[Qt-interest] Proxy model with more indexes than its source model

[Alexandre Beraud]

Hi,

data() IS virtual (see QAbstractItemModel: virtual QVariant *data 
<qabstractitemmodel.html#data>* ( const QModelIndex & /index/, 
int /role/ = Qt::DisplayRole ) const = 0). Otherwise there would be no 
point is subclassing QAbstractItemModel.

Regards,

Alex


Jugdish a écrit :
> Is it possible to have a proxy model that has more indexes than its 
> underlying source model?
>
> I'd like to have a proxy model that inserts additional "header" rows 
> which act as separators between blocks of rows from the source model. 
> The proxy model would know which rows indexes correspond to the header 
> rows, and it would offset the source model rows to make room for the 
> additional rows.
>
> The problem I'm facing is that QAbstractProxyModel really only gives 
> access to mapToSource() and mapFromSource(), which assume that there 
> is a source model index corresponding to every proxy model index. But 
> since the header rows only exist in the proxy model, I need to somehow 
> deal with that scenario. My first hunch was to re-implement 
> QAbstractProxyModel::data(), but unfortunately it is not declared as 
> virtual.
>
> Any ideas?
>
> Thanks,
> -Jugdish
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