UI: Start basic files for GtkApplication and GtkWindows

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

emmental-gtk4.py

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+#!/usr/bin/python
+# Copyright 2021 (c) Anna Schumaker.
+import gi
+gi.require_version('Gtk', '4.0')
+
+import lib
+import trackdb
+lib.settings.load()
+trackdb.load()
+
+import ui
+ui.Application.run()

test_ui.py

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+# Copyright 2021 (c) Anna Schumaker.
+import unittest
+import ui
+from gi.repository import Gtk
+
+class TestEmmentalApplication(unittest.TestCase):
+    def test_application(self):
+        app = ui.EmmentalApplication()
+        self.assertIsInstance(app, Gtk.Application)

ui/__init__.py

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+# Copyright 2021 (c) Anna Schumaker.
+from . import window
+from gi.repository import Gtk
+
+class EmmentalApplication(Gtk.Application):
+    def __init__(self, *args, **kwargs):
+        Gtk.Application.__init__(self, *args, application_id="org.gtk.emmental", **kwargs)
+
+    def do_activate(self):
+        window.Window.present()
+
+    def do_startup(self):
+        Gtk.Application.do_startup(self)
+        self.add_window(window.Window)
+
+Application = EmmentalApplication()

ui/test_window.py

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+# Copyright 2021 (c) Anna Schumaker.
+import unittest
+from . import window
+from gi.repository import Gtk
+
+class TestUIWindow(unittest.TestCase):
+    def test_window(self):
+        self.assertIsInstance(window.Window, Gtk.ApplicationWindow)

ui/window.py

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+# Copyright 2021 (c) Anna Schumaker.
+import gi
+gi.require_version("Gtk", "4.0")
+from gi.repository import Gtk
+
+Window = Gtk.ApplicationWindow()