summaryrefslogtreecommitdiffstats
path: root/src/gui/kernel/qstandardgestures.cpp
blob: b4c37876d851f723723ce5a257ef1bfa78dcb46d (plain)
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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
/****************************************************************************
**
** 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>
#include <private/qevent_p.h>
#include <private/qwidget_p.h>

QT_BEGIN_NAMESPACE

#ifdef Q_WS_WIN
QWidgetPrivate *qt_widget_private(QWidget *widget);
#endif

/*!
    \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)
{
    if (parent) {
        QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
        qAppPriv->widgetGestures[parent].pan = this;
#ifdef Q_WS_WIN
        qt_widget_private(parent)->winSetupGestures();
#endif
    }
}

/*! \internal */
bool QPanGesture::event(QEvent *event)
{
    switch (event->type()) {
    case QEvent::ParentAboutToChange:
        if (QWidget *w = qobject_cast<QWidget*>(parent())) {
            QApplicationPrivate::instance()->widgetGestures[w].pan = 0;
#ifdef Q_WS_WIN
            qt_widget_private(w)->winSetupGestures();
#endif
        }
        break;
    case QEvent::ParentChange:
        if (QWidget *w = qobject_cast<QWidget*>(parent())) {
            QApplicationPrivate::instance()->widgetGestures[w].pan = this;
#ifdef Q_WS_WIN
            qt_widget_private(w)->winSetupGestures();
#endif
        }
        break;
    default:
        break;
    }

#if defined(Q_OS_MAC) && !defined(QT_MAC_USE_COCOA)
    Q_D(QPanGesture);
    if (event->type() == QEvent::Timer) {
        const QTimerEvent *te = static_cast<QTimerEvent *>(event);
        if (te->timerId() == d->panFinishedTimer) {
            killTimer(d->panFinishedTimer);
            d->panFinishedTimer = 0;
            d->lastOffset = QSize(0, 0);
            updateState(Qt::GestureFinished);
        }
    }
#endif

    return QObject::event(event);
}

bool QPanGesture::eventFilter(QObject *receiver, QEvent *event)
{
#ifdef Q_WS_WIN
    Q_D(QPanGesture);
    if (receiver->isWidgetType() && event->type() == QEvent::NativeGesture) {
        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
        QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
        QApplicationPrivate::WidgetStandardGesturesMap::iterator it;
        it = qAppPriv->widgetGestures.find(static_cast<QWidget*>(receiver));
        if (it == qAppPriv->widgetGestures.end())
            return false;
        if (this != it.value().pan)
            return false;
        Qt::GestureState nextState = Qt::NoGesture;
        switch(ev->gestureType) {
        case QNativeGestureEvent::GestureBegin:
            // next we might receive the first gesture update event, so we
            // prepare for it.
            d->state = Qt::NoGesture;
            return false;
        case QNativeGestureEvent::Pan:
            nextState = Qt::GestureUpdated;
            event->accept();
            break;
        case QNativeGestureEvent::GestureEnd:
            if (state() == Qt::NoGesture)
                return false; // some other gesture has ended
            nextState = Qt::GestureFinished;
            break;
        default:
            return false;
        }
        if (state() == Qt::NoGesture) {
            d->lastOffset = d->totalOffset = QSize();
        } else {
            d->lastOffset = QSize(ev->position.x() - d->lastPosition.x(),
                                  ev->position.y() - d->lastPosition.y());
            d->totalOffset += d->lastOffset;
        }
        d->lastPosition = ev->position;
        updateState(nextState);
        return true;
    }
#endif
    return QGesture::eventFilter(receiver, 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) {
        QTouchEvent::TouchPoint p = ev->touchPoints().at(0);
        d->lastPosition = p.pos().toPoint();
        d->lastOffset = d->totalOffset = QSize();
    } else if (event->type() == QEvent::TouchEnd) {
        if (state() != Qt::NoGesture) {
            if (!ev->touchPoints().isEmpty()) {
                QTouchEvent::TouchPoint p = ev->touchPoints().at(0);
                const QPoint pos = p.pos().toPoint();
                const QPoint lastPos = p.lastPos().toPoint();
                const QPoint startPos = p.startPos().toPoint();
                d->lastOffset = QSize(pos.x() - lastPos.x(), pos.y() - lastPos.y());
                d->totalOffset = QSize(pos.x() - startPos.x(), pos.y() - startPos.y());
            }
            updateState(Qt::GestureFinished);
        }
        reset();
    } else if (event->type() == QEvent::TouchUpdate) {
        QTouchEvent::TouchPoint p = ev->touchPoints().at(0);
        const QPoint pos = p.pos().toPoint();
        const QPoint lastPos = p.lastPos().toPoint();
        const QPoint startPos = p.startPos().toPoint();
        d->lastOffset = QSize(pos.x() - lastPos.x(), pos.y() - lastPos.y());
        d->totalOffset = QSize(pos.x() - startPos.x(), pos.y() - startPos.y());
        if (d->totalOffset.width() > 10  || d->totalOffset.height() > 10 ||
            d->totalOffset.width() < -10 || d->totalOffset.height() < -10) {
            updateState(Qt::GestureUpdated);
        }
    }
#ifdef Q_OS_MAC
    else if (event->type() == QEvent::Wheel) {
        // On Mac, there is really no native panning gesture. Instead, a two 
        // finger pan is delivered as mouse wheel events. Otoh, on Windows, you
        // either get mouse wheel events or pan events. We have decided to make this
        // the Qt behaviour as well, meaning that on Mac, wheel
        // events will be masked away when listening for pan events.
#ifndef QT_MAC_USE_COCOA
        // In Carbon we receive neither touch-, nor pan gesture events.
        // So we create pan gestures by converting wheel events. After all, this
        // is how things are supposed to work on mac in the first place.
        const QWheelEvent *wev = static_cast<const QWheelEvent*>(event);
        int offset = wev->delta() / -120;
        d->lastOffset = wev->orientation() == Qt::Horizontal ? QSize(offset, 0) : QSize(0, offset);

