Thanks for that, it worked.
Is there a reason why a new text% object has undo disabled? I could not find
any mention of it in the documentation and 'set-max-undo-history' is not the
first place one would look :-)
On Tuesday, September 20, 2016 at 10:14:03 PM UTC+8, Matthew Flatt wrote:
> Use the `set-max-undo-history` method to enable undo history:
> (send m-edit set-max-undo-history 1000)
> At Tue, 20 Sep 2016 06:24:49 -0700 (PDT), Alex Harsanyi wrote:
> > Consider the following example (this is pretty much the code from
> > http://docs.racket-lang.org/gui/editor-overview.html?q=text%25 except I
> > also
> > added a text-field%):
> > #lang racket/gui
> > (define f (new frame% [label "Simple Edit"]
> > [width 200]
> > [height 200]))
> > (define c (new editor-canvas% [parent f]))
> > (define t (new text%))
> > (send c set-editor t)
> > (new text-field% [parent f] [label ""] [style '(multiple)])
> > (define mb (new menu-bar% [parent f]))
> > (define m-edit (new menu% [label "Edit"] [parent mb]))
> > (define m-font (new menu% [label "Font"] [parent mb]))
> > (append-editor-operation-menu-items m-edit #f)
> > (append-editor-font-menu-items m-font)
> > (send f show #t)
> > In the text% editor, normal text operations (select all, cut/copy/paste)
> > work
> > fine, but undo does not, the undo menu is grayed out and Ctrl-Z does not
> > work. Undo works fine in the text-field% below.
> > How do I add undo functionality to text%?
> > Thanks,
> > Alex.
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