void MDIProgram::slotChangeWindowTitle(const QString& str)
{
    qobject_cast<DocWindow*>(sender())->setWindowTitle(str);
}

void QDialDistParam::setupDialog(QWidget* dialog)
{
for(int i = tab_mas[tab_index].index + 1; i<dist_vec -> size(); ++i)
        {
            string type = (*dist_vec)[i].getType().toStdString();
            if(type != "Tab")
            {
                string param_name_str = (*dist_vec)[i].getPrName().toStdString();
                QString param_name = (*dist_vec)[i].getPrName();
                if(type == "CheckBox")
                {
                    //
                }
                else if(type == "PushButton")
                {
                    param_name.insert(0, btn_inset);
                    params[param_index].btnColor = new QPushButton(dist_tabs[k]);
                    params[param_index].btnColor -> setObjectName(param_name);
                    params[param_index].btnColor -> setGeometry(btn_x, y, btn_width, btn_height);

                    QString style_sheet = "* { background-color: ";
                    style_sheet += (*dist_vec)[i].getColor();
                    style_sheet += " }";
                    params[param_index].btnColor -> setStyleSheet(style_sheet);
                    connect(params[param_index].btnColor, SIGNAL(pressed()),
                                this, SLOT(btnColorClick())); //// жирным выделен важный кусок кода, на который и следует обратить внимание
                    ++param_index;
                    param_count = param_index;
                    y += 30;
                }
            }
            else break;
        }
        distGraphics -> addTab(dist_tabs[k], QString());
}

 
void QDialDistParam::btnColorClick()
{
    QColor color = QColorDialog::getColor();
    QString color_name = color.name();
    for(int k=0; k<param_count; ++k)
        if(btnSave -> isChecked()) /// ????????????????
        {
            QString style_sheet = "* { background-color: ";
            style_sheet += color_name;
            style_sheet += " }";
            params[k].btnColor ->setStyleSheet(style_sheet);
            break;
        }
}