controlkeystate TacControlKeyStateEvent type
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Unit
acControlKeyState

Declaration
TacControlKeyStateEvent = procedure(Sender: TObject; stOn: Boolean) of object;  

Description
The TacControlKeyStateEvent type is the type for events of acControlKeyState component. This event occurs whenever the state of control key has changed.  
 
stOn parameter detemines the state of handled control key. If stOn is True then key is switched on, otherwise - switched off.