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A newbie's e book to using pyGTK and Glade

The beauty of pyGTK and Glade is that they have unfolded pass-platform, expert-excellent GUI construction to these of us who'd reasonably be doing different things but who still want a GUI on appropriate of it all. no longer simplest does pyGTK permit neophytes to create extraordinary GUIs, it additionally makes it possible for professionals to create flexible, dynamic and robust consumer interfaces faster than ever before. in case you've ever desired to create a brief person interface that looks decent devoid of loads of work, and you do not have any GUI adventure, examine on.

this article is the direct influence of a studying procedure that befell while programming Immunity CANVAS (www.immunitysec.com/CANVAS). an awful lot of what changed into realized while constructing the GUI from scratch turned into put in the pyGTK FAQ, found at www.async.com.br/faq/pygtk/index.py?req=index. an additional URL you no doubt could be the usage of an awful lot if you delve deeply into pyGTK is the documentation at www.gnome.org/~james/pygtk-docs. it is fair to assert that for a small enterprise, the usage of pyGTK over different GUI development environments, corresponding to native C, is a aggressive advantage. with a bit of luck, after reading this text, everybody should still be in a position to put together a GUI the use of Python, the easiest of all languages to learn.

As a metric, the CANVAS GUI became written from scratch, in about two weeks, with no prior knowledge of pyGTK. It then changed into ported from GTK v1 to GTK v2 (extra on that later) in a day, and it's now deployed to each Microsoft windows and Linux shoppers.

The move-Platform Nature of pyGTK

In a perfect world, you not ever would should enhance for the rest but Linux operating your favorite distribution. within the real world, you need to help a couple of types of Linux, windows, UNIX or anything else your consumers want. selecting a GUI toolkit depends on what's smartly supported in your shoppers' systems. at the moment, identifying Python as your building device in any new exercise is 2d nature if velocity of building is extra of a requirement than runtime pace. This aggregate leads you to choose between right here options for Python GUI development: wxPython, Tkinter, pyGTK and Python/Qt.

preserving in mind that i am not knowledgeable GUI developer, here are my emotions on why one should selected pyGTK. wxPython has come a protracted way and presents beautiful interfaces however is complicated to use and get working, certainly for a beginner. now not to mention, it requires both Linux and windows clients to download and installation a big binary equipment. Qt, youngsters free for Linux, requires a license to be distributed for home windows. This probably is prohibitive for many small organizations who wish to distribute on varied platforms.

Tkinter is the first Python GUI development equipment and is obtainable with almost each Python distribution. It appears gruesome, notwithstanding, and requires you to embed Tk into your Python applications, which feels like going backward. For a newbie, you really wish to cut up the GUI from the application as a great deal as viable. That means, should you edit the GUI, you do not need to exchange a bunch of issues in your utility or integrate any adjustments into your application.

For these motives by myself, pyGTK could be your alternative. It neatly splits the utility from the GUI. the usage of libglade, the GUI itself is held as an XML file for you to proceed to edit, shop distinctive versions of or some thing else you need, because it isn't built-in together with your utility code. in addition, using Glade as a GUI builder allows you to create software interfaces promptly—so right now that if diverse consumers want dissimilar GUIs you might support all of them without difficulty.

edition issues with GTK and pyGTK

Two leading flavors of GTK are available within the wild, GTK versions 1 and 2. therefore, at the start of a GUI-building project, you should make some decisions about what to increase and hold. It is likely that Glade v1 got here installed for your machine. You may also have to down load Glade v2 or set up the building applications for GTK to compile the GTK v2 libglade. believe me, it is value the trouble. GTK v2 presents several benefits, together with a nicer average look, installers for windows with Python 2.2 and accessibility extensions that allow functions to be customized for blind clients. in addition, version 2 comes put in on lots of the newest distributions, despite the fact you nonetheless could need to deploy building RPMs or the latest pyGTK package.

