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"{ Package: 'stx:libwidg2' }"
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Object subclass:#HierarchicalDropTargetController
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instanceVariableNames:'expandBlock highlightMode receiver dropOverLine dropSelector
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canDropSelector canExpandSelector'
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classVariableNames:''
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poolDictionaries:''
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category:'Interface-DragAndDrop'
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!
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!HierarchicalDropTargetController class methodsFor:'instance creation'!
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receiver:aReceiver argument:anArgument dropSelector:aDropSelector canDropSelector:aCanDropSelector
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^ self
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receiver:aReceiver
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argument:anArgument
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dropSelector:aDropSelector
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canDropSelector:aCanDropSelector
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canExpandSelector:nil
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!
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receiver:aReceiver argument:anArgument dropSelector:aDropSelector canDropSelector:aCanDropSelector canExpandSelector: aCanExpandSelector
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|target|
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target := self new.
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^ target
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receiver:aReceiver
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argument:anArgument
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dropSelector:aDropSelector
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canDropSelector:aCanDropSelector
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canExpandSelector:aCanExpandSelector
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!
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receiver:aReceiver dropSelector:aDropSelector canDropSelector:aCanDropSelector
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^ self
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receiver:aReceiver
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argument:nil
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dropSelector:aDropSelector
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canDropSelector:aCanDropSelector
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canExpandSelector:nil
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!
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receiver:aReceiver dropSelector:aDropSelector canDropSelector:aCanDropSelector canExpandSelector:aCanExpandSelector
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^ self
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receiver:aReceiver
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argument:nil
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dropSelector:aDropSelector
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canDropSelector:aCanDropSelector
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canExpandSelector:aCanExpandSelector
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! !
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!HierarchicalDropTargetController class methodsFor:'constants'!
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delayMilliSecondsBeforeExpand
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^ 1000
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! !
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!HierarchicalDropTargetController methodsFor:'drop actions'!
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canDrop:aDropContext
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"return true, if the DropContext can be dropped into the list of items"
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dropOverLine isNil ifTrue:[ ^ false ]. "/ never setup by dropEnter:
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canDropSelector isNil ifTrue:[ ^ false ].
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^ self performSelector:canDropSelector dropContext:aDropContext lineNr:dropOverLine.
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!
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drop:aDropContext
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"drop the dropContext into the hierachical list of items
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"
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|lnNr|
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(self canDrop:aDropContext) ifFalse:[
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self dropLeave:aDropContext.
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^ false.
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].
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lnNr := dropOverLine.
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lnNr isNil ifTrue:[^ false ]. "/ never setup by dropEnter:
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self dropLeave:aDropContext.
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dropSelector isNil ifTrue:[ ^ false ].
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^ self performSelector:dropSelector dropContext:aDropContext lineNr:lnNr.
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!
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dropEnter:aDropContext
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"a drop operation enters my widget; set the highlightMode in the target widget"
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|widget|
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dropOverLine := 0.
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widget := aDropContext targetWidget.
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highlightMode := widget highlightMode.
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highlightMode notNil ifTrue:[
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aDropContext saveDraw:[
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widget highlightMode: #dropMode.
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widget windowGroup processExposeEvents.
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].
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].
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!
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dropLeave:aDropContext
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"the widget is leaved; restore drop indications drawn ...
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"
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self changeDropLineTo:nil in:aDropContext.
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!
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dropOver:aDropContext
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|target lineNr|
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dropOverLine isNil ifTrue:[^ self ]. "/ never setup by dropEnter:
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target := aDropContext targetWidget.
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lineNr := target yVisibleToLineNr:(aDropContext targetPoint y).
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lineNr isNil ifTrue:[ lineNr := 0. ].
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lineNr > target size ifTrue:[
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lineNr := 0.
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].
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self changeDropLineTo:lineNr in:aDropContext.
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! !
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!HierarchicalDropTargetController methodsFor:'instance creation'!
