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I have a CTreeGridWnd that is two nodes deep. I would like to sort alphabetically on the root’s child nodes. These child nodes contain

CExtGridCellStringDM

 cells. It would be nice to click on the column’s header cell to toggle between ascending and descending. The FilterGrid example shows this in the CGridWnd grid, but not on the CTreeGridWnd grid. Is this possible?

Dear Support,

I have implemented my CTreeGridWnd sorting as suggested. It is working fine, with one exception. The character sort is case sensitive. For example, if there are three strings to sort: alpo; Zippo1; and zippo2. I would like the order to be: alpo; Zippo1; and zippo2. As it is implemented now, the sorted order is: Zippo1; alpo; and zippo2. How do I make the sorting case insensitive?

Thanks,

Gil

By default the cell text comparisons performed by the CExtGridCell::Compare() virtual method implementations in any of grid cell classes are case sensitive. You need to override this method in your grid cell class and perform case sensitive text comparison.

int CYourGridCellClass::Compare(
            const CExtGridCell & other,
            DWORD dwStyleMask, // = __EGCS_COMPARE_MASK
            DWORD dwStyleExMask // = __EGCS_EX_COMPARE_MASK
            ) const
{
            ASSERT_VALID( this );
CExtSafeString sLeft, sRight;
            TextGet( sLeft );
            pCell->TextGet( sRight );
INT nRet = sLeft.CompareNoCase( sRight );
            if( nRet < 0 )
                        return -1;
            if( nRet > 0 )
                        return +1;
            return C_BASE_OF_YourGridCellClass::Compare( other, dwStyleMask, dwStyleExMask );
}

The CExtTreeGridWnd::ItemSortChildren() method sorts children of a specified item. You can sort one level or deeply nested tree levels and this is controlled by the method’s parameters. The plain CExtGridWnd grid control supports sorting on header clicks because there are no questions at all about how to sort plain grid data. The CExtTreeGridWnd tree grid control does not support this feature because it depends on particular task needs. You can override the CExtGridWnd::OnGbwAnalyzeCellMouseClickEvent() virtual method to catch any mouse clicks in any grid, invoke the sorting algorithm and apply sort arrow displaying style to the header cells.