From 33caad469000f45d5ec9e8d8cf26351849222e20 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Matuszewski?= <pamat@protonmail.com>
Date: Sat, 14 Dec 2019 16:05:36 +0100
Subject: [PATCH] make main page tabs scrollable

---
 .../newpipe/fragments/MainFragment.java       |  3 +-
 .../newpipe/views/ScrollableTabLayout.java    | 83 +++++++++++++++++++
 app/src/main/res/layout/fragment_main.xml     |  3 +-
 3 files changed, 87 insertions(+), 2 deletions(-)
 create mode 100644 app/src/main/java/org/schabi/newpipe/views/ScrollableTabLayout.java

diff --git a/app/src/main/java/org/schabi/newpipe/fragments/MainFragment.java b/app/src/main/java/org/schabi/newpipe/fragments/MainFragment.java
index 720e0f216..88a4c9c63 100644
--- a/app/src/main/java/org/schabi/newpipe/fragments/MainFragment.java
+++ b/app/src/main/java/org/schabi/newpipe/fragments/MainFragment.java
@@ -30,6 +30,7 @@ import org.schabi.newpipe.settings.tabs.Tab;
 import org.schabi.newpipe.settings.tabs.TabsManager;
 import org.schabi.newpipe.util.NavigationHelper;
 import org.schabi.newpipe.util.ServiceHelper;
+import org.schabi.newpipe.views.ScrollableTabLayout;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -37,7 +38,7 @@ import java.util.List;
 public class MainFragment extends BaseFragment implements TabLayout.OnTabSelectedListener {
     private ViewPager viewPager;
     private SelectedTabsPagerAdapter pagerAdapter;
-    private TabLayout tabLayout;
+    private ScrollableTabLayout tabLayout;
 
     private List<Tab> tabsList = new ArrayList<>();
     private TabsManager tabsManager;
diff --git a/app/src/main/java/org/schabi/newpipe/views/ScrollableTabLayout.java b/app/src/main/java/org/schabi/newpipe/views/ScrollableTabLayout.java
new file mode 100644
index 000000000..88b108052
--- /dev/null
+++ b/app/src/main/java/org/schabi/newpipe/views/ScrollableTabLayout.java
@@ -0,0 +1,83 @@
+package org.schabi.newpipe.views;
+
+import android.content.Context;
+import android.os.Build;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.View;
+import android.view.ViewTreeObserver.OnGlobalLayoutListener;
+
+import androidx.annotation.NonNull;
+
+import com.google.android.material.tabs.TabLayout;
+import com.google.android.material.tabs.TabLayout.Tab;
+
+/**
+ * A TabLayout that is scrollable when tabs exceed its width.
+ */
+public class ScrollableTabLayout extends TabLayout {
+    private static final String TAG = ScrollableTabLayout.class.getSimpleName();
+
+    public ScrollableTabLayout(Context context) {
+        super(context);
+    }
+
+    public ScrollableTabLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public ScrollableTabLayout(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    @Override
+    protected void onAttachedToWindow() {
+        super.onAttachedToWindow();
+
+        setTabMode(TabLayout.MODE_FIXED);
+        resetMode();
+    }
+
+    @Override
+    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        super.onSizeChanged(w, h, oldw, oldh);
+
+        resetMode();
+    }
+
+    @Override
+    public void addTab(@NonNull Tab tab, int position, boolean setSelected) {
+        super.addTab(tab, position, setSelected);
+
+        resetMode();
+    }
+
+    @Override
+    public void removeTabAt(int position) {
+        super.removeTabAt(position);
+
+        resetMode();
+    }
+
+    private void resetMode() {
+        if (getTabCount() == 0 || getTabAt(0).view == null) return;
+        setTabMode(TabLayout.MODE_FIXED);
+
+        int layoutWidth = getWidth();
+        int minimumWidth = ((View) getTabAt(0).view).getMinimumWidth();
+        if (minimumWidth * getTabCount() > layoutWidth) {
+            setTabMode(TabLayout.MODE_SCROLLABLE);
+            return;
+        }
+
+        int actualWidth = 0;
+        for (int i = 0; i < getTabCount(); ++i) {
+            if (getTabAt(i).view == null) return;
+            actualWidth += ((View) getTabAt(i).view).getWidth();
+            if (actualWidth > layoutWidth) {
+                setTabMode(TabLayout.MODE_SCROLLABLE);
+                return;
+            }
+        }
+    }
+}
diff --git a/app/src/main/res/layout/fragment_main.xml b/app/src/main/res/layout/fragment_main.xml
index 85614342d..1a2455691 100644
--- a/app/src/main/res/layout/fragment_main.xml
+++ b/app/src/main/res/layout/fragment_main.xml
@@ -6,12 +6,13 @@
     android:layout_height="match_parent">
 
 
-    <com.google.android.material.tabs.TabLayout
+    <org.schabi.newpipe.views.ScrollableTabLayout
         android:id="@+id/main_tab_layout"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alignParentTop="true"
         android:background="?attr/colorPrimary"
+        app:tabMinWidth="60dp"
         app:tabGravity="fill"/>
 
     <androidx.viewpager.widget.ViewPager