A simple label
from gi.repository import Gtk
import sys
class MyWindow(Gtk.ApplicationWindow):
# constructor for a Gtk.ApplicationWindow
def __init__(self, app):
Gtk.Window.__init__(self, title="Welcome to GNOME", application=app)
self.set_default_size(200, 100)
# create a label
label = Gtk.Label()
# set the text of the label
label.set_text("Hello GNOME!")
# add the label to the window
self.add(label)
class MyApplication(Gtk.Application):
def __init__(self):
Gtk.Application.__init__(self)
def do_activate(self):
win = MyWindow(self)
win.show_all()
def do_startup(self):
Gtk.Application.do_startup(self)
app = MyApplication()
exit_status = app.run(sys.argv)
sys.exit(exit_status)
Another way to obtain what we have in the example is to create the label as an instance of another class and add it to the instance of MyWindow
in the do_activate(self)
method:
The highlighted lines indicate code that is different from the previous snippet.
# a class to define a window
class MyWindow(Gtk.ApplicationWindow):
def __init__(self, app):
Gtk.Window.__init__(self, title="Welcome to GNOME", application=app)
self.set_default_size(200, 100)
# a class to define a label
class MyLabel(Gtk.Label):
def __init__(self):
Gtk.Label.__init__(self)
self.set_text("Hello GNOME!")
class MyApplication(Gtk.Application):
def __init__(self):
Gtk.Application.__init__(self)
def do_activate(self):
# create an instance of MyWindow
win = MyWindow(self)
# create an instance of MyLabel
label = MyLabel()
# and add it to the window
win.add(label)
# show the window and everything on it
win.show_all()
An explanation of how to work with strings in GTK+ can be found in .
set_line_wrap(True)
breaks lines if the text of the label exceeds the size of the widget.
set_justify(Gtk.Justification.LEFT)
(or Gtk.Justification.RIGHT, Gtk.Justification.CENTER, Gtk.Justification.FILL
) sets the alignment of the lines in the text of the label relative to each other. The method has no effect on a single-line label.
For decorated text we can use set_markup("text")
, where "text"
is a text in the Pango Markup Language. An example:
small, big, "
"bold, italic and even point to somewhere "
"on the internet.")]]>
In this sample we used the following:
GtkLabel
GtkWindow