use MaterialContainerTransform for ActionButton animation (#1961)

* use MaterialContainerTransform for ActionButton animation

* fix back button in TabPreferenceActivity

app/build.gradle

@@ -146,7 +146,7 @@ dependencies {
     implementation "androidx.room:room-rxjava2:$roomVersion"
     kapt "androidx.room:room-compiler:$roomVersion"
 
-    implementation "com.google.android.material:material:1.2.0"
+    implementation "com.google.android.material:material:1.2.1"
     implementation 'com.google.android:flexbox:2.0.1'
 
     implementation "com.squareup.retrofit2:retrofit:$retrofitVersion"

app/src/main/java/com/keylesspalace/tusky/TabPreferenceActivity.kt

@@ -15,19 +15,25 @@
 
 package com.keylesspalace.tusky
 
+import android.graphics.Color
 import android.os.Bundle
 import android.util.Log
 import android.view.MenuItem
+import android.view.View
 import android.widget.FrameLayout
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.widget.AppCompatEditText
+import androidx.core.view.isVisible
 import androidx.core.view.updatePadding
 import androidx.lifecycle.Lifecycle
 import androidx.recyclerview.widget.DividerItemDecoration
 import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
+import androidx.transition.TransitionManager
 import at.connyduck.sparkbutton.helpers.Utils
+import com.google.android.material.transition.MaterialArcMotion
+import com.google.android.material.transition.MaterialContainerTransform
 import com.keylesspalace.tusky.adapter.ItemInteractionListener
 import com.keylesspalace.tusky.adapter.ListSelectionAdapter
 import com.keylesspalace.tusky.adapter.TabAdapter
@@ -129,19 +135,17 @@ class TabPreferenceActivity : BaseActivity(), Injectable, ItemInteractionListene
 
         touchHelper.attachToRecyclerView(currentTabsRecyclerView)
 
-
         actionButton.setOnClickListener {
-            actionButton.isExpanded = true
+            toggleFab(true)
         }
 
         scrim.setOnClickListener {
-            actionButton.isExpanded = false
+            toggleFab(false)
         }
 
         maxTabsInfo.text = getString(R.string.max_tab_number_reached, MAX_TAB_COUNT)
 
         updateAvailableTabs()
-
     }
 
     override fun onTabAdded(tab: TabData) {
@@ -150,7 +154,7 @@ class TabPreferenceActivity : BaseActivity(), Injectable, ItemInteractionListene
             return
         }
 
-        actionButton.isExpanded = false
+        toggleFab(false)
 
         if (tab.id == HASHTAG) {
             showAddHashtagDialog()
@@ -188,6 +192,22 @@ class TabPreferenceActivity : BaseActivity(), Injectable, ItemInteractionListene
         currentTabsAdapter.notifyItemChanged(tabPosition)
     }
 
+    private fun toggleFab(expand: Boolean) {
+        val transition = MaterialContainerTransform().apply {
+            startView = if (expand) actionButton else sheet
+            val endView: View = if (expand) sheet else actionButton
+            this.endView = endView
+            addTarget(endView)
+            scrimColor = Color.TRANSPARENT
+            setPathMotion(MaterialArcMotion())
+        }
+
+        TransitionManager.beginDelayedTransition(tabPreferenceContainer, transition)
+        actionButton.visible(!expand)
+        sheet.visible(expand)
+        scrim.visible(expand)
+    }
+
     private fun showAddHashtagDialog(tab: TabData? = null, tabPosition: Int = 0) {
 
         val frameLayout = FrameLayout(this)
@@ -322,10 +342,10 @@ class TabPreferenceActivity : BaseActivity(), Injectable, ItemInteractionListene
     }
 
     override fun onBackPressed() {
-        if (actionButton.isExpanded) {
+        if (actionButton.isVisible) {
-            actionButton.isExpanded = false
-        } else {
             super.onBackPressed()
+        } else {
+            toggleFab(false)
         }
     }
 

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

@@ -2,6 +2,7 @@
 <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/tabPreferenceContainer"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
@@ -19,8 +20,7 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:background="?attr/scrimBackground"
-        android:visibility="invisible"
+        android:visibility="invisible" />
-        app:layout_behavior="@string/fab_transformation_scrim_behavior" />
 
     <com.google.android.material.floatingactionbutton.FloatingActionButton
         android:id="@+id/actionButton"
@@ -30,7 +30,7 @@
         android:layout_margin="16dp"
         android:src="@drawable/ic_plus_24dp" />
 
-    <com.google.android.material.transformation.TransformationChildCard
+    <com.google.android.material.card.MaterialCardView
         android:id="@+id/sheet"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -38,8 +38,7 @@
         android:layout_margin="16dp"
         android:visibility="invisible"
         app:cardBackgroundColor="?attr/colorSurface"
-        app:cardElevation="2dp"
+        app:cardElevation="2dp">
-        app:layout_behavior="@string/fab_transformation_sheet_behavior">
 
         <LinearLayout
             android:layout_width="240dp"
@@ -76,6 +75,7 @@
                 android:textColor="?attr/colorOnPrimary"
                 android:textSize="?attr/status_text_large" />
         </LinearLayout>
-    </com.google.android.material.transformation.TransformationChildCard>
+
+    </com.google.android.material.card.MaterialCardView>
 
 </androidx.coordinatorlayout.widget.CoordinatorLayout>