Initial commit of Effen reactive framework experiment for Sky

sky/examples/fn/widgets/buttonbase.dart

+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;
+    });
+  }
+}