Swipe events for SwipeDrawer behaviour

app/src/main/java/com/mikepenz/fastadapter/app/SwipeDrawerListActivity.kt

@@ -17,6 +17,7 @@ import com.mikepenz.fastadapter.app.adapters.IDraggableViewHolder
 import com.mikepenz.fastadapter.app.items.SwipeableDrawerItem
 import com.mikepenz.fastadapter.drag.ItemTouchCallback
 import com.mikepenz.fastadapter.drag.SimpleDragCallback
+import com.mikepenz.fastadapter.swipe.SimpleSwipeDrawerCallback
 import com.mikepenz.fastadapter.swipe_drag.SimpleSwipeDrawerDragCallback
 import com.mikepenz.fastadapter.utils.DragDropUtil
 import com.mikepenz.iconics.IconicsDrawable
@@ -27,7 +28,7 @@ import io.reactivex.functions.Consumer
 import kotlinx.android.synthetic.main.activity_sample.*
 import java.util.*
 
-class SwipeDrawerListActivity : AppCompatActivity(), ItemTouchCallback {
+class SwipeDrawerListActivity : AppCompatActivity(), ItemTouchCallback, SimpleSwipeDrawerCallback.ItemSwipeCallback {
 
     //save our FastAdapter
     private lateinit var fastItemDrawerAdapter: FastItemAdapter<SwipeableDrawerItem>
@@ -57,7 +58,6 @@ class SwipeDrawerListActivity : AppCompatActivity(), ItemTouchCallback {
     }
 
     private fun share(item: SwipeableDrawerItem) {
-        item.shareAction = null
         val position12 = fastItemDrawerAdapter.getAdapterPosition(item)
         if (position12 != RecyclerView.NO_POSITION) {
             // Do something intelligent here
@@ -108,7 +108,8 @@ class SwipeDrawerListActivity : AppCompatActivity(), ItemTouchCallback {
         //and add swipe as well
         touchCallback = SimpleSwipeDrawerDragCallback(
                 this,
-                ItemTouchHelper.LEFT)
+                ItemTouchHelper.LEFT,
+                this)
                 .withNotifyAllDrops(true)
                 .withSwipeLeft(80) // Width of delete button
                 .withSwipeRight(160) // Width of archive and share buttons
@@ -193,4 +194,15 @@ class SwipeDrawerListActivity : AppCompatActivity(), ItemTouchCallback {
     companion object {
         private val ALPHABET = arrayOf("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z")
     }
+
+    override fun itemSwiped(position: Int, direction: Int) {
+        var directionStr = ""
+        if (ItemTouchHelper.LEFT == direction) directionStr = "left"
+        else if (ItemTouchHelper.RIGHT == direction) directionStr = "right"
+        println("Item $position swiped $directionStr")
+    }
+
+    override fun itemUnswiped(position: Int) {
+        println("Item $position unswiped")
+    }
 }

library-extensions-swipe/src/main/java/com/mikepenz/fastadapter/swipe/SimpleSwipeDrawerCallback.kt

@@ -15,7 +15,7 @@ import com.mikepenz.fastadapter.IItem
 /**
  * Created by Robb on 2020-07-04.
  */
-class SimpleSwipeDrawerCallback @JvmOverloads constructor(private val swipeDirs: Int = ItemTouchHelper.LEFT) : ItemTouchHelper.SimpleCallback(0, swipeDirs) {
+class SimpleSwipeDrawerCallback @JvmOverloads constructor(private val swipeDirs: Int = ItemTouchHelper.LEFT, private val itemSwipeCallback: ItemSwipeCallback? = null) : ItemTouchHelper.SimpleCallback(0, swipeDirs) {
 
     // Swipe movement control
     private var sensitivityFactor = 1f
@@ -27,6 +27,28 @@ class SimpleSwipeDrawerCallback @JvmOverloads constructor(private val swipeDirs:
     // Indicates whether the touchTransmitter has been set on the RecyclerView
     private var touchTransmitterSet = false
 
