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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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ValueModel subclass:#BlockValue
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instanceVariableNames:'cachedValue arguments block'
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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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!BlockValue 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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BlockValues depend on multiple other objects (typically valueHolders)
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and recompute a value whenever one of them changes.
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If the new value is different, it triggers itself a change to its dependents.
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Example use is to base an enableChannels value on multiple other boolean values.
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(See example for how this is done)
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"
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!
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examples
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"
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|val1 val2 both box|
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val1 := false asValue.
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val2 := false asValue.
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both := BlockValue
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with:[:v1 :v2 |
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Transcript showCr:'evaluating ...'.
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v1 value and:[v2 value]
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]
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arguments:(Array with:val1 with:val2).
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box := Dialog new.
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box addCheckBox:'one' on:val1.
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box addCheckBox:'two' on:val2.
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box addHorizontalLine.
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box addCheckBox:'both' on:both.
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box open
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"
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! !
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!BlockValue class methodsFor:'instance creation'!
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with:aBlock
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"return a new BlockValue computing aBlock"
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^ (super new) setBlock:aBlock
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"Created: 16.12.1995 / 19:16:33 / cg"
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!
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with:aBlock arguments:aCollectionOfArguments
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"return a new BlockValue computing aBlock"
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^ (super new) setBlock:aBlock arguments:aCollectionOfArguments
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"Created: 16.12.1995 / 19:20:14 / cg"
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! !
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!BlockValue methodsFor:'accessing'!
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dependOn:someObject
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arguments isNil ifTrue:[
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arguments := Array with:someObject
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] ifFalse:[
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arguments := arguments copyWith:someObject
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].
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someObject addDependent:self
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"Modified: 16.12.1995 / 19:18:31 / cg"
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!
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evaluate
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arguments isNil ifTrue:[
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^ block value
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].
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^ block valueWithArguments:(arguments asArray)
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"Created: 16.12.1995 / 19:27:40 / cg"
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!
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setBlock:aBlock
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block := aBlock.
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arguments notNil ifTrue:[
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self release
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].
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arguments := nil.
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"Created: 16.12.1995 / 19:16:59 / cg"
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"Modified: 16.12.1995 / 19:21:22 / cg"
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!
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setBlock:aBlock arguments:aCollectionOfArguments
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block := aBlock.
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arguments notNil ifTrue:[
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self release
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].
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arguments := aCollectionOfArguments.
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arguments do:[:arg |
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arg addDependent:self
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].
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"Created: 16.12.1995 / 19:21:41 / cg"
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"Modified: 16.12.1995 / 19:29:42 / cg"
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!
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value
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^ cachedValue
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"Created: 16.12.1995 / 19:23:26 / cg"
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"Modified: 16.12.1995 / 19:27:50 / cg"
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! !
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!BlockValue methodsFor:'change and update'!
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update:something with:aParameter from:someone
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|oldValue|
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oldValue := cachedValue.
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cachedValue := self evaluate.
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oldValue ~~ cachedValue ifTrue:[
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self changed:something with:aParameter
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].
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"Created: 16.12.1995 / 19:22:54 / cg"
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"Modified: 16.12.1995 / 19:28:00 / cg"
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! !
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!BlockValue methodsFor:'release'!
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release
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arguments notNil ifTrue:[
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arguments do:[:arg | arg removeDependent:self].
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].
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"Modified: 16.12.1995 / 19:21:11 / cg"
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! !
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!BlockValue class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/BlockValue.st,v 1.1 1995-12-16 18:36:39 cg Exp $'
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! !
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