From dfe812e837282f136568f2c03643a904b18a8c1d Mon Sep 17 00:00:00 2001
From: singerdmx <singerdmx@gmail.com>
Date: Sat, 26 Dec 2020 10:25:04 -0800
Subject: [PATCH] expose Stream<Tuple3> get changes

---
 lib/models/documents/document.dart | 2 +-
 lib/widgets/controller.dart        | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/models/documents/document.dart b/lib/models/documents/document.dart
index bd3a4372..79efcd9f 100644
--- a/lib/models/documents/document.dart
+++ b/lib/models/documents/document.dart
@@ -33,7 +33,7 @@ class Document {
 
   final History _history = History();
 
-  Stream<Tuple3> get changes => _observer.stream;
+  Stream<Tuple3<Delta, Delta, ChangeSource>> get changes => _observer.stream;
 
   Document() : _delta = Delta()
     ..insert('\n') {
diff --git a/lib/widgets/controller.dart b/lib/widgets/controller.dart
index e8fdfad5..b7b40f6b 100644
--- a/lib/widgets/controller.dart
+++ b/lib/widgets/controller.dart
@@ -7,6 +7,7 @@ import 'package:flutter_quill/models/documents/nodes/embed.dart';
 import 'package:flutter_quill/models/documents/style.dart';
 import 'package:flutter_quill/utils/diff_delta.dart';
 import 'package:quill_delta/quill_delta.dart';
+import 'package:tuple/tuple.dart';
 
 class QuillController extends ChangeNotifier {
   final Document document;
@@ -22,6 +23,13 @@ class QuillController extends ChangeNotifier {
         document: Document(), selection: TextSelection.collapsed(offset: 0));
   }
 
+  // item1: Document state before [change].
+  //
+  // item2: Change delta applied to the document.
+  //
+  // item3: The source of this change.
+  Stream<Tuple3<Delta, Delta, ChangeSource>> get changes => document.changes;
+
   TextEditingValue get plainTextEditingValue => TextEditingValue(
         text: document.toPlainText(),
         selection: selection,