Forum

Hello,

How can I get or compute the minimal height of the CExtReportGridWnd derived control in order to display all its content without need to use the scrollbars.
The use of RowCountGet() * DefaultRowHeightGet() does not work since rows have different height,

Thanks a lot.

The following code snippet computes the height of a report grid window as the total height of header row(s) at top, data rows, horizontal scroll bar and report grid’s non-client area:

CExtReportGridWnd & wndRG = . . .
LONG nIndex, nCount;
// header rows at top
LONG nTopHeight = 0;
            nCount = wndRG.OuterRowCountTopGet();
            for( nIndex = 0; nIndex < nCount; nIndex ++ )
            {
                        INT nRowHeight = wndRG.OuterRowHeightGet( true, nIndex );
                        nTopHeight +=  nRowHeight;
            }
// data rows (only expanded scrollable rows are computed)
LONG nDataHeight = 0;
            nCount =  wndRG.RowCountGet();
            for( nIndex = 0; nIndex < nCount; nIndex ++ )
            {
                        INT nExtraSpaceBefore = 0, nExtraSpaceAfter = 0;
                        INT nRowHeight = wndRG.OnSiwQueryItemExtentV( nIndex, &nExtraSpaceBefore, &nExtraSpaceAfter );
                        nTopHeight +=  nRowHeight + nExtraSpaceBefore + nExtraSpaceAfter;
            }
// non-client area
CRect rcWnd, rcClient;
            wndRG.GetWindowRect( &rcWnd );
            wndRG.GetClientRect( &rcClient );
LONG nNonClientAreaHeight =  rcWnd.Height() - rcClient.Height();
// horizontal scroll bar if present and if it’s window (not a non-client area part)
LONG nSbhHeight = 0;
            if( wndRG.OnSwHasScrollBar( true ) )
            {
                        CScrollBar * pSBH = wndRG.GetScrollBarCtrl( SB_HORZ );
                        if( pSBH->GetSafeHwnd() != NULL && ( pSBH->GetStyle() & WS_VISIBLE ) != 0 )
                        {
                                    CRect rcSBH;
                                    pSBH->GetWindowRect( &rcSBH );
                                    nSbhHeight =  rcSBH.Height();
                        }
            }
// result
LONG nReportGridHeight =  nTopHeight + nDataHeight +  nNonClientAreaHeight + nSbhHeight;

The above code assumes the report grid’s layout has been updated after initialization. So, if you invoke it at startup immediately after report grid initialization, you should invoke the wndRG.OnSwRecalcLayout( true ); line of code before the code above to update report grid’s layout.