Re: a couple of Gnome2::Canvas problems

[zentara <zentara zentara net>]

On Wed, 13 Jul 2005 08:33:21 -0400 (EDT)

> Date: Wed, 13 Jul 2005 17:47:38 +1200
> From: Grant McLean <grant mclean net nz>
> Subject: Re: a couple of Gnome2::Canvas problems
> To: "gtk-perl-list gnome org" <gtk-perl-list gnome org>

> I tried your script and got the same errors.  It piqued my interest
> because the error seem to occur even when all calls to update meter are
> removed.  If I put a die in the update_meter routine, it was never
> reached and yet commenting out the $needle->set and $text->set made the
> errors go away.  Very odd.
>
> I was testing on Debian Sarge and a colleague tested on Debian unstable.
> He did not get the errors.  I'm assuming that the libraries are
> different versions.
>
> Anyway, I was able to make the errors go away by making these 3 changes:
>
> -$window->signal_connect( 'destroy' => \&delete_event );
> +$window->signal_connect( 'delete-event' => \&delete_event );
>
> ...
>
> sub delete_event {
>     $watch->Unwatch;
> -    $canvas->destroy;
>     Gtk2->main_quit;
> -    return 0;
> +    return 1;
> }

That didn't work for me.

> Was there any particular need to destroy the canvas object rather than
> leaving it to be cleaned up?

Well it was just the steps I took in the programming. The first version, had no
text display, and I got the error. The error went away with
adding $canvas->destroy;

Then I added the text, and the error appeared again, but it would not
go away, as long as the text was being updated. I tried to put
$text->destroy but that didn't work. But as muppet pointed out
undef $text  ( and all the canvas items)  does the trick.

> I've attached a tweaked version of the script that uses a Bezier curve
> to create a half circle rather than using an ellipse object.
>
> Cheers
> Grant

Great....I was looking for an example to make a Bezier, but I guess we are
the ones making examples for others. :-) Thanks.  By the way, I did
figure out clipping the circle, by just putting the $canvas into a vbox.

Joe

-- 
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