Qt Reference Documentation

# settingsdialog.cpp Example File

demos/spectrum/app/settingsdialog.cpp

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     #include "settingsdialog.h"
     #include <QComboBox>
     #include <QDialogButtonBox>
     #include <QLabel>
     #include <QPushButton>
     #include <QVBoxLayout>
     #include <QCheckBox>
     #include <QSlider>
     #include <QSpinBox>

     SettingsDialog::SettingsDialog(
                 const QList<QAudioDeviceInfo> &availableInputDevices,
                 const QList<QAudioDeviceInfo> &availableOutputDevices,
                 QWidget *parent)
         :   QDialog(parent)
         ,   m_windowFunction(DefaultWindowFunction)
         ,   m_inputDeviceComboBox(new QComboBox(this))
         ,   m_outputDeviceComboBox(new QComboBox(this))
         ,   m_windowFunctionComboBox(new QComboBox(this))
     {
         QVBoxLayout *dialogLayout = new QVBoxLayout(this);

         // Populate combo boxes

         QAudioDeviceInfo device;
         foreach (device, availableInputDevices)
             m_inputDeviceComboBox->addItem(device.deviceName(),
                                            QVariant::fromValue(device));
         foreach (device, availableOutputDevices)
             m_outputDeviceComboBox->addItem(device.deviceName(),
                                            QVariant::fromValue(device));

         m_windowFunctionComboBox->addItem(tr("None"), QVariant::fromValue(int(NoWindow)));
         m_windowFunctionComboBox->addItem("Hann", QVariant::fromValue(int(HannWindow)));
         m_windowFunctionComboBox->setCurrentIndex(m_windowFunction);

         // Initialize default devices
         if (!availableInputDevices.empty())
             m_inputDevice = availableInputDevices.front();
         if (!availableOutputDevices.empty())
             m_outputDevice = availableOutputDevices.front();

         // Add widgets to layout

         QScopedPointer<QHBoxLayout> inputDeviceLayout(new QHBoxLayout);
         QLabel *inputDeviceLabel = new QLabel(tr("Input device"), this);
         inputDeviceLayout->addWidget(inputDeviceLabel);
         inputDeviceLayout->addWidget(m_inputDeviceComboBox);
         dialogLayout->addLayout(inputDeviceLayout.data());
         inputDeviceLayout.take(); // ownership transferred to dialogLayout

         QScopedPointer<QHBoxLayout> outputDeviceLayout(new QHBoxLayout);
         QLabel *outputDeviceLabel = new QLabel(tr("Output device"), this);
         outputDeviceLayout->addWidget(outputDeviceLabel);
         outputDeviceLayout->addWidget(m_outputDeviceComboBox);
         dialogLayout->addLayout(outputDeviceLayout.data());
         outputDeviceLayout.take(); // ownership transferred to dialogLayout

         QScopedPointer<QHBoxLayout> windowFunctionLayout(new QHBoxLayout);
         QLabel *windowFunctionLabel = new QLabel(tr("Window function"), this);
         windowFunctionLayout->addWidget(windowFunctionLabel);
         windowFunctionLayout->addWidget(m_windowFunctionComboBox);
         dialogLayout->addLayout(windowFunctionLayout.data());
         windowFunctionLayout.take(); // ownership transferred to dialogLayout

         // Connect
         CHECKED_CONNECT(m_inputDeviceComboBox, SIGNAL(activated(int)),
                         this, SLOT(inputDeviceChanged(int)));
         CHECKED_CONNECT(m_outputDeviceComboBox, SIGNAL(activated(int)),
                         this, SLOT(outputDeviceChanged(int)));
         CHECKED_CONNECT(m_windowFunctionComboBox, SIGNAL(activated(int)),
                         this, SLOT(windowFunctionChanged(int)));

         // Add standard buttons to layout
         QDialogButtonBox *buttonBox = new QDialogButtonBox(this);
         buttonBox->setStandardButtons(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
         dialogLayout->addWidget(buttonBox);

         // Connect standard buttons
         CHECKED_CONNECT(buttonBox->button(QDialogButtonBox::Ok), SIGNAL(clicked()),
                         this, SLOT(accept()));
         CHECKED_CONNECT(buttonBox->button(QDialogButtonBox::Cancel), SIGNAL(clicked()),
                         this, SLOT(reject()));

         setLayout(dialogLayout);
     }

     SettingsDialog::~SettingsDialog()
     {

     }

     void SettingsDialog::windowFunctionChanged(int index)
     {
         m_windowFunction = static_cast<WindowFunction>(
                 m_windowFunctionComboBox->itemData(index).value<int>());
     }

     void SettingsDialog::inputDeviceChanged(int index)
     {
         m_inputDevice = m_inputDeviceComboBox->itemData(index).value<QAudioDeviceInfo>();
     }

     void SettingsDialog::outputDeviceChanged(int index)
     {
         m_outputDevice = m_outputDeviceComboBox->itemData(index).value<QAudioDeviceInfo>();
     }