TTMSFMXGrid Display vs stored precision

FMX TMS FMX UI Pack
1

Is it possible to store floating points at full precision while displaying rounded values in the cells?

2

Yes, 


You can use the Floats property to store floating points with full precision and use the Format function property to apply rounding in the OnGetCellData:

procedure TForm1.FormCreate(Sender: TObject);
begin
  TMSFMXGrid1.Floats[1, 1] := 4.123456;
end;

procedure TForm1.TMSFMXGrid1GetCellData(Sender: TObject; ACol, ARow: Integer;
  var CellString: string);
var
  f: Double;
begin
  if TryStrToFloat(CellString, f) then
    CellString := Format('%.0f', [f]);
end;