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"
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COPYRIGHT (c) 1992-93 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'
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!
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Model comment:'
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COPYRIGHT (c) 1992-93 by Claus Gittinger
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All Rights Reserved
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Model are things that can be displayed in a view. I keep track of
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which views are dependeent of me and inform them of any changes.
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I know how to display myself in a GraphicsContext.
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This was written to be more ST-80 conform.
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Instance variables:
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dependentViews Collection the views knowing me
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$Header: /cvs/stx/stx/libview2/Model.st,v 1.2 1993-10-13 00:46:11 claus Exp $
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written summer 92 by claus
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'!
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!Model methodsFor:'accessing'!
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addDependent:aView
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"make the argument, anObject be dependent of the receiver"
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dependents isNil ifTrue:[
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dependents := IdentitySet new
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].
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dependents add:aView
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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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dependents notNil ifTrue:[
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dependents remove:anObject ifAbsent:[]
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]
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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
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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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! !
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!Model methodsFor:'events'!
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changed:something with:arguments
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dependents notNil ifTrue:[
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dependents do:[:someOne |
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someOne update:something with:arguments
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]
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]
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!
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changed:something
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dependents notNil ifTrue:[
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dependents do:[:someOne |
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someOne update:something
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]
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]
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!
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changed
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dependents notNil ifTrue:[
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dependents do:[:someOne |
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someOne update:self
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]
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]
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! !
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!Model methodsFor:'drawing'!
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displayOn:aGraphicsContext clippingBox:aRectangle
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"display a part of me in aGraphicsContext"
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^ self subclassResponsibility
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!
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displayOn:aGraphicsContext
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"display myself in aGraphicsContext"
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^ self subclassResponsibility
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! !
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