Author: Tomas Rutkauskas 

How to create a scrollbox that lets you disable automatic scrolling

Answer:

1   unit MyScrollBox;
2   
3   interface
4   
5   uses
6     SysUtils, Classes, Controls, Forms;
7   
8   type
9     TMyScrollBox = class(TScrollBox)
10    private
11      FEnableScrollInView: Boolean;
12    protected
13      procedure AutoScrollInView(AControl: TControl); override;
14    public
15      constructor Create(AOwner: TComponent); override;
16    published
17      property EnableScrollInView: Boolean read FEnableScrollInView
18        write FEnableScrollInView default True;
19    end;
20  
21  procedure register;
22  
23  implementation
24  
25  procedure register;
26  begin
27    RegisterComponents('Samples', [TMyScrollBox]);
28  end;
29  
30  procedure TMyScrollBox.AutoScrollInView(AControl: TControl);
31  begin
32    if FEnableScrollInView then
33      inherited AutoScrollInView(AControl);
34  end;
35  
36  constructor TMyScrollBox.Create(AOwner: TComponent);
37  begin
38    inherited Create(AOwner);
39    FEnableScrollInView := True;
40  end;
41  
42  end.