author | Claus Gittinger <cg@exept.de> |
Tue, 23 Apr 1996 12:40:18 +0200 | |
changeset 203 | a38debd57097 |
parent 190 | f8de925054bf |
child 223 | b65dc250db8d |
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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! |
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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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|
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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 that are presented in views. Instances keep track of |
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which views are dependent of them and inform them of any changes. |
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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, the dependent is |
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kept directly here, IFF there os only one. |
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Otherwise, a collection of dependents is |
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held here. |
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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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[ |
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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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dependents := IdentitySet with:dependents with:anObject |
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] |
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] |
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] valueUninterruptably |
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"Modified: 19.4.1996 / 12:24:46 / cg" |
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! |
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dependents |
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"return a Collection of dependents - nil if there is none" |
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dependents isNil ifTrue:[^ nil]. |
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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: 19.4.1996 / 12:22:04 / 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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! |
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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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[ |
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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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dependents := nil |
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] |
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] |
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] valueUninterruptably |
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"Modified: 19.4.1996 / 12:24:24 / cg" |
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! ! |
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|
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!Model methodsFor:'dependents access (non weak)'! |
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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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"Created: 19.4.1996 / 10:28:53 / cg" |
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! |
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interrests |
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"return a Collection of interrests - nil if there is none. |
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Here, we use the normal dependents collection for interrests." |
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^ self dependents |
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"Created: 19.4.1996 / 12:28:23 / cg" |
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"Modified: 19.4.1996 / 18:07:12 / cg" |
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! |
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|
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nonWeakDependents |
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"return a Collection of dependents - nil if there is none. |
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Since all dependencies are nonWeak in Model, this is a dummy." |
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^ self dependents |
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|
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"Created: 19.4.1996 / 10:29:43 / cg" |
190 | 201 |
"Modified: 19.4.1996 / 18:07:31 / cg" |
188
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! |
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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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^ self removeDependent:anObject |
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"Created: 19.4.1996 / 12:19:40 / cg" |
0 | 212 |
! ! |
213 |
||
125 | 214 |
!Model methodsFor:'drawing'! |
28 | 215 |
|
125 | 216 |
displayOn:aGraphicsContext |
217 |
"display myself in aGraphicsContext" |
|
28 | 218 |
|
125 | 219 |
^ self subclassResponsibility |
220 |
! |
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0 | 221 |
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displayOn:aGraphicsContext clippingBox:aRectangle |
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"display a part of me in aGraphicsContext" |
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||
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^ self subclassResponsibility |
|
125 | 226 |
! ! |
0 | 227 |
|
129 | 228 |
!Model class methodsFor:'documentation'! |
229 |
||
230 |
version |
|
190 | 231 |
^ '$Header: /cvs/stx/stx/libview2/Model.st,v 1.22 1996-04-19 16:07:39 cg Exp $' |
129 | 232 |
! ! |