Qt Reference Documentation
Search index:

cloud.cpp Example File

network/bearercloud/cloud.cpp 
 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation ([email protected])
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "cloud.h"
 #include "bearercloud.h"

 #include <qnetworksession.h>

 #include <QGraphicsTextItem>
 #include <QGraphicsSvgItem>
 #include <QGraphicsSceneMouseEvent>
 #include <QSvgRenderer>
 #include <QPainter>

 #include <QDebug>

 #include <math.h>

 static QMap<QNetworkConfiguration::BearerType, QSvgRenderer *> svgCache;

 Cloud::Cloud(const QNetworkConfiguration &config, QGraphicsItem *parent)
 :   QGraphicsItem(parent), configuration(config), deleteAfterAnimation(false)
 {
     session = new QNetworkSession(configuration, this);
     connect(session, SIGNAL(newConfigurationActivated()),
             this, SLOT(newConfigurationActivated()));
     connect(session, SIGNAL(stateChanged(QNetworkSession::State)),
             this, SLOT(stateChanged(QNetworkSession::State)));

     setFlag(ItemIsMovable);
 #if (QT_VERSION >= QT_VERSION_CHECK(4, 6, 0))
     setFlag(ItemSendsGeometryChanges);
 #endif
     setZValue(1);

     icon = new QGraphicsSvgItem(this);
     text = new QGraphicsTextItem(this);

     currentScale = 0;
     finalScale = 1;
     setTransform(QTransform::fromScale(currentScale, currentScale), false);
     setOpacity(0);

     newConfigurationActivated();
 }

 Cloud::~Cloud()
 {
 }

 void Cloud::setFinalScale(qreal factor)
 {
     finalScale = factor;
 }

 void Cloud::setDeleteAfterAnimation(bool deleteAfter)
 {
     deleteAfterAnimation = deleteAfter;
 }

 void Cloud::calculateForces()
 {
     if (!scene() || scene()->mouseGrabberItem() == this) {
         newPos = pos();
         return;
     }

     // sum up all the forces push this item away
     qreal xvel = 0;
     qreal yvel = 0;
     QLineF orbitForce;
     foreach (QGraphicsItem *item, scene()->items()) {
         // other clouds
         Cloud *cloud = qgraphicsitem_cast<Cloud *>(item);
         if (!cloud && item->data(0) != QLatin1String("This Device"))
             continue;

         qreal factor = 1.0;

         QLineF line(cloud ? item->mapToScene(0, 0) : QPointF(0, 0), mapToScene(0, 0));
         if (item->data(0) == QLatin1String("This Device"))
             orbitForce = line;

         if (cloud)
             factor = cloud->currentScale;

         qreal dx = line.dx();
         qreal dy = line.dy();
         double l = 2.0 * (dx * dx + dy * dy);
         if (l > 0) {
             xvel += factor * dx * 200.0 / l;
             yvel += factor * dy * 200.0 / l;
         }
     }

     // tendency to stay at a fixed orbit
     qreal orbit = getRadiusForState(configuration.state());
     qreal distance = orbitForce.length();

     QLineF unit = orbitForce.unitVector();

     orbitForce.setLength(xvel * unit.dx() + yvel * unit.dy());

     qreal w = 2 - exp(-pow(distance-orbit, 2)/(2 * 50));

     if (distance < orbit) {
         xvel += orbitForce.dx() * w;
         yvel += orbitForce.dy() * w;
     } else {
         xvel -= orbitForce.dx() * w;
         yvel -= orbitForce.dy() * w;
     }

     if (qAbs(xvel) < 0.1 && qAbs(yvel) < 0.1)
         xvel = yvel = 0;

     QRectF sceneRect = scene()->sceneRect();
     newPos = pos() + QPointF(xvel, yvel);
     newPos.setX(qMin(qMax(newPos.x(), sceneRect.left() + 10), sceneRect.right() - 10));
     newPos.setY(qMin(qMax(newPos.y(), sceneRect.top() + 10), sceneRect.bottom() - 10));
 }

 bool Cloud::advance()
 {
     static const qreal scaleDelta = 0.01;

     bool animated = false;

     if (currentScale < finalScale) {
         animated = true;
         currentScale = qMin<qreal>(currentScale + scaleDelta, finalScale);
         setTransform(QTransform::fromScale(currentScale, currentScale), false);
     } else if (currentScale > finalScale) {
         animated = true;
         currentScale = qMax<qreal>(currentScale - scaleDelta, finalScale);
         setTransform(QTransform::fromScale(currentScale, currentScale), false);
     }

     if (newPos != pos()) {
         setPos(newPos);
         animated = true;
     }

     if (opacity() != finalOpacity) {
         animated = true;
         if (qAbs(finalScale - currentScale) > 0.0) {
             // use scale as reference
             setOpacity(opacity() + scaleDelta * (finalOpacity - opacity()) /
                        qAbs(finalScale - currentScale));
         } else {
             setOpacity(finalOpacity);
         }
     }

     if (!animated && deleteAfterAnimation)
         deleteLater();

     return animated;
 }

 QRectF Cloud::boundingRect() const
 {
     return childrenBoundingRect();
 }

 void Cloud::paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *)
 {
 }

 QVariant Cloud::itemChange(GraphicsItemChange change, const QVariant &value)
 {
     switch (change) {
     case ItemPositionHasChanged:
         if (BearerCloud *bearercloud = qobject_cast<BearerCloud *>(scene()))
             bearercloud->cloudMoved();
     default:
         ;
     };

     return QGraphicsItem::itemChange(change, value);
 }

 void Cloud::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
 {
     if (event->button() == Qt::LeftButton) {
         if (session->isOpen())
             session->close();
         else
             session->open();

         event->accept();
     }
 }

 void Cloud::stateChanged(QNetworkSession::State state)
 {
     if (configuration.name().isEmpty())
         finalOpacity = qreal(0.1);
     else if (session->state() == QNetworkSession::NotAvailable)
         finalOpacity = 0.5;
     else
         finalOpacity = 1.0;

