added example

examples/splash.py

@@ -0,0 +1,58 @@
+from time import time
+
+from textual.app import App, ComposeResult, RenderableType
+from textual.containers import Container
+from textual.renderables.gradient import LinearGradient
+from textual.widgets import Static
+
+COLORS = [
+    "#881177",
+    "#aa3355",
+    "#cc6666",
+    "#ee9944",
+    "#eedd00",
+    "#99dd55",
+    "#44dd88",
+    "#22ccbb",
+    "#00bbcc",
+    "#0099cc",
+    "#3366bb",
+    "#663399",
+]
+STOPS = [(i / (len(COLORS) - 1), color) for i, color in enumerate(COLORS)]
+
+
+class Splash(Container):
+    """Custom widget that extends Container."""
+
+    DEFAULT_CSS = """
+    Splash {
+        align: center middle;
+    }
+    Static {
+        width: 40;
+        padding: 2 4;
+    }
+    """
+
+    def on_mount(self) -> None:
+        self.auto_refresh = 1 / 30
+
+    def compose(self) -> ComposeResult:
+        yield Static("Making a splash with Textual!")
+
+    def render(self) -> RenderableType:
+        return LinearGradient(time() * 90, STOPS)
+
+
+class SplashApp(App):
+    """Simple app to show our custom widget."""
+
+    def compose(self) -> ComposeResult:
+        yield Splash()
+
+
+if __name__ == "__main__":
+    app = SplashApp()
+    app.run()
+    print("https://textual.textualize.io/how-to/render-and-compose/")