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"
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COPYRIGHT (c) 1994 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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ValueHolder subclass:#SelectionInList
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instanceVariableNames:'listHolder selectionIndexHolder'
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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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!SelectionInList class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1994 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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Instances of SelectionInList can be used as model for
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a SelectionInListView or a PopUpList.
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They keep two values: a list value and a selection value;
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both are referred to via valueHolders.
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If any changes, the selectionInList notifies its dependents via a
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self changed: notification,
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using #list or #selectionIndex as aspect respectively.
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A popupList also knows how to deal with a slectionInList model;
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this makes it possible to have popupLists be somewhat exchangable
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with selectionInListViews.
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"
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!
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examples
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"
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basic setup:
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|m v|
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m := SelectionInList new.
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m list:#('one' 'two' 'three' 'four').
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m selectionIndex:2.
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v := SelectionInListView on:m.
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v open
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two views on the same selectionInList:
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and a button, which adds an item to the list.
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|m v1 v2 b numItems|
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numItems := 4.
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m := SelectionInList new.
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m list:((1 to:numItems) collect:[:i | i printString]).
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m selectionIndex:2.
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v1 := ScrollableView forView:(SelectionInListView on:m).
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v1 open.
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v2 := ScrollableView forView:(SelectionInListView on:m).
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v2 open.
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b := Button label:'add item'.
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b action:[numItems := numItems + 1.
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m list:((1 to:numItems) collect:[:i | i printString]).
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].
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b open
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"
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! !
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!SelectionInList class methodsFor:'instance creation'!
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with:aList
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^ self new listHolder:(ValueHolder with:aList)
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! !
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!SelectionInList methodsFor:'accessing-holders'!
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listHolder
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"return the one holding the list"
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^ listHolder
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!
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listHolder:aValueHolder
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"set the one holding the list.
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Q: should we forward a change-notification ?"
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listHolder notNil ifTrue:[
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listHolder removeDependent:self
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].
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listHolder := aValueHolder.
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listHolder addDependent:self
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!
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selectionHolder
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"return someone holding on the selection itself
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(not the index). Since we have no one, we need an adapter,
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to get up-to-date values."
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^ AspectAdaptor
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subject:self sendsUpdates:true
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accessWith:#selection assignWith:#'selection:' aspect:#selectionIndex
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!
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selectionIndexHolder
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"return the one holding the index"
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^ selectionIndexHolder
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!
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selectionIndexHolder:aValueHolder
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"set the one holding the index.
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Q: should we forward a change-notification ?"
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selectionIndexHolder notNil ifTrue:[
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selectionIndexHolder removeDependent:self
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].
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selectionIndexHolder := aValueHolder.
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selectionIndexHolder addDependent:self
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! !
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!SelectionInList methodsFor:'accessing-values'!
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list
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^ listHolder value
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!
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list:aCollection
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listHolder value:aCollection.
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!
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selection
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"return the selections value (i.e. the entry in the list"
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|idx|
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idx := self selectionIndex.
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(idx isNil or:[idx == 0]) ifTrue:[^ nil].
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^ self list at:idx
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!
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selection:anObject
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"set the selection to be anObject.
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If anObject is not in the list, the selection is cleared"
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^ self selectionIndex:(self list indexOf:anObject ifAbsent:0)
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!
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selectionIndex
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^ selectionIndexHolder value
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!
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selectionIndex:newIndex
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selectionIndexHolder value ~= newIndex ifTrue:[
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selectionIndexHolder value:newIndex
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]
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! !
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!SelectionInList methodsFor:'change & update'!
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update:something with:aParameter from:changedObject
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"whenever one of my holders value changes,
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tell my dependents about this"
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changedObject == selectionIndexHolder ifTrue:[
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"/ self notifyChange:#selectionIndex
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self changed:#selectionIndex
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] ifFalse:[
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changedObject == listHolder ifTrue:[
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something == #value ifTrue:[
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selectionIndexHolder setValue:0.
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"/ self notifyChange:#list.
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"/ selectionIndexHolder notifyChange:#value
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self changed:#list.
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selectionIndexHolder changed:#value
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]
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]
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]
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! !
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!SelectionInList methodsFor:'initialization'!
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initialize
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self listHolder:(nil asValue). "/ could also use an empty collection here
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self selectionIndexHolder:(nil asValue).
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! !
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!SelectionInList methodsFor:'obsolete backward compatibility'!
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index
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"OBSOLETE interface"
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self obsoleteMethodWarning:'use #selectionIndex'.
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^ self selectionIndex
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!
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index:newIndex
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"OBSOLETE interface"
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self obsoleteMethodWarning:'use #selectionIndex:'.
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^ self selectionIndex:newIndex
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!
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indexHolder
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"OBSOLETE interface"
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self obsoleteMethodWarning:'use #selectionIndexHolder'.
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^ self selectionIndexHolder
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!
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indexHolder:aValueHolder
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"OBSOLETE interface"
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self obsoleteMethodWarning:'use #selectionIndexHolder:'.
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^ self selectionIndexHolder:aValueHolder
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! !
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!SelectionInList class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libwidg/SelectionInList.st,v 1.8 1996-02-11 11:53:44 cg Exp $'
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! !
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