From 9fed3bc0a35284c04484672c58fdd8fc2bd0906a Mon Sep 17 00:00:00 2001
From: M66B <M66B@users.noreply.github.com>
Date: Thu, 9 May 2019 16:42:23 +0200
Subject: [PATCH] Fade in on up navigation

---
 app/src/main/java/eu/faircode/email/FragmentMessages.java | 7 +++++++
 app/src/main/res/anim/fade_in_fast.xml                    | 6 ++++++
 2 files changed, 13 insertions(+)
 create mode 100644 app/src/main/res/anim/fade_in_fast.xml

diff --git a/app/src/main/java/eu/faircode/email/FragmentMessages.java b/app/src/main/java/eu/faircode/email/FragmentMessages.java
index b38910648f..489528456a 100644
--- a/app/src/main/java/eu/faircode/email/FragmentMessages.java
+++ b/app/src/main/java/eu/faircode/email/FragmentMessages.java
@@ -471,6 +471,13 @@ public class FragmentMessages extends FragmentBase {
                     do {
                         Long key = adapter.getKeyAtPosition(pos);
                         if (key != null && isExpanded(key)) {
+                            int first = llm.findFirstVisibleItemPosition();
+                            View child = rvMessage.getChildAt(pos - (first < 0 ? 0 : first));
+                            if (child != null) {
+                                Animation animation = AnimationUtils.loadAnimation(getContext(), R.anim.fade_in_fast);
+                                child.startAnimation(animation);
+                            }
+
                             rvMessage.scrollToPosition(pos);
                             break;
                         }
diff --git a/app/src/main/res/anim/fade_in_fast.xml b/app/src/main/res/anim/fade_in_fast.xml
new file mode 100644
index 0000000000..bbb2089fe7
--- /dev/null
+++ b/app/src/main/res/anim/fade_in_fast.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<alpha xmlns:android="http://schemas.android.com/apk/res/android"
+    android:duration="@android:integer/config_shortAnimTime"
+    android:fromAlpha="0.0"
+    android:interpolator="@android:anim/decelerate_interpolator"
+    android:toAlpha="1.0" />