show compose button when switching tab

closes sk22#506

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

@@ -68,7 +68,7 @@ import me.grishka.appkit.utils.BindableViewHolder;
 import me.grishka.appkit.utils.V;
 import me.grishka.appkit.views.UsableRecyclerView;
 
-public abstract class BaseStatusListFragment<T extends DisplayItemsParent> extends RecyclerFragment<T> implements PhotoViewerHost, ScrollableToTop{
+public abstract class BaseStatusListFragment<T extends DisplayItemsParent> extends RecyclerFragment<T> implements PhotoViewerHost, ScrollableToTop, HasFab{
 	protected ArrayList<StatusDisplayItem> displayItems=new ArrayList<>();
 	protected DisplayItemsAdapter adapter;
 	protected String accountID;
@@ -268,15 +268,16 @@ public abstract class BaseStatusListFragment<T extends DisplayItemsParent> exten
 		});
 	}
 
+	@Override
 	public @Nullable View getFab() {
 		if (getParentFragment() instanceof HasFab l) return l.getFab();
 		else return fab;
 	}
 
-	public void animateFab(boolean show) {
+	@Override
+	public void showFab() {
 		View fab = getFab();
-		if (fab == null) return;
+		if (fab == null || fab.getVisibility() == View.VISIBLE) return;
-		if (show && fab.getVisibility() != View.VISIBLE) {
 		fab.setVisibility(View.VISIBLE);
 		TranslateAnimation animate = new TranslateAnimation(
 				0,
@@ -285,7 +286,12 @@ public abstract class BaseStatusListFragment<T extends DisplayItemsParent> exten
 				0);
 		animate.setDuration(300);
 		fab.startAnimation(animate);
-		} else if (!show && fab.getVisibility() == View.VISIBLE) {
+	}
+
+	@Override
+	public void hideFab() {
+		View fab = getFab();
+		if (fab == null || fab.getVisibility() != View.VISIBLE) return;
 		TranslateAnimation animate = new TranslateAnimation(
 				0,
 				0,
@@ -296,7 +302,6 @@ public abstract class BaseStatusListFragment<T extends DisplayItemsParent> exten
 		fab.setVisibility(View.INVISIBLE);
 		scrollDiff = 0;
 	}
-	}
 
 	@Override
 	public void onViewCreated(View view, Bundle savedInstanceState){
@@ -312,10 +317,10 @@ public abstract class BaseStatusListFragment<T extends DisplayItemsParent> exten
 				View fab = getFab();
 				if (fab!=null && GlobalUserPreferences.autoHideFab) {
 					if (dy > 0 && fab.getVisibility() == View.VISIBLE) {
-						animateFab(false);
+						hideFab();
 					} else if (dy < 0 && fab.getVisibility() != View.VISIBLE) {
 						if (list.getChildAt(0).getTop() == 0 || scrollDiff > 400) {
-							animateFab(true);
+							showFab();
 							scrollDiff = 0;
 						} else {
 							scrollDiff += Math.abs(dy);

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

@@ -4,4 +4,6 @@ import android.view.View;
 
 public interface HasFab {
     View getFab();
+    void showFab();
+    void hideFab();
 }

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

@@ -228,6 +228,7 @@ public class HomeFragment extends AppKitFragment implements OnBackPressedListene
 		}
 		getChildFragmentManager().beginTransaction().hide(fragmentForTab(currentTab)).show(newFragment).commit();
 		maybeTriggerLoading(newFragment);
+		if (newFragment instanceof HasFab fabulous) fabulous.showFab();
 		currentTab=tab;
 		((FragmentStackActivity)getActivity()).invalidateSystemBarColors(this);
 	}

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

@@ -448,10 +448,20 @@ public class HomeTabFragment extends MastodonToolbarFragment implements Scrollab
 		updateSwitcherIcon(i);
 	}
 
+	@Override
+	public void showFab() {
+		if (fragments[pager.getCurrentItem()] instanceof BaseStatusListFragment<?> l) l.showFab();
+	}
+
+	@Override
+	public void hideFab() {
+		if (fragments[pager.getCurrentItem()] instanceof BaseStatusListFragment<?> l) l.hideFab();
+	}
+
 	private void updateSwitcherIcon(int i) {
 		timelineIcon.setImageResource(timelines[i].getIcon().iconRes);
 		timelineTitle.setText(timelines[i].getTitle(getContext()));
-		if (fragments[i] instanceof BaseStatusListFragment<?> l) l.animateFab(true);
+		showFab();
 	}
 
 	@Override

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

@@ -758,6 +758,16 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 		return fab;
 	}
 
+	@Override
+	public void showFab() {
+		if (getFragmentForPage(pager.getCurrentItem()) instanceof HasFab fabulous) fabulous.showFab();
+	}
+
+	@Override
+	public void hideFab() {
+		if (getFragmentForPage(pager.getCurrentItem()) instanceof HasFab fabulous) fabulous.hideFab();
+	}
+
 	private void onScrollChanged(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY){
 		int topBarsH=getToolbar().getHeight()+statusBarHeight;
 		if(scrollY>avatarBorder.getTop()-topBarsH){