"

 COPYRIGHT (c) 1989 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.

"

"{ Package: 'stx:libwidg' }"

PanelView subclass:#MultiColumnPanelView

	instanceVariableNames:'columnWidths'

	classVariableNames:''

	poolDictionaries:''

	category:'Views-Layout'

!

!MultiColumnPanelView class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1989 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.

"

!

documentation

"

    a View which arranges its child-views in a vertical column.

    All real work is done in PanelView - except the layout computation is

    redefined here.

    The layout is controlled by the instance variables: 

	horizontalLayout and verticalLayout

    in addition to 

	horizontalSpace and verticalSpace.

    The vertical layout can be any of:

	#top            arrange elements at the top

	#topSpace       arrange elements at the top, start with spacing

	#bottom         arrange elements at the bottom

	#bottomSpace    arrange elements at the bottom, start with spacing

	#center         arrange elements in the center; ignore verticalSpace

	#spread         spread elements evenly; ignore verticalSpace

	#spreadSpace    spread elements evenly with spacing at ends; ignore verticalSpace

	#fit            like #spread, but resize elements for tight packing; ignore verticalSpace

	#fitSpace       like #fit, with spacing; ignore verticalSpace

	#topFit         like #top, but resize the last element to fit

	#topSpaceFit    like #topSpace, but resize the last element to fit

	#bottomFit      like #bottom, but resize the first element to fit

	#bottomSpaceFit like #bottomSpace, but resize the first element to fit

    the horizontal layout can be:

	#left           place element at the left

	#leftSpace      place element at the left, offset by horizontalSpace

	#center         place elements horizontally centered; ignore horizontalSpace

	#right          place it at the right

	#rightSpace     place it at the right, offset by horizontalSpace

	#fit            resize elements horizontally to fit this panel; ignore horizontalSpace

	#fitSpace       like #fit, but add spacing; ignore horizontalSpace

	#leftMax        like #left, but resize elements to max of them

	#leftSpaceMax   like #leftSpace, but resize elements

	#centerMax      like #center, but resize elements

	#rightMax       like #right, but resize elements to max of them

	#rightSpaceMax  like #rightSpace, but resize elements

    The defaults is #center for both directions.

    The layout is changed by the messages #verticalLayout: and #horizontalLayout:.

    For backward compatibility (to times, where only vLayout existed), the simple

    #layout: does the same as #verticalLayout:. Do not use this old method.

    The panel assumes, that the elements do not resize themselfes, after it

    became visible. This is not true for all widgets (buttons or labels may

    like to change). If you have changing elements, tell this to the panel

    with 'aPanel elementsChangeSize:true'. In that case, the panel will react

    to size changes, and reorganize things.

    If none of these layout/space combinations is exactly what you need in

    your application, create a subclass, and redefine the setChildPositions method.

    CAVEAT: this class started with #top and no horizontal alignments;

    as time went by, more layouts were added and the setup should be changed

    to use different selectors for space, max-resize and alignment

    (i.e. having more and more layout symbols makes things a bit confusing ...)

    [see also:]

	HorizontalPanelView

	VariableVerticalPanel VariableHorizontalPanel

	Label

    [author:]

	Claus Gittinger

"

!

examples

"

    These examples demonstrate the effect of different layout

    settings.

    You should try more examples, combining spacing and different

    verticalLayout:/horizontalLayout: combinations.

    example: default layout (centered)

                                                                        [exBegin]

        |v p b1 b2 b3 l1 l2 l3|

        v := StandardSystemView new.

        v label:'center (default)'.

        p := MultiColumnPanelView in:v.

        p origin:(0.0 @ 0.0) corner:(1.0 @ 1.0).

        p columnWidths:#(0.3 0.7).

        l1 := Label label:'label1' in:p.

        b1 := Button label:'button1' in:p.

        l2 := Label label:'l2' in:p.

        b2 := Button label:'b2' in:p.

        l3 := Label label:'lab3' in:p.

        b3 := Button label:'butt3' in:p.

        v extent:100 @ 300.

        v open

                                                                        [exEnd]

"

! !

!MultiColumnPanelView methodsFor:'accessing'!

columnWidths:something

    something ~= columnWidths ifTrue:[

        columnWidths := something.

        self layoutChanged

    ].

