"

 COPYRIGHT (c) 1995 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

'From Smalltalk/X, Version:2.10.4 on 6-mar-1995 at 20:00:02'!

Controller subclass:#VariablePanelController

	 instanceVariableNames:'movedHandle prevPos startPos isHorizontal'

	 classVariableNames:''

	 poolDictionaries:''

	 category:'Interface-Support'

!

!VariablePanelController class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1995 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

version

"

$Header: /cvs/stx/stx/libwidg/VariablePanelController.st,v 1.1 1995-03-18 05:16:33 claus Exp $

"

! !

!VariablePanelController methodsFor:'event handling'!

buttonMotion:button x:bx y:by

    "mouse-button was moved while pressed;

     clear prev handleBar and draw handle bar at new position" 

    |pos limitMin limitMax subViews barHeight|

    movedHandle isNil ifTrue: [^ self].          "should not happen"

    "speedup - if there is already another movement, 

     ignore thisone ... "

    view buttonMotionEventPending ifTrue:[^ self].

    subViews := view subViews.

    barHeight := view barHeight.

    isHorizontal ifTrue:[

	pos := bx - startPos.

	"

	 the two lines below will not allow resizing down to zero

	 (so that some is always visible)

	"

"/        limitMin := barHeight // 2.

"/        limitMax := view width - barHeight.

	"

	 these allow resizing to zero - which is better ?

	"

	limitMin := 0.

	limitMax := view innerWidth.

	movedHandle > 1 ifTrue:[

	    limitMin := (subViews at:movedHandle) origin x + (barHeight // 2)

	].

	movedHandle < (subViews size - 1) ifTrue:[

	    limitMax := (subViews at:(movedHandle + 2)) origin x - barHeight

	].

    ] ifFalse:[

	pos := by - startPos.

	"

	 the two lines below will not allow resizing down to zero

	 (so that some is always visible)

	"

"/        limitMin := barHeight // 2.

"/        limitMax := view height - barHeight.

	"

	 these allow resizing to zero - which is better ?

	"

	limitMin := 0.

	limitMax := view innerHeight.

	movedHandle > 1 ifTrue:[

	    limitMin := (subViews at:movedHandle) origin y + (barHeight // 2)

	].

	movedHandle < (subViews size - 1) ifTrue:[

	    limitMax := (subViews at:(movedHandle + 2)) origin y - barHeight

	].

    ].

    limitMax := limitMax - barHeight.

    (pos < limitMin) ifTrue:[ "check against view limits"

	pos := limitMin

    ] ifFalse:[

	(pos > limitMax) ifTrue:[

	    pos := limitMax

	]

    ].

    isHorizontal ifTrue:[

	view invertHandleBarAtX:prevPos y:0.

	view invertHandleBarAtX:pos y:0.

    ] ifFalse:[

	view invertHandleBarAtX:0 y:prevPos.

	view invertHandleBarAtX:0 y:pos.

    ].

    prevPos := pos

!

buttonRelease:button x:x y:y

    "end bar-move"

    |aboveView belowView aboveIndex belowIndex 

     newPos oldPos group subViews|

    ((button == 1) or:[button == #select]) ifTrue:[

	movedHandle isNil ifTrue:[^ self].

	(group := view windowGroup) notNil ifTrue:[

	    group restoreCursors

	].

	"undo the last invert"

	isHorizontal ifTrue:[

	    view invertHandleBarAtX:prevPos y:0. 

	] ifFalse:[

	    view invertHandleBarAtX:0 y:prevPos. 

	].

	"compute the new relative heights"

	aboveIndex := movedHandle.

	belowIndex := movedHandle + 1.

	movedHandle := nil.

	subViews := view subViews.

	aboveView := subViews at:aboveIndex.

	belowView := subViews at:belowIndex.

	isHorizontal ifTrue:[

	    oldPos := aboveView relativeCorner x.

	    newPos := (prevPos + startPos / view width) asFloat.

	    aboveView relativeCorner:newPos @ aboveView relativeCorner y.

	    belowView relativeOrigin:newPos @ belowView relativeOrigin y.

	] ifFalse:[

	    oldPos := aboveView relativeCorner y.

	    newPos := (prevPos + startPos / view height) asFloat.

	    aboveView relativeCorner:aboveView relativeCorner x @ newPos.

	    belowView relativeOrigin:belowView relativeOrigin x @ newPos.

	].

	view lockRedraw.

	oldPos > newPos ifTrue:[

	    view resizeSubviewsFrom:aboveIndex to:belowIndex.

	] ifFalse:[

	    view resizeSubviewsFrom:belowIndex to:aboveIndex.

	].

	view redrawHandlesFrom:aboveIndex to:belowIndex.

	view unlockRedraw.

    ] ifFalse:[

	super buttonRelease:button x:x y:y

    ]

!

buttonPress:button x:bx y:by

    "button was pressed - if it hits a handle, start move"

    |handle barHeight group|

    ((button == 1) or:[button == #select]) ifTrue:[

	handle := 1.

	barHeight := view barHeight.

	"

	 search the handle, invert the first time

	"

	view handleOriginsDo:[:hPoint |

	    |hx hy|

	    isHorizontal ifTrue:[

		hx := hPoint x.

		(bx between:hx and:(hx + barHeight)) ifTrue:[

		    movedHandle := handle.

		    prevPos := hx.

		    startPos := bx - hx.

		    view invertHandleBarAtX:hx y:0.

		    (group := view windowGroup) notNil ifTrue:[

			group showCursor:view cursor

		    ].

		    ^ self

		].

	    ] ifFalse:[

		hy := hPoint y.

		(by between:hy and:(hy + barHeight)) ifTrue:[

		    movedHandle := handle.

		    prevPos := hy.

		    startPos := by - hy.

		    view invertHandleBarAtX:0 y:hy.

		    (group := view windowGroup) notNil ifTrue:[

			group showCursor:view cursor

		    ].

		    ^ self

		].

	    ].

	    handle := handle + 1

	].

	movedHandle := nil

    ] ifFalse:[

	super buttonPress:button x:bx y:by

    ]

! !