implement logic

app/src/main/java/com/github/libretube/ui/extensions/WithMaxSize.kt

@@ -0,0 +1,5 @@
+package com.github.libretube.ui.extensions
+
+fun <T> List<T>.withMaxSize(maxSize: Int): List<T> {
+    return this.filterIndexed { index, _ -> index < maxSize }
+}

app/src/main/java/com/github/libretube/ui/fragments/HomeFragment.kt

@@ -7,8 +7,13 @@ import android.view.ViewGroup
 import androidx.fragment.app.activityViewModels
 import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.findNavController
+import androidx.recyclerview.widget.GridLayoutManager
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 import com.github.libretube.R
 import com.github.libretube.databinding.FragmentHomeBinding
+import com.github.libretube.ui.adapters.PlaylistsAdapter
+import com.github.libretube.ui.adapters.VideosAdapter
 import com.github.libretube.ui.base.BaseFragment
 import com.github.libretube.ui.models.HomeModel
 import com.github.libretube.util.LocaleHelper
@@ -47,7 +52,48 @@ class HomeFragment : BaseFragment() {
             viewModel.fetchHome(requireContext(), LocaleHelper.getTrendingRegion(requireContext()))
         }
 
+        viewModel.feed.observe(viewLifecycleOwner) {
+            binding.featuredTV.visibility = View.VISIBLE
+            binding.featuredRV.visibility = View.VISIBLE
+            binding.progress.visibility = View.GONE
+            binding.featuredRV.layoutManager = LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false)
+            binding.featuredRV.adapter = VideosAdapter(
+                it.toMutableList(),
+                childFragmentManager,
+                forceMode = VideosAdapter.Companion.ForceMode.RELATED
+            )
+        }
+
         viewModel.trending.observe(viewLifecycleOwner) {
+            if (it.isEmpty()) return@observe
+            binding.trendingTV.visibility = View.VISIBLE
+            binding.trendingRV.visibility = View.VISIBLE
+            binding.progress.visibility = View.GONE
+            binding.trendingRV.layoutManager = GridLayoutManager(context, 2)
+            binding.trendingRV.adapter = VideosAdapter(
+                it.toMutableList(),
+                childFragmentManager,
+                forceMode = VideosAdapter.Companion.ForceMode.TRENDING
+            )
+        }
+
+        viewModel.playlists.observe(viewLifecycleOwner) {
+            if (it.isEmpty()) return@observe
+            binding.playlistsRV.visibility = View.VISIBLE
+            binding.playlistsTV.visibility = View.VISIBLE
+            binding.progress.visibility = View.GONE
+            binding.playlistsRV.layoutManager = LinearLayoutManager(context)
+            binding.playlistsRV.adapter = PlaylistsAdapter(it.toMutableList(), childFragmentManager)
+            binding.playlistsRV.adapter?.registerAdapterDataObserver(object :
+                    RecyclerView.AdapterDataObserver() {
+                    override fun onItemRangeRemoved(positionStart: Int, itemCount: Int) {
+                        super.onItemRangeRemoved(positionStart, itemCount)
+                        if (itemCount == 0) {
+                            binding.playlistsRV.visibility = View.GONE
+                            binding.playlistsTV.visibility = View.GONE
+                        }
+                    }
+                })
         }
     }
 }

app/src/main/java/com/github/libretube/ui/models/HomeModel.kt

@@ -7,6 +7,7 @@ import com.github.libretube.api.RetrofitInstance
 import com.github.libretube.api.obj.Playlists
 import com.github.libretube.api.obj.StreamItem
 import com.github.libretube.extensions.toastFromMainThread
+import com.github.libretube.ui.extensions.withMaxSize
 import com.github.libretube.util.PreferenceHelper
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -21,15 +22,26 @@ class HomeModel : ViewModel() {
         val token = PreferenceHelper.getToken()
         val appContext = context.applicationContext
         runOrError(appContext) {
-            trending.postValue(RetrofitInstance.api.getTrending(trendingRegion))
+            if (trending.value.isNullOrEmpty()) {
+                trending.postValue(
+                    RetrofitInstance.api.getTrending(trendingRegion).withMaxSize(20)
+                )
+            }
         }
 
