Re: Gtk3::Application example (WAS: Override of Gtk3::Application->new)

[Jeremy Volkening <jdv base2bio com>]

Max,

My original email just bounced back from your address so you probably didn't
see it. I'm copying it below again (only to the list this time). This includes
an example of a working Gtk3::Application.

Jeremy

On Sun, 29 May 2016 13:11:50 -0500
Jeremy Volkening <jdv base2bio com> wrote:

> Hello Max,
>
> The structure of a GtkApplication program is different than that of a
> "Gtk2 mainloop"-style application. You should't call Gtk3::init -
> that is handled automatically. All of the program initialization is
> supposed to be done inside of the 'startup' and 'activate' callbacks.
> Instead of calling Gtk3::main and Gtk3::quit, you call the
> GApplication 'run' and 'quit' methods (therefore you also need to
> import Glib::IO). This is the most useful site I've found:
>
> https://wiki.gnome.org/HowDoI/GtkApplication
>
> The problems you're encountering relate to the fact that the App
> hasn't been intitialized yet. At the bottom is a working example.
>
> Regards,
> Jeremy
>
>
> use strict;
> use warnings;
>
> use Gtk3;
> use Glib::IO;
> use Glib qw/TRUE FALSE/;
>
> my $app = Gtk3::Application->new('app.test', 'flags-none');
>
> $app->signal_connect('startup'  => \&_init     );
> $app->signal_connect('activate' => \&_build_ui );
> $app->signal_connect('shutdown' => \&_cleanup  );
>
> $app->run(\ ARGV);
>
> exit;
>
> sub _init {
>
>     my ($app) = @_;
>
>     # Handle program initialization
>     print "Hello world!\n";
>
> }
>
> sub _build_ui {
>
>     my ($app) = @_;
>
>     my $window = Gtk3::ApplicationWindow->new($app);
>     $window->set_title ("Gtk3 Menu Example");
>     $window->set_default_size (200, 200);
>     $window->signal_connect( "delete_event" => sub {$app->quit()} );
>     $window->show();
>
> }
>
> sub _cleanup {
>
>     my ($app) = @_;
>
>     # Handle cleanup
>     print "Goodbye world!\n";
>     
> }