        if (state() == Qt::NoGesture) {
            d->totalOffset = d->lastOffset;
        } else {
            d->totalOffset += d->lastOffset;
        }

        killTimer(d->panFinishedTimer);
        d->panFinishedTimer = startTimer(200);
        updateState(Qt::GestureUpdated);
#endif
        return true;
    }
#endif
    return false;
}

/*! \internal */
void QPanGesture::reset()
{
    Q_D(QPanGesture);
    d->lastOffset = d->totalOffset = QSize();
    d->lastPosition = QPoint();
#if defined(Q_OS_MAC) && !defined(QT_MAC_USE_COCOA)
    if (d->panFinishedTimer) {
        killTimer(d->panFinishedTimer);
        d->panFinishedTimer = 0;
    }
#endif
    QGesture::reset();
}

/*!
    \property QPanGesture::totalOffset

    Specifies a total pan offset since the start of the gesture.
*/
QSize QPanGesture::totalOffset() const
{
    Q_D(const QPanGesture);
    return d->totalOffset;
}

/*!
    \property QPanGesture::lastOffset

    Specifies a pan offset since the last time the gesture was
    triggered.
*/
QSize QPanGesture::lastOffset() const
{
    Q_D(const QPanGesture);
    return d->lastOffset;
}


/*!
    \class QPinchGesture
    \since 4.6

    \brief The QPinchGesture class represents a Pinch gesture,
    providing additional information related to zooming and/or rotation.
*/

/*!
    Creates a new Pinch 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.
*/
QPinchGesture::QPinchGesture(QWidget *parent)
    : QGesture(*new QPinchGesturePrivate, parent)
{
    if (parent) {
        QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
        qAppPriv->widgetGestures[parent].pinch = this;
#ifdef Q_WS_WIN
        qt_widget_private(parent)->winSetupGestures();
#endif
    }
}

/*! \internal */
bool QPinchGesture::event(QEvent *event)
{
    switch (event->type()) {
    case QEvent::ParentAboutToChange:
        if (QWidget *w = qobject_cast<QWidget*>(parent())) {
            QApplicationPrivate::instance()->widgetGestures[w].pinch = 0;
#ifdef Q_WS_WIN
            qt_widget_private(w)->winSetupGestures();
#endif
        }
        break;
    case QEvent::ParentChange:
        if (QWidget *w = qobject_cast<QWidget*>(parent())) {
            QApplicationPrivate::instance()->widgetGestures[w].pinch = this;
#ifdef Q_WS_WIN
            qt_widget_private(w)->winSetupGestures();
#endif
        }
        break;
    default:
        break;
    }
    return QObject::event(event);
}