!

horizontalLayout

    "return the horizontal layout as symbol.

     the returned value is one of

	#left           place element at the left

	#leftSpace      place element at the left, offset by horizontalSpace

	#center         place elements horizontally centered; ignore horizontalSpace

	#right          place it at the right

	#rightSpace     place it at the right, offset by horizontalSpace

	#fit            resize elements horizontally to fit this panel; ignore horizontalSpace

	#fitSpace       like #fit, but add spacing; ignore horizontalSpace

	#leftMax        like #left, but resize elements to max of them

	#leftSpaceMax   like #leftSpace, but resize elements

	#centerMax      like #center, but resize elements

	#rightMax       like #right, but resize elements to max of them

	#rightSpaceMax  like #rightSpace, but resize elements

      the default is #centered

    "

    ^ hLayout

!

horizontalLayout:aSymbol

    "change the horizontal layout as symbol.

     The argument, aSymbol must be one of:

	#left           place element at the left

	#leftSpace      place element at the left, offset by horizontalSpace

	#center         place elements horizontally centered; ignore horizontalSpace

	#right          place it at the right

	#rightSpace     place it at the right, offset by horizontalSpace

	#fit            resize elements horizontally to fit this panel; ignore horizontalSpace

	#fitSpace       like #fit, but add spacing; ignore horizontalSpace

	#leftMax        like #left, but resize elements to max of them

	#leftSpaceMax   like #leftSpace, but resize elements

	#centerMax      like #center, but resize elements

	#rightMax       like #right, but resize elements to max of them

	#rightSpaceMax  like #rightSpace, but resize elements

      the default (if never changed) is #centered

    "

    (hLayout ~~ aSymbol) ifTrue:[

	hLayout := aSymbol.

	self layoutChanged

    ]

!

layout:something

    "OBSOLETE compatibility interface. Will vanish.

     leftover for historic reasons - do not use any more.

     In the meantime, try to figure out what is meant ... a kludge"

    <resource:#obsolete>

    something isLayout ifTrue:[^ super layout:something].

    self obsoleteMethodWarning:'use #verticalLayout:'.

    ^ self verticalLayout:something

    "Modified: 31.8.1995 / 23:08:54 / claus"

!

verticalLayout

    "return the vertical layout as a symbol.

     the returned value is one of

	#top            arrange elements at the top

	#topSpace       arrange elements at the top, start with spacing

	#bottom         arrange elements at the bottom

	#bottomSpace    arrange elements at the bottom, start with spacing

	#center         arrange elements in the center; ignore verticalSpace

	#spread         spread elements evenly; ignore verticalSpace

	#spreadSpace    spread elements evenly with spacing at ends; ignore verticalSpace

	#fit            like #spread, but resize elements for tight packing; ignore verticalSpace

	#fitSpace       like #fit, with spacing; ignore verticalSpace

	#topFit         like #top, but resize the last element to fit

	#topSpaceFit    like #topSpace, but resize the last element to fit

	#bottomFit      like #bottom, but resize the first element to fit

	#bottomSpaceFit like #bottomSpace, but extend the first element to fit

      the default is #centered

    "

    ^ vLayout

    "Modified: 17.8.1997 / 15:20:13 / cg"

!

verticalLayout:aSymbol

    "change the vertical layout as a symbol.

     The argument, aSymbol must be one of:

	#top            arrange elements at the top

	#topSpace       arrange elements at the top, start with spacing

	#bottom         arrange elements at the bottom

	#bottomSpace    arrange elements at the bottom, start with spacing

	#center         arrange elements in the center; ignore verticalSpace

	#spread         spread elements evenly; ignore verticalSpace

	#spreadSpace    spread elements evenly with spacing at ends; ignore verticalSpace

	#fit            like #spread, but resize elements for tight packing; ignore verticalSpace

	#fitSpace       like #fit, with spacing; ignore verticalSpace

	#topFit         like #top, but resize the last element to fit

	#topSpaceFit    like #topSpace, but resize the last element to fit

	#bottomFit      like #bottom, but resize the first element to fit

	#bottomSpaceFit like #bottomSpace, but extend the first element to fit

      the default (if never changed) is #centered

    "

    (vLayout ~~ aSymbol) ifTrue:[

	vLayout := aSymbol.

	self layoutChanged

    ]

    "Modified: 17.8.1997 / 15:19:58 / cg"

! !

!MultiColumnPanelView methodsFor:'initialization'!

initialize

    super initialize.

    hLayout := #fit.

    vLayout := #top.

    columnWidths := #(0.5 0.5).

