Create struct for history undo/redo result

lib/src/models/documents/document.dart

@@ -3,6 +3,7 @@ import 'dart:async';
 import '../quill_delta.dart';
 import '../rules/rule.dart';
 import '../structs/doc_change.dart';
+import '../structs/history_changed.dart';
 import '../structs/offset_value.dart';
 import '../structs/segment_leaf_node.dart';
 import 'attribute.dart';
@@ -277,11 +278,11 @@ class Document {
     _history.handleDocChange(change);
   }
 
-  Tuple2 undo() {
+  HistoryChanged undo() {
     return _history.undo(this);
   }
 
-  Tuple2 redo() {
+  HistoryChanged redo() {
     return _history.redo(this);
   }
 

lib/src/models/documents/history.dart

@@ -1,5 +1,6 @@
 import '../quill_delta.dart';
 import '../structs/doc_change.dart';
+import '../structs/history_changed.dart';
 import 'document.dart';
 
 class History {
@@ -84,9 +85,9 @@ class History {
     }
   }
 
-  Tuple2 _change(Document doc, List<Delta> source, List<Delta> dest) {
+  HistoryChanged _change(Document doc, List<Delta> source, List<Delta> dest) {
     if (source.isEmpty) {
-      return const Tuple2(false, 0);
+      return const HistoryChanged(false, 0);
     }
     final delta = source.removeLast();
     // look for insert or delete
@@ -106,14 +107,14 @@ class History {
     ignoreChange = true;
     doc.compose(delta, ChangeSource.LOCAL);
     ignoreChange = false;
-    return Tuple2(true, len);
+    return HistoryChanged(true, len);
   }
 
-  Tuple2 undo(Document doc) {
+  HistoryChanged undo(Document doc) {
     return _change(doc, stack.undo, stack.redo);
   }
 
-  Tuple2 redo(Document doc) {
+  HistoryChanged redo(Document doc) {
     return _change(doc, stack.redo, stack.undo);
   }
 }

lib/src/models/structs/history_changed.dart

@@ -0,0 +1,9 @@
+class HistoryChanged {
+  const HistoryChanged(
+    this.changed,
+    this.len,
+  );
+
+  final bool changed;
+  final int? len;
+}

lib/src/widgets/controller.dart

@@ -142,9 +142,9 @@ class QuillController extends ChangeNotifier {
   }
 
   void undo() {
-    final tup = document.undo();
+    final result = document.undo();
-    if (tup.item1) {
+    if (result.changed) {
-      _handleHistoryChange(tup.item2);
+      _handleHistoryChange(result.len);
     }
   }
 
@@ -164,9 +164,9 @@ class QuillController extends ChangeNotifier {
   }
 
   void redo() {
-    final tup = document.redo();
+    final result = document.redo();
-    if (tup.item1) {
+    if (result.changed) {
-      _handleHistoryChange(tup.item2);
+      _handleHistoryChange(result.len);
     }
   }