Make toolbar scroll away in home timeline (AND-208)

mastodon/src/main/java/org/joinmastodon/android/fragments/HomeTimelineFragment.java

@@ -61,6 +61,7 @@ import org.joinmastodon.android.ui.utils.DiscoverInfoBannerHelper;
 import org.joinmastodon.android.ui.viewcontrollers.HomeTimelineMenuController;
 import org.joinmastodon.android.ui.viewcontrollers.ToolbarDropdownMenuController;
 import org.joinmastodon.android.ui.views.FixedAspectRatioImageView;
+import org.joinmastodon.android.ui.views.NestedRecyclerScrollView;
 import org.joinmastodon.android.ui.views.NewPostsButtonContainer;
 import org.joinmastodon.android.updater.GithubSelfUpdater;
 import org.parceler.Parcels;
@@ -109,6 +110,7 @@ public class HomeTimelineFragment extends StatusListFragment implements ToolbarD
 	private BottomSheet donationSheet;
 
 	public HomeTimelineFragment(){
+		setLayout(R.layout.fragment_loader_hiding_toolbar);
 		setListLayoutId(R.layout.fragment_timeline);
 	}
 
@@ -279,6 +281,21 @@ public class HomeTimelineFragment extends StatusListFragment implements ToolbarD
 				}
 			}
 		});
+		View bottomOverlays=view.findViewById(R.id.bottom_overlays);
+		NestedRecyclerScrollView scroller=view.findViewById(R.id.scroller);
+		scroller.setScrollableChildSupplier(()->list);
+		scroller.setTakePriorityOverChildViews(true);
+		scroller.setOnScrollChangeListener((v, scrollX, scrollY, oldScrollX, oldScrollY)->{
+			bottomOverlays.setTranslationY(scrollY-getToolbar().getHeight());
+		});
+		scroller.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener(){
+			@Override
+			public boolean onPreDraw(){
+				scroller.getViewTreeObserver().removeOnPreDrawListener(this);
+				bottomOverlays.setTranslationY(scroller.getScrollY()-getToolbar().getHeight());
+				return true;
+			}
+		});
 
 		if(GithubSelfUpdater.needSelfUpdating()){
 			updateUpdateState(GithubSelfUpdater.getInstance().getState());

mastodon/src/main/res/layout/fragment_loader_hiding_toolbar.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<me.grishka.appkit.views.FragmentRootLinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	android:id="@+id/appkit_loader_root"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:background="?android:windowBackground"
+	android:orientation="vertical">
+
+	<org.joinmastodon.android.ui.views.NestedRecyclerScrollView
+		android:id="@+id/scroller"
+		android:layout_width="match_parent"
+		android:layout_height="match_parent"
+		android:fillViewport="true">
+
+		<org.joinmastodon.android.ui.views.TopBarsScrollAwayLinearLayout
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:orientation="vertical">
+
+			<include layout="@layout/appkit_toolbar" />
+
+			<FrameLayout
+				android:id="@+id/appkit_loader_content"
+				android:layout_width="match_parent"
+				android:layout_height="match_parent">
+
+				<include
+					android:id="@+id/loading"
+					layout="@layout/loading" />
+
+				<ViewStub
+					android:id="@+id/error"
+					android:layout_width="match_parent"
+					android:layout_height="match_parent"
+					android:layout="?errorViewLayout"
+					android:visibility="gone" />
+
+				<View
+					android:id="@+id/content_stub"
+					android:layout_width="match_parent"
+					android:layout_height="match_parent" />
+
+			</FrameLayout>
+		</org.joinmastodon.android.ui.views.TopBarsScrollAwayLinearLayout>
+	</org.joinmastodon.android.ui.views.NestedRecyclerScrollView>
+</me.grishka.appkit.views.FragmentRootLinearLayout>

mastodon/src/main/res/layout/fragment_timeline.xml

@@ -20,19 +20,31 @@
 			android:layout_height="match_parent"
 			android:id="@+id/empty"/>
 
-		<ImageButton
+		<FrameLayout
-			android:id="@+id/fab"
+			android:id="@+id/bottom_overlays"
-			android:layout_width="56dp"
+			android:layout_width="match_parent"
-			android:layout_height="56dp"
+			android:layout_height="match_parent">
-			android:layout_gravity="end|bottom"
+			<ImageButton
-			android:layout_marginEnd="16dp"
+				android:id="@+id/fab"
-			android:layout_marginBottom="16dp"
+				android:layout_width="56dp"
-			android:background="@drawable/bg_fab"
+				android:layout_height="56dp"
-			android:tint="?colorM3Primary"
+				android:layout_gravity="end|bottom"
-			android:scaleType="center"
+				android:layout_marginEnd="16dp"
-			android:stateListAnimator="@animator/fab_shadow"
+				android:layout_marginBottom="16dp"
-			android:contentDescription="@string/new_post"
+				android:background="@drawable/bg_fab"
-			android:src="@drawable/ic_edit_24px"/>
+				android:tint="?colorM3Primary"
+				android:scaleType="center"
+				android:stateListAnimator="@animator/fab_shadow"
+				android:contentDescription="@string/new_post"
+				android:src="@drawable/ic_edit_24px"/>
+
+			<ViewStub
+				android:id="@+id/donation_banner"
+				android:layout_width="match_parent"
+				android:layout_height="wrap_content"
+				android:layout_gravity="bottom"
+				android:layout="@layout/donation_banner"/>
+		</FrameLayout>
 
 		<org.joinmastodon.android.ui.views.NewPostsButtonContainer
 			android:id="@+id/new_posts_btn_wrap"
@@ -58,12 +70,5 @@
 				android:text="@string/see_new_posts"/>
 		</org.joinmastodon.android.ui.views.NewPostsButtonContainer>
 
-		<ViewStub
-			android:id="@+id/donation_banner"
-			android:layout_width="match_parent"
-			android:layout_height="wrap_content"
-			android:layout_gravity="bottom"
-			android:layout="@layout/donation_banner"/>
-
 	</FrameLayout>
 </me.grishka.appkit.views.RecursiveSwipeRefreshLayout>