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'From Smalltalk/X, Version:2.10.5 on 30-apr-1995 at 8:48:16 am'!
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View subclass:#ProgressIndicator
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instanceVariableNames:'percentage showPercentage fgColor'
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classVariableNames:''
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poolDictionaries:''
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category:'Views-Misc'
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!
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!ProgressIndicator class methodsFor:'documentation'!
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version
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"
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$Header: /cvs/stx/stx/libwidg2/ProgressIndicator.st,v 1.1 1995-05-03 01:11:23 claus Exp $
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"
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!
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documentation
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"
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a view showing a rectangle filled according the percentage value.
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Can be used as a progress indicator a la MSwindows.
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"
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!
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examples
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"
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typical progress indicator:
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|top p h|
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top := StandardSystemView new.
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top extent:300@100.
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top label:'Progress'.
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p := ProgressIndicator in:top.
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p origin:(0.0@0.5) corner:(1.0@0.5).
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p level:-1.
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h := p preferedExtent y.
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p topInset:(h // 2) negated;
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bottomInset:(h // 2) negated;
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leftInset:5;
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rightInset:5.
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top open.
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[
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1 to:100 do:[:val |
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(Delay forSeconds:0.05) wait.
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p percentage:val
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]
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] fork
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changing colors, turning percentage display off:
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|top p h|
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top := StandardSystemView new.
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top extent:300@100.
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top label:'Progress'.
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p := ProgressIndicator in:top.
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p origin:(0.0@0.5) corner:(1.0@0.5).
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p level:-1.
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p showPercentage:false.
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p foregroundColor:(Color red).
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h := 10.
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p topInset:(h // 2) negated;
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bottomInset:(h // 2) negated;
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leftInset:5;
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rightInset:5.
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top open.
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[
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1 to:100 do:[:val |
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(Delay forSeconds:0.05) wait.
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p percentage:val
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]
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] fork
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with border (2D look):
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|top p h|
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top := StandardSystemView new.
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top extent:300@100.
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top label:'Progress'.
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p := ProgressIndicator in:top.
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p origin:(0.0@0.5) corner:(1.0@0.5).
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p borderWidth:1.
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h := p preferedExtent y.
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p topInset:(h // 2) negated;
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bottomInset:(h // 2) negated;
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leftInset:5;
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rightInset:5.
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top open.
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[
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1 to:100 do:[:val |
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(Delay forSeconds:0.05) wait.
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p percentage:val
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]
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] fork
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getting progress from a model:
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|model top p h|
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model := 0 asValue.
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top := StandardSystemView new.
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top extent:300@100.
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top label:'Progress'.
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p := ProgressIndicator in:top.
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p model:model.
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p origin:(0.0@0.5) corner:(1.0@0.5).
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p level:-1.
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h := p preferedExtent y.
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p topInset:(h // 2) negated;
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bottomInset:(h // 2) negated;
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leftInset:5;
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rightInset:5.
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top open.
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[
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1 to:100 do:[:val |
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(Delay forSeconds:0.05) wait.
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model value:val
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]
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] fork
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concrete example:
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search all files in the source directory for a string
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using grep. Show progress while doing so.
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|top p h names done|
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top := StandardSystemView new.
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top extent:300@100.
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top label:'Searching ...'.
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p := ProgressIndicator in:top.
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p origin:(0.0@0.5) corner:(1.0@0.5).
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p level:-1.
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h := p preferedExtent y.
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p topInset:(h // 2) negated;
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bottomInset:(h // 2) negated;
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leftInset:5;
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rightInset:5.
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top openWithPriority:(Processor activePriority + 1).
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names := 'source' asFilename directoryContents.
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done := 0.
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names do:[:aName |
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|stream line|
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p percentage:(done / names size * 100).
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stream := ('source/' , aName) asFilename readStream.
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[stream atEnd] whileFalse:[
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line := stream nextLine.
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(line findString:'subclass:') ~~ 0 ifTrue:[
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Transcript showCr:line
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].
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].
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stream close.
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done := done + 1
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].
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top destroy
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"
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! !
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!ProgressIndicator methodsFor:'drawing'!
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redraw
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|s rx sx sy sw m w h|
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m := margin + 1.
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w := width - (m*2).
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h := height - (m*2).
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s := percentage printString , ' %'.
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sw := font widthOf:s.
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sx := (width - sw) // 2.
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sy := height // 2 + font descent + 2.
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rx := (w * percentage / 100) rounded.
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self paint:Color white.
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self fillRectangleX:m y:m width:w height:h.
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showPercentage ifTrue:[
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rx <= (sx+sw) ifTrue:[
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self paint:Color black.
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self displayString:s x:sx y:sy.
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]
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].
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self paint:fgColor.
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self fillRectangleX:m y:m width:rx height:h.
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showPercentage ifTrue:[
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rx >= sx ifTrue:[
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self clipRect:(m@m corner:rx+1 @ h).
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self paint:Color white.
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self displayString:s x:sx y:sy.
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self clipRect:nil
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]
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]
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! !
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!ProgressIndicator methodsFor:'initialization'!
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initialize
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super initialize.
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viewBackground := StyleSheet colorAt:'progressIndicatorViewBackground' default:Color white.
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fgColor := StyleSheet colorAt:'progressIndicatorForegroundColor' default:Color blue.
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percentage := 0.
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showPercentage := true.
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! !
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!ProgressIndicator methodsFor:'accessing'!
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percentage:aNumber
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|newPercentage|
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newPercentage := ((aNumber max:0) min:100) rounded.
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newPercentage ~~ percentage ifTrue:[
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percentage := newPercentage.
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shown ifTrue:[self redraw].
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]
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showPercentage:aBoolean
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showPercentage := aBoolean
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foregroundColor:aColor
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fgColor := aColor
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!ProgressIndicator methodsFor:'queries'!
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preferedExtent
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^ 100 @ (font height + font descent + ((margin + 1) * 2))
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!ProgressIndicator methodsFor:'change & update'!
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update:aspect with:aParameter from:changedObject
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(aspect == aspectMsg
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and:[changedObject == model]) ifTrue:[
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self percentage:(model perform:aspectMsg).
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^ self
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].
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^ super update:aspect with:aParameter from:changedObject
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! !
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