GTK v2 and hence pyGTK v2 offer a number of, a bit greater complicated widgets (Views). in the arms of a mighty GUI master, they effect in staggering applications, but they in reality confuse freshmen. although, a few code recipes suggest you can deal with them as you may their counterparts in GTK v1, when you learn how to use them.

for instance, after setting up the entire GUI for CANVAS in GTK v1, I needed to go lower back and redevelop it (which took precisely sooner or later) in GTK v2. assist become lacking for GTK v1 in my purchasers' Linux packing containers, but installing GTK v2 was effortless satisfactory. The leading exception is Ximian computer, which makes pyGTK and GTK v1 handy to install. So, in case your complete client base is running that, you may need to dwell with GTK v1. One thing to keep in mind though—a Python script is available for converting tasks from Glade v1 to Glade v2, but not vice versa. So if you are going to do each, advance it first in Glade v1, convert it after which reconcile any transformations.

An Introduction to Glade v2

The idea in the back of using Glade and libglade is it wastes time to create your GUI the use of code. Sitting down and telling the Python interpreter the place each widget goes, what colour it is and what the defaults are is a huge time sink. anybody who's programmed in Tcl/Tk has spent days doing this. not most effective that, but changing a GUI created with code can be a enormous accomplishing at times. With Glade and libglade, as a substitute of growing code, you create XML information and code links to these data wherever a button or an entry field or an output textual content buffer is determined.

To delivery, you want Glade v2 if you won't have it already. although you do, you might also desire the latest edition of it. Downloading and setting up Glade v2 should be handy satisfactory once you have GTK v2 building applications (the -devel RPMs) put in. however, for most individuals new to GUI building, the starting window for Glade is intimidatingly clean.

To start your software, click the Window Icon. Now, make sure you have a large blank window for your reveal (figure 1).

determine 1. The pass-hatched area in the starting window is a place to put an extra widget.

The critical element to find out about GUI building is there are truly two kinds of objects: widgets, comparable to labels and entry bins and different issues you can see, and containers for these widgets. surely, you'll use one in every of three sorts of containers, the vertical container, the horizontal box or the desk. To create complex layouts, its least difficult to nest these containers collectively in something order you want. as an example, click on on the horizontal container icon. Clicking on the hatched area in window1 inserts three more areas where which you can add widgets. Your new window1 may still appear to be determine 2.

figure 2. A primary three-pane vbox with the right pane chosen.

You now can choose any of these three areas and additional divide it with a vertical box. in case you do not like the consequences, you at all times can go again and delete, reduce and paste or trade the variety of bins from the homes menu (extra on that later).

determine 3. The properly pane has been cut up by means of a two-pane hbox, which is chosen.

which you could use these types of primitives to create very nearly any sort of layout. Now that they now have a starting layout, they will fill it with widgets that really do anything. in this case, i could fill them with a label, a text entry, a spinbutton and a button. at the beginning this appears relatively gruesome (figure four).

determine four. The initial window stuffed in with widgets.

be aware that GTK auto-adjusts the sizes of the comprehensive product when it's displayed, so everything is packed collectively as tightly as feasible. When the consumer drags the corner of the window, it's going to auto-extend as well. which you can alter these settings in the properties window (go to the leading Glade window and click View→exhibit properties). The properties window changes distinct values for distinct kinds of widgets. If the spinbutton is focused, as an instance, they see the options proven in figure 5.

figure 5. The Glade interface for altering a widget's residences is custom-made for each class of widget.

by means of changing the cost choice, they can alternate what the spinbutton defaults to when displayed. additionally important is to change the Max value. a standard mistake is to exchange the cost to whatever high but neglect the Max, which causes the spinbutton originally to screen the default however then revert to the Max price when it's modified, complicated the consumer. In their case, we're going to use the spinbutton as a TCP port, so i'll set it to 65535, the minimum to 1 and the default to eighty.