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receiver:aReceiver argument:anArgument dropSelector:aDropSelector canDropSelector:aCanDropSelector canExpandSelector:aCanExpandSelector
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|target|
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receiver := aReceiver.
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dropSelector := aDropSelector.
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canDropSelector := aCanDropSelector.
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canExpandSelector := aCanExpandSelector.
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target := DropTarget
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receiver:self
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argument:anArgument
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dropSelector:#drop:
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canDropSelector:#canDrop:.
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target enterSelector:#dropEnter:.
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target leaveSelector:#dropLeave:.
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target overSelector:#dropOver:.
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^ target
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! !
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!HierarchicalDropTargetController methodsFor:'private'!
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changeDropLineTo:aLineOrNil in:aDropContext
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|x0 y0 y1 view item bgColor fgColor processEvents|
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aLineOrNil == dropOverLine ifTrue:[ ^ self ]. "/ nothing changed
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view := aDropContext targetWidget.
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expandBlock notNil ifTrue:[
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Processor removeTimedBlock:expandBlock.
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].
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processEvents := (aLineOrNil isNil).
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aDropContext contentsWillChange.
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(aLineOrNil isNil and:[highlightMode notNil]) ifTrue:[
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"/ resore the selection mode
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view highlightMode: highlightMode.
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highlightMode := nil.
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processEvents := true.
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].
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(dropOverLine notNil and:[dropOverLine ~~ 0]) ifTrue:[
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"/ invalidate old line
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view invalidateLineAt:dropOverLine.
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processEvents := true.
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].
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processEvents ifTrue:[
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view windowGroup processExposeEvents.
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].
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dropOverLine := aLineOrNil.
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(dropOverLine isNil or:[dropOverLine == 0]) ifTrue:[
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^ self
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].
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item := view at:dropOverLine ifAbsent:nil.
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item isNil ifTrue:[ ^ self ].
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y0 := view yVisibleOfLine:dropOverLine.
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y1 := view yVisibleOfLine:(dropOverLine + 1).
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x0 := view xVisibleOfTextAtLevel:item level.
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bgColor := view hilightBackgroundColor.
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fgColor := view hilightForegroundColor.
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view paint: bgColor.
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view fillRectangle:(Rectangle left:(x0 - 2) top:y0 width:(item widthOn:view) + 4 height:(y1 - y0)).
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view paint:fgColor on:bgColor.
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item displayOn:view x:x0 y:y0 h:(y1 - y0).
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item isExpanded ifTrue:[ ^ self ].
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item canExpand ifFalse:[ ^ self ].
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canExpandSelector notNil ifTrue:[
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(self performSelector:canExpandSelector dropContext:aDropContext lineNr:dropOverLine) ifFalse:[
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^ self
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].
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].
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Processor
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addTimedBlock: [self expandForDrop:aDropContext at:aLineOrNil]
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afterMilliseconds:(self class delayMilliSecondsBeforeExpand).
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!
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expandForDrop:aDropContext at:aLnNr
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|item view|
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expandBlock := nil.
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aLnNr == dropOverLine ifFalse:[ ^ self].
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view := aDropContext targetWidget.
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item := view at:aLnNr ifAbsent:nil.
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item isNil ifTrue:[^ self].
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aDropContext saveDraw:[
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item expand.
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view windowGroup processExposeEvents.
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].
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!
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performSelector:aSelector dropContext:aDropContext lineNr:aLineNr
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"perform a selector with optional arguments
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"
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|numArgs|
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numArgs := aSelector numArgs.
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numArgs == 0 ifTrue:[ ^ receiver perform:aSelector ].
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numArgs == 1 ifTrue:[ ^ receiver perform:aSelector with:aDropContext ].
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^ receiver perform:aSelector with:aDropContext with:aLineNr
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! !
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!HierarchicalDropTargetController class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libwidg2/HierarchicalDropTargetController.st,v 1.2 2008-03-27 14:30:34 ab Exp $'
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! !
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