Fixes #1198 & 1200: Options - Tablet (Landscape) (Portrait) (Lowfi)

app/src/main/java/org/oppia/app/options/AppLanguageFragmentPresenter.kt

@@ -32,8 +32,7 @@ class AppLanguageFragmentPresenter @Inject constructor(private val fragment: Fra
       adapter = languageSelectionAdapter
     }
 
-    // TODO(#1200): Stop the toolbar functionality in the multipane (add non-null receiver (?)).
-    binding.appLanguageToolbar.setNavigationOnClickListener {
+    binding.appLanguageToolbar?.setNavigationOnClickListener {
       val message = languageSelectionAdapter.getSelectedLanguage()
       val intent = Intent()
       intent.putExtra(KEY_MESSAGE_APP_LANGUAGE, message)

app/src/main/java/org/oppia/app/options/DefaultAudioFragmentPresenter.kt

@@ -33,8 +33,7 @@ class DefaultAudioFragmentPresenter @Inject constructor(private val fragment: Fr
       adapter = languageSelectionAdapter
     }
 
-    // TODO(#1200): Stop the toolbar functionality in the multipane (add non-null receiver (?)).
-    binding.audioLanguageToolbar.setNavigationOnClickListener {
+    binding.audioLanguageToolbar?.setNavigationOnClickListener {
       val message = languageSelectionAdapter.getSelectedLanguage()
       val intent = Intent()
       intent.putExtra(KEY_MESSAGE_AUDIO_LANGUAGE, message)

app/src/main/java/org/oppia/app/options/LoadAppLanguageListListener.kt

@@ -0,0 +1,6 @@
+package org.oppia.app.options
+
+/** Listener for when an activity should load a [AppLanguageFragment]. */
+interface LoadAppLanguageListListener {
+  fun loadAppLanguageFragment(appLanguage: String)
+}

app/src/main/java/org/oppia/app/options/LoadAudioLanguageListListener.kt

@@ -0,0 +1,6 @@
+package org.oppia.app.options
+
+/** Listener for when an activity should load a [DefaultAudioFragment]. */
+interface LoadAudioLanguageListListener {
+  fun loadAudioLanguageFragment(audioLanguage: String)
+}

app/src/main/java/org/oppia/app/options/LoadStoryTextSizeListener.kt

@@ -0,0 +1,6 @@
+package org.oppia.app.options
+
+/** Listener for when an activity should load a [StoryTextSizeFragment]. */
+interface LoadStoryTextSizeListener {
+  fun loadStoryTextSizeFragment(textSize: String)
+}

app/src/main/java/org/oppia/app/options/OptionControlsViewModel.kt

@@ -3,6 +3,7 @@ package org.oppia.app.options
 import androidx.appcompat.app.AppCompatActivity
 import androidx.databinding.ObservableList
 import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.Transformations
 import androidx.lifecycle.ViewModel
 import org.oppia.app.fragment.FragmentScope
@@ -29,6 +30,19 @@ class OptionControlsViewModel @Inject constructor(
   private val routeToStoryTextSizeListener = activity as RouteToStoryTextSizeListener
   private val routeToAudioLanguageListListener = activity as RouteToAudioLanguageListListener
   private val routeToAppLanguageListListener = activity as RouteToAppLanguageListListener
+  private val loadStoryTextSizeListener = activity as LoadStoryTextSizeListener
+  private val loadAudioLanguageListListener = activity as LoadAudioLanguageListListener
+  private val loadAppLanguageListListener = activity as LoadAppLanguageListListener
+  private var isFirstOpen = true
+  val uiLiveData = MutableLiveData<Boolean>()
+
+  /**
+   * Should be called with `false` when the UI starts to load, then with `true` after the UI
+   * finishes loading.
+   */
+  fun isUIInitialized(isInitialized: Boolean) {
+    uiLiveData.value = isInitialized
+  }
 
   private val profileResultLiveData: LiveData<AsyncResult<Profile>> by lazy {
     profileManagementController.getProfile(profileId)
@@ -48,6 +62,10 @@ class OptionControlsViewModel @Inject constructor(
     this.profileId = profileId
   }
 
