updated readme

docs/examples/widgets/custom.py

@@ -0,0 +1,33 @@
+from rich.panel import Panel
+
+from textual import events
+from textual.app import App
+from textual.reactive import Reactive
+from textual.widget import Widget
+
+
+class Hover(Widget):
+
+    mouse_over: Reactive[bool] = Reactive(False)
+
+    def render(self) -> Panel:
+        return Panel("Hello [b]World[/b]", style=("on red" if self.mouse_over else ""))
+
+    async def on_enter(self, event: events.Enter) -> None:
+        self.mouse_over = True
+
+    async def on_leave(self, event: events.Leave) -> None:
+        self.mouse_over = False
+
+
+class HoverApp(App):
+    """Demonstrates smooth animation"""
+
+    async def on_mount(self, event: events.Mount) -> None:
+        """Build layout here."""
+
+        hovers = (Hover() for _ in range(10))
+        await self.view.dock(*hovers, edge="top")
+
+
+HoverApp.run(log="textual.log")