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     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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    14 ** this package.

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    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include "qstandardgestures_p.h"

    43 #include "qgesture.h"

    44 #include "qgesture_p.h"

    45 #include "qevent.h"

    46 #include "qwidget.h"

    47 #include "qabstractscrollarea.h"

    48 #include "qdebug.h"

    49 

    50 QT_BEGIN_NAMESPACE

    51 

    52 QPanGestureRecognizer::QPanGestureRecognizer()

    53 {

    54 }

    55 

    56 QGesture *QPanGestureRecognizer::create(QObject *target)

    57 {

    58     if (target && target->isWidgetType()) {

    59 #if defined(Q_OS_WIN) && !defined(QT_NO_NATIVE_GESTURES)

    60         // for scroll areas on Windows we want to use native gestures instead

    61         if (!qobject_cast<QAbstractScrollArea *>(target->parent()))

    62             static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);

    63 #else

    64         static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);

    65 #endif

    66     }

    67     return new QPanGesture;

    68 }

    69 

    70 QGestureRecognizer::Result QPanGestureRecognizer::recognize(QGesture *state,

    71                                                             QObject *,

    72                                                             QEvent *event)

    73 {

    74     QPanGesture *q = static_cast<QPanGesture *>(state);

    75     QPanGesturePrivate *d = q->d_func();

    76 

    77     const QTouchEvent *ev = static_cast<const QTouchEvent *>(event);

    78 

    79     QGestureRecognizer::Result result;

    80     switch (event->type()) {

    81     case QEvent::TouchBegin: {

    82         result = QGestureRecognizer::MayBeGesture;

    83         QTouchEvent::TouchPoint p = ev->touchPoints().at(0);

    84         d->lastOffset = d->offset = QPointF();

    85         break;

    86     }

    87     case QEvent::TouchEnd: {

    88         if (q->state() != Qt::NoGesture) {

    89             if (ev->touchPoints().size() == 2) {

    90                 QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);

    91                 QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);

    92                 d->lastOffset = d->offset;

    93                 d->offset =

    94                         QPointF(p1.pos().x() - p1.startPos().x() + p2.pos().x() - p2.startPos().x(),

    95                               p1.pos().y() - p1.startPos().y() + p2.pos().y() - p2.startPos().y()) / 2;

    96             }

    97             result = QGestureRecognizer::FinishGesture;

    98         } else {

    99             result = QGestureRecognizer::CancelGesture;

   100         }

   101         break;

   102     }

   103     case QEvent::TouchUpdate: {

   104         if (ev->touchPoints().size() >= 2) {

   105             QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);

   106             QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);

   107             d->lastOffset = d->offset;

   108             d->offset =

   109                     QPointF(p1.pos().x() - p1.startPos().x() + p2.pos().x() - p2.startPos().x(),

   110                           p1.pos().y() - p1.startPos().y() + p2.pos().y() - p2.startPos().y()) / 2;

   111             if (d->offset.x() > 10  || d->offset.y() > 10 ||

   112                 d->offset.x() < -10 || d->offset.y() < -10) {

   113                 result = QGestureRecognizer::TriggerGesture;

   114             } else {

   115                 result = QGestureRecognizer::MayBeGesture;

   116             }

   117         }

   118         break;

   119     }

   120     case QEvent::MouseButtonPress:

   121     case QEvent::MouseMove:

   122     case QEvent::MouseButtonRelease:

   123         result = QGestureRecognizer::Ignore;

   124         break;

   125     default:

   126         result = QGestureRecognizer::Ignore;

   127         break;

   128     }

   129     return result;

   130 }

   131 

   132 void QPanGestureRecognizer::reset(QGesture *state)

   133 {

   134     QPanGesture *pan = static_cast<QPanGesture*>(state);

   135     QPanGesturePrivate *d = pan->d_func();

   136 

   137     d->lastOffset = d->offset = QPointF();

   138     d->acceleration = 0;

   139 

   140     QGestureRecognizer::reset(state);

   141 }

   142 

   143 

   144 //

   145 // QPinchGestureRecognizer

   146 //

   147 

   148 QPinchGestureRecognizer::QPinchGestureRecognizer()

   149 {

   150 }

   151 

   152 QGesture *QPinchGestureRecognizer::create(QObject *target)

   153 {

   154     if (target && target->isWidgetType()) {

   155         static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);

