C++ plasma::DataEngine类代码示例

void
TabsApplet::saveSettings()
{
    DEBUG_BLOCK
    KConfigGroup config = Amarok::config("Tabs Applet");

    bool fetchGuitar = ui_Settings.cbFetchGuitar->isChecked();
    bool fetchBass = ui_Settings.cbFetchBass->isChecked();

    // check if any setting has changed
    bool forceUpdate = false;
    if( m_fetchGuitar != fetchGuitar || m_fetchBass != fetchBass )
        forceUpdate = true;

    if( forceUpdate )
    {
        m_fetchGuitar = fetchGuitar;
        m_fetchBass = fetchBass;

        config.writeEntry( "FetchGuitar", m_fetchGuitar );
        config.writeEntry( "FetchBass", m_fetchBass );

        Plasma::DataEngine *engine = dataEngine( "amarok-tabs" );
        engine->setProperty( "fetchGuitarTabs", m_fetchGuitar );
        engine->setProperty( "fetchBassTabs", m_fetchBass );
        engine->query( QLatin1String( "tabs:forceUpdate" ) );
    }
}

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 ClockApplet::updateTipContent()
{
    Plasma::ToolTipContent tipData;

    QString subText("<table>");
    QList<Plasma::DataEngine::Data> tzs;
    Plasma::DataEngine *engine = dataEngine("time");
    Plasma::DataEngine::Data data = engine->query("Local");
    const QDate localDate = data["Date"].toDate();
    const QString localTz = data["Timezone"].toString();
    tzs.append(data);
    bool highlightLocal = false;

    const bool hasEvents = d->calendarWidget ? d->calendarWidget->dateHasDetails(localDate) : false;
    tipData.setMainText(hasEvents ? i18n("Current Time and Events") : i18n("Current Time"));

    foreach (const QString &tz, d->selectedTimezones) {
        if (tz != "UTC") {
            highlightLocal = true;
        }

        data = engine->query(tz);
        tzs.append(data);
    }

    qSort(tzs.begin(), tzs.end(), sortTzByData);
    QDate currentDate;
    foreach (const Plasma::DataEngine::Data &data, tzs) {
        bool shouldHighlight = highlightLocal && (data["Timezone"].toString() == localTz);
        currentDate = d->addTzToTipText(subText, data, currentDate, shouldHighlight);
    }

/**
 * Loads an ion plugin given a plugin name found via KService.
 */
Plasma::DataEngine *WeatherEngine::loadIon(const QString& plugName)
{
    KPluginInfo foundPlugin;

    foreach(const KPluginInfo &info, Plasma::DataEngineManager::listEngineInfo("weatherengine")) {
        if (info.pluginName() == plugName) {
            foundPlugin = info;
            break;
        }
    }

    if (!foundPlugin.isValid()) {
        return NULL;
    }

    // Load the Ion plugin, store it into a QMap to handle multiple ions.
    Plasma::DataEngine *ion = Plasma::DataEngineManager::self()->loadEngine(foundPlugin.pluginName());
    ion->setObjectName(plugName);
    connect(ion, SIGNAL(sourceAdded(QString)), this, SLOT(newIonSource(QString)));
    connect(ion, SIGNAL(forceUpdate(IonInterface*,QString)), this, SLOT(forceUpdate(IonInterface*,QString)));

    m_ions << plugName;

    return ion;
}

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
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 );
}

bool Hdd::addVisualization(const QString& source)
{
    Plasma::Meter *w;
    Plasma::DataEngine *engine = dataEngine("soliddevice");
    Plasma::DataEngine::Data data;

    if (!engine) {
        return false;
    }
    if (!isValidDevice(source, &data)) {
        // do not try to show hard drives and swap partitions.
        return false;
    }
    QGraphicsLinearLayout *layout = new QGraphicsLinearLayout(Qt::Horizontal);
    layout->setContentsMargins(3, 3, 3, 3);
    layout->setSpacing(5);

    w = new Plasma::Meter(this);
    w->setMeterType(Plasma::Meter::BarMeterHorizontal);
    if (mode() != SM::Applet::Panel) {
        MonitorIcon *icon = new MonitorIcon(this);
        m_icons.insert(source, icon);
        icon->setImage("drive-harddisk");
        if (data["Accessible"].toBool()) {
            QStringList overlays;
            overlays << QString("emblem-mounted");
            icon->setOverlays(overlays);
        }
        layout->addItem(icon);
    } else {
        w->setSvg("system-monitor/hdd_panel");
    }
    w->setLabel(0, hddTitle(source, data));
    w->setLabelAlignment(0, Qt::AlignVCenter | Qt::AlignLeft);
    w->setLabelAlignment(1, Qt::AlignVCenter | Qt::AlignRight);
    w->setLabelAlignment(2, Qt::AlignVCenter | Qt::AlignCenter);
    w->setMaximum(data["Size"].toULongLong() / (1024 * 1024));
    applyTheme(w);
    appendVisualization(source, w);
    layout->addItem(w);
    mainLayout()->addItem(layout);
    dataUpdated(source, data);
    setPreferredItemHeight(layout->preferredSize().height());

    QString disk = data["Parent UDI"].toString();

    m_diskMap[disk] << w;
    if (!connectedSources().contains(disk)) {
        data = engine->query(disk);
        dataUpdated(disk, data);
        connectSource(disk);
    }
    return true;
}

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 FdoSelectionManagerPrivate::createNotification(WId winId)
{
    if (!tasks.contains(winId)) {
        kDebug() << "message request from unknown task" << winId;
        return;
    }

    MessageRequest &request = messageRequests[winId];
    Task *task = tasks[winId];

    QString message = QString::fromUtf8(request.message);
    message = QTextDocument(message).toHtml();

    if (!notificationsEngine) {
        notificationsEngine = Plasma::DataEngineManager::self()->loadEngine("notifications");
    }
    //FIXME: who is the source in this case?
    Plasma::Service *service = notificationsEngine->serviceForSource("notification");
    KConfigGroup op = service->operationDescription("createNotification");

    if (op.isValid()) {
        op.writeEntry("appName", task->name());
        //FIXME: find a way to pass icons trough here
        op.writeEntry("appIcon", task->name());

        //op.writeEntry("summary", task->name());
        op.writeEntry("body", message);
        op.writeEntry("timeout", (int)request.timeout);
        KJob *job = service->startOperationCall(op);
        QObject::connect(job, SIGNAL(finished(KJob*)), service, SLOT(deleteLater()));
    } else {
        delete service;
        kDebug() << "invalid operation";
    }
}

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 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 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 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
PhotosApplet::saveSettings()
{
    DEBUG_BLOCK
    KConfigGroup config = Amarok::config("Photos Applet");

    m_nbPhotos = ui_Settings.photosSpinBox->value();
    m_Animation = ui_Settings.animationComboBox->currentText();
    m_KeyWords = ui_Settings.additionalkeywordsLineEdit->text().split(", ");
    config.writeEntry( "NbPhotos", m_nbPhotos );
    config.writeEntry( "Animation", m_Animation );
    config.writeEntry( "KeyWords", m_KeyWords );

    m_widget->setMode( ui_Settings.animationComboBox->currentIndex() );
    m_widget->clear();

    Plasma::DataEngine *engine = dataEngine( "amarok-photos" );
    engine->setProperty( "fetchSize", m_nbPhotos );
    engine->setProperty( "keywords", m_KeyWords );
    engine->query( QLatin1String( "photos:forceUpdate" ) );
}