/****************************************************************************+
−
**+
−
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
−
** All rights reserved.+
−
** Contact: Nokia Corporation (qt-info@nokia.com)+
−
**+
−
** This file is part of the examples 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 Technology Preview License Agreement accompanying+
−
** this package.+
−
**+
−
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
−
**+
−
** If you have questions regarding the use of this file, please contact+
−
** Nokia at qt-info@nokia.com.+
−
**+
−
**+
−
**+
−
**+
−
**+
−
**+
−
**+
−
**+
−
** $QT_END_LICENSE$+
−
**+
−
****************************************************************************/+
−
+
−
#include "knob.h"+
−
+
−
#include <QBrush>+
−
#include <QTouchEvent>+
−
+
−
Knob::Knob()+
−
    : QGraphicsEllipseItem(-50, -50, 100, 100)+
−
{+
−
    setAcceptTouchEvents(true);+
−
    setBrush(Qt::lightGray);+
−
+
−
    QGraphicsEllipseItem *leftItem = new QGraphicsEllipseItem(0, 0, 20, 20, this);+
−
    leftItem->setPos(-40, -10);+
−
    leftItem->setBrush(Qt::darkGreen);+
−
+
−
    QGraphicsEllipseItem *rightItem = new QGraphicsEllipseItem(0, 0, 20, 20, this);+
−
    rightItem->setPos(20, -10);+
−
    rightItem->setBrush(Qt::darkRed);+
−
}+
−
+
−
bool Knob::sceneEvent(QEvent *event)+
−
{+
−
    switch (event->type()) {+
−
    case QEvent::TouchBegin:+
−
    case QEvent::TouchUpdate:+
−
    case QEvent::TouchEnd:+
−
    {+
−
        QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);+
−
+
−
        if (touchEvent->touchPoints().count() == 2) {+
−
            const QTouchEvent::TouchPoint &touchPoint1 = touchEvent->touchPoints().first();+
−
            const QTouchEvent::TouchPoint &touchPoint2 = touchEvent->touchPoints().last();+
−
+
−
            QLineF line1(touchPoint1.lastScenePos(), touchPoint2.lastScenePos());+
−
            QLineF line2(touchPoint1.scenePos(), touchPoint2.scenePos());+
−
+
−
            rotate(line2.angleTo(line1));+
−
        }+
−
+
−
        break;+
−
    }+
−
+
−
    default:+
−
        return QGraphicsItem::sceneEvent(event);+
−
    }+
−
+
−
    return true;+
−
}+
−