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"
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COPYRIGHT (c) 1995 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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"{ Package: 'stx:libview2' }"
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ValueHolder subclass:#TriggerValue
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Interface-Support-Models'
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!
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!TriggerValue class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1995 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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documentation
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"
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a triggerValue sends updates on every store of a value, even if the same
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value is stored again.
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It can be used as a triggerChannel of a bufferedValueHolder.
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(however, in this specific use, you can also use normal ValueHolder,
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and set it value to nil before setting it to the actual trigger value)
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[author:]
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Claus Gittinger
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125
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"
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80
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!
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examples
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"
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[exBegin]
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|trigger|
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trigger := TriggerValue new.
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trigger onChangeEvaluate:[ Transcript showCR:'hello' ].
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trigger value:true.
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Delay waitForSeconds:1.
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trigger value:true
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[exEnd]
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buffered editing with a TriggerValue
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[exBegin]
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|firstName lastName trigger dialog|
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firstName := 'foo' asValue.
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lastName := 'bar' asValue.
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trigger := TriggerValue new.
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dialog := Dialog new.
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(dialog addTextLabel:'Name:') layout:#left.
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(dialog addInputFieldOn:(BufferedValueHolder
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subject:firstName
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triggerChannel:trigger)) immediateAccept:true.
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dialog addVerticalSpace.
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(dialog addTextLabel:'Address:') layout:#left.
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(dialog addInputFieldOn:(BufferedValueHolder
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subject:lastName
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triggerChannel:trigger)) immediateAccept:true.
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dialog addAbortButton;
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addButton:(Button new
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label:'undo';
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action:[trigger value:false]);
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addOkButton.
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dialog okAction:[trigger value:true].
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dialog open.
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Transcript show:firstName value; show:' '; showCR:lastName value
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[exEnd]
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"
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! !
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!TriggerValue methodsFor:'accessing'!
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value:anObject
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"redefined to send change notifications on every store,
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even if the same value is stored again."
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self setValue:anObject.
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self changed:#value
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1008
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"Modified: / 28.7.1998 / 11:22:32 / cg"
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! !
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!TriggerValue class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/TriggerValue.st,v 1.11 2014-11-14 11:40:20 cg Exp $'
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! !
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