I developed a small application by using GTK4 and Python3. ColumnView is used for showing column data. But adding data to Gio.ListStore model consumes high CPU.
Adding two column data takes about 0.04 seconds. Adding four column data takes about 0.08 seconds. And adding five column data takes about 0.098 seconds. Adding 10-15 columns blocks GUI. On the other hand, adding a few thousands of row works does not block the GUI.
Is there a way to reduce CPU load?
An example code:
import gi
gi.require_version('Gtk', '4.0')
from gi.repository import Gtk, Gio, GObject
class User(GObject.Object):
__gtype_name__ = 'User'
name = GObject.Property(type=str)
email = GObject.Property(type=str)
city = GObject.Property(type=str)
car = GObject.Property(type=str)
country = GObject.Property(type=str)
def __init__(self, name, email, city, car, country):
super().__init__()
self.name = name
self.email = email
self.city = city
self.car = car
self.country = country
class AppWindow(Gtk.ApplicationWindow):
def __init__(self, app):
super().__init__(application=app, title="ColumnView", default_width=600, default_height=400)
self.model = Gio.ListStore(item_type=User)
self.selection_model = Gtk.SingleSelection(model=self.model)
column_view = Gtk.ColumnView(model=self.selection_model)
self.add_column(column_view, "Name", "name")
self.add_column(column_view, "E-mail", "email")
self.add_column(column_view, "City", "city")
self.add_column(column_view, "Car", "car")
self.add_column(column_view, "Country", "country")
scrolled = Gtk.ScrolledWindow(child=column_view)
self.set_child(scrolled)
self.load_data()
def add_column(self, column_view, title, prop_name):
factory = Gtk.SignalListItemFactory()
factory.connect("setup", lambda factory, item: item.set_child(Gtk.Label(xalign=0)))
def on_bind(factory, list_item):
label = list_item.get_child()
user = list_item.get_item()
label.set_label(getattr(user, prop_name))
factory.connect("bind", on_bind)
col = Gtk.ColumnViewColumn(title=title, factory=factory)
column_view.append_column(col)
def load_data(self):
new_items = []
for i in range(1500):
new_items.append(User(name=f"User {i}", email=f"user{i}@example.com", city="city123", car="car123", country="country 123"))
import time;time1=time.time()
self.model.splice(0, 0, new_items)
print(time.time()-time1)
def on_activate(app):
win = AppWindow(app)
win.present()
app = Gtk.Application(application_id='com.example.abcd')
app.connect('activate', on_activate)
app.run(None)
