PyGTK/Hello World Tutorial

From OLPC
< PyGTK
Revision as of 19:17, 17 January 2008 by Crazy-chris (talk | contribs) (how to install)
Jump to navigation Jump to search

Welcome! This is a guide for how to create a simple PyGTK Activitiy.

About PyGTK

PyGTK is a framework to create a user interface with python. It's quick, easy and very good documented.


Getting started

Please start with this first steps:

  1. Make yourself familiar with PyGTK and write few demo applications
  2. Use Glade (or Gazpacho) to design an user interface, and use that in an application. This step is optional, but recommendet.

At this point we assume that you made at least one "hello-world" application with pygtk :)

The source codes from this examples are downloadable here:


Basic Activity Structure

This is a quite minimal list of files and directories for an Activity. You can use this code as a blueprint for your projects, basically changing gtktest to your Activity's name.


gtktest.activity/

This is the Activity's base directory.


gtktest.activity/MANIFEST

This text-file contains the structure of the Activity. Automatically created by setup.py. In our example: 

gtktest.activity/
gtktest.activity/MANIFEST
gtktest.activity/setup.py
gtktest.activity/activity/
gtktest.activity/activity/activity-gtktest.svg
gtktest.activity/activity/activity.info
gtktest.activity/activity.py
gtktest.activity/gtktest.py


gtktest.activity/setup.py

This is a script which creates the MANIFEST and zipps everything into gtktest.xo. 

#!/usr/bin/env python
try:
	from sugar.activity import bundlebuilder
	bundlebuilder.start("gtktest")
except ImportError:
	import os
	os.system("find ./ | sed 's,^./,gtktest.activity/,g' > MANIFEST")
	os.system('rm gtktest.xo')
	os.chdir('..')
	os.system('zip -r gtktest.xo gtktest.activity')
	os.system('mv gtktest.xo ./gtktest.activity')
	os.chdir('gtktest.activity')

gtktest.activity/activity/

This directory contains informations for sugar.


gtktest.activity/activity/activity-gtktest.svg

A .svg image for our Activity (svg's @ freedesktop.org).


gtktest.activity/activity/activity.info

This file contains informations for sugar about our Activity. 

[Activity]
name = gtktest
service_name = org.laptop.gtktest
class = activity.gtktestActivity
icon = activity-gtktest
activity_version = 1
show_launcher = yes


gtktest.activity/activity.py

This file is the core of the Activity, which loads the toolbar and window, attaches a GTK Widget to itself, and imports the Activity's source code source code from gtktest.py. This structure has a few advantages:

  1. No need to change activity.py for any code updates
  2. Run gtktest.py as standalone or imported from activity.py
# Load GTK
import gtk

# Load our own source code from gtktest.py
# There you can find the main class gtktest()
from gtktest import gtktest

# Load sugar libraries
from sugar.activity import activity  

class gtktestActivity(activity.Activity):
	def __init__(self, handle):
		activity.Activity.__init__(self, handle)
		self._name = handle

		# Set title for our Activity
		self.set_title('gtk test')

		# Attach sugar toolbox (Share, ...)
		toolbox = activity.ActivityToolbox(self)
		self.set_toolbox(toolbox)
		toolbox.show()

		# Create the main container
		self._main_view = gtk.VBox()

		# Import our class gtktest():

		# Step 1: Load class, which creates gtktest.widget
		self.gtktest = gtktest()

		# Step 2: Remove the widget's parent
		if self.gtktest.widget.parent:
			self.gtktest.widget.parent.remove(self.gtktest.widget)
 
		# Step 3: We attach that widget to our window
		self._main_view.pack_start(self.gtktest.widget)

		# Display everything
		self.gtktest.widget.show()
		self._main_view.show()
		self.set_canvas(self._main_view)
		self.show_all()

Creating the interface

We recommend, creating an interface with a ui designer like glade or gazpacho, but understanding the structure is easier using PyGTK.


using PyGTK

We only need to add one file: gtktest.py. Download full example: gtktest.xo


gtktest.activity/gtktest.py

This is the source code of the Activity. 

