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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);
     }