Basic GTK3 Application

Here is a basic application written in Python and GTK3.

The script shows minimal Python codes that are required for a GTK3 application. A button and a label are included to demonstrate how button event is handled.

Source Code

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#!/usr/bin/python

from gi.repository import Gtk

class MyWindow(Gtk.Window):

    def __init__(self):
        Gtk.Window.__init__(self, title="Hello World")
        self.connect("delete-event", Gtk.main_quit)
        self.set_default_geometry(width=400, height=200)
        mBox = Gtk.VBox(2)
        mButt = Gtk.Button(label="Click Here")
        mButt.connect("clicked", self.on_button_clicked)
        mBox.pack_start(mButt,True,True,2)
        self.label = Gtk.Label("Message")
        mBox.pack_start(self.label,True,True,2)
        self.add(mBox)

    def on_button_clicked(self, widget):
        print("Hello World")
        self.label.set_text("Hello World")

win = MyWindow()
win.show_all()
Gtk.main()