成员的完整列表，这些成员属于 QwtPlotSeriesDataPickerGroup,包括所有继承而来的类成员

addPicker(QwtPlotSeriesDataPicker *pick)	QwtPlotSeriesDataPickerGroup
clicked(QwtPlotSeriesDataPicker *picker, const QPoint &pos)	QwtPlotSeriesDataPickerGroup	signal
doubleClicked(QwtPlotSeriesDataPicker *picker, const QPoint &pos)	QwtPlotSeriesDataPickerGroup	signal
isEnabled() const	QwtPlotSeriesDataPickerGroup
onPickerActivated(bool on) (定义于 QwtPlotSeriesDataPickerGroup)	QwtPlotSeriesDataPickerGroup	slot
onPickerClicked(QwtPlotSeriesDataPicker *picker, const QPoint &pos)	QwtPlotSeriesDataPickerGroup	slot
onPickerDestroy(QObject *obj) (定义于 QwtPlotSeriesDataPickerGroup)	QwtPlotSeriesDataPickerGroup	slot
onPickerDoubleClicked(QwtPlotSeriesDataPicker *picker, const QPoint &pos)	QwtPlotSeriesDataPickerGroup	slot
onPickerMove(const QPoint &pos) (定义于 QwtPlotSeriesDataPickerGroup)	QwtPlotSeriesDataPickerGroup	slot
pickers() const	QwtPlotSeriesDataPickerGroup
QwtPlotSeriesDataPickerGroup(QObject *par=nullptr)	QwtPlotSeriesDataPickerGroup
removePicker(QwtPlotSeriesDataPicker *pick)	QwtPlotSeriesDataPickerGroup
setEnabled(bool on)	QwtPlotSeriesDataPickerGroup
~QwtPlotSeriesDataPickerGroup() override	QwtPlotSeriesDataPickerGroup