From 3c27af43bb72a95cb9de1f27b3a31b6574d2c41e Mon Sep 17 00:00:00 2001
From: "re:fi.64" <hello@refi64.dev>
Date: Thu, 17 Jul 2025 20:31:59 -0500
Subject: [PATCH] fix: Selected index not updating when items change

If the valueListenable is set *separately* from the items changing, the
selected item wouldn't change, which can cause issues if they're e.g.
loaded in separately.

Fixes: #392
---
 packages/dropdown_button2/lib/src/dropdown_button2.dart | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/packages/dropdown_button2/lib/src/dropdown_button2.dart b/packages/dropdown_button2/lib/src/dropdown_button2.dart
index 89d082b..df7454d 100644
--- a/packages/dropdown_button2/lib/src/dropdown_button2.dart
+++ b/packages/dropdown_button2/lib/src/dropdown_button2.dart
@@ -511,6 +511,11 @@ class _DropdownButton2State<T> extends State<DropdownButton2<T>> with WidgetsBin
       oldWidget.multiValueListenable?.removeListener(_updateSelectedIndex);
       widget.valueListenable?.addListener(_updateSelectedIndex);
       widget.multiValueListenable?.addListener(_updateSelectedIndex);
+    } else if (widget.items?.length != oldWidget.items?.length ||
+        Iterable<int>.generate(widget.items?.length ?? 0).any((i) =>
+            widget.items![i].enabled != oldWidget.items![i].enabled ||
+            widget.items![i].value != oldWidget.items![i].value)) {
+      _updateSelectedIndex();
     }
 
     if (widget.openDropdownListenable != oldWidget.openDropdownListenable) {