WIP: Add an example of dynamic bindings

examples/dynamic_bindings.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+
+'''
+Example that shows dynamic bindings.
+'''
+
+from textual.app import App, ComposeResult
+from textual.binding import Binding
+from textual.reactive import reactive
+from textual.widgets import Footer, Header
+
+
+class DynamicBindingsApp(App):
+    '''
+    A TUI application that allows you to change binding text dynamically.
+    '''
+    binding_description : reactive[str | None] = reactive("Toggle on")
+
+    BINDINGS = [
+        Binding(key="t", action="toggle", description=binding_description),
+    ]
+
+    def compose(self) -> ComposeResult:
+        '''Build the UI'''
+        yield Header(show_clock=True)
+        yield Footer()
+
+    def action_toggle(self) -> None:
+        '''Toggle callback'''
+        self.binding_description = "Toggle on" if "off" in self.binding_description else "Toggle off"
+
+
+if __name__ == "__main__":
+    app = DynamicBindingsApp()
+    app.run()