Forum

 

I need to map the visible row index to the un-hidden row index, any ideas?

 

Thanks very much.  Interestingly I still get a compiler error with ’- nRowCountReserved

This is probably some compiler’s bug. You can split one line of code into several lines computing the same.

The line:

nDstRowNo = LONG( _DataProvider.MapV2RY( ULONG(nSrcRowNo) - nRowCountReserved ) – nRowCountReserved );

gives the compiler error: C2146: syntax error : missing ’)’ before identifier ’’

I’ve tried changing the brackets but just get negative values returned!

 

We are sorry. We mean:

nDstRowNo = LONG( _DataProvider.MapV2RY( ULONG(nSrcRowNo) + nRowCountReserved ) – nRowCountReserved );

We need to add the number of outer header rows first. Then we convert the data provider’s virtual row index into the real index. Finally we need to subtract the number of outer header rows first to get the plain data row index.

I want to map inner rows only - can you provide some sample code please.

 

Here is the sample code:

LONG nSrcRowNo = . . .
CExtGridWnd * pWndGrid = . . .
CExtGridDataProvider & _DataProvider = pWndGrid->OnGridQueryDataProvider();
LONG nDstRowNo = nSrcRowNo;
if( _DataProvider.MappingIsEnabledY() )
{
        ULONG nColCountReserved, nRowCountReserved;
        _DataProvider.CacheReservedCountsGet( &nColCountReserved, &nRowCountReserved );
         nDstRowNo = LONG( _DataProvider.MapV2RY( ULONG(nSrcRowNo) - nRowCountReserved ) – nRowCountReserved );
}

This information is stored inside the data provider decorated by the CExtMDP template class. The CExtMDP::MapV2RY() does what you need. Please note, the parameter and return value of this method is the plain index in entire row storage which is organized as the following sequence: header rows at top, then header rows at bottom, then data rows.