// make sure newly available channels are visible, we don't

    // remember visibility option intentionally so that user doesn't

    // get confused

    if (number > _numOfChannels)

    {

        for (unsigned ci = _numOfChannels; ci < number; ci++)

        {

            infos[ci].visibility = true;

        }

    }

    _numOfChannels = number;

    if (isInserting)

    {

        endInsertRows();

    }

    else

    {

        endRemoveRows();

    }

}

void ChannelInfoModel::saveSettings(QSettings* settings)

{

    settings->beginGroup(SettingGroup_Channels);

    settings->beginWriteArray(SG_Channels_Channel);

    // save all channel information regardless of current number of channels

    for (unsigned ci = 0; (int) ci < infos.length(); ci++)

    {

        settings->setArrayIndex(ci);

        settings->setValue(SG_Channels_Name, infos[ci].name);

        settings->setValue(SG_Channels_Color, infos[ci].color);

        settings->setValue(SG_Channels_Visible, infos[ci].visibility);

    }

    settings->endArray();

    settings->endGroup();

}

void ChannelInfoModel::loadSettings(QSettings* settings)

{

    settings->beginGroup(SettingGroup_Channels);

    unsigned size = settings->beginReadArray(SG_Channels_Channel);

    for (unsigned ci = 0; ci < size; ci++)

public:

    enum ChannelInfoColumn

    {

        COLUMN_NAME = 0,

        COLUMN_VISIBILITY,

        COLUMN_COUNT

    };

    explicit ChannelInfoModel(unsigned numberOfChannels, QObject *parent = 0);

    // implemented from QAbstractItemModel

    int           rowCount(const QModelIndex &parent = QModelIndex()) const;

    int           columnCount(const QModelIndex &parent = QModelIndex()) const;

    QVariant      data(const QModelIndex &index, int role = Qt::DisplayRole) const;

    bool          setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);

    Qt::ItemFlags flags(const QModelIndex &index) const;

    QVariant      headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;

    void setNumOfChannels(unsigned number);

    /// Stores all channel info into a `QSettings`

    void saveSettings(QSettings* settings);

    /// Loads all channel info from a `QSettings`.

    void loadSettings(QSettings* settings);

private:

    struct ChannelInfo

    {

        QString name;

        bool visibility;

        QColor color;

    };

    unsigned _numOfChannels;     ///< @note this is not necessarily the length of `infos`

    /**

     * Channel info is added here but never removed so that we can

     * remember user entered names.

     */

    QList<ChannelInfo> infos;

};

#endif // CHANNELINFOMODEL_H

#include <QMessageBox>

#include <QCheckBox>

#include <math.h>

#include "color_selector.hpp"

#include "plotcontrolpanel.h"

#include "ui_plotcontrolpanel.h"

#include "setting_defines.h"

/// Confirm if #samples is being set to a value greater than this

const int NUMSAMPLES_CONFIRM_AT = 10000;

/// Used for scale range selection combobox

struct Range

{

    double rmin;

    double rmax;

};

Q_DECLARE_METATYPE(Range);

PlotControlPanel::PlotControlPanel(QWidget *parent) :

    QWidget(parent),

{

    ui->setupUi(this);

    warnNumOfSamples = true;    // TODO: load from settings

    _numOfSamples = ui->spNumOfSamples->value();

    // set limits for axis limit boxes

    ui->spYmin->setRange((-1) * std::numeric_limits<double>::max(),

                         std::numeric_limits<double>::max());

    ui->spYmax->setRange((-1) * std::numeric_limits<double>::max(),

                         std::numeric_limits<double>::max());

    // connect signals

    connect(ui->spNumOfSamples, SIGNAL(valueChanged(int)),

            this, SLOT(onNumOfSamples(int)));

    connect(ui->cbAutoScale, &QCheckBox::toggled,

            this, &PlotControlPanel::onAutoScaleChecked);

    connect(ui->spYmax, SIGNAL(valueChanged(double)),

            this, SLOT(onYScaleChanged()));

    connect(ui->spYmin, SIGNAL(valueChanged(double)),

        Range r = {double(rmin),  double(rmax)};

        ui->cbRangePresets->addItem(

            QString().sprintf("Signed %d bits %d to +%d", nbits, rmin, rmax),

            QVariant::fromValue(r));

    }

    for (int nbits = 8; nbits <= 24; nbits++) // unsigned binary formats

    {

        int rmax = pow(2, nbits)-1;

        ui->cbRangePresets->addItem(

            QString().sprintf("Unsigned %d bits %d to +%d", nbits, 0, rmax),

            QVariant::fromValue(Range{0, double(rmax)}));

    }

    ui->cbRangePresets->addItem("-1 to +1", QVariant::fromValue(Range{-1, +1}));

    ui->cbRangePresets->addItem("0 to +1", QVariant::fromValue(Range{0, +1}));

    ui->cbRangePresets->addItem("-100 to +100", QVariant::fromValue(Range{-100, +100}));

    ui->cbRangePresets->addItem("0 to +100", QVariant::fromValue(Range{0, +100}));

