/****************************************************************************
**
** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (developer.feedback@nokia.com)
**
** This file is part of the HbCore module of the UI Extensions for Mobile.
**
** GNU Lesser General Public License Usage
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at developer.feedback@nokia.com.
**
****************************************************************************/
#include <QEvent>
#include <QGestureRecognizer>
#include <QGraphicsView>
#include <QMouseEvent>
#include <hbdeviceprofile.h>
#include "hbpangesture.h"
#include "hbpangesture_p.h"
#include "hbpangesturelogic_p.h"
/*!
@hbcore
\internal
\class HbPanGestureLogic
\brief
*/
/*!
\internal
\brief
\return
*/
HbPanGestureLogic::HbPanGestureLogic()
{
mCurrentTime = QTime();
}
HbPanGestureLogic::~HbPanGestureLogic() {}
/*!
\internal
\brief
\return
*/
bool HbPanGestureLogic::isMouseEvent(QEvent::Type eventType)
{
return eventType == QEvent::MouseButtonPress ||
eventType == QEvent::MouseMove ||
eventType == QEvent::MouseButtonDblClick ||
eventType == QEvent::MouseButtonRelease;
}
/*!
\internal
\brief
\return
*/
void HbPanGestureLogic::resetGesture(HbPanGesture *gesture)
{
gesture->d_ptr->mStartPos = QPointF(0,0);
gesture->d_ptr->mDeltaSinceLastTimeStamp = QPointF(0,0);
gesture->d_ptr->mSceneStartPos = QPointF(0,0);
gesture->d_ptr->mSceneLastOffset = QPointF(0,0);
gesture->d_ptr->mSceneOffset = QPointF(0,0);
gesture->d_ptr->mSceneDeltaSinceLastTimeStamp = QPointF(0,0);
gesture->d_ptr->mAxisX.clear();
gesture->d_ptr->mAxisY.clear();
gesture->d_ptr->mSceneAxisX.clear();
gesture->d_ptr->mSceneAxisY.clear();
gesture->setLastOffset(QPointF());
gesture->setOffset(QPointF(0,0));
gesture->setAcceleration(0);
gesture->setStartPos(QPointF());
}
/*!
\internal
\brief
\return
*/
QGestureRecognizer::Result HbPanGestureLogic::handleMousePress(
Qt::GestureState gestureState,
HbPanGesture *gesture,
QObject *watched,
QMouseEvent *me )
{
// Just ignore situations that are not interesting at all.
if ( !( gestureState == Qt::NoGesture && me->button() == Qt::LeftButton ) )
{
return QGestureRecognizer::Ignore;
}
gesture->setHotSpot( me->globalPos() );
gesture->setStartPos( me->globalPos() );
gesture->setOffset( QPointF( 0,0 ) );
gesture->setLastOffset( QPointF( 0,0 ) );
QPointF scenePos = HbGestureUtils::mapToScene(watched, me->globalPos());
gesture->d_ptr->mSceneStartPos = scenePos;
gesture->d_ptr->mSceneOffset = HbGestureUtils::mapToScene(watched, QPointF(0,0));
gesture->d_ptr->mSceneLastOffset = HbGestureUtils::mapToScene(watched, QPointF(0,0));
gesture->d_ptr->mLastTimeStamp = mCurrentTime;
qreal defaultThreshold = HbDefaultPanThreshold * HbDeviceProfile::current().ppmValue();
gesture->d_ptr->mThresholdSquare = defaultThreshold * defaultThreshold;
gesture->d_ptr->mAxisX.resetRecorder(defaultThreshold);
gesture->d_ptr->mAxisY.resetRecorder(defaultThreshold);
gesture->d_ptr->mSceneAxisX.resetRecorder(defaultThreshold);
gesture->d_ptr->mSceneAxisY.resetRecorder(defaultThreshold);
gesture->d_ptr->mAxisX.record( me->globalPos().x(), mCurrentTime );
gesture->d_ptr->mAxisY.record( me->globalPos().y(), mCurrentTime );
gesture->d_ptr->mSceneAxisX.record( scenePos.x(), mCurrentTime );
gesture->d_ptr->mSceneAxisY.record( scenePos.y(), mCurrentTime );
return QGestureRecognizer::MayBeGesture;
}
/*!
\internal
\brief
\return
*/
QGestureRecognizer::Result HbPanGestureLogic::handleMouseMove(
Qt::GestureState gestureState,
HbPanGesture *gesture,
QObject *watched,
QMouseEvent *me )
{
if ( !me->buttons().testFlag(Qt::LeftButton) )
{
return QGestureRecognizer::Ignore;
}
QPointF offset = me->globalPos() - gesture->startPos().toPoint();
if (gestureState == Qt::NoGesture && (offset.x() * offset.x() + offset.y() * offset.y()) <= gesture->d_ptr->mThresholdSquare)
{
return QGestureRecognizer::MayBeGesture;
}
// Hotspot is updated on the press and on events after the gesture started.
// Here we are checking the previously set gestureState.
if (gestureState == Qt::GestureStarted || gestureState == Qt::GestureUpdated) {
gesture->setHotSpot( me->globalPos() );
}
gesture->setLastOffset( gesture->offset().toPoint() );
gesture->setOffset( offset );
gesture->d_ptr->mSceneLastOffset = gesture->d_ptr->mSceneOffset;
gesture->d_ptr->mSceneOffset =
HbGestureUtils::mapToScene(watched, me->globalPos()) - gesture->d_ptr->mSceneStartPos;
gesture->d_ptr->mLastTimeStamp = mCurrentTime;
QPointF scenePos = HbGestureUtils::mapToScene(watched, me->globalPos());
gesture->d_ptr->mAxisX.record( me->globalPos().x(), mCurrentTime );
gesture->d_ptr->mAxisY.record( me->globalPos().y(), mCurrentTime );
gesture->d_ptr->mSceneAxisX.record( scenePos.x(), mCurrentTime );
gesture->d_ptr->mSceneAxisY.record( scenePos.y(), mCurrentTime );
return QGestureRecognizer::TriggerGesture;
}
/*!
\internal
\brief
\return
*/
QGestureRecognizer::Result HbPanGestureLogic::handleMouseRelease(
Qt::GestureState gestureState,
HbPanGesture *gesture,
QObject *watched,
QMouseEvent *me )
{
Q_UNUSED(me->globalPos());
Q_UNUSED(gesture);
Q_UNUSED(watched);
gesture->d_ptr->mLastTimeStamp = mCurrentTime;
if ( gestureState == Qt::GestureStarted || gestureState == Qt::GestureUpdated )
{
return QGestureRecognizer::FinishGesture;
}
else
{
return QGestureRecognizer::CancelGesture;
}
}
/*!
\internal
\brief
\return
*/
QGestureRecognizer::Result HbPanGestureLogic::recognize(
Qt::GestureState gestureState,
HbPanGesture *gesture,
QObject *watched,
QEvent *event,
QTime currentTime)
{
// Record the time right away.
mCurrentTime = currentTime;
if ( isMouseEvent(event->type()) )
{
QMouseEvent* me = static_cast<QMouseEvent*>(event);
switch(event->type())
{
case QEvent::MouseButtonDblClick:
case QEvent::MouseButtonPress:
return handleMousePress(gestureState, gesture, watched, me);
case QEvent::MouseMove:
return handleMouseMove(gestureState, gesture, watched, me);
case QEvent::MouseButtonRelease:
return handleMouseRelease(gestureState, gesture, watched, me);
default: break;
}
}
return QGestureRecognizer::Ignore;
}