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"
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COPYRIGHT (c) 1989 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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Object subclass:#DisplayObject
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instanceVariableNames:'frame'
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classVariableNames:''
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poolDictionaries:''
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category:'Graphics-Display Objects'
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!
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!DisplayObject class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1989 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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generic superclass for Display Objects held in ObjectViews
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see DrawObject/LogicObject/DeskTopObject and subclasses for example use
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"
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!
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version
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^ '$Header: /cvs/stx/stx/libview2/DisplayObject.st,v 1.15 1995-11-23 01:26:40 cg Exp $'
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! !
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!DisplayObject class methodsFor:'instance creation'!
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new
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^ self basicNew initialize
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! !
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!DisplayObject class methodsFor:'behavior'!
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dragOutline
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"if true, dragging is done by drawing outline only;
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if false, dragging is done by full draw (fast servers only)
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- can be redefined in subclasses"
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^ true
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! !
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!DisplayObject methodsFor:'ST-80 drawing'!
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displayOn: aDisplayMedium
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self displayOn:aDisplayMedium
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at:0@0
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clippingBox:nil
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rule:#copy
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mask:nil
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!
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displayOn:aDisplayMedium at:aPoint
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self displayOn:aDisplayMedium
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at:aPoint
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clippingBox:nil
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rule:#copy
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mask:nil
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!
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displayOn:aDisplayMedium at:aPoint clippingBox:clipRectangle
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^ self displayOn:aDisplayMedium
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at:aPoint
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clippingBox:clipRectangle
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rule:#copy
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mask:nil
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!
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displayOn:aDisplayMedium at:aPoint clippingBox:clip rule:rule mask: aForm
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"in ST-80 programs, this is redefined"
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aDisplayMedium function:rule.
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^ self drawIn:aDisplayMedium
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at:(aPoint + self origin)
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! !
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!DisplayObject methodsFor:'accessing'!
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corner
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"return the frame corner"
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frame isNil ifTrue:[
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frame := self computeBoundingBox
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].
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^ frame corner
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!
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extent
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"return the extent of the frame"
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frame isNil ifTrue:[
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frame := self computeBoundingBox
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].
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^ frame extent
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frame
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"object must return a frame boundary rectangle"
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frame isNil ifTrue:[
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frame := self computeBoundingBox
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].
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^ frame
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height
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"return the height of the frame"
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frame isNil ifTrue:[
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frame := self computeBoundingBox
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].
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^ frame height
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origin
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"return the frame origin"
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frame isNil ifTrue:[
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frame := self computeBoundingBox
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].
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^ frame origin
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origin:origin
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"object must calculate its dimension from outline"
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^ self subclassResponsibility
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origin:origin corner:corner
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"object must calculate its dimension from outline"
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^ self subclassResponsibility
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!
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width
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"return the width of the frame"
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frame isNil ifTrue:[
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frame := self computeBoundingBox
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].
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^ frame width
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! !
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!DisplayObject methodsFor:'converting'!
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asDisplayObject
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^ self
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! !
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!DisplayObject methodsFor:'drawing'!
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drawDragIn:aView
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self class dragOutline ifTrue:[
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self drawOutlineIn:aView offset:(0 @ 0)
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] ifFalse: [
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self drawIn:aView offset:(0 @ 0)
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]
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!
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drawDragIn:aView at:drawOrigin
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"draw the receiver for dragging"
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self class dragOutline ifTrue:[
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self drawOutlineIn:aView offset:(drawOrigin - (self origin))
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] ifFalse: [
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self drawIn:aView offset:(drawOrigin - (self origin))
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]
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!
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drawDragIn:aView offset:drawOrigin
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self class dragOutline ifTrue:[
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self drawOutlineIn:aView offset:drawOrigin
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] ifFalse: [
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self drawIn:aView offset:drawOrigin
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]
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!
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drawIn:aView
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"draw the receiver at its origin"
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self drawIn:aView offset:(0@0)
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!
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drawIn:aView at:drawOrigin
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"draw the receiver at drawOrigin, aPoint"
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self drawIn:aView offset:(drawOrigin - (self origin))
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!
