A panel is a both a container and a containee window. It serves mainly as a geometry management device, but the 'border creates a container with a border. Unlike a pane% object, a panel% object can be hidden or disabled.

A panel% object has a degenerate placement strategy for managing its children: it places each child as if it was the only child of the panel. The horizontal-panel% and vertical-panel% classes provide useful geometry management for multiple children.

Changed in version 1.3 of package gui-lib: Changed the placement strategy to stretch and align children, instead of placing all children at the top-left corner.

constructor
( new panel%
[parentparent]
[ [stylestyle]
[enabledenabled]
[vert-marginvert-margin]
[horiz-marginhoriz-margin]
[borderborder]
[spacingspacing]
[alignmentalignment]
[min-widthmin-width]
[min-heightmin-height]
[stretchable-widthstretchable-width]
[stretchable-heightstretchable-height]])
→(is-a?/c panel% )

parent :
(or/c (is-a?/c frame% )(is-a?/c dialog% )
(is-a?/c panel% )(is-a?/c pane% ))

style :
(listof (or/c 'border'deleted
'hscroll'auto-hscroll'hide-hscroll
'vscroll'auto-vscroll'hide-vscroll))
= null
enabled:any/c =#t
vert-margin:spacing-integer? =0
horiz-margin:spacing-integer? =0
border:spacing-integer? =0
spacing:spacing-integer? =0

alignment :
(list/c (or/c 'left'center'right)
(or/c 'top'center'bottom))
= '(centercenter)
min-width:(or/c dimension-integer? #f)=#f
min-height:(or/c dimension-integer? #f)=#f
stretchable-width:any/c =#t
stretchable-height:any/c =#t

If the 'border style is specified, the window is created with a thin border (in which case the client size of the panel may be less than its total size). If style includes 'deleted, then the panel is created as hidden, and it does not affect its parent’s geometry; the panel can be made active later by calling parent’s add-child method.

If the 'hscroll or 'vscroll style is specified, then the panel includes a scrollbar in the corresponding direction, and the panel’s own size in the corresponding direction is not constrained by the size of its children subareas. The 'auto-hscroll and 'auto-vscroll styles imply 'hscroll and 'vscroll, respectively, but they cause the corresponding scrollbar to disappear when no scrolling is needed in the corresponding direction; the 'auto-vscroll and 'auto-hscroll modes assume that children subareas are placed using the default algorithm for a panel% , vertical-panel% , or horizontal-panel% . The 'hide-hscroll and 'hide-vscroll styles imply 'auto-hscroll and 'auto-vscroll, respectively, but the corresponding scroll bar is never made visible (while still allowing the panel content to exceed its own size).

For information about the enabled argument, see window<%> . For information about the horiz-margin and vert-margin arguments, see subarea<%> . For information about the border, spacing, and alignment arguments, see area-container<%> . For information about the min-width, min-height, stretchable-width, and stretchable-height arguments, see area<%> .

Changed in version 1.25 of package gui-lib: Added 'hide-vscroll and 'hide-hscroll.

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