[pygobject/wip/mschraal/gtk4-container-removal] gtk overrides: Remove Container use for GTK4

[Marinus Schraal <mschraal src gnome org>]

commit 224309b264947848899a4df931d0b5f58e7326ab
Author: Marinus Schraal <mschraal gnome org>
Date:   Mon Jun 8 16:27:55 2020 +0200

    gtk overrides: Remove Container use for GTK4

 gi/overrides/Gtk.py         | 33 +++++++++++++++++----------------
 tests/test_overrides_gtk.py | 18 +++++++++++++-----
 2 files changed, 30 insertions(+), 21 deletions(-)
---
diff --git a/gi/overrides/Gtk.py b/gi/overrides/Gtk.py
index 64a5088e..5092bca2 100644
--- a/gi/overrides/Gtk.py
+++ b/gi/overrides/Gtk.py
@@ -165,24 +165,23 @@ Widget = override(Widget)
 __all__.append('Widget')
 
 
-class Container(Gtk.Container, Widget):
+if Gtk._version in ("2.0", "3.0"):
+    class Container(Gtk.Container, Widget):
 
-    def __len__(self):
-        return len(self.get_children())
+        def __len__(self):
+            return len(self.get_children())
 
-    def __contains__(self, child):
-        return child in self.get_children()
+        def __contains__(self, child):
+            return child in self.get_children()
 
-    def __iter__(self):
-        return iter(self.get_children())
+        def __iter__(self):
+            return iter(self.get_children())
 
-    def __bool__(self):
-        return True
+        def __bool__(self):
+            return True
 
-    # alias for Python 2.x object protocol
-    __nonzero__ = __bool__
-
-    if Gtk._version in ("2.0", "3.0"):
+        # alias for Python 2.x object protocol
+        __nonzero__ = __bool__
 
         def child_get_property(self, child, property_name, value=None):
             if value is None:
@@ -207,9 +206,11 @@ class Container(Gtk.Container, Widget):
 
         get_focus_chain = strip_boolean_result(Gtk.Container.get_focus_chain)
 
-
-Container = override(Container)
-__all__.append('Container')
+    Container = override(Container)
+    __all__.append('Container')
+else:
+    class Container(object):
+        pass
 
 
 class Editable(Gtk.Editable):
diff --git a/tests/test_overrides_gtk.py b/tests/test_overrides_gtk.py
index ff3acba9..99342a63 100644
--- a/tests/test_overrides_gtk.py
+++ b/tests/test_overrides_gtk.py
@@ -58,7 +58,10 @@ def realized(widget):
 
     if toplevel is None:
         window = Gtk.Window()
-        window.add(widget)
+        if Gtk._version == "4.0":
+            window.set_child(widget)
+        else:
+            window.add(widget)
 
     widget.realize()
     if Gtk._version == "4.0":
@@ -161,6 +164,7 @@ def test_wrapper_toggle_refs():
 @unittest.skipUnless(Gtk, 'Gtk not available')
 @ignore_gi_deprecation_warnings
 class TestGtk(unittest.TestCase):
+    @unittest.skipIf(Gtk_version == "4.0", "not in gtk4")
     def test_container(self):
         box = Gtk.Box()
         self.assertTrue(isinstance(box, Gtk.Box))
@@ -557,7 +561,8 @@ class TestGtk(unittest.TestCase):
         # test Gtk.Button
         button = Gtk.Button()
         self.assertTrue(isinstance(button, Gtk.Button))
-        self.assertTrue(isinstance(button, Gtk.Container))
+        if Gtk._version != "4.0":
+            self.assertTrue(isinstance(button, Gtk.Container))
         self.assertTrue(isinstance(button, Gtk.Widget))
 
         if Gtk_version != "4.0":
@@ -579,7 +584,8 @@ class TestGtk(unittest.TestCase):
         # test Gtk.LinkButton
         button = Gtk.LinkButton(uri='http://www.Gtk.org', label='Gtk')
         self.assertTrue(isinstance(button, Gtk.Button))
-        self.assertTrue(isinstance(button, Gtk.Container))
+        if Gtk._version != "4.0":
+            self.assertTrue(isinstance(button, Gtk.Container))
         self.assertTrue(isinstance(button, Gtk.Widget))
         self.assertEqual('http://www.Gtk.org', button.get_uri())
         self.assertEqual('Gtk', button.get_label())
@@ -662,7 +668,8 @@ class TestGtk(unittest.TestCase):
     def test_table(self):
         table = Gtk.Table()
         self.assertTrue(isinstance(table, Gtk.Table))
-        self.assertTrue(isinstance(table, Gtk.Container))
+        if Gtk._version != "4.0":
+            self.assertTrue(isinstance(table, Gtk.Container))
         self.assertTrue(isinstance(table, Gtk.Widget))
         self.assertEqual(table.get_size(), (1, 1))
         self.assertEqual(table.get_homogeneous(), False)
@@ -683,7 +690,8 @@ class TestGtk(unittest.TestCase):
     def test_scrolledwindow(self):
         sw = Gtk.ScrolledWindow()
         self.assertTrue(isinstance(sw, Gtk.ScrolledWindow))
-        self.assertTrue(isinstance(sw, Gtk.Container))
+        if Gtk._version != "4.0":
+            self.assertTrue(isinstance(sw, Gtk.Container))
         self.assertTrue(isinstance(sw, Gtk.Widget))
         sb = sw.get_hscrollbar()
         self.assertEqual(sw.get_hadjustment(), sb.get_adjustment())