Add convenience comparison operators for DeviceScreenType and RefinedSize

Author: tjarvstrand

lib/src/device_screen_type.dart

@@ -1,16 +1,43 @@
+import 'package:responsive_builder/responsive_builder.dart';
+
 enum DeviceScreenType {
   @Deprecated('Use lowercase version')
-  Mobile,
+  Mobile(1),
   @Deprecated('Use lowercase version')
-  Tablet,
+  Tablet(2),
   @Deprecated('Use lowercase version')
-  Desktop,
+  Desktop(3),
   @Deprecated('Use lowercase version')
-  Watch,
-  mobile,
-  tablet,
-  desktop,
-  watch
+  Watch(0),
+  mobile(1),
+  tablet(2),
+  desktop(3),
+  watch(0);
+
+  const DeviceScreenType(this._ordinal);
+
+  final int _ordinal;
+
+  bool operator >(DeviceScreenType other) => _ordinal > other._ordinal;
+
+  bool operator >=(DeviceScreenType other) => _ordinal >= other._ordinal;
+
+  bool operator <(DeviceScreenType other) => _ordinal < other._ordinal;
+
+  bool operator <=(DeviceScreenType other) => _ordinal <= other._ordinal;
 }
 
-enum RefinedSize { small, normal, large, extraLarge }
+enum RefinedSize {
+  small,
+  normal,
+  large,
+  extraLarge;
+
+  bool operator >(RefinedSize other) => index > other.index;
+
+  bool operator >=(RefinedSize other) => index >= other.index;
+
+  bool operator <(RefinedSize other) => index < other.index;
+
+  bool operator <=(RefinedSize other) => index <= other.index;
+}