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From: Guido Tripaldi on 26 Feb 2010 04:04
Thank you Adam! Problem solved!

I would like to propose two improvements in the Documentation Center:
the first is to add the possibility to add custom comments in the
functions/commands help pages (where to store, for example, the
suggestions, like this, found in the user group, some personal sample
code, etc). The second, similar but different, is to add a section in
the help pages with a view to a sort of wiki where every mathgroup users
can add samples, comments and explanations tagged for relevants
functions/commands. This would make it possible to always have readily
available the maximum information for each command.

Cheers,
G


Il giorno 25/feb/2010, alle ore 17.19, Adam Griffith ha scritto:

> ChoiceDialog[] blocks the kernel evaluation until it is closed.
Therefore you could do something like:
>
> TabView[{"Tab1" -> Button["Show ChoiceDialog", result =
ChoiceDialog["This holds eval.. :-)."], Method -> "Queued"], "Tab2"
-> Button["Show MessageDialog", MessageDialog["This works!"];]}]
>
> -Adam
>
>
>
>
>
> Guido Tripaldi wrote:
>> Hi Group,
>> suppose you wanna to display an alert to the user before to continue
the execution of your code when some conditions occur : probably you'll
use ChoiceDialog[], the useful function that "puts up a standard choice
dialog that displays expr together with OK and Cancel buttons, and
returns True if OK is clicked, and False if Cancel is clicked.".
>>
>> But if you use this function inside some Dynamic[] object, it hangs
the kernel. I've tried to find in the documentation some references to
this bad combination without any luck, so I don't understand if this is
a bug or there is something missing in the code.
>>
>> To better explain the problem here is a very basic example:
>>
>> (* just a silly example *)
>> Grid[{
>> {"Choose a dividend: ",
>> PopupMenu[Dynamic[dividend], Table[i, {i, 0, 10}]]},
>> {"Choose a divisor : ", PopupMenu[Dynamic[divisor], Table[i, {i, 0,
10}]]},
>> {"Quotient: ", Dynamic[dividend / divisor]}
>> }, Frame -> All]
>> Dynamic[
>> If[divisor == 0,
>> ChoiceDialog["Uh-oh, you are going to do a division by zero! Please
select a different divisor.", {"Ok"}];
>> ]];
>>
>> Instead, if you use the MessageDialog[] function to show a message
window, all works well, but of course the execution will continue
without waiting for the user action (that is not what I want).
>>
>> Same situation if you try to use ChoiceDialog[] inside a TabView, or
other kind of Views:
>>
>> (* another silly example *)
>> TabView[{
>> "Tab1" -> Button["Show ChoiceDialog", result = ChoiceDialog["This
hangs.. :-(."];],
>> "Tab2" -> Button["Show MessageDialog", MessageDialog["This
works!"];]
>> }]
>>
>>
>> Any suggestion?
>> thanks!
>> G
>>
>> ps
>> M7.0.1.0 on Mac Snow 10.6.2
>>
>> ---
>> Guido Tripaldi
>>
>>
>>
>

---
Guido Tripaldi
imho.gtripaldi.it




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