2 files changed, 79 insertions, 0 deletions
diff --git a/ui/common/src/main/java/de/danoeh/antennapod/ui/common/PagedToolbarFragment.java b/ui/common/src/main/java/de/danoeh/antennapod/ui/common/PagedToolbarFragment.java
new file mode 100644
index 000000000..118d2ffb2
--- /dev/null
+++ b/ui/common/src/main/java/de/danoeh/antennapod/ui/common/PagedToolbarFragment.java
@@ -0,0 +1,48 @@
+package de.danoeh.antennapod.ui.common;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.widget.Toolbar;
+import androidx.fragment.app.Fragment;
+import androidx.viewpager2.widget.ViewPager2;
+
+/**
+ * Fragment with a ViewPager where the displayed items influence the top toolbar's menu.
+ * All items share the same general menu items and are just allowed to show/hide them.
+ */
+public abstract class PagedToolbarFragment extends Fragment {
+    private Toolbar toolbar;
+    private ViewPager2 viewPager;
+
+    /**
+     * Invalidate the toolbar menu if the current child fragment is visible.
+     * @param child The fragment to invalidate
+     */
+    public void invalidateOptionsMenuIfActive(@NonNull Fragment child) {
+        Fragment visibleChild = getChildFragmentManager().findFragmentByTag("f" + viewPager.getCurrentItem());
+        if (visibleChild == child) {
+            visibleChild.onPrepareOptionsMenu(toolbar.getMenu());
+        }
+    }
+
+    protected void setupPagedToolbar(Toolbar toolbar, ViewPager2 viewPager) {
+        this.toolbar = toolbar;
+        this.viewPager = viewPager;
+
+        toolbar.setOnMenuItemClickListener(item -> {
+            Fragment child = getChildFragmentManager().findFragmentByTag("f" + viewPager.getCurrentItem());
+            if (child != null) {
+                return child.onOptionsItemSelected(item);
+            }
+            return false;
+        });
+        viewPager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
+            @Override
+            public void onPageSelected(int position) {
+                Fragment child = getChildFragmentManager().findFragmentByTag("f" + position);
+                if (child != null) {
+                    child.onPrepareOptionsMenu(toolbar.getMenu());
+                }
+            }
+        });
+    }
+}
diff --git a/ui/common/src/main/res/layout/pager_fragment.xml b/ui/common/src/main/res/layout/pager_fragment.xml
new file mode 100644
index 000000000..ea007892a
--- /dev/null
+++ b/ui/common/src/main/res/layout/pager_fragment.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+    <androidx.appcompat.widget.Toolbar
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:minHeight="?attr/actionBarSize"
+            android:theme="?attr/actionBarTheme"
+            app:navigationIcon="?homeAsUpIndicator"
+            android:id="@+id/toolbar"/>
+
+    <com.google.android.material.tabs.TabLayout
+            android:id="@+id/sliding_tabs"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:background="?android:attr/windowBackground"
+            app:tabBackground="?attr/selectableItemBackground"
+            app:tabMode="fixed"
+            app:tabGravity="fill"/>
+
+    <androidx.viewpager2.widget.ViewPager2
+            android:id="@+id/viewpager"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"/>
+
+</LinearLayout>