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"
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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 class methodsFor:'documentation'!
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copyright
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"
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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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!
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documentation
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"
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this class implements sliders - which are simply scrollers
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with a constant thumbHeight. For details on actionBlocks and
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MVC operation, see the documentation in Scroller.
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"
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!
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examples
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"
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a slider with action block (ST/X style):
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|top s|
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top := StandardSystemView new extent:200@200.
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s := Slider in:top.
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s origin:(0.0@0.0) corner:(20@1.0).
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s scrollAction:[:percent | Transcript show:'moved to: '; showCr:percent asFloat].
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top open
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same, horizontal:
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|top s|
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top := StandardSystemView new extent:200@200.
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s := HorizontalSlider in:top.
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s origin:(0.0@0.0) corner:(1.0@20).
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s scrollAction:[:percent | Transcript show:'moved to: '; showCr:percent asFloat].
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top open
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with a range other than the default:
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|top s|
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top := StandardSystemView new extent:200@200.
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s := Slider in:top.
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s origin:(0.0@0.0) corner:(20@1.0).
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s scrollAction:[:percent | Transcript show:'moved to: '; showCr:percent asFloat].
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s start:-50 stop:50.
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top open
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using a model (ST-80 style):
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(see the changing value in the inspector)
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|top s m|
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m := 0 asValue.
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m inspect.
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top := StandardSystemView new extent:200@200.
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s := Slider in:top.
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s origin:(0.0@0.0) corner:(20@1.0).
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s model:m.
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top open
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reacting to changes from the model:
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(look at and/or change value using 'self value:' in the inspector).
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|top s m|
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m := 0 asValue.
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m inspect.
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top := StandardSystemView new extent:200@200.
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s := Slider in:top.
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s origin:(0.0@0.0) corner:(20@1.0).
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s model:m.
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top open
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using a different changeSelector:
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|top s1 s2 m|
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m := Plug new.
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m respondTo:#value1: with:[:v | Transcript show:'scroller 1 moved to: '; showCr:v].
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m respondTo:#value2: with:[:v | Transcript show:'scroller 2 moved to: '; showCr:v].
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top := StandardSystemView new extent:200@200.
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s1 := Slider in:top.
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s1 origin:(0.0@0.0) corner:(20@1.0).
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s1 thumbHeight:10. 'percent'.
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s1 model:m; change:#value1:.
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s2 := Slider in:top.
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s2 origin:(30@0.0) corner:(50@1.0).
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s2 thumbHeight:10. 'percent'.
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s2 model:m; change:#value2:.
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top open
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another example:
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|top redVal greenVal blueVal
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colorVal upd s1 s2 s3 l|
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redVal := 0 asValue.
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greenVal := 0 asValue.
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blueVal := 0 asValue.
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upd := [colorVal value:(Color red:redVal value
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green:greenVal value
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blue:blueVal value)].
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colorVal := (Color red:0 green:0 blue:0) asValue.
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colorVal onChangeSend:#value to:[l backgroundColor:colorVal value].
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redVal onChangeSend:#value to:upd.
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greenVal onChangeSend:#value to:upd.
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blueVal onChangeSend:#value to:upd.
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top := StandardSystemView new extent:200@200.
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top label:'Color mixer'.
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s1 := Slider in:top.
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s1 origin:(0.0@0.0) corner:(20@1.0).
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s1 thumbHeight:10. 'percent'.
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s1 model:redVal.
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s2 := Slider in:top.
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s2 origin:(30@0.0) corner:(50@1.0).
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s2 thumbHeight:10. 'percent'.
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s2 model:greenVal.
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s3 := Slider in:top.
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s3 origin:(60@0.0) corner:(80@1.0).
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s3 thumbHeight:10. 'percent'.
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s3 model:blueVal.
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l := Label in:top.
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l origin:90@0.0 corner:1.0@1.0.
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l backgroundColor:Color black.
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top open
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the same setup, using action blocks:
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|top red green blue
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colorVal upd s1 s2 s3 labelModel l|
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red := green := blue := 0.
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top := StandardSystemView new extent:200@200.
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top label:'Color mixer'.
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s1 := Slider in:top.
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s1 origin:(0.0@0.0) corner:(20@1.0).
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s1 thumbHeight:10. 'percent'.
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s1 action:[:percent | red := percent.
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l backgroundColor:(Color red:red green:green blue:blue)].
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s2 := Slider in:top.
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s2 origin:(30@0.0) corner:(50@1.0).
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s2 thumbHeight:10. 'percent'.
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s2 action:[:percent | green := percent.
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l backgroundColor:(Color red:red green:green blue:blue)].
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s3 := Slider in:top.
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s3 origin:(60@0.0) corner:(80@1.0).
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s3 thumbHeight:10. 'percent'.
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s3 action:[:percent | blue := percent.
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l backgroundColor:(Color red:red green:green blue:blue)].
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l := Label in:top.
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l origin:90@0.0 corner:1.0@1.0.
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l backgroundColor:Color black.
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top open
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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:'forced scroll'!
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pageDown
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"ignored - a slider has no concept of page-wise scrolling"
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^ self
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!
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pageUp
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"ignored - a slider has no concept of page-wise scrolling"
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^ self
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! !
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!Slider methodsFor:'initialization'!
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initStyle
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super initStyle.
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tallyMarks := StyleSheet at:'sliderNTallyMarks' default:1.
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tallyLevel := StyleSheet at:'sliderTallyLevel' default:-1.
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!
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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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! !
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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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|fullSize|
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(orientation == #vertical) ifTrue:[
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fullSize := height
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] ifFalse:[
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fullSize := width
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].
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^ ((percent * (fullSize - sliderHeight - (margin * 2))) / 100) rounded
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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 sz m|
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thumbHeight := 0.
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sz := (self absFromPercent:thumbOrigin) + margin.
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m := margin + inset.
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(orientation == #vertical) ifTrue:[
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ny := sz.
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nh := sliderHeight.
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nx := m.
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nw := width - (2 * nx).
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] ifFalse:[
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nx := sz.
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nw := sliderHeight.
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ny := m.
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nh := height - (2 * ny).
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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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percentFromAbs:absValue
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"given a number of pixels, compute percentage"
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|fullSize val|
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(orientation == #vertical) ifTrue:[
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fullSize := height
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] ifFalse:[
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fullSize := width
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].
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val := absValue / (fullSize - sliderHeight - (margin * 2)) * (rangeEnd - rangeStart).
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val := val + rangeStart.
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val < rangeStart ifTrue:[^ rangeStart].
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val > rangeEnd ifTrue:[^ rangeEnd].
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^ val
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! !
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!Slider class methodsFor:'documentation'!
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49
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version
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318 |
^ '$Header: /cvs/stx/stx/libwidg2/Slider.st,v 1.13 1995-11-23 18:17:56 cg Exp $'
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! !
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