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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:#VerticalPanelView
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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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VerticalPanelView 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/VerticalPanelView.st,v 1.5 1994-10-10 03:03:18 claus Exp $
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'!
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!VerticalPanelView 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/VerticalPanelView.st,v 1.5 1994-10-10 03:03:18 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 vertical column.
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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 := VerticalPanelView 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:100 @ 300.
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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 := VerticalPanelView in:v.
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p layout:#top.
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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:100 @ 300.
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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 := VerticalPanelView in:v.
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p layout:#bottom.
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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:100 @ 300.
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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 := VerticalPanelView 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:100 @ 300.
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v open
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"
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! !
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!VerticalPanelView methodsFor:'queries'!
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preferedExtent
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"return a good extent, one that makes subviews fit"
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|sumOfHeights maxWidth maxHeight|
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subViews isNil ifTrue:[^ horizontalSpace @ verticalSpace].
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"compute net height needed"
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sumOfHeights := 0.
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maxWidth := 0.
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subViews do:[:child |
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sumOfHeights := sumOfHeights + child heightIncludingBorder.
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maxWidth := maxWidth max:(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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sumOfHeights := sumOfHeights + (horizontalSpace * 2).
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maxWidth := maxWidth + (horizontalSpace * 2).
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].
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sumOfHeights := sumOfHeights + ((subViews size - 1) * verticalSpace).
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^ maxWidth @ sumOfHeights
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! !
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!VerticalPanelView methodsFor:'layout'!
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setChildPositions
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"(re)compute position of every child"
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|xpos ypos space sumOfHeights numChilds l hEach|
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subViews isNil ifTrue:[^ self].
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space := verticalSpace.
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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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hEach := (height - (margin * 2) - (numChilds + 1 * space) + borderWidth) / numChilds.
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ypos := space + margin - borderWidth.
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subViews do:[:child |
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xpos := (width - child widthIncludingBorder) // 2.
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(xpos < 0) ifTrue:[xpos := 0].
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child origin:(xpos @ ypos rounded)
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corner:(xpos + (child width))
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@ (ypos + hEach - (child borderWidth)) rounded.
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ypos := ypos + hEach + "(child borderWidth * 2) +" space
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].
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^ self
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].
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"compute net height needed"
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sumOfHeights := subViews inject:0 into:[:sumSoFar :child | sumSoFar + child heightIncludingBorder].
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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 topmost subview and space between them;
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if they do hardly fit, leave no space between them "
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(sumOfHeights >= (height - (margin * 2))) ifTrue:[
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ypos := 0.
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space := 0
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] ifFalse:[
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(l == #bottom) ifTrue:[
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ypos := height - (space * numChilds) - sumOfHeights.
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"
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borderWidth == 0 ifTrue:[
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ypos := ypos + space
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].
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"
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ypos < 0 ifTrue:[
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space := space min:(height - sumOfHeights) // (numChilds + 1).
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ypos := height - (space * numChilds) - sumOfHeights.
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]
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] ifFalse: [
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(l == #spread) ifTrue:[
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space := (height - sumOfHeights) // (numChilds + 1).
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ypos := space.
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(space == 0) ifTrue:[
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ypos := (height - sumOfHeights) // 2
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]
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] ifFalse: [
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(l == #center) ifTrue:[
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ypos := (height - (sumOfHeights
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+ ((numChilds - 1) * space))) // 2.
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ypos < 0 ifTrue:[
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space := (height - sumOfHeights) // (numChilds + 1).
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ypos := (height - (sumOfHeights
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+ ((numChilds - 1) * space))) // 2.
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]
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] ifFalse:[
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"
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borderWidth == 0 ifTrue:[
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ypos := 0
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] ifFalse:[
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ypos := verticalSpace
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].
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"
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space := space min:(height - sumOfHeights) // (numChilds + 1).
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ypos := space.
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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:[:childView |
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xpos := (width - childView widthIncludingBorder) // 2.
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(xpos < 0) ifTrue:[ xpos := 0 ].
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childView origin:(xpos@ypos).
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ypos := ypos + (childView heightIncludingBorder) + space
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]
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! !
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