swipe to left to delete from history

app/src/main/java/com/github/libretube/adapters/WatchHistoryAdapter.kt

@@ -20,6 +20,12 @@ class WatchHistoryAdapter(
     RecyclerView.Adapter<WatchHistoryViewHolder>() {
     private val TAG = "WatchHistoryAdapter"
 
+    fun removeFromWatchHistory(position: Int) {
+        PreferenceHelper.removeFromWatchHistory(position)
+        watchHistory.removeAt(position)
+        notifyDataSetChanged()
+    }
+
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): WatchHistoryViewHolder {
         val layoutInflater = LayoutInflater.from(parent.context)
         val binding = WatchHistoryRowBinding.inflate(layoutInflater, parent, false)
@@ -41,9 +47,7 @@ class WatchHistoryAdapter(
             }
 
             deleteBTN.setOnClickListener {
-                PreferenceHelper.removeFromWatchHistory(video.videoId!!)
-                watchHistory.removeAt(position)
-                notifyDataSetChanged()
+                removeFromWatchHistory(position)
             }
 
             root.setOnClickListener {

app/src/main/java/com/github/libretube/fragments/WatchHistoryFragment.kt

@@ -4,7 +4,9 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 import com.github.libretube.adapters.WatchHistoryAdapter
 import com.github.libretube.databinding.FragmentWatchHistoryBinding
 import com.github.libretube.extensions.BaseFragment
@@ -28,18 +30,56 @@ class WatchHistoryFragment : BaseFragment() {
 
         val watchHistory = PreferenceHelper.getWatchHistory()
 
-        if (watchHistory.isNotEmpty()) {
-            val watchHistoryAdapter = WatchHistoryAdapter(watchHistory, childFragmentManager)
-            binding.watchHistoryRecView.adapter = watchHistoryAdapter
-            binding.historyEmpty.visibility = View.GONE
-            binding.watchHistoryRecView.visibility = View.VISIBLE
+        if (watchHistory.isEmpty()) return
+
+        // reversed order
+        binding.watchHistoryRecView.layoutManager = LinearLayoutManager(requireContext()).apply {
+            reverseLayout = true
+            stackFromEnd = true
         }
 
-        // reverse order
-        val linearLayoutManager = LinearLayoutManager(view.context)
-        linearLayoutManager.reverseLayout = true
-        linearLayoutManager.stackFromEnd = true
+        val watchHistoryAdapter = WatchHistoryAdapter(
+            watchHistory,
+            childFragmentManager
+        )
 
-        binding.watchHistoryRecView.layoutManager = linearLayoutManager
+        val itemTouchCallback = object : ItemTouchHelper.SimpleCallback(
+            0,
+            ItemTouchHelper.LEFT
+        ) {
+            override fun onMove(
+                recyclerView: RecyclerView,
+                viewHolder: RecyclerView.ViewHolder,
+                target: RecyclerView.ViewHolder
+            ): Boolean {
+                return false
+            }
+
+            override fun onSwiped(
+                viewHolder: RecyclerView.ViewHolder,
+                direction: Int
+            ) {
+                val position = viewHolder.absoluteAdapterPosition
+                watchHistoryAdapter.removeFromWatchHistory(position)
+            }
+        }
+
+        val itemTouchHelper = ItemTouchHelper(itemTouchCallback)
+        itemTouchHelper.attachToRecyclerView(binding.watchHistoryRecView)
+
+        // observe changes
+        watchHistoryAdapter.registerAdapterDataObserver(object :
+                RecyclerView.AdapterDataObserver() {
+                override fun onChanged() {
+                    if (watchHistoryAdapter.itemCount == 0) {
+                        binding.watchHistoryRecView.visibility = View.GONE
+                        binding.historyEmpty.visibility = View.VISIBLE
+                    }
+                }
+            })
+
+        binding.watchHistoryRecView.adapter = watchHistoryAdapter
+        binding.historyEmpty.visibility = View.GONE
+        binding.watchHistoryRecView.visibility = View.VISIBLE
     }
 }

app/src/main/java/com/github/libretube/preferences/PreferenceHelper.kt

@@ -159,11 +159,18 @@ object PreferenceHelper {
         watchHistory.forEachIndexed { index, item ->
             if (item.videoId == videoId) indexToRemove = index
         }
-        if (indexToRemove != null) {
-            watchHistory.removeAt(indexToRemove!!)
-            val json = mapper.writeValueAsString(watchHistory)
-            editor.putString("watch_history", json).commit()
-        }
+        if (indexToRemove == null) return
+        watchHistory.removeAt(indexToRemove!!)
+        val json = mapper.writeValueAsString(watchHistory)
+        editor.putString("watch_history", json).commit()
+    }
+
+    fun removeFromWatchHistory(position: Int) {
+        val watchHistory = getWatchHistory()
+        watchHistory.removeAt(position)
+
+        val json = mapper.writeValueAsString(watchHistory)
+        editor.putString("watch_history", json).commit()
     }
 
     fun getWatchHistory(): ArrayList<WatchHistoryItem> {