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"{ Encoding: utf8 }"
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"
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COPYRIGHT (c) 1995 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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2137
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"{ Package: 'stx:libview2' }"
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"{ NameSpace: Smalltalk }"
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Object subclass:#Layout
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Graphics-Geometry'
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!
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!Layout class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1995 by Claus Gittinger
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93
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All Rights Reserved
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88
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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 is an abstract superclass for geometry controlling objects.
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While old smalltalks used relative origin/extent/corner and absolute
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origin/corner/extents, these mechanisms are now being removed from the
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view itself into geometry controlling objects, which are given a superview's
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size and are to return a component's size upon request.
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This allows more flexible geometry management, since any algorithm can
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be implemented (if the existing ones are not sufficient, add you own subclass
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and install it as layout-object in your view).
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Notice:
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this class was implemented using protocol information
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from alpha testers - it may not be complete or compatible to
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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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[author:]
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Claus Gittinger
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229
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[see also:]
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View
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LayoutOrigin LayoutFrame AlignmentOrigin
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"
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! !
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!Layout class methodsFor:'instance creation'!
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new
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"return a new initialized instance"
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^ self basicNew initialize
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"Modified: 27.4.1996 / 14:47:08 / cg"
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! !
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!Layout class methodsFor:'queries'!
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isAbstract
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"Return if this class is an abstract class.
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True is returned here for myself only; false for subclasses.
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Abstract subclasses must redefine this again."
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^ self == Layout.
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! !
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!Layout methodsFor:'computing'!
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rectangleRelativeTo:superRectangle preferred:prefRectHolder
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"compute the rectangle represented by the receiver,
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given the superView's rectangle and the view's preferredExtent.
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Must be implemented by concrete subclasses."
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^ self subclassResponsibility
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"Modified: / 27-05-1998 / 10:19:21 / cg"
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"Modified (comment): / 17-07-2019 / 10:02:45 / Claus Gittinger"
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! !
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!Layout methodsFor:'converting'!
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asLayout
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"return the receiver"
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^ self
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"Created: 29.5.1996 / 15:12:13 / cg"
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! !
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!Layout methodsFor:'initialization'!
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initialize
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"setup the instance - to be redefined by concrete subclasses"
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^ self subclassResponsibility
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"Modified: 27.4.1996 / 14:46:56 / cg"
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! !
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!Layout methodsFor:'queries'!
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isAlignmentOrigin
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"return true, if this is an alignmentOrigin"
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^ false
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!
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isLayout
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"return true, if the receiver is a layout object.
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Always return true here."
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415
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^ true
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"Modified: 27.4.1996 / 14:45:27 / cg"
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!
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isLayoutFrame
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"return true, if this is a layoutFrame"
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^ false
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!
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isLayoutOrigin
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"return true, if this is a layoutOrigin"
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^ false
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! !
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!Layout class methodsFor:'documentation'!
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version
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^ '$Header$'
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! !
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