Позиционирование курсора как в предыдущей строке

Материал из DRKB

Позиционирование курсора как в предыдущей строке[править | править код]

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    RichEdit1: TRichEdit;
    procedure RichEdit1KeyPress(Sender: TObject; var Key: Char);
  private
    { Private declarations }
  public
    { Public declarations }
end;

var
  Form1: TForm1;

implementation
{$R *.DFM}

uses
  richedit;

procedure TForm1.RichEdit1KeyPress(Sender: TObject; var Key: Char);
var
  line, col, indent: integer;
  S: string;
begin
  if key = #13 then
  begin
    key := #0;
    with Sender as TRichEdit do
    begin
      { figure out line and column position of caret }
      line := Perform(EM_EXLINEFROMCHAR, 0, SelStart);
      Col := SelStart - Perform(EM_LINEINDEX, line, 0);
      { get part of current line in front of caret }
      S := Copy(Lines[line], 1, col);
      { count blanks and tabs in this string }
      indent := 0;
      while (indent < Length(S)) and (S[indent + 1] in [' ', #9]) do
        Inc(indent);
      { insert a linebreak followed by the substring of blanks and tabs }
      SelText := #13#10 + Copy(S, 1, indent);
    end;
  end;
end;

end.


Source: http://delphiworld.narod.ru/
ID: 01020