Unable to support youtube video

example/assets/sample_data.json

@@ -19,7 +19,7 @@
    },
    {
       "insert": {
-         "video": "https://www.youtube.com/watch?v=V4hgdKhIqtc&list=PLbhaS_83B97s78HsDTtplRTEhcFsqSqIK&index=1"
+         "video": "https://sample-videos.com/video123/mp4/720/big_buck_bunny_720p_20mb.mp4"
       }
    },
    {

lib/src/models/documents/document.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:collection';
 
 import 'package:tuple/tuple.dart';
 
@@ -209,16 +210,19 @@ class Document {
 
   static void _autoAppendNewlineAfterImage(
       int i, List<Operation> ops, Operation op, Delta res) {
-    final nextOpIsImage =
-        i + 1 < ops.length && ops[i + 1].isInsert && ops[i + 1].data is! String;
+    final nextOpIsImage = i + 1 < ops.length &&
+        ops[i + 1].isInsert &&
+        ops[i + 1].data is Map &&
+        (ops[i + 1].data as Map).containsKey('image');
     if (nextOpIsImage &&
         op.data is String &&
         (op.data as String).isNotEmpty &&
         !(op.data as String).endsWith('\n')) {
       res.push(Operation.insert('\n'));
     }
-    // Currently embed is equivalent to image and hence `is! String`
-    final opInsertImage = op.isInsert && op.data is! String;
+    // embed could be image or video
+    final opInsertImage =
+        op.isInsert && op.data is Map && (op.data as Map).containsKey('image');
     final nextOpIsLineBreak = i + 1 < ops.length &&
         ops[i + 1].isInsert &&
         ops[i + 1].data is String &&

lib/src/widgets/editor.dart

@@ -25,6 +25,7 @@ import 'delegate.dart';
 import 'image.dart';
 import 'raw_editor.dart';
 import 'text_selection.dart';
+import 'video_app.dart';
 
 const linkPrefixes = [
   'mailto:', // email
@@ -105,6 +106,9 @@ Widget _defaultEmbedBuilder(BuildContext context, leaf.Embed node) {
           : isBase64(imageUrl)
               ? Image.memory(base64.decode(imageUrl))
               : Image.file(io.File(imageUrl));
+    case 'video':
+      final videoUrl = node.value.data;
+      return VideoApp(videoUrl: videoUrl);
     default:
       throw UnimplementedError(
         'Embeddable type "${node.value.type}" is not supported by default '