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;
             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;
         }
     }