C++ DataEngine::connectSource方法代码示例

void Clock::connectToEngine()
{
    resetLastTimeSeen();

    Plasma::DataEngine* timeEngine = dataEngine("time");
    timeEngine->disconnectSource(m_oldTimezone, this);
    m_oldTimezone = currentTimezone();

    if (m_showSecondHand) {
        timeEngine->connectSource(currentTimezone(), this, 500);
    } else {
        timeEngine->connectSource(currentTimezone(), this, 6000, Plasma::AlignToMinute);
    }
}

void WebBrowser::urlChanged(const QUrl &url)
{
    //ask for a favicon
    Plasma::DataEngine *engine = dataEngine( "favicons" );
    if (engine) {
        //engine->disconnectSource( url.toString(), this );
        engine->connectSource( url.toString(), this );

        engine->query( url.toString() );
    }

    m_url = KUrl(url);

    if (m_bookmarkModel->match(m_bookmarkModel->index(0,0), BookmarkItem::UrlRole, m_url.prettyUrl()).isEmpty()) {
        m_addBookmark->setAction(m_addBookmarkAction);
    } else {
        m_addBookmark->setAction(m_removeBookmarkAction);
    }

    m_nativeHistoryCombo->addToHistory(m_url.prettyUrl());
    m_nativeHistoryCombo->setCurrentIndex(0);

    m_go->setAction(m_reloadAction);

    KConfigGroup cg = config();
    saveState(cg);

    m_back->setEnabled(m_browser->page()->history()->canGoBack());
    m_forward->setEnabled(m_browser->page()->history()->canGoForward());
    setAssociatedApplicationUrls(KUrl(url));
}

void Clock::changeEngineTimezone(const QString &oldTimezone, const QString &newTimezone)
{
    dataEngine("time")->disconnectSource(oldTimezone, this);
    Plasma::DataEngine* timeEngine = dataEngine("time");

    if (m_showSecondHand) {
        timeEngine->connectSource(newTimezone, this, 500);
    } else {
        timeEngine->connectSource(newTimezone, this, 6000, Plasma::AlignToMinute);
    }

    if (m_showingTimezone != (m_showTimezoneString || shouldDisplayTimezone())) {
        m_showingTimezone = !m_showingTimezone;
        constraintsEvent(Plasma::SizeConstraint);
    }
    m_repaintCache = RepaintAll;
}

void
PhotosApplet::init()
{
    DEBUG_BLOCK

    // Call the base implementation.
    Context::Applet::init();

    // Create label
    enableHeader( true );
    setHeaderText( i18n( "Photos" ) );

    // Set the collapse size
    setCollapseHeight( m_header->height() );
    setCollapseOffHeight( 220 );
    setMaximumHeight( 220 );
    setMinimumHeight( collapseHeight() );
    setPreferredHeight( collapseHeight() );

    // Icon
    QAction* settingsAction = new QAction( this );
    settingsAction->setIcon( KIcon( "preferences-system" ) );
    settingsAction->setVisible( true );
    settingsAction->setEnabled( true );
    settingsAction->setText( i18n( "Settings" ) );
    m_settingsIcon = addRightHeaderAction( settingsAction );
    connect( m_settingsIcon, SIGNAL( clicked() ), this, SLOT( showConfigurationInterface() ) );

    m_widget = new PhotosScrollWidget( this );
    m_widget->setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
    m_widget->setContentsMargins( 0, 0, 0, 0 );
    connect( m_widget, SIGNAL(photoAdded()), SLOT(photoAdded()) );

    QGraphicsLinearLayout *layout = new QGraphicsLinearLayout( Qt::Vertical, this );
    layout->addItem( m_header );
    layout->addItem( m_widget );

    // Read config and inform the engine.
    KConfigGroup config = Amarok::config("Photos Applet");
    m_nbPhotos = config.readEntry( "NbPhotos", "10" ).toInt();
    m_Animation = config.readEntry( "Animation", "Fading" );
    m_KeyWords = config.readEntry( "KeyWords", QStringList() );

    if( m_Animation == i18nc( "animation type", "Automatic" ) )
        m_widget->setMode( 0 );
    else if( m_Animation == i18n( "Interactive" ) )
        m_widget->setMode( 1 );
    else // fading
        m_widget->setMode( 2 );

    Plasma::DataEngine *engine = dataEngine( "amarok-photos" );
    engine->setProperty( "fetchSize", m_nbPhotos );
    engine->setProperty( "keywords", m_KeyWords );
    engine->connectSource( "photos", this );
}

