Resolves #258 Timer support

lib/entity_widgets/entity_colors.class.dart

@@ -10,7 +10,7 @@ class EntityColor {
   static const _stateColors = {
     EntityState.on: Colors.amber,
     "auto": Colors.amber,
-    EntityState.idle: Colors.amber,
+    EntityState.active: Colors.amber,
     EntityState.playing: Colors.amber,
     "above_horizon": Colors.amber,
     EntityState.home:  Colors.amber,
@@ -19,6 +19,7 @@ class EntityColor {
     EntityState.closed: Color.fromRGBO(68, 115, 158, 1.0),
     "below_horizon": Color.fromRGBO(68, 115, 158, 1.0),
     "default": Color.fromRGBO(68, 115, 158, 1.0),
+    EntityState.idle: Color.fromRGBO(68, 115, 158, 1.0),
     "heat": Colors.redAccent,
     "cool": Colors.lightBlue,
     EntityState.unavailable: Colors.black26,

lib/entity_widgets/state/simple_state.dart

@@ -6,14 +6,20 @@ class SimpleEntityState extends StatelessWidget {
   final TextAlign textAlign;
   final EdgeInsetsGeometry padding;
   final int maxLines;
+  final String customValue;
 
-  const SimpleEntityState({Key key, this.maxLines: 10, this.expanded: true, this.textAlign: TextAlign.right, this.padding: const EdgeInsets.fromLTRB(0.0, 0.0, Sizes.rightWidgetPadding, 0.0)}) : super(key: key);
+  const SimpleEntityState({Key key, this.maxLines: 10, this.expanded: true, this.textAlign: TextAlign.right, this.padding: const EdgeInsets.fromLTRB(0.0, 0.0, Sizes.rightWidgetPadding, 0.0), this.customValue}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
     final entityModel = EntityModel.of(context);
-    String state = entityModel.entityWrapper.entity.displayState ?? "";
-    state = state.replaceAll("\n", "").replaceAll("\t", " ").trim();
+    String state;
+    if (customValue == null) {
+      state = entityModel.entityWrapper.entity.displayState ?? "";
+      state = state.replaceAll("\n", "").replaceAll("\t", " ").trim();
+    } else {
+      state = customValue;
+    }
     TextStyle textStyle =  TextStyle(
       fontSize: Sizes.stateFontSize,
     );

lib/entity_widgets/state/timer_state.dart

@@ -0,0 +1,65 @@
+part of '../../main.dart';
+
+class TimerState extends StatefulWidget  {
+  //final bool expanded;
+  //final TextAlign textAlign;
+  //final EdgeInsetsGeometry padding;
+  //final int maxLines;
+
+  const TimerState({Key key}) : super(key: key);
+
+  @override
+  _TimerStateState createState() => _TimerStateState();
+
+}
+
+class _TimerStateState extends State<TimerState> {
+
+  Timer timer;
+  Duration remaining = Duration(seconds: 0);
+
+  void checkState(TimerEntity entity) {
+    if (entity.state == EntityState.active) {
+      //Logger.d("Timer is active");
+      if (timer == null || !timer.isActive) {
+        timer = Timer.periodic(Duration(seconds: 1), (timer) {
+          setState(() {
+            try {
+              int passed = DateTime
+                  .now()
+                  .difference(entity._lastUpdated)
+                  .inSeconds;
+              remaining = Duration(seconds: entity.duration.inSeconds - passed);
+            } catch (e) {
+              Logger.e("Error calculating ${entity.entityId} remaining time: ${e.toString()}");
+              remaining = Duration(seconds: 0);
+            }
+          });
+        });
+      }
+    } else {
+      timer?.cancel();
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    EntityModel model = EntityModel.of(context);
+    TimerEntity entity = model.entityWrapper.entity;
+    checkState(entity);
+    if (entity.state != EntityState.active) {
+      return SimpleEntityState();
+    } else {
+      return SimpleEntityState(
+        customValue: "${remaining.toString().split('.')[0]}",
+      );
+    }
+  }
+
+  @override
+  void dispose() {
+    timer?.cancel();
+    super.dispose();
+  }
+
+}