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 #include <QEvent>

    27 #include <QGestureRecognizer>

    28 #include <QGraphicsView>

    29 #include <QMouseEvent>

    30 

    31 #include "hbswipegesture.h"

    32 #include "hbswipegesture_p.h"

    33 #include "hbswipegesturelogic_p.h"

    34 

    35 /*!

    36    @hbcore

    37    \internal

    38    \class HbSwipeGestureLogic

    39 

    40    \brief

    41 

    42 */

    43 

    44 

    45 /*!

    46     \internal

    47     \brief

    48     \return

    49 

    50 */

    51 HbSwipeGestureLogic::HbSwipeGestureLogic()

    52 {

    53     mCurrentTime = QTime();

    54 }

    55 

    56 HbSwipeGestureLogic::~HbSwipeGestureLogic() {}

    57 

    58 /*!

    59     \internal

    60     \brief

    61     \return

    62 

    63 */

    64 bool HbSwipeGestureLogic::isMouseEvent(QEvent::Type eventType)

    65 {

    66     return eventType == QEvent::MouseButtonPress ||

    67            eventType == QEvent::MouseMove ||

    68            eventType == QEvent::MouseButtonDblClick ||

    69            eventType == QEvent::MouseButtonRelease;

    70 }

    71 

    72 /*!

    73     \internal

    74     \brief

    75     \return

    76 

    77 */

    78 void HbSwipeGestureLogic::resetGesture(HbSwipeGesture *gesture)

    79 {   

    80     gesture->setSwipeAngle(0);

    81     gesture->setSceneSwipeAngle(0);

    82 

    83     gesture->d_func()->mStartPos = QPointF();

    84     gesture->d_func()->mSceneStartPos = QPointF();    

    85 }

    86 

    87 /*!

    88     \internal

    89     \brief

    90     \return

    91 

    92 */

    93 QGestureRecognizer::Result HbSwipeGestureLogic::handleMousePress(

    94         Qt::GestureState gestureState,

    95         HbSwipeGesture *gesture,

    96         QObject *watched,

    97         QMouseEvent *me )

    98 {

    99     // Just ignore situations that are not interesting at all.

   100     if (!(gestureState == Qt::NoGesture && me->button() == Qt::LeftButton)) {

   101         return QGestureRecognizer::Ignore;

   102     }

   103     gesture->d_func()->mStartTime = QTime::currentTime();  

   104 

   105     gesture->d_func()->mStartPos = me->globalPos();

   106     gesture->d_func()->mSceneStartPos = HbGestureUtils::mapToScene(watched, me->globalPos());

   107 

   108     gesture->setHotSpot(me->globalPos());

   109 

   110     return QGestureRecognizer::MayBeGesture;

   111 }

   112 

   113 /*!

   114     \internal

   115     \brief

   116     \return

   117 

   118 */

   119 QGestureRecognizer::Result HbSwipeGestureLogic::handleMouseRelease(

   120         Qt::GestureState gestureState,

   121         HbSwipeGesture *gesture,

   122         QObject *watched,

   123         QMouseEvent *me )

   124 {   

   125     Q_UNUSED(gesture);

   126     Q_UNUSED(watched);

   127     Q_UNUSED(gestureState);

   128 

   129     QPointF totalOffset = me->globalPos() - gesture->d_func()->mStartPos.toPoint();

   130 

   131     QPointF velocity = totalOffset / gesture->d_func()->mStartTime.elapsed();

   132 

   133     gesture->setSwipeAngle(QLineF(gesture->d_func()->mStartPos, me->globalPos()).angle());

   134     gesture->setSceneSwipeAngle(QLineF(gesture->d_func()->mSceneStartPos, HbGestureUtils::mapToScene(watched, me->globalPos())).angle());

   135 

   136     if (totalOffset.manhattanLength() >= HbSwipeMinOffset && velocity.manhattanLength() >= HbSwipeMinSpeed && me->button() == Qt::LeftButton) {

   137         return QGestureRecognizer::FinishGesture;

   138     } else {

   139         return QGestureRecognizer::Ignore;

   140     }

   141 }

   142 

   143 /*!

   144     \internal

   145     \brief

   146     \return

   147 

   148 */

   149 QGestureRecognizer::Result HbSwipeGestureLogic::recognize(

   150         Qt::GestureState gestureState,

   151         HbSwipeGesture *gesture,

   152         QObject *watched,

   153         QEvent *event )

   154 {

   155     // Record the time right away.

   156     mCurrentTime = QTime::currentTime();

   157     

   158     if ( isMouseEvent(event->type()) )

   159     {

   160         QMouseEvent* me = static_cast<QMouseEvent*>(event);

   161         switch(event->type())

   162         {

   163         case QEvent::MouseButtonDblClick:

   164         case QEvent::MouseButtonPress:

   165             return handleMousePress(gestureState, gesture, watched, me);

   166 

   167         case QEvent::MouseMove:

   168             if (me->buttons().testFlag(Qt::LeftButton))

   169                 return QGestureRecognizer::MayBeGesture;

   170             else

   171                 return QGestureRecognizer::Ignore;

   172         case QEvent::MouseButtonRelease:

   173             return handleMouseRelease(gestureState, gesture, watched, me);

   174 

   175         default: break;

   176         }

   177     }

   178     return QGestureRecognizer::Ignore;

   179 }