DZone Snippets: gtk code

Put mounted drives list into Glist

Tvrtko (Tvrtko) — Sat, 12 Apr 2008 13:22:02 GMT

Function that gets list of mounted drives from '/etc/fstab' and '/etc/mtab' files and puts data in the GList object (from GLib library) that can be further used in GTK.



#include 

#include 

#include 



GList * g_get_drives_list(GList * g) {

	FILE *fstab = NULL;

	struct mntent *part = NULL;

	gchar *mntp = NULL;

	

	if ((fstab = setmntent( "/etc/fstab", "r" )) != NULL) {

		while ((part = getmntent(fstab))  != NULL) {

			if((strcmp(part->mnt_type, "proc")) != 0 && (strcmp(part->mnt_type, "devpts")) != 0 

																					&& (strcmp(part->mnt_type, "swap")) != 0) {

				mntp = g_strdup(part->mnt_dir);

				g=g_list_append(g, mntp);

			}

		}

		endmntent(fstab);

	}

	

	if ((fstab = setmntent( "/etc/mtab", "r")) != NULL) {

		while ((part = getmntent(fstab)) != NULL) {

			if (part->mnt_type != NULL) {

				if((strcmp(part->mnt_type, "proc")) != 0 && (strcmp(part->mnt_type, "devpts")) != 0

						&& (strcmp(part->mnt_type, "swap")) != 0 && (strcmp(part->mnt_type, "sysfs")) != 0

						&& (strcmp(part->mnt_type, "tmpfs")) != 0 && (strcmp(part->mnt_type, "fuseblk")) != 0

						&& (strcmp(part->mnt_type, "securityfs")) != 0) {

					if((g_list_find_custom(g, part->mnt_dir, (GCompareFunc)strcmp)) == 0) {

						mntp=g_strdup(part->mnt_dir);

						g=g_list_append(g, mntp);

					}

				}

			}

		}

		endmntent(fstab);

	}

	return g;

}

A Glade 'Hello World' application

jrobertson (James Robertson) — Tue, 18 Mar 2008 19:29:06 GMT

- getting started - (Using Ubuntu Linux 7.10)
1) Installed glade-3,libglade2-ruby
2) Executed glade-3

- Within glade-3 -
1) Selected from the glade-3 top menu View -> Palette appearance -> Text beside icons
2) Created a window (Toplevels)
3) Created a button on the window (Control and Display)
3) With button selected, from the properties panel I selected the Signals tab and chose 'clicked', then for the Handler -> on_button1_clicked and pressed enter.
4) With window select, from the properties panel I select the Signals tab and chose GtkWidget->delete-event, then for the Handler I typed on_quit and pressed enter.

- Generating and editing the code

-- From the command line -
1) Typed ruby-glade-create-template helloworld3.glade > helloworld3.rb

-- From the file helloworld3.rb - (see helloworld3.rb and how it relates to helloworld3.glade)
1) Implemented the initialise window routine
2) Implemented the button event handler

- Running the application
1) From the command line I typed ruby helloworld3.rb
2) stretched the window to a comfortable dimension.
3) clicked the button and observed the Window title change to 'Hello World!'

file: helloworld3.glade



#!/usr/bin/env ruby

#

# This file is generated by ruby-glade-create-template 1.1.4.

#

require 'libglade2'



class Helloworld3Glade

  include GetText



  attr :glade

  

  def initialize(path_or_data, root = nil, domain = nil, localedir = nil, flag = GladeXML::FILE)

    bindtextdomain(domain, localedir, nil, "UTF-8")

    @glade = GladeXML.new(path_or_data, root, domain, localedir, flag) {|handler| method(handler)}

    @window1 = @glade.get_widget("window1") # hand coded

    @window1.show # hand coded      

  end

  

  def on_button1_clicked(widget)

    #puts "on_button1_clicked() is not implemented yet." # removed this code by hand

    @window1.title = 'Hello World!' # hand coded  

  end

  def on_quit(widget, arg0)

    #puts "on_quit() is not implemented yet." # removed this code by hand

    Gtk.main_quit # hand coded

  end

end



# Main program

if __FILE__ == $0

  # Set values as your own application. 

  PROG_PATH = "helloworld3.glade"

  PROG_NAME = "YOUR_APPLICATION_NAME"

  Helloworld3Glade.new(PROG_PATH, nil, PROG_NAME)

  Gtk.main

end

file: helloworld3.glade











  

    GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK

    

    

      

        True

        True

        True

        GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK

        button

        0

Python - Example Simple ImageView

whitetiger () — Sat, 09 Dec 2006 03:49:01 GMT



import pygtk; pygtk.require('2.0')

import gtk



class Image_Example(object):



	def pressButton(self, widget, data=None):

		print "Pressed"



	def delete_event(self, widget, event, data=None):

		print "delete event occured"



		return False



	def destroy(self, widget, data=None):

		gtk.main_quit()



	def __init__(self):

		self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)

		self.window.connect("delete_event", self.delete_event)

		self.window.connect("destroy", self.destroy)

		self.window.set_border_width(10)



		self.button = gtk.Button()

		self.button.connect("clicked", self.pressButton, None)

		self.button.connect_object("clicked", gtk.Widget.destroy, self.window)



		self.image = gtk.Image()

		self.image.set_from_file("/tmp/f27.jpg")

		self.image.show()



		self.button.add(self.image)

		self.window.add(self.button)

		self.button.show()

		self.window.show()



	def main(self):

		gtk.main()





if __name__ == '__main__':



