This ComboBox prints to the terminal your selection when you change it.
from gi.repository import Gtk
import sys
actions = [["Select", None],
["New", Gtk.STOCK_NEW],
["Open", Gtk.STOCK_OPEN],
["Save", Gtk.STOCK_SAVE]]
class MyWindow(Gtk.ApplicationWindow):
def __init__(self, app):
Gtk.Window.__init__(self, title="Welcome to GNOME", application=app)
self.set_default_size(200, -1)
self.set_border_width(10)
# the data in the model, of type string on two columns
listmodel = Gtk.ListStore(str, str)
# append the data
for i in range(len(actions)):
listmodel.append(actions[i])
# a combobox to see the data stored in the model
combobox = Gtk.ComboBox(model=listmodel)
# cellrenderers to render the data
renderer_pixbuf = Gtk.CellRendererPixbuf()
renderer_text = Gtk.CellRendererText()
# we pack the cell into the beginning of the combobox, allocating
# no more space than needed;
# first the image, then the text;
# note that it does not matter in which order they are in the model,
# the visualization is decided by the order of the cellrenderers
combobox.pack_start(renderer_pixbuf, False)
combobox.pack_start(renderer_text, False)
# associate a property of the cellrenderer to a column in the model
# used by the combobox
combobox.add_attribute(renderer_text, "text", 0)
combobox.add_attribute(renderer_pixbuf, "stock_id", 1)
# the first row is the active one at the beginning
combobox.set_active(0)
# connect the signal emitted when a row is selected to the callback
# function
combobox.connect("changed", self.on_changed)
# add the combobox to the window
self.add(combobox)
def on_changed(self, combo):
# if the row selected is not the first one, write on the terminal
# the value of the first column in the model
if combo.get_active() != 0:
print("You chose " + str(actions[combo.get_active()][0]) + "\n")
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)
The ComboBox widget is designed around a Model/View/Controller design: the Model stores the data; the View gets change notifications and displays the content of the model; the Controller, finally, changes the state of the model and notifies the view of these changes. For more information and for a list of useful methods for ComboBox see .
In line 45 the "changed"
signal is connected to the callback function on_changed()
using widget.connect(signal, callback function)
. See for a more detailed explanation.
Neste exemplo empregaremos o seguinte:
GtkComboBox
GtkListStore
GtkCellRendererText
GtkCellRendererPixbuf
Stock Items
pygobject - Python bindings for GObject Introspection