Symbolic SVG with GTK4 in Python

icon-symbolic.svg

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg
  width="512mm"
  height="288mm"
  viewBox="0 0 512 288"
  version="1.1"
  id="svg"
  xmlns="http://www.w3.org/2000/svg"
  xmlns:svg="http://www.w3.org/2000/svg">
  <g
    id="tile-center"
    style="image-rendering:optimizeQuality">
    <rect
      style="fill:#BEBEBE"
      id="window"
      width="149"
      height="120"
      x="181"
      y="84"
      ry="8" />
  </g>
</svg>

window.py

import gi
import os

gi.require_version("Gtk", "4.0")
from gi.repository import Gtk
from gi.repository import Gio


def on_activate(app):
    win = Gtk.ApplicationWindow(application=app)
    pwd = os.path.dirname(os.path.abspath(__file__))
    icon_path = os.path.join(pwd, "icon-symbolic.svg")
    icon = Gio.Icon.new_for_string(icon_path)
    img = Gtk.Image.new_from_gicon(icon)
    img.set_pixel_size(512)
    win.set_child(img)
    win.present()


app = Gtk.Application(application_id="org.gtk.Example")
app.connect("activate", on_activate)
app.run(None)