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Delphi 1

TMemo с row & col

Наследник TMemo со свойствами row & col:


    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.
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