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  ±è¿µ´ë(2003-03-07 20:13:58, Hit : 4134, Vote : 1350
 MemoÀÇ ÀÔ·Â Çà¼ö/¿­¼ö Á¦ÇÑÇϱâ

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    procedure Memo1KeyPress(Sender: TObject; var Key: Char);
    procedure Memo1KeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

const
  MAX_ROW = 5;  // ÃÖ´ëÇà¼ö
  MAX_COL = 25; // ÃÖ´ëÄ÷³¼ö

var
  Form1: TForm1;

implementation
{$R *.DFM}

// TMemoÀÇ WordWrap ÇÁ·ÎÆÛƼ´Â False ·Î ¼³Á¤

procedure TForm1.Memo1KeyPress(Sender: TObject; var Key: Char);
var
  line, col: Integer;
begin
  with Sender as TMemo do
  begin
    line := Perform(EM_LINEFROMCHAR, SelStart, 0);
    col  := SelStart - Perform(EM_LINEINDEX, line, 0);
    if key = #8 then
    begin
      { Do not allow backspace if caret is on first column and
        deleting the linebreak of the line in front would result
        in a line of more than MAX_COL characters. Damn inconvenient
        for the user but specs are specs... }
      if (col = 0) and (line > 0) then
      begin
        if (Length(lines[line])+Length(lines[line-1])) > MAX_COL then
          Key := #0;
      end; { If }
    end { If }
    else if key in [#13,#10] then
    begin
      { Handle hard linebreaks via Enter or Ctrl-Enter }
      if lines.count >= MAX_ROW then
      begin
        { Max number of lines reached or exceeded, set caret
          to start of next line or this line, if on the last. }
        key := #0;
        if line = (MAX_ROW-1) then
          SelStart := Perform(EM_LINEINDEX, line,0)
        else
          SelStart := Perform(EM_LINEINDEX, line+1,0);
      end; { If }
    end { If }
    else if Key >= ' ' then
    begin
      { Do swallow key if current line has reached limit. }
      if Length( lines[line] ) >= MAX_COL then
        Key := #0;
    end; { If }
  end; { With }
  if Key = #0 then
    Beep;
end;

procedure TForm1.Memo1KeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
var
  line, col: Integer;
begin
  if Key = VK_DELETE then
    with Sender as TMemo do
    begin
      line := Perform(EM_LINEFROMCHAR, SelStart, 0);
      col  := SelStart - Perform(EM_LINEINDEX, line, 0);
      if col = Length(lines[line]) then
        if (line < (MAX_ROW-1)) and ((Length(lines[line]) + Length(lines[line+1])) > MAX_COL) then
        begin
          key := 0;
          Beep
        end;
    end;
end;

end.





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