Dirty selection implementation is back

app/src/main/java/com/paktalin/vocabularynotebook/ui/MyItemDetailsLookup.kt

+package com.paktalin.vocabularynotebook.ui
+
+import android.view.MotionEvent
+import androidx.recyclerview.selection.ItemDetailsLookup
+import androidx.recyclerview.widget.RecyclerView
+
+class MyItemDetailsLookup(private val recyclerView: RecyclerView) :
+        ItemDetailsLookup<Long>() {
+    override fun getItemDetails(event: MotionEvent): ItemDetails<Long>? {
+        val view = recyclerView.findChildViewUnder(event.x, event.y)
+        if (view != null) {
+            return (recyclerView.getChildViewHolder(view) as ViewHolder)
+                    .getItemDetails()
+        }
+        return null
+    }
+}
\ No newline at end of file

app/src/main/java/com/paktalin/vocabularynotebook/ui/activities/MainActivity.kt

@@ -9,8 +9,12 @@ import android.view.WindowManager
 import android.view.inputmethod.InputMethodManager
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.SearchView
+import androidx.recyclerview.selection.SelectionPredicates
 import androidx.recyclerview.selection.SelectionTracker
+import androidx.recyclerview.selection.StableIdKeyProvider
+import androidx.recyclerview.selection.StorageStrategy
 import com.paktalin.vocabularynotebook.R
+import com.paktalin.vocabularynotebook.ui.recycler_view.MyItemDetailsLookup
 import com.paktalin.vocabularynotebook.ui.recycler_view.VocabularyAdapter
 import com.paktalin.vocabularynotebook.ui.views.LockableLayoutManager
 import com.paktalin.vocabularynotebook.utils.*
@@ -84,12 +88,21 @@ class MainActivity : AppCompatActivity() {
         addProgressBar(supportFragmentManager, R.id.container_main)
         FirestoreManager().extractVocabularyId({
             recyclerView.layoutManager = LockableLayoutManager(this@MainActivity)
-            recyclerView.adapter = VocabularyAdapter(VocabSet(mutableListOf()), this@MainActivity)
             FirestoreManager().extractVocabulary { querySnapshot ->
                 run {
                     if (querySnapshot != null && !querySnapshot.isEmpty) {
                         vocabularyAdapter = VocabularyAdapter(VocabSet.createFromSnapshot(querySnapshot), this@MainActivity)
                         recyclerView.adapter = vocabularyAdapter
+                        tracker = SelectionTracker.Builder<Long>(
+                                "mySelection",
+                                recyclerView,
+                                StableIdKeyProvider(recyclerView),
+                                MyItemDetailsLookup(recyclerView),
+                                StorageStrategy.createLongStorage()
+                        ).withSelectionPredicate(
+                                SelectionPredicates.createSelectAnything()
+                        ).build()
+                        (recyclerView.adapter as VocabularyAdapter).tracker = tracker
 
                     } else showToastNoWords()
                 }

app/src/main/java/com/paktalin/vocabularynotebook/ui/recycler_view/VocabularyAdapter.kt

@@ -7,7 +7,6 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.appcompat.widget.PopupMenu
-import androidx.recyclerview.selection.Selection
 import androidx.recyclerview.selection.SelectionTracker
 import androidx.recyclerview.widget.RecyclerView
 import com.paktalin.vocabularynotebook.R
@@ -16,18 +15,15 @@ import com.paktalin.vocabularynotebook.ui.activities.MainActivity
 import com.paktalin.vocabularynotebook.ui.fragments.EditWordFragment
 import com.paktalin.vocabularynotebook.utils.Log
 import com.paktalin.vocabularynotebook.utils.addFragment
-import com.paktalin.vocabularynotebook.utils.gone
-import com.paktalin.vocabularynotebook.utils.visible
 import com.paktalin.vocabularynotebook.vocabulary.ModifiedVocabulary
 import com.paktalin.vocabularynotebook.vocabulary.Sort
 import com.paktalin.vocabularynotebook.vocabulary.VocabSet
-import kotlinx.android.synthetic.main.content_main.*
 
 class VocabularyAdapter(private val vocabulary: VocabSet, private val mainActivity: MainActivity) : RecyclerView.Adapter<ViewHolder>() {
 
     private lateinit var recyclerView: RecyclerView
     private lateinit var viewHolder: ViewHolder
-    private var tracker: SelectionTracker<Long>? = null
+    var tracker: SelectionTracker<Long>? = null
 
     init {
         setHasStableIds(true)
@@ -44,7 +40,6 @@ class VocabularyAdapter(private val vocabulary: VocabSet, private val mainActivi
     override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {
         super.onAttachedToRecyclerView(recyclerView)
         this.recyclerView = recyclerView
-        this.tracker = initializeTracker(recyclerView) { s -> wordsSelected(s) }
         mainActivity.searchView.setOnQueryTextListener(OnQueryTextListener(this@VocabularyAdapter))
     }
 
@@ -134,17 +129,6 @@ class VocabularyAdapter(private val vocabulary: VocabSet, private val mainActivi
         return vocabulary.getModified()
     }
 
-    private fun wordsSelected(selection: Selection<Long>) {
-        if (selection.isEmpty)
-            gone(mainActivity.btnSubmitLayout)
-        else {
-            visible(mainActivity.btnSubmitLayout)
-            mainActivity.btnSubmit.setOnClickListener {
-                // TODO add tag to the words
-            }
-        }
-    }
-
     companion object {
         private val TAG = "VN/" + VocabularyAdapter::class.java.simpleName
     }