A pane to arrange controls in columns🔗ℹ

This module provides a new class columns-pane% that can be used to arrange widgets in a table like fashon, making all widgets in a column of the same width

class
columns-pane% : class?

superclass: vertical-pane%

A columns pane arranges its subwindows in columns. The number of columns must be given in advance and initializes to 1. See also pane%.

constructor
(new columns-pane%
    [parent parent]
    [columns columns]
    [ [vert-margin vert-margin]
    [horiz-margin horiz-margin]
    [border border]
    [spacing spacing]
    [alignment alignment]
    [min-width min-width]
    [min-height min-height]
    [stretchable-width stretchable-width]
    [stretchable-height stretchable-height]])
→ (is-a?/c columns-pane%)
   parent :
(or/c (is-a?/c frame%) (is-a?/c dialog%)
      (is-a?/c panel%) (is-a?/c pane%))
  columns : 1
  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))
= '(left center)
  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
method
(send a-columns-pane column-min-width c [w]) → dimension-integer?
  c : column-index
  w : or/c = dimenstion-integer?
Gets or sets the minimum width (in pixels) of the given column c.
Returns the currently set minimum width for the given column.
method
(send a-columns-pane column-align c align)
→ (or/c 'left 'center 'right)
  c : column-index
  align : (or/c 'left 'center 'right)
Gets or sets the horizontal alignment of a given column c.
Returns the currently set alignment.
Note. Use this right after declaring the columns pane and before adding any children.
method
(send a-columns-pane column-keep-min-width c
[ k]) → boolean?
  c : column-index
  k : or/c = boolean
Gets or sets the keep minimal width parameter for a given column c.
Returns the currently set value.
When this parameter is set for a column, the column-width will not shrink when the contents of the column get less width. It will grow however, when needed.

1 Example code🔗ℹ

(require racket/gui)
(require columns-pane)

(define win (new frame% [label "A new frame"]))
(define grid-group (new group-box-panel%
                        [label "A new group"] [parent win]
                        [horiz-margin 10] [vert-margin 10]))

; Adding the columns pane with 3 columns
(define g (new columns-pane% [parent grid-group] [columns 3]))

(define btn1 (new button% [parent g] [label "Button 1"]))
(define g1 (new gauge%  [parent g] [stretchable-width #t] [label "gauge 1"] [range 100]))
(define lbl1 (new message% [parent g] [label "This is lbl 1"]))

(define btn2 (new button% [parent g] [label "Btn 2"]))
(define lbl2 (new message% [parent g] [label "This is lbl 2"]))

; Now, when the window is shown, the columns pane will arrange it's children
; to have the same width in each column.
(send win show #t)

2 Same panel without columns-pane🔗ℹ

(require racket/gui)

(define win (new frame% [label "A new frame"]))
(define grid-group (new group-box-panel%
                        [label "A new group"] [parent win]
                        [horiz-margin 10] [vert-margin 10]))

; Adding the columns pane with 3 columns
(define h1 (new horizontal-pane% [parent grid-group]))

(define btn1 (new button% [parent h1] [label "Button 1"]))
(define g1 (new gauge%  [parent h1] [stretchable-width #t] [label "gauge 1"] [range 100]))
(define lbl1 (new message% [parent h1] [label "This is lbl 1"]))

(define h2 (new horizontal-pane% [parent grid-group]))
(define btn2 (new button% [parent h2] [label "Btn 2"]))
(define lbl2 (new message% [parent h2] [label "This is lbl 2"]))

(send win show #t)