   156     }

   157     return new QPinchGesture;

   158 }

   159 

   160 QGestureRecognizer::Result QPinchGestureRecognizer::recognize(QGesture *state,

   161                                                               QObject *,

   162                                                               QEvent *event)

   163 {

   164     QPinchGesture *q = static_cast<QPinchGesture *>(state);

   165     QPinchGesturePrivate *d = q->d_func();

   166 

   167     const QTouchEvent *ev = static_cast<const QTouchEvent *>(event);

   168 

   169     QGestureRecognizer::Result result;

   170 

   171     switch (event->type()) {

   172     case QEvent::TouchBegin: {

   173         result = QGestureRecognizer::MayBeGesture;

   174         break;

   175     }

   176     case QEvent::TouchEnd: {

   177         if (q->state() != Qt::NoGesture) {

   178             result = QGestureRecognizer::FinishGesture;

   179         } else {

   180             result = QGestureRecognizer::CancelGesture;

   181         }

   182         break;

   183     }

   184     case QEvent::TouchUpdate: {

   185         d->changeFlags = 0;

   186         if (ev->touchPoints().size() == 2) {

   187             QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);

   188             QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);

   189 

   190             d->hotSpot = p1.screenPos();

   191             d->isHotSpotSet = true;

   192 

   193             if (d->isNewSequence) {

   194                 d->startPosition[0] = p1.screenPos();

   195                 d->startPosition[1] = p2.screenPos();

   196             }

   197             QLineF line(p1.screenPos(), p2.screenPos());

   198             QLineF tmp(line);

   199             tmp.setLength(line.length() / 2.);

   200             QPointF centerPoint = tmp.p2();

   201 

   202             d->lastCenterPoint = d->centerPoint;

   203             d->centerPoint = centerPoint;

   204             d->changeFlags |= QPinchGesture::CenterPointChanged;

   205 

   206             const qreal scaleFactor =

   207                     QLineF(p1.screenPos(), p2.screenPos()).length()

   208                     / QLineF(d->startPosition[0],  d->startPosition[1]).length();

   209             if (d->isNewSequence) {

   210                 d->lastScaleFactor = scaleFactor;

   211             } else {

   212                 d->lastScaleFactor = d->scaleFactor;

   213             }

   214             d->scaleFactor = scaleFactor;

   215             d->totalScaleFactor += d->scaleFactor - d->lastScaleFactor;

   216             d->changeFlags |= QPinchGesture::ScaleFactorChanged;

   217 

   218             qreal angle = QLineF(p1.screenPos(), p2.screenPos()).angle();

   219             if (angle > 180)

   220                 angle -= 360;

   221             qreal startAngle = QLineF(p1.startScreenPos(), p2.startScreenPos()).angle();

   222             if (startAngle > 180)

   223                 startAngle -= 360;

   224             const qreal rotationAngle = startAngle - angle;

   225             if (d->isNewSequence)

   226                 d->lastRotationAngle = rotationAngle;

   227             else

   228                 d->lastRotationAngle = d->rotationAngle;

   229             d->rotationAngle = rotationAngle;

   230             d->totalRotationAngle += d->rotationAngle - d->lastRotationAngle;

   231             d->changeFlags |= QPinchGesture::RotationAngleChanged;

   232 

   233             d->totalChangeFlags |= d->changeFlags;

   234             d->isNewSequence = false;

   235             result = QGestureRecognizer::TriggerGesture;

   236         } else {

   237             d->isNewSequence = true;

   238             if (q->state() == Qt::NoGesture)

   239                 result = QGestureRecognizer::Ignore;

   240             else

   241                 result = QGestureRecognizer::FinishGesture;

   242         }

   243         break;

   244     }

   245     case QEvent::MouseButtonPress:

   246     case QEvent::MouseMove:

   247     case QEvent::MouseButtonRelease:

   248         result = QGestureRecognizer::Ignore;

   249         break;

   250     default:

   251         result = QGestureRecognizer::Ignore;

   252         break;

   253     }

   254     return result;

   255 }

   256 

   257 void QPinchGestureRecognizer::reset(QGesture *state)

