TransposeProxy-based filtering problem

[mclark]

I have been able to remove the unwanted header values from the rows (0-15) in the tree view. Unforunately those rows remain empty instead of being filled with the filtered values.

I have also found that the data() function can get both the header values AND data values.

QVariant PropInspectProxyModel::data( const QModelIndex& index, int role ) const
{
    QModelIndex source_index = mapToSource( index );
    if ( index.isValid() && !source_index.isValid() )
        return QVariant();
 
    ///////////////////////////////////////////////////////////////////////////
    // How do I know when to get the header data vs. getting the data values???
 
    // Get the Property header string
    QVariant vHdr = sourceModel()->headerData( index.row(), Qt::Horizontal, role );
 
    // Get the data values
    QVariant v = sourceModel()->data( source_index, role );
 
    return v;
}

QVariant PropInspectProxyModel::data( const QModelIndex& index, int role ) const
{
    QModelIndex source_index = mapToSource( index );
    if ( index.isValid() && !source_index.isValid() )
        return QVariant();

    ///////////////////////////////////////////////////////////////////////////
    // How do I know when to get the header data vs. getting the data values???

    // Get the Property header string
    QVariant vHdr = sourceModel()->headerData( index.row(), Qt::Horizontal, role );

    // Get the data values
    QVariant v = sourceModel()->data( source_index, role );

    return v;
}

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Two unresolved issues remain:

1. How can I get my headers to fill rows 0-9 instead of 16-25?
2. How do I know when to get header values or data values in the data() override function?

Examples

1. HeadersHeadersOnly..JPG
2. DataDataOnly..JPG

[ChrisW67]

What does rowCount() on the proxy model return? It should be the number of rows for the given parent index left after the filter is applied. Similarly for the columnCount(). If this is not the case then look at your filter implementations. Is there a hierarchy in the model... are all parent model indexes invalid or not?

When a request is made on the filtered side of the model via data() you need to map the row number to the base model row e.g. proxy row 0 maps to row 16 in the source, 1 to 17, etc. mapToSource() should do this and mapFromSource() should do the inverse. I would have thought the default proxy implementation does this for you and you should not need to reimplement these.

The view should never call data() to retrieve headers, that's what headerData() is for. The proxy default implementation should also be returning the header data from the base model for rows/columns that get past the filter.