unit C_rcmemo;
interface
uses
 SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
 Forms, Dialogs, StdCtrls;
type
 TRCMemo = class(TMemo)
 private
  { Private declarations }
  function GetRow: Integer;
  procedure SetRow(value: Integer);
  function GetCol: Integer;
  procedure SetCol(value: Integer);
  function GetPosn: LongInt;
  procedure SetPosn(value: LongInt);
 protected
  { Protected declarations }
 public
  { Public declarations }
 published
  { Published declarations }
  property Row: Integer read GetRow write SetRow;
  property Col: Integer read GetCol write SetCol;
  property Posn: LongInt read GetPosn write SetPosn;
 end;
procedure Register;
implementation
function TRCMemo.GetRow: Integer;
begin
 Result := Perform(EM_LINEFROMCHAR, $FFFF, 0);
end;
procedure TRCMemo.SetRow(value: Integer);
begin
 SelStart := GetCol + Perform(EM_LINEINDEX, Value, 0);
end;
function TRCMemo.GetCol: Integer;
begin
 Result := SelStart - Perform(EM_LINEINDEX, GetRow, 0);
end;
procedure TRCMemo.SetCol(value: Integer);
begin
 SelStart := Perform(EM_LINEINDEX, GetRow, 0) + Value;
end;
function TRCMemo.GetPosn: LongInt;
var
 ro, co: Integer;
begin
 ro := GetRow;
 co := SelStart - Perform(EM_LINEINDEX, ro, 0);
 Result := MakeLong(co, ro);
end;
procedure TRCMemo.SetPosn(value: LongInt);
begin
 SelStart := Perform(EM_LINEINDEX, HiWord(Value), 0) + LoWord(Value);
end;
procedure Register;
begin
 RegisterComponents('NJR', [TRCMemo]);
end;
end.