How to find the actual width of grid component with scrollbar in Delphi

Question

I have a grid component (DBGrid) which has lots of columns on it. Because of large number of columns, a scrollbar was created, and thus some part of grid remains hidden. I n

Answer 1

Here are functions we have used in the past. It takes into account the width of data based on the font and also compensates for vertical lines if they are visible

function GridTextWidth(fntFont : TFont; const sString : OpenString) :
  integer;
var
  f: TForm;
begin
  try
    f:=TForm.Create(nil);
    f.Font:=fntFont;
    result:=f.canvas.textwidth(sstring);
  finally
    f.Free;
    end;
end;




function CalcGridWidth(dbg : TDBGrid { the grid to meaure }): integer; { the "exact" width }
const cMEASURE_CHAR   = '0';
      iEXTRA_COL_PIX  = 4;
      iINDICATOR_WIDE = 11;
var i, iColumns, iColWidth, iTitleWidth, iCharWidth : integer;
begin
  iColumns := 0;
  result   := GetSystemMetrics(SM_CXVSCROLL);

  iCharWidth := GridTextWidth(dbg.font,cMeasure_char);

  with dbg.dataSource.dataSet do begin
    DisableControls;
    for i := 0 to FieldCount - 1 do with Fields[i] do
      if visible then
      begin
        iColWidth := iCharWidth * DisplayWidth;
        if dgTitles in dbg.Options then begin
          ititlewidth:=GridTextWidth(dbg.titlefont,displaylabel);
          if iColWidth < iTitleWidth then
            iColWidth := iTitleWidth;
        end;
        inc(iColumns, 1);
        inc(result, iColWidth + iEXTRA_COL_PIX);
      end;
      EnableControls;
    end;

  if dgIndicator in dbg.Options then
  begin
    inc(iColumns, 1);
    inc(result, iINDICATOR_WIDE);
  end;
  if dgColLines in dbg.Options then
    inc(result, iColumns)
  else
    inc(result, 1);
end;