- Qt 5.5
- Qt Multimedia
- Spectrum Example
- tonegeneratordialog.cpp Example File
- Qt 5.5.1 Reference Documentation

# tonegeneratordialog.cpp Example File

spectrum/app/tonegeneratordialog.cpp

    /****************************************************************************
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    ** This file is part of the examples of the Qt Toolkit.
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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);
    }