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(),
                                        qVariantFromValue(device));
     foreach (device, availableOutputDevices)
         m_outputDeviceComboBox->addItem(device.deviceName(),
                                        qVariantFromValue(device));

     m_windowFunctionComboBox->addItem(tr("None"), qVariantFromValue(int(NoWindow)));
     m_windowFunctionComboBox->addItem("Hann", qVariantFromValue(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>();
 }
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