Author: Tomas Rutkauskas

How to reposition the cursor in a TEdit

Answer:

The example below uses two TEdit's:

1   unit Cursor;
2   
3   interface
4   
5   uses
6     SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
7     Forms, Dialogs, StdCtrls;
8   
9   type
10    TForm1 = class(TForm)
11      Edit1: TEdit;
12      Edit2: TEdit;
13      procedure Edit1Change(Sender: TObject);
14      procedure Edit1KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
15    private
16      { Private declarations }
17    public
18      { Public declarations }
19      CurPos: integer;
20    end;
21  
22  var
23    Form1: TForm1;
24  
25  implementation
26  
27  {$R *.DFM}
28  
29  procedure TForm1.Edit1Change(Sender: TObject);
30  begin
31    CurPos := Edit1.SelStart;
32    edit2.Text := IntToStr(CurPos);
33  end;
34  
35  procedure TForm1.Edit1KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
36  begin
37    if Key = VK_LEFT then
38      dec(CurPos);
39    if Key = VK_RIGHT then
40      inc(CurPos); {Right Arrow}
41    edit2.text := inttostr(CurPos);
42  end;
43  
44  end.