TF-313 Apply new ui for subject, address, body EmailView

model/lib/email/prefix_email_address.dart

@@ -1,5 +1,6 @@
 
 enum PrefixEmailAddress {
+  from,
   to,
   cc,
   bcc

model/lib/extensions/email_address_extension.dart

@@ -1,6 +1,9 @@
+import 'dart:ui';
+
 import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
 import 'package:model/email/email_address_cache.dart';
 import 'package:core/core.dart';
+import 'package:collection/collection.dart';
 
 extension EmailAddressExtension on EmailAddress {
 
@@ -33,4 +36,20 @@ extension EmailAddressExtension on EmailAddress {
   String get displayName => name ?? '';
 
   EmailAddressCache toEmailAddressCache() => EmailAddressCache(displayName, emailAddress);
+
+  List<Color> get avatarColors {
+    return AppColor.mapGradientColor[_generateIndex()];
+  }
+
+  int _generateIndex() {
+    if (emailAddress.isNotEmpty) {
+      final codeUnits = emailAddress.codeUnits;
+      if (codeUnits.isNotEmpty) {
+        final sumCodeUnits = codeUnits.sum;
+        final index = sumCodeUnits % AppColor.mapGradientColor.length;
+        return index;
+      }
+    }
+    return 0;
+  }
 }

model/lib/extensions/presentation_email_extension.dart

@@ -6,24 +6,11 @@ import 'package:dartz/dartz.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
 import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
 import 'package:model/model.dart';
-import 'package:collection/collection.dart';
 
 extension PresentationEmailExtension on PresentationEmail {
 
   List<Color> get avatarColors {
-    return AppColor.mapGradientColor[_generateIndexFromSender()];
-  }
-
-  int _generateIndexFromSender() {
-    if (from != null && from?.isNotEmpty == true) {
-      final codeUnits = from?.first.email?.codeUnits ?? List.empty();
-      if (codeUnits.isNotEmpty) {
-        final sumCodeUnits = codeUnits.sum;
-        final index = sumCodeUnits % AppColor.mapGradientColor.length;
-        return index;
-      }
-    }
-    return 0;
+    return from?.first.avatarColors ?? AppColor.mapGradientColor.first;
   }
 
   int numberOfAllEmailAddress() => to.numberEmailAddress() + cc.numberEmailAddress() + bcc.numberEmailAddress();