Separate entity classes on different files

lib/entity_class/datetime_entity.class.dart

@@ -0,0 +1,94 @@
+part of '../main.dart';
+
+class DateTimeEntity extends Entity {
+  bool get hasDate => _attributes["has_date"] ?? false;
+  bool get hasTime => _attributes["has_time"] ?? false;
+  int get year => _attributes["year"] ?? 1970;
+  int get month => _attributes["month"] ?? 1;
+  int get day => _attributes["day"] ?? 1;
+  int get hour => _attributes["hour"] ?? 0;
+  int get minute => _attributes["minute"] ?? 0;
+  int get second => _attributes["second"] ?? 0;
+  String get formattedState => _getFormattedState();
+  DateTime get dateTimeState => _getDateTimeState();
+
+  DateTimeEntity(Map rawData) : super(rawData);
+
+  DateTime _getDateTimeState() {
+    return DateTime(this.year, this.month, this.day, this.hour, this.minute, this.second);
+  }
+
+  String _getFormattedState() {
+    String formattedState = "";
+    if (this.hasDate) {
+      formattedState += formatDate(dateTimeState, [M, ' ', d, ', ', yyyy]);
+    }
+    if (this.hasTime) {
+      formattedState += " "+formatDate(dateTimeState, [HH, ':', nn]);
+    }
+    return formattedState;
+  }
+
+  @override
+  void sendNewState(newValue) {
+    eventBus.fire(new ServiceCallEvent(_domain, "set_datetime", _entityId,
+        newValue));
+  }
+
+  @override
+  Widget _buildActionWidget(bool inCard, BuildContext context) {
+    return Padding(
+        padding:
+        EdgeInsets.fromLTRB(0.0, 0.0, Entity.RIGHT_WIDGET_PADDING, 0.0),
+        child: GestureDetector(
+          child: Text(
+              "$formattedState",
+              textAlign: TextAlign.right,
+              style: new TextStyle(
+                fontSize: Entity.STATE_FONT_SIZE,
+              )),
+          onTap: () => _handleStateTap(context),
+        )
+    );
+  }
+
+  void _handleStateTap(BuildContext context) {
+    if (hasDate) {
+      _showDatePicker(context).then((date) {
+        if (date != null) {
+          if (hasTime) {
+            _showTimePicker(context).then((time){
+              sendNewState({"date": "${formatDate(date, [yyyy, '-', mm, '-', dd])}", "time": "${formatDate(DateTime(1970, 1, 1, time.hour, time.minute), [HH, ':', nn])}"});
+            });
+          } else {
+            sendNewState({"date": "${formatDate(date, [yyyy, '-', mm, '-', dd])}"});
+          }
+        }
+      });
+    } else if (hasTime) {
+      _showTimePicker(context).then((time){
+        if (time != null) {
+          sendNewState({"time": "${formatDate(DateTime(1970, 1, 1, time.hour, time.minute), [HH, ':', nn])}"});
+        }
+      });
+    } else {
+      TheLogger.log("Warning", "$entityId has no date and no time");
+    }
+  }
+
+  Future _showDatePicker(BuildContext context) {
+    return showDatePicker(
+        context: context,
+        initialDate: dateTimeState,
+        firstDate: DateTime(1970),
+        lastDate: DateTime(2037) //Unix timestamp will finish at Jan 19, 2038
+    );
+  }
+
+  Future _showTimePicker(BuildContext context) {
+    return showTimePicker(
+        context: context,
+        initialTime: TimeOfDay.fromDateTime(dateTimeState)
+    );
+  }
+}