add some logic example

lib/main.dart

@@ -65,6 +65,13 @@ class _MyHomePageState extends State<MyHomePage> {
               '$_counter',
               style: Theme.of(context).textTheme.headlineMedium,
             ),
+            Visibility(
+              visible: _counter > 10,
+              child: Text(
+                'Why are you clicking?',
+                style: Theme.of(context).textTheme.headlineMedium,
+              ),
+            )
           ],
         ),
       ),