The Action parameter in DelphiVCL is used to specify the action associated with the control when carrying out Windows development.
Action is the action object that is associated with the control. Actions allow an application to centralize the response to user commands. When control is associated with an action, the action determines the appropriate properties and events of the control (such as whether the control is enabled or how it responds to an OnClick event).
Here is the working example of the implementation of an Action parameter:
def MainFormClose(self, Sender, Action):
Action.Value = caFree
See the complete code here.