author | Claus Gittinger <cg@exept.de> |
Fri, 04 Apr 2003 19:07:54 +0200 | |
changeset 1737 | a1ed08195ee7 |
parent 1732 | d31fef80f6e5 |
child 1824 | 518e1e861f7c |
permissions | -rw-r--r-- |
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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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"{ Package: 'stx:libview2' }" |
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Object subclass:#DropContext |
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instanceVariableNames:'dropObjects rootPoint dropSource sourceWidget dropTarget |
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targetWidget targetId hasDropped dragHandler manager dropInfo' |
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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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dragHandler |
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^ dragHandler |
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! |
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dragHandler:aHandler |
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dragHandler := aHandler |
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! |
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dropInfo |
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"a hook for additional info" |
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dropInfo isNil ifTrue:[ |
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dropInfo := IdentityDictionary new |
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]. |
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^ dropInfo |
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! |
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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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manager:something |
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manager := something. |
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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 rootWindowId) 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 |
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feedBackSelector -> dropFeedBackSelector
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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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hasDropped ifTrue:[ "/ could have been cleared in drop-code |
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feedBackSelector -> dropFeedBackSelector
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dropSource dropFeedBackFrom:self |
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] |
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]. |
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passiveAction:aBlock |
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manager passiveAction:aBlock |
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! |
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saveDraw:aBlock |
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"evaluate aBlock with the drag temporarily being undrawn |
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(i.e. restore original picture, evaluate the block, and draw dragged objects again). |
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Return blocks value." |
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^ manager saveDraw:aBlock |
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! ! |
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!DropContext methodsFor:'change & update'! |
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contentsWillChange |
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"called by the dropTarget-widget if the contents will change during a |
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dragAndDrop operation |
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" |
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dragHandler notNil ifTrue:[ |
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dragHandler dropTargetWillChange |
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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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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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clearHasDroppedFlagToSuppressFeedBack |
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"can be used from within a targets drop code, |
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to signal that no feedBack should be send to the |
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feedBackSelector -> dropFeedBackSelector
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dropSource (because the drop did not happen)" |
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feedBackSelector -> dropFeedBackSelector
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|
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hasDropped := false |
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! |
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feedBackSelector -> dropFeedBackSelector
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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 1.7 2003-03-30 13:03:51 cg Exp $' |
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! ! |