	Image_Example().main()

C - Simple Example GTK

whitetiger () — Tue, 05 Dec 2006 16:50:54 GMT

// gcc file.c -o file.o `pkg-config --libs --cflags gtk+-2.0`



#include 

#include 



void displayUI()

{

	GtkWidget* mainWindow = gtk_window_new(GTK_WINDOW_TOPLEVEL);



	gtk_window_set_default_size(GTK_WINDOW(mainWindow), 400, 300);

	gtk_window_set_title(GTK_WINDOW(mainWindow), "GTK Simple Example");

	gtk_window_set_position(GTK_WINDOW(mainWindow), GTK_WIN_POS_CENTER_ALWAYS);



	gtk_signal_connect(GTK_OBJECT(mainWindow), "destroy", G_CALLBACK(gtk_main_quit), NULL);



	gtk_widget_show_all(mainWindow);

}



int main(int argc, char *argv[])

{

	gtk_init(&argc, &argv);



	displayUI();



	gtk_main();



	return EXIT_SUCCESS;

}

Python - change_color_entry

whitetiger () — Sat, 18 Mar 2006 16:10:03 GMT

// Cambia il colore di sfondo di una gtk.Entry, ma il discorso vale anche
// per la gtk.TextView...



import gtk



def change_color_entry(entry, color):

    entry.modify_base(gk.STATE_NORMAL, gtk.gdk.color_parse(color))

GtkEditable insert handler which filters certain characters

davidtrowbridge (David Trowbridge) — Mon, 27 Feb 2006 13:19:39 GMT

This is an example of a signal handler for GtkEditable::insert-text which filters out certain characters as the user types.



static void

insert_filtered (GtkEditable *entry, gchar *new_text, gint new_text_length, gint *position, gpointer data)

{

        gchar *clean_text;

        gint   i, j;



        clean_text = g_strndup (new_text, new_text_length);

        for (i = 0, j = 0; i < new_text_length; i++) {

                gchar c = new_text[i];

                if (c == '\t' || c == '\n' || c == '\r' || c == '(' ||

                    c == ')'  || c == '['  || c == ']'  || c == '<' ||

                    c == '>'  || c == '+'  || c == '\'' || c == '"')

                        continue;

                clean_text[j] = c;

                j++;

        }

        clean_text[j] = '\0';



        /* Call the default handler directly and stop the emission */

        g_signal_stop_emission_by_name (G_OBJECT (entry), "insert-text");

        if (clean_text[0] != '\0') {

                GtkEditableClass *klass;

                klass = GTK_EDITABLE_GET_CLASS (entry);

                klass->insert_text (entry, clean_text, j, position);

        }



        g_free (clean_text);

}

Example usage:



...

        GtkWidget *entry;



        entry = gtk_entry_new ();

        g_signal_connect (G_OBJECT (entry), "insert-text", G_CALLBACK (insert_filtered), NULL);

...

convert a PIL image to a GTK pixbuf

manatlan (manatlan) — Thu, 08 Sep 2005 01:59:05 GMT

free adaptation of http://slugathon.python-hosting.com/changeset/205



import gtk

import Image



def image2pixbuf(im):  

    file1 = StringIO.StringIO()  

    im.save(file1, "ppm")  

    contents = file1.getvalue()  

    file1.close()  

    loader = gtk.gdk.PixbufLoader("pnm")  

    loader.write(contents, len(contents))  

    pixbuf = loader.get_pixbuf()  

    loader.close()  

    return pixbuf

convert a GTK pixbuf to a PIL image

manatlan (manatlan) — Wed, 07 Sep 2005 19:11:04 GMT



import gtk

import Image



def pixbuf2Image(pb):

   width,height = pb.get_width(),pb.get_height()

   return Image.fromstring("RGB",(width,height),pb.get_pixels() )



pb = gtk.gdk.pixbuf_new_from_file( "p20050424_160333.jpg" )

im = pixbuf2Image(pb)

im.save("welldone.jpg", "JPEG",quality=80)

Using glade interface file in ruby-gnome2.

nohmad (Gyoung-Yoon Noh) — Mon, 04 Jul 2005 10:42:33 GMT



require 'gtk2'

require 'libglade2'



class SignalHandler

  def method_missing(method, *args)

    puts "#{method}: #{args}"

  end

end

sigmap = SignalHandler.new



Gtk.init

glade = GladeXML.new('hello.glade', nil, 'helloglade')

window = glade['main_window']

window.signal_connect("destroy") { Gtk.main_quit }

glade.signal_autoconnect_full do |source, target, signal, handler, data|

  source.signal_connect(signal) { sigmap.send(handler, data) }

end



window.show

Gtk.main

I did not know what file should I require. :(