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Re: Test for dialog existence

  • To: mathgroup at
  • Subject: [mg112731] Re: Test for dialog existence
  • From: Albert Retey <awnl at>
  • Date: Tue, 28 Sep 2010 06:50:36 -0400 (EDT)
  • References: <i7seje$pl6$>


> Hi. Can anyone suggest how to test for the existence of a dialog?
> In the example below a dialog is created containing a plot which can
> be modified.  However it seems to be difficult to test whether the
> dialog has been closed.
> This creates the dialog:
> BeginPackage["TestExample`TestDialog`"];
> CreateTestDialog::usage = "CreateTestDialog[] creates a test dialog";
> Begin["`Private`"];
> CreateTestDialog[] :=
>   Module[{}, n = 4;
>    CreateDialog[
>     plot = Dynamic[
>       ParametricPlot[{Sin[t], Sin[n t]}, {t, 0, 2 Pi}, Ticks -> None,
>        ImageSize -> 100]]]];
> End[];
> EndPackage[];
> CreateTestDialog[];
> And the plot can be modified by various means:
> TestExample`TestDialog`Private`n = 8;
> TestExample`TestDialog`Private`n = 2;
> But how can I tell if the dialog has been closed?  The dynamic plot
> object still shows as existing afterwards:
> NameQ["TestExample`TestDialog`Private`plot"]

Here is one possibility, instead of the WindowTitle you could also use a
certain value in the TaggingRules where you could "hide" the additional
information which would identify the dialog, but it would mean some
extra bits of code:

CreateTestDialog::usage="CreateTestDialog[] creates a test dialog";
CreateDialog[plot=Dynamic[ParametricPlot[{Sin[t],Sin[n t]},{t,0,2

(*this will check whether there is an open dialog: *)

on the other hand, I have a feeling that you might implement something
too complicated for what you really want to achieve. Maybe you would get
some useful tips if you try to give us a bigger picture of what you are
trying to do...



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