author | Claus Gittinger <cg@exept.de> |
Fri, 18 Jun 1999 22:36:47 +0200 | |
changeset 1187 | a5978013d0ad |
parent 795 | f79766570dd7 |
child 1236 | bdd6c63288bd |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1992 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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Object subclass:#Model |
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instanceVariableNames:'dependents' |
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classVariableNames:'' |
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poolDictionaries:'' |
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category:'Interface-Support-Models' |
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!Model class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1992 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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Models are things which represent information models, i.e. something |
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which holds the data for user interface components and on which these operate. |
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Basically, instances keep track of which components depend on them and |
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inform the dependents of any changes. |
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The Model class itself is abstract and not too useful, see subclasses, |
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especially, ValueHolder and SelectionInList. |
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Notice: |
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Actually the Model class is not really needed; since the dependency |
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mechanism is inherited by Object, you can take any object as a model. |
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However, instances of Model (and subclasses) keep the dependents locally |
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in an instance variable; thus speeding up access a bit. |
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[Instance variables:] |
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dependents <Collection> those objects which depend on me. |
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To save some storage, a single dependent |
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is kept directly here. |
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Otherwise, if there are multiple dependents, |
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a collection of dependents is held here. |
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[author:] |
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Claus Gittinger |
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[see also:] |
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ValueHolder SelectionInList |
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( introduction to view programming :html: programming/viewintro.html#MVC ) |
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" |
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! ! |
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!Model methodsFor:'copying'! |
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postCopy |
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"release dependents after copying" |
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self dependents:nil |
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! ! |
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!Model methodsFor:'dependents access'! |
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addDependent:anObject |
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"make the argument, anObject be a dependent of the receiver" |
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|wasBlocked| |
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wasBlocked := OperatingSystem blockInterrupts. |
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[ |
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|deps| |
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deps := dependents. |
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"/ |
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"/ store the very first dependent directly in |
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"/ the dependents instVar |
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"/ |
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(deps isNil and:[anObject isCollection not]) ifTrue:[ |
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dependents := anObject |
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] ifFalse:[ |
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"/ |
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"/ store more dependents in the dependents collection |
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"/ |
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deps isCollection ifTrue:[ |
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deps add:anObject |
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] ifFalse:[ |
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deps == anObject ifFalse:[ |
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dependents := (IdentitySet with:dependents with:anObject) |
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] |
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] |
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] |
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] valueNowOrOnUnwindDo:[ |
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wasBlocked ifFalse:[ |
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OperatingSystem unblockInterrupts |
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] |
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] |
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"Modified: 8.1.1997 / 23:40:30 / cg" |
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! |
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dependents |
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"return a Collection of dependents" |
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dependents isNil ifTrue:[^ #()]. |
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dependents isCollection ifTrue:[ |
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^ dependents |
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]. |
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^ IdentitySet with:dependents |
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"Modified: / 26.1.1998 / 11:18:24 / cg" |
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! |
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dependents:aCollection |
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"set the collection of dependents" |
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|dep| |
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aCollection size == 1 ifTrue:[ |
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dep := aCollection first. |
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dep isCollection ifFalse:[ |
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dependents := aCollection first. |
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^ self |
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] |
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]. |
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dependents := aCollection |
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"Modified: 19.4.1996 / 12:23:05 / cg" |
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dependentsDo:aBlock |
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"evaluate aBlock for all of my dependents" |
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|deps| |
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deps := dependents. |
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deps notNil ifTrue:[ |
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deps isCollection ifTrue:[ |
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deps do:aBlock |
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] ifFalse:[ |
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aBlock value:deps |
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] |
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] |
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! |
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release |
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"remove all dependencies from the receiver" |
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dependents := nil |
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"Modified: 19.4.1996 / 10:31:35 / cg" |
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! |
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removeDependent:anObject |
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"make the argument, anObject be independent of the receiver" |
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|wasBlocked| |
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"/ must do this save from interrupts, since the dependents collection |
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"/ is possibly accessed from multiple threads. |
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"/ Used to use #valueUninterruptably here; inlined that code for slightly |
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"/ faster execution. |
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|
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wasBlocked := OperatingSystem blockInterrupts. |
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[ |
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|deps sz dep| |
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deps := dependents. |
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deps notNil ifTrue:[ |
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deps isCollection ifTrue:[ |
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deps remove:anObject ifAbsent:[]. |
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(sz := deps size) == 0 ifTrue:[ |
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dependents := nil |
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] ifFalse:[ |
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sz == 1 ifTrue:[ |
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(dep := deps first) isCollection ifFalse:[ |
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dependents := dep |
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] |
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] |
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] |
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] ifFalse:[ |
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deps == anObject ifTrue:[ |
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dependents := nil |
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] |
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] |
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] |
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] valueNowOrOnUnwindDo:[ |
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wasBlocked ifFalse:[ |
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OperatingSystem unblockInterrupts |
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] |
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] |
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"Modified: 8.1.1997 / 23:41:39 / cg" |
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! ! |
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|
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!Model methodsFor:'dependents access (non weak)'! |
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|
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addNonWeakDependent:anObject |
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"make the argument, anObject be a dependent of the receiver. |
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Since all dependencies are nonWeak in Model, this is simply |
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forwarded to addDependent:" |
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|
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^ self addDependent:anObject |
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|
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"Created: 19.4.1996 / 10:28:53 / cg" |
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! |
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|
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Rename misspelled "interrest" to "interest".
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interests |
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"return a Collection of interests - empty if there is none. |
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Here, we use the normal dependents collection for interests." |
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|
189 | 225 |
^ self dependents |
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|
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"Created: / 19.4.1996 / 12:28:23 / cg" |
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"Modified: / 14.10.1996 / 22:19:58 / stefan" |
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"Modified: / 30.1.1998 / 14:07:43 / cg" |
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! |
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|
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nonWeakDependents |
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"return a Collection of dependents - empty if there is none. |
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Since all dependencies are nonWeak in Model, this is a dummy." |
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|
190 | 236 |
^ self dependents |
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|
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"Created: / 19.4.1996 / 10:29:43 / cg" |
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"Modified: / 30.1.1998 / 14:06:17 / cg" |
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! |
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241 |
|
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removeNonWeakDependent:anObject |
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"make the argument, anObject be independent of the receiver. |
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Since all dependencies are nonWeak in Model, this is simply |
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forwarded to removeDependent:" |
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246 |
|
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^ self removeDependent:anObject |
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248 |
|
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"Created: 19.4.1996 / 12:19:40 / cg" |
0 | 250 |
! ! |
251 |
||
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!Model class methodsFor:'documentation'! |
129 | 253 |
|
254 |
version |
|
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^ '$Header: /cvs/stx/stx/libview2/Model.st,v 1.30 1998-01-30 13:23:25 cg Exp $' |
129 | 256 |
! ! |