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
|
/*
* Copyright (C) 2017 Igalia S.L.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "TouchGestureController.h"
#if USE(LIBWPE) && ENABLE(TOUCH_EVENTS)
#include <WebCore/Scrollbar.h>
namespace WebKit {
// FIXME: These ought to be either configurable or derived from system
// properties, such as screen size and pixel density.
static constexpr uint32_t scrollCaptureThreshold { 200 };
static constexpr uint32_t axisLockMovementThreshold { 8 };
static constexpr uint32_t axisLockActivationThreshold { 15 };
static constexpr uint32_t axisLockReleaseThreshold { 30 };
static constexpr uint32_t contextMenuThreshold { 500 };
TouchGestureController::EventVariant TouchGestureController::handleEvent(const struct wpe_input_touch_event_raw* touchPoint)
{
switch (touchPoint->type) {
case wpe_input_touch_event_type_down:
// Start of the touch interaction, first possible event is a mouse click.
m_gesturedEvent = GesturedEvent::Click;
m_start = { true, touchPoint->time, touchPoint->x, touchPoint->y };
m_offset = { touchPoint->x, touchPoint->y };
m_xAxisLockBroken = m_yAxisLockBroken = false;
break;
case wpe_input_touch_event_type_motion:
{
switch (m_gesturedEvent) {
case GesturedEvent::None:
break;
case GesturedEvent::Click:
{
// If currently only gesturing a click, determine if the touch has progressed
// so far that it should become a scrolling gesture.
int32_t deltaX = touchPoint->x - m_start.x;
int32_t deltaY = touchPoint->y - m_start.y;
uint32_t deltaTime = touchPoint->time - m_start.time;
int pixelsPerLineStep = WebCore::Scrollbar::pixelsPerLineStep();
bool overThreshold = std::abs(deltaX) >= pixelsPerLineStep
|| std::abs(deltaY) >= pixelsPerLineStep
|| deltaTime >= scrollCaptureThreshold;
if (!overThreshold)
break;
// Over threshold, bump the gestured event and directly fall through to handling it.
m_gesturedEvent = GesturedEvent::Axis;
FALLTHROUGH;
}
case GesturedEvent::ContextMenu:
break;
case GesturedEvent::Axis:
{
AxisEvent generatedEvent;
generatedEvent.phase = WebWheelEvent::Phase::PhaseChanged;
#if WPE_CHECK_VERSION(1, 5, 0)
generatedEvent.event.base = {
static_cast<enum wpe_input_axis_event_type>(wpe_input_axis_event_type_mask_2d | wpe_input_axis_event_type_motion_smooth),
touchPoint->time, m_start.x, m_start.y,
0, 0, 0,
};
uint32_t xOffset = std::abs(touchPoint->x - m_start.x);
uint32_t yOffset = std::abs(touchPoint->y - m_start.y);
if (xOffset >= axisLockReleaseThreshold)
m_xAxisLockBroken = true;
if (yOffset >= axisLockReleaseThreshold)
m_yAxisLockBroken = true;
if (xOffset >= axisLockMovementThreshold && yOffset >= axisLockMovementThreshold && xOffset < axisLockActivationThreshold && yOffset < axisLockActivationThreshold) {
m_xAxisLockBroken = true;
m_yAxisLockBroken = true;
}
generatedEvent.event.x_axis = (m_xAxisLockBroken || yOffset < axisLockActivationThreshold) ? -(m_offset.x - touchPoint->x) : 0;
generatedEvent.event.y_axis = (m_yAxisLockBroken || xOffset < axisLockActivationThreshold) ? -(m_offset.y - touchPoint->y) : 0;
#else
generatedEvent.event = {
wpe_input_axis_event_type_motion,
touchPoint->time, m_start.x, m_start.y,
2, (touchPoint->y - m_offset.y), 0
};
#endif
m_offset.x = touchPoint->x;
m_offset.y = touchPoint->y;
return generatedEvent;
}
}
break;
}
case wpe_input_touch_event_type_up:
{
switch (m_gesturedEvent) {
case GesturedEvent::None:
break;
case GesturedEvent::Click:
{
bool generateClick = true;
#if ENABLE(CONTEXT_MENUS)
generateClick = (touchPoint->time - m_start.time) < contextMenuThreshold;
#endif
if (generateClick) {
m_gesturedEvent = GesturedEvent::None;
ClickEvent generatedEvent;
generatedEvent.event = {
wpe_input_pointer_event_type_null, touchPoint->time, touchPoint->x, touchPoint->y,
0, 0, 0,
};
return generatedEvent;
}
FALLTHROUGH;
}
case GesturedEvent::ContextMenu:
{
m_gesturedEvent = GesturedEvent::None;
ContextMenuEvent generatedEvent;
generatedEvent.event = {
wpe_input_pointer_event_type_null, touchPoint->time, touchPoint->x, touchPoint->y,
0, 0, 0,
};
return generatedEvent;
}
case GesturedEvent::Axis:
{
m_gesturedEvent = GesturedEvent::None;
AxisEvent generatedEvent;
generatedEvent.phase = WebWheelEvent::Phase::PhaseEnded;
#if WPE_CHECK_VERSION(1, 5, 0)
generatedEvent.event.base = {
static_cast<enum wpe_input_axis_event_type>(wpe_input_axis_event_type_mask_2d | wpe_input_axis_event_type_motion_smooth),
touchPoint->time, m_start.x, m_start.y,
0, 0, 0
};
generatedEvent.event.x_axis = generatedEvent.event.y_axis = 0;
#else
generatedEvent.event = {
wpe_input_axis_event_type_motion,
touchPoint->time, m_start.x, m_start.y,
0, 0, 0
};
#endif
m_offset.x = m_offset.y = 0;
return generatedEvent;
}
}
break;
}
default:
break;
}
return NoEvent { };
}
} // namespace WebKit
#endif // USE(LIBWPE) && ENABLE(TOUCH_EVENTS)
|
