C++ DataEngine::isValid方法代码示例

void ControlWidget::DisconnectSource()
{
    Plasma::DataEngine* engine = m_parent->getDataEngine();
    if (engine && engine->isValid())
    {
        Logger::Log(DEBUG, "Disconnecting source %s", m_unit.address());
        engine->disconnectSource(m_unit.address(), this);
    }
}

void ControlWidget::ConnectSource()
{
    Plasma::DataEngine* engine = m_parent->getDataEngine();
    if (engine && engine->isValid())
    {
        Logger::Log(DEBUG, "Connecting source %s", m_unit.address());
        engine->connectSource(m_unit.address(), this, 0);

        m_serviceUnit = engine->serviceForSource(m_unit.address());
        if (!m_serviceUnit)
            Logger::Log(ERROR, "Connecting source %s: Null Service", m_unit.address());
    }
    else
    {
        Logger::Log(ERROR, "Connecting source %s: Null Data Engine", m_unit.address());
        m_serviceUnit = 0;
    }
}

void RtdScheduleApplet::init()
{
    QString sourceName = QLatin1String("NextStops [B/BF/BX-E:Broadway - 16th St (University of Colorado)"
                                       ",DASH-E:Broadway - 16th St (University of Colorado)"
                                       ",204-S:Broadway - 16th St (University of Colorado)"
                                       ",AB-E:Broadway - 16th St (University of Colorado)"
                                       "] 4");

// NextStops [B/BF/BX-E:Broadway - 16th St (University of Colorado),DASH-E:Broadway - 16th St (University of Colorado),204-S:Broadway - 16th St (University of Colorado),AB-E:Broadway - 16th St (University of Colorado)] 4 TEXT
    Plasma::DataEngine *de = dataEngine("rtddenver");
    if (!de->isValid()) {
        setFailedToLaunch(true, i18n("Cannot connect to RTD Denver data engine"));
        return;
    }

    setBusy(true);
    de->connectSource(sourceName, this, 60*1000, Plasma::AlignToMinute);
}

void SwitchWindow::makeMenu()
{
    m_menu->clear();
    Plasma::DataEngine *tasks = dataEngine("tasks");
    if (!tasks->isValid()) {
        return;
    }

    QMultiHash<int, QAction*> desktops;

    //make all the window actions
    foreach (const QString &source, tasks->sources()) {
        Plasma::DataEngine::Data window = tasks->query(source);
        if (window.value("startup").toBool()) {
            //kDebug() << "skipped fake task" << source;
            continue;
        }
        if (!window.value("onCurrentActivity").toBool()) {
            continue;
        }

        QString name = window.value("visibleNameWithState").toString();
        if (name.isEmpty()) {
            kDebug() << "failed source" << source;
            continue;
        }

        QAction *action = new QAction(name, m_menu);
        action->setIcon(window.value("icon").value<QIcon>());
        action->setData(source);
        desktops.insert(window.value("desktop").toInt(), action);
    }

    //sort into menu
    if (m_mode == CurrentDesktop) {
        int currentDesktop = KWindowSystem::currentDesktop();
        m_menu->addTitle(i18n("Windows"));
        m_menu->addActions(desktops.values(currentDesktop));
        m_menu->addActions(desktops.values(-1));
    } else {
        int numDesktops = KWindowSystem::numberOfDesktops();
        if (m_mode == AllFlat) {
            for (int i = 1; i <= numDesktops; ++i) {
                if (desktops.contains(i)) {
                    QString name = KWindowSystem::desktopName(i);
                    name = QString("%1: %2").arg(i).arg(name);
                    m_menu->addTitle(name);
                    m_menu->addActions(desktops.values(i));
                }
            }
            if (desktops.contains(-1)) {
                m_menu->addTitle(i18n("All Desktops"));
                m_menu->addActions(desktops.values(-1));
            }
        } else { //submenus
            for (int i = 1; i <= numDesktops; ++i) {
                if (desktops.contains(i)) {
                        QString name = KWindowSystem::desktopName(i);
                        name = QString("%1: %2").arg(i).arg(name);
                        KMenu *subMenu = new KMenu(name, m_menu);
                        subMenu->addActions(desktops.values(i));
                        m_menu->addMenu(subMenu);
                }
            }
            if (desktops.contains(-1)) {
                KMenu *subMenu = new KMenu(i18n("All Desktops"), m_menu);
                subMenu->addActions(desktops.values(-1));
                m_menu->addMenu(subMenu);
            }
        }
    }

    m_menu->adjustSize();
}

void WicdApplet::init()
{
    m_theme->resize(contentsRect().size());
    
    Plasma::ToolTipManager::self()->registerWidget(this);

    //load dataengine
    Plasma::DataEngine *engine = dataEngine("wicd");
    if (!engine->isValid()) {
        setFailedToLaunch(true, i18n("Unable to load the Wicd data engine."));
        return;
    }
    
    setupActions();
    
    //build the popup dialog
    QGraphicsWidget *appletDialog = new QGraphicsWidget(this);
    m_dialoglayout = new QGraphicsLinearLayout(Qt::Vertical);
    
    //Network list
    m_scrollWidget = new Plasma::ScrollWidget(appletDialog);
    m_scrollWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    m_scrollWidget->setFlag(QGraphicsItem::ItemClipsChildrenToShape);
    m_scrollWidget->setMaximumHeight(400);

    m_networkView = new NetworkView(m_scrollWidget);
    m_scrollWidget->setWidget(m_networkView);

    m_busyWidget = new Plasma::BusyWidget(m_scrollWidget);
    m_busyWidget->hide();

    m_dialoglayout->addItem(m_scrollWidget);
    
    //Separator
    m_dialoglayout->addItem(new Plasma::Separator(appletDialog));
    
    //Bottom bar
    QGraphicsLinearLayout* bottombarLayout = new QGraphicsLinearLayout(Qt::Horizontal);
    
    m_messageBox = new Plasma::Label(appletDialog);
    m_messageBox->setWordWrap(false);
    bottombarLayout->addItem(m_messageBox);
    
    bottombarLayout->addStretch();
    
    m_abortButton = new Plasma::ToolButton(appletDialog);
    m_abortButton->setIcon(KIcon("dialog-cancel"));
    m_abortButton->nativeWidget()->setToolTip(i18n("Abort"));
    connect(m_abortButton, SIGNAL(clicked()), this, SLOT(cancelConnect()));
    bottombarLayout->addItem(m_abortButton);
    
    Plasma::ToolButton *reloadButton = new Plasma::ToolButton(appletDialog);
    reloadButton->nativeWidget()->setToolTip(i18n("Reload"));
    reloadButton->setAction(action("reload"));
    bottombarLayout->addItem(reloadButton);
    
    m_dialoglayout->addItem(bottombarLayout);
    
    appletDialog->setLayout(m_dialoglayout);
    setGraphicsWidget(appletDialog);

    setHasConfigurationInterface(true);
    
    // read config
    configChanged();

    connect(Plasma::Theme::defaultTheme(), SIGNAL(themeChanged()), SLOT(updateColors()));


    //prevent notification on startup
    m_status.State = 10;
    m_isScanning = false;
    //connect dataengine
    m_wicdService = engine->serviceForSource("");
    engine->connectSource("status", this);
    engine->connectSource("daemon", this);
}