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'From Smalltalk/X, Version:2.10.3 on 12-aug-1994 at 10:44:09 pm'!
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Object subclass:#TabulatorSpecification
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instanceVariableNames:'tabUnit tabPositions tabTypes'
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classVariableNames:''
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poolDictionaries:''
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category:'Views-Support'
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!
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!TabulatorSpecification methodsFor:'queries'!
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pixelsPerUnitOn:aGC
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"
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return the number of device pixels one unit of my tabs
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takes on aGC
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"
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tabUnit isNil ifTrue:[
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tabUnit := #col
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].
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tabUnit == #col ifTrue:[
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^ aGC font width
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].
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tabUnit == #inch ifTrue:[
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^ aGC device horizontalPixelPerInch
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].
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tabUnit == #mm ifTrue:[
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^ aGC device horizontalPixelPerMillimeter
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].
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tabUnit == #cm ifTrue:[
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^ aGC device horizontalPixelPerMillimeter * 10
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].
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"
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assume pixels
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"
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^ 1.
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!
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positionOfTab:index on:aGC
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|unit pos|
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tabPositions isNil ifTrue:[^ nil].
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unit := self pixelsPerUnitOn:aGC.
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pos := ((tabPositions at:index) * unit).
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^ pos
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!
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positionOfTab:index forString:aString on:aGC
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|pos type idx left|
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pos := self positionOfTab:index on:aGC.
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pos isNil ifTrue:[^ nil].
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tabTypes notNil ifTrue:[
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(tabTypes isMemberOf:Symbol) ifTrue:[
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type := tabTypes
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] ifFalse:[
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type := tabTypes at:(index).
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].
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] ifFalse:[
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type := #left
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].
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type == #right ifTrue:[
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^ pos - (aGC font widthOf:aString).
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].
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type == #center ifTrue:[
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^ pos - ((aGC font widthOf:aString) // 2).
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].
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type == #decimal ifTrue:[
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idx := aString indexOf:$..
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idx == 0 ifTrue:[
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^ pos - (aGC font widthOf:aString).
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].
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left := aString copyTo:(idx-1).
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^ pos - (aGC font widthOf:left).
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].
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"default is left"
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^ pos
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! !
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!TabulatorSpecification methodsFor:'accessing'!
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unit:aSymbol
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"allowed are: #inch, #mm, #cm, #pixel and #col"
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tabUnit := aSymbol
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unit
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^ tabUnit
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!
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align:types
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"
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an array of tab-types; each one is
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#left
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#right
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#center
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#decimal
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or a symbol which gives align of all tabs
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"
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tabTypes := types
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!
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align
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^ tabTypes
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!
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positions:tabs
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tabPositions := tabs
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!
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positions
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^ tabPositions
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! !
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