Move isOnlyEmoji utility function into String extension

Signed-off-by: Sahil Kumar <[email protected]>

lib/src/extension.dart

@@ -1,7 +1,28 @@
+import 'package:emojis/emoji.dart';
+import 'package:characters/characters.dart';
+
+final _emojis = Emoji.all();
+
 extension StringExtension on String {
   String capitalize() {
     return "${this[0].toUpperCase()}${this.substring(1)}";
   }
+
+  //  Emojis guidelines
+  //  1 to 3 emojis: big size with no text bubble.
+  //  4+ emojis or emojis+text: standard size with text bubble.
+  bool get isOnlyEmoji {
+    final characters = this.trim().characters;
+    if (characters.isEmpty) return false;
+    if (characters.length > 3) return false;
+    return characters.every((c) {
+      return _emojis.firstWhere(
+            (Emoji emoji) => emoji.char.contains(c),
+            orElse: () => null,
+          ) !=
+          null;
+    });
+  }
 }
 
 /// List extension

lib/src/message_list_view.dart

@@ -17,6 +17,7 @@ import '../stream_chat_flutter.dart';
 import 'date_divider.dart';
 import 'stream_channel.dart';
 import 'swipeable.dart';
+import 'extension.dart';
 
 typedef MessageBuilder = Widget Function(
   BuildContext,
@@ -708,7 +709,7 @@ class _MessageListViewState extends State<MessageListView> {
     Message message,
   ) {
     final isMyMessage = message.user.id == StreamChat.of(context).user.id;
-    final isOnlyEmoji = textIsOnlyEmoji(message.text);
+    final isOnlyEmoji = message.text.isOnlyEmoji;
 
     return MessageWidget(
       showThreadReplyIndicator: false,
@@ -808,7 +809,7 @@ class _MessageListViewState extends State<MessageListView> {
 
     final showInChannelIndicator = !_isThreadConversation && isThreadMessage;
     final showThreadReplyIndicator = !_isThreadConversation && hasReplies;
-    final isOnlyEmoji = textIsOnlyEmoji(message.text);
+    final isOnlyEmoji = message.text.isOnlyEmoji;
 
     Widget child = MessageWidget(
       key: ValueKey<String>('MESSAGE-${message.id}'),

lib/src/message_widget.dart

@@ -938,7 +938,7 @@ class _MessageWidgetState extends State<MessageWidget> {
     );
   }
 
-  bool get isOnlyEmoji => textIsOnlyEmoji(widget.message.text);
+  bool get isOnlyEmoji => widget.message.text.isOnlyEmoji;
 
   Color _getBackgroundColor() {
     if (hasQuotedMessage) {

lib/src/quoted_message_widget.dart

@@ -125,7 +125,7 @@ class QuotedMessageWidget extends StatelessWidget {
   }
 
   Widget _buildMessage(BuildContext context) {
-    final isOnlyEmoji = textIsOnlyEmoji(message.text);
+    final isOnlyEmoji = message.text.isOnlyEmoji;
     var msg = _hasAttachments && !_containsText
         ? message.copyWith(text: message.attachments.last?.title ?? '')
         : message;

lib/src/utils.dart

@@ -1,4 +1,3 @@
-import 'package:emojis/emoji.dart';
 import 'package:flutter/material.dart';
 import 'package:stream_chat/stream_chat.dart';
 import 'package:url_launcher/url_launcher.dart';
@@ -215,16 +214,3 @@ StreamSvgIcon getFileTypeImage(String type) {
       break;
   }
 }
-
-final _emojis = Emoji.all();
-
-bool textIsOnlyEmoji(String text) {
-  return text.trim().characters.isNotEmpty &&
-      text.trim().characters.every((c) =>
-          _emojis.firstWhere(
-            (Emoji emoji) => emoji.char.contains(c),
-            orElse: () => null,
-          ) !=
-          null) &&
-      text.characters.length < 4;
-}