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detect Form  scroll

Posted on 2001-08-21
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Last Modified: 2010-04-06
hello ,

when there is some control with large size than his container  Form  we got scroll bars.

My question how can i detect when the user click on some scroll bars ?

10x
Asi
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Comment
Question by:asi
3 Comments
 
LVL 4

Expert Comment

by:YodaMage
ID: 6409747
What Control?

TForm has VertScrollBar and HorzScrollBar. Use TScrollingWinControl as a base class when defining a custom windowed control that supports scrolling.

You may have to define an action list to capture the event you need.

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Accepted Solution

by:
Aleq earned 200 total points
ID: 6409808
Hello.
Here is the solution:
-----

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
  private
    { Private declarations }
    procedure WMVScroll(var Msg: TWMVScroll); message WM_VSCROLL;
    procedure WMHScroll(var Msg: TWMHScroll); message WM_HSCROLL;
  public
    { Public declarations }
  end;

// ----------------------

procedure TForm1.WMHScroll(var Msg: TWMHScroll);
begin
  inherited;
  Windows.Beep(1000, 100);
end;

procedure TForm1.WMVScroll(var Msg: TWMScroll);
begin
  inherited;
  Windows.Beep(1000, 100);
end;

WM_HSCROLL - horizontal scrolling
WM_VSCROLL - vertical scrolling

see Win32API help.

regards
  Aleq
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by:Moondancer
ID: 6844606
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