         runOrError(appContext) {
-            feed.postValue(RetrofitInstance.authApi.getFeed(token))
+            if (feed.value.isNullOrEmpty()) {
+                feed.postValue(
+                    RetrofitInstance.authApi.getFeed(token).withMaxSize(20)
+                )
+            }
         }
 
         runOrError(appContext) {
-            playlists.postValue(RetrofitInstance.authApi.getUserPlaylists(token))
+            if (token == "" || !playlists.value.isNullOrEmpty()) return@runOrError
+            playlists.postValue(
+                RetrofitInstance.authApi.getUserPlaylists(token).withMaxSize(20)
+            )
         }
     }
 

app/src/main/res/layout/fragment_home.xml

@@ -1,40 +1,64 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
+    android:layout_height="match_parent">
-    android:orientation="vertical">
 
-    <TextView
+    <ProgressBar
-        android:id="@+id/featuredTV"
+        android:id="@+id/progress"
-        style="@style/HomeCategoryTitle"
-        android:text="@string/featured" />
-
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/featuredRV"
         android:layout_width="wrap_content"
-        android:layout_height="210dp"
+        android:layout_height="match_parent"
-        android:layout_marginHorizontal="10dp" />
+        android:layout_gravity="center" />
 
-    <TextView
+    <ScrollView
-        android:id="@+id/trendingTV"
-        style="@style/HomeCategoryTitle"
-        android:text="@string/trending" />
-
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/trendingRV"
         android:layout_width="match_parent"
-        android:layout_height="210dp"
+        android:layout_height="wrap_content">
-        android:layout_marginHorizontal="10dp" />
 
-    <TextView
+        <LinearLayout
-        android:id="@+id/playlistsTV"
+            android:layout_width="match_parent"
-        style="@style/HomeCategoryTitle"
+            android:layout_height="wrap_content"
-        android:text="@string/playlists" />
+            android:orientation="vertical"
+            android:paddingBottom="10dp">
 
-    <androidx.recyclerview.widget.RecyclerView
+            <TextView
-        android:id="@+id/playlistsRV"
+                android:id="@+id/featuredTV"
-        android:layout_width="match_parent"
+                style="@style/HomeCategoryTitle"
-        android:layout_height="210dp"
+                android:text="@string/featured" />
-        android:layout_marginHorizontal="10dp" />
 
-</LinearLayout>
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/featuredRV"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginHorizontal="10dp"
+                android:nestedScrollingEnabled="false"
+                android:visibility="gone" />
+
+            <TextView
+                android:id="@+id/trendingTV"
+                style="@style/HomeCategoryTitle"
+                android:text="@string/trending" />
+
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/trendingRV"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginHorizontal="10dp"
+                android:nestedScrollingEnabled="false"
+                android:visibility="gone" />
+
+            <TextView
+                android:id="@+id/playlistsTV"
+                style="@style/HomeCategoryTitle"
+                android:text="@string/playlists" />
+
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/playlistsRV"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:nestedScrollingEnabled="false"
+                android:visibility="gone" />
+
+        </LinearLayout>
+
+    </ScrollView>
+
+</FrameLayout>

app/src/main/res/values/style.xml

@@ -213,8 +213,8 @@
         <item name="android:textSize">20sp</item>
         <item name="android:textColor">?attr/colorControlNormal</item>
         <item name="android:padding">15dp</item>
-        <item name="background">?attr/selectableItemBackground</item>
+        <item name="android:background">?attr/selectableItemBackground</item>
-        <item name="android:layout_marginTop">10dp</item>
+        <item name="android:visibility">gone</item>
 
     </style>