swipe to delete added

Author: ShakilAhmedShaj

app/src/main/java/com/decimalab/todokotlin/fragments/list/ListFragment.kt

@@ -7,11 +7,16 @@ import android.widget.Toast
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.viewModels
 import androidx.lifecycle.Observer
+import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 import com.decimalab.todokotlin.R
+import com.decimalab.todokotlin.data.models.ToDoData
 import com.decimalab.todokotlin.data.viewmodel.ToDoViewModel
 import com.decimalab.todokotlin.databinding.FragmentListBinding
 import com.decimalab.todokotlin.fragments.BaseViewModel
+import com.decimalab.todokotlin.fragments.list.adapter.ListAdapter
+import com.google.android.material.snackbar.Snackbar
 
 class ListFragment : Fragment() {
 
@@ -53,6 +58,41 @@ class ListFragment : Fragment() {
         val recyclerView = binding.recyclerView
         recyclerView.adapter = adapter
         recyclerView.layoutManager = LinearLayoutManager(requireActivity())
+
+        swipeToDelete(recyclerView)
+    }
+
+    private fun swipeToDelete(recyclerView: RecyclerView) {
+        val swipeToDeleteCallback = object : SwipeToDelete() {
+            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
+                val deletedItem = adapter.dataList[viewHolder.adapterPosition]
+                // Delete Item
+                mToDoViewModel.deleteItem(deletedItem)
+
+                Toast.makeText(
+                    requireContext(),
+                    "Deleted",
+                    Toast.LENGTH_SHORT
+                ).show()
+
+                adapter.notifyItemRemoved(viewHolder.adapterPosition)
+                // Restore Deleted Item
+                restoreDeletedData(viewHolder.itemView, deletedItem)
+            }
+        }
+        val itemTouchHelper = ItemTouchHelper(swipeToDeleteCallback)
+        itemTouchHelper.attachToRecyclerView(recyclerView)
+    }
+
+    private fun restoreDeletedData(view: View, deletedItem: ToDoData) {
+        val snackBar = Snackbar.make(
+            view, "Deleted '${deletedItem.title}'",
+            Snackbar.LENGTH_LONG
+        )
+        snackBar.setAction("Undo") {
+            mToDoViewModel.insertData(deletedItem)
+        }
+        snackBar.show()
     }
 
     override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {

app/src/main/java/com/decimalab/todokotlin/fragments/list/SwipeToDelete.kt

@@ -0,0 +1,18 @@
+package com.decimalab.todokotlin.fragments.list
+
+import androidx.recyclerview.widget.ItemTouchHelper
+import androidx.recyclerview.widget.RecyclerView
+
+/**
+ * Created by Shakil Ahmed Shaj on 31,August,2020.
+ * shakilahmedshaj@gmail.com
+ */
+abstract class SwipeToDelete : ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {
+    override fun onMove(
+        recyclerView: RecyclerView,
+        viewHolder: RecyclerView.ViewHolder,
+        target: RecyclerView.ViewHolder
+    ): Boolean {
+        return false
+    }
+}

app/src/main/java/com/decimalab/todokotlin/fragments/list/ListAdapter.kt renamed to app/src/main/java/com/decimalab/todokotlin/fragments/list/adapter/ListAdapter.kt

@@ -1,4 +1,4 @@
-package com.decimalab.todokotlin.fragments.list
+package com.decimalab.todokotlin.fragments.list.adapter
 
 import android.view.LayoutInflater
 import android.view.ViewGroup
@@ -13,7 +13,7 @@ import com.decimalab.todokotlin.databinding.RowLayoutBinding
 class ListAdapter : RecyclerView.Adapter<ListAdapter.MyViewHolder>() {
 
 
-    private var dataList = emptyList<ToDoData>()
+    var dataList = emptyList<ToDoData>()
 
 
     class MyViewHolder(private val binding: RowLayoutBinding) :