Code structure

lib/ui/card.class.dart

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+part of '../main.dart';
+
+class HACard {
+  List<Entity> entities = [];
+  Entity linkedEntity;
+  String name;
+  String id;
+
+  HACard({
+    this.name,
+    this.id,
+    this.linkedEntity
+  });
+
+  Widget build(BuildContext context) {
+    return HACardWidget(
+      card: this,
+    );
+  }
+
+}
+
+class HACardWidget extends StatelessWidget {
+
+  final HACard card;
+
+  const HACardWidget({
+    Key key,
+    this.card
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    if ((card.linkedEntity!= null) && (card.linkedEntity.isHidden)) {
+      return Container(width: 0.0, height: 0.0,);
+    }
+    List<Widget> body = [];
+    body.add(_buildCardHeader());
+    body.addAll(_buildCardBody(context));
+    return Card(
+        child: new Column(mainAxisSize: MainAxisSize.min, children: body)
+    );
+  }
+
+  Widget _buildCardHeader() {
+    var result;
+    if ((card.name != null) && (card.name.trim().length > 0)) {
+      result = new ListTile(
+        title: Text("${card.name}",
+            textAlign: TextAlign.left,
+            overflow: TextOverflow.ellipsis,
+            style: new TextStyle(fontWeight: FontWeight.bold, fontSize: 25.0)),
+      );
+    } else {
+      result = new Container(width: 0.0, height: 0.0);
+    }
+    return result;
+  }
+
+  List<Widget> _buildCardBody(BuildContext context) {
+    List<Widget> result = [];
+    card.entities.forEach((Entity entity) {
+      if (!entity.isHidden) {
+        result.add(
+            Padding(
+              padding: EdgeInsets.fromLTRB(0.0, 10.0, 0.0, 10.0),
+              child: entity.buildDefaultWidget(context),
+            ));
+      }
+    });
+    return result;
+  }
+
+}

lib/ui/ui.dart

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+part of '../main.dart';
+
+class HomeAssistantUI {
+  List<HAView> views;
+
+  HomeAssistantUI() {
+    views = [];
+  }
+
+  Widget build(BuildContext context) {
+    return TabBarView(
+        children: _buildViews(context)
+    );
+  }
+
+  List<Widget> _buildViews(BuildContext context) {
+    List<Widget> result = [];
+    views.forEach((view) {
+      result.add(
+        view.build(context)
+      );
+    });
+    return result;
+  }
+
+}

lib/ui/view.class.dart

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+part of '../main.dart';
+
+class HAView {
+  List<HACard> cards = [];
+  List<Entity> badges = [];
+  Entity linkedEntity;
+  String name;
+  String id;
+  String iconName;
+  int count;
+
+  HAView({
+    this.name,
+    this.id,
+    this.count,
+    this.iconName,
+    List<Entity> childEntities
+  }) {
+    _fillView(childEntities ?? []);
+  }
+
+  void _fillView(List<Entity> childEntities) {
+    List<HACard> autoGeneratedCards = [];
+    childEntities.forEach((entity) {
+      if (entity.isBadge) {
+        badges.add(entity);
+        TheLogger.debug("----Badge: ${entity.entityId}");
+      } else {
+        if (!entity.isGroup) {
+          String groupIdToAdd = "${entity.domain}.${entity.domain}$count";
+          if (autoGeneratedCards.every((HACard card) => card.id != groupIdToAdd )) {
+            HACard card = HACard(
+                id: groupIdToAdd,
+                name: entity.domain
+            );
+            TheLogger.debug("----Creating card: $groupIdToAdd");
+            card.entities.add(entity);
+            autoGeneratedCards.add(card);
+          } else {
+            autoGeneratedCards.firstWhere((card) => card.id == groupIdToAdd).entities.add(entity);
+          }
+        } else {
+          TheLogger.debug("----Card: ${entity.entityId}");
+          HACard card = HACard(
+              name: entity.displayName,
+              id: entity.entityId,
+              linkedEntity: entity
+          );
+          card.entities.addAll(entity.childEntities);
+          cards.add(card);
+        }
+      }
+    });
+    cards.addAll(autoGeneratedCards);
+  }
+
+  Widget build(BuildContext context) {
+    return HAViewWidget(
+      view: this,
+    );
+  }
+}
+
+class HAViewWidget extends StatefulWidget {
+  final HAView view;
+
+  const HAViewWidget({
+    Key key,
+    this.view
+  }) : super(key: key);
+
+  @override
+  State<StatefulWidget> createState() {
+    return HAViewWidgetState();
+  }
+
+}
+
+class HAViewWidgetState extends State<HAViewWidget> {
+
+  StreamSubscription _refreshDataSubscription;
+  Completer _refreshCompleter;
+
+  @override
+  void initState() {
+    super.initState();
+    _refreshDataSubscription = eventBus.on<RefreshDataFinishedEvent>().listen((event) {
+      if ((_refreshCompleter != null) && (!_refreshCompleter.isCompleted)) {
+        _refreshCompleter.complete();
+      }
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return RefreshIndicator(
+      color: Colors.amber,
+      child: ListView(
+        physics: const AlwaysScrollableScrollPhysics(),
+        children: _buildChildren(context),
+      ),
+      onRefresh: () => _refreshData(),
+    );
+  }
+
+  List<Widget> _buildChildren(BuildContext context) {
+    List<Widget> result = [];
+
+    if (widget.view.badges.isNotEmpty) {
+      result.insert(0,
+          Wrap(
+            alignment: WrapAlignment.center,
+            spacing: 10.0,
+            runSpacing: 1.0,
+            children: _buildBadges(context),
+          )
+      );
+    }
+
+    widget.view.cards.forEach((HACard card){
+      result.add(
+          card.build(context)
+      );
+    });
+
+    return result;
+  }
+
+  List<Widget> _buildBadges(BuildContext context) {
+    List<Widget> result = [];
+    widget.view.badges.forEach((Entity entity) {
+      if (!entity.isHidden) {
+        result.add(entity.buildBadgeWidget(context));
+      }
+    });
+    return result;
+  }
+
+  Future _refreshData() {
+    if ((_refreshCompleter != null) && (!_refreshCompleter.isCompleted)) {
+      TheLogger.debug("Previous data refresh is still in progress");
+    } else {
+      _refreshCompleter = Completer();
+      eventBus.fire(RefreshDataEvent());
+    }
+    return _refreshCompleter.future;
+  }
+
+  @override
+  void dispose() {
+    _refreshDataSubscription.cancel();
+    super.dispose();
+  }
+
+
+}