Add open & closing callback listener

README.md

@@ -62,7 +62,10 @@ Example:
 Slidable(
   // Specify a key if the Slidable is dismissible.
   key: const ValueKey(0),
-
+  // Listen slider open status
+  onOpen: (bool status) {
+    // print(status);
+  },
   // The start action pane is the one at the left or the top side.
   startActionPane: ActionPane(
     // A motion is a widget used to control how the pane animates.

example/lib/main.dart

@@ -18,7 +18,10 @@ class MyApp extends StatelessWidget {
             Slidable(
               // Specify a key if the Slidable is dismissible.
               key: const ValueKey(0),
-
+              // Listen slider open status
+              onOpen: (bool status) {
+                // print(status);
+              },
               // The start action pane is the one at the left or the top side.
               startActionPane: ActionPane(
                 // A motion is a widget used to control how the pane animates.

lib/src/slidable.dart

@@ -21,6 +21,7 @@ class Slidable extends StatefulWidget {
     Key? key,
     this.groupTag,
     this.enabled = true,
+    this.onOpen,
     this.closeOnScroll = true,
     this.startActionPane,
     this.endActionPane,
@@ -37,6 +38,9 @@ class Slidable extends StatefulWidget {
   /// Defaults to true.
   final bool enabled;
 
+  /// Notify when slide open or close
+  final ValueChanged<bool>? onOpen;
+
   /// Specifies to close this [Slidable] after the closest [Scrollable]'s
   /// position changed.
   ///
@@ -178,6 +182,7 @@ class _SlidableState extends State<Slidable>
   }
 
   void handleActionPanelTypeChanged() {
+    widget.onOpen?.call(!controller.closing);
     setState(() {
       updateMoveAnimation();
     });