! !

!MultiColumnPanelView methodsFor:'layout'!

setChildPositions

    "(re)compute position of every child"

    |xpos ypos space sumOfHeights numChilds l hEach hInside hL vL

     maxWidth maxHeight resizeToMaxV resizeToMaxH m2 subViews restHeight

     rowsPerCol maxWidthPerCol col numCols cX cY bw|

    subViews := self subViewsToConsider.

    subViews size == 0 ifTrue:[^ self].

"/    self extentChangedFlag ifTrue:[

"/        ext := self computeExtent.

"/        width := ext x.

"/        height := ext y.

"/    ].

    space := verticalSpace.

    numChilds := subViews size.

    numCols := columnWidths size max:1.

    bw := self borderWidth.

    m2 := margin * 2.

    hInside := height - m2 + (bw*2) - subViews last borderWidth.

    hL := hLayout.

    vL := vLayout.

    rowsPerCol := Array new:numCols withAll:0.

    maxWidthPerCol := Array new:numCols withAll:0.

    maxHeight := 0.

    col := 1.

    subViews do:[:child |

        |childsW childsH|

        childsW := child widthIncludingBorder.

        childsH := child heightIncludingBorder.

        maxHeight := maxHeight max:childsH.

        maxWidthPerCol at:col put:((maxWidthPerCol at:col) max:childsW).

        rowsPerCol at:col put:(rowsPerCol at:col)+1.

        col := col + 1.

        col > numCols ifTrue:[ col := 1 ].

    ].

"/ new

    xpos := 0.

    ypos := 0.

    col := 1.

    subViews do:[:child |

        col == numCols ifTrue:[

            cX := width.

        ] ifFalse:[

            cX := xpos + (width // numCols).

        ].

        cY := ypos + maxHeight.

        child origin:(xpos@ypos)"corner:(cX @ cY)".

        hLayout == #fit ifTrue:[

            child width:(cX - xpos + 1).

        ].

        col := col + 1.

        col > numCols ifTrue:[ 

            col := 1.

            xpos := 0.

            ypos := cY + verticalSpace.

        ] ifFalse:[

            xpos := cX + horizontalSpace.

        ].

    ].

    ^ self.

"/ old

    resizeToMaxV := false.

    (vL endsWith:'Max') ifTrue:[

        resizeToMaxV := true.

        hEach := maxHeight := subViews inject:0 into:[:maxSoFar :child | maxSoFar max:child heightIncludingBorder].

        vL := (vL copyWithoutLast:3) asSymbol.

    ].

    numChilds == 1 ifTrue:[

        (vL == #topFit or:[vL == #bottomFit]) ifTrue:[

            vL := #fit

        ].

        (vL == #topSpaceFit or:[vL == #bottomSpaceFit]) ifTrue:[

            vL := #fitSpace

        ].

    ].

    vL == #fitSpace ifTrue:[

        "

         adjust childs extents and set origins.

         Be careful to avoid accumulation of rounding errors

        "

        hEach := (hInside - ((numChilds + 1) * space)) / numChilds.

        ypos := space + margin - bw.

    ] ifFalse:[

        vL == #fit ifTrue:[

            "

             adjust childs extents and set origins.

             Be careful to avoid accumulation of rounding errors

            "

            hEach := (hInside - ((numChilds - 1) * space)) / numChilds.

            ypos := margin - bw.

        ] ifFalse:[

            l := vL.

            "

             compute net height needed

            "

            resizeToMaxV ifTrue:[

                sumOfHeights := subViews inject:0 into:[:sumSoFar :child | sumSoFar + maxHeight + (child borderWidth*2)].

            ] ifFalse:[

                sumOfHeights := subViews inject:0 into:[:sumSoFar :child | sumSoFar + child heightIncludingBorder].

                "/ adjust - do not include height of last(first) element if doing a fit

                (vL == #topFit or:[vL == #topSpaceFit]) ifTrue:[

                    sumOfHeights := sumOfHeights - subViews last heightIncludingBorder.

                ] ifFalse:[

                    (vL == #bottomFit or:[vL == #bottomSpaceFit]) ifTrue:[

                        sumOfHeights := sumOfHeights - subViews first heightIncludingBorder.

                    ]

                ].

            ].

            restHeight := height - sumOfHeights - ((numChilds-1)*space).

            ((l == #center) and:[numChilds == 1]) ifTrue:[l := #spread].

