slots

src/textual/events.py

@@ -92,6 +92,7 @@ class Idle(Event, type=EventType.IDLE):
 
 
 class Resize(Event, type=EventType.RESIZE):
+    __slots__ = ["width", "height"]
     width: int
     height: int
 
@@ -119,7 +120,7 @@ class Shutdown(Event, type=EventType.SHUTDOWN):
 
 @rich_repr
 class Key(Event, type=EventType.KEY, bubble=True):
-    code: int = 0
+    __slots__ = ["code"]
 
     def __init__(self, sender: MessageTarget, code: int) -> None:
         super().__init__(sender)
@@ -136,6 +137,8 @@ class Key(Event, type=EventType.KEY, bubble=True):
 
 @rich_repr
 class Move(Event, type=EventType.MOVE):
+    __slots__ = ["x", "y"]
+
     def __init__(self, sender: MessageTarget, x: int, y: int) -> None:
         super().__init__(sender)
         self.x = x
@@ -148,6 +151,8 @@ class Move(Event, type=EventType.MOVE):
 
 @rich_repr
 class _MouseBase(Event, type=EventType.PRESS):
+    __slots__ = ["x", "y", "button", "alt", "ctrl", "shift"]
+
     def __init__(
         self,
         sender: MessageTarget,
@@ -193,6 +198,8 @@ class DoubleClick(_MouseBase, type=EventType.DOUBLE_CLICK):
 
 @rich_repr
 class Timer(Event, type=EventType.TIMER, priority=10):
+    __slots__ = ["time", "count", "callback"]
+
     def __init__(
         self,
         sender: MessageTarget,
@@ -211,6 +218,8 @@ class Timer(Event, type=EventType.TIMER, priority=10):
 
 @rich_repr
 class Enter(Event, type=EventType.ENTER):
+    __slots__ = ["x", "y"]
+
     def __init__(self, sender: MessageTarget, x: int, y: int) -> None:
         super().__init__(sender)
         self.x = x
@@ -234,5 +243,5 @@ class Blur(Event, type=EventType.BLUR):
 
 
 class Update(Event, type=EventType.UPDATE):
-    def can_batch(self, event: Event) -> bool:
+    def can_batch(self, event: Message) -> bool:
         return isinstance(event, Update) and event.sender == self.sender

src/textual/message.py

@@ -9,17 +9,24 @@ from ._types import MessageTarget
 class Message:
     """Base class for a message."""
 
+    __slots__ = [
+        "sender",
+        "name",
+        "time",
+        "_no_default_action",
+        "_stop_propagation",
+    ]
+
     sender: MessageTarget
     bubble: ClassVar[bool] = False
     default_priority: ClassVar[int] = 0
 
-    _no_default_action: bool = False
-    _stop_propagaton: bool = False
-
     def __init__(self, sender: MessageTarget) -> None:
         self.sender = sender
         self.name = camel_to_snake(self.__class__.__name__)
         self.time = monotonic()
+        self._no_default_action = False
+        self._stop_propagaton = False
         super().__init__()
 
     def __init_subclass__(cls, bubble: bool = False, priority: int = 0) -> None: