From e7e3d94add2e30a3e2fa5e51c2a782c87c9f6497 Mon Sep 17 00:00:00 2001
From: FineFindus <63370021+FineFindus@users.noreply.github.com>
Date: Sun, 29 Jan 2023 21:31:15 +0100
Subject: [PATCH] feat(composeButton): hide when scrolling in profile

---
 .../android/fragments/ProfileFragment.java    | 32 ++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/mastodon/src/main/java/org/joinmastodon/android/fragments/ProfileFragment.java b/mastodon/src/main/java/org/joinmastodon/android/fragments/ProfileFragment.java
index a1f36ac80..a76d0a4da 100644
--- a/mastodon/src/main/java/org/joinmastodon/android/fragments/ProfileFragment.java
+++ b/mastodon/src/main/java/org/joinmastodon/android/fragments/ProfileFragment.java
@@ -142,7 +142,7 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 	private WindowInsets childInsets;
 	private PhotoViewer currentPhotoViewer;
 	private boolean editModeLoading;
-	private boolean isScrollingUp = false;
+	protected int scrollDiff = 0;
 
 	public ProfileFragment(){
 		super(R.layout.loader_fragment_overlay_toolbar);
@@ -730,6 +730,36 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 		if(currentPhotoViewer!=null){
 			currentPhotoViewer.offsetView(0, oldScrollY-scrollY);
 		}
+
+		int dy = scrollY - oldScrollY;
+
+		if (dy > 0 && fab.getVisibility() == View.VISIBLE) {
+			TranslateAnimation animate = new TranslateAnimation(
+					0,
+					0,
+					0,
+					fab.getHeight() * 2);
+			animate.setDuration(300);
+			animate.setFillAfter(true);
+			fab.startAnimation(animate);
+			fab.setVisibility(View.INVISIBLE);
+			scrollDiff = 0;
+		} else if (dy < 0 && fab.getVisibility() != View.VISIBLE) {
+			if (scrollDiff > 400) {
+				fab.setVisibility(View.VISIBLE);
+				TranslateAnimation animate = new TranslateAnimation(
+						0,
+						0,
+						fab.getHeight() * 2,
+						0);
+				animate.setDuration(300);
+				animate.setFillAfter(true);
+				fab.startAnimation(animate);
+				scrollDiff = 0;
+			} else {
+				scrollDiff += Math.abs(dy);
+			}
+		}
 	}
 
 	private Fragment getFragmentForPage(int page){