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Re: Problems with ChoiceDialog inside a Dynamic: Bug

  • To: mathgroup at
  • Subject: [mg107830] Re: Problems with ChoiceDialog inside a Dynamic: Bug
  • From: Albert Retey <awnl at>
  • Date: Sun, 28 Feb 2010 04:51:39 -0500 (EST)
  • References: <hm573n$kge$> <> <> <hmak9b$bl9$>


> Modality and blocking the kernel are two separate behaviors. Modal 
> simply means that the user cannot access windows beneath the dialog 
> while a blocking dialog holds the kernel evaluation until closed. So for 
> example, the following dialog is modal and does not block:

That is true and now works as you have described in version 7. In
version 6 it did not work as described above, but probably was planned
to work this way. Good to know it now works...

> In[9]:= CreateDialog[
>   Grid[{{"Does the earth has oceans?"}, {ChoiceButtons[{DialogReturn[
>         answer = True], DialogReturn[answer = False]}]}}],
>   Modal -> True];
> In[10]:= answer
> Out[10]= False
> As for the Dynamic[],
> DynamicModule[{planets, x, habitantq},
>  planets = {"Mercury", "Venus", "Earth"};
>  x = First[planets];
>  PopupMenu[Dynamic[x, {x = #;
>      If[StringMatchQ[x, "Earth"],
>       habitantq =
>        CreateDialog[
>         Column[{"Do you live on earth?",
>           Row[{DefaultButton[
>              Print["This user has selected earth as their planet of \
> residence"]; DialogReturn[True]],
>             CancelButton[DialogReturn[False]]}]}]]]} &,
>    Evaluator -> Automatic, Method -> "Queued"], planets]]
> again, adding Modal->True if desired.

That is really helpful. I'm a little confused about the options you give
to Dynamic: Isn't Evaluator->Automatic the default anyway and have you
any evidence that Method->"Queued" given to a Dynamic will actually do
anything? It is mentioned neither in Options[Dynamic] nor in the
documentation. Also it seems to not the desired effect, since with a
kernel blocking ChoiceDialog instead of the CreateDialog Mathematica
still hangs....



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