From 7c7f61fe90b45ebb35f99a308c289c417fbdcdb1 Mon Sep 17 00:00:00 2001
From: kevinDespoulains <46108869+kevinDespoulains@users.noreply.github.com>
Date: Tue, 31 Aug 2021 18:10:08 +0200
Subject: [PATCH] Option added to controller to keep inline style on new lines
 (#372)

Co-authored-by: Kevin Despoulains <kevin.despoulains@scriptandgo.com>
---
 lib/src/widgets/controller.dart | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/lib/src/widgets/controller.dart b/lib/src/widgets/controller.dart
index f26765b0..7d2e0714 100644
--- a/lib/src/widgets/controller.dart
+++ b/lib/src/widgets/controller.dart
@@ -14,7 +14,9 @@ class QuillController extends ChangeNotifier {
   QuillController({
     required this.document,
     required TextSelection selection,
-  }) : _selection = selection;
+    bool keepStyleOnNewLine = false,
+  })  : _selection = selection,
+        _keepStyleOnNewLine = keepStyleOnNewLine;
 
   factory QuillController.basic() {
     return QuillController(
@@ -26,6 +28,10 @@ class QuillController extends ChangeNotifier {
   /// Document managed by this controller.
   final Document document;
 
+  /// Tells whether to keep or reset the [toggledStyle]
+  /// when user adds a new line.
+  final bool _keepStyleOnNewLine;
+
   /// Currently selected text within the [document].
   TextSelection get selection => _selection;
   TextSelection _selection;
@@ -135,7 +141,14 @@ class QuillController extends ChangeNotifier {
       }
     }
 
-    toggledStyle = Style();
+    if (_keepStyleOnNewLine) {
+      final style = getSelectionStyle();
+      final notInlineStyle = style.attributes.values.where((s) => !s.isInline);
+      toggledStyle = style.removeAll(notInlineStyle.toSet());
+    } else {
+      toggledStyle = Style();
+    }
+
     if (textSelection != null) {
       if (delta == null || delta.isEmpty) {
         _updateSelection(textSelection, ChangeSource.LOCAL);