1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (developer.feedback@nokia.com)

     6 **

     7 ** This file is part of the HbCore module of the UI Extensions for Mobile.

     8 **

     9 ** GNU Lesser General Public License Usage

    10 ** This file may be used under the terms of the GNU Lesser General Public

    11 ** License version 2.1 as published by the Free Software Foundation and

    12 ** appearing in the file LICENSE.LGPL included in the packaging of this file.

    13 ** Please review the following information to ensure the GNU Lesser General

    14 ** Public License version 2.1 requirements will be met:

    15 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    16 **

    17 ** In addition, as a special exception, Nokia gives you certain additional

    18 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    19 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    20 **

    21 ** If you have questions regarding the use of this file, please contact

    22 ** Nokia at developer.feedback@nokia.com.

    23 **

    24 ****************************************************************************/

    25 

    26 

    27 #include "hbmousepangesturerecognizer_p.h"

    28 

    29 #include <QEvent>

    30 #include <QGraphicsSceneMouseEvent>

    31 #include <QGesture>

    32 #include <QVariant>

    33 

    34 HbMousePanGestureRecognizer::HbMousePanGestureRecognizer()

    35 {

    36 }

    37 

    38 HbMousePanGestureRecognizer::~HbMousePanGestureRecognizer()

    39 {

    40 }

    41 

    42 QGesture* HbMousePanGestureRecognizer::create(QObject *)

    43 {

    44     return new QPanGesture;

    45 }

    46 

    47 QGestureRecognizer::Result HbMousePanGestureRecognizer::recognize(QGesture *state, QObject *, QEvent *event)

    48 {

    49     QPanGesture *g = static_cast<QPanGesture *>(state);

    50     QGraphicsSceneMouseEvent *me = static_cast<QGraphicsSceneMouseEvent *>(event);

    51     QPoint pos;

    52 

    53     switch(event->type()) {

    54     case QEvent::GraphicsSceneMousePress:

    55         g->setOffset(QPointF(0,0));

    56         g->setProperty("startPos", me->screenPos());

    57         g->setProperty("pressed", QVariant::fromValue<bool>(true));

    58     case QEvent::GraphicsSceneMouseMove:

    59     case QEvent::GraphicsSceneMouseRelease:

    60         pos = me->screenPos();

    61         g->setHotSpot(pos);

    62         g->setLastOffset(g->offset());

    63         break;

    64     default:

    65         return QGestureRecognizer::Ignore;

    66     }

    67 

    68     if (event->type() == QEvent::GraphicsSceneMousePress || event->type() == QEvent::GraphicsSceneMouseDoubleClick) {

    69         return QGestureRecognizer::MayBeGesture;

    70     } else if (event->type() == QEvent::GraphicsSceneMouseMove) {

    71         if (g->property("pressed").toBool()) {

    72             QPoint offset = pos - g->property("startPos").toPoint();

    73             g->setOffset(offset);

    74             return QGestureRecognizer::TriggerGesture;

    75         }

    76         return QGestureRecognizer::CancelGesture;

    77     } else if (event->type() == QEvent::GraphicsSceneMouseRelease) {

    78         if(g->state() >= Qt::GestureStarted) {

    79             QPoint offset = pos - g->property("startPos").toPoint();

    80             g->setOffset(offset);

    81             g->setProperty("pressed", QVariant::fromValue<bool>(false));

    82             return QGestureRecognizer::FinishGesture;

    83         } else {

    84             return QGestureRecognizer::CancelGesture;

    85         }

    86 

    87     }

    88     return QGestureRecognizer::Ignore;

    89 }

    90 

    91 void HbMousePanGestureRecognizer::reset(QGesture *state)

    92 {

    93     QPanGesture *g = static_cast<QPanGesture *>(state);

    94     g->setLastOffset(QPointF());

    95     g->setOffset(QPointF(0,0));

    96     g->setAcceleration(0);

    97     g->setProperty("startPos", QVariant());

    98     g->setProperty("pressed", QVariant::fromValue<bool>(false));

    99     QGestureRecognizer::reset(state);

   100 }