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"
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COPYRIGHT (c) 1998 by eXept Software AG / 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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Object subclass:#DropContext
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instanceVariableNames:'dropObjects rootPoint dropSource sourceWidget dropTarget
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targetWidget targetId hasDropped'
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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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!DropContext class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1998 by eXept Software AG / 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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documentation
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"
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instance, which keeps information about the current drag & drop operation.
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dropObjects <Collection> collection of dropObjects.
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rootPoint <Point> the current mouse position on the screen (root view).
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[see also:]
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DragAndDropManager
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DropObject
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DropSource
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DropTarget
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[author:]
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Claus Atzkern
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"
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! !
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!DropContext methodsFor:'accessing'!
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dropObjects
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"returns the collection of droppable objects
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"
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^ dropObjects ? #()
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!
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rootPoint
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"returns the absolute point on the screen (rootPoint)
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"
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^ rootPoint
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! !
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!DropContext methodsFor:'accessing source'!
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dropSource
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"returns the drop source or nil
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"
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^ dropSource
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!
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sourceWidget
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"returns the source widget the drag is started from
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"
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^ sourceWidget
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! !
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!DropContext methodsFor:'accessing target'!
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dropTarget
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"returns the drop target or nil
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"
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^ dropTarget
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!
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targetId
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"returns the id of the target widget
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"
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^ targetId
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!
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targetPoint
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"returns the relative point on the target widget
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"
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|trn pnt dev|
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dev := sourceWidget device.
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pnt := dev translatePoint:rootPoint from:(dev rootView id) to:targetId.
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targetWidget notNil ifTrue:[
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(trn := targetWidget transformation) notNil ifTrue:[
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^ trn applyInverseTo:pnt
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]
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].
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^ pnt
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!
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targetWidget
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"returns the widget assigned to the current dropTarget
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"
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^ targetWidget
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! !
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!DropContext methodsFor:'actions'!
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doDrop
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"evaluate the drop operation; set the feedBack
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"
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hasDropped := self canDrop.
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self isAlienView ifFalse:[
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hasDropped ifTrue:[
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dropTarget drop:self
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] ifFalse:[
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"/
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"/ called to restore the widget in
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"/ case that something has changed
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"/
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dropTarget notNil ifTrue:[
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dropTarget leave:self
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]
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]
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] ifTrue:[
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"/
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"/ not one of my views
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"/ external clipboard mechanism via display
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"/
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"/ ?? FEEDBACK ?? hasDropped ??
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"/
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sourceWidget device drop:dropObjects
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inWindowID:targetId
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position:(self targetPoint)
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rootPosition:rootPoint.
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].
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dropSource notNil ifTrue:[
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"/
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"/ feedBack to dropSource
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"/
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dropSource feedBack:self
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].
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! !
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!DropContext methodsFor:'drag & drop manager interface'!
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dropObjects:something
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"set the collection of droppable objects
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"
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something notNil ifTrue:[
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dropObjects := something isCollection ifTrue:[something]
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ifFalse:[Array with:something]
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]
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!
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dropSource:aDropSource
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"set the dropSource
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"
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dropSource := aDropSource.
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!
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dropTarget:aDropTargetOrNil
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"set a new drop target
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"
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dropTarget := aDropTargetOrNil.
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!
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rootPoint:something
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"set the absolute point on the screen (rootPoint); called by the drag
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and drop manager
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"
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rootPoint := something.
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!
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sourceWidget:aView
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"set the source widget the drag is started from
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"
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sourceWidget := aView.
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!
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targetWidget:aViewOrNil id:anId
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"set a new drop widget
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"
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targetWidget := aViewOrNil.
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targetId := anId.
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! !
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!DropContext methodsFor:'queries'!
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canDrop
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"returns true if current dropTarget can drop draggable objects
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"
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^ dropTarget notNil ifTrue:[dropTarget canDrop:self] ifFalse:[false]
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!
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hasDropped
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^ hasDropped ? false
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!
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isAlienView
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"returns true if current dropTarget is not a ST/X view
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"
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^ targetWidget isNil
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!
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isRootView
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"returns true if the current target widget is the root view (screen)
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"
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^ targetWidget notNil ifTrue:[targetWidget isRootView]
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ifFalse:[false]
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! !
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!DropContext class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/DropContext.st,v 1.1 1998-03-30 12:00:14 ca Exp $'
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! !
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