Make Item and Button generic over the underlying view

discord/ui/button.py

@@ -41,7 +41,7 @@ __all__ = (
 )
 
 if TYPE_CHECKING:
-    from ..components import Component
+    from .view import View
 
 _custom_emoji = re.compile(r'<?(?P<animated>a)?:?(?P<name>[A-Za-z0-9\_]+):(?P<id>[0-9]{13,20})>?')
 
@@ -63,9 +63,10 @@ def _to_partial_emoji(obj: Union[str, PartialEmoji], *, _custom_emoji=_custom_em
 
 
 B = TypeVar('B', bound='Button')
+V = TypeVar('V', bound='View', covariant=True)
 
 
-class Button(Item):
+class Button(Item[V]):
     """Represents a UI button.
 
     .. versionadded:: 2.0

discord/ui/item.py

@@ -24,7 +24,7 @@ DEALINGS IN THE SOFTWARE.
 
 from __future__ import annotations
 
-from typing import Any, Callable, Coroutine, Dict, Optional, TYPE_CHECKING, Tuple, Type, TypeVar
+from typing import Any, Callable, Coroutine, Dict, Generic, Optional, TYPE_CHECKING, Tuple, Type, TypeVar
 
 from ..interactions import Interaction
 
@@ -38,10 +38,11 @@ if TYPE_CHECKING:
     from ..components import Component
 
 I = TypeVar('I', bound='Item')
+V = TypeVar('V', bound='View', covariant=True)
 ItemCallbackType = Callable[[Any, I, Interaction], Coroutine[Any, Any, Any]]
 
 
-class Item:
+class Item(Generic[V]):
     """Represents the base UI item that all UI components inherit from.
 
     The current UI items supported are:
@@ -52,7 +53,7 @@ class Item:
     __item_repr_attributes__: Tuple[str, ...] = ('group_id',)
 
     def __init__(self):
-        self._view: Optional[View] = None
+        self._view: Optional[V] = None
         self.group_id: Optional[int] = None
 
     def to_component_dict(self) -> Dict[str, Any]:
@@ -77,7 +78,7 @@ class Item:
         return f'<{self.__class__.__name__} {attrs}>'
 
     @property
-    def view(self) -> Optional[View]:
+    def view(self) -> Optional[V]:
         """Optional[:class:`View`]: The underlying view for this item."""
         return self._view