from gi.repository import Gtk

from gi.repository import Gdk

import sys

class MyWindow(Gtk.ApplicationWindow):

    def __init__(self, app):

        Gtk.Window.__init__(self, title="ColorButton", application=app)

        self.set_default_size(150, 50)

        self.set_border_width(10)

        # a colorbutton (which opens a dialogue window in

        # which we choose a color)

        self.button = Gtk.ColorButton()

        # with a default color (blue, in this instance)

        color = Gdk.RGBA()

        color.red = 0.0

        color.green = 0.0

        color.blue = 1.0

        color.alpha = 0.5

        self.button.set_rgba(color)

        # choosing a color in the dialogue window emits a signal

        self.button.connect("color-set", self.on_color_chosen)

        # a label

        label = Gtk.Label()

        label.set_text("Click to choose a color")

        # a grid to attach button and label

        grid = Gtk.Grid()

        grid.attach(self.button, 0, 0, 2, 1)

        grid.attach(label, 0, 1, 2, 1)

        self.add(grid)

    # if a new color is chosen, we print it as rgb(r,g,b) in the terminal

    def on_color_chosen(self, user_data):

        print("You chose the color: " + self.button.get_rgba().to_string())

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)