+  fun getProfileId(): ProfileId {
+    return this.profileId
+  }
+
   private fun processProfileResult(profile: AsyncResult<Profile>): Profile {
     if (profile.isFailure()) {
       logger.e("OptionsFragment", "Failed to retrieve profile", profile.getErrorOrNull()!!)
@@ -60,11 +78,14 @@ class OptionControlsViewModel @Inject constructor(
     itemViewModelList.clear()
 
     val optionsStoryTextSizeViewModel =
-      OptionsStoryTextSizeViewModel(routeToStoryTextSizeListener)
+      OptionsStoryTextSizeViewModel(routeToStoryTextSizeListener, loadStoryTextSizeListener)
     val optionsAppLanguageViewModel =
-      OptionsAppLanguageViewModel(routeToAppLanguageListListener)
+      OptionsAppLanguageViewModel(routeToAppLanguageListListener, loadAppLanguageListListener)
     val optionAudioViewViewModel =
-      OptionsAudioLanguageViewModel(routeToAudioLanguageListListener)
+      OptionsAudioLanguageViewModel(
+        routeToAudioLanguageListListener,
+        loadAudioLanguageListListener
+      )
 
     optionsStoryTextSizeViewModel.storyTextSize.set(getStoryTextSize(profile.storyTextSize))
     optionsAppLanguageViewModel.appLanguage.set(getAppLanguage(profile.appLanguage))
@@ -76,9 +97,23 @@ class OptionControlsViewModel @Inject constructor(
 
     itemViewModelList.add(optionAudioViewViewModel as OptionsItemViewModel)
 
+    // Loading the initial options in the sub-options container
+    if (isMultipane.get()!! && isFirstOpen) {
+      optionsStoryTextSizeViewModel.loadStoryTextSizeFragment()
+      isFirstOpen = false
+    }
+
     return itemViewModelList
   }
 
+  /**
+   * Used to set [isFirstOpen] value which controls the loading of the initial extra-option fragment
+   * in the case of multipane.
+   */
+  fun isFirstOpen(isFirstOpen: Boolean) {
+    this.isFirstOpen = isFirstOpen
+  }
+
   fun getStoryTextSize(storyTextSize: StoryTextSize): String {
     return when (storyTextSize) {
       StoryTextSize.SMALL_TEXT_SIZE -> "Small"

app/src/main/java/org/oppia/app/options/OptionsActivity.kt

@@ -3,19 +3,27 @@ package org.oppia.app.options
 import android.content.Context
 import android.content.Intent
 import android.os.Bundle
+import android.widget.TextView
 import org.oppia.app.R
 import org.oppia.app.activity.InjectableAppCompatActivity
 import org.oppia.app.drawer.KEY_NAVIGATION_PROFILE_ID
 import javax.inject.Inject
 
+private const val SELECTED_OPTIONS_TITLE_KEY = "SELECTED_OPTIONS_TITLE_KEY"
+
 /** The activity for setting user preferences. */
 class OptionsActivity :
   InjectableAppCompatActivity(),
   RouteToAppLanguageListListener,
   RouteToAudioLanguageListListener,
-  RouteToStoryTextSizeListener {
+  RouteToStoryTextSizeListener,
+  LoadStoryTextSizeListener,
+  LoadAppLanguageListListener,
+  LoadAudioLanguageListListener {
   @Inject
   lateinit var optionActivityPresenter: OptionsActivityPresenter
+  // used to initially load the suitable fragment in the case of multipane.
+  private var isFirstOpen = true
 
   companion object {
     // TODO(#1655): Re-restrict access to fields in tests post-Gradle.
@@ -41,7 +49,11 @@ class OptionsActivity :
       BOOL_IS_FROM_NAVIGATION_DRAWER_EXTRA_KEY,
       /* defaultValue= */ false
     )
-    optionActivityPresenter.handleOnCreate(isFromNavigationDrawer)
+    if (savedInstanceState != null) {
+      isFirstOpen = false
+    }
+    val extraOptionsTitle = savedInstanceState?.getString(SELECTED_OPTIONS_TITLE_KEY)
+    optionActivityPresenter.handleOnCreate(isFromNavigationDrawer, extraOptionsTitle, isFirstOpen)
     title = getString(R.string.menu_options)
   }
 
@@ -95,4 +107,27 @@ class OptionsActivity :
       REQUEST_CODE_TEXT_SIZE
     )
   }
+
+  override fun loadStoryTextSizeFragment(textSize: String) {
+    optionActivityPresenter.setExtraOptionTitle(getString(R.string.story_text_size))
+    optionActivityPresenter.loadStoryTextSizeFragment(textSize)
+  }
+
+  override fun loadAppLanguageFragment(appLanguage: String) {
+    optionActivityPresenter.setExtraOptionTitle(getString(R.string.app_language))
+    optionActivityPresenter.loadAppLanguageFragment(appLanguage)
+  }
+
+  override fun loadAudioLanguageFragment(audioLanguage: String) {
+    optionActivityPresenter.setExtraOptionTitle(getString(R.string.audio_language))
+    optionActivityPresenter.loadAudioLanguageFragment(audioLanguage)
+  }
+
+  override fun onSaveInstanceState(outState: Bundle) {
+    super.onSaveInstanceState(outState)
+    val titleTextView = findViewById<TextView>(R.id.options_activity_selected_options_title)
+    if (titleTextView != null) {
+      outState.putString(SELECTED_OPTIONS_TITLE_KEY, titleTextView.text.toString())
+    }
+  }
 }

