Ce ColorButton ouvre une boîte de dialogue pour sélectionner une couleur et affiche dans le terminal les valeurs RVB de la couleur sélectionnée.
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)
set_color(color), where the color is defined as in the example, sets the color of the ColorButton, which by default is black. get_color() returns the color.
In line 23 the "color-set" signal is connected to the callback function on_color_chosen() using widget.connect(signal, callback function). See for a more detailed explanation.
Dans cet exemple, les éléments suivants sont utilisés :
GtkColorButton
GtkColorChooser
RGBA Colors