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Class: TriggerValue
Object
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+--Model
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+--ValueModel
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+--ValueHolder
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+--TriggerValue
- Package:
- stx:libview2
- Category:
- Interface-Support-Models
- Version:
- rev:
1.13
date: 2021/03/16 12:38:48
- user: stefan
- file: TriggerValue.st directory: libview2
- module: stx stc-classLibrary: libview2
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)
copyrightCOPYRIGHT (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.
accessing
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value: anObject
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redefined to send change notifications on every store,
even if the same value is stored again.
|trigger|
trigger := TriggerValue new.
trigger onChangeEvaluate:[ Transcript showCR:'hello' ].
trigger value:true.
Delay waitForSeconds:1.
trigger value:true
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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
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