    QObject::connect(ui->cbRangePresets, SIGNAL(activated(int)),

                     this, SLOT(onRangeSelected()));

    // color selector starts disabled until a channel is selected

    ui->colorSelector->setColor(QColor(0,0,0,0));

    ui->colorSelector->setDisplayMode(color_widgets::ColorPreview::AllAlpha);

    ui->colorSelector->setDisabled(true);

}

PlotControlPanel::~PlotControlPanel()

{

    delete ui;

}

unsigned PlotControlPanel::numOfSamples()

{

    return ui->spNumOfSamples->value();

}

void PlotControlPanel::onNumOfSamples(int value)

{

    if (warnNumOfSamples && value > NUMSAMPLES_CONFIRM_AT)

    {

        // ask confirmation

        if (!askNSConfirmation(value))

        {

            // revert to old value

            disconnect(ui->spNumOfSamples, SIGNAL(valueChanged(int)),

                       this, SLOT(onNumOfSamples(int)));

            ui->spNumOfSamples->setValue(_numOfSamples);

    connect(ui->colorSelector, &color_widgets::ColorSelector::colorChanged,

            [this](QColor color)

            {

                auto index = ui->tvChannelInfo->selectionModel()->currentIndex();

                ui->tvChannelInfo->model()->setData(index, color, Qt::ForegroundRole);

            });

    connect(model, &QAbstractItemModel::dataChanged,

            [this](const QModelIndex & topLeft, const QModelIndex & bottomRight, const QVector<int> & roles = QVector<int> ())

            {

                auto current = ui->tvChannelInfo->selectionModel()->currentIndex();

                // no current selection

                if (!current.isValid()) return;

                auto mod = ui->tvChannelInfo->model();

                QColor color = mod->data(current, Qt::ForegroundRole).value<QColor>();

                // temporarily block signals because `setColor` emits `colorChanged`

                bool wasBlocked = ui->colorSelector->blockSignals(true);

                ui->colorSelector->setColor(color);

                ui->colorSelector->blockSignals(wasBlocked);

            });

}

void PlotControlPanel::saveSettings(QSettings* settings)

{

    settings->beginGroup(SettingGroup_Plot);

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

    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->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();

}

/*

  Copyright © 2017 Hasan Yavuz Özderya

  This file is part of serialplot.

  serialplot is free software: you can redistribute it and/or modify

  it under the terms of the GNU General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  serialplot is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License

  along with serialplot.  If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef PLOTCONTROLPANEL_H

#define PLOTCONTROLPANEL_H

#include <QWidget>

#include <QSettings>

#include "channelinfomodel.h"

namespace Ui {

class PlotControlPanel;

}

class PlotControlPanel : public QWidget

{

    Q_OBJECT

public:

    explicit PlotControlPanel(QWidget *parent = 0);

    ~PlotControlPanel();

    unsigned numOfSamples();

    bool autoScale();

    double yMax();

    double yMin();

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

private:

    Ui::PlotControlPanel *ui;

    /// Holds 'number of samples' after the confirmation

    unsigned _numOfSamples;

    /// User can disable this setting in the checkbox

    bool warnNumOfSamples;

    /// Show a confirmation dialog before setting #samples to a big value

    bool askNSConfirmation(int value);

private slots:

    void onNumOfSamples(int value);

    void onAutoScaleChecked(bool checked);

    void onYScaleChanged();

    void onRangeSelected();

};

#endif // PLOTCONTROLPANEL_H

     </property>

     <item>

      <widget class="QTableView" name="tvChannelInfo">

       <property name="sizePolicy">

        <sizepolicy hsizetype="MinimumExpanding" vsizetype="Expanding">

         <horstretch>0</horstretch>

         <verstretch>0</verstretch>

        </sizepolicy>

       </property>

       <property name="maximumSize">

        <size>

         <width>300</width>

         <height>170</height>

        </size>

       </property>

       <property name="selectionMode">

        <enum>QAbstractItemView::SingleSelection</enum>

       </property>

       <property name="selectionBehavior">

        <enum>QAbstractItemView::SelectRows</enum>

       </property>

      </widget>

     </item>

     <item>

     </item>

    </layout>

   </item>

   <item>

    <widget class="Line" name="line">

     <property name="orientation">

      <enum>Qt::Vertical</enum>

     </property>

    </widget>

   </item>

   <item>

    <layout class="QFormLayout" name="formLayout_2">

     <property name="fieldGrowthPolicy">

      <enum>QFormLayout::FieldsStayAtSizeHint</enum>

     </property>

     <item row="0" column="0">

      <widget class="QLabel" name="label_3">

       <property name="text">

        <string>Number Of Samples:</string>

       </property>

      </widget>

     </item>

     <item row="0" column="1">

      <widget class="QSpinBox" name="spNumOfSamples">