From 1d9891bc4d841c633d4769952f981dcc7e8d7557 Mon Sep 17 00:00:00 2001
From: Peter <Liyong_zhang@yeah.net>
Date: Fri, 12 May 2023 12:36:10 +0800
Subject: [PATCH 1/2] Check whether a focus state transition occurs

---
 lib/src/base_spin_box.dart | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/src/base_spin_box.dart b/lib/src/base_spin_box.dart
index fd986d6..f31157d 100644
--- a/lib/src/base_spin_box.dart
+++ b/lib/src/base_spin_box.dart
@@ -52,6 +52,9 @@ mixin SpinBoxMixin<T extends BaseSpinBox> on State<T> {
   late final FocusNode _focusNode;
   late final TextEditingController _controller;
 
+  // record previous focus state
+  bool _hasFocusPrev = false;
+
   double get value => _value;
   bool get hasFocus => _focusNode.hasFocus;
   FocusNode get focusNode => _focusNode;
@@ -165,8 +168,13 @@ mixin SpinBoxMixin<T extends BaseSpinBox> on State<T> {
         _selectAll();
       } else {
         final value = fixupValue(_controller.text);
-        widget.onSubmitted?.call(value);
+        // Checking for valid state transitions is necessary
+        // because `_handleFocusChanged` is called when Spinbox are enabled
+        // or disabled.
+        if (_hasFocusPrev) widget.onSubmitted?.call(value);
       }
+
+      _hasFocusPrev = hasFocus;
     });
   }
 

From 48d1f2cb20b31e694058d9803c42e3f246af3cc0 Mon Sep 17 00:00:00 2001
From: Peter <Liyong_zhang@yeah.net>
Date: Sat, 13 May 2023 11:22:02 +0800
Subject: [PATCH 2/2] move `_hasFocusPrev` initialization to `initState`

---
 lib/src/base_spin_box.dart | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/src/base_spin_box.dart b/lib/src/base_spin_box.dart
index f31157d..379019e 100644
--- a/lib/src/base_spin_box.dart
+++ b/lib/src/base_spin_box.dart
@@ -53,7 +53,7 @@ mixin SpinBoxMixin<T extends BaseSpinBox> on State<T> {
   late final TextEditingController _controller;
 
   // record previous focus state
-  bool _hasFocusPrev = false;
+  late bool _hasFocusPrev;
 
   double get value => _value;
   bool get hasFocus => _focusNode.hasFocus;
@@ -89,6 +89,7 @@ mixin SpinBoxMixin<T extends BaseSpinBox> on State<T> {
     _controller.addListener(_updateValue);
     _focusNode = widget.focusNode ?? FocusNode();
     _focusNode.addListener(_handleFocusChanged);
+    _hasFocusPrev = hasFocus;
   }
 
   @override