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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