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"
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COPYRIGHT (c) 1989 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 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libwidg/HorizontalPanelView.st,v 1.5 1994-10-10 03:01:39 claus Exp $
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'!
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!HorizontalPanelView class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1989 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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!
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version
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"
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$Header: /cvs/stx/stx/libwidg/HorizontalPanelView.st,v 1.5 1994-10-10 03:01:39 claus Exp $
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"
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!
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documentation
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"
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a View which arranges its child-views in a horizontal row.
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All real work is done in PanelView - only the layout computation is
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redefined here.
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example: default layout (centered)
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|v p b1 b2 b3|
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v := StandardSystemView new.
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p := HorizontalPanelView in:v.
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p origin:(0.0 @ 0.0) corner:(1.0 @ 1.0).
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b1 := Button label:'button1' in:p.
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b2 := Button label:'button2' in:p.
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b3 := Button label:'button3' in:p.
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v extent:300 @ 100.
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v open
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example: left-layout
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|v p b1 b2 b3|
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v := StandardSystemView new.
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p := HorizontalPanelView in:v.
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p layout:#left.
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p origin:(0.0 @ 0.0) corner:(1.0 @ 1.0).
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b1 := Button label:'button1' in:p.
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b2 := Button label:'button2' in:p.
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b3 := Button label:'button3' in:p.
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v extent:300 @ 100.
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v open
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example: right-layout
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|v p b1 b2 b3|
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v := StandardSystemView new.
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p := HorizontalPanelView in:v.
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p layout:#right.
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p origin:(0.0 @ 0.0) corner:(1.0 @ 1.0).
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b1 := Button label:'button1' in:p.
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b2 := Button label:'button2' in:p.
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b3 := Button label:'button3' in:p.
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v extent:300 @ 100.
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v open
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example: spread-layout
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|v p b1 b2 b3|
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v := StandardSystemView new.
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p := HorizontalPanelView in:v.
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p layout:#spread.
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p origin:(0.0 @ 0.0) corner:(1.0 @ 1.0).
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b1 := Button label:'button1' in:p.
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b2 := Button label:'button2' in:p.
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b3 := Button label:'button3' in:p.
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v extent:300 @ 100.
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v open
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"
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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 maxWidth|
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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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maxWidth := 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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maxWidth := maxWidth max:(child widthIncludingBorder).
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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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layout == #fit ifTrue:[
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sumOfWidths := maxWidth * subViews size.
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borderWidth ~~ 0 ifTrue:[
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sumOfWidths := sumOfWidths + (verticalSpace * 2).
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]
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] ifFalse:[
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sumOfWidths := sumOfWidths + ((subViews size - 1) * horizontalSpace).
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].
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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 sumOfWidths numChilds l wEach|
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subViews isNil ifTrue:[^ self].
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space := horizontalSpace.
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numChilds := subViews size.
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layout == #fit ifTrue:[
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"
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adjust childs extents and set origins.
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Be careful to avoid accumulation of rounding errors
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"
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wEach := (width - (margin * 2) - (numChilds + 1 * space) + borderWidth) / numChilds.
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xpos := space + margin - borderWidth.
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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 rounded @ ypos)
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corner:(xpos + wEach - (child borderWidth)) rounded
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@ (ypos + child height).
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xpos := xpos + wEach + space
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].
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^ self
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].
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"compute net width needed"
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sumOfWidths := subViews inject:0 into:[:sumSoFar :child | sumSoFar + child widthIncludingBorder].
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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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"
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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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"
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(sumOfWidths >= (width - (margin * 2))) 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 - (space * numChilds) - sumOfWidths.
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"
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borderWidth == 0 ifTrue:[
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xpos := xpos + space
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].
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"
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xpos < 0 ifTrue:[
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space := space min:(width - sumOfWidths) // (numChilds + 1).
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xpos := width - (space * numChilds) - sumOfWidths.
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]
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] ifFalse:[
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(l == #spread) ifTrue:[
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space := (width - sumOfWidths) // (numChilds + 1).
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xpos := space.
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(space == 0) ifTrue:[
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xpos := (width - sumOfWidths) // 2
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]
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] ifFalse:[
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(l == #center) ifTrue:[
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xpos := (width - (sumOfWidths
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+ ((numChilds - 1) * space))) // 2.
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xpos < 0 ifTrue:[
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space := (width - sumOfWidths) // (numChilds + 1).
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xpos := (width - (sumOfWidths
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+ ((numChilds - 1) * space))) // 2.
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]
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] ifFalse:[
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"left"
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space := space min:(width - sumOfWidths) // (numChilds + 1).
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xpos := space.
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"
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borderWidth == 0 ifTrue:[
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xpos := 0
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].
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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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