/**
 * \brief Initialization
 *
 * Initializes the TabsApplet with default parameters
 */
void
TabsApplet::init()
{
    // applet base initialization
    Context::Applet::init();

    // create the header label
    enableHeader( true );
    setHeaderText( i18nc( "Guitar tablature", "Tabs" ) );

    // creates the tab view
    m_tabsView = new TabsView( this );

    // Set the collapse size
    setCollapseOffHeight( -1 );
    setCollapseHeight( m_header->height() );
    setMinimumHeight( collapseHeight() );
    setPreferredHeight( collapseHeight() );

    // create the reload icon
    QAction* reloadAction = new QAction( this );
    reloadAction->setIcon( KIcon( "view-refresh" ) );
    reloadAction->setVisible( true );
    reloadAction->setEnabled( true );
    reloadAction->setText( i18nc( "Guitar tablature", "Reload tabs" ) );
    m_reloadIcon = addLeftHeaderAction( reloadAction );
    m_reloadIcon.data()->setEnabled( false );
    connect( m_reloadIcon.data(), SIGNAL(clicked()), this, SLOT(reloadTabs()) );

    // create the settings icon
    QAction* settingsAction = new QAction( this );
    settingsAction->setIcon( KIcon( "preferences-system" ) );
    settingsAction->setEnabled( true );
    settingsAction->setText( i18n( "Settings" ) );
    QWeakPointer<Plasma::IconWidget> settingsIcon = addRightHeaderAction( settingsAction );
    connect( settingsIcon.data(), SIGNAL(clicked()), this, SLOT(showConfigurationInterface()) );

    m_layout = new QGraphicsLinearLayout( Qt::Vertical );
    m_layout->addItem( m_header );
    m_layout->addItem( m_tabsView );
    setLayout( m_layout );

    // read configuration data and update the engine.
    KConfigGroup config = Amarok::config("Tabs Applet");
    m_fetchGuitar = config.readEntry( "FetchGuitar", true );
    m_fetchBass = config.readEntry( "FetchBass", true );

    Plasma::DataEngine *engine = dataEngine( "amarok-tabs" );
    engine->setProperty( "fetchGuitarTabs", m_fetchGuitar );
    engine->setProperty( "fetchBassTabs", m_fetchBass );
    engine->connectSource( "tabs", this );

    updateInterface( InitState );
}

void PoTD::dataUpdated(const QString &source, const Plasma::DataEngine::Data &data)
{
    if (source == QLatin1String("Providers")) {
        m_providers = data;
        if (!m_provider.isEmpty() && !m_providers.contains(m_provider)) {
            Plasma::DataEngine *engine = dataEngine(QLatin1String("potd"));
            engine->disconnectSource(m_provider, this);
            m_provider = DEFAULT_PROVIDER;
            engine->connectSource(m_provider, this);
        }
    } else if (source == m_provider) {
        QImage image = data["Image"].value<QImage>();
        render(image, boundingRect().size().toSize(), MaxpectResize);
    } else {
        dataEngine(QLatin1String("potd"))->disconnectSource(source, 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 PoTD::paint(QPainter *painter, const QRectF& exposedRect)
{
    if (m_image.isNull()) {
        painter->fillRect(exposedRect, QBrush(Qt::black));
        const QString provider = m_providers.isEmpty() || m_provider.isEmpty() ? QString()
                                                                               : m_providers.value(m_provider).toString();
        const QString text = provider.isEmpty() ? i18n("Loading the picture of the day...")
                                                : i18n("Loading the picture of the day from %1...", provider);
        QRect textRect = painter->fontMetrics().boundingRect(text);
        textRect.moveCenter(boundingRect().center().toPoint());
        painter->setPen(Qt::white);
        painter->drawText(textRect.topLeft(), text);
    } else {
        if (m_image.size() != boundingRect().size().toSize()) {
            Plasma::DataEngine *engine = dataEngine(QLatin1String("potd"));
            // refresh the data which will trigger a re-render
            engine->disconnectSource(m_provider, this);
            engine->connectSource(m_provider, this);
        }
        painter->drawImage(exposedRect, m_image, exposedRect);
    }
}

void Luna::connectToEngine()
{
    Plasma::DataEngine* timeEngine = dataEngine("time");
    timeEngine->connectSource("UTC", this, 360000, Plasma::AlignToHour);
}

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);
}