[plt-scheme] Make a grid / table control in GUI

Hi, people have asked about a data grid on this list a few times.

This is the simplest possible approach. I've tried and abandoned other
approaches when I realised they were too much work for my available free
time.

Comments appreciated.

#lang scheme/gui
;; subclass pasteboard
(define grid-pasteboard%
  (class pasteboard%
    (init-field w h)  ; cell width and height
    ;; override insert to allow insert at a columm and row
    (define/override (insert snip c r) (super insert snip (* c w) (* r h)))
    (super-new)))

(define data-grid-pasteboard%
  (class grid-pasteboard%
    (init-field data-grid)
    (super-new (w 66) (h 26))
    ; populate grid-pasteboard with data-grid to go here
    ; ...

    ))

;; test
(define f (new frame% [label "Simple Edit"]
               [width 200]
               [height 200]))
(define c (new editor-canvas% [parent f]))
(define t (new  grid-pasteboard% (w 66) (h 26)))
(send t insert (make-object string-snip% "at23") 2 3)
(send t insert (make-object string-snip% "at23") 2 2)
(send t insert (make-object string-snip% "at23") 3 2)
(send t insert (make-object string-snip% "at23") 1 1)
(send t insert (make-object string-snip% "at23") 0 0)
(send c set-editor t)
(send f show #t)

-- 

--
Stephen De Gabrielle
stephen.degabrielle at acm.org
Telephone +44 (0)20 85670911
Mobile        +44 (0)79 85189045
http://www.degabrielle.name/stephen
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