Project structure change

lib/ui.dart

@@ -0,0 +1,34 @@
+part of 'main.dart';
+
+class HomeAssistantUI {
+  List<HAView> views;
+  String title;
+
+  bool get isEmpty => views == null || views.isEmpty;
+
+  HomeAssistantUI() {
+    views = [];
+  }
+
+  Widget build(BuildContext context, TabController tabController) {
+    return TabBarView(
+      controller: tabController,
+      children: _buildViews(context)
+    );
+  }
+
+  List<Widget> _buildViews(BuildContext context) {
+    List<Widget> result = [];
+    views.forEach((view) {
+      result.add(
+        view.build(context)
+      );
+    });
+    return result;
+  }
+
+  void clear() {
+    views.clear();
+  }
+
+}