app/src/main/java/org/oppia/app/options/OptionsActivityPresenter.kt

@@ -1,6 +1,8 @@
 package org.oppia.app.options
 
 import android.view.View
+import android.widget.FrameLayout
+import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.Toolbar
 import androidx.drawerlayout.widget.DrawerLayout
@@ -17,8 +19,17 @@ class OptionsActivityPresenter @Inject constructor(
   private var navigationDrawerFragment: NavigationDrawerFragment? = null
   private lateinit var toolbar: Toolbar
 
-  fun handleOnCreate(isFromNavigationDrawer: Boolean) {
+  fun handleOnCreate(
+    isFromNavigationDrawer: Boolean,
+    extraOptionsTitle: String?,
+    isFirstOpen: Boolean
+  ) {
     activity.setContentView(R.layout.option_activity)
+    val titleTextView =
+      activity.findViewById<TextView>(R.id.options_activity_selected_options_title)
+    if (titleTextView != null) {
+      titleTextView.text = extraOptionsTitle
+    }
     setUpToolbar()
     if (isFromNavigationDrawer) {
       setUpNavigationDrawer()
@@ -28,12 +39,15 @@ class OptionsActivityPresenter @Inject constructor(
         activity.finish()
       }
     }
-    if (getOptionFragment() == null) {
-      activity.supportFragmentManager.beginTransaction().add(
-        R.id.options_fragment_placeholder,
-        OptionsFragment()
-      ).commitNow()
+    val isMultipane = activity.findViewById<FrameLayout>(R.id.multipane_options_container) != null
+    val previousFragment = getOptionFragment()
+    if (previousFragment != null) {
+      activity.supportFragmentManager.beginTransaction().remove(previousFragment).commitNow()
     }
+    activity.supportFragmentManager.beginTransaction().add(
+      R.id.options_fragment_placeholder,
+      OptionsFragment.newInstance(isMultipane, isFirstOpen)
+    ).commitNow()
   }
 
   private fun setUpToolbar() {
@@ -73,4 +87,34 @@ class OptionsActivityPresenter @Inject constructor(
   fun updateAudioLanguage(audioLanguage: String) {
     getOptionFragment()?.updateAudioLanguage(audioLanguage)
   }
+
+  fun loadStoryTextSizeFragment(textSize: String) {
+    val storyTextSizeFragment = StoryTextSizeFragment.newInstance(textSize)
+    activity.supportFragmentManager
+      .beginTransaction()
+      .add(R.id.multipane_options_container, storyTextSizeFragment)
+      .commitNow()
+  }
+
+  fun loadAppLanguageFragment(appLanguage: String) {
+    val appLanguageFragment =
+      AppLanguageFragment.newInstance(APP_LANGUAGE, appLanguage)
+    activity.supportFragmentManager
+      .beginTransaction()
+      .add(R.id.multipane_options_container, appLanguageFragment)
+      .commitNow()
+  }
+
+  fun loadAudioLanguageFragment(audioLanguage: String) {
+    val defaultAudioFragment =
+      DefaultAudioFragment.newInstance(AUDIO_LANGUAGE, audioLanguage)
+    activity.supportFragmentManager
+      .beginTransaction()
+      .add(R.id.multipane_options_container, defaultAudioFragment)
+      .commitNow()
+  }
+
+  fun setExtraOptionTitle(title: String) {
+    activity.findViewById<TextView>(R.id.options_activity_selected_options_title).text = title
+  }
 }

app/src/main/java/org/oppia/app/options/OptionsAppLanguageViewModel.kt

@@ -4,7 +4,8 @@ import androidx.databinding.ObservableField
 
 /** App language settings view model for the recycler view in [OptionsFragment]. */
 class OptionsAppLanguageViewModel(
-  private val routeToAppLanguageListListener: RouteToAppLanguageListListener
+  private val routeToAppLanguageListListener: RouteToAppLanguageListListener,
+  private var loadAppLanguageListListener: LoadAppLanguageListListener
 ) : OptionsItemViewModel() {
   val appLanguage = ObservableField<String>("")
 
