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
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qstandardgestures.h"
#include "qstandardgestures_p.h"
#include <qabstractscrollarea.h>
#include <qscrollbar.h>
#include <private/qapplication_p.h>
QT_BEGIN_NAMESPACE
/*!
\class QPanGesture
\since 4.6
\brief The QPanGesture class represents a Pan gesture,
providing additional information related to panning.
*/
/*!
Creates a new Pan gesture handler object and marks it as a child of \a
parent.
On some platform like Windows it's necessary to provide a non-null widget
as \a parent to get native gesture support.
*/
QPanGesture::QPanGesture(QWidget *parent)
: QGesture(*new QPanGesturePrivate, parent)
{
#ifdef Q_WS_WIN
if (parent) {
QApplicationPrivate* getQApplicationPrivateInternal();
QApplicationPrivate *qAppPriv = getQApplicationPrivateInternal();
qAppPriv->widgetGestures[parent].pan = this;
}
#endif
}
/*! \internal */
bool QPanGesture::event(QEvent *event)
{
#ifdef Q_WS_WIN
QApplicationPrivate* getQApplicationPrivateInternal();
switch (event->type()) {
case QEvent::ParentAboutToChange:
if (QWidget *w = qobject_cast<QWidget*>(parent()))
getQApplicationPrivateInternal()->widgetGestures[w].pan = 0;
break;
case QEvent::ParentChange:
if (QWidget *w = qobject_cast<QWidget*>(parent()))
getQApplicationPrivateInternal()->widgetGestures[w].pan = this;
break;
default:
break;
}
#endif
return QObject::event(event);
}
/*! \internal */
bool QPanGesture::filterEvent(QEvent *event)
{
Q_D(QPanGesture);
if (!event->spontaneous())
return false;
const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
if (event->type() == QEvent::TouchBegin) {
d->touchPoints = ev->touchPoints();
const QPoint p = ev->touchPoints().at(0).pos().toPoint();
setStartPos(p);
setLastPos(p);
setPos(p);
return false;
} else if (event->type() == QEvent::TouchEnd) {
if (state() != Qt::NoGesture) {
setState(Qt::GestureFinished);
setLastPos(pos());
setPos(ev->touchPoints().at(0).pos().toPoint());
emit triggered();
emit finished();
}
setState(Qt::NoGesture);
reset();
} else if (event->type() == QEvent::TouchUpdate) {
d->touchPoints = ev->touchPoints();
QPointF pt = d->touchPoints.at(0).pos() - d->touchPoints.at(0).startPos();
setLastPos(pos());
setPos(ev->touchPoints().at(0).pos().toPoint());
if (pt.x() > 10 || pt.y() > 10 || pt.x() < -10 || pt.y() < -10) {
if (state() == Qt::NoGesture)
setState(Qt::GestureStarted);
else
setState(Qt::GestureUpdated);
emit triggered();
}
}
return false;
}
/*! \internal */
void QPanGesture::reset()
{
Q_D(QPanGesture);
d->touchPoints.clear();
}
/*!
\property QPanGesture::totalOffset
Specifies a total pan offset since the start of the gesture.
*/
QSize QPanGesture::totalOffset() const
{
QPoint pt = pos() - startPos();
return QSize(pt.x(), pt.y());
}
/*!
\property QPanGesture::lastOffset
Specifies a pan offset since the last time the gesture was
triggered.
*/
QSize QPanGesture::lastOffset() const
{
QPoint pt = pos() - lastPos();
return QSize(pt.x(), pt.y());
}
/*!
\class QTapAndHoldGesture
\since 4.6
\brief The QTapAndHoldGesture class represents a Tap-and-Hold gesture,
providing additional information.
*/
const int QTapAndHoldGesturePrivate::iterationCount = 40;
const int QTapAndHoldGesturePrivate::iterationTimeout = 50;
/*!
Creates a new Tap and Hold gesture handler object and marks it as a child
of \a parent.
On some platforms like Windows there is a system-wide tap and hold gesture
that cannot be overriden, hence the gesture might never trigger and default
context menu will be shown instead.
*/
QTapAndHoldGesture::QTapAndHoldGesture(QWidget *parent)
: QGesture(*new QTapAndHoldGesturePrivate, parent)
{
}
/*! \internal */
bool QTapAndHoldGesture::filterEvent(QEvent *event)
{
Q_D(QTapAndHoldGesture);
if (!event->spontaneous())
return false;
const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
switch (event->type()) {
case QEvent::TouchBegin: {
if (d->timer.isActive())
d->timer.stop();
d->timer.start(QTapAndHoldGesturePrivate::iterationTimeout, this);
const QPoint p = ev->touchPoints().at(0).pos().toPoint();
setStartPos(p);
setLastPos(p);
setPos(p);
break;
}
case QEvent::TouchUpdate:
if (ev->touchPoints().size() != 1)
reset();
else if ((startPos() - ev->touchPoints().at(0).pos().toPoint()).manhattanLength() > 15)
reset();
break;
case QEvent::TouchEnd:
reset();
break;
default:
break;
}
return false;
}
/*! \internal */
void QTapAndHoldGesture::timerEvent(QTimerEvent *event)
{
Q_D(QTapAndHoldGesture);
if (event->timerId() != d->timer.timerId())
return;
if (d->iteration == QTapAndHoldGesturePrivate::iterationCount) {
d->timer.stop();
setState(Qt::GestureFinished);
emit triggered();
} else {
setState(Qt::GestureStarted);
emit triggered();
}
++d->iteration;
}
/*! \internal */
void QTapAndHoldGesture::reset()
{
Q_D(QTapAndHoldGesture);
if (state() != Qt::NoGesture)
emit cancelled();
setState(Qt::NoGesture);
d->timer.stop();
d->iteration = 0;
}
QT_END_NAMESPACE
|
