Qt 5.11 | Qt Multimedia | Spectrum Example | settingsdialog.cpp Example File

Qt 5.11.3 Reference Documentation

# settingsdialog.cpp Example File

multimedia/spectrum/app/settingsdialog.cpp

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

      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
          connect(m_inputDeviceComboBox, QOverload<int>::of(&QComboBox::activated),
                  this, &SettingsDialog::inputDeviceChanged);
          connect(m_outputDeviceComboBox, QOverload<int>::of(&QComboBox::activated),
                  this, &SettingsDialog::outputDeviceChanged);
          connect(m_windowFunctionComboBox, QOverload<int>::of(&QComboBox::activated),
                  this, &SettingsDialog::windowFunctionChanged);

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

          // Connect standard buttons
          connect(buttonBox->button(QDialogButtonBox::Ok), &QPushButton::clicked,
                  this, &SettingsDialog::accept);
          connect(buttonBox->button(QDialogButtonBox::Cancel), &QPushButton::clicked,
                  this, &SettingsDialog::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>();
      }