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Object subclass:#WeakInterestConverter
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instanceVariableNames:'destinationHolder selector aspect'
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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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!WeakInterestConverter class methodsFor:'documentation'!
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documentation
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"
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these are much like InterestConverters; however, the reference to
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the destination is weak, which allows for them to be garbage collected.
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[author:]
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Claus Gittinger
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"
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! !
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!WeakInterestConverter class methodsFor:'instance creation'!
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destination:anObject selector:aSelector
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"create & return an interestConverter, which sends aSelector
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to anObject when a change notification arrives"
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^ self basicNew destination:anObject selector:aSelector
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"Created: 21.5.1997 / 14:08:49 / cg"
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!
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destination:anObject selector:aSelector aspect:aspect
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"create & return an interestConverter, which sends aSelector
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to anObject when a change notification for aspect arrives"
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^ self basicNew destination:anObject selector:aSelector aspect:aspect
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"Created: 21.5.1997 / 14:08:49 / cg"
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! !
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!WeakInterestConverter methodsFor:'accessing'!
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aspect
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"return my aspect (if any)"
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^ aspect
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"Created: 21.5.1997 / 14:08:49 / cg"
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!
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destination
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"return my destination"
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^ destinationHolder at:1
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"Created: 21.5.1997 / 14:08:49 / cg"
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!
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destination:dest selector:sel
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"set destination and selector"
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destinationHolder := WeakArray with:dest.
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selector := sel
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"Created: 21.5.1997 / 14:08:49 / cg"
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!
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destination:dest selector:sel aspect:a
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"set destination, selector and aspect"
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destinationHolder := WeakArray with:dest.
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selector := sel.
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aspect := a
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"Created: 21.5.1997 / 14:08:49 / cg"
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! !
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!WeakInterestConverter methodsFor:'change & update'!
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update:something with:aParameter from:someObject
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|destination|
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(aspect isNil or:[aspect == something]) ifTrue:[
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destination := destinationHolder at:1.
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destination notNil ifTrue:[
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destination perform:selector
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]
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]
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"Modified: 8.3.1996 / 22:41:53 / cg"
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"Created: 21.5.1997 / 14:08:49 / cg"
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! !
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!WeakInterestConverter class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libbasic/WeakInterestConverter.st,v 1.1 1997-05-21 12:17:57 cg Exp $'
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! !
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