How do I update widgets in the window and add new widgets to the window in PyGObject? - gtk

Question

I have a window set up with a few widgets but I want those widgets' information to be updated after some user input (e.g. button click). Also, I want an event handler to be able to add a new widget to the window.
I have attached an attempt at the below simple version of my question. Obviously it does not work though.
import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gdk, Gtk
class Button(Gtk.Box):
def __init__(self, message, label, window_grid):
Gtk.Box.__init__(self, spacing=6)
self.set_border_width(10)
self.label = label
self.window_grid = window_grid
button = Gtk.Button.new_with_label(message)
button.connect("clicked", self.on_click)
self.pack_start(button, True, True, 0)
def on_click(self, widget):
# Change/update a label in the window_grid
self.label = LabelBox("Changed the label")
self.label.queue_draw()
# Add a new label to the window_grid
new_label = LabelBox("New label")
self.window_grid.attach(new_label, 0, 2, 1, 1)
class LabelBox(Gtk.Box):
def __init__(self, message):
Gtk.Box.__init__(self, spacing=6)
self.set_border_width(10)
label = Gtk.Label(message)
self.pack_start(label, True, True, 0)
win = Gtk.Window()
window_grid = Gtk.Grid()
label = LabelBox("This is a label")
button = Button("Test", label, window_grid)
window_grid.attach(label, 0, 0, 1, 1)
window_grid.attach(button, 0, 1, 2, 2)
win.add(window_grid)
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()

Answer 1

Your code structure is poorly formatted. This code worked for me:
import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk
import sys
class GUI:
def __init__(self):
self.win = Gtk.Window()
self.window_grid = Gtk.Grid()
box = Gtk.Box()
button = Gtk.Button.new_with_label("Test")
button.connect("clicked", self.on_click)
self.label = Gtk.Label("This is a label")
self.window_grid.attach(self.label, 0, 0, 1, 1)
self.window_grid.attach(button, 0, 1, 2, 2)
self.win.add(self.window_grid)
self.win.connect("delete-event", Gtk.main_quit)
self.win.show_all()
def on_click(self, widget):
# Change/update a label in the window_grid
self.label.set_label('Label changed')
label = Gtk.Label("Another label")
self.window_grid.attach(label, 2, 1, 2, 2)
self.win.show_all()
def main():
app = GUI()
Gtk.main()
if __name__ == "__main__":
sys.exit(main())
Also keep #andlabs comment in mind, widgets are hidden by default.

Answer 2

As already said, your code logic ain't good. You must try to understand how to design your applications. Anyway, I've managed to get your code working to fit your question:
import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk
class Button(Gtk.Box):
def __init__(self, message, label, window_grid):
Gtk.Box.__init__(self, spacing=6)
self.set_border_width(10)
self.label = label
self.window_grid = window_grid
button = Gtk.Button.new_with_label(message)
button.connect("clicked", self.on_click)
self.pack_start(button, True, True, 0)
def on_click(self, widget):
# Change/update a label in the window_grid
self.label.label.set_text("Changed the lable")
# Add a new label to the window_grid
new_label = LabelBox("New label")
self.window_grid.attach(new_label, 0, 2, 1, 1)
new_label.show_all()
class LabelBox(Gtk.Box):
def __init__(self, message):
Gtk.Box.__init__(self, spacing=6)
self.set_border_width(10)
self.label = Gtk.Label(message)
self.pack_start(self.label, True, True, 0)
win = Gtk.Window()
window_grid = Gtk.Grid()
label = LabelBox("This is a label")
button = Button("Test", label, window_grid)
window_grid.attach(label, 0, 0, 1, 1)
window_grid.attach(button, 0, 1, 1, 1)
win.add(window_grid)
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()
Compare it to yours to see the mistakes you've made. There was no need to wrap the label and the button inside GtkBox.