buttons: Watch for ImageToggle tooltip text changes

If the application changes the active or inactive tooltip text, then we
want to apply that to the button depending on what state it currently
has.

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

emmental/buttons.py

@@ -119,6 +119,13 @@ class ImageToggle(Button):
                          inactive_tooltip_text=inactive_tooltip_text,
                          tooltip_text=inactive_tooltip_text,
                          active=active, **kwargs)
+        self.connect("notify", self.__notify)
+
+    def __notify(self, toggle: Button, param: GObject.ParamSpec) -> None:
+        match (param.name, self.active):
+            case ("active-tooltip-text", True) | \
+                 ("inactive-tooltip-text", False):
+                self.set_tooltip_text(self.get_property(param.name))
 
     def do_clicked(self) -> None:
         """Handle a click event."""

tests/test_buttons.py

@@ -211,6 +211,17 @@ class TestImageToggle(unittest.TestCase):
         button2.active = False
         self.assertEqual(button2.get_tooltip_text(), "inactive tooltip text")
 
+    def test_changing_tooltip_text(self):
+        """Test changing the tooltip text for the current state."""
+        self.assertEqual(self.button.props.tooltip_text, None)
+        self.button.inactive_tooltip_text = "inactive tooltip"
+        self.assertEqual(self.button.props.tooltip_text, "inactive tooltip")
+
+        self.button.active = True
+        self.assertEqual(self.button.props.tooltip_text, None)
+        self.button.active_tooltip_text = "active tooltip"
+        self.assertEqual(self.button.props.tooltip_text, "active tooltip")
+
     def test_toggle(self):
         """Test the toggle signal."""
         toggled = unittest.mock.Mock()