"

 COPYRIGHT (c) 1995 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

Object subclass:#Layout

	 instanceVariableNames:''

	 classVariableNames:''

	 poolDictionaries:''

	 category:'Graphics-Geometry'

!

!Layout class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1995 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    This is an abstract superclass for geometry controlling objects.

    While old smalltalks used relative origin/extent/corner and absolute

    origin/corner/extents, these mechanisms are now being removed from the

    view itself into geometry controlling objects, which are given a superviews

    size and are to return a components size upon request.

    This allows more flexible geometry management, since any algorithm can

    be implemented (if the existing ones are not sufficient, add you own subclass

    and instal it as layout-object in your view).

    See more info & examples in concrete subclasses:

	LayoutOrigin LayoutFrame AlignmentOrigin

    Notice: this class was implemented using protocol information

    from alpha testers - it may not be complete or compatible to

    the corresponding ST-80 class. If you encounter any incompatibilities,

    please forward a note to the ST/X team.

!

version

"

"

! !

!Layout class methodsFor:'instance creation'!

new

    ^ self basicNew initialize

! !

!Layout methodsFor:'queries'!

rectangleRelativeTo:superRectangle preferred:prefRect

    ^ self subclassResponsibility

!

isLayout

    ^ true

! !

!Layout methodsFor:'initialization'!

initialize

    ^ self subclassResponsibility

! !