end of files

examples/easing.py

@@ -0,0 +1,44 @@
+from textual._easing import EASING
+from textual.app import App
+from textual.reactive import Reactive
+
+from textual.views import DockView
+from textual.widgets import Placeholder, TreeControl, ScrollView, TreeClick
+
+
+class EasingApp(App):
+    """An app do demonstrate easing."""
+
+    side = Reactive(False)
+    easing = Reactive("linear")
+
+    def watch_side(self, side: bool) -> None:
+        """Animate when the side changes (False for left, True for right)."""
+        width = self.easing_view.size.width
+        animate_x = (width - self.placeholder.size.width) if side else 0
+        self.placeholder.animate(
+            "layout_offset_x", animate_x, easing=self.easing, duration=1
+        )
+
+    async def on_mount(self) -> None:
+        """Called when application mode is ready."""
+
+        self.placeholder = Placeholder()
+        self.easing_view = DockView()
+
+        tree = TreeControl("Easing", {})
+        for easing_key in sorted(EASING.keys()):
+            await tree.add(tree.root.id, easing_key, {"easing": easing_key})
+        await tree.root.expand()
+
+        await self.view.dock(ScrollView(tree), edge="left", size=32)
+        await self.view.dock(self.easing_view)
+        await self.easing_view.dock(self.placeholder, edge="left", size=32)
+
+    async def handle_tree_click(self, message: TreeClick[dict]) -> None:
+        """Called in response to a tree click."""
+        self.easing = message.node.data.get("easing", "linear")
+        self.side = not self.side
+
+
+EasingApp().run(log="textual.log")