On Fri, Dec 21, 2012 at 10:59 AM, <herak...@gmx.de> wrote: > Ahhhh, > ok thank you very much. By the way, when I make a tab-panel with multiple > tabs and add a list-box to the tab-panel it appears on all tab pages. So > how can I specify the tab/tabindex as parent to the list-box? >
You need to change the children of the tab-panel when the user changes the tab. There have been examples of this on the mailing list, so you may search it for "tab-panel" probably. Since it's not very obvious how to do it, here is a working example: http://pastebin.com/2C920yW9 > And is it possible to init the list-box with more choices as one. In the > example in the doc there is a initialisation only for one column. I would > like to init say 4 columns with data(as vector or map??). > For this I don´t found any example, and I hope you could give me the place > where it stays or an suggestion.. > Apparently, you can't use the constructor to initialize theother columns, but you can still do it with `set': (send a-list-box set choices ...) → void? choices : (listof label-string?) Clears the list box and installs a new list of items. The number of choices lists must match the number of columns, and all choices lists must have the same number of items, otherwise an exn:fail:contract exception is raised. Cheers, Laurent > Yours, > > -------- Original-Nachricht -------- > > Datum: Thu, 20 Dec 2012 12:44:52 +0100 > > Von: Laurent <laurent.ors...@gmail.com> > > An: murat demirtas <herak...@gmx.de> > > CC: racket <users@racket-lang.org> > > Betreff: Re: [racket] label-string > > > Hi, > > > > From the Help Desk: > > (new tab-panel% > > [choices choices] > > [...] > > > > → (is-a?/c tab-panel%) > > choices : (listof label-string?) > > > > So it wants a list of label-string. > > Then clicking on `label-string?` gives: > > > > """ > > (label-string? v) → boolean? > > > > v : any/c > > Returns #t if v is a string whose length is less than or equal to 200. > > > > This predicate is typically used as the contract for strings that appear > > in > > GUI objects. In some cases, such as the label in a button% or menu-item% > > object, the character & is treated specially to indicate that the > > following > > character is used in keyboard navigation. See set-label in > > labelled-menu-item<%> for one such example. In other cases, such as the > > label on a frame%, & is not treated specially. > > """ > > > > So you could do the following: > > > > (define tab-panel (new tab-panel% > > (parent dialog) > > (choices (map ~a (vector->list Vec))))) > > > > Laurent > > > > On Thu, Dec 20, 2012 at 12:19 PM, <herak...@gmx.de> wrote: > > > > > Hello friends, > > > > > > how can I convert a vector (define Vec #(1 2 3 4)) > > > > > > to a label-string to make a tab-panel?? > > > > > > I try this > > > (define tab-panel (new tab-panel% > > > (parent dialog) > > > (choices (vector->list Vec)))) > > > > > > but it fails due to contract violation: expected: label-string? > > > > > > So what ist a label-string??? > > > > > > > > > Yours, > > > ____________________ > > > Racket Users list: > > > http://lists.racket-lang.org/users > > > >
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