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"{ Package: 'stx:libwidg2' }"
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View subclass:#StrokeView
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instanceVariableNames:'strokes currentStroke lastPoint clearButton clearLastButton'
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classVariableNames:''
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poolDictionaries:''
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category:'Views-Special'
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!
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!StrokeView class methodsFor:'documentation'!
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documentation
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"
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a simple view, which collects strokes.
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will eventually become a character-input method
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for non-latin languages.
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"
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!
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examples
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"
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|v|
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v := StrokeView open.
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v inspect.
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|v|
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v := StrokeView openOnXScreenNamed:'bitsy:0'. ' my pda !!!! '.
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v inspect.
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"
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! !
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!StrokeView methodsFor:'button actions'!
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newStrokeSequence
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strokes removeAll.
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currentStroke := lastPoint := nil.
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self updateButtonStates.
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self redraw
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!
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removeLastStroke
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strokes size > 0 ifTrue:[
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strokes removeLast.
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].
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currentStroke := lastPoint := nil.
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self updateButtonStates.
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self redraw
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!
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updateButtonStates
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strokes isEmpty ifTrue:[
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clearButton disable.
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clearLastButton disable.
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] ifFalse:[
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clearButton enable.
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clearLastButton enable.
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]
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! !
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!StrokeView methodsFor:'event handling'!
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buttonMotion:state x:x y:y
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|thisPoint|
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state == 0 ifTrue:[^ self].
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thisPoint := x@y.
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currentStroke add:(LineSegment from:lastPoint to:thisPoint).
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self displayLineFrom:lastPoint to:thisPoint.
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lastPoint := thisPoint.
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!
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buttonPress:state x:x y:y
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currentStroke isNil ifTrue:[
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currentStroke := OrderedCollection new.
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].
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lastPoint := x@y.
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!
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buttonRelease:state x:x y:y
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currentStroke notNil ifTrue:[
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strokes add:currentStroke.
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currentStroke := nil.
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self updateButtonStates.
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].
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! !
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!StrokeView methodsFor:'initialization'!
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drawStroke:aStroke
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aStroke do:[:eachSegment |
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self displayLineFrom:(eachSegment start) to:(eachSegment end).
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].
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!
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initialize
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super initialize.
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strokes := OrderedCollection new.
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clearButton := self newButton2D.
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clearButton label:'Clear'.
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clearButton layout:(LayoutFrame
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leftFraction:0 offset:0
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rightFraction:0.5 offset:0
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topFraction:1 offset:-20
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bottomFraction:1 offset:0).
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clearButton action:[ self newStrokeSequence ].
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clearButton disable.
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clearLastButton := self newButton2D.
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clearLastButton label:'Undo'.
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clearLastButton layout:(LayoutFrame
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leftFraction:0.5 offset:0
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rightFraction:1 offset:0
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topFraction:1 offset:-20
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bottomFraction:1 offset:0).
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clearLastButton action:[ self removeLastStroke ].
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clearLastButton disable.
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!
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newButton2D
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|button|
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"
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Times Are a'Changing -
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now it takes more effort to setup a 2D button,
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than to set up a 3D one ;-)"
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button := Button in:self.
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button passiveLevel:0.
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button activeLevel:0.
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button borderWidth:1.
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button borderColor:(Color black).
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button foregroundColor:(Color black).
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button backgroundColor:(Color white).
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^ button
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!
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redraw
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self clear.
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strokes do:[:eachStroke |
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self drawStroke:eachStroke
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].
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currentStroke notNil ifTrue:[
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self drawStroke:currentStroke
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].
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! !
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!StrokeView class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libwidg2/StrokeView.st,v 1.2 2004-02-27 17:24:31 cg Exp $'
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2664
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! !
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