[Soa Pelaez]

Empezado por roman

Pon el código final del procedimiento.

LineComment Saludos

Aqui está.

Código Delphi [-]
procedure ValidarPorcentajeKeyPressEdit(Caracter: Char;Edit:TrDBEdit);
var
  pos: Cardinal;
begin
  i:=0;
  if ( StrScan('0123456789.,'+chr(7)+chr(8)+#13, Caracter) = nil ) then  Caracter := #0;
  // cambia el punto decimal por coma
  if (Caracter = '.') or (Caracter = ',') then Caracter := ',';
  //controlar entrada una sola coma
  for i := 1 to length(Edit.Text) do
    if ( copy((Edit.Text), i , 1) = ',' ) and not ( StrScan(',', Caracter) = nil ) then  Caracter := #0;

  with Edit as TrDBEdit do
  begin
    pos := System.Pos(',', Text);
    if not LongBool(Pos) then Dec(Pos);
      ReadOnly := not (Caracter in ['0'..'9',#13, ',', #8]) or
        (Pos <> $FFFFFFFF) and (Caracter = ',') or
        ((Caracter <> #8) and (Caracter <> #13) and (Pos < (SelStart - 1)));
  end;
end;

//EJECUCIÓN DESDE EL KEYPRESS DEL COMPONENTE TRDBEDIT
procedure TForm.DBPorcentajeKeyPress(Sender: TObject; var Key: Char);
begin
  ValidarPorcentajeKeyPressEdit(Key,Sender AS TrDBEdit);
end;