Initial commit of Effen reactive framework experiment for Sky

sky/examples/fn/widgets/buttonbase.dart

Index: sky/examples/fn/widgets/buttonbase.dart
diff --git a/sky/examples/fn/widgets/buttonbase.dart b/sky/examples/fn/widgets/buttonbase.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f7b1bf7e8dd40a8e82dea3be2fce1233fc4082f6
--- /dev/null
+++ b/sky/examples/fn/widgets/buttonbase.dart
@@ -0,0 +1,24 @@
+part of widgets;
+
+abstract class ButtonBase extends Component {
+
+  bool _highlight = false;
+
+  ButtonBase({ Object key }) : super(key: key);
+
+  void _handlePointerDown(_) {
+    setState(() {
+      _highlight = true;
+    });
+  }
+  void _handlePointerUp(_) {
+    setState(() {
+      _highlight = false;
+    });
+  }
+  void _handlePointerCancel(_) {
+    setState(() {
+      _highlight = false;
+    });
+  }
+}