add new can_focus_children attribute

sandbox/uber.py

@@ -23,12 +23,6 @@ class BasicApp(App):
     async def on_mount(self):
         """Build layout here."""
 
-        uber2 = Widget()
-        uber2.add_children(
-            Widget(id="uber2-child1"),
-            Widget(id="uber2-child2"),
-        )
-        first_child = Placeholder(id="child1", classes="list-item")
         uber1 = Widget(
             Placeholder(id="child1", classes="list-item"),
             Placeholder(id="child2", classes="list-item"),
@@ -38,7 +32,6 @@ class BasicApp(App):
             Placeholder(classes="list-item"),
         )
         self.mount(uber1=uber1)
-        await first_child.focus()
 
     async def on_key(self, event: events.Key) -> None:
         await self.dispatch_key(event)

src/textual/app.py

@@ -224,7 +224,7 @@ class App(Generic[ReturnType], DOMNode):
             if node is None:
                 pop()
             else:
-                if node.is_container and node.can_focus:
+                if node.is_container and node.can_focus_children:
                     push(iter(node.focusable_children))
                 else:
                     if node.can_focus:

src/textual/widget.py

@@ -65,6 +65,7 @@ class RenderCache(NamedTuple):
 class Widget(DOMNode):
 
     can_focus: bool = False
+    can_focus_children: bool = True
 
     CSS = """
     """
@@ -347,9 +348,12 @@ class Widget(DOMNode):
             x=self.scroll_target_x + self.container_size.width, animate=animate
         )
 
-    def __init_subclass__(cls, can_focus: bool = True) -> None:
+    def __init_subclass__(
+        cls, can_focus: bool = True, can_focus_children: bool = True
+    ) -> None:
         super().__init_subclass__()
         cls.can_focus = can_focus
+        cls.can_focus_children = can_focus_children
 
     def __rich_repr__(self) -> rich.repr.Result:
         yield "id", self.id, None

tests/test_focus.py

@@ -7,7 +7,7 @@ class Focusable(Widget, can_focus=True):
     pass
 
 
-class NonFocusable(Widget, can_focus=False):
+class NonFocusable(Widget, can_focus=False, can_focus_children=False):
     pass