MultiSelectionInList.st
author Claus Gittinger <cg@exept.de>
Tue, 16 Apr 1996 20:48:22 +0200
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dont err when selection is set, but there is no list
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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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SelectionInList subclass:#MultiSelectionInList
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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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!MultiSelectionInList 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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    Like a selectionInList, but allows for multiple selected items.
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    For use as a model for SelectionInListViews, with multipleSelectOk set to true.
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"
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! !
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!MultiSelectionInList methodsFor:'accessing-values'!
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selection
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    "return the selections value (i.e. the entry numbers in the list)"
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    |l|
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    l := self list.
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    l isNil ifTrue:[^ 0].    "/ mhmh - no list; what should we do here ?
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    ^ selectionIndexHolder value 
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        collect:[:index |
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            l at:index
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        ]
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    "Created: 26.10.1995 / 16:52:27 / cg"
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    "Modified: 16.4.1996 / 15:52:57 / cg"
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!
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selection:anObjectList 
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    "set the selection to be anObjectList."
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    |l indizes|
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    l := self list.
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    l isNil ifTrue:[^ self].   "/ mhmh - no list; what should we do here ?
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    indizes := OrderedCollection new.
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    anObjectList do:[:o |
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        |idx|
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        idx := l indexOf:o ifAbsent:0.
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        idx ~~ 0 ifTrue:[
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            indizes add:idx
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        ].
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    ].
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    ^ self selectionIndex:indizes
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    "Created: 26.10.1995 / 16:40:24 / cg"
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    "Modified: 16.4.1996 / 15:53:03 / cg"
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! !
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!MultiSelectionInList 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:(Array new asValue).
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    "Created: 26.10.1995 / 16:30:22 / cg"
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! !
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!MultiSelectionInList methodsFor:'private'!
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clearSelection
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    selectionIndexHolder setValue:(Array new).
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! !
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!MultiSelectionInList methodsFor:'selections'!
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selections
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    |selectionIndices|
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    selectionIndices := selectionIndexHolder value.
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    (selectionIndices isNil
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     or:[selectionIndices == 0
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     or:[selectionIndices isEmpty]]) ifFalse:[
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        ^ selectionIndices collect:[:index | listHolder value at:index]
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    ].
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    ^ Array new
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    "Modified: 16.4.1996 / 12:15:34 / cg"
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! !
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!MultiSelectionInList class methodsFor:'documentation'!
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version
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    ^ '$Header: /cvs/stx/stx/libwidg/MultiSelectionInList.st,v 1.9 1996-04-16 18:48:22 cg Exp $'
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! !