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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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LayoutOrigin subclass:#AlignmentOrigin
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instanceVariableNames:'leftAlignmentFraction topAlignmentFraction'
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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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!AlignmentOrigin 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 class is provided to make porting of existing ST-80 applications
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easier. Instances can be used to control the geometry of a subview, within
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its superview. Like a LayoutOrigin, it controls the components origin
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via a relative part plus offset. However, in contrast to LayoutOrigin
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(in which the top-left corner is specified by fraction+offset, here any
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reference point within the component is positioned.
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The reference point itself is specified as fraction of the components size.
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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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[See also:]
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LayoutOrigin LayoutFrame Layout
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View
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"
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!
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examples
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"
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Although the examples below use a button as component,
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they work of course with any type of subview ....
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using a LayoutOrigin, to control the top-left origins position of
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a component (i.e. origin at:0.5@0.5):
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[exBegin]
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|top button|
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top := StandardSystemView new.
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top extent:300@300.
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button := Button label:'component'.
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top add:button in:(LayoutOrigin new
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leftFraction:0.5;
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topFraction:0.5).
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top open
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[exEnd]
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using an AlignmentOrigin, to control the centers position of
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a component (i.e. center of component at:0.5@0.5):
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[exBegin]
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|top button|
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top := StandardSystemView new.
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top extent:300@300.
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button := Button label:'component'.
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top add:button in:(AlignmentOrigin new
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leftFraction:0.5;
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topFraction:0.5;
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leftAlignmentFraction:0.5;
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topAlignmentFraction:0.5).
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top open
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[exEnd]
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using an AlignmentOrigin, to control the bottom-right position of
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a component (i.e. bottom-right of component at:0.5@0.5):
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[exBegin]
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|top button|
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top := StandardSystemView new.
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top extent:300@300.
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button := Button label:'component'.
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top add:button in:(AlignmentOrigin new
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leftFraction:0.5;
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topFraction:0.5;
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leftAlignmentFraction:1.0;
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topAlignmentFraction:1.0).
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top open
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[exEnd]
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four buttons around relative 0.75@0.75:
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[exBegin]
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|top button|
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top := StandardSystemView new.
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top extent:300@300.
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button := Button label:'button1'.
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top add:button in:(AlignmentOrigin new
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leftFraction:0.75;
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topFraction:0.75;
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leftAlignmentFraction:1.0;
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topAlignmentFraction:1.0).
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button := Button label:'button2'.
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top add:button in:(AlignmentOrigin new
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leftFraction:0.75;
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topFraction:0.75;
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leftAlignmentFraction:0.0;
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topAlignmentFraction:1.0).
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button := Button label:'button3'.
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top add:button in:(AlignmentOrigin new
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leftFraction:0.75;
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topFraction:0.75;
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leftAlignmentFraction:1.0;
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topAlignmentFraction:0.0).
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button := Button label:'button4'.
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top add:button in:(AlignmentOrigin new
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leftFraction:0.75;
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topFraction:0.75;
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leftAlignmentFraction:0.0;
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topAlignmentFraction:0.0).
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top open
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[exEnd]
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"
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! !
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!AlignmentOrigin methodsFor:'accessing'!
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leftAlignmentFraction
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"return leftAlignmentFraction"
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^ leftAlignmentFraction
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!
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leftAlignmentFraction:something
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"set leftAlignmentFraction"
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leftAlignmentFraction := something.
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!
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topAlignmentFraction
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"return topAlignmentFraction"
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^ topFraction
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!
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topAlignmentFraction:something
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"set topAlignmentFraction"
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topAlignmentFraction := something.
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! !
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!AlignmentOrigin methodsFor:'converting'!
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fromLiteralArrayEncoding:encoding
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"read my values from an encoding.
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The encoding is supposed to be of the form:
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(AlignmentOrigin orgOffsX relOrgX orgOffsY relOrgY leftAlignFract topAlignFract)"
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leftOffset := encoding at:2.
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leftFraction := encoding at:3.
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topOffset := encoding at:4.
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topFraction := encoding at:5.
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leftAlignmentFraction := encoding at:6.
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topAlignmentFraction := encoding at:7.
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"
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AlignmentOrigin new fromLiteralArrayEncoding:#(#AlignmentOrigin 70 0 2 0 0.5 0.25)
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"
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"Modified: 1.9.1995 / 02:23:53 / claus"
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!
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literalArrayEncoding
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"encode myself as an array, from which a copy of the receiver
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can be reconstructed with #decodeAsLiteralArray.
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The encoding is:
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(#AlignmentOrigin orgOffsX relOrgX orgOffsY relOrgY leftAlignFract topAlignFract)"
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^ super literalArrayEncoding
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, (Array
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with:leftAlignmentFraction
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with:topAlignmentFraction)
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"Modified: 1.9.1995 / 02:43:35 / claus"
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"Modified: 22.4.1996 / 12:59:56 / cg"
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! !
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!AlignmentOrigin methodsFor:'initialization'!
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initialize
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super initialize.
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leftAlignmentFraction := topAlignmentFraction := 0.
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! !
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!AlignmentOrigin methodsFor:'printing & storing'!
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displayString
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^ 'LayoutOrigin('
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, 'l: ' , leftFraction displayString
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, '+' , leftOffset displayString
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, ' t: ' , topFraction displayString
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, '+' , topOffset displayString
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, ' a: ' , leftAlignmentFraction displayString
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, '@' , topAlignmentFraction displayString
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, ')'
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! !
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!AlignmentOrigin methodsFor:'queries'!
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rectangleRelativeTo:superRectangle preferred:prefRect
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"compute the rectangle represented by the receiver,
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given the superViews rectangle and the views preferredExtent."
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|x y|
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leftOffset isNil ifTrue:[
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x := 0
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] ifFalse:[
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x := leftOffset
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].
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topOffset isNil ifTrue:[
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y := 0
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] ifFalse:[
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y := topOffset
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].
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leftFraction notNil ifTrue:[
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x := x + (superRectangle width * leftFraction)
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].
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topFraction notNil ifTrue:[
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y := y + (superRectangle height * topFraction)
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].
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leftAlignmentFraction ~~ 0 ifTrue:[
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x := x - (prefRect width * leftAlignmentFraction)
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].
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topAlignmentFraction ~~ 0 ifTrue:[
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y := y - (prefRect height * topAlignmentFraction)
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].
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^ Rectangle left:x top:y extent:prefRect extent
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"
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|superRect aO|
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superRect := 0@0 corner:100@100.
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aO := (AlignmentOrigin new).
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aO leftFraction:0.5;
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topFraction:0.5;
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leftAlignmentFraction:0.5;
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topAlignmentFraction:0.5.
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aO rectangleRelativeTo:superRect preferred:(0@0 corner:30@30)
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"
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"Modified: 8.5.1996 / 20:57:09 / cg"
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! !
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!AlignmentOrigin class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/AlignmentOrigin.st,v 1.15 1996-05-08 19:54:36 cg Exp $'
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! !
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