[R] tcltk again

Peter Dalgaard
Sat, 29 Dec 2007 20:31:34 -0000

Richard M?ller wrote:
> Hello,
> the admonition of Prof. Ripley to search the documentation to solve my
problem
> helped, today I read a lot more on Tcl/Tk than before ;-)
> But now I'm stuck again. With the help of my script some functions are
plotted
> on the display, then I ask if the user wants to save it as pdf. In windows
I
> use winDialog and it works. But I can't succeed in Linux. In short:
> ----------------------------------------------------
> X11()
> ...
> res <-    tkmessageBox(title="Beenden?",
>       message="Vor dem Beenden als PDF speichern?",
>       icon="question", type="okcancel")
> if (tclvalue(res) == "ok")
> ...
> -----------------------------------------------------
> So far every thing is OK. Now I want a box the user should fill in the
choosen
> filename (with a default)
> and then
> --------------------
> pdf(filename)
> ...
> --------------------
> I experimented with tkgetSaveFile(). But in the moment the user gives the
> filename the file is not yet generated! And I can't generate it in
advance,
> because the filename is not yet specified.
>
I don't see what the problem is here.

fn <- tkgetSaveFile() allows you to select an existing file OR navigate to a
directory and type in the name of a new file. In either case, you can feed
tclvalue(fn) to pdf().

If you cancel the operation, then tclvalue(fn)=="", so test for that
first.


> So I looked for a dialog box. [Some boxes are called "dialog
boxes" though
> they only talk _to_ the user (besides the user's "yes" or
"no")]. Just a
> simple box with a text field the user can type in and the value of this
field
> given back.
> One option was the "modal dialog", but I was not able to pick the
essentials
> out of it. I did not want to press several buttons until the necessary
window
> appears. Also the "editable text window" was not really a
solution.
> Perhaps a small hint again?
> Richard
>
>


--
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