// reset actions

    connect(&resetAct, &QAction::triggered, model, &ChannelInfoModel::resetInfos);

    connect(&resetNamesAct, &QAction::triggered, model, &ChannelInfoModel::resetNames);

    connect(&resetColorsAct, &QAction::triggered, model, &ChannelInfoModel::resetColors);

    connect(&showAllAct, &QAction::triggered, model, &ChannelInfoModel::resetVisibility);

}

void PlotControlPanel::saveSettings(QSettings* settings)

{

    settings->beginGroup(SettingGroup_Plot);

    settings->setValue(SG_Plot_NumOfSamples, numOfSamples());

    settings->setValue(SG_Plot_IndexAsX, xAxisAsIndex());

    settings->setValue(SG_Plot_XMax, xMax());

    settings->setValue(SG_Plot_XMin, xMin());

    settings->setValue(SG_Plot_AutoScale, autoScale());

    settings->setValue(SG_Plot_YMax, yMax());

    settings->setValue(SG_Plot_YMin, yMin());

    settings->endGroup();

}

void PlotControlPanel::loadSettings(QSettings* settings)

{

    settings->beginGroup(SettingGroup_Plot);

    ui->spNumOfSamples->setValue(

        settings->value(SG_Plot_NumOfSamples, numOfSamples()).toInt());

    ui->cbIndex->setChecked(

        settings->value(SG_Plot_IndexAsX, xAxisAsIndex()).toBool());

    ui->spXmax->setValue(settings->value(SG_Plot_XMax, xMax()).toDouble());

    ui->spXmin->setValue(settings->value(SG_Plot_XMin, xMin()).toDouble());

    ui->cbAutoScale->setChecked(

        settings->value(SG_Plot_AutoScale, autoScale()).toBool());

    ui->spYmax->setValue(settings->value(SG_Plot_YMax, yMax()).toDouble());

    ui->spYmin->setValue(settings->value(SG_Plot_YMin, yMin()).toDouble());

    settings->endGroup();

}

public:

    explicit PlotControlPanel(QWidget *parent = 0);

    ~PlotControlPanel();

    unsigned numOfSamples();

    bool   autoScale() const;

    double yMax() const;

    double yMin() const;

    bool   xAxisAsIndex() const;

    double xMax() const;

    double xMin() const;

    double plotWidth() const;

    void setChannelInfoModel(ChannelInfoModel* model);

    /// Stores plot settings into a `QSettings`

    void saveSettings(QSettings* settings);

    /// Loads plot settings from a `QSettings`.

    void loadSettings(QSettings* settings);

signals:

    void numOfSamplesChanged(int value);

    void yScaleChanged(bool autoScaled, double yMin = 0, double yMax = 1);

const char SG_CustomFrame_Endianness[] = "endianness";

const char SG_CustomFrame_Checksum[] = "checksum";

const char SG_CustomFrame_DebugMode[] = "debugMode";

// channel manager keys

const char SG_Channels_Channel[] = "channel";

const char SG_Channels_Name[] = "name";

const char SG_Channels_Color[] = "color";

const char SG_Channels_Visible[] = "visible";

// plot settings keys

const char SG_Plot_NumOfSamples[] = "numOfSamples";

const char SG_Plot_IndexAsX[] = "indexAsX";

const char SG_Plot_XMax[] = "xMax";

const char SG_Plot_XMin[] = "xMin";

const char SG_Plot_AutoScale[] = "autoScale";

const char SG_Plot_YMax[] = "yMax";

const char SG_Plot_YMin[] = "yMin";

const char SG_Plot_DarkBackground[] = "darkBackground";

const char SG_Plot_Grid[] = "grid";

const char SG_Plot_MinorGrid[] = "minorGrid";

const char SG_Plot_Legend[] = "legend";

const char SG_Plot_MultiPlot[] = "multiPlot";

const char SG_Plot_Symbols[] = "symbols";