Added MsgsLoadStateAdapter. Refactored code.| #1806

FlowCrypt/src/main/java/com/flowcrypt/email/ui/activity/fragment/MessagesListFragment.kt

@@ -73,6 +73,7 @@ import com.flowcrypt.email.ui.activity.fragment.base.BaseFragment
 import com.flowcrypt.email.ui.activity.fragment.base.ListProgressBehaviour
 import com.flowcrypt.email.ui.activity.fragment.dialog.InfoDialogFragment
 import com.flowcrypt.email.ui.activity.fragment.dialog.TwoWayDialogFragment
+import com.flowcrypt.email.ui.adapter.MsgsLoadStateAdapter
 import com.flowcrypt.email.ui.adapter.MsgsPagedListAdapter
 import com.flowcrypt.email.ui.adapter.selection.CustomStableIdKeyProvider
 import com.flowcrypt.email.ui.adapter.selection.MsgItemDetailsLookup
@@ -572,7 +573,7 @@ class MessagesListFragment : BaseFragment<FragmentMessagesListBinding>(),
     binding?.recyclerViewMsgs?.addItemDecoration(
       DividerItemDecoration(context, layoutManager.orientation)
     )
-    binding?.recyclerViewMsgs?.adapter = adapter
+    binding?.recyclerViewMsgs?.adapter = adapter.withLoadStateFooter(MsgsLoadStateAdapter())
     setupItemTouchHelper()
     //setupSelectionTracker()
     setupBottomOverScroll()

FlowCrypt/src/main/java/com/flowcrypt/email/ui/adapter/MsgsLoadStateAdapter.kt

@@ -0,0 +1,43 @@
+/*
+ * © 2016-present FlowCrypt a.s. Limitations apply. Contact [email protected]
+ * Contributors: DenBond7
+ */
+
+package com.flowcrypt.email.ui.adapter
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.paging.LoadState
+import androidx.paging.LoadStateAdapter
+import androidx.recyclerview.widget.RecyclerView
+import com.flowcrypt.email.R
+import com.flowcrypt.email.databinding.LoadMsgsProgressBinding
+import com.flowcrypt.email.extensions.visibleOrGone
+
+/**
+ * @author Denis Bondarenko
+ *         Date: 5/18/22
+ *         Time: 6:23 PM
+ *         E-mail: [email protected]
+ */
+class MsgsLoadStateAdapter : LoadStateAdapter<MsgsLoadStateAdapter.ViewHolder>() {
+  override fun onBindViewHolder(holder: ViewHolder, loadState: LoadState) {
+    holder.bind(loadState)
+  }
+
+  override fun onCreateViewHolder(parent: ViewGroup, loadState: LoadState): ViewHolder {
+    return ViewHolder(
+      LayoutInflater.from(parent.context)
+        .inflate(R.layout.load_msgs_progress, parent, false)
+    )
+  }
+
+  inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+    val binding: LoadMsgsProgressBinding = LoadMsgsProgressBinding.bind(itemView)
+
+    fun bind(loadState: LoadState) {
+      binding.progressBar.visibleOrGone(loadState is LoadState.Loading)
+    }
+  }
+}

FlowCrypt/src/main/res/layout/load_msgs_progress.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ © 2016-present FlowCrypt a.s. Limitations apply. Contact [email protected]
+  ~ Contributors: DenBond7
+  -->
+
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <ProgressBar
+        android:id="@+id/progressBar"
+        style="?android:attr/progressBarStyle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="@dimen/default_margin_content_small"
+        android:layout_marginBottom="@dimen/default_margin_content_small"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>