Qt Reference Documentation

cloud.cpp Example File

network/bearercloud/cloud.cpp
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 #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;
         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;
     }
 }
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