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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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ValueModel subclass:#ProtocolAdaptor
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instanceVariableNames:'accessPath subject subjectChannel subjectSendsUpdates'
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classVariableNames:''
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poolDictionaries:''
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category:'Interface-Support-Models'
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69
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!
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!ProtocolAdaptor 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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69
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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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a ProtocolAdaptor allows access to embeded values in a
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complex model and plays model towards the outside world.
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Consider the case where editFields are required for the
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elements (instance variables) of a more complex model.
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Using ValueHolders, you had to copy the individual
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values out-of and into multiple valueHolders.
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A protocolAdaptor makes this easier, by playing model towards
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the editField, returning a value from the complex model,
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and forwards changes to the complex model.
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Notice: since you can specify the aspect- and changeSymbols in most ST/X
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widgets, ProtocolAdapters are not always needed (at least, if no access-
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path is required).
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However, if you want to apply widgets on objects which where not originally
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designed as models (such as Arrays), ProtocolAdapters are very useful.
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Notice: this class was implemented using protocol information
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from alpha testers - it may not be complete or compatible to
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the corresponding ST-80 class. If you encounter any incompatibilities,
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please forward a note to the ST/X team.
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"
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!
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examples
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"
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|a obj|
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a := ProtocolAdaptor accessPath:#(1 2 3).
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obj := Array with:#(11 (121 122 123) 13)
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with:#(21 (221 222 223) 23)
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with:#(33 (321 322 323) 33).
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a valueUsingSubject:obj
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|a obj|
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a := ProtocolAdaptor accessPath:#(1 2 origin).
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obj := Array with:(Array with:1@1 with:(1@2 corner:100@100))
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with:(Array with:2@1 with:2@2)
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with:(Array with:3@1 with:3@2).
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a valueUsingSubject:obj
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|a model|
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a := ProtocolAdaptor accessPath:#(1 2 origin).
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model := (Array with:(Array with:1@1 with:(1@2 corner:100@100))
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with:(Array with:2@1 with:2@2)
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with:(Array with:3@1 with:3@2)) asValue.
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a subjectChannel:model.
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a value
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"
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! !
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!ProtocolAdaptor class methodsFor:'instance creation'!
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accessPath:aCollectionOfSelectors
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^ (self new) accessPath:aCollectionOfSelectors
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!
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subject:anObject
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^ (self new) subject:anObject
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!
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subject:anObject accessPath:aCollectionOfSelectors
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^ (self new) subject:anObject; accessPath:aCollectionOfSelectors
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!
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subject:anObject sendsUpdates:aBoolean
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^ (self new) subject:anObject; subjectSendsUpdates:aBoolean
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"Modified: 18.4.1996 / 01:45:34 / cg"
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!
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subject:anObject sendsUpdates:aBoolean accessPath:aCollectionOfSelectors
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^ (self new) subject:anObject; subjectSendsUpdates:aBoolean; accessPath:aCollectionOfSelectors
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"Modified: 18.4.1996 / 01:45:38 / cg"
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!
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subjectChannel:aValueHolder
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^ (self new) subjectChannel:aValueHolder
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!
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subjectChannel:aValueHolder accessPath:aCollectionOfSelectors
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^ (self new) subjectChannel:aValueHolder; accessPath:aCollectionOfSelectors
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!
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subjectChannel:aValueHolder sendsUpdates:aBoolean
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^ (self new) subjectChannel:aValueHolder; subjectSendsUpdates:aBoolean
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"Modified: 18.4.1996 / 01:45:45 / cg"
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!
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subjectChannel:aValueHolder sendsUpdates:aBoolean accessPath:aCollectionOfSelectors
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^ (self new) subjectChannel:aValueHolder; subjectSendsUpdates:aBoolean; accessPath:aCollectionOfSelectors
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"Modified: 18.4.1996 / 01:45:50 / cg"
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! !
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!ProtocolAdaptor methodsFor:'accessing'!
