Qt Reference Documentation

window.cpp Example File

phonon/capabilities/window.cpp
 /****************************************************************************
 **
 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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()
 {

 #if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
     devicesListView = new QListView;
     mimeListWidget = new QListWidget;

     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);

     QTabWidget *tabWidget = new QTabWidget;

     QWidget *widgetDevices = new QWidget;
     QVBoxLayout *devicesLayout = new QVBoxLayout;
     devicesLayout->addWidget(devicesListView);
     widgetDevices->setLayout(devicesLayout);

     QWidget *widgetMimes = new QWidget;
     QVBoxLayout *mimesLayout = new QVBoxLayout;
     mimesLayout->addWidget(mimeListWidget);
     widgetMimes->setLayout(mimesLayout);

     QWidget *widgetEffects = new QWidget;
     QVBoxLayout *effectsLayout = new QVBoxLayout;
     effectsLayout->addWidget(effectsTreeWidget);
     widgetEffects->setLayout(effectsLayout);

     tabWidget->addTab(widgetDevices, tr("Audio Devices"));
     tabWidget->addTab(widgetMimes, tr("MIME Types"));
     tabWidget->addTab(widgetEffects, tr("Audio Effects"));

     QLayout *mainLayout = new QVBoxLayout;
     mainLayout->addWidget(tabWidget);
 #else
     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);

     QLayout *mainLayout = new QVBoxLayout;
     mainLayout->addWidget(backendBox);
 #endif

     setLayout(mainLayout);
     setWindowTitle(tr("Backend Capabilities Example"));

 }