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
222
223
224
225
226
227
228
229
230
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/gestures/gesture_point.h"
#include <cmath>
#include "base/basictypes.h"
#include "ui/base/gestures/gesture_configuration.h"
#include "ui/base/gestures/gesture_types.h"
#include "ui/base/gestures/gesture_util.h"
#include "ui/events/event.h"
#include "ui/events/event_constants.h"
namespace ui {
GesturePoint::GesturePoint()
: first_touch_time_(0.0),
second_last_touch_time_(0.0),
last_touch_time_(0.0),
second_last_tap_time_(0.0),
last_tap_time_(0.0),
velocity_calculator_(
GestureConfiguration::points_buffered_for_velocity()),
point_id_(-1),
touch_id_(-1) {
}
GesturePoint::~GesturePoint() {}
void GesturePoint::Reset() {
first_touch_time_ = second_last_touch_time_ = last_touch_time_ = 0.0;
ResetVelocity();
point_id_ = -1;
clear_enclosing_rectangle();
}
void GesturePoint::ResetVelocity() {
velocity_calculator_.ClearHistory();
same_direction_count_ = gfx::Vector2d();
}
gfx::Vector2d GesturePoint::ScrollDelta() {
return last_touch_position_ - second_last_touch_position_;
}
void GesturePoint::UpdateValues(const TouchEvent& event) {
const int64 event_timestamp_microseconds =
event.time_stamp().InMicroseconds();
if (event.type() == ui::ET_TOUCH_MOVED) {
velocity_calculator_.PointSeen(event.location().x(),
event.location().y(),
event_timestamp_microseconds);
gfx::Vector2d sd(ScrollVelocityDirection(velocity_calculator_.XVelocity()),
ScrollVelocityDirection(velocity_calculator_.YVelocity()));
same_direction_count_ = same_direction_count_ + sd;
}
last_touch_time_ = event.time_stamp().InSecondsF();
last_touch_position_ = event.location();
if (event.type() == ui::ET_TOUCH_PRESSED) {
ResetVelocity();
clear_enclosing_rectangle();
first_touch_time_ = last_touch_time_;
first_touch_position_ = event.location();
second_last_touch_position_ = last_touch_position_;
second_last_touch_time_ = last_touch_time_;
velocity_calculator_.PointSeen(event.location().x(),
event.location().y(),
event_timestamp_microseconds);
}
UpdateEnclosingRectangle(event);
}
void GesturePoint::UpdateForTap() {
// Update the tap-position and time, and reset every other state.
second_last_tap_position_ = last_tap_position_;
second_last_tap_time_ = last_tap_time_;
last_tap_time_ = last_touch_time_;
last_tap_position_ = last_touch_position_;
}
void GesturePoint::UpdateForScroll() {
second_last_touch_position_ = last_touch_position_;
second_last_touch_time_ = last_touch_time_;
same_direction_count_ = gfx::Vector2d();
}
bool GesturePoint::IsInClickWindow(const TouchEvent& event) const {
return IsInClickTimeWindow() && IsInsideManhattanSquare(event);
}
bool GesturePoint::IsInDoubleClickWindow(const TouchEvent& event) const {
return IsInClickAggregateTimeWindow(last_tap_time_, last_touch_time_) &&
IsPointInsideManhattanSquare(event.location(), last_tap_position_);
}
bool GesturePoint::IsInTripleClickWindow(const TouchEvent& event) const {
return IsInClickAggregateTimeWindow(last_tap_time_, last_touch_time_) &&
IsInClickAggregateTimeWindow(second_last_tap_time_, last_tap_time_) &&
IsPointInsideManhattanSquare(event.location(), last_tap_position_) &&
IsPointInsideManhattanSquare(last_tap_position_,
second_last_tap_position_);
}
bool GesturePoint::IsInScrollWindow(const TouchEvent& event) const {
if (IsConsistentScrollingActionUnderway())
return true;
return event.type() == ui::ET_TOUCH_MOVED &&
!IsInsideManhattanSquare(event);
}
bool GesturePoint::IsInFlickWindow(const TouchEvent& event) {
return IsOverMinFlickSpeed() &&
event.type() != ui::ET_TOUCH_CANCELLED;
