Movies: convert collection and watchlist to paging

app/src/main/java/com/battlelancer/seriesguide/movies/MoviesActivityImpl.kt

@@ -1,6 +1,6 @@
-// Copyright 2013-2023 Uwe Trottmann
-// Copyright 2017 Christophe Beyls
 // SPDX-License-Identifier: Apache-2.0
+// Copyright 2013-2024 Uwe Trottmann
+// Copyright 2017 Christophe Beyls
 
 package com.battlelancer.seriesguide.movies
 
@@ -172,11 +172,8 @@ open class MoviesActivityImpl : BaseTopActivity() {
     }
 
     companion object {
-        //        const val SEARCH_LOADER_ID = 100
         const val NOW_TRAKT_USER_LOADER_ID = 101
         const val NOW_TRAKT_FRIENDS_LOADER_ID = 102
-        const val WATCHLIST_LOADER_ID = 103
-        const val COLLECTION_LOADER_ID = 104
 
         const val TAB_POSITION_DISCOVER = 0
         const val TAB_POSITION_WATCHLIST_DEFAULT = 1

app/src/main/java/com/battlelancer/seriesguide/movies/MoviesBaseFragment.kt

@@ -1,94 +1,105 @@
-// Copyright 2023 Uwe Trottmann
 // SPDX-License-Identifier: Apache-2.0
+// Copyright 2019-2024 Uwe Trottmann
 
 package com.battlelancer.seriesguide.movies
 
-import android.database.Cursor
 import android.os.Bundle
 import android.view.View
-import android.widget.GridView
 import android.widget.TextView
 import androidx.annotation.StringRes
-import androidx.core.view.ViewCompat
+import androidx.core.view.isGone
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.ViewModelProvider
-import androidx.loader.app.LoaderManager
-import androidx.loader.content.Loader
-import com.battlelancer.seriesguide.movies.MoviesDistillationSettings.MoviesSortOrderChangedEvent
+import androidx.lifecycle.lifecycleScope
+import androidx.recyclerview.widget.RecyclerView
+import com.battlelancer.seriesguide.R
+import com.battlelancer.seriesguide.ui.AutoGridLayoutManager
 import com.battlelancer.seriesguide.ui.MoviesActivity
+import com.battlelancer.seriesguide.ui.widgets.SgFastScroller
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.conflate
+import kotlinx.coroutines.launch
 import org.greenrobot.eventbus.EventBus
 import org.greenrobot.eventbus.Subscribe
 import org.greenrobot.eventbus.ThreadMode
 
 /**
- * A shell for a fragment displaying a number of movies.
+ * Base class for a fragment displaying movies.
  */
-abstract class MoviesBaseFragment : Fragment(), LoaderManager.LoaderCallbacks<Cursor> {
+abstract class MoviesBaseFragment : Fragment() {
 
-    private lateinit var adapter: MoviesCursorAdapter
+    private lateinit var adapter: MoviesWatchedAdapter
 
-    /**
-     * Return a loader id different from any other used within [com.battlelancer.seriesguide.ui.MoviesActivity].
-     */
-    abstract val loaderId: Int
+    abstract val model: MoviesWatchedViewModel
 
     @get:StringRes
     abstract val emptyViewTextResId: Int
 
-    abstract val gridView: GridView
+    abstract val recyclerView: RecyclerView
 
     abstract val emptyView: TextView
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-
+        // note: fragment is in static view pager tab so will never be destroyed if swiped away
         EventBus.getDefault().register(this)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
-        // enable app bar scrolling out of view
-        ViewCompat.setNestedScrollingEnabled(gridView, true)
-
         emptyView.setText(emptyViewTextResId)
-        gridView.emptyView = emptyView
 
-        ViewModelProvider(requireActivity()).get(MoviesActivityViewModel::class.java)
+        adapter = MoviesWatchedAdapter(requireContext(), MovieClickListenerImpl(requireContext()))
+
+        recyclerView.also {
+            it.setHasFixedSize(true)
+            it.layoutManager =
+                AutoGridLayoutManager(
+                    context, R.dimen.movie_grid_columnWidth, 1, 3
+                )
+            it.adapter = adapter
+            SgFastScroller(requireContext(), it)
+        }
+
+        requireActivity().addMenuProvider(
+            MoviesOptionsMenu(requireActivity()),
+            viewLifecycleOwner,
+            Lifecycle.State.RESUMED
+        )
+
+        ViewModelProvider(requireActivity())[MoviesActivityViewModel::class.java]
             .scrollTabToTopLiveData
             .observe(viewLifecycleOwner) {
                 if (it != null) {
                     if (it.tabPosition == getTabPosition(it.isShowingNowTab)) {
-                        gridView.smoothScrollToPosition(0)
+                        recyclerView.scrollToPosition(0)
                     }
                 }
             }
 
