This ColorButton launches a color selection dialog and prints in the terminal the RGB values of the color selected.
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.
In this sample we used the following:
GtkColorButton
GtkColorChooser
RGBA Colors