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OnMouseWheel

event

Delphi
property OnMouseWheel: TOnMouseWheel read FOnMouseWheel write FOnMouseWheel;
C++Builder
__property TOnMouseWheel OnMouseWheel = {read=FOnMouseWheel, write=FOnMouseWheel};
typedef void __fastcall (__closure *TOnMouseWheel)(System::TObject* Sender, System::LongInt VideoWindow, bool DirectionUp, System::LongInt X, System::LongInt Y);
C++/Qt
void SetOnMouseWheel (TOnMouseWheelCb OnMouseWheelCb);
typedef void CALLBACK TOnMouseWheelCb (void *Object, void *Sender, int VideoWindow, BOOL DirectionUp, int X, int Y);

Occurs when the user turns the mouse wheel up or down and the pointer is over the video window.

To activate this event enable the MouseWheelEventEnabled property (disabled by default)