   258 {

   259     QPinchGesture *pinch = static_cast<QPinchGesture *>(state);

   260     QPinchGesturePrivate *d = pinch->d_func();

   261 

   262     d->totalChangeFlags = d->changeFlags = 0;

   263 

   264     d->startCenterPoint = d->lastCenterPoint = d->centerPoint = QPointF();

   265     d->totalScaleFactor = d->lastScaleFactor = d->scaleFactor = 0;

   266     d->totalRotationAngle = d->lastRotationAngle = d->rotationAngle = 0;

   267 

   268     d->isNewSequence = true;

   269     d->startPosition[0] = d->startPosition[1] = QPointF();

   270 

   271     QGestureRecognizer::reset(state);

   272 }

   273 

   274 //

   275 // QSwipeGestureRecognizer

   276 //

   277 

   278 QSwipeGestureRecognizer::QSwipeGestureRecognizer()

   279 {

   280 }

   281 

   282 QGesture *QSwipeGestureRecognizer::create(QObject *target)

   283 {

   284     if (target && target->isWidgetType()) {

   285         static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);

   286     }

   287     return new QSwipeGesture;

   288 }

   289 

   290 QGestureRecognizer::Result QSwipeGestureRecognizer::recognize(QGesture *state,

   291                                                               QObject *,

   292                                                               QEvent *event)

   293 {

   294     QSwipeGesture *q = static_cast<QSwipeGesture *>(state);

   295     QSwipeGesturePrivate *d = q->d_func();

   296 

   297     const QTouchEvent *ev = static_cast<const QTouchEvent *>(event);

   298 

   299     QGestureRecognizer::Result result;

   300 

   301     switch (event->type()) {

   302     case QEvent::TouchBegin: {

   303         d->speed = 1;

   304         d->time = QTime::currentTime();

   305         d->started = true;

   306         result = QGestureRecognizer::MayBeGesture;

   307         break;

   308     }

   309     case QEvent::TouchEnd: {

   310         if (q->state() != Qt::NoGesture) {

   311             result = QGestureRecognizer::FinishGesture;

   312         } else {

   313             result = QGestureRecognizer::CancelGesture;

   314         }

   315         break;

   316     }

   317     case QEvent::TouchUpdate: {

   318         if (!d->started)

   319             result = QGestureRecognizer::CancelGesture;

   320         else if (ev->touchPoints().size() == 3) {

   321             QTouchEvent::TouchPoint p1 = ev->touchPoints().at(0);

   322             QTouchEvent::TouchPoint p2 = ev->touchPoints().at(1);

   323             QTouchEvent::TouchPoint p3 = ev->touchPoints().at(2);

   324 

   325             if (d->lastPositions[0].isNull()) {

   326                 d->lastPositions[0] = p1.startScreenPos().toPoint();

   327                 d->lastPositions[1] = p2.startScreenPos().toPoint();

   328                 d->lastPositions[2] = p3.startScreenPos().toPoint();

   329             }

   330             d->hotSpot = p1.screenPos();

   331             d->isHotSpotSet = true;

   332 

   333             int xDistance = (p1.screenPos().x() - d->lastPositions[0].x() +

   334                              p2.screenPos().x() - d->lastPositions[1].x() +

   335                              p3.screenPos().x() - d->lastPositions[2].x()) / 3;

   336             int yDistance = (p1.screenPos().y() - d->lastPositions[0].y() +

   337                              p2.screenPos().y() - d->lastPositions[1].y() +

   338                              p3.screenPos().y() - d->lastPositions[2].y()) / 3;

   339 

   340             const int distance = xDistance >= yDistance ? xDistance : yDistance;

   341             int elapsedTime = d->time.msecsTo(QTime::currentTime());

   342             if (!elapsedTime)

   343                 elapsedTime = 1;

   344             d->speed = 0.9 * d->speed + distance / elapsedTime;

   345             d->time = QTime::currentTime();

   346             d->swipeAngle = QLineF(p1.startScreenPos(), p1.screenPos()).angle();

   347 

   348             static const int MoveThreshold = 50;

   349             if (xDistance > MoveThreshold || yDistance > MoveThreshold) {

   350                 // measure the distance to check if the direction changed

   351                 d->lastPositions[0] = p1.screenPos().toPoint();

   352                 d->lastPositions[1] = p2.screenPos().toPoint();

