Qt Reference Documentation

# tonegeneratordialog.cpp Example File

demos/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

         QScopedPointer<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.data());
         frequencyControlLayout.take(); // ownership transferred to m_toneGeneratorFrequencyControl
         m_toneGeneratorFrequencyControl->setEnabled(false);

         QScopedPointer<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.data());
         m_toneGeneratorControl->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
         dialogLayout->addWidget(m_toneGeneratorControl);
         toneGeneratorLayout.take(); // ownership transferred

         // 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);
     }