-        adapter = MoviesCursorAdapter(
-            requireContext(), MovieClickListenerImpl(requireContext()),
-            loaderId
-        )
-        gridView.adapter = adapter
-
-        requireActivity().addMenuProvider(
-            MoviesOptionsMenu(requireActivity()),
-            viewLifecycleOwner,
-            Lifecycle.State.RESUMED
-        )
+        viewLifecycleOwner.lifecycleScope.launch {
+            adapter.onPagesUpdatedFlow.conflate().collectLatest {
+                emptyView.isGone = adapter.itemCount > 0
+            }
+        }
 
-        LoaderManager.getInstance(this).initLoader(loaderId, null, this)
+        viewLifecycleOwner.lifecycleScope.launch {
+            model.items.collectLatest {
+                adapter.submitData(it)
+            }
+        }
     }
 
     override fun onDestroy() {
         super.onDestroy()
-
         EventBus.getDefault().unregister(this)
     }
 
     @Subscribe(threadMode = ThreadMode.MAIN)
-    fun onEventMainThread(@Suppress("UNUSED_PARAMETER") event: MoviesSortOrderChangedEvent) {
-        LoaderManager.getInstance(this).restartLoader(loaderId, null, this)
+    fun onEventMainThread(@Suppress("UNUSED_PARAMETER") event: MoviesDistillationSettings.MoviesSortOrderChangedEvent) {
+        model.updateQueryString()
     }
 
     /**
@@ -97,12 +108,4 @@ abstract class MoviesBaseFragment : Fragment(), LoaderManager.LoaderCallbacks<Cu
      */
     internal abstract fun getTabPosition(showingNowTab: Boolean): Int
 
-    override fun onLoadFinished(loader: Loader<Cursor>, data: Cursor) {
-        adapter.swapCursor(data)
-    }
-
-    override fun onLoaderReset(loader: Loader<Cursor>) {
-        adapter.swapCursor(null)
-    }
-
 }

app/src/main/java/com/battlelancer/seriesguide/movies/MoviesCollectionFragment.kt

@@ -1,32 +1,32 @@
-// Copyright 2023 Uwe Trottmann
 // SPDX-License-Identifier: Apache-2.0
+// Copyright 2019-2020, 2022-2024 Uwe Trottmann
 
 package com.battlelancer.seriesguide.movies
 
-import android.database.Cursor
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.GridView
 import android.widget.TextView
-import androidx.loader.content.CursorLoader
-import androidx.loader.content.Loader
+import androidx.fragment.app.viewModels
+import androidx.recyclerview.widget.RecyclerView
 import com.battlelancer.seriesguide.R
 import com.battlelancer.seriesguide.databinding.FragmentMoviesCollectionBinding
-import com.battlelancer.seriesguide.provider.SeriesGuideContract.Movies
 
 /**
  * Displays the users collection of movies.
  */
 class MoviesCollectionFragment : MoviesBaseFragment() {
 
-    override val loaderId: Int = MoviesActivityImpl.COLLECTION_LOADER_ID
-
     override val emptyViewTextResId = R.string.movies_collection_empty
 
-    override val gridView: GridView
-        get() = binding!!.gridViewMoviesCollection
+    private val _model by viewModels<MoviesCollectionViewModel>()
+
+    override val model: MoviesWatchedViewModel
+        get() = _model
+
+    override val recyclerView: RecyclerView
+        get() = binding!!.recyclerViewMoviesCollection
 
     override val emptyView: TextView
         get() = binding!!.textViewMoviesCollectionEmpty
@@ -42,14 +42,6 @@ class MoviesCollectionFragment : MoviesBaseFragment() {
             .root
     }
 
-    override fun onCreateLoader(id: Int, args: Bundle?): Loader<Cursor> {
-        return CursorLoader(
-            requireContext(), Movies.CONTENT_URI,
-            MoviesCursorAdapter.MoviesQuery.PROJECTION, Movies.SELECTION_COLLECTION, null,
-            MoviesDistillationSettings.getSortQuery(context)
-        )
-    }
-
     override fun getTabPosition(showingNowTab: Boolean): Int {
         return if (showingNowTab) {
             MoviesActivityImpl.TAB_POSITION_COLLECTION_WITH_NOW
@@ -58,7 +50,12 @@ class MoviesCollectionFragment : MoviesBaseFragment() {
         }
     }
 
+    override fun onDestroyView() {
+        super.onDestroyView()
+        binding = null
+    }
+
     companion object {
-        val liftOnScrollTargetViewId = R.id.gridViewMoviesCollection
+        val liftOnScrollTargetViewId = R.id.recyclerViewMoviesCollection
     }
 }

app/src/main/java/com/battlelancer/seriesguide/movies/MoviesCollectionViewModel.kt

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2024 Uwe Trottmann
+
+package com.battlelancer.seriesguide.movies
+
+import android.app.Application
+import com.battlelancer.seriesguide.provider.SeriesGuideContract
+
+class MoviesCollectionViewModel(application: Application) : MoviesWatchedViewModel(application) {
+
+    override val selection: String
+        get() = SeriesGuideContract.Movies.SELECTION_COLLECTION
+
+}