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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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ProtocolAdaptor subclass:#AspectAdaptor
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instanceVariableNames:'myAspect getMsg putMsg'
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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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!AspectAdaptor 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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an AspectAdaptor forwards updates and change messages
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from/to a complex model.
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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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Without an aspect adaptor, you needed to copy the individual
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values out-of and into multiple valueHolders.
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An aspectAdaptor makes this easier, by playing model with
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value/value: symbols towards the editField, and forwarding changes and
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updates to/from the complex model using different aspect symbols.
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Notice:
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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.
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If you encounter any incompatibilities, please forward a note
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describing the incompatibility verbal (i.e. no code) to the ST/X team.
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[author:]
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Claus Gittinger
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[see also:]
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ValueHolder Model
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"
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!
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examples
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"
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a dialog on a points x/y coordinates:
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[exBegin]
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|dialog data f|
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data := 0@0.
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dialog := DialogBox new.
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dialog addTextLabel:'x:'.
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f := dialog addInputFieldOn:(AspectAdaptor new
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subject:data;
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accessWith:#x
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assignWith:#x:).
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f converter:(PrintConverter new initForNumber).
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dialog addTextLabel:'y:'.
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f := dialog addInputFieldOn:(AspectAdaptor new
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subject:data;
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forAspect:#y).
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f converter:(PrintConverter new initForNumber).
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dialog addOkButton.
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data inspect.
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dialog open.
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dialog accepted ifTrue:[
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Transcript showCr:'data now: ' , data printString
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]
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[exEnd]
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a dialog on a four-field complex model:
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[exBegin]
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|dialog data dataModel|
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data := #('hello' 'one' 'two' 'three').
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dataModel := Plug new.
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dataModel respondTo:#field1 with:[data at:1].
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dataModel respondTo:#field2 with:[data at:2].
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dataModel respondTo:#field3 with:[data at:3].
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dataModel respondTo:#field4 with:[data at:4].
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dataModel respondTo:#field1: with:[:arg | data at:1 put:arg].
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dataModel respondTo:#field2: with:[:arg | data at:2 put:arg].
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dataModel respondTo:#field3: with:[:arg | data at:3 put:arg].
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dataModel respondTo:#field4: with:[:arg | data at:4 put:arg].
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dialog := DialogBox new.
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dialog addTextLabel:'1:'.
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dialog addInputFieldOn:(AspectAdaptor new
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subject:dataModel;
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accessWith:#field1
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assignWith:#field1:).
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dialog addTextLabel:'2:'.
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dialog addInputFieldOn:(AspectAdaptor new
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subject:dataModel;
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forAspect:#field2).
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dialog addTextLabel:'3:'.
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dialog addInputFieldOn:(AspectAdaptor new
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subject:dataModel;
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accessWith:#field3
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assignWith:#field3:
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aspect:#field3).
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dialog addTextLabel:'4:'.
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dialog addInputFieldOn:(AspectAdaptor new
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subject:dataModel;
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forAspect:#field4).
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dialog addOkButton.
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dataModel inspect.
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dialog open.
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dialog accepted ifTrue:[
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Transcript showCr:'data now: ' , data printString
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]
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[exEnd]
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"
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! !
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!AspectAdaptor class methodsFor:'instance creation'!
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accessWith:getSelector assignWith:putSelector
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"create and return an adaptor which uses getSelector to fetch a value
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and setSelector to change it."
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^ (self new) accessWith:getSelector assignWith:putSelector
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!
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subject:anObject sendsUpdates:aBoolean accessWith:getSel assignWith:putSel aspect:aspect
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^ (self subject:anObject sendsUpdates:aBoolean)
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accessWith:getSel assignWith:putSel aspect:aspect
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! !
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!AspectAdaptor methodsFor:'accessing-spec'!
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accessWith:getSelector assignWith:putSelector
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"setup the recevier to use getSelector to fetch a value
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and setSelector to change it."
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getMsg := getSelector.
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putMsg := putSelector
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!
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accessWith:getSelector assignWith:putSelector aspect:aspectSymbol
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"setup the recevier to use getSelector to fetch a value
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and setSelector to change it."
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getMsg := getSelector.
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putMsg := putSelector.
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myAspect := aspectSymbol
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!
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forAspect
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myAspect isNil ifTrue:[
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^ getMsg
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].
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^ myAspect
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!
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forAspect:aSelector
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getMsg := myAspect := aSelector.
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putMsg := (aSelector , ':') asSymbol.
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! !
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!AspectAdaptor methodsFor:'accessing-value'!
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setValue:newValue
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|target oldValue|
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target := super value.
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oldValue := target perform:getMsg.
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oldValue ~~ newValue ifTrue:[
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target perform:putMsg with:newValue.
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]
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!
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value
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"translate a query for my value from my user
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into an aspect access towards my subject"
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|target|
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target := super value.
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^ target perform:getMsg
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!
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value:newValue
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|target oldValue|
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target := super value.
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oldValue := target perform:getMsg.
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oldValue ~~ newValue ifTrue:[
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target perform:putMsg with:newValue.
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subjectSendsUpdates ifFalse:[
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self changed:#value
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]
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]
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! !
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!AspectAdaptor methodsFor:'change & update'!
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update:something with:aParameter from:changedObject
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"translate an update from the model into a #value-change
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via my depenedents ..."
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((changedObject == subject)
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or:[changedObject == subjectChannel]) ifTrue:[
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something == self forAspect ifTrue:[
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self changed:#value
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].
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^ self
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].
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! !
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!AspectAdaptor class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/AspectAdaptor.st,v 1.12 1996-04-27 17:58:52 cg Exp $'
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! !
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