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"
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COPYRIGHT (c) 1995 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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Controller subclass:#VariablePanelController
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instanceVariableNames:'movedHandle prevPos startPos isHorizontal'
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classVariableNames:''
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poolDictionaries:''
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126
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category:'Interface-Support-Controllers'
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104
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!
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!VariablePanelController class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1995 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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150
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documentation
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"
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An abstract class for variablePanel controllers;
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normally, not used directly by applications, these are created automatically
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whenever a variablePanel is created.
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Instances are responsible for tracking the mouse pointer and resize the
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views (a panel) subviews as appropriate.
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"
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!
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version
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^ '$Header: /cvs/stx/stx/libwidg/VariablePanelController.st,v 1.7 1995-11-23 10:41:07 cg Exp $'
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! !
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!VariablePanelController methodsFor:'event handling'!
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buttonMotion:state x:bx y:by
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"mouse-button was moved while pressed;
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clear prev handleBar and draw handle bar at new position"
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|pos limitMin limitMax subViews barHeight
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oldHx oldHy newHx newHy|
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movedHandle isNil ifTrue: [^ self]. "should not happen"
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"speedup - if there is already another movement,
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ignore thisone ... "
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view buttonMotionEventPending ifTrue:[^ self].
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subViews := view subViews.
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barHeight := view barHeight.
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isHorizontal ifTrue:[
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pos := bx - startPos.
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"
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the two lines below will not allow resizing down to zero
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(so that some is always visible)
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"
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"/ limitMin := barHeight // 2.
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"/ limitMax := view width - barHeight.
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"
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these allow resizing to zero - which is better ?
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"
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limitMin := 0.
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limitMax := view innerWidth.
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movedHandle > 1 ifTrue:[
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limitMin := (subViews at:movedHandle) origin x + (barHeight // 2)
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].
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movedHandle < (subViews size - 1) ifTrue:[
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limitMax := (subViews at:(movedHandle + 2)) origin x - barHeight
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].
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] ifFalse:[
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pos := by - startPos.
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"
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the two lines below will not allow resizing down to zero
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(so that some is always visible)
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"
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"/ limitMin := barHeight // 2.
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"/ limitMax := view height - barHeight.
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"
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these allow resizing to zero - which is better ?
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"
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limitMin := 0.
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limitMax := view innerHeight.
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movedHandle > 1 ifTrue:[
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limitMin := (subViews at:movedHandle) origin y + (barHeight // 2)
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].
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movedHandle < (subViews size - 1) ifTrue:[
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limitMax := (subViews at:(movedHandle + 2)) origin y - barHeight
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].
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].
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limitMax := limitMax - barHeight.
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(pos < limitMin) ifTrue:[ "check against view limits"
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pos := limitMin
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] ifFalse:[
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(pos > limitMax) ifTrue:[
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pos := limitMax
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]
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].
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isHorizontal ifTrue:[
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oldHx := prevPos.
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newHx := pos.
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oldHy := newHy := 0.
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] ifFalse:[
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oldHy := prevPos.
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newHy := pos.
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oldHx := newHx := 0.
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].
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view invertHandleBarAtX:oldHx y:oldHy.
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view invertHandleBarAtX:newHx y:newHy.
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prevPos := pos
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!
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buttonPress:button x:bx y:by
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"button was pressed - if it hits a handle, start move"
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|handle barHeight group|
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((button == 1) or:[button == #select]) ifTrue:[
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handle := 1.
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barHeight := view barHeight.
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"
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search the handle, invert the first time
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"
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view handleOriginsDo:[:hPoint |
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|hx hy|
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isHorizontal ifTrue:[
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hx := hPoint x.
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(bx between:hx and:(hx + barHeight)) ifTrue:[
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movedHandle := handle.
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prevPos := hx.
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startPos := bx - hx.
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view invertHandleBarAtX:hx y:0.
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(group := view windowGroup) notNil ifTrue:[
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group showCursor:view cursor
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].
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^ self
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].
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] ifFalse:[
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hy := hPoint y.
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(by between:hy and:(hy + barHeight)) ifTrue:[
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movedHandle := handle.
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prevPos := hy.
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startPos := by - hy.
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view invertHandleBarAtX:0 y:hy.
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(group := view windowGroup) notNil ifTrue:[
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group showCursor:view cursor
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].
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^ self
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].
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].
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handle := handle + 1
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].
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movedHandle := nil
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] ifFalse:[
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super buttonPress:button x:bx y:by
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]
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!
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buttonRelease:button x:x y:y
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"end bar-move"
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|aboveView belowView aboveIndex belowIndex
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newPos oldPos group subViews
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relCornerAbove fromIndex toIndex|
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((button == 1) or:[button == #select]) ifTrue:[
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movedHandle isNil ifTrue:[^ self].
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(group := view windowGroup) notNil ifTrue:[
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group restoreCursors
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].
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"undo the last invert"
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isHorizontal ifTrue:[
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view invertHandleBarAtX:prevPos y:0.
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] ifFalse:[
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view invertHandleBarAtX:0 y:prevPos.
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].
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"compute the new relative heights"
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aboveIndex := movedHandle.
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belowIndex := movedHandle + 1.
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movedHandle := nil.
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subViews := view subViews.
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aboveView := subViews at:aboveIndex.
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belowView := subViews at:belowIndex.
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relCornerAbove := aboveView relativeCorner.
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isHorizontal ifTrue:[
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oldPos := relCornerAbove x.
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newPos := (prevPos + startPos / view width) asFloat.
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aboveView relativeCorner:newPos @ relCornerAbove y.
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belowView relativeOrigin:newPos @ belowView relativeOrigin y.
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] ifFalse:[
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oldPos := relCornerAbove y.
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newPos := (prevPos + startPos / view height) asFloat.
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aboveView relativeCorner:relCornerAbove x @ newPos.
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belowView relativeOrigin:belowView relativeOrigin x @ newPos.
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].
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view lockRedraw.
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oldPos > newPos ifTrue:[
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fromIndex := aboveIndex. toIndex := belowIndex.
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] ifFalse:[
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fromIndex := belowIndex. toIndex := aboveIndex.
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].
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view resizeSubviewsFrom:fromIndex to:toIndex.
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view redrawHandlesFrom:aboveIndex to:belowIndex.
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view unlockRedraw.
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] ifFalse:[
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super buttonRelease:button x:x y:y
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]
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! !
|
104
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|