关于Qt函数的定义有不太明白的,请高手帮忙解答,谢谢
类定义,继承了QDialog 和 uic工具生成的ui类
class SortDialog : public QDialog, public Ui :: SortDialog{ Q_OBJECT public : SortDialog(QWidget *parent = 0); void setColumnRange(QChar first, QChar last); virtual ~SortDialog() {}};// [color=#FF0000]这里的parent传给父类,我不太明白是起什么作用[/color]SortDialog :: SortDialog(QWidget *parent) : QDialog(parent){ setupUi(this); secondaryGroupBox->hide(); tertiaryGroupBox->hide(); layout()->setSizeConstraint(QLayout :: SetFixedSize); QObject::connect(moreButton, SIGNAL(toggled(bool)), secondaryGroupBox, SLOT(setVisible(bool))); setColumnRange('A', 'Z');}