RAD Studio VCL Reference
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StdCtrls.TScrollEvent Type

TScrollEvent is the type of an OnScroll event handler.

Pascal
TScrollEvent = procedure (Sender: TObject; ScrollCode: TScrollCode; var ScrollPos: Integer) of object;
C++
(Sender: TObject; ScrollCode: TScrollCode; var ScrollPos: Integer) ( TScrollEvent)();

TScrollEvent defines the type of method procedure that you must define in order to implement the OnScroll event of a visual component such as TScrollBar.  

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. 

 

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