Cleaned up selection implementation

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

@@ -9,12 +9,8 @@ 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.*
@@ -54,8 +50,6 @@ class MainActivity : AppCompatActivity() {
             vocabularyAdapter.sort = Sort.BY_WORD
         if (item.itemId == R.id.sortByTranslation)
             vocabularyAdapter.sort = Sort.BY_TRANSLATION
-        if (item.itemId == R.id.addTag)
-            vocabularyAdapter.addTag()
 
         return super.onOptionsItemSelected(item)
     }
@@ -90,24 +84,14 @@ 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()
+                    } else showToastNoWords()
                 }
             }
         },
@@ -137,7 +121,8 @@ class MainActivity : AppCompatActivity() {
         hideKeyboard()
         try {
             FirestoreManager().saveWords(vocabularyAdapter.getModifiedWords())
-        } catch (ignored: Exception) {}
+        } catch (ignored: Exception) {
+        }
     }
 
     companion object {

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

@@ -4,14 +4,11 @@ import android.view.MotionEvent
 import androidx.recyclerview.selection.ItemDetailsLookup
 import androidx.recyclerview.widget.RecyclerView
 
-class MyItemDetailsLookup(private val recyclerView: RecyclerView) :
-        ItemDetailsLookup<Long>() {
+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()
-        }
+        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/recycler_view/MyTracker.kt

+package com.paktalin.vocabularynotebook.ui.recycler_view
+
+import androidx.recyclerview.selection.*
+import androidx.recyclerview.widget.RecyclerView
+
+fun initializeTracker(recyclerView: RecyclerView, onSelection: (Selection<Long>) -> Unit): SelectionTracker<Long>? {
+    val tracker = SelectionTracker.Builder<Long>(
+            "mySelection",
+            recyclerView,
+            StableIdKeyProvider(recyclerView),
+            MyItemDetailsLookup(recyclerView),
+            StorageStrategy.createLongStorage()
+    ).withSelectionPredicate(
+            SelectionPredicates.createSelectAnything()
+    ).build()
+
+    tracker.addObserver(object : SelectionTracker.SelectionObserver<Long>() {
+        override fun onSelectionChanged() {
+            super.onSelectionChanged()
+            onSelection(tracker?.selection!!)
+        }
+    })
+    return tracker
+
+
+}
+
+private val TAG = "VN/MyTracker"
\ No newline at end of file

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

 package com.paktalin.vocabularynotebook.ui.recycler_view
 
-import android.graphics.Color
 import android.view.View
-import android.widget.LinearLayout
 import android.widget.TextView
 import androidx.recyclerview.selection.ItemDetailsLookup
 import androidx.recyclerview.widget.RecyclerView
 import com.paktalin.vocabularynotebook.firestoreitems.WordPojo
-import com.paktalin.vocabularynotebook.utils.Log
 import kotlinx.android.synthetic.main.word_item.view.*
 
-class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView), View.OnClickListener {
-    override fun onClick(p0: View?) {
-        Log.d(TAG, "click")
-        p0?.setBackgroundColor(Color.GREEN)
-    }
+class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
 
     private val tvWord: TextView = itemView.word
     private val tvTranslation: TextView = itemView.translation
-    val layout: LinearLayout = itemView.layout
 
     fun bind(wordPojo: WordPojo, position: Int, isActivated: Boolean, showPopupMenu: (View, Int) -> Unit) {
         tvWord.text = wordPojo.word
         tvTranslation.text = wordPojo.translation
-//        itemView.setOnClickListener { showPopupMenu(itemView, position) }
+        itemView.setOnClickListener { showPopupMenu(itemView, position) }
         itemView.isActivated = isActivated
     }
 

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

@@ -7,6 +7,7 @@ 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
@@ -15,16 +16,19 @@ 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.shortToast
+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
-    var tracker: SelectionTracker<Long>? = null
+    private var tracker: SelectionTracker<Long>? = null
+    private var menu = true
 
     init {
         setHasStableIds(true)
@@ -41,6 +45,7 @@ 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))
     }
 
@@ -62,18 +67,25 @@ class VocabularyAdapter(private val vocabulary: VocabSet, private val mainActivi
         //todo set click listener to menu
     }
 
-
     private fun showPopupMenu(v: View, position: Int) {
+        if (menu) {
             val popup = PopupMenu(mainActivity, v)
             popup.menuInflater.inflate(R.menu.word_item_menu, popup.menu)
             popup.setOnMenuItemClickListener {
-            if (it.itemId == R.id.option_delete) { deleteWord(vocabulary.displayedAt(position), position) }
-            if (it.itemId == R.id.option_edit) { startEditFragment(v, vocabulary.displayedAt(position)) }
+                if (it.itemId == R.id.option_delete) {
+                    deleteWord(vocabulary.displayedAt(position), position)
+                }
+                if (it.itemId == R.id.option_edit) {
+                    startEditFragment(v, vocabulary.displayedAt(position))
+                }
                 true
             }
             // if not edit mode, then start EditFragment
             if (mainActivity.supportFragmentManager.findFragmentByTag("edit_fragment") == null)
                 popup.show()
+        } else {
+            Log.d(TAG, "not menu!")
+        }
     }
 
     fun refresh() {
@@ -133,11 +145,15 @@ class VocabularyAdapter(private val vocabulary: VocabSet, private val mainActivi
         return vocabulary.getModified()
     }
 
-    fun addTag() {
-        shortToast(mainActivity, mainActivity.getString(R.string.toast_select_words_to_tag))
-        // TODO make words selectable
-        // TODO add complete button
-        // TODO collect selected words in a list
+    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 {

app/src/main/res/menu/options_menu.xml

@@ -23,9 +23,4 @@
         android:id="@+id/sortByTranslation"
         android:title="@string/sort_by_translation"
         app:showAsAction="never" />
-
-    <item
-        android:id="@+id/addTag"
-        android:title="@string/add_tag"
-        app:showAsAction="never" />
 </menu>
\ No newline at end of file