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"
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COPYRIGHT (c) 1994 by eXept Software AG
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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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ValueHolder subclass:#RangeAdaptor
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instanceVariableNames:'subject rangeStart rangeStop grid'
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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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!RangeAdaptor class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1994 by eXept Software AG
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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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Range Adaptor is a kind of UpdateAdaptor that can be used to turn an
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arbitrary number (either an Integer or a Float) into a Float normalized between
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0 and 1.
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"
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! !
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!RangeAdaptor class methodsFor:'instance creation'!
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on:aSubject start:aStart stop:aStop grid:aGrid
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|inst|
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inst := self new.
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inst subject:aSubject.
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inst rangeStart:aStart.
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inst rangeStop:aStop.
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inst grid:aGrid.
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^ inst
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"Modified: 11.10.1997 / 16:29:35 / cg"
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!
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on:aSubject stop:aStop
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^ self on:aSubject start:0 stop:aStop grid:nil
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!
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on:aSubject stop:aStop grid:aGrid
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^ self on:aSubject start:0 stop:aStop grid:aGrid
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! !
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!RangeAdaptor methodsFor:'accessing'!
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grid
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"return the value of the instance variable 'grid' (automatically generated)"
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^ grid!
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grid:something
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"set the value of the instance variable 'grid' (automatically generated)"
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grid := something.!
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rangeStart
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"return the value of the instance variable 'rangeStart' (automatically generated)"
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^ rangeStart!
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rangeStart:something
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"set the value of the instance variable 'rangeStart' (automatically generated)"
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rangeStart := something.!
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rangeStop
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"return the value of the instance variable 'rangeStop' (automatically generated)"
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^ rangeStop!
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rangeStop:something
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"set the value of the instance variable 'rangeStop' (automatically generated)"
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rangeStop := something.!
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setValue:aNumber
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"physically set my value, without change notifications
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"
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|n|
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n := aNumber.
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subject notNil ifTrue:[
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n := (aNumber * (rangeStop - rangeStart)) + rangeStart.
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grid notNil ifTrue:[n := n roundTo:grid].
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subject setValue:n.
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].
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super setValue:n
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!
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subject
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^ subject
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!
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subject:aValue
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dependents notNil ifTrue:[
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subject notNil ifTrue:[subject removeDependent:self].
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aValue notNil ifTrue:[subject addDependent:self].
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].
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subject := aValue
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!
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value
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"return my value"
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(subject isNil or:[rangeStart == rangeStop]) ifTrue:[
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^ 0
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].
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^ (subject value - rangeStart) asFloat / (rangeStop - rangeStart)
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value:aNumber
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"physically set my value, without change notifications
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"
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|oldValue|
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oldValue := subject value.
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super value:aNumber.
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subject value ~~ oldValue ifTrue:[
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subject changed:#value
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]
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! !
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!RangeAdaptor methodsFor:'actions'!
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decrement
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(grid notNil and:[subject notNil]) ifTrue:[
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self value:(subject value - grid max:rangeStart)
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]
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!
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increment
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(grid notNil and:[subject notNil]) ifTrue:[
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self value:(subject value + grid min:rangeStop)
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]
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! !
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!RangeAdaptor 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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something == #value ifTrue:[
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self changed:#value
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]
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! !
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!RangeAdaptor 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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(subject notNil and:[dependents isNil]) ifTrue:[
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subject addDependent:self
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].
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super addDependent:anObject
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!
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release
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"remove all dependencies from the receiver
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"
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(subject notNil and:[dependents notNil]) ifTrue:[
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subject removeDependent:self
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].
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super release.
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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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dependents notNil ifTrue:[
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super removeDependent:anObject.
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dependents isNil ifTrue:[
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subject removeDependent:self
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]
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].
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! !
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!RangeAdaptor methodsFor:'initialization'!
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initialize
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super initialize.
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rangeStart := 0.
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rangeStop := 0.
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! !
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!RangeAdaptor methodsFor:'private'!
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setSubjectsValue:aNewValue
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subject value:aNewValue.
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self changed:#value
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! !
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!RangeAdaptor class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/RangeAdaptor.st,v 1.1 1997-10-11 14:32:02 cg Exp $'
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! !
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