Python Class Template example for GTK+ GUI Application built using Glade

This article contains a bare bone Python Class Template, an example class or a sample class to load GUI built using Glade. The class can launch the GUI application. You can add Python event code functions to handle GTK+ GUI signals of UI objects like GTKApplicationWindow, GTJKListbox, GTKButton, GTKLabel, etc.

This class assumes that you have built your GUI interface using Glade, and the Glade file name is “MyGUI.glade”. This class also assumes that you have linked UI events or signals to Python function names using the signals tab of each GUI object in Glade. In the signals tab of Glade you can enter names of Python functions for all GUI events that object can handle like key events, mouse events and other user action events.

Use the below class as a base template for your GUI application and build your complete GUI application quickly. All thanks to Glade and Python – GUI programming has never been so easy on Linux or Ubuntu systems.

import gi

#make sure you have latest GTK version
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk

class MyGUIApp:

    def __init__(self,glade_file):

        #Initialize the GTK Builder
        self.builder = Gtk.Builder()	

        #Load GUI from the Glade File
        self.builder.add_from_file(glade_file)

        #Link all GUI events specified in Glade to corresponding functions in this class
        self.builder.connect_signals(self)

    def launch(self):
        #assuming your main window in Glade has ID winMain
        window = self.builder.get_object("winMain")

        window.show_all()
        window.maximize()
        Gtk.main()

    #make sure you have set destroy signal to "onDestroy" in Glade for "winMain"
    #else this function will not be called on close event of main application window
    def onDestroy(self, *args):
        #quit the application on closing of main application window
        Gtk.main_quit()

    #Write additional functions below to handle other events or signals
    #The function names can be linked to specific GUI events in Glade itself in the signals tab of each GUI object in GladeCode language: Python (python)

You can initialize and launch the application as follows:

myapp = MyGuiApp("MyGUI.glade")
myapp.launch()Code language: JavaScript (javascript)