}
int GesturePoint::ScrollVelocityDirection(float v) {
if (v < -GestureConfiguration::min_scroll_velocity())
return -1;
else if (v > GestureConfiguration::min_scroll_velocity())
return 1;
else
return 0;
}
bool GesturePoint::DidScroll(const TouchEvent& event, int dist) const {
gfx::Vector2d d = last_touch_position_ - second_last_touch_position_;
return abs(d.x()) > dist || abs(d.y()) > dist;
}
bool GesturePoint::IsConsistentScrollingActionUnderway() const {
int me = GestureConfiguration::min_scroll_successive_velocity_events();
if (abs(same_direction_count_.x()) >= me ||
abs(same_direction_count_.y()) >= me)
return true;
return false;
}
bool GesturePoint::IsInHorizontalRailWindow() const {
gfx::Vector2d d = last_touch_position_ - second_last_touch_position_;
return abs(d.x()) >
GestureConfiguration::rail_start_proportion() * abs(d.y());
}
bool GesturePoint::IsInVerticalRailWindow() const {
gfx::Vector2d d = last_touch_position_ - second_last_touch_position_;
return abs(d.y()) >
GestureConfiguration::rail_start_proportion() * abs(d.x());
}
bool GesturePoint::BreaksHorizontalRail() {
float vx = XVelocity();
float vy = YVelocity();
return fabs(vy) > GestureConfiguration::rail_break_proportion() * fabs(vx) +
GestureConfiguration::min_rail_break_velocity();
}
bool GesturePoint::BreaksVerticalRail() {
float vx = XVelocity();
float vy = YVelocity();
return fabs(vx) > GestureConfiguration::rail_break_proportion() * fabs(vy) +
GestureConfiguration::min_rail_break_velocity();
}
bool GesturePoint::IsInClickTimeWindow() const {
double duration = last_touch_time_ - first_touch_time_;
return duration >=
GestureConfiguration::min_touch_down_duration_in_seconds_for_click() &&
duration <
GestureConfiguration::max_touch_down_duration_in_seconds_for_click();
}
bool GesturePoint::IsInClickAggregateTimeWindow(double before,
double after) const {
double duration = after - before;
return duration < GestureConfiguration::max_seconds_between_double_click();
}
bool GesturePoint::IsInsideManhattanSquare(const TouchEvent& event) const {
return ui::gestures::IsInsideManhattanSquare(event.location(),
first_touch_position_);
}
bool GesturePoint::IsPointInsideManhattanSquare(gfx::Point p1,
gfx::Point p2) const {
int manhattan_distance = abs(p1.x() - p2.x()) + abs(p1.y() - p2.y());
return manhattan_distance <
GestureConfiguration::max_distance_between_taps_for_double_tap();
}
bool GesturePoint::IsOverMinFlickSpeed() {
return velocity_calculator_.VelocitySquared() >
GestureConfiguration::min_flick_speed_squared();
}
void GesturePoint::UpdateEnclosingRectangle(const TouchEvent& event) {
int radius;
// Ignore this TouchEvent if it has a radius larger than the maximum
// allowed radius size.
if (event.radius_x() > GestureConfiguration::max_radius() ||
event.radius_y() > GestureConfiguration::max_radius())
return;
// If the device provides at least one of the radius values, take the larger
// of the two and use this as both the x radius and the y radius of the
// touch region. Otherwise use the default radius value.
// TODO(tdanderson): Implement a more specific check for the exact
// information provided by the device (0-2 radii values, force, angle) and
// use this to compute a more representative rectangular touch region.
if (event.radius_x() || event.radius_y())
radius = std::max(event.radius_x(), event.radius_y());
else
radius = GestureConfiguration::default_radius();
gfx::Rect rect(event.location().x() - radius,
event.location().y() - radius,
radius * 2,
radius * 2);
if (IsInClickWindow(event))
enclosing_rect_.Union(rect);
else
enclosing_rect_ = rect;
}
} // namespace ui
|
