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4D v14.3

IDLE


	IDLE

	Does not require any parameters

Description

The IDLE command is designed only for use with the compiler. This command is only used in compiled databases in which user-defined methods are written so that no calls are made back to the 4D engine. For example, if a method has a For loop in which no 4D commands are executed, the loop could not be interrupted by a process installed with ON EVENT CALL, nor could a user switch to another application. In this case, you should insert IDLE to allow 4D to trap events. If you do not want any interruptions, omit IDLE.

Example

In the following example, the loop would never terminate in a compiled database without the call to IDLE:

  ` Do Something Project Method

 ON EVENT CALL("EVENT METHOD")

 ◊vbWeStop:=False

 MESSAGE("Processing..."+Char(13)+"Type any key to interrupt...")

 Repeat

  ` Do some processing that doesn’t involve a 4D command

    IDLE

 Until(◊vbWeStop)

 ON EVENT CALL("")

with:

  ` EVENT METHOD Project Method

 If(Undefined(KeyCode))

    KeyCode:=0

 End if

 If(KeyCode#0)

    CONFIRM("Do you really want to stop this operation?")

    If(OK=1)

       ◊vbWeStop:=True

    End if

 End if