renamed update_ to watch_

Author: willmcgugan

src/textual/app.py

@@ -384,7 +384,7 @@ async def on_load(self, event: events.Load) -> None:
 
         show_bar: Reactive[bool] = Reactive(False)
 
-        def update_show_bar(self, show_bar: bool) -> None:
+        def watch_show_bar(self, show_bar: bool) -> None:
             self.animator.animate(self.bar, "layout_offset_x", -40 if show_bar else 0)
 
         async def action_toggle_sidebar(self) -> None:

src/textual/page.py

@@ -91,7 +91,7 @@ def contents_size(self) -> Dimensions:
     def validate_y(self, value: int) -> int:
         return max(0, value)
 
-    def update_y(self, new: int) -> None:
+    def watch_y(self, new: int) -> None:
         x, y = self._page.offset
         self._page.offset = Point(x, new)
 

src/textual/reactive.py

@@ -54,9 +54,9 @@ def __set__(self, obj: Reactable, value: ReactiveType) -> None:
 
             if current_value != value:
 
-                update_function = getattr(obj, f"update_{self.name}", None)
-                if callable(update_function):
-                    update_function(value)
+                watch_function = getattr(obj, f"watch_{self.name}", None)
+                if callable(watch_function):
+                    watch_function(value)
                 setattr(obj, self.internal_name, value)
 
                 if self.layout:

src/textual/widgets/scroll_view.py

@@ -51,7 +51,7 @@ def validate_y(self, value: float) -> float:
     def validate_target_y(self, value: float) -> float:
         return clamp(value, 0, self._page.contents_size.height - self.size.height)
 
-    def update_y(self, new_value: float) -> None:
+    def watch_y(self, new_value: float) -> None:
         self._page.y = round(new_value)
         self._vertical_scrollbar.position = round(new_value)