Author: Jonas Bilinkevicius

How to get the current row and column of a cursor in a TRichEdit

Answer:

1   procedure TForm1.GetPosition(Sender: TRichEdit);
2   var
3     aX, aY: Integer;
4     TheRichEdit: TRichEdit;
5   begin
6     aX := 0;
7     aY := 0;
8     TheRichEdit := TRichEdit(Sender);
9     aY := SendMessage(TheRichEdit.Handle, EM_LINEFROMCHAR, TheRichEdit.SelStart, 0);
10    aX := TheRichEdit.SelStart - SendMessage(TheRichEdit.Handle, EM_LINEINDEX, aY, 0);
11    Panel1.Caption := IntToStr(aY + 1) + ':' + IntToStr(aX + 1);
12  end;
13  
14  procedure TForm1.RichEditMouseDown(Sender: TObject; Button: TMouseButton;
15    Shift: TShiftState; X, Y: Integer);
16  begin
17    GetPosition(RichEdit);
18  end;
19  
20  procedure TForm1.RichEditKeyUp(Sender: TObject; var Key: Word; Shift: TShiftState);
21  begin
22    GetPosition(RichEdit);
23  end;