bool QPinchGesture::eventFilter(QObject *receiver, QEvent *event)
{
#ifdef Q_WS_WIN
    Q_D(QPinchGesture);
    if (receiver->isWidgetType() && event->type() == QEvent::NativeGesture) {
        QNativeGestureEvent *ev = static_cast<QNativeGestureEvent*>(event);
        QApplicationPrivate *qAppPriv = QApplicationPrivate::instance();
        QApplicationPrivate::WidgetStandardGesturesMap::iterator it;
        it = qAppPriv->widgetGestures.find(static_cast<QWidget*>(receiver));
        if (it == qAppPriv->widgetGestures.end())
            return false;
        if (this != it.value().pinch)
            return false;
        Qt::GestureState nextState = Qt::NoGesture;
        switch(ev->gestureType) {
        case QNativeGestureEvent::GestureBegin:
            // next we might receive the first gesture update event, so we
            // prepare for it.
            d->state = Qt::NoGesture;
            d->scaleFactor = d->lastScaleFactor = 1;
            d->rotationAngle = d->lastRotationAngle = 0;
            d->startCenterPoint = d->centerPoint = d->lastCenterPoint = QPoint();
            d->initialDistance = 0;
            return false;
        case QNativeGestureEvent::Rotate:
            d->lastRotationAngle = d->rotationAngle;
            d->rotationAngle = -1 * GID_ROTATE_ANGLE_FROM_ARGUMENT(ev->argument);
            nextState = Qt::GestureUpdated;
            event->accept();
            break;
        case QNativeGestureEvent::Zoom:
            if (d->initialDistance != 0) {
                d->lastScaleFactor = d->scaleFactor;
                int distance = int(qint64(ev->argument));
                d->scaleFactor = (qreal) distance / d->initialDistance;
            } else {
                d->initialDistance = int(qint64(ev->argument));
            }
            nextState = Qt::GestureUpdated;
            event->accept();
            break;
        case QNativeGestureEvent::GestureEnd:
            if (state() == Qt::NoGesture)
                return false; // some other gesture has ended
            nextState = Qt::GestureFinished;
            break;
        default:
            return false;
        }
        if (d->startCenterPoint.isNull())
            d->startCenterPoint = d->centerPoint;
        d->lastCenterPoint = d->centerPoint;
        d->centerPoint = static_cast<QWidget*>(receiver)->mapFromGlobal(ev->position);
        updateState(nextState);
        return true;
    }
#endif
    return QGesture::eventFilter(receiver, event);
}

/*! \internal */
bool QPinchGesture::filterEvent(QEvent *event)
{
    Q_UNUSED(event);
    return false;
}

/*! \internal */
void QPinchGesture::reset()
{
    Q_D(QPinchGesture);
    d->scaleFactor = d->lastScaleFactor = 0;
    d->rotationAngle = d->lastRotationAngle = 0;
    d->startCenterPoint = d->centerPoint = d->lastCenterPoint = QPoint();
    QGesture::reset();
}

/*!
    \property QPinchGesture::scaleFactor

    Specifies a scale factor of the pinch gesture.
*/
qreal QPinchGesture::scaleFactor() const
{
    return d_func()->scaleFactor;
}

/*!
    \property QPinchGesture::lastScaleFactor

    Specifies a previous scale factor of the pinch gesture.
*/
qreal QPinchGesture::lastScaleFactor() const
{
    return d_func()->lastScaleFactor;
}

/*!
    \property QPinchGesture::rotationAngle

    Specifies a rotation angle of the gesture.
*/
qreal QPinchGesture::rotationAngle() const
{
    return d_func()->rotationAngle;
}

/*!
    \property QPinchGesture::lastRotationAngle

    Specifies a previous rotation angle of the gesture.
*/
qreal QPinchGesture::lastRotationAngle() const
{
    return d_func()->lastRotationAngle;
}

/*!
    \property QPinchGesture::centerPoint

    Specifies a center point of the gesture. The point can be used as a center
    point that the object is rotated around.
*/
QPoint QPinchGesture::centerPoint() const
{
    return d_func()->centerPoint;
}

/*!
    \property QPinchGesture::lastCenterPoint

    Specifies a previous center point of the gesture.
*/
QPoint QPinchGesture::lastCenterPoint() const
{
    return d_func()->lastCenterPoint;
}

/*!
    \property QPinchGesture::startCenterPoint

    Specifies an initial center point of the gesture. Difference between the
    startCenterPoint and the centerPoint is the distance at which pinching
    fingers has shifted.
*/
QPoint QPinchGesture::startCenterPoint() const
{
    return d_func()->startCenterPoint;
}

QT_END_NAMESPACE

#include "moc_qstandardgestures.cpp"