+    // States of swiped items
+    //  Key = item position
+    //  Value = swiped direction (see {@link ItemTouchHelper})
+    private val swipedStates = HashMap<Int, Int>()
+
+    interface ItemSwipeCallback {
+
+        /**
+         * Called when a drawer has been swiped
+         *
+         * @param position  position of item in the adapter
+         * @param direction direction the item where the drawer was swiped (see {@link ItemTouchHelper})
+         */
+        fun itemSwiped(position: Int, direction: Int)
+
+        /**
+         * Called when a drawer has been un-swiped (= returns to its default position)
+         *
+         * @param position  position of item in the adapter
+         */
+        fun itemUnswiped(position: Int)
+    }
 
     /**
      * Enable swipe to the left until the given width has been reached
@@ -71,7 +93,11 @@ class SimpleSwipeDrawerCallback @JvmOverloads constructor(private val swipeDirs:
     }
 
     override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
-        // Not used
+        val position = viewHolder.adapterPosition
+        if (position != RecyclerView.NO_POSITION && (!swipedStates.containsKey(position) || swipedStates[position] != direction)) {
+            itemSwipeCallback?.itemSwiped(position, direction)
+            swipedStates[position] = direction
+        }
     }
 
     override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean {
@@ -91,14 +117,21 @@ class SimpleSwipeDrawerCallback @JvmOverloads constructor(private val swipeDirs:
             touchTransmitterSet = true
         }
 
-        if (viewHolder.adapterPosition == RecyclerView.NO_POSITION) {
-            return
-        }
+        val position = viewHolder.adapterPosition
+        if (position == RecyclerView.NO_POSITION) return
 
         if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
-            val isLeft = dX < 0
+            // Careful, dX is not the delta of user's movement, it's the new offset of the swiped view's left side !
+            val isLeftArea = dX < 0
+
+            // If unswiped, fire event and update swiped state
+            if (0f == dX && swipedStates.containsKey(position)) {
+                itemSwipeCallback?.itemUnswiped(viewHolder.adapterPosition)
+                swipedStates.remove(position)
+            }
+
             var swipeWidthPc = recyclerView.context.resources.displayMetrics.density / itemView.width
-            swipeWidthPc *= if (isLeft) swipeWidthLeftDp else swipeWidthRightDp
+            swipeWidthPc *= if (isLeftArea) swipeWidthLeftDp else swipeWidthRightDp
 
             var swipeableView = itemView
             if (viewHolder is IDrawerSwipeableViewHolder) swipeableView = viewHolder.swipeableView
@@ -111,7 +144,7 @@ class SimpleSwipeDrawerCallback @JvmOverloads constructor(private val swipeDirs:
      * Hack to force-transmit click events to the first visible View at the clicked coordinates
      * [< swiped area ] exposed sublayer ]
      * Android default touch event mechanisms don't transmit these events to the sublayer :
-     * any click on the exposed surface just swipe the item back to where it came
+     * any click on the exposed surface just swipes the item back to where it came
      */
     class RecyclerTouchTransmitter : View.OnTouchListener {
 

library-extensions-utils/src/main/java/com/mikepenz/fastadapter/swipe_drag/SimpleSwipeDrawerDragCallback.kt

@@ -14,14 +14,15 @@ import com.mikepenz.fastadapter.swipe.SimpleSwipeDrawerCallback
  */
 class SimpleSwipeDrawerDragCallback @JvmOverloads constructor(
         itemTouchCallback: ItemTouchCallback,
-        swipeDirs: Int = ItemTouchHelper.LEFT) : SimpleDragCallback(itemTouchCallback) {
+        swipeDirs: Int = ItemTouchHelper.LEFT,
+        itemSwipeCallback: SimpleSwipeDrawerCallback.ItemSwipeCallback? = null) : SimpleDragCallback(itemTouchCallback) {
 
     private val simpleSwipeCallback: SimpleSwipeDrawerCallback
     private var defaultSwipeDirs: Int = 0
 
     init {
         setDefaultSwipeDirs(swipeDirs)
-        simpleSwipeCallback = SimpleSwipeDrawerCallback(swipeDirs)
+        simpleSwipeCallback = SimpleSwipeDrawerCallback(swipeDirs, itemSwipeCallback)
     }
 
     override fun setDefaultSwipeDirs(defaultSwipeDirs: Int) {