Then, focal point on the label1 and change it to examine Host:. by clicking on window1 in general Glade window, which you can focal point on the entire window, enabling you to trade its residences as smartly. You can also do this by bringing up the widget tree window and clicking on window1. altering the name to serverinfo and the title to Server data units the titlebar and the internal Glade top-degree widget identify as it should be for this application.

if you go to the widget tree view and click on on the hbox1, which you could raise the spacing between Host: and the text-entry box. This may make it appear a little nicer. Their complete GUI appears like figure 6.

determine 6. The GUI in Glade doesn't appear precisely love it does when rendered, so don't worry about the measurement of the Host: area.

invariably, this may take best a couple of minutes to place collectively. After a little bit of observe you're going to locate that placing together even essentially the most complicated GUIs the usage of Glade can also be achieved in minutes. compare that to the time it takes to classification in all these Tk commands manually to do the identical issue.

This GUI, of direction, doesn't do anything else yet. They deserve to write the Python code that loads the .glade file and does the specific work. in reality, I tend to write two Python files for every Glade-driven assignment. One file handles the GUI, and the different file would not know anything about that GUI. That way, porting from GTK v1 to GTK v2 and even to one other GUI toolkit is easy.

creating the Python application

First, they deserve to take care of any advantage edition skew. i exploit here code, besides the fact that children a number of other entries outlined in the FAQ do identical issues:

#!/usr/bin/env python import sys are attempting: import pygtk #inform pyGTK, if viable, that they want GTKv2 pygtk.require("2.0") except: #Some distributions include GTK2, however no longer pyGTK move try: import gtk import gtk.glade apart from: print "You need to install pyGTK or GTKv2 ", print "or set your PYTHONPATH as it should be." print "are attempting: export PYTHONPATH=", print "/usr/local/lib/python2.2/web site-applications/" sys.exit(1) #now they have each gtk and gtk.glade imported #additionally, they recognize they are working GTK v2

Now are going to create a GUI class referred to as appGUI. before they do that, notwithstanding, they need to open button1's residences and add a signal. To do this, click on the three dots, scroll to clicked, opt for it after which click Add. you should definitely end up with anything like figure 7.

figure 7. After adding the experience (sign) Handler

With this in place, the signal_autoconnect motives any click on of the button to name one in all their capabilities (button1_clicked). which you can see the other potential indicators to be dealt with in that checklist as neatly. each widget might also have distinct potential alerts. as an example, capturing a textual content-modified signal on a textual content-entry widget may well be valuable, however a button under no circumstances adjustments since it's now not editable.

Initializing the utility and starting gtk.mainloop() receives the ball rolling. distinctive event handlers need to have different numbers of arguments. The clicked adventure handler receives just one argument, the widget that become clicked. while you're at it, add the destroy experience to the leading window, so the application exits if you happen to close the window. remember to retailer your Glade venture.

class appgui: def __init__(self): """ during this init they are going to display the leading serverinfo window """ gladefile="project1.glade" windowname="serverinfo" self.wTree=gtk.glade.XML (gladefile,windowname) # they only have two callbacks to register, however # you might register any number, or use a # particular class that automatically # registers all callbacks. in case you desired to move # an argument, you might use a tuple like this: # dic = { "on button1_clicked" : \ (self.button1_clicked, arg1,arg2) , ... dic = "on_button1_clicked" : \ self.button1_clicked, "on_serverinfo_destroy" : \ (gtk.mainquit) self.wTree.signal_autoconnect (dic) return #####CALLBACKS def button1_clicked(self,widget): print "button clicked" # they beginning the app like this... app=appgui() gtk.mainloop()

it's crucial to be certain, in case you put in pyGTK from source, that you set the PYTHONPATH ambiance variable to point to /usr/native/lib/python2.2/web site-packages/ so pyGTK may also be found accurately. also, make certain you copy project1.glade into your present listing. you'll want to become with something like determine eight in the event you run your new program. Clicking GO! should still produce a nifty button-clicked message in your terminal window.

