[#24, #33, #36] UI building improvements. Fetch bugfix

lib/main.dart

@@ -44,6 +44,7 @@ class _MainPageState extends State<MainPage> {
   HassioDataModel _dataModel;
   Map _entitiesData;
   Map _uiStructure;
+  int _uiViewsCount = 0;
   String _dataModelErrorMessage = "";
   bool loading = true;
   Map _stateIconColors = {
@@ -82,6 +83,7 @@ class _MainPageState extends State<MainPage> {
         setState(() {
           _entitiesData = _dataModel.entities;
           _uiStructure = _dataModel.uiStructure;
+          _uiViewsCount = _uiStructure.length;
           loading = false;
         });
       }).catchError((e) {
@@ -138,16 +140,16 @@ class _MainPageState extends State<MainPage> {
     return result;
   }
 
-  Card _buildEntityGroup(List<String> ids, String name) {
+  Card _buildCard(List<String> ids, String name) {
     List<Widget> body = [];
-    body.add(_buildEntityGroupHeader(name));
-    body.addAll(_buildEntityGroupBody(ids));
+    body.add(_buildCardHeader(name));
+    body.addAll(_buildCardBody(ids));
     Card result =
         Card(child: new Column(mainAxisSize: MainAxisSize.min, children: body));
     return result;
   }
 
-  Widget _buildEntityGroupHeader(String name) {
+  Widget _buildCardHeader(String name) {
     var result;
     if (name.length > 0) {
       result = new ListTile(
@@ -165,7 +167,7 @@ class _MainPageState extends State<MainPage> {
     return result;
   }
 
-  List<Widget> _buildEntityGroupBody(List<String> ids) {
+  List<Widget> _buildCardBody(List<String> ids) {
     List<Widget> entities = [];
     ids.forEach((id) {
       var data = _entitiesData[id];
@@ -185,15 +187,14 @@ class _MainPageState extends State<MainPage> {
     return entities;
   }
 
-  List<Widget> buildEntitiesView() {
-    if ((_entitiesData != null) && (_uiStructure != null)) {
+  List<Widget> buildSingleView(structure) {
       List<Widget> result = [];
       if (_dataModelErrorMessage.length == 0) {
-        _uiStructure["standalone"].forEach((entityId) {
-          result.add(_buildEntityGroup([entityId], ""));
+        structure["standalone"].forEach((entityId) {
+          result.add(_buildCard([entityId], ""));
         });
-        _uiStructure["groups"].forEach((group) {
-          result.add(_buildEntityGroup(
+        structure["groups"].forEach((group) {
+          result.add(_buildCard(
               group["children"], group["friendly_name"].toString()));
         });
       } else {
@@ -201,10 +202,30 @@ class _MainPageState extends State<MainPage> {
         //result.add(Text(_dataModelErrorMessage));
       }
       return result;
-    } else {
-      //TODO
-      return [];
   }
+
+  List<ListView> buildUIViews() {
+    List<ListView> result = [];
+    if ((_entitiesData != null) && (_uiStructure != null)) {
+      _uiStructure.forEach((viewId, structure) {
+        result.add(ListView(
+          children: buildSingleView(structure),
+        ));
+      });
+    }
+    return result;
+  }
+
+  List<Tab> buildUIViewTabs() {
+    List<Tab> result = [];
+    if ((_entitiesData != null) && (_uiStructure != null)) {
+      _uiStructure.forEach((viewId, structure) {
+        result.add(
+            Tab(icon: Icon(IconData(structure["iconCode"], fontFamily: 'Material Design Icons')))
+        );
+      });
+    }
+    return result;
   }
 
   Widget _buildTitle() {
@@ -223,21 +244,8 @@ class _MainPageState extends State<MainPage> {
     return titleRow;
   }
 
-  @override
-  Widget build(BuildContext context) {
-    // This method is rerun every time setState is called, for instance as done
-    // by the _incrementCounter method above.
-    //
-    // The Flutter framework has been optimized to make rerunning build methods
-    // fast, so that you can just rebuild anything that needs updating rather
-    // than having to individually change instances of widgets.
-    return new Scaffold(
-      appBar: new AppBar(
-        // Here we take the value from the MyHomePage object that was created by
-        // the App.build method, and use it to set our appbar title.
-        title: _buildTitle(),
-      ),
-      drawer: new Drawer(
+  Drawer _buildAppDrawer() {
+    return new Drawer(
       child: ListView(
         children: <Widget>[
           new UserAccountsDrawerHeader(
@@ -262,14 +270,50 @@ class _MainPageState extends State<MainPage> {
           )
         ],
       ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // This method is rerun every time setState is called.
+    //
+    if (_entitiesData == null) {
+      return new Scaffold(
+        appBar: new AppBar(
+          title: _buildTitle()
         ),
-      body: ListView(children: buildEntitiesView()),
+        drawer: _buildAppDrawer(),
+        body: Text("Loading... or not...\n\nPlease, restart the app in case of three dots in header starts to freaking you out."),
         floatingActionButton: new FloatingActionButton(
           onPressed: _refreshData,
           tooltip: 'Increment',
           child: new Icon(Icons.refresh),
         ),
       );
+    } else {
+      return DefaultTabController(
+          length: _uiViewsCount,
+          child: new Scaffold(
+            appBar: new AppBar(
+              // Here we take the value from the MyHomePage object that was created by
+              // the App.build method, and use it to set our appbar title.
+              title: _buildTitle(),
+              bottom: TabBar(
+                  tabs: buildUIViewTabs()
+              ),
+            ),
+            drawer: _buildAppDrawer(),
+            body: TabBarView(
+                children: buildUIViews()
+            ),
+            floatingActionButton: new FloatingActionButton(
+              onPressed: _refreshData,
+              tooltip: 'Increment',
+              child: new Icon(Icons.refresh),
+            ),
+          )
+      );
+    }
   }
 
   @override