"
 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.
"

'From Smalltalk/X, Version:2.10.5 on 15-apr-1995 at 12:14:46 pm'!

Layout subclass:#LayoutOrigin
	 instanceVariableNames:'leftFraction topFraction leftOffset
		topOffset'
	 classVariableNames:''
	 poolDictionaries:''
	 category:'Graphics-Geometry'
!

!LayoutOrigin 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.
"
!

version
"
$Header: /cvs/stx/stx/libview2/LayoutOrigin.st,v 1.3 1995-08-10 18:44:01 claus Exp $
"
! !

!LayoutOrigin class methodsFor:'instance creation'!

fractionalFromPoint:aPoint
    ^ (self new) leftFraction:aPoint x topFraction:aPoint y
!

offsetFromPoint:aPoint
    ^ self new leftOffset:aPoint x topOffset:aPoint y
!

fromPoint:aPoint
    "return a new LayoutOrigin from  aPoint.
     If the coordinates are between 0 and 1, take
     them as fractional parts (relative to superview).
     Otherwise, treat them as absolute offsets."

    |x y layout|

    x := aPoint x.
    y := aPoint y.
    layout := self new.
    ((x between:0 and:1)
    and:[y between:0 and:1]) ifTrue:[
	layout leftFraction:x topFraction:y
    ] ifFalse:[
	layout leftOffset:x topOffset:y
    ].
    ^ layout
! !

!LayoutOrigin methodsFor:'printing & storing'!

displayString
    ^ (self class name) , '(' 
	, 'l: ' , leftFraction displayString
	, '+' , leftOffset displayString
	, ' t: ' , topFraction displayString
	, '+' , topOffset displayString
	, ')'
! !

!LayoutOrigin methodsFor:'accessing'!

leftFraction:something
    "set leftFraction"

    leftFraction := something.
!

leftFraction
    "return leftFraction"

    ^ leftFraction
!

leftOffset:something
    "set leftOffset"

    leftOffset := something.
!

leftOffset
    "return leftOffset"

    ^ leftOffset
!

leftFraction:something offset:o
    "set leftFraction and offset"

    leftFraction := something.
    leftOffset := o
!

topFraction:something
    "set topFraction"

    topFraction := something.
!

topFraction
    "return topFraction"

    ^ topFraction
!

topOffset:something
    "set topOffset"

    topOffset := something.
!

topOffset
    "return topOffset"

    ^ topOffset
!

topFraction:something offset:o
    "set topFraction and offset"

    topFraction := something.
    topOffset := o
!

leftFraction:newLeft topFraction:newTop 
    "set leftFraction and topFraction"

    leftFraction := newLeft.
    topFraction := newTop.
!

leftOffset:newLeft topOffset:newTop 
    "set leftOffset and topOffset"

    leftOffset := newLeft.
    topOffset := newTop.
! !

!LayoutOrigin methodsFor:'queries'!

rectangleRelativeTo:superRectangle preferred:prefRect
    |x y|

    leftOffset isNil ifTrue:[
	x := 0
    ] ifFalse:[
	x := leftOffset
    ].
    topOffset isNil ifTrue:[
	y := 0
    ] ifFalse:[
	y := topOffset
    ].
    leftFraction notNil ifTrue:[
	x := x + (superRectangle width * leftFraction)
    ].
    topFraction notNil ifTrue:[
	y := y + (superRectangle height * topFraction)
    ].
    ^ Rectangle origin:x@y extent:prefRect extent

    "
     |superRect lO|

     superRect := 0@0 corner:100@100.
     lO := (LayoutOrigin new).
     lO leftFraction:0.5;
	topFraction:0.5.
     lO rectangleRelativeTo:superRect preferred:(0@0 corner:30@30)
    "
!

origin
    ^ leftFraction asFloat @ topFraction asFloat
! !

!LayoutOrigin methodsFor:'initialization'!

initialize
    leftOffset := topOffset := 0.
    leftFraction := topFraction := 0.
! !