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);
 }
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