figure eight. The initial Server info GUI

To make the software definitely do something exciting, you need to have some way to assess which host and which port to use. the following code fragment, put into the button1_clicked() feature, may still do the trick:

host=self.wTree.get_widget("entry1").get_text() port=int(self.wTree.get_widget( "spinbutton1").get_value()) if host=="": go backimport urllib page=urllib.urlopen( "https://killexams.com/entry-test-preparation+"/") data=web page.read() print data

Now when GO! is clicked, your software should go off to a remote web page, seize an internet web page and print the contents on the terminal window. you could spice it up via including more rows to the hbox and putting other widgets, like a menubar, into the software. You also can experiment with the use of a desk instead of nested hboxes and vboxes for design, which often creates nicer looking layouts with everything aligned.


You don't definitely need all that textual content going to the terminal, although, do you? it's seemingly you need it displayed in another widget or even in an additional window. To try this in GTK v2, use the TextView and TextBuffer widgets. GTK v1 had a straightforward-to-be aware widget referred to as, easily, GtkText.

Add a TextView to your Glade project and put the consequences in that window. you are going to note that a scrolledwindow is created to encapsulate it. Add the lines below to your init() to create a TextBuffer and attach it to your TextView. undoubtedly, probably the most benefits of the GTK v2 manner of doing things is the two distinct views can exhibit the identical buffer. You also may additionally are looking to go into the houses window for scrolledwindow1 and set the dimension to whatever thing better so you have a good view area:

self.logwindowview=self.wTree.get_widget("textview1") self.logwindow=gtk.TextBuffer(None) self.logwindowview.set_buffer(self.logwindow)

to your button1_clicked() feature, replace the print statement with:


Now, every time you click GO! the outcomes are displayed on your window. via dividing your leading window with a collection of vertical panes, that you could resize this window, in case you like (determine 9).

determine 9. Clicking GO! loads the net web page and displays it within the TextView.

TreeViews and Lists

in contrast to GTK v1, beneath GTK v2 a tree and a listing actually are the identical thing; the change is the form of store each of them uses. an additional crucial concept is the TreeIter, which is a datatype used to store a pointer to a specific row in a tree or record. It does not present any constructive methods itself, that is, you can't ++ it to step throughout the rows of a tree or listing. youngsters, it is handed into the TreeView strategies whenever you need to reference a specific location within the tree. So, for instance:

import gobject self.treeview=[2]self.wTree.get_widget("treeview1") self.treemodel=gtk.TreeStore(gobject.TYPE_STRING, gobject.TYPE_STRING) self.treeview.set_model(self.treemodel)

defines a tree model with two columns, each containing a string. the following code adds some titles to the desirable of the columns:

self.treeview.set_headers_visible(gtk.authentic) renderer=gtk.CellRendererText() column=gtk.TreeViewColumn("identify",renderer, textual content=0) column.set_resizable(gtk.real) self.treeview.append_column(column) renderer=gtk.CellRendererText() column=gtk.TreeViewColumn("Description",renderer, textual content=1) column.set_resizable(gtk.genuine) self.treeview.append_column(column) self.treeview.reveal()

You could use the following feature so as to add records manually to your tree:

def insert_row(model,parent, firstcolumn,secondcolumn): myiter=model.insert_after(parent,None) model.set_value(myiter,0,firstcolumn) model.set_value(myiter,1,secondcolumn) return myiter

right here's an instance that makes use of this characteristic. remember to add treeview1 to your glade file, save it and replica it to your local directory:

model=self.treemodel insert_row(model,None,'Helium', 'control existing Helium') syscallIter=insert_row(mannequin,None, 'Syscall Redirection', 'manage existing Syscall Proxy') insert_row(model,syscallIter,'Syscall-shell', 'Pop-up a syscall-shell')

The screenshot in figure 10 shows the consequences. I've replaced the TextView with a TreeView, as that you could see.