#! /usr/bin/env python

# Pango is a library for rendering internationalized texts
import pango

import gtk

# We don't yet need glade
# import gtk.glade

class gtktest:
	def __init__(self):
		# Create a GTK Label
		label = gtk.Label("Hello World")

		# self.widget will be attached to the Activity
		# This can be any GTK widget except a window
		self.widget = label


using Glade

Example: 3 Buttons and one label. Download Full Example: gtktest-glade.xo

Glade is a User Interface Designer, with it you can rapidly design user interfaces and use them with PyGTK (Getting started). In our example, the glade xml is saved in gtktest.glade.

gtktest.activity/gtktest.py

#! /usr/bin/env python
# Pango is a library for rendering internationalized texts
import pango

import gtk
import gtk.glade

class gtktest:
	def __init__(self, runaslib=True):
		# Load Glade XML
		self.xml = gtk.glade.XML("gtktest.glade")
		
		# Get Window
		self.w = self.xml.get_widget('window1')
		self.w.connect("delete_event", gtk.main_quit)
		
		# Get Windows child
		self.w_child = self.w.get_child()
		
		# Get our Label
		self.label = self.xml.get_widget('label1')
		
		# Connect functions to Buttons
		b1 = self.xml.get_widget('quitButton')
		b1.connect('clicked', self.on_btn_quit)

		b2 = self.xml.get_widget('helloButton')
		b2.connect('clicked', self.on_btn_hello)

		b3 = self.xml.get_widget('cleanButton')
		b3.connect('clicked', self.on_btn_clean)

		# self.widget will be attached to the Activity
		# This can be any GTK widget except a window
		self.widget = self.w_child

		if not runaslib:
			self.w.show_all()
			gtk.main()

	def on_btn_hello(self, *args):
		self.label.set_markup("Hello\nWorld!")

	def on_btn_clean(self, *args):
		self.label.set_markup("Hello")

	def on_btn_quit(self, *args):
		gtk.main_quit()
				
if __name__ == '__main__':
	gtktest(False)


gtktest.activity/gtktest.glade

This file is the XML of the interface, created using Glade: 

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE glade-interface SYSTEM "glade-2.0.dtd">
<glade-interface>
  <widget class="GtkWindow" id="window1">
    <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
    <child>
      <widget class="GtkVBox" id="vbox1">
        <property name="visible">True</property>
        <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
        <child>
          <widget class="GtkLabel" id="label1">
            <property name="height_request">160</property>
            <property name="visible">True</property>
            <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
            <property name="label" translatable="yes"><span font_desc="40">Hello</span></property>
            <property name="use_markup">True</property>
          </widget>
        </child>
        <child>
          <widget class="GtkHButtonBox" id="hbuttonbox1">
            <property name="visible">True</property>
            <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
            <property name="border_width">10</property>
            <property name="spacing">10</property>
            <child>
              <widget class="GtkButton" id="helloButton">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="receives_default">True</property>
                <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
                <property name="label" translatable="yes">Who?</property>
                <property name="response_id">0</property>
              </widget>
            </child>
            <child>
              <widget class="GtkButton" id="cleanButton">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="receives_default">True</property>
                <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
                <property name="label" translatable="yes">Clean Up!</property>
                <property name="response_id">0</property>
              </widget>
              <packing>
                <property name="position">1</property>
              </packing>
            </child>
            <child>
              <widget class="GtkButton" id="quitButton">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="receives_default">True</property>
                <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
                <property name="label" translatable="yes">gtk-quit</property>
                <property name="use_stock">True</property>
                <property name="response_id">0</property>
              </widget>
              <packing>
                <property name="position">2</property>
              </packing>
            </child>
          </widget>
          <packing>
            <property name="position">1</property>
          </packing>
        </child>
      </widget>
    </child>
  </widget>
</glade-interface>

Installation & Usage

  • Run setup.py to create the content bundle
  • Copy gtktest.xo to your xo/emu (eg. 'scp gtktest.xo olpc@192.168.0.11:/home/olpc')
  • Install the bundle with Xo-get:
./xo-get.py install gtktest.xo
  • Then you can start the Activity from the Home-Menu
  • Remove the Activity:
./xo-get.py remove gtktest.xo


Support

Questions, feedback, or whatever: Talk:PyGTK/Hello_World_Tutorial

Feel free to edit this page and to add yourself to the contributors list.


Version Information

Created: January 2008, Vienna

Contributors


Last update: Crazy-chris 12:49, 17 January 2008 (EST)

Retrieved from "http://wiki.laptop.org/mediawiki/index.php?title=PyGTK/Hello_World_Tutorial&oldid=98294"