Gtk2-perl: Create thumbnail pages

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

Hi monkies ;-)

I'm building a tool which will allow me to modify/set EXIF information for images (and prolly more in the future). This is my very first Gtk2 application. I've found the gtk-perl tutorial and I also know where to look up the API.

The subject is somewhat misleading: I *do* know how to create thumbnails et al., my problem is: my application freezes when I'm generating the thumbs, and of course, when all thumbs are generated, *pling* the application is back. How can I avoid this, and maybe use a Gtk2::ProgressBar to indicate that thumbs are being generated.
Or even better: how can update/redraw my application to show thumbs when they're being generated? So that you seem them appearing one at a time.

Ideas, hints, ... everything will be appreciated ;-)

Thanks!!

ugly try-out code for displaying the thumbs

for my $image (@images) {
        last if $total_count++ == 55;
        if(not $count){
            $thumb_line = Gtk2::HBox->new(FALSE,1);
            $thumb_page->pack_start($thumb_line,FALSE,FALSE,5);
        }

        print "Thumbing ". $image->name."\n";
        my $pixbuf = Gtk2::Gdk::Pixbuf->new_from_file ($image->name);
        my ($width,$height) = ($pixbuf->get_width, $pixbuf->get_height
+);
        my ($scale_width,$scale_height) = $width > $height ? (80,70) :
+ (70,80);
        my $new_pixbuf = $pixbuf->scale_simple($scale_width,$scale_hei
+ght,'GDK_INTERP_BILINEAR');
        
        my $event_box = Gtk2::EventBox->new;
        $thumb_line->add($event_box);
        $event_box->show;
        
        my $image_widget = Gtk2::Image->new();
        $image_widget->set_from_pixbuf($new_pixbuf);
        $image_widget->set_size_request(80,80);
        $image_widget->show;

        $event_box->add($image_widget);
        $event_box->signal_connect('button_press_event',\&image_clicke
+d_event, $image->name);
        $event_box->window->set_cursor(Gtk2::Gdk::Cursor->new('hand1')
+);

        $thumb_line->show;
        #$pbar->pulse();
        #$pbar->show;
        $count = 0 unless ++$count < 10;
        $window->show;
    }
[download]

to ask a question is a moment of shame
to remain ignorant is a lifelong shame

Comment on Gtk2-perl: Create thumbnail pages Download Code

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Re: Gtk2-perl: Create thumbnail pages by phenom (Chaplain) on Aug 26, 2005 at 11:11 UTC
Try changing your code to: `for my $image (@images) { Gtk2->main_iteration while Gtk2->events_pending;` [download] I had the same problem too. (see phenom's scratchpad).	[reply] [d/l]
Re^2: Gtk2-perl: Create thumbnail pages by insaniac (Friar) on Aug 26, 2005 at 11:19 UTC
Ah thanks a lot! I can see my progressbar progressing :-D and i think that with this line, i can also construct the code to show the thumbs one at a time... great great, thanks again dude! to ask a question is a moment of shame to remain ignorant is a lifelong shame	[reply]