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Full Discussion: perl/Gtk2: issue with initializing Gtk2
Top Forums Programming perl/Gtk2: issue with initializing Gtk2 Post 302408207 by bigearsbilly on Sunday 28th of March 2010 05:39:51 PM
Old 03-28-2010
you may find it easier to use Glade to design your GUI
and then
use Gtk2::GladeXML;
to read the glade file.

that's what I do.
though gtk is a world of hurt.
terrible documentation, esp. for perl.
 

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LEARN ABOUT DEBIAN

gtk2::gladexml::simple

Gtk2::GladeXML::Simple(3pm)				User Contributed Perl Documentation			       Gtk2::GladeXML::Simple(3pm)

NAME

       Gtk2::GladeXML::Simple - A clean object-oriented interface to Gtk2::GladeXML

SYNOPSIS

	  package MyApp;
	  use base qw( Gtk2::GladeXML::Simple );

	  sub new {
	     my $class = shift;
	     my $self = $class->SUPER::new( $gladefile );
	     return $self;
	  }

	  ...

	  # Signal handlers are methods of your class
	  sub on_button_clicked {
	     my $self = shift;
	     # You have access to your widgets directly
	     # or using $self->get_widget( widget_name )
	     my $button = $self->{button1};
	  }

DESCRIPTION

       Gtk2::GladeXML::Simple is a module that provides a clean and easy interface for Gnome/Gtk2 and Glade applications using an object-oriented
       syntax. You just make Gtk2::GladeXML::Simple your application's base class, have your "new" call "SUPER::new", and the module will do the
       tedious and dirty work for you.

       Gtk2::GladeXML::Simple offers:

       o   Signal handler callbacks as methods of your class.

	      sub on_button1_clicked {
		 my $self = shift; # $self always received as first parameter
		 ...
		 # do anything you want in a OO fashioned way
	      }

       o   Autoconnection of signal handlers.

       o   Autocalling of creation functions for custom widgets.

       o   Access to the widgets as instance attributes.

	      my $btn = $self->{button1}; # fetch widgets as instance attributes by their names
	      my $window = $self->{main_window};
	      my $custom = $self->{custom_widget};

METHODS

       This class provides the following public methods:

       new( $gladefile [, $root, $domain ] );
	   This method creates a new object of your subclass of Gtk2::GladeXML::Simple.  The $gladefile parameter is the name of the file created
	   by the Glade Visual Editor.	The $root is an optional parameter that tells "libglade" the name of the widget to start building from.
	   The optional $domain parameter that specifies the translation domain for the glade xml file ( undef by default ).

       glade_object
	   This method returns the Gtk2::GladeXML object in play.

       get_widget( $widget_name )
	   Returns the widget with given name. Same as calling $self->{$widget_name}.

       get_widgets
	   Returns a list with all the widgets in the glade file.

       run Call this method in order to run your application. If you need another event loop rather than the Gtk one, override run in your class
	   with your event loop (for example the GStreamer event loop).

EXTENDED EXAMPLE

       This example shows the usage of the module by creating a small Yahoo search engine using WWW::Search::Yahoo.

	  package YahooApp;

	  use strict;
	  use warnings;
	  use Gtk2 '-init';
	  use Gtk2::Html2; #not part of the Gtk2 core widgets
	  use Gtk2::GladeXML::Simple;
	  use WWW::Search;

	  use base qw( Gtk2::GladeXML::Simple );

	  my $header =<<HEADER;
	  <html>
	  <meta HTTP-EQUIV="content-type" CONTENT="text/html; charset=UTF-8">
	  <header><title>Yahoo Gtk2 App</title>
	  <style type="text/css">
	  .title {font-family: Georgia; color: blue; font-size: 13px}
	  .description {padding-left: 3px; font-family: Georgia; font-size:10px}
	  .url {padding-left: 3px; font-family: Georgia; font-size:10px; color: green}
	  </style>
	  </head>
	  <body>
	  <h2 style="font-family: Georgia, Arial; font-weight: bold">
	  Found:
	  </h2>
	  HEADER

