TScrollEvent is the type of an OnScroll event handler.
TDrawItemEvent = procedure (Control: TWinControl; Index: Integer; Rect: TRect; State: TOwnerDrawState) of object;
(Control: TWinControl; Index: Integer; Rect: TRect; State: TOwnerDrawState) ( TDrawItemEvent)();
StdCtrls
TScrollEvent defines the type of method procedure that you must define in order to implement the OnScroll event of a visual component such as TScroll.
The OnScroll event occurs when the user scrolls a scroll bar with the mouse or keyboard.
Sender is a reference to the component invoking the OnScroll event.
ScrollCode defines the user scroll action that was performed.
ScrollPos provides the new scroll position.
OnScroll
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