Enables/disables popup menu according to the tag selection

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

@@ -9,6 +9,7 @@ import android.view.WindowManager
 import android.view.inputmethod.InputMethodManager
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.SearchView
+import androidx.recyclerview.selection.Selection
 import com.paktalin.vocabularynotebook.R
 import com.paktalin.vocabularynotebook.ui.recycler_view.VocabularyAdapter
 import com.paktalin.vocabularynotebook.ui.recycler_view.selection_tracker.MySelectionTracker
@@ -120,19 +121,20 @@ class MainActivity : AppCompatActivity() {
     private fun setUpSelectionTracker() {
         vocabularyAdapter.selectionTracker = MySelectionTracker().apply {
             init(recyclerView)
-            addObserver { selection ->
-                run {
+            addObserver { selection -> whenSelectionChanges(selection) }
+        }
+    }
+
+    private fun whenSelectionChanges(selection: Selection<Long>) {
         if (!selection.isEmpty) {
-                        // TODO disable popup menu
+            vocabularyAdapter.showPopupMenu = false
             Log.d(TAG, "selection ${selection.toList()}")
             visible(tagLayout)
         } else {
+            vocabularyAdapter.showPopupMenu = true
             gone(tagLayout)
         }
     }
-            }
-        }
-    }
 
     override fun onPause() {
         super.onPause()

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

@@ -24,6 +24,7 @@ class VocabularyAdapter(private val vocabulary: VocabSet, private val mainActivi
     private lateinit var recyclerView: RecyclerView
     private lateinit var viewHolder: ViewHolder
     lateinit var selectionTracker: MySelectionTracker
+    var showPopupMenu = true
 
     init {
         setHasStableIds(true)
@@ -62,6 +63,7 @@ class VocabularyAdapter(private val vocabulary: VocabSet, private val mainActivi
     }
 
     private fun showPopupMenu(v: View, position: Int) {
+        if (showPopupMenu) {
             val popup = PopupMenu(mainActivity, v)
             popup.menuInflater.inflate(R.menu.word_item_menu, popup.menu)
             popup.setOnMenuItemClickListener {
@@ -77,6 +79,7 @@ class VocabularyAdapter(private val vocabulary: VocabSet, private val mainActivi
             if (mainActivity.supportFragmentManager.findFragmentByTag("edit_fragment") == null)
                 popup.show()
         }
+    }
 
     fun refresh() {}