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PluggableAdaptor subclass:#TypeConverter
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instanceVariableNames:''
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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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!TypeConverter class methodsFor:'documentation'!
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documentation
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"
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a typeConverter can be used as an editFields model,
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to convert the fields string value to some object.
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No real new functionality is added here - all is inherited
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from PluggableAdapter; however, some specialized instance creation
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methods are added here..
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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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"
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!
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examples
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"
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convert a number to a string:
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[exBegin]
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|v t i|
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v := 1 asValue.
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t := HorizontalPanelView new.
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t extent:200@50.
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t horizontalLayout:#fitSpace.
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i := EditField in:t.
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i model:(TypeConverter onNumberValue:v).
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t open.
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(Delay forSeconds:3) wait.
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v value:2.
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[exEnd]
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convert a date to a string:
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[exBegin]
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|d v|
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v := nil asValue.
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d := DialogBox new.
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d addInputFieldOn:(TypeConverter onDateValue:v).
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d addOkButton.
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d open.
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d accepted ifTrue:[
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Transcript showCR:v value
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]
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[exEnd]
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"
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! !
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!TypeConverter class methodsFor:'instance creation'!
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onDateValue:aValueHolder
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"create and return a typeConverter, which retrieves
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a date via #value, and converts
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a date-string to a date via #value:.
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Useful as an editFields model, which operates on some
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date value (or aspectAdaptor, which adapts to a numeric slot)"
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^ (self on:aValueHolder) dateToText
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"Modified: 21.2.1997 / 18:46:11 / cg"
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"Created: 4.3.1997 / 12:30:49 / cg"
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!
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onNumberValue:aValueHolder
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"create and return a typeConverter, which retrieves
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a values string representation via #value, and converts
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a number-string to a value via #value:.
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Useful as an editFields model, which operates on some
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numeric value (or aspectAdaptor, which adapts to a numeric slot)"
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^ (self on:aValueHolder) numberToText
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"Modified: 21.2.1997 / 18:46:11 / cg"
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!
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onNumberValue:aValueHolder format:formatString
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"create and return a typeConverter, which retrieves
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a values string representation via #value, and converts
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a number-string to a value via #value:.
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Useful as an editFields model, which operates on some
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numeric value (or aspectAdaptor, which adapts to a numeric slot)"
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^ (self on:aValueHolder) numberToTextFormattedBy:formatString
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"Created: 4.3.1997 / 11:51:25 / cg"
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"Modified: 4.3.1997 / 11:51:41 / cg"
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!
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onSymbolValue:aValueHolder
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"create and return a typeConverter, which retrieves
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a symbol-values string representation via #value, and converts
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a string to a symbol via #value:.
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Useful as an editFields model, which operates on some
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numeric value (or aspectAdaptor, which adapts to a numeric slot)"
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^ (self on:aValueHolder) symbolOrNil
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"Modified: 21.2.1997 / 18:46:11 / cg"
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!
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onTimeValue:aValueHolder
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"create and return a typeConverter, which retrieves
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a time via #value, and converts
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a time-string to a time via #value:.
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Useful as an editFields model, which operates on some
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date value (or aspectAdaptor, which adapts to a numeric slot)"
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^ (self on:aValueHolder) timeToText
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"Modified: 21.2.1997 / 18:46:11 / cg"
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"Created: 4.3.1997 / 11:52:10 / cg"
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! !
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!TypeConverter methodsFor:'accessing'!
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subject
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"return the cobverted subject"
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^ model
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"Created: 21.2.1997 / 18:45:12 / cg"
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!
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value:newValue
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"convert and change"
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self setValue:newValue
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"Created: 21.2.1997 / 18:45:39 / cg"
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! !
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!TypeConverter methodsFor:'initialize-release'!
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dateOrNil
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"setup the converter to convert from a string to a date
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and vice versa."
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self
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getBlock:[:model |
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|date|
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(date := model value) isNil ifTrue:[
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''
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] ifFalse:[
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date printString
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]]
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putBlock:
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[:model :string |
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|value|
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string isEmpty ifTrue:[
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value := nil
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] ifFalse:[
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value := Date readFrom:string onError:nil
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].
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model value:value]
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updateBlock: [:m :a :p | true]
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"Created: 4.3.1997 / 11:56:36 / cg"
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"Modified: 4.3.1997 / 12:05:52 / cg"
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!
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dateToText
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"setup the converter to convert from a string to a date
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and vice versa."
