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COPYRIGHT (c) 1992 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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Scroller subclass:#Slider
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instanceVariableNames:'sliderHeight'
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classVariableNames: ''
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poolDictionaries:''
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category:'Views-Interactors'
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!
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Slider comment:'
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COPYRIGHT (c) 1992 by Claus Gittinger
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All Rights Reserved
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this class implements sliders - which are simply scrollers
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with a constant thumbHeight and a sligthly different way of
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drawing.
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Instance variables:
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$Header: /cvs/stx/stx/libwidg2/Slider.st,v 1.4 1994-01-08 17:29:54 claus Exp $
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written summer 92 by claus
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'!
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!Slider methodsFor:'initialization'!
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initialize
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sliderHeight := (self verticalPixelPerMillimeter:10) rounded.
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super initialize.
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thumbHeight := 0
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8
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!
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initStyle
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super initStyle.
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tallyMarks := 1.
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style == #iris ifTrue:[
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tallyLevel := 1.
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] ifFalse:[
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tallyLevel := -1.
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]
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! !
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!Slider methodsFor:'accessing'!
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thumbHeight
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"redefined since a slider has no height - just origin"
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^ nil
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! !
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!Slider methodsFor:'private'!
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absFromPercent:percent
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"given a percentage, compute number of pixels"
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^ ((percent * (height - sliderHeight - (margin * 2))) / 100) rounded
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!
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percentFromAbs:absValue
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"given a number of pixels, compute percentage"
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|val|
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val := absValue / (height - sliderHeight - (margin * 2)) * 100.
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val < 0 ifTrue:[^ 0].
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val > 100 ifTrue:[^ 100].
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^ val
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!
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computeThumbFrame
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"redefined, since the thumb-height stays constant"
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|nh nw ny nx|
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thumbHeight := 0.
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ny := (self absFromPercent:thumbOrigin) + margin.
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nh := sliderHeight.
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self is3D ifTrue:[
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nx := margin.
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nw := width - (2 * margin)
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] ifFalse:[
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nx := inset.
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nw := width - (inset * 2)
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].
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"
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do not create new Rectangle if its the same anyway
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"
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thumbFrame notNil ifTrue:[
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(ny == thumbFrame top) ifTrue:[
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(nx == thumbFrame left) ifTrue:[
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(nh == thumbFrame height) ifTrue:[
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(nw == thumbFrame width) ifTrue:[ ^ self]
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]
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]
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]
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].
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thumbFrame := Rectangle left:nx top:ny width:nw height:nh
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! !
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