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typedef void __fastcall (__closure *TMouseWheelEvent)(System::TObject* Sender, System::Classes::TShiftState Shift, int WheelDelta, bool &Handled);


Type Visibility Source Unit Parent
typedef public FMX.Types.hpp FMX.Types FMX.Types


Procedural type that is used for all OnMouseWheel event types.

A TMouseWheelEvent event handler must be called with the following parameters:

  • Sender--a pointer to the object that called this function.
  • Shift--indicates which shift keys--SHIFT, CTRL, ALT, and CMD (only for Mac)--were down when the user pressed the mouse button.
  • WheelDelta--indicates the distance the wheel was rotated.
  • Handled--indicates whether the scroll bar was already moved.

See Also