RibbonGroup添加QLineEdit：

 QLineEdit* controlEdit = new QLineEdit();
            controlEdit->setToolTip(tr("Edit"));
            controlEdit->setText(tr("Edit"));
            controlEdit->setMinimumWidth(150);
            controlEdit->setMaximumWidth(150);
            QAction* act = groupStandard->addWidget(controlEdit);
            act->setText(tr("Edit"));

效果如下：