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

# settingsdialog.cpp Example File

spectrum/app/settingsdialog.cpp

    /****************************************************************************
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    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
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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
        CHECKED_CONNECT(m_inputDeviceComboBox, SIGNAL(activated(int)),
                        this, SLOT(inputDeviceChanged(int)));
        CHECKED_CONNECT(m_outputDeviceComboBox, SIGNAL(activated(int)),
                        this, SLOT(outputDeviceChanged(int)));
        CHECKED_CONNECT(m_windowFunctionComboBox, SIGNAL(activated(int)),
                        this, SLOT(windowFunctionChanged(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);
    }

    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>();
    }