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341
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Object subclass:#DragAndDropManager
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instanceVariableNames:'dragView motionAction releaseAction initialPoint previousPoint
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rememberedDelegate'
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classVariableNames:''
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poolDictionaries:''
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category:'Interface-Support'
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!
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View subclass:#DragAndDropTestClass
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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privateIn:DragAndDropManager
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!
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!DragAndDropManager class methodsFor:'documentation'!
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history
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"Created: 26.10.1996 / 15:02:00 / cg"
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"Modified: 26.10.1996 / 15:21:42 / cg"
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! !
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!DragAndDropManager privateMethodsFor:'dragging - lines'!
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doLineDragX:x y:y
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previousPoint notNil ifTrue:[
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self invertLineFrom:initialPoint to:previousPoint
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].
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previousPoint := x @ y.
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self invertLineFrom:initialPoint to:previousPoint
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"Modified: 26.10.1996 / 15:16:59 / cg"
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!
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endLineDragX:x y:y
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previousPoint notNil ifTrue:[
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self invertLineFrom:initialPoint to:previousPoint
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].
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previousPoint := nil.
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self uncatchEvents
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"Created: 26.10.1996 / 15:17:20 / cg"
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"Modified: 26.10.1996 / 15:22:41 / cg"
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!
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invertLineFrom:ip1 to:ip2
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|t offs p1 p2 rootView|
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rootView := dragView device rootView.
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p1 := ip1.
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p2 := ip2.
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"
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get device coordinates
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"
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(t := dragView transformation) notNil ifTrue:[
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p1 := t applyTo:p1.
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p2 := t applyTo:p2.
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].
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"
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translate to screen
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"
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offs := dragView device
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translatePoint:0@0
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from:(dragView id) to:(rootView id).
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p1 := p1 + offs.
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p2 := p2 + offs.
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rootView clippedByChildren:false.
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rootView xoring:[
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rootView lineWidth:0.
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rootView displayLineFrom:p1 to:p2.
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rootView flush
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].
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"Created: 26.10.1996 / 15:15:26 / cg"
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"Modified: 26.10.1996 / 15:27:09 / cg"
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! !
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!DragAndDropManager methodsFor:'dragging - lines'!
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setupForLineDragFrom:aView at:p
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self catchEventsFrom:aView.
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motionAction := #doLineDragX:y:.
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releaseAction := #endLineDragX:y:.
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initialPoint := p.
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previousPoint := nil
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"Modified: 26.10.1996 / 15:09:26 / cg"
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"Created: 26.10.1996 / 15:16:13 / cg"
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! !
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!DragAndDropManager methodsFor:'event catching'!
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buttonMotion:button x:x y:y view:aView
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self perform:motionAction with:x with:y
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"Created: 26.10.1996 / 15:09:00 / cg"
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!
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buttonRelease:button x:x y:y view:aView
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self perform:releaseAction with:x with:y
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"Created: 26.10.1996 / 15:09:14 / cg"
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!
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handlesButtonMotion:button inView:aView
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"query from event processor: am I interested in button-events ?
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yes I am (to activate the clicked-on field)."
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^ aView == dragView
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"Created: 26.10.1996 / 15:05:36 / cg"
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!
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handlesButtonRelease:button inView:aView
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"query from event processor: am I interested in button-events ?
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yes I am (to activate the clicked-on field)."
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^ aView == dragView
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"Created: 26.10.1996 / 15:05:48 / cg"
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! !
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!DragAndDropManager methodsFor:'private'!
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catchEventsFrom:aView
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dragView := aView.
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rememberedDelegate := aView delegate.
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aView delegate:self
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"Created: 26.10.1996 / 15:03:12 / cg"
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"Modified: 26.10.1996 / 15:21:57 / cg"
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!
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uncatchEvents
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dragView delegate:rememberedDelegate.
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dragView := nil.
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"Created: 26.10.1996 / 15:22:29 / cg"
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! !
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!DragAndDropManager::DragAndDropTestClass methodsFor:'events'!
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buttonPress:button x:x y:y
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DragAndDropManager new
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setupForLineDragFrom:self at:(x@y)
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"
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self new open
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"
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! !
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!DragAndDropManager class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/DragAndDropManager.st,v 1.1 1996-10-26 14:40:21 cg Exp $'
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! !
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