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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.
[000554]



Содержание раздела