   353                 d->lastPositions[2] = p3.screenPos().toPoint();

   354                 QSwipeGesture::SwipeDirection horizontal =

   355                         xDistance > 0 ? QSwipeGesture::Right : QSwipeGesture::Left;

   356                 QSwipeGesture::SwipeDirection vertical =

   357                         yDistance > 0 ? QSwipeGesture::Down : QSwipeGesture::Up;

   358                 if (d->verticalDirection == QSwipeGesture::NoDirection)

   359                     d->verticalDirection = vertical;

   360                 if (d->horizontalDirection == QSwipeGesture::NoDirection)

   361                     d->horizontalDirection = horizontal;

   362                 if (d->verticalDirection != vertical || d->horizontalDirection != horizontal) {

   363                     // the user has changed the direction!

   364                     result = QGestureRecognizer::CancelGesture;

   365                 }

   366                 result = QGestureRecognizer::TriggerGesture;

   367             } else {

   368                 if (q->state() != Qt::NoGesture)

   369                     result = QGestureRecognizer::TriggerGesture;

   370                 else

   371                     result = QGestureRecognizer::MayBeGesture;

   372             }

   373         } else if (ev->touchPoints().size() > 3) {

   374             result = QGestureRecognizer::CancelGesture;

   375         } else { // less than 3 touch points

   376             if (d->started && (ev->touchPointStates() & Qt::TouchPointPressed))

   377                 result = QGestureRecognizer::CancelGesture;

   378             else if (d->started)

   379                 result = QGestureRecognizer::Ignore;

   380             else

   381                 result = QGestureRecognizer::MayBeGesture;

   382         }

   383         break;

   384     }

   385     case QEvent::MouseButtonPress:

   386     case QEvent::MouseMove:

   387     case QEvent::MouseButtonRelease:

   388         result = QGestureRecognizer::Ignore;

   389         break;

   390     default:

   391         result = QGestureRecognizer::Ignore;

   392         break;

   393     }

   394     return result;

   395 }

   396 

   397 void QSwipeGestureRecognizer::reset(QGesture *state)

   398 {

   399     QSwipeGesture *q = static_cast<QSwipeGesture *>(state);

   400     QSwipeGesturePrivate *d = q->d_func();

   401 

   402     d->verticalDirection = d->horizontalDirection = QSwipeGesture::NoDirection;

   403     d->swipeAngle = 0;

   404 

   405     d->lastPositions[0] = d->lastPositions[1] = d->lastPositions[2] = QPoint();

   406     d->started = false;

   407     d->speed = 0;

   408     d->time = QTime();

   409 

   410     QGestureRecognizer::reset(state);

   411 }

   412 

   413 //

   414 // QTapGestureRecognizer

   415 //

   416 

   417 QTapGestureRecognizer::QTapGestureRecognizer()

   418 {

   419 }

   420 

   421 QGesture *QTapGestureRecognizer::create(QObject *target)

   422 {

   423     if (target && target->isWidgetType()) {

   424         static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);

   425     }

   426     return new QTapGesture;

   427 }

   428 

   429 QGestureRecognizer::Result QTapGestureRecognizer::recognize(QGesture *state,

   430                                                             QObject *,

   431                                                             QEvent *event)

   432 {

   433     QTapGesture *q = static_cast<QTapGesture *>(state);

   434     QTapGesturePrivate *d = q->d_func();

   435 

   436     const QTouchEvent *ev = static_cast<const QTouchEvent *>(event);

   437 

   438     QGestureRecognizer::Result result = QGestureRecognizer::CancelGesture;

   439 

   440     switch (event->type()) {

   441     case QEvent::TouchBegin: {

   442         d->position = ev->touchPoints().at(0).pos();

   443         result = QGestureRecognizer::TriggerGesture;

   444         break;

   445     }

   446     case QEvent::TouchUpdate:

   447     case QEvent::TouchEnd: {

   448         if (q->state() != Qt::NoGesture && ev->touchPoints().size() == 1) {

   449             QTouchEvent::TouchPoint p = ev->touchPoints().at(0);

   450             QPoint delta = p.pos().toPoint() - p.startPos().toPoint();

   451             enum { TapRadius = 40 };

   452             if (delta.manhattanLength() <= TapRadius) {

   453                 if (event->type() == QEvent::TouchEnd)

