"

 COPYRIGHT (c) 1995 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

ValueHolder subclass:#TriggerValue

	 instanceVariableNames:''

	 classVariableNames:''

	 poolDictionaries:''

	 category:'Interface-Support-Models'

!

!TriggerValue class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1995 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    a triggerValue sends updates on every store of a value, even if the same

    value is stored again.

    It can be used as a triggerChannel of a bufferedValueHolder.

    (however, in this specific use, you can also use normal ValueHolder,

     and set it value to nil before setting it to the actual trigger value)

"

!

examples 

"

    buffered editing with a TriggerValue

	|firstName lastName trigger dialog|

	firstName :=  'foo' asValue.

	lastName := 'bar' asValue.

	trigger := TriggerValue new.

	dialog := Dialog new.

	(dialog addTextLabel:'Name:') layout:#left.

	(dialog addInputFieldOn:(BufferedValueHolder

				    subject:firstName

				    triggerChannel:trigger)) immediateAccept:true.

	dialog addVerticalSpace.

	(dialog addTextLabel:'Address:') layout:#left.

	(dialog addInputFieldOn:(BufferedValueHolder

				    subject:lastName

				    triggerChannel:trigger)) immediateAccept:true.

	dialog addAbortButton; 

	       addButton:(Button new 

				label:'undo'; 

				action:[trigger value:false]);

	       addOkButton.

	dialog okAction:[trigger value:true].

	dialog open.

	Transcript show:firstName value; show:' '; showCr:lastName value

"

! !

!TriggerValue methodsFor:'accessing'!

value:anObject

    "redefined to send change notifications on every store"

    self setValue:anObject.

    "/ self notifyChange:#value

    self changed:#value

! !

!TriggerValue class methodsFor:'documentation'!

version

    ^ '$Header: /cvs/stx/stx/libview2/Attic/TriggerVal.st,v 1.6 1995-11-23 17:48:25 cg Exp $'

! !