            (l == #spread and:[numChilds == 1]) ifTrue:[l := #spreadSpace].

            "

             compute position of topmost subview and space between them;

             if they do hardly fit, leave no space between them 

            "

            ((sumOfHeights >= (height - m2))

            and:[l ~~ #fixTopSpace and:[l ~~ #fixTop]]) ifTrue:[

                "

                 if we have not enough space for all the elements, 

                 fill them tight, and show what can be shown (at least)

                "

                ypos := margin.

                space := 0

            ] ifFalse:[

                l == #fixTopSpace ifTrue:[

                    l := #topSpace

                ] ifFalse:[

                    l == #fixTop ifTrue:[

                        l := #top 

                    ]

                ].

                ((l == #bottom) or:[l == #bottomSpace

                or:[l == #bottomFit or:[l == #bottomSpaceFit]]]) ifTrue:[

                    ypos := restHeight - (space * (numChilds - 1)).

"/

"/                    bw == 0 ifTrue:[

"/                        ypos := ypos + space 

"/                    ].

"/           

                    (l == #bottomSpace

                    or:[l == #bottomSpaceFit]) ifTrue:[

                        ypos >= space ifTrue:[

                            ypos := ypos - space

                        ]

                    ].

                    ypos := ypos - margin.

                    ypos < 0 ifTrue:[

                        space := space min:(restHeight // (numChilds + 1)).

                        ypos := restHeight - (space * numChilds).

                    ]

                ] ifFalse: [

                    (l == #spread) ifTrue:[

                        space := (restHeight - m2) // (numChilds - 1).

                        ypos := margin.

                        (space == 0) ifTrue:[

                            ypos := restHeight // 2

                        ]

                    ] ifFalse: [

                      (l == #spreadSpace) ifTrue:[

                        space := (restHeight - m2) // (numChilds + 1).

                        ypos := space + margin.

                        (space == 0) ifTrue:[

                            ypos := restHeight // 2

                        ]

                      ] ifFalse: [

                        ((l == #top) or:[l == #topSpace

                        or:[l == #topFit or:[l == #topSpaceFit]]]) ifTrue:[

                            space := space min:(restHeight - m2) // (numChilds + 1).

                            (vL == #fixTop or:[vL == #fixTopSpace]) ifTrue:[

                                space := space max:verticalSpace.

                            ] ifFalse:[

                                space := space max:0.

                            ].

                            (l == #topSpace or:[l == #topSpaceFit]) ifTrue:[

                                ypos := space + margin.

                            ] ifFalse:[

                                "/

                                "/ if the very first view has a 0-level AND

                                "/ my level is non-zero, begin with margin

                                "/

                                true "(margin ~~ 0 and:[subViews first level == 0])" ifTrue:[

                                    ypos := margin

                                ] ifFalse:[

                                    ypos := 0

                                ]

                            ]

                        ] ifFalse:[

                            "center"

                            ypos := (restHeight - ((numChilds - 1) * space)) // 2.

                            ypos < 0 ifTrue:[

                                space := restHeight // (numChilds + 1).

                                ypos := (restHeight - ((numChilds - 1) * space)) // 2.

                            ]

                        ]

                      ]

                    ]

                ]

            ].

        ].

    ].

    resizeToMaxH := false.

    (hL endsWith:'Max') ifTrue:[

        resizeToMaxH := true.

        maxWidth := subViews inject:0 into:[:maxSoFar :child | maxSoFar max:child widthIncludingBorder].

        hL := (hL copyWithoutLast:3) asSymbol.

    ].

    "

     now set positions

    "

    subViews keysAndValuesDo:[:index :child |

        |xpos advance bwChild wChild newWChild x2|

        wChild := child widthIncludingBorder.

        bwChild := child borderWidth.

        elementsChangeSize ifTrue:[

            "to avoid a recursion when we change the elements size"

            child removeDependent:self.

        ].

        resizeToMaxH ifTrue:[

            child width:(wChild := maxWidth - (bwChild  * 2)).

        ].

        hL == #left ifTrue:[

            xpos := 0 - bw + margin.

        ] ifFalse:[

            hL == #leftSpace ifTrue:[

                xpos := horizontalSpace + margin

            ] ifFalse:[

                hL == #right ifTrue:[

                    xpos := width - wChild - margin

                ] ifFalse:[

                    hL == #rightSpace ifTrue:[

                        xpos := width - horizontalSpace - wChild - margin.