tab_widget.h

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#ifndef TAB_BAR_H
#define TAB_BAR_H

#include <QTabBar>
#include <QLabel>
#include <QPixmap>
#include <QDebug>
#include <QTabWidget>
#include <QMimeData>
#include <QDragEnterEvent>
#include <QDragLeaveEvent>
#include <QApplication>

class TabWidget : public QTabWidget
{
    Q_OBJECT
public:
    TabWidget(QWidget* parent)
        : QTabWidget(parent)
    {
        this->tabBar()->setFixedHeight(40);
        setAcceptDrops(true);
    }

    void dragEnterEvent(QDragEnterEvent *ev) override
    {
        if( ev->pos().y() > 43 )
        {
            ev->ignore();
            return;
        }
        const QMimeData *mimeData = ev->mimeData();
        QStringList mimeFormats = mimeData->formats();
        for(const QString& format: mimeFormats)
        {
            QByteArray encoded = mimeData->data( format );
            QDataStream stream(&encoded, QIODevice::ReadOnly);

            QStringList curves;

            while (!stream.atEnd())
            {
                QString curve_name;
                stream >> curve_name;
                if(!curve_name.isEmpty()) {
                    curves.push_back(curve_name);
                }
            }

            if( format.contains( "plot_area") && curves.size() == 1  )
            {
                QApplication::setOverrideCursor(QCursor(Qt::DragMoveCursor));
                ev->accept();
                _plot_to_move = curves.front();
                return;
            }
        }
        ev->ignore();
    }

    void dragMoveEvent(QDragMoveEvent *ev) override
    {
        if( ev->pos().y() > 43 )
        {
            ev->ignore();
            return;
        }
        ev->accept();
    }

    void dragLeaveEvent(QDragLeaveEvent *ev) override
    {
        _plot_to_move = "";
        QApplication::restoreOverrideCursor();
    }

    void dropEvent(QDropEvent *ev) override
    {
        emit movingPlotWidgetToTab(_plot_to_move);
        _plot_to_move = "";
        QApplication::restoreOverrideCursor();
    }

private:
    QString _plot_to_move;

signals:

    void movingPlotWidgetToTab(QString plot_name);
};

#endif // TAB_BAR_H