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self
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getBlock:[:model |
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|date|
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(date := model value) isNil ifTrue:[
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Date today printString
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] ifFalse:[
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date printString
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]]
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putBlock:
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[:model :string |
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|value|
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string isEmpty ifTrue:[
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value := Date today
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] ifFalse:[
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value := Date readFrom:string onError:Date today
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].
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model value:value]
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updateBlock: [:m :a :p | true]
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"Modified: 21.2.1997 / 18:59:06 / cg"
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"Created: 4.3.1997 / 12:32:19 / cg"
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!
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numberOrNil
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"setup the converter to convert from a string to a number
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and vice versa. Invalid numbers are converted to nil."
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self
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getBlock:[:model |
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|numericValue|
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(numericValue := model value) isNil ifTrue:[
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String new
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] ifFalse:[
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numericValue printString
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]]
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putBlock:
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[:model :string |
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|value|
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string isEmpty ifTrue:[
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value := nil
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] ifFalse:[
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value := Number readFrom:string onError:nil
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].
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model value:value]
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updateBlock: [:m :a :p | true]
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"Created: 21.2.1997 / 18:58:38 / cg"
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!
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numberToText
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"setup the converter to convert from a string to a number
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and vice versa."
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self
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getBlock:[:model |
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|numericValue|
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(numericValue := model value) isNil ifTrue:[
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String new
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] ifFalse:[
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numericValue printString
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]]
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putBlock:
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[:model :string |
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|value|
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string isEmpty ifTrue:[
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value := 0
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] ifFalse:[
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value := string asNumber
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].
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model value:value]
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updateBlock: [:m :a :p | true]
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"Created: 21.2.1997 / 18:57:05 / cg"
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"Modified: 4.3.1997 / 11:50:29 / cg"
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!
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numberToTextFormattedBy:formatString
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"setup the converter to convert from a string to a number
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and vice versa, using formatString.
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The formatString is currently ignored when numbers are converted
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from a string."
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self
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getBlock:[:model |
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|numericValue|
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(numericValue := model value) isNil ifTrue:[
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String new
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] ifFalse:[
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PrintConverter print:numericValue formattedBy:formatString
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]]
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putBlock:
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[:model :string |
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|value|
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string isEmpty ifTrue:[
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value := 0
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] ifFalse:[
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value := string asNumber "asNumberFromFormatString:formatString"
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].
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model value:value]
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updateBlock: [:m :a :p | true]
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"Modified: 21.2.1997 / 18:59:44 / cg"
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!
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symbolOrNil
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"setup the converter to convert from a string to a symbol
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and vice versa. Invalid symbols (i.e. empty) are converted to nil."
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self
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getBlock:[:model |
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|symbolValue|
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(symbolValue := model value) isNil ifTrue:[
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String new
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] ifFalse:[
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'#' , symbolValue asString
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]]
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putBlock:
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[:model :string |
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|value s|
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string isEmpty ifTrue:[
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value := nil
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] ifFalse:[
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s := string withoutSeparators.
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(s startsWith:'#') ifTrue:[
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s := s copyFrom:2
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].
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value := s asSymbol
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].
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model value:value]
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updateBlock: [:m :a :p | true]
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"Created: 21.2.1997 / 18:58:38 / cg"
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!
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timeOrNil
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"setup the converter to convert from a string to a time
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and vice versa."
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self
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getBlock:[:model |
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|time|
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(time := model value) isNil ifTrue:[
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''
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] ifFalse:[
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time printString
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]]
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putBlock:
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[:model :string |
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|value|
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string isEmpty ifTrue:[
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value := nil
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] ifFalse:[
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value := Time readFrom:string onError:nil
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].
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model value:value]
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updateBlock: [:m :a :p | true]
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"Created: 4.3.1997 / 11:52:47 / cg"
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"Modified: 4.3.1997 / 12:05:48 / cg"
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!
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timeToText
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"setup the converter to convert from a string to a time
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and vice versa."
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self
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getBlock:[:model |
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|time|
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(time := model value) isNil ifTrue:[
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Time now printString
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] ifFalse:[
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time printString
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]]
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putBlock:
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[:model :string |
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|value|
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string isEmpty ifTrue:[
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value := Time now
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] ifFalse:[
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value := Time readFrom:string onError:Time now
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].
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model value:value]
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updateBlock: [:m :a :p | true]
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"Modified: 21.2.1997 / 18:59:06 / cg"
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"Created: 4.3.1997 / 11:52:47 / cg"
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! !
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!TypeConverter class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/TypeConverter.st,v 1.5 1997-03-04 19:17:56 cg Exp $'
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! !
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