   454                     result = QGestureRecognizer::FinishGesture;

   455                 else

   456                     result = QGestureRecognizer::TriggerGesture;

   457             }

   458         }

   459         break;

   460     }

   461     case QEvent::MouseButtonPress:

   462     case QEvent::MouseMove:

   463     case QEvent::MouseButtonRelease:

   464         result = QGestureRecognizer::Ignore;

   465         break;

   466     default:

   467         result = QGestureRecognizer::Ignore;

   468         break;

   469     }

   470     return result;

   471 }

   472 

   473 void QTapGestureRecognizer::reset(QGesture *state)

   474 {

   475     QTapGesture *q = static_cast<QTapGesture *>(state);

   476     QTapGesturePrivate *d = q->d_func();

   477 

   478     d->position = QPointF();

   479 

   480     QGestureRecognizer::reset(state);

   481 }

   482 

   483 //

   484 // QTapAndHoldGestureRecognizer

   485 //

   486 

   487 QTapAndHoldGestureRecognizer::QTapAndHoldGestureRecognizer()

   488 {

   489 }

   490 

   491 QGesture *QTapAndHoldGestureRecognizer::create(QObject *target)

   492 {

   493     if (target && target->isWidgetType()) {

   494         static_cast<QWidget *>(target)->setAttribute(Qt::WA_AcceptTouchEvents);

   495     }

   496     return new QTapAndHoldGesture;

   497 }

   498 

   499 QGestureRecognizer::Result

   500 QTapAndHoldGestureRecognizer::recognize(QGesture *state, QObject *object,

   501                                         QEvent *event)

   502 {

   503     QTapAndHoldGesture *q = static_cast<QTapAndHoldGesture *>(state);

   504     QTapAndHoldGesturePrivate *d = q->d_func();

   505 

   506     if (object == state && event->type() == QEvent::Timer) {

   507         q->killTimer(d->timerId);

   508         d->timerId = 0;

   509         return QGestureRecognizer::Ignore | QGestureRecognizer::ConsumeEventHint;

   510     }

   511 

   512     const QTouchEvent *ev = static_cast<const QTouchEvent *>(event);

   513 

   514     QGestureRecognizer::Result result = QGestureRecognizer::CancelGesture;

   515 

   516     enum { TimerInterval = 2000 };

   517     enum { TapRadius = 40 };

   518 

   519     switch (event->type()) {

   520     case QEvent::TouchBegin:

   521         d->position = ev->touchPoints().at(0).pos();

   522         if (d->timerId)

   523             q->killTimer(d->timerId);

   524         d->timerId = q->startTimer(TimerInterval);

   525         result = QGestureRecognizer::TriggerGesture;

   526         break;

   527     case QEvent::TouchEnd:

   528         if (d->timerId)

   529             result = QGestureRecognizer::CancelGesture;

   530         else

   531             result = QGestureRecognizer::FinishGesture;

   532         break;

   533     case QEvent::TouchUpdate:

   534         if (q->state() != Qt::NoGesture && ev->touchPoints().size() == 1) {

   535             QTouchEvent::TouchPoint p = ev->touchPoints().at(0);

   536             QPoint delta = p.pos().toPoint() - p.startPos().toPoint();

   537             if (delta.manhattanLength() <= TapRadius)

   538                 result = QGestureRecognizer::TriggerGesture;

   539         }

   540         break;

   541     case QEvent::MouseButtonPress:

   542     case QEvent::MouseMove:

   543     case QEvent::MouseButtonRelease:

   544         result = QGestureRecognizer::Ignore;

   545         break;

   546     default:

   547         result = QGestureRecognizer::Ignore;

   548         break;

   549     }

   550     return result;

   551 }

   552 

   553 void QTapAndHoldGestureRecognizer::reset(QGesture *state)

   554 {

   555     QTapAndHoldGesture *q = static_cast<QTapAndHoldGesture *>(state);

   556     QTapAndHoldGesturePrivate *d = q->d_func();

   557 

   558     d->position = QPointF();

   559     if (d->timerId)

   560         q->killTimer(d->timerId);

   561     d->timerId = 0;

   562 

   563     QGestureRecognizer::reset(state);

   564 }

   565 

   566 QT_END_NAMESPACE