Qt 5.9 | Qt Multimedia | Spectrum Example | tonegeneratordialog.cpp Example File

Qt 5.9.4 Reference Documentation

# tonegeneratordialog.cpp Example File

multimedia/spectrum/app/tonegeneratordialog.cpp

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

      const int ToneGeneratorFreqMin = 1;
      const int ToneGeneratorFreqMax = 1000;
      const int ToneGeneratorFreqDefault = 440;
      const int ToneGeneratorAmplitudeDefault = 75;

      ToneGeneratorDialog::ToneGeneratorDialog(QWidget *parent)
          :   QDialog(parent)
          ,   m_toneGeneratorSweepCheckBox(new QCheckBox(tr("Frequency sweep"), this))
          ,   m_frequencySweepEnabled(true)
          ,   m_toneGeneratorControl(new QWidget(this))
          ,   m_toneGeneratorFrequencyControl(new QWidget(this))
          ,   m_frequencySlider(new QSlider(Qt::Horizontal, this))
          ,   m_frequencySpinBox(new QSpinBox(this))
          ,   m_frequency(ToneGeneratorFreqDefault)
          ,   m_amplitudeSlider(new QSlider(Qt::Horizontal, this))
      {
          QVBoxLayout *dialogLayout = new QVBoxLayout(this);

          m_toneGeneratorSweepCheckBox->setChecked(true);

          // Configure tone generator controls
          m_frequencySlider->setRange(ToneGeneratorFreqMin, ToneGeneratorFreqMax);
          m_frequencySlider->setValue(ToneGeneratorFreqDefault);
          m_frequencySpinBox->setRange(ToneGeneratorFreqMin, ToneGeneratorFreqMax);
          m_frequencySpinBox->setValue(ToneGeneratorFreqDefault);
          m_amplitudeSlider->setRange(0, 100);
          m_amplitudeSlider->setValue(ToneGeneratorAmplitudeDefault);

          // Add widgets to layout
          QGridLayout *frequencyControlLayout = new QGridLayout;
          QLabel *frequencyLabel = new QLabel(tr("Frequency (Hz)"), this);
          frequencyControlLayout->addWidget(frequencyLabel, 0, 0, 2, 1);
          frequencyControlLayout->addWidget(m_frequencySlider, 0, 1);
          frequencyControlLayout->addWidget(m_frequencySpinBox, 1, 1);
          m_toneGeneratorFrequencyControl->setLayout(frequencyControlLayout);
          m_toneGeneratorFrequencyControl->setEnabled(false);

          QGridLayout *toneGeneratorLayout = new QGridLayout;
          QLabel *amplitudeLabel = new QLabel(tr("Amplitude"), this);
          toneGeneratorLayout->addWidget(m_toneGeneratorSweepCheckBox, 0, 1);
          toneGeneratorLayout->addWidget(m_toneGeneratorFrequencyControl, 1, 0, 1, 2);
          toneGeneratorLayout->addWidget(amplitudeLabel, 2, 0);
          toneGeneratorLayout->addWidget(m_amplitudeSlider, 2, 1);
          m_toneGeneratorControl->setLayout(toneGeneratorLayout);
          m_toneGeneratorControl->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
          dialogLayout->addWidget(m_toneGeneratorControl);

          // Connect
          CHECKED_CONNECT(m_toneGeneratorSweepCheckBox, SIGNAL(toggled(bool)),
                          this, SLOT(frequencySweepEnabled(bool)));
          CHECKED_CONNECT(m_frequencySlider, SIGNAL(valueChanged(int)),
                          m_frequencySpinBox, SLOT(setValue(int)));
          CHECKED_CONNECT(m_frequencySpinBox, SIGNAL(valueChanged(int)),
                          m_frequencySlider, SLOT(setValue(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);
      }

      ToneGeneratorDialog::~ToneGeneratorDialog()
      {

      }

      bool ToneGeneratorDialog::isFrequencySweepEnabled() const
      {
          return m_toneGeneratorSweepCheckBox->isChecked();
      }

      qreal ToneGeneratorDialog::frequency() const
      {
          return qreal(m_frequencySlider->value());
      }

      qreal ToneGeneratorDialog::amplitude() const
      {
          return qreal(m_amplitudeSlider->value()) / 100.0;
      }

      void ToneGeneratorDialog::frequencySweepEnabled(bool enabled)
      {
          m_frequencySweepEnabled = enabled;
          m_toneGeneratorFrequencyControl->setEnabled(!enabled);
      }