QTableWidget verticalHeader->width()迷惑

Adjust QTableWidget to contents & How to set a precise size of QTableWidget to prevent from having scroll bars?

 

I wish to set a precise size which does not leave extra space in the viewport,
and on the other hand, not having scroll bars show up. What is the
precise size?

I wrote an example to demonstrate, Please pay attention to the lines:

this->setVisible(true);
this->setVisible(false);

 

 

 

    autoADCalibrationTableWidget->resizeColumnsToContents();
    auotoADCalibrationTableWidget->resizeRowsToContents();
int newWidth = 0;
    int newHeight =0;
    for (int i = 0; i < autoADCalibrationTableWidget->columnCount(); i++) {
        newWidth+= autoADCalibrationTableWidget->columnWidth(i);
    }
    for (int j = 0; j < autoADCalibrationTableWidget->rowCount(); j++) {
        newHeight+= autoADCalibrationTableWidget->rowHeight(j);
    }

this->setVisible(true);
this->setVisible(false);

    newWidth+=autoADCalibrationTableWidget->verticalHeader()->width() +
2 * autoADCalibrationTableWidget->frameWidth();
    newHeight+=autoADCalibrationTableWidget->horizontalHeader()->height() +
2 * autoADCalibrationTableWidget->frameWidth();

autoADCalibrationTableWidget->setMaximumWidth(newWidth);
autoADCalibrationTableWidget->setMinimumWidth(newWidth);

autoADCalibrationTableWidget->setMaximumHeight(newHeight);
autoADCalibrationTableWidget->setMinimumHeight(newHeight);