determine 10. An example TreeView with Two Columns

a list is achieved the identical manner, except you employ ListStore as a substitute of TreeStore. additionally, obviously you'll use ListStore.append() as a substitute of insert_after().

using Dialogs

A dialog differs from a traditional window in a single vital means—it returns a price. To create a dialog container, click on the dialog box button and name it. Then, to your code, render it with [3]gtk.glade.XML(gladefile,dialogboxname). Then name get_widget(dialogboxname) to get a address to that particular widget and phone its run() system. If the outcomes is gtk.RESPONSE_OK, the user clicked ok. If now not, the user closed the window or clicked Cancel. either means, that you could damage() the widget to make it disappear.

One capture when using dialog packing containers: if an exception occurs before you name smash() on the widget, the now unresponsive dialog container may hang round, perplexing your users. call widget.smash() appropriate after you get hold of the response and all of the facts you need from any entry boxes within the widget.

the use of input_add() and gtk.mainiteration() to deal with Sockets

Some day, you doubtless will write a pyGTK software that uses sockets. When doing so, be conscious that while your routine are being handled, the utility is never doing anything else. When ready on a socket.accept(), as an example, you are going to be stuck looking at an unresponsive application. as an alternative, use gtk.input_add() so as to add any sockets that may have examine movements to GTK's internal listing. This allows you to specify a callback to handle anything statistics is available in over the sockets.

One catch when doing this is you often wish to replace your home windows all the way through your experience, necessitating a name to gtk.mainiteration(). but if you name gtk.mainiteration() while within gtk.mainiteration(), the utility freezes. My solution for CANVAS became to wrap any calls to gtk.mainiteration() inside a check to make certain I wasn't recursing. I check for pending movements, like a socket accept(), any time I write a log message. My log function ends up looking like this:

def log(self,message,color): """ logs a message to the log window at the moment it just ignores the color argument """ message=message+"\n" self.logwindow.insert_at_cursor(message, len(message)) self.handlerdepth+=1 if self.handlerdepth==1 and \ gtk.events_pending(): gtk.mainiteration() self.handlerdepth-=1 return

moving a GUI from GTK v1 to GTK v2

The entry within the pyGTK FAQ on porting your utility from GTK v1 to GTK v2 is fitting more and more comprehensive. although, you should be privy to a number of complications you're going to face. most likely, all of your GtkText widgets deserve to get replaced with Gtk.TextView widgets. The corresponding code within the GUI also need to be changed to accommodate that stream. Likewise, any lists or trees you've got completed in GTK v1 need to be redone. What may additionally come as a shock is you additionally need to redo all dialog packing containers, remaking them in GTK v2 structure, which appears a great deal nicer.

additionally, a few syntax adjustments happened, corresponding to GDK relocating to gtk.gdk and libglade moving to gtk.glade. For essentially the most half, these are elementary search and replaces. Use GtkText.insert_defaults in its place of GtkTextBuffer.insert_at_cursor() and radiobutton.get_active() in its place of radiobutton.lively, for instance. you can convert your Glade v1 file right into a Glade v2 file the usage of the libglade distribution's Python script. This receives you started for your GUI, but you may need to load Glade v2 and do some reconfigurations before porting your code.

last Notes

  • don't forget which you could reduce and paste from the Glade widget tree. This could make a redecorate quick and painless.

  • Unset any possible positions within the houses window so your startup would not seem to be bizarre.

  • if in case you have a question you believe different individuals might too, add it to the pyGTK FAQ.

  • The GNOME IRC server has a beneficial #pygtk channel. I couldn't have written CANVAS devoid of the aid of the individuals on the channel, principally James Henstridge. it be a tribute to the Open supply group that the predominant developers regularly can be found to reply newbie questions.

  • The complete demo code is attainable from ftp.linuxjournal.com/pub/lj/listings/issue113/6586.tgz.

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