Controls.TControl.OnMouseWheel
From RAD Studio VCL Reference
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Delphi Information
From Controls.pas
property OnMouseWheel: TMouseWheelEvent read FOnMouseWheel write FOnMouseWheel;
Unit: Controls
Type: event
Visibility: protected
Member Of: TControl
C++ Information
From Controls.hpp
__property TMouseWheelEvent OnMouseWheel;
Unit: Controls
Type: property
Visibility: protected
Member Of: TControl
Description
Occurs when the mouse wheel is rotated.
Write code in the OnMouseWheel event handler to respond to mouse wheel messages. If there is no OnMouseWheel event handler, or if the mouse wheel message is not handled in the OnMouseWheel event handler, then an OnMouseWheelUp or OnMouseWheelDown event occurs, depending on the direction the mouse wheel was rotated.