@@ -13,6 +14,10 @@ class OptionsAppLanguageViewModel(
   }
 
   fun onAppLanguageClicked() {
-    routeToAppLanguageListListener.routeAppLanguageList(appLanguage.get())
+    if (isMultipane.get()!!) {
+      loadAppLanguageListListener.loadAppLanguageFragment(appLanguage.get()!!)
+    } else {
+      routeToAppLanguageListListener.routeAppLanguageList(appLanguage.get())
+    }
   }
 }

app/src/main/java/org/oppia/app/options/OptionsAudioLanguageViewModel.kt

@@ -4,7 +4,8 @@ import androidx.databinding.ObservableField
 
 /** Audio language settings view model for the recycler view in [OptionsFragment]. */
 class OptionsAudioLanguageViewModel(
-  private val routeToAudioLanguageListListener: RouteToAudioLanguageListListener
+  private val routeToAudioLanguageListListener: RouteToAudioLanguageListListener,
+  private val loadAudioLanguageListListener: LoadAudioLanguageListListener
 ) : OptionsItemViewModel() {
   val audioLanguage = ObservableField<String>("")
 
@@ -13,6 +14,10 @@ class OptionsAudioLanguageViewModel(
   }
 
   fun onAudioLanguageClicked() {
-    routeToAudioLanguageListListener.routeAudioLanguageList(audioLanguage.get())
+    if (isMultipane.get()!!) {
+      loadAudioLanguageListListener.loadAudioLanguageFragment(audioLanguage.get()!!)
+    } else {
+      routeToAudioLanguageListListener.routeAudioLanguageList(audioLanguage.get())
+    }
   }
 }

app/src/main/java/org/oppia/app/options/OptionsFragment.kt

@@ -15,11 +15,25 @@ const val REQUEST_CODE_TEXT_SIZE = 1
 const val REQUEST_CODE_APP_LANGUAGE = 2
 const val REQUEST_CODE_AUDIO_LANGUAGE = 3
 
+private const val IS_MULTIPANE_EXTRA = "IS_MULTIPANE"
+private const val IS_FIRST_OPEN_EXTRA = "IS_FIRST_OPEN_EXTRA"
+
 /** Fragment that contains an introduction to the app. */
 class OptionsFragment : InjectableFragment() {
   @Inject
   lateinit var optionsFragmentPresenter: OptionsFragmentPresenter
 
+  companion object {
+    fun newInstance(isMultipane: Boolean, isFirstOpen: Boolean): OptionsFragment {
+      val args = Bundle()
+      args.putBoolean(IS_MULTIPANE_EXTRA, isMultipane)
+      args.putBoolean(IS_FIRST_OPEN_EXTRA, isFirstOpen)
+      val fragment = OptionsFragment()
+      fragment.arguments = args
+      return fragment
+    }
+  }
+
   override fun onAttach(context: Context) {
     super.onAttach(context)
     fragmentComponent.inject(this)
@@ -30,18 +44,28 @@ class OptionsFragment : InjectableFragment() {
     container: ViewGroup?,
     savedInstanceState: Bundle?
   ): View? {
-    return optionsFragmentPresenter.handleCreateView(inflater, container)
+    val args =
+      checkNotNull(arguments) { "Expected arguments to be passed to OptionsFragment" }
+    val isMultipane = args.getBoolean(IS_MULTIPANE_EXTRA)
+    val isFirstOpen = args.getBoolean(IS_FIRST_OPEN_EXTRA)
+    return optionsFragmentPresenter.handleCreateView(inflater, container, isMultipane, isFirstOpen)
   }
 
   fun updateStoryTextSize(textSize: String) {
-    optionsFragmentPresenter.updateStoryTextSize(textSize)
+    optionsFragmentPresenter.runAfterUIInitialization {
+      optionsFragmentPresenter.updateStoryTextSize(textSize)
+    }
   }
 
   fun updateAppLanguage(appLanguage: String) {
-    optionsFragmentPresenter.updateAppLanguage(appLanguage)
+    optionsFragmentPresenter.runAfterUIInitialization {
+      optionsFragmentPresenter.updateAppLanguage(appLanguage)
+    }
   }
 
   fun updateAudioLanguage(audioLanguage: String) {
-    optionsFragmentPresenter.updateAudioLanguage(audioLanguage)
+    optionsFragmentPresenter.runAfterUIInitialization {
+      optionsFragmentPresenter.updateAudioLanguage(audioLanguage)
+    }
   }
 }