refactor : add custom functions inside FloatingSearchBarAction

lib/src/floating_search_bar_actions.dart

@@ -20,6 +20,8 @@ class FloatingSearchBarAction extends StatelessWidget {
     this.builder,
     this.showIfOpened = false,
     this.showIfClosed = true,
+    this.runCustomFunction = false,
+    this.customFunction
   }) : assert(builder != null || child != null);
 
   /// A hamburger menu that when tapped opens the [Drawer]
@@ -81,6 +83,8 @@ class FloatingSearchBarAction extends StatelessWidget {
     Duration duration = const Duration(milliseconds: 900),
     String searchButtonSemanticLabel = 'Search',
     String clearButtonSemanticLabel = 'Clear',
+    bool runCustomFunction = false,
+    void Function()? customFunction,
   }) {
     return FloatingSearchBarAction(
       showIfOpened: true,
@@ -101,6 +105,9 @@ class FloatingSearchBarAction extends StatelessWidget {
               onTap: () {
                 if (!isEmpty) {
                   bar.clear();
+                  if (runCustomFunction == true) {
+                    customFunction!;
+                  }
                 } else {
                   bar.isOpen =
                       !bar.isOpen || (!bar.hasFocus && bar.isAlwaysOpened);
@@ -196,6 +203,10 @@ class FloatingSearchBarAction extends StatelessWidget {
   /// and when closed.
   bool get isAlwaysShown => showIfOpened && showIfClosed;
 
+  final bool runCustomFunction;
+
+  final void Function()? customFunction;
+
   @override
   Widget build(BuildContext context) {
     return child ??