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SimpleView subclass:#VisualRegion
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instanceVariableNames:'isElliptical isOpaque'
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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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!VisualRegion class methodsFor:'documentation'!
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documentation
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"
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VisualRegion is a passive visual component which provides a rectangular or elliptical
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shape. It can take an arbitrary border line thicknesses and can be defined as opaque
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with a background color or non opaque.
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- it may not be complete or compatible to the corresponding ST-80 class.
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If you encounter any incompatibilities, please forward a note
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describing the incompatibility verbal (i.e. no code) to the ST/X team.
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"
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!
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examples
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"
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|top s1 s2 s3 s4 v1 rd|
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top := StandardSystemView new extent:250@250.
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rd := false.
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v1 := View origin:25@25 extent:50@50 in:top.
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v1 viewBackground:(Color blue).
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s1 := VisualRegion origin:10@10 extent:30@30 in:top.
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s1 lineWidth:0.
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s1 viewBackground:(Color gray:90).
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s1 isElliptical:rd.
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s2 := VisualRegion origin:60@10 extent:30@30 in:top.
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s2 viewBackground:(Color gray:80).
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s2 lineWidth:1.
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s2 isElliptical:rd.
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s3 := VisualRegion origin:10@60 extent:100@30 in:top.
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s3 viewBackground:(Color gray:70).
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s3 lineWidth:0.
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s3 isOpaque:false.
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s3 isElliptical:rd.
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s4 := VisualRegion origin:60@60 extent:30@30 in:top.
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s4 viewBackground:(Color gray:60).
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s4 lineWidth:1.
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s4 isOpaque:false.
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s4 isElliptical:rd.
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top open
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"
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! !
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!VisualRegion methodsFor:'accessing'!
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isElliptical
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"get the outline of the region; elliptical or rectangle
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"
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^ isElliptical
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!
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isElliptical:aBoolean
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"set the outline of the region; elliptical or rectangle
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"
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(isElliptical ~~ aBoolean) ifTrue:[
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isElliptical := aBoolean.
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self layoutChanged
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].
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!
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isOpaque
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"get opaque mode concerning the inner background of the region
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"
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^ isOpaque
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!
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isOpaque:aBoolean
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"set opaque mode concerning the inner background of the region
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"
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(isOpaque ~~ aBoolean) ifTrue:[
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isOpaque := aBoolean.
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self layoutChanged
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].
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!
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lineWidth:aNumber
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"set the border drawing width in pixels
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"
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lineWidth ~~ aNumber ifTrue:[
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super lineWidth:aNumber.
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self layoutChanged
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]
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!
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setLineWidth:aNumber
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"set the line drawing width in pixels without recomputation of the shape
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"
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super lineWidth:aNumber
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! !
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!VisualRegion methodsFor:'change & update'!
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sizeChanged:how
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"must compute a new shape, when size is changed
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"
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self computeShape.
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super sizeChanged:how
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! !
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!VisualRegion methodsFor:'initialization'!
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initialize
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"setup default configuration
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"
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super initialize.
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isElliptical := false.
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isOpaque := true.
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self computeShape
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! !
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!VisualRegion methodsFor:'private'!
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layoutChanged
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"recompute shape and change to invalidate
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"
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self computeShape.
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self invalidate
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! !
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!VisualRegion methodsFor:'queries'!
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specClass
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^ RegionSpec
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! !
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!VisualRegion methodsFor:'shape computation'!
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computeShape
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"computes 2 forms, one for the border, the other for the inside area. The border
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form is borderwidth*2 pixels larger. Each form gets filled with an ellipse of
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1-pixels, to define the shapes (take a look at the XShape spec, for more info)
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"
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|border shape extent form|
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extent := self extent.
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border := Form extent:extent.
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shape := Form extent:extent.
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isElliptical ifTrue:[
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border fillArcX:0 y:0
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width:(border width)
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height:(border height)
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from:0
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angle:360.
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] ifFalse:[
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border fillRectangleX:0 y:0
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width:(border width)
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height:(border height)
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].
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isOpaque ifFalse:[
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form := border.
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border foreground:(Color colorId:0).
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] ifTrue:[
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form := shape.
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shape foreground:(Color colorId:1).
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].
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isElliptical ifTrue:[
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form fillArcX:lineWidth y:lineWidth
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width:(border width) - (lineWidth * 2)
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height:(border height) - (lineWidth * 2)
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from:0
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angle:360.
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] ifFalse:[
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form fillRectangleX:lineWidth y:lineWidth
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width:(border width) - (lineWidth * 2)
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height:(border height) - (lineWidth * 2).
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].
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self borderShape:border.
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self viewShape:shape.
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! !
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!VisualRegion class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/VisualRegion.st,v 1.1 1997-06-16 09:32:57 ca Exp $'
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! !
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