[Interest] [External] Proxied view not updating live when source model does

[Elvis Stansvik]

Den tis 21 sep. 2021 16:00Murphy, Sean <Sean.Murphy at centauricorp.com> skrev:

> > I'm having an issue where my proxy model and its associated view aren't
> > updating live when changes are made in the source model.
> >
> > My proxy model simply is attempting to invert the rows of the source
> model. So
> > it inherits from a QSortFilterProxyModel and implements mapFromSource()
> and
> > mapToSource() as follows:
> >
> >     QModelIndex invertRowsModel::mapFromSource(const QModelIndex
> > &sourceIndex) const
> >     {
> >         if(sourceIndex.isValid() && rowCount() > 0)
> >         {
> >             return this->index(rowCount() - sourceIndex.row() - 1,
> > sourceIndex.column());
> >         }
> >
> >         return QModelIndex();
> >     }
> >
>
> Small update here, but I'm not sure what it actually means... I added a
> debug
> statement at the top of my mapFromSource() function, so now that function
> reads like so:
>
>     QModelIndex invertRowsModel::mapFromSource(const QModelIndex
> &sourceIndex) const
>     {
>         if(sourceIndex.isValid() && rowCount() > 0)
>         {
>             qDebug() << __FUNCTION__ << "valid index" << sourceIndex;
>             return this->index(rowCount() - sourceIndex.row() - 1,
> sourceIndex.column());
>         } else {
>             qDebug() << __FUNCTION__ << "invalid index" << sourceIndex;
>         }
>
>         return QModelIndex();
>     }
>
> With this in place, while modifying the data in the source view, I NEVER
> see the
> mapFromSource() "valid index" debug message from the proxy model. Right
> after
> setData() is called in the source model, I see a couple of these messages
> come out
> and that's it:
>
>   invertRowsModel::mapFromSource invalid index
> QModelIndex(-1,-1,0x0,QObject(0x0))
>
> I'm not sure exactly what that means or how to address it, but it is a new
> data point...
>

I added the same kind of printout and concluded the same yesterday, when I
thought I'd help you debug as a challenge.. (then ran out of time).

Curious to see how this progresses..

Code in QSFPM for handling source model dataChanged is a bit hard to
follow..

Elvis


> Sean
>
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