From 7b4ece366e963fcb97c1054b577c1b28878b19b6 Mon Sep 17 00:00:00 2001
From: LoveSy <shana@zju.edu.cn>
Date: Tue, 23 Nov 2021 22:49:29 +0800
Subject: [PATCH] [app] Show fab when switching page (#1434)

---
 .../manager/ui/fragment/ModulesFragment.java     | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/app/src/main/java/org/lsposed/manager/ui/fragment/ModulesFragment.java b/app/src/main/java/org/lsposed/manager/ui/fragment/ModulesFragment.java
index dcdc7c67..5719ce5f 100644
--- a/app/src/main/java/org/lsposed/manager/ui/fragment/ModulesFragment.java
+++ b/app/src/main/java/org/lsposed/manager/ui/fragment/ModulesFragment.java
@@ -52,6 +52,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.widget.SearchView;
 import androidx.constraintlayout.widget.ConstraintLayout;
+import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import androidx.core.content.ContextCompat;
 import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.LinearLayoutManager;
@@ -61,7 +62,9 @@ import androidx.viewpager2.widget.ViewPager2;
 
 import com.bumptech.glide.request.target.CustomTarget;
 import com.bumptech.glide.request.transition.Transition;
+import com.google.android.material.behavior.HideBottomViewOnScrollBehavior;
 import com.google.android.material.checkbox.MaterialCheckBox;
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.google.android.material.snackbar.Snackbar;
 import com.google.android.material.tabs.TabLayout;
 import com.google.android.material.tabs.TabLayoutMediator;
@@ -139,6 +142,18 @@ public class ModulesFragment extends BaseFragment implements ModuleUtil.ModuleLi
         }
     }
 
+    private void showFab() {
+        var layoutParams = binding.fab.getLayoutParams();
+        if (layoutParams instanceof CoordinatorLayout.LayoutParams) {
+            var coordinatorLayoutBehavior =
+                    ((CoordinatorLayout.LayoutParams) layoutParams).getBehavior();
+            if (coordinatorLayoutBehavior instanceof HideBottomViewOnScrollBehavior) {
+                //noinspection unchecked
+                ((HideBottomViewOnScrollBehavior<FloatingActionButton>) coordinatorLayoutBehavior).slideUp(binding.fab);
+            }
+        }
+    }
+
     private void updateProgress() {
         if (binding != null) {
             var position = binding.viewPager.getCurrentItem();
@@ -162,6 +177,7 @@ public class ModulesFragment extends BaseFragment implements ModuleUtil.ModuleLi
             @Override
             public void onPageSelected(int position) {
                 updateProgress();
+                showFab();
             }
         });