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drawIn:aView offset:anOffset
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"draw the receiver at its origin offset by anOffset, aPoint"
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^ self subclassResponsibility
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!
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drawOutlineIn:aView
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"draw the receivers outline at its origin"
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self drawOutlineIn:aView offset:(0@0)
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!
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drawOutlineIn:aView at:drawOrigin
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"draw the receivers outline at drawOrigin, aPoint"
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self drawOutlineIn:aView offset:(drawOrigin - self origin)
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!
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drawOutlineIn:aView offset:anOffset
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"draw the receivers outline at its origin offset by anOffset, aPoint"
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|org|
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org := self origin + anOffset.
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aView displayRectangleX:org x y:org y
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width:frame width height:frame height
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!
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drawSelectedIn:aView
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"draw the receiver highlighted at its position"
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self drawSelectedIn:aView offset:(0@0)
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!
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drawSelectedIn:aView offset:anOffset
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"draw the receiver highlighted - this is usually redefined"
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self drawIn:aView offset:anOffset.
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self drawOutlineIn:aView offset:anOffset
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! !
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!DisplayObject methodsFor:'initialization'!
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computeBoundingBox
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"compute my boundingBox into the local variable 'frame'.
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The box should be computed for Display."
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^ self subclassResponsibility
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!
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computeBoundingBoxFor:aDevice
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"compute my boundingBox into the local variable 'frame'.
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The box is to be computed for aDevice."
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"/ for backward compatibility, fall back to Display box computation
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^ self computeBoundingBox
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!
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initialize
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^ self
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! !
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!DisplayObject methodsFor:'queries'!
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canBeMoved
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"return true, if the receiver can be moved around"
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^ true
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!
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containsPoint: aPoint
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^ frame containsPoint: aPoint
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!
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handlesKeyboardInput
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"return true, if the receiver handles keyboard input"
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^ false
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!
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hasFixedSize
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"return true, if the receiver has fixed size i.e. cannot be
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resized
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- by default, we do not allow resizing"
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^ true
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!
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intersects:aRectangle
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"object must decide, if its intersecting a rectangle"
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^ frame intersects:aRectangle
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!
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isContainedIn:aRectangle
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"object must decide, if its within a rectangle"
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^ aRectangle contains:frame
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!
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isHitBy:aPoint
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"object must decide, if hit by a click at aPoint"
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^ self isHitBy:aPoint withDelta:0
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!
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isHitBy:aPoint withDelta:delta
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"object must decide, if hit by a click at aPoint;
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usually this method is redefined in subclasses for a more complete
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check (i.e. if objects boundary is not rectangular)"
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|org left right top bott px py d2|
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frame isNil ifTrue:[
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frame := self computeBoundingBox
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].
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(delta == 0) ifTrue:[
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^ frame containsPoint:aPoint
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].
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21
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"
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332 |
its quicker to not create a new rectangle for the test
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34
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(which is not obvious for simple lines, but complex polygons
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or grouped objects may call this for many of its components)
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"
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org := frame origin.
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left := org x - delta.
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px := aPoint x.
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(px < left) ifTrue:[^ false]. "aPoint is to the left of my left edge"
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0
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d2 := delta * 2.
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right := left + frame width + d2.
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(px > right) ifTrue:[^ false]. "aPoint is to the right of my right edge"
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0
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top := org y - delta.
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py := aPoint y.
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(py < top) ifTrue:[^ false]. "aPoint is above my top edge"
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bott := top + frame height + d2.
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(py > bott) ifTrue:[^ false]. "aPoint is below my bottom edge"
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^ true
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!
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355 |
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122
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isOpaque
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357 |
"return true, if the object fully covers its frame (i.e. is rectangular
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358 |
and has no 'holes'. Since we dont know, return false here"
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122
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^ false
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! !
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362 |
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122
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363 |
!DisplayObject methodsFor:'users actions'!
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0
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364 |
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122
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keyInput:akey
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^ self
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!
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122
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moveTo:aPoint
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370 |
"object must move to new origin
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371 |
- default is to stay; ought to be redefined in subclass"
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372 |
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122
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^ self
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374 |
! !
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0
|
375 |
|