rewrite threads with Kotlin & coroutines (#2617)

* initial class setup

* handle events and filters

* handle status state changes

* code formatting

* fix status filtering

* cleanup code a bit

* implement removeAllByAccountId

* move toolbar into fragment, implement menu

* error and load state handling

* fix pull to refresh

* implement reveal button

* use requireContext() instead of context!!

* jump to detailed status

* add ViewThreadViewModelTest

* fix ktlint

* small code improvements (thx charlag)

* add testcase for toggleRevealButton

* add more state change testcases to ViewThreadViewModel

app/src/main/res/drawable/ic_back.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24.0"
+    android:viewportHeight="24.0"
+    android:autoMirrored="true"
+    android:tint="?attr/colorControlNormal">
+    <path
+        android:pathData="M20,11L7.8,11l5.6,-5.6L12,4l-8,8l8,8l1.4,-1.4L7.8,13L20,13L20,11z"
+        android:fillColor="@android:color/white"/>
+</vector>

app/src/main/res/layout-sw640dp/fragment_view_thread.xml

@@ -1,15 +1,30 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
+<androidx.coordinatorlayout.widget.CoordinatorLayout 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="match_parent"
-    android:background="?attr/windowBackgroundColor"
-    tools:viewBindingIgnore="true">
+    android:layout_height="match_parent">
+
+    <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appbar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:elevation="@dimen/actionbar_elevation" >
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            app:title="@string/title_view_thread"
+            app:navigationIcon="@drawable/ic_back"
+            app:menu="@menu/view_thread_toolbar"/>
+
+    </com.google.android.material.appbar.AppBarLayout>
 
     <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
         android:id="@+id/swipeRefreshLayout"
         android:layout_width="640dp"
         android:layout_height="match_parent"
+        app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
         android:layout_gravity="center_horizontal">
 
         <androidx.recyclerview.widget.RecyclerView
@@ -18,6 +33,20 @@
             android:layout_height="match_parent"
             android:background="?android:attr/colorBackground"
             android:scrollbars="vertical" />
+
     </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
 
-</FrameLayout>
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"/>
+
+    <com.keylesspalace.tusky.view.BackgroundMessageView
+        android:id="@+id/statusView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:visibility="gone"
+        android:layout_gravity="center" />
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/layout/activity_view_thread.xml

@@ -2,12 +2,9 @@
 <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:id="@+id/activity_view_thread"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context="com.keylesspalace.tusky.ViewThreadActivity">
-
-    <include layout="@layout/toolbar_basic" />
+    tools:context="com.keylesspalace.tusky.components.viewthread.ViewThreadActivity">
 
     <androidx.fragment.app.FragmentContainerView
         android:id="@+id/fragment_container"

app/src/main/res/layout/fragment_view_thread.xml

@@ -1,17 +1,52 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.swiperefreshlayout.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/swipeRefreshLayout"
+<androidx.coordinatorlayout.widget.CoordinatorLayout 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="match_parent"
-    android:layout_gravity="top"
-    tools:viewBindingIgnore="true">
+    android:layout_height="match_parent">
 
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/recyclerView"
+    <com.google.android.material.appbar.AppBarLayout
+        android:id="@+id/appbar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:elevation="@dimen/actionbar_elevation" >
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            app:title="@string/title_view_thread"
+            app:navigationIcon="@drawable/ic_back"
+            app:menu="@menu/view_thread_toolbar"/>
+
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+        android:id="@+id/swipeRefreshLayout"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:background="?android:attr/colorBackground"
-        android:scrollbars="vertical" />
+        app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
+        android:layout_gravity="top">
 
-</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/recyclerView"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:background="?android:attr/colorBackground"
+            android:scrollbars="vertical" />
+
+    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
+
+    <ProgressBar
+        android:id="@+id/progressBar"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"/>
+
+    <com.keylesspalace.tusky.view.BackgroundMessageView
+        android:id="@+id/statusView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:visibility="gone"
+        android:layout_gravity="center" />
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>