laybrother has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks,

How can I distinguish between roll-up and roll-down in a Gtk2::Entry->signal_connect('scroll-event' => sub ?

Thanks in advance

Replies are listed 'Best First'.
Re: Gtk2::Entry scroll-event
by Anonymous Monk on Sep 01, 2012 at 00:03 UTC
    interrogate the event object :)
[reply]

      I'm trying to reach this event object.
      Navigating the documentation is beeing a little bit difficult.
      Somebody can give me a hint about how can I refer to a not explicitly instantiated event ?

          my $imp_entry     = Gtk2::Entry->new_with_max_length( 6 ) ;
    ...
    $imp_entry->signal_connect( 'scroll-event' => sub {
            # if($imp_entry->scroll-event->direction() eq 'up'){} !?!?
            $imp_entry->set_text( $imp_entry->get_text() + 0.05 ) ;
        } ) ;

      [download]
      i.e.: as in the Gtk2::Gdk::Event::Scroll doc : 
      METHODS
    ...
    scrolldirection = $eventscroll->direction ($newvalue=0)

      [download]
      What $eventscroll ? Thanks for your attention.
[reply]
[d/l]
[select]

        I'm trying to reach this event object. Navigating the documentation is beeing a little bit difficult. Somebody can give me a hint about how can I refer to a not explicitly instantiated event ?

        I imagine it would be covered in some introductory tutorial (even if it is for the c++)

        Luckily http://search.cpan.org/grep?cpanid=TSCH&release=Gtk2-1.245&string=event&i=1&n=1&C=0 showed 

        110:    # warn Gtk2->get_current_event;

        [download]

        Which worked for me 

        #!/usr/bin/perl --
use Gtk2 -init;
# Gtk2->init; works if you didn't use -init on use
my $window = Gtk2::Window->new ('toplevel');
my $button = Gtk2::Button->new ('Quit');
$button->signal_connect (clicked => sub {
    warn "@_";
    warn Gtk2::Gdk::Event->get;
    warn Gtk2->get_current_event;
    Gtk2->main_quit
});
$window->add ($button);
$window->show_all;
Gtk2->main;
__END__
Gtk2::Button=HASH(0xc6f164) at - line 7.
Warning: something's wrong at - line 8.
Gtk2::Gdk::Event::Key=SCALAR(0xa18d94) at - line 9.

        [download]
[reply]
[d/l]
[select]

Back to Seekers of Perl Wisdom