cloud.cpp Example File
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<QString, 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->isActive())
                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;

        QString tooltip;

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

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

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

        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->isActive())
            s = s.arg(tr("Active"));
        else
            s = s.arg(tr("Inactive"));

        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);
    }

    void Cloud::newConfigurationActivated()
    {
        const QString bearerName = session->bearerName();
        if (!svgCache.contains(bearerName)) {
            if (bearerName == QLatin1String("WLAN"))
                svgCache.insert(bearerName, new QSvgRenderer(QLatin1String(":wlan.svg")));
            else if (bearerName == QLatin1String("Ethernet"))
                svgCache.insert(bearerName, new QSvgRenderer(QLatin1String(":lan.svg")));
            else
                svgCache.insert(bearerName, new QSvgRenderer(QLatin1String(":unknown.svg")));
        }

        icon->setSharedRenderer(svgCache[bearerName]);

        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;
        }
    }