Re: Status for long-running operation

[Lex Trotman <elextr gmail com>]

On 18 September 2010 08:22, Jeffrey Barish <jeff_barish earthlink net> wrote:
> Jeffrey Barish wrote:
>
>> My application has one operation that runs for a long time (~1 minute).
>> During this time, the user is not allowed to do anything.  Nevertheless, I
>> felt that it was important to give the user some feedback that the
>> application is still alive and that the operation is running.  My solution
>> was to print a message in a TextBuffer and follow the message with a
>> string
>> of dots that grows in length by one every second.  To get the TextView to
>> update, I used events_pending/main_iteration.  This all works nicely.
>> However, because of the events_pending/main_iteration statements, the
>> entire
>> GUI is now alive.  Thus, the user is able to do things that disrupt the
>> long-running operation.  Basically, what I want is a way to get the
>> TextView to update so that I can update the progress indicator but for
>> everything
>> else still to be locked out.  Is there a way to do this?
>
> Here's a possibility that seems to work:
>
> I used event_handler_set to define an event handler that filters out all
> events (by not calling main_do_event) except EXPOSE while the long-running
> operation is underway.  I wish that there were a way to restore the default
> event handler, but there is only a set method.  Anything bad about this
> solution?
> --
> Jeffrey Barish
>
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You should show progress and block the application by showing a modal
dialog containing a progress bar.

Cheers
Lex