Re: GTK2 - Load updated image file into a frame

[zentara]

Hi,

To amplify on what Anonymous Monk said, here is how to do it. You do not want to rebuild the $hbox, only the image. I also cleaned up your code, you had many useless lines. The script below will cycle thru all jpg's in the script's directory for the demo. I improved on your use of "cat" to load the file, that code looked familiar to me, and is not very advanced. :-) The code below is much better, and it can be improved a bit, but it does show you the idea.

#!/usr/bin/perl -w
use Glib qw/TRUE FALSE/;
use Gtk2 '-init';
use strict;

# load all jpgs in directory for this demo
my @files = <*.jpg>;
#print "@files\n";

my $window = Gtk2::Window->new('toplevel');
$window->signal_connect(delete_event => sub { Gtk2->main_quit; return 
+FALSE; });
$window->set_title("Test set up");
$window->set_border_width(0);

# create your first image and pass it to $hbox
my $img1 = load_first_image();

my $hbox = &make_gui_frame($img1);

$window->add($hbox);

Glib::Timeout->add(1000, \&update_image);

$window->show;
Gtk2->main;

0;

sub load_first_image{

    my $file = $files[0];

    my $pixbuf = Gtk2::Gdk::Pixbuf->new_from_file_at_scale($file,300,3
+00,1);
    
    return Gtk2::Image->new_from_pixbuf($pixbuf);
}


sub update_image {
  
  # circular list of images just for demo
  push (@files,shift(@files));
  my $file = $files[0];

  my $pixbuf = Gtk2::Gdk::Pixbuf->new_from_file_at_scale($file,300,300
+,1);
    
  $img1->set_from_pixbuf ($pixbuf);
  
  $window->show_all();
  return 1;
}

sub make_gui_frame {

   my $img1 = shift;

## MAIN HBOX
    $hbox = Gtk2::HBox->new(FALSE, 20);
    
    my $frame = Gtk2::Frame->new('Data control');
    $frame->set_shadow_type ('out');

#method of Gtk2::Container
    $frame->set_border_width(5);

    my $box1 = Gtk2::VBox->new(FALSE, 10);
    my $box2 = Gtk2::VBox->new(FALSE, 10);
    $box2->set_border_width(10);
    $box1->pack_start($box2, TRUE, TRUE, 0);

    my $button = Gtk2::Button->new("close");
    $button->signal_connect(clicked => sub { Gtk2->main_quit; });

    $box2->pack_start($button, TRUE, TRUE, 0);
    $button->can_default(TRUE);

    $frame->add($box1);

    $hbox->pack_start($frame, FALSE, FALSE,0);

    $frame = Gtk2::Frame->new('Data output and Overlay');
    $frame->set_shadow_type ('out');
#method of Gtk2::Container
    $frame->set_border_width(5);

    my $vbox_image = Gtk2::VBox->new(FALSE, 10);

    $vbox_image->pack_start($img1,FALSE,FALSE,0);

    $frame->add($vbox_image);

    $hbox->pack_start($frame, FALSE, FALSE,0);

    $hbox->show_all();

    return $hbox;
}

[seoseoboyle]

That worked a treat. Thanks for you help. The line $window->show_all() in sub update_image() was not obvious from the documentation on the web. This would be a good example. Thanks again.