How to make QAbstractItemModel 's data checkable

[nifei]

Hi,
I want to make some data of QAbstractItemModel to be user-checkable. It seems that could be done via QAbstractItemModel : : flags(index), however, how to change the model's flags?

the QStandardItemModel has the interface setCheckable(bool) to make an item checkable or not, but the QAbstractItemModel does not.

By now, i can get the flags by

bool b = index.flags() & Qt::ItemIsUserCheckabel;

bool b = index.flags() & Qt::ItemIsUserCheckabel;

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but how to set it?