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setValue:newValue
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"set the value in my subject or subjectChannel."
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|obj|
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subject notNil ifTrue:[
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obj := subject.
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] ifFalse:[
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obj := subjectChannel value
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].
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^ self setValue:newValue usingSubject:obj
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!
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setValue:newValue usingSubject:anObject
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"set a value in anObject, using the selectors in accessPath.
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A helper for setValue:."
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|obj lastIndex|
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obj := anObject.
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lastIndex := accessPath size.
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accessPath keysAndValuesDo:[:idx :aSelectorOrIndex |
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aSelectorOrIndex isInteger ifTrue:[
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idx == lastIndex ifTrue:[
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obj at:aSelectorOrIndex put:newValue
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] ifFalse:[
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obj := obj at:aSelectorOrIndex
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]
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] ifFalse:[
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idx == lastIndex ifTrue:[
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obj perform:(aSelectorOrIndex , ':') asSymbol with:newValue
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] ifFalse:[
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obj := obj perform:aSelectorOrIndex
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]
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]
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].
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^ newValue
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!
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value
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"return the value from my subject or subjectChannel."
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|obj|
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subject notNil ifTrue:[
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obj := subject.
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] ifFalse:[
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obj := subjectChannel value
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].
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^ self valueUsingSubject:obj
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!
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valueUsingSubject:anObject
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"return the value from anObject, using the selectors in accessPath.
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A helper for value."
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|obj|
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obj := anObject.
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accessPath notNil ifTrue:[
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accessPath do:[:aSelectorOrIndex |
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aSelectorOrIndex isInteger ifTrue:[
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obj := obj at:aSelectorOrIndex
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] ifFalse:[
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obj := obj perform:aSelectorOrIndex
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]
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].
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].
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^ obj
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! !
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!ProtocolAdaptor methodsFor:'accessing-spec'!
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accessPath
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^ accessPath
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!
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accessPath:aCollectionOfSelectors
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accessPath := aCollectionOfSelectors
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!
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subject
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^ subject
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!
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subject:anObject
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subject notNil ifTrue:[
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subject removeDependent:self
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].
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subject := anObject.
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self changed:#value.
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subject notNil ifTrue:[
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subject addDependent:self
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].
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!
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subjectChannel
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^ subjectChannel
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!
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subjectChannel:aValueHolder
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|oldChannel|
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subjectChannel notNil ifTrue:[
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subjectChannel removeDependent:self
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].
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oldChannel := subjectChannel.
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subjectChannel := aValueHolder.
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subjectChannel notNil ifTrue:[
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subjectChannel addDependent:self
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].
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oldChannel notNil ifTrue:[
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self changed:#value.
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].
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"Modified: 6.9.1995 / 01:19:27 / claus"
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!
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subjectSendsUpdates
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"return true, if the subject sends updates itself
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If true, the receiver will not send updates on changes"
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^ subjectSendsUpdates
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!
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subjectSendsUpdates:aBoolean
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"set/clear the flag which states if the subject sends updates itself.
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If true, the receiver will not send updates on changes"
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subjectSendsUpdates := aBoolean.
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! !
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!ProtocolAdaptor methodsFor:'change & update'!
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update:something with:aPArameter from:changedObject
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"translate updates from my subject into value-changes towards
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my dependents. Since I have no specific aspect, every change is forwarded"
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(changedObject == subject
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or:[changedObject == subjectChannel]) ifTrue:[
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self changed:#value.
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^ self
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].
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! !
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!ProtocolAdaptor methodsFor:'change notification'!
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changed:aspect
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subjectSendsUpdates ifFalse:[
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super changed:aspect
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]
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! !
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!ProtocolAdaptor methodsFor:'initialization'!
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initialize
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super initialize.
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subjectSendsUpdates := false.
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! !
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!ProtocolAdaptor class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/ProtocolAdaptor.st,v 1.10 1996-04-17 23:56:10 cg Exp $'
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! !
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