 #if !defined(Q_WS_MAEMO_5) && !defined(Q_WS_MAEMO_6) && \
     !defined(Q_OS_SYMBIAN) && !defined(Q_OS_WINCE)
     QString tooltip;

     if (configuration.name().isEmpty())
         tooltip += tr("<b>HIDDEN NETWORK</b><br>");
     else
         tooltip += tr("<b>%1</b><br>").arg(configuration.name());

 #ifndef QT_NO_NETWORKINTERFACE
     const QNetworkInterface interface = session->interface();
     if (interface.isValid())
         tooltip += tr("<br>Interface: %1").arg(interface.humanReadableName());
     tooltip += tr("<br>Id: %1").arg(configuration.identifier());
 #endif

     const QString bearerTypeName = configuration.bearerTypeName();
     if (!bearerTypeName.isEmpty())
         tooltip += tr("<br>Bearer: %1").arg(bearerTypeName);

     QString s = tr("<br>State: %1 (%2)");
     switch (state) {
     case QNetworkSession::Invalid:
         s = s.arg(tr("Invalid"));
         break;
     case QNetworkSession::NotAvailable:
         s = s.arg(tr("Not Available"));
         break;
     case QNetworkSession::Connecting:
         s = s.arg(tr("Connecting"));
         break;
     case QNetworkSession::Connected:
         s = s.arg(tr("Connected"));
         break;
     case QNetworkSession::Closing:
         s = s.arg(tr("Closing"));
         break;
     case QNetworkSession::Disconnected:
         s = s.arg(tr("Disconnected"));
         break;
     case QNetworkSession::Roaming:
         s = s.arg(tr("Roaming"));
         break;
     default:
         s = s.arg(tr("Unknown"));
     }

     if (session->isOpen())
         s = s.arg(tr("Open"));
     else
         s = s.arg(tr("Closed"));

     tooltip += s;

     tooltip += tr("<br><br>Active time: %1 seconds").arg(session->activeTime());
     tooltip += tr("<br>Received data: %1 bytes").arg(session->bytesReceived());
     tooltip += tr("<br>Sent data: %1 bytes").arg(session->bytesWritten());

     setToolTip(tooltip);
 #else
     Q_UNUSED(state);
 #endif
 }

 void Cloud::newConfigurationActivated()
 {
     QNetworkConfiguration::BearerType bearerType = configuration.bearerType();
     if (!svgCache.contains(bearerType)) {
         QSvgRenderer *renderer = 0;
         switch (bearerType) {
         case QNetworkConfiguration::BearerWLAN:
             renderer = new QSvgRenderer(QLatin1String(":wlan.svg"));
             break;
         case QNetworkConfiguration::BearerEthernet:
             renderer = new QSvgRenderer(QLatin1String(":lan.svg"));
             break;
         case QNetworkConfiguration::Bearer2G:
             renderer = new QSvgRenderer(QLatin1String(":cell.svg"));
             break;
         case QNetworkConfiguration::BearerBluetooth:
             renderer = new QSvgRenderer(QLatin1String(":bluetooth.svg"));
             break;
         case QNetworkConfiguration::BearerCDMA2000:
         case QNetworkConfiguration::BearerWCDMA:
         case QNetworkConfiguration::BearerHSPA:
             renderer = new QSvgRenderer(QLatin1String(":umts.svg"));
             break;
         default:
             renderer = new QSvgRenderer(QLatin1String(":unknown.svg"));
         }

         if (renderer)
             svgCache.insert(bearerType, renderer);
     }

     icon->setSharedRenderer(svgCache[bearerType]);

     if (configuration.name().isEmpty()) {
         text->setPlainText(tr("HIDDEN NETWORK"));
     } else {
         if (configuration.type() == QNetworkConfiguration::ServiceNetwork)
             text->setHtml("<b>" + configuration.name() + "</b>");
         else
             text->setPlainText(configuration.name());
     }

     const qreal height = icon->boundingRect().height() + text->boundingRect().height();

     icon->setPos(icon->boundingRect().width() / -2, height / -2);

     text->setPos(text->boundingRect().width() / -2,
                  height / 2 - text->boundingRect().height());

     stateChanged(session->state());
 }

 qreal Cloud::getRadiusForState(QNetworkConfiguration::StateFlags state)
 {
     switch (state) {
     case QNetworkConfiguration::Active:
         return 100;
         break;
     case QNetworkConfiguration::Discovered:
         return 150;
         break;
     case QNetworkConfiguration::Defined:
         return 200;
         break;
     case QNetworkConfiguration::Undefined:
         return 250;
         break;
     default:
         return 300;
     }
 }

© 2008-2010 Nokia Corporation and/or its subsidiaries. Nokia, Qt and their respective logos are trademarks of Nokia Corporation in Finland and/or other countries worldwide.

All other trademarks are property of their respective owners. Privacy Policy


Licensees holding valid Qt Commercial licenses may use this document in accordance with the Qt Commercial License Agreement provided with the Software or, alternatively, in accordance with the terms contained in a written agreement between you and Nokia.

Alternatively, this document may be used under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation.

X

Thank you for giving your feedback.

Make sure it is related to this specific page. For more general bugs and requests, please use the Qt Bug Tracker.