From 16487338558a56d1c7f0973e163c3b90a5a1e693 Mon Sep 17 00:00:00 2001
From: Rohit Bhoite <rohit.bhoite@deiglobal.com>
Date: Fri, 21 Nov 2025 15:50:21 +0530
Subject: [PATCH] Combobox open close event scenario handled

---
 lib/src/controls/form/combo_box.dart          | 10 +++++++++-
 lib/src/controls/form/editable_combo_box.dart |  4 ++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/src/controls/form/combo_box.dart b/lib/src/controls/form/combo_box.dart
index a999c751d..2edb66573 100644
--- a/lib/src/controls/form/combo_box.dart
+++ b/lib/src/controls/form/combo_box.dart
@@ -917,6 +917,7 @@ class ComboBox<T> extends StatefulWidget {
     this.focusNode,
     this.autofocus = false,
     this.popupColor,
+    this.onOpenChanged,
     // When adding new arguments, consider adding similar arguments to
     // ComboBoxFormField.
   });
@@ -971,6 +972,12 @@ class ComboBox<T> extends StatefulWidget {
   /// The callback will not be invoked if the combo box button is disabled.
   final VoidCallback? onTap;
 
+  /// Called when the dropdown opens or closes.
+  ///
+  /// This callback is invoked with `true` when the dropdown is shown
+  /// and `false` when it's hidden.
+  final ValueChanged<bool>? onOpenChanged;
+
   /// A builder to customize the combo box buttons corresponding to the
   /// [ComboBoxItem]s in [items].
   ///
@@ -1155,6 +1162,7 @@ class ComboBoxState<T> extends State<ComboBox<T>> {
   void closePopup() {
     _comboboxRoute?._dismiss();
     _comboboxRoute = null;
+    widget.onOpenChanged?.call(false);
   }
 
   void _handleFocusChanged() {
@@ -1232,7 +1240,7 @@ class ComboBoxState<T> extends State<ComboBox<T>> {
       barrierLabel: FluentLocalizations.of(context).modalBarrierDismissLabel,
       popupColor: widget.popupColor,
     );
-
+    widget.onOpenChanged?.call(true);
     navigator.push(_comboboxRoute!).then<void>((
       _ComboBoxRouteResult<T>? newValue,
     ) {
diff --git a/lib/src/controls/form/editable_combo_box.dart b/lib/src/controls/form/editable_combo_box.dart
index 879e4c99f..070071bb3 100644
--- a/lib/src/controls/form/editable_combo_box.dart
+++ b/lib/src/controls/form/editable_combo_box.dart
@@ -27,6 +27,7 @@ class EditableComboBox<T> extends ComboBox<T> {
     super.items,
     super.onChanged,
     super.onTap,
+    super.onOpenChanged,
     super.placeholder,
     super.selectedItemBuilder,
     super.style,
@@ -231,6 +232,7 @@ class ComboboxFormField<T> extends FormField<T> {
     Widget? disabledPlaceholder,
     required this.onChanged,
     VoidCallback? onTap,
+    ValueChanged<bool>? onOpenChanged,
     int elevation = 8,
     TextStyle? style,
     Widget icon = const WindowsIcon(WindowsIcons.chevron_down),
@@ -278,6 +280,7 @@ class ComboboxFormField<T> extends FormField<T> {
                        disabledPlaceholder: disabledPlaceholder,
                        onChanged: onChanged == null ? null : state.didChange,
                        onTap: onTap,
+                       onOpenChanged: onOpenChanged,
                        elevation: elevation,
                        style: style,
                        icon: icon,
@@ -353,6 +356,7 @@ class EditableComboboxFormField<T> extends FormField<T> {
     Widget? placeholder,
     Widget? disabledPlaceholder,
     required this.onChanged,
+    ValueChanged<bool>? onOpenChanged,
     VoidCallback? onTap,
     int elevation = 8,
     TextStyle? style,