio the scrollbar thumb should move in proportion to the
// scrolled frame.
float GetThumbRatio() const;
// Notify the slider frame that an async scrollbar drag was started on the
// APZ side without consulting the main thread. The block id is the APZ
// input block id of the mousedown that started the drag.
void AsyncScrollbarDragInitiated(uint64_t aDragBlockId);
// Notify the slider frame that an async scrollbar drag requested in
// StartAPZDrag() was rejected by APZ, and the slider frame should
// fall back to main-thread dragging.
void AsyncScrollbarDragRejected();
bool OnlySystemGroupDispatch(mozilla::EventMessage aMessage) const override;
// Returns the associated scroll container frame that contains this slider if
// any.
mozilla::ScrollContainerFrame* GetScrollContainerFrame();
void CurrentPositionChanged();
private:
bool GetScrollToClick();
nsScrollbarFrame* Scrollbar() const;
bool ShouldScrollForEvent(mozilla::WidgetGUIEvent* aEvent);
bool ShouldScrollToClickForEvent(mozilla::WidgetGUIEvent* aEvent);
bool IsEventOverThumb(mozilla::WidgetGUIEvent* aEvent);
void SetCurrentThumbPosition(nscoord aNewPos);
void DragThumb(bool aGrabMouseEvents);
void AddListener();
void RemoveListener();
bool IsDraggingThumb() const;
void SuppressDisplayport();
void UnsuppressDisplayport();
void StartRepeat() {
nsRepeatService::GetInstance()->Start(Notify, this, mContent->OwnerDoc(),
"nsSliderFrame"_ns);
}
void StopRepeat() {
nsRepeatService::GetInstance()->Stop(Notify, this);
mCurrentClickHoldDestination = Nothing();
}
void Notify();
static void Notify(void* aData) {
(static_cast<nsSliderFrame*>(aData))->Notify();
}
void PageScroll(bool aClickAndHold);
void SetupDrag(mozilla::WidgetGUIEvent* aEvent, nsIFrame* aThumbFrame,
nscoord aPos, bool aIsHorizontal);
nsPoint mDestinationPoint;
// If we are in a scrollbar track click-and-hold, this is populated with
// the destination of the scroll started at the most recent tick of the
// repeat timer.
Maybe<nsPoint> mCurrentClickHoldDestination;
RefPtr<nsSliderMediator> mMediator;
float mRatio;
nscoord mDragStart;
nscoord mThumbStart;
nscoord mRepeatDirection;
bool mDragInProgress = false;
// true if we've handed off the scrolling to APZ. This means that we should
// ignore scrolling events as the position will be updated by APZ. If we were
// to process these events then the scroll position update would conflict
// causing the scroll position to jump.
bool mScrollingWithAPZ;
// true if displayport suppression is active, for more performant
// scrollbar-dragging behaviour.
bool mSuppressionActive;
// If APZ initiated a scrollbar drag without main-thread involvement, it
// notifies us and this variable stores the input block id of the APZ input
// block that started the drag. This lets us handle the corresponding
// mousedown event properly, if it arrives after the scroll position has
// been shifted due to async scrollbar drag.
Maybe<uint64_t> mAPZDragInitiated;
nscoord mThumbMinLength;
static bool gMiddlePref;
}; // class nsSliderFrame
#endif
|
