ProgressBar (Python)

Code utilisé pour générer cet exemple

from gi.repository import GLib
from gi.repository import Gtk
import sys


class MyWindow(Gtk.ApplicationWindow):
    # a window

    def __init__(self, app):
        Gtk.Window.__init__(self, title="ProgressBar Example", application=app)
        self.set_default_size(220, 20)

        # a progressbar
        self.progress_bar = Gtk.ProgressBar()
        # add the progressbar to the window
        self.add(self.progress_bar)

        # the method self.pulse is called each 100 milliseconds
        # and self.source_id is set to be the ID of the event source
        # (i.e. the bar changes position every 100 milliseconds)
        self.source_id = GLib.timeout_add(100, self.pulse)

    # event handler
    # any signal from the keyboard controls if the progressbar stops/starts
    def do_key_press_event(self, event):
        # if the progressbar has been stopped (therefore source_id == 0 - see
        # "else" below), turn it back on
        if (self.source_id == 0):
            self.source_id = GLib.timeout_add(100, self.pulse)
        # if the bar is moving, remove the source with the ID of source_id
        # from the main context (stop the bar) and set the source_id to 0
        else:
            GLib.source_remove(self.source_id)
            self.source_id = 0
        # stop the signal emission
        return True

    # source function
    # the progressbar is in "activity mode" when this method is called
    def pulse(self):
        self.progress_bar.pulse()
        # call the function again
        return True


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)

Méthodes utiles pour un élément graphique barre de progression

Contrairement à pulse(), qui fait avancer ou reculer la barre, si nous voulons que notre barre de progression se remplisse par fractions (un nombre flottant float compris entre 0.0 et 1.0 inclus) toujours dans le même sens, nous utilisons la méthode set_fraction(fraction).

To set a text and show it (superimposed over the bar) use set_text("text") and set_show_text(True). If a text is not set and set_show_text(True) the text will be the percentage of the work that has been completed.