本文整理自网络，侵删。
procedure ScrollBox1MouseWheelUp(Sender: TObject; Shift: TShiftState;
MousePos: TPoint; var Handled: Boolean);
procedure ScrollBox1MouseWheelDown(Sender: TObject; Shift: TShiftState;
MousePos: TPoint; var Handled: Boolean);
private
procedure getmouse(var msg:TWMMouseWheel);message WM_MouseWheel;
{ Private declarations }
procedure TForm1.ScrollBox1MouseWheelUp(Sender: TObject;
Shift: TShiftState; MousePos: TPoint; var Handled: Boolean);
var
posi:integer;
begin
posi := ScrollBox1.vertScrollBar.Position - 25 ;
if ScrollBox1.vertScrollBar.Position < 0 then posi := 0;
ScrollBox1.vertScrollBar.Position := posi;
end;
procedure TForm1.ScrollBox1MouseWheelDown(Sender: TObject;
Shift: TShiftState; MousePos: TPoint; var Handled: Boolean);
begin
ScrollBox1.vertScrollBar.Position := ScrollBox1.vertScrollBar.Position + 25 ;
end;
procedure TForm1.getmouse(var msg:TWMMouseWheel);
begin
ScrollBox1.SetFocus ;
end;
网友补充：
只要scrollBox能获取焦点就可以。
在scrollBox的onMouseMove上设置焦点。
然后在scrollBox的onMouseWhell中：
scrollBox1.Scrollby(0,WheelDelta);
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