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bool MyModel::removeRows(int row, int count, const QModelIndex &parent)
{// row=1, always
    beginInsertRows(parent, row, row + count - 1);
    vec->delRow(row);
    endInsertRows();
    return true;
}

#ifndef VECTOR2DROLES_H
#define VECTOR2DROLES_H

#include <QVector>
#include <QColor>

class Vector2dRoles
{
public:
    Vector2dRoles();
    Vector2dRoles(int _sizeX, int _sizeY);
    void appendRow(QColor _clr, QString _str);
    void delRow(int numRow);
    QVector< QVector< QString > > str;
    QVector< QVector< QColor > > clr;
private:
    int sizeY;
    QString dftStr;
    QColor dftClr;
};

#endif // VECTOR2DROLES_H

#include "vector2droles.h"
#include <QDebug>

Vector2dRoles::Vector2dRoles(int _sizeX, int _sizeY)
{
    dftStr = "";
    dftClr = QColor(Qt::gray);
    sizeY = _sizeY;
    str = QVector< QVector< QString > >(_sizeX, QVector< QString >(_sizeY, dftStr));
    clr = QVector< QVector< QColor > >(_sizeX, QVector< QColor >(_sizeY, dftClr));
}

void Vector2dRoles::appendRow(QColor _clr, QString _str)
{
    QVector<QString> strVec = QVector<QString>(sizeY, _str);
    QVector<QColor> clrVec = QVector<QColor>(sizeY, _clr);
    str.append(strVec);
    clr.append(clrVec);
}

void Vector2dRoles::delRow(int numRow)
{
    str.remove(numRow);
    clr.remove(numRow);
}