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window.cpp Example File
phonon/capabilities/window.cpp

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 #include <QtGui>

 #include "window.h"

 Window::Window()
 {
     setupUi();
     updateWidgets();

     connect(Phonon::BackendCapabilities::notifier(),
             SIGNAL(capabilitiesChanged()), this, SLOT(updateWidgets()));
     connect(Phonon::BackendCapabilities::notifier(),
             SIGNAL(availableAudioOutputDevicesChanged()), SLOT(updateWidgets()));
 }

 void Window::updateWidgets()
 {
     devicesListView->setModel(new QStandardItemModel());
     Phonon::ObjectDescriptionModel<Phonon::AudioOutputDeviceType> *model =
             new Phonon::ObjectDescriptionModel<Phonon::AudioOutputDeviceType>();
     model->setModelData(Phonon::BackendCapabilities::availableAudioOutputDevices());
     devicesListView->setModel(model);

     mimeListWidget->clear();
     QStringList mimeTypes =
             Phonon::BackendCapabilities::availableMimeTypes();
     foreach (QString mimeType, mimeTypes) {
         QListWidgetItem *item = new QListWidgetItem(mimeListWidget);
         item->setText(mimeType);
     }

     effectsTreeWidget->clear();
     QList<Phonon::EffectDescription> effects =
         Phonon::BackendCapabilities::availableAudioEffects();
     foreach (Phonon::EffectDescription effect, effects) {
         QTreeWidgetItem *item = new QTreeWidgetItem(effectsTreeWidget);
         item->setText(0, tr("Effect"));
         item->setText(1, effect.name());
         item->setText(2, effect.description());

         Phonon::Effect *instance = new Phonon::Effect(effect, this);
         QList<Phonon::EffectParameter> parameters = instance->parameters();
         for (int i = 0; i < parameters.size(); ++i) {
                 Phonon::EffectParameter parameter = parameters.at(i);

             QVariant defaultValue = parameter.defaultValue();
             QVariant minimumValue = parameter.minimumValue();
             QVariant maximumValue = parameter.maximumValue();

             QString valueString = QString("%1 / %2 / %3")
                     .arg(defaultValue.toString()).arg(minimumValue.toString())
                     .arg(maximumValue.toString());

             QTreeWidgetItem *parameterItem = new QTreeWidgetItem(item);
             parameterItem->setText(0, tr("Parameter"));
             parameterItem->setText(1, parameter.name());
             parameterItem->setText(2, parameter.description());
             parameterItem->setText(3, QVariant::typeToName(parameter.type()));
             parameterItem->setText(4, valueString);
         }
     }
     for (int i = 0; i < effectsTreeWidget->columnCount(); ++i) {
         if (i == 0)
             effectsTreeWidget->setColumnWidth(0, 150);
         else if (i == 2)
             effectsTreeWidget->setColumnWidth(2, 350);
         else
             effectsTreeWidget->resizeColumnToContents(i);
     }
 }

 void Window::setupUi()
 {
     setupBackendBox();

     QLayout *layout = new QVBoxLayout;
     layout->addWidget(backendBox);

     setLayout(layout);
     setWindowTitle(tr("Backend Capabilities Example"));
 }

 void Window::setupBackendBox()
 {
     backendBox = new QGroupBox(tr("Backend Capabilities"));

     devicesLabel = new QLabel(tr("Available Audio Devices:"));
     devicesListView = new QListView;

     mimeTypesLabel = new QLabel(tr("Supported MIME Types:"));
     mimeListWidget = new QListWidget;

     effectsLabel = new QLabel(tr("Available Audio Effects:"));

     QStringList headerLabels;
     headerLabels << tr("Type") << tr("Name") << tr("Description") <<
                     tr("Value Type") << tr("Default/Min/Max Values");

     effectsTreeWidget = new QTreeWidget;
     effectsTreeWidget->setHeaderLabels(headerLabels);
     effectsTreeWidget->setColumnCount(5);

     QGridLayout *layout = new QGridLayout;
     layout->addWidget(devicesLabel, 0, 0);
     layout->addWidget(devicesListView, 1, 0);
     layout->addWidget(mimeTypesLabel, 0, 1);
     layout->addWidget(mimeListWidget, 1, 1);
     layout->addWidget(effectsLabel, 2, 0);
     layout->addWidget(effectsTreeWidget, 3, 0, 2, 2);
     layout->setRowStretch(3, 100);

     backendBox = new QGroupBox(tr("Backend Capabilities"));
     backendBox->setLayout(layout);
 }


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Qt 4.6.3