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COPYRIGHT (c) 1989-92 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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PanelView subclass:#HorizontalPanelView
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Views-Layout'
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!
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HorizontalPanelView comment:'
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COPYRIGHT (c) 1989-92 by Claus Gittinger
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All Rights Reserved
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a View for childViews oriented horizontal
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all real work is done in PanelView - just redefine layout
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%W% %E%
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written spring/summer 89 by claus
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'!
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!HorizontalPanelView methodsFor:'queries'!
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preferedExtent
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"return a good extent, one that makes subviews fit"
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|sumOfWidths maxHeight|
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subViews isNil ifTrue:[^ horizontalSpace @ verticalSpace].
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"compute net height needed"
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sumOfWidths := 0.
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maxHeight := 0.
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subViews do:[:child |
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sumOfWidths := sumOfWidths + child widthIncludingBorder.
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maxHeight := maxHeight max:(child heightIncludingBorder)
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].
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borderWidth ~~ 0 ifTrue:[
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sumOfWidths := sumOfWidths + (horizontalSpace * 2).
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maxHeight := maxHeight + (verticalSpace * 2).
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].
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sumOfWidths := sumOfWidths + ((subViews size - 1) * horizontalSpace).
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^ sumOfWidths @ maxHeight
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! !
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!HorizontalPanelView methodsFor:'layout'!
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setChildPositions
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"(re)compute position of every child whenever childs are added or
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my size has changed"
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|xpos ypos space sumOfChildWidths numChilds l|
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subViews isNil ifTrue:[^ self].
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space := horizontalSpace.
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"compute net width needed"
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sumOfChildWidths := 0.
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numChilds := subViews size.
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subViews do:[:child |
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sumOfChildWidths := sumOfChildWidths + child widthIncludingBorder.
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].
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l := layout.
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((l == #center) and:[numChilds == 1]) ifTrue:[
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l := #spread
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].
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"compute position of leftmost subview and space between them;
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if they do hardly fit, leave no space between them "
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(sumOfChildWidths >= width) ifTrue:[
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xpos := 0.
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space := 0
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] ifFalse: [
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(l == #right) ifTrue:[
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xpos := width - (horizontalSpace * numChilds)
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- sumOfChildWidths.
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borderWidth == 0 ifTrue:[
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xpos := xpos + horizontalSpace
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].
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] ifFalse:[
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(l == #spread) ifTrue:[
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space := (width - sumOfChildWidths) // (numChilds + 1).
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xpos := space.
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(space == 0) ifTrue:[
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xpos := (width - sumOfChildWidths) // 2
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]
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] ifFalse:[
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(l == #center) ifTrue:[
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xpos := (width - (sumOfChildWidths
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+ ((numChilds - 1) * space))) // 2
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] ifFalse:[
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borderWidth == 0 ifTrue:[
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xpos := 0
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] ifFalse:[
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xpos := horizontalSpace
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]
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]
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]
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]
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].
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"now set positions"
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subViews do:[:child |
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ypos := (height - child heightIncludingBorder) // 2.
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(ypos < 0) ifTrue:[ypos := 0].
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child origin:(xpos @ ypos).
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xpos := xpos + (child widthIncludingBorder) + space
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]
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! !
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