data table columns

old examples/simple.py

@@ -0,0 +1,51 @@
+from rich.markdown import Markdown
+
+from textual.app import App
+from textual.widgets import Header, Footer, Placeholder, ScrollView
+
+
+class MyApp(App):
+    """An example of a very simple Textual App"""
+
+    stylesheet = """
+
+    App > View {
+        layout: dock
+    }
+
+    #body {
+        padding: 1
+    }
+
+    #sidebar {
+        edge left
+        size: 40
+    }
+
+    """
+
+    async def on_load(self) -> None:
+        """Bind keys with the app loads (but before entering application mode)"""
+        await self.bind("b", "view.toggle('sidebar')", "Toggle sidebar")
+        await self.bind("q", "quit", "Quit")
+
+    async def on_mount(self) -> None:
+        """Create and dock the widgets."""
+
+        body = ScrollView()
+        await self.screen.mount(
+            Header(),
+            Footer(),
+            body=body,
+            sidebar=Placeholder(),
+        )
+
+        async def get_markdown(filename: str) -> None:
+            with open(filename, "rt") as fh:
+                readme = Markdown(fh.read(), hyperlinks=True)
+            await body.update(readme)
+
+        await self.call_later(get_markdown, "richreadme.md")
+
+
+MyApp.run(title="Simple App", log_path="textual.log")