Qt: 自动调整到最合适的大小

Qt: 自动调整到最合适的大小

SortDialog::SortDialog(QWidget  * parent) :
    QDialog(parent) {
    setupUi( this );

    groupBox_2 -> hide();
    groupBox_3 -> hide();

    layout() -> setSizeConstraint(QLayout::SetFixedSize);

    setColumnRange( ' A ' ,  ' Z ' );
}

SortDialog:: ~ SortDialog() {
}

void  SortDialog::setColumnRange(QChar first, QChar last) {
    primaryColumnComboBox -> clear();
    secondaryColumnComboBox -> clear();
    tertiaryColumnComboBox -> clear();
    secondaryColumnComboBox -> addItem(tr( " None " ));
    tertiaryColumnComboBox -> addItem(tr( " None " ));
    primaryColumnComboBox -> setMinimumSize(secondaryColumnComboBox -> sizeHint());

    QChar ch  =  first;
     while  (ch  <=  last) {
        primaryColumnComboBox -> addItem(QString(ch));
        secondaryColumnComboBox -> addItem(QString(ch));
        tertiaryColumnComboBox -> addItem(QString(ch));

        ch  =  ch.unicode()  +   1 ;
    }
}