	  my $footer =<<FOOTER;
	  </body>
	  </html>
	  FOOTER

	  sub new {
	      my $class = shift;
	      #Calling our super class constructor
	      my $self = $class->SUPER::new( 'yahoo.glade' );
	      #Initialize the search engine
	      $self->{_yahoo} = WWW::Search->new( 'Yahoo' );
	      return $self;
	  }

	  sub do_search {
	      my $self = shift;
	      $self->{_yahoo}->native_query( shift );
	      my $buf = $header;
	      for( 1..10 ) {
		  my $rv = $self->{_yahoo}->next_result || last;
		  $buf .= qq{<p><div class="title">} . $rv->title;
		  $buf .= qq{</div><br /><div class="description">} . $rv->description;
		  $buf .= qq{</div><br /><div class="url">} . $rv->url . q{</div></p><br />};
	      }
	      $buf .= $footer;
	      $self->{buf} = $buf;
	  }

	  ### Signal handlers, now they're methods of the class ###
	  sub on_Clear_clicked {
	      my $self = shift;
	      my $html = $self->{custom1}; #fetch widgets by their names
	      $html->{document}->clear;
	      my $statusbar = $self->{statusbar1}; #another widget
	      $statusbar->pop( $statusbar->get_context_id( "Yahoo" ) );
	  }

	  sub on_Search_clicked {
	      my $self = shift;
	      my $text = $self->{text_entry}->get_text;
	      return unless $text ne '';
	      my $statusbar = $self->{statusbar1};
	      $statusbar->push( $statusbar->get_context_id( "Yahoo" ), "Searching for: $text" );
	      $self->do_search( $text );
	      my $html = $self->{custom1};
	      $html->{document}->clear;
	      $html->{document}->open_stream( "text/html" );
	      $html->{document}->write_stream( $self->{buf} );
	      $html->{document}->close_stream;
	  }

	  ### Creation function for the custom widget, method of the class as well ###
	  sub create_htmlview {
	      my $self = shift;
	      my $view = Gtk2::Html2::View->new;
	      my $document = Gtk2::Html2::Document->new;
	      $view->set_document( $document );
	      $view->{document} = $document;
	      $view->show_all;
	      return $view;
	  }

	  sub gtk_main_quit { Gtk2->main_quit }

	  1;

	  package main;

	  YahooApp->new->run; #Go!

	  1;

       The yahoo.glade file needed for this example is in the examples directory, along with other example programs.

UTILITIES

   Rapid Application Development with gpsketcher
       The Gtk2::GladeXML::Simple distribution includes gpsketcher, a program that generates Perl code stubs from glade XML files. The code stubs
       include the basic framework for Gtk2::GladeXML::Simple interaction, method signatures, and everything that describes the application
       itself. Developers must fill in the code stubs to add the correct functionality to the application.

SEE ALSO

       Gtk2::GladeXML, Gtk2, gpsketcher

       The Libglade Reference Manual at <http://developer.gnome.org/doc/API/2.0/libglade/>

       The gtk2 API Reference at <http://developer.gnome.org/doc/API/2.0/gtk/index.html>

TODO

       Tests.

       More examples?

       Add Gtk2::GladeXML::Simple::new_from_buffer()?

       Support to I18N ( bindtextdomain )

AUTHOR

       Marco Antonio Manzo <marcoam@perl.org.mx>

       Special thanks in no order to Scott Arrington "muppet" <scott at asofyet dot org> who provided lots of great ideas to improve this module.
       Sandino "tigrux" Flores <tigrux at ximian dot com> who is the author of SimpleGladeApp and the main source of this module's core idea.
       Sean M. Burke <sburke at cpan dot org> and Rocco Caputo <rcaputo at cpan dot org> for constantly helping me with ideas and cleaning my POD.

COPYRIGHT AND LICENSE

       Copyright (C) 2005 by Marco Antonio Manzo

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.6 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.10.1							    2005-07-23					       Gtk2::GladeXML::Simple(3pm)
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