Command PV Get on event method

PV Get on event method

version 6.8

PV Get on event method (area; event) String

Parameter	Type		Description
area	Longint		4D View area
event	Longint		4D View event

Function result String 4D method name

The PV Get on event method command returns the name of the method linked with the specified event callback.

The PV Event constants are used to define the events.

If no method has been linked to an event, PV Get on event method returns an empty string.

It is wise to temporarily disable an on event call and execute a process before re-establishing the original call.

Here is a simple method that generates this "disengagement" in a generic manner using PV Get on event method, for example, for the pv on cell value changed event:

   C_STRING(32;$EventMethod)

      `Save the method that may be in place
     $EventMethod:=PV Get on event method (Area;pv on cell value changed) 

   PV ON EVENT (Area;pv on cell value changed ;"")  `Cancellation

      `... Put the process to execute here

   PV ON EVENT (Area;pv on cell value changed;$EventMethod)  `Restore

PV Get on command method, PV Get on error method, PV ON EVENT.

PV Event theme.