docstring and private

src/textual/app.py

@@ -601,6 +601,10 @@ class App(Generic[ReturnType], DOMNode):
 
         This property may be used to inspect current bindings.
 
+        Returns:
+
+            A mapping of keys on to node + binding.
+
         """
 
         namespace_binding_map: dict[str, tuple[DOMNode, Binding]] = {}
@@ -625,6 +629,8 @@ class App(Generic[ReturnType], DOMNode):
     def get_css_variables(self) -> dict[str, str]:
         """Get a mapping of variables used to pre-populate CSS.
 
+        May be implemented in a subclass to add new CSS variables.
+
         Returns:
             A mapping of variable name to value.
         """

src/textual/widgets/_footer.py

@@ -60,12 +60,12 @@ class Footer(Widget):
         self._key_text: Text | None = None
         self.auto_links = False
 
-    async def watch_highlight_key(self, value) -> None:
+    async def watch_highlight_key(self, value: str | None) -> None:
         """If highlight key changes we need to regenerate the text."""
         self._key_text = None
         self.refresh()
 
-    def on_mount(self) -> None:
+    def _on_mount(self) -> None:
         self.watch(self.screen, "focused", self._bindings_changed)
         self.watch(self.screen, "stack_updates", self._bindings_changed)
 
@@ -73,11 +73,11 @@ class Footer(Widget):
         self._key_text = None
         self.refresh()
 
-    async def on_mouse_move(self, event: events.MouseMove) -> None:
+    def _on_mouse_move(self, event: events.MouseMove) -> None:
         """Store any key we are moving over."""
         self.highlight_key = event.style.meta.get("key")
 
-    async def on_leave(self, event: events.Leave) -> None:
+    def _on_leave(self, event: events.Leave) -> None:
         """Clear any highlight when the mouse leaves the widget"""
         if self.screen.is_current:
             self.highlight_key = None
@@ -85,7 +85,7 @@ class Footer(Widget):
     def __rich_repr__(self) -> rich.repr.Result:
         yield from super().__rich_repr__()
 
-    def make_key_text(self) -> Text:
+    def _make_key_text(self) -> Text:
         """Create text containing all the keys."""
         base_style = self.rich_style
         text = Text(
@@ -140,5 +140,5 @@ class Footer(Widget):
 
     def render(self) -> RenderableType:
         if self._key_text is None:
-            self._key_text = self.make_key_text()
+            self._key_text = self._make_key_text()
         return self._key_text

src/textual/widgets/_header.py

@@ -126,8 +126,8 @@ class Header(Widget):
 
     DEFAULT_CLASSES = ""
 
-    tall = Reactive(False)
-    """Track if the `Header` is in a tall state or not."""
+    tall: Reactive[bool] = Reactive(False)
+    """Set to `True` for a taller header or `False` for a single line header."""
 
     def __init__(
         self,