[Interest] QColumnView and QTreeView using same model

[Tony Rietwyk]

On 4/05/2022 11:43 pm, Michael Jackson wrote:
> ...
> Now on to figure out how to display checkboxes next to each item. I've tried:
>
> Qt::ItemFlags ImportDataStructureModel::flags(const QModelIndex& index) const
> {
>    if(!index.isValid())
>    {
>      return {};
>    }
>    return Qt::ItemIsUserCheckable | Qt::ItemIsSelectable | QAbstractItemModel::flags(index);
> }
>
> Which does not seem to show anything. I'll probably have to create a custom delegate.
> --
> Mike Jackson
>
Hi Mike,

If you return flag ItemIsUserCheckable in your model, then you must also 
return a valid variant with Qt::CheckState for data(Qt::CheckStateRole) 
- it won't just assume Qt::Unchecked.

Ditto with the item widgets - besides item->setFlags, you need to call 
item->setCheckState as well.

Tony