Re: GtkEntry - did not receive focus-out-event.

[Daniel Kasak <dkasak nusconsulting com au>]

muppet wrote:

> This is a lot easier to understand with a timeline:
>
> - focus into GtkEntry
>   - GtkEntry installs timeout for cursor blinking
> - focus out of entry
>   - GtkEntry emits focus-out-event
>      - your handler runs **before the default handler**.
>         - your handler traps exception and creates dialog box
>         - dialog box runs nested event loop
>            - event processing continues, focus goes to another widget
>            - entry's cursor blink timeout is still installed, and  
> runs again.
>              entry does not have focus, but timeout has run, so the  
> widget
>              is in an invalid state and calls g_error() with a  
> nastygram.
>      - default handler runs, uninstalls cursor blink timeout
>
> The problem is that you're allowing the event loop to run in your  
> handler for focus-out.
>
> The solution is to get the entry's default handler to run before you  
> do anything that can run a main loop.  There are two easy solutions:
>
>
> a)  use signal_connect_after to have your handler run *after* the  
> default handler for focus-out-event instead of before.
>
> b)  leave the signal connected normally, but in your "catch" block,  
> instead of running the dialog right then, defer it with an idle, like  
> this:
>
>     if ($@) {
>         # oh, crap.  pop up the error message when the main loop is  
> idle.
>         Glib::Idle->add (sub {
>             Gtk2::Ex::Dialogs::ErrorMsg->new_and_run(
>                            title    => "Error in Query!",
>                            text    => "DB Server says:\n$@"
>             );
>             FALSE;  # don't run again
>         });
>         # return control immediately.
>         return FALSE;
>     }
>
>
> and, of course, option c) is "do both."
>
>
> Hope that works.
Yes, that makes it a lot clearer. Thanks :)

--
Daniel Kasak
IT Developer
NUS Consulting Group
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email: dkasak nusconsulting com au
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