Add on swap

example/android/build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.6.10'
+    ext.kotlin_version = '1.7.0'
     repositories {
         google()
         mavenCentral()
@@ -26,6 +26,6 @@ subprojects {
     project.evaluationDependsOn(':app')
 }
 
-task clean(type: Delete) {
+tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }

example/lib/main.dart

@@ -26,6 +26,11 @@ class _MyAppState extends State<MyApp> with SingleTickerProviderStateMixin {
               // Specify a key if the Slidable is dismissible.
               key: const ValueKey(0),
 
+              // You can access the DragUpdateDetails value
+              onSwap: (detail) {
+                print(detail);
+              },
+
               // 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/gesture_detector.dart

@@ -13,10 +13,12 @@ class SlidableGestureDetector extends StatefulWidget {
     required this.controller,
     required this.direction,
     required this.child,
+    this.onSwap,
     this.dragStartBehavior = DragStartBehavior.start,
   });
 
   final SlidableController controller;
+  final void Function(DragUpdateDetails detail)? onSwap;
   final Widget child;
   final Axis direction;
   final bool enabled;
@@ -88,6 +90,7 @@ class _SlidableGestureDetectorState extends State<SlidableGestureDetector> {
     dragExtent += delta;
     lastPosition = details.localPosition;
     widget.controller.ratio = dragExtent / overallDragAxisExtent;
+    widget.onSwap?.call(details);
   }
 
   void handleDragEnd(DragEndDetails details) {

lib/src/slidable.dart

@@ -1,3 +1,5 @@
+// ignore_for_file: public_member_api_docs
+
 import 'package:flutter/gestures.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_slidable/src/auto_close_behavior.dart';
@@ -28,9 +30,15 @@ class Slidable extends StatefulWidget {
     this.direction = Axis.horizontal,
     this.dragStartBehavior = DragStartBehavior.down,
     this.useTextDirection = true,
+    this.onSwap,
     required this.child,
   });
 
+  /// You can find out if the item is being [swapped] or not
+  ///
+  /// You also have the [DragUpdateDetails] value
+  final void Function(DragUpdateDetails detail)? onSwap;
+
   /// The Slidable widget controller.
   final SlidableController? controller;
 
@@ -274,6 +282,7 @@ class _SlidableState extends State<Slidable>
       controller: controller,
       direction: widget.direction,
       dragStartBehavior: widget.dragStartBehavior,
+      onSwap: widget.onSwap,
       child: SlidableNotificationSender(
         tag: widget.groupTag,
         controller: controller,