refactor: remove callbacks on CommentsSheet

storing fragment callbacks in viewmodels is considered a bad practice because
view models survive longer than fragments

app/src/main/java/com/github/libretube/constants/IntentData.kt

@@ -8,6 +8,7 @@ object IntentData {
     const val videoIds = "videoIds"
     const val channelId = "channelId"
     const val channelName = "channelName"
+    const val channelAvatar = "channelAvatar"
     const val playlistId = "playlistId"
     const val timeStamp = "timeStamp"
     const val playlistType = "playlistType"

app/src/main/java/com/github/libretube/ui/adapters/CommentPagingAdapter.kt

@@ -47,7 +47,11 @@ class CommentPagingAdapter(
             return
         }
 
-        val args = bundleOf(IntentData.videoId to videoId, IntentData.comment to comment)
+        val args = bundleOf(
+            IntentData.videoId to videoId,
+            IntentData.comment to comment,
+            IntentData.channelAvatar to channelAvatar
+        )
         fragment!!.parentFragmentManager.commit {
             replace<CommentsRepliesFragment>(R.id.commentFragContainer, args = args)
             addToBackStack(null)

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

@@ -5,15 +5,18 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.view.ViewTreeObserver
+import androidx.core.os.bundleOf
 import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
+import androidx.fragment.app.setFragmentResult
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.lifecycleScope
 import androidx.lifecycle.repeatOnLifecycle
 import androidx.paging.LoadState
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.github.libretube.R
+import com.github.libretube.constants.IntentData
 import com.github.libretube.databinding.FragmentCommentsBinding
 import com.github.libretube.extensions.formatShort
 import com.github.libretube.ui.adapters.CommentPagingAdapter
@@ -68,10 +71,12 @@ class CommentsMainFragment : Fragment() {
         val commentPagingAdapter = CommentPagingAdapter(
             this,
             viewModel.videoIdLiveData.value ?: return,
-            viewModel.channelAvatar ?: return,
+            requireArguments().getString(IntentData.channelAvatar) ?: return,
-            handleLink = viewModel.handleLink
+            handleLink = {
+                setFragmentResult(CommentsSheet.HANDLE_LINK_REQUEST_KEY, bundleOf(IntentData.url to it))
+            }
         ) {
-            viewModel.commentsSheetDismiss?.invoke()
+            setFragmentResult(CommentsSheet.DISMISS_SHEET_REQUEST_KEY, bundleOf())
         }
         binding.commentsRV.adapter = commentPagingAdapter
 

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

@@ -5,11 +5,13 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.view.ViewTreeObserver
+import androidx.core.os.bundleOf
 import androidx.core.view.isGone
 import androidx.core.view.isVisible
 import androidx.core.view.updatePadding
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
+import androidx.fragment.app.setFragmentResult
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.lifecycleScope
 import androidx.lifecycle.repeatOnLifecycle
@@ -60,13 +62,15 @@ class CommentsRepliesFragment : Fragment() {
         val repliesAdapter = CommentPagingAdapter(
             null,
             videoId,
-            viewModel.channelAvatar,
+            requireArguments().getString(IntentData.channelAvatar) ?: return,
             isRepliesAdapter = true,
-            handleLink = viewModel.handleLink
+            handleLink = {
+                setFragmentResult(CommentsSheet.HANDLE_LINK_REQUEST_KEY, bundleOf(IntentData.url to it))
+            }
         ) {
-            viewModel.commentsSheetDismiss?.invoke()
+            setFragmentResult(CommentsSheet.DISMISS_SHEET_REQUEST_KEY, bundleOf())
         }
-        (parentFragment as CommentsSheet).updateFragmentInfo(
+        commentsSheet?.updateFragmentInfo(
             true,
             "${getString(R.string.replies)} (${comment.replyCount.formatShort()})"
         )

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

@@ -525,14 +525,19 @@ class PlayerFragment : Fragment(), OnlinePlayerOptions {
             exoPlayer.togglePlayPauseState()
         }
 
+        activity?.supportFragmentManager
+            ?.setFragmentResultListener(CommentsSheet.HANDLE_LINK_REQUEST_KEY, viewLifecycleOwner) { _, bundle ->
+                bundle.getString(IntentData.url)?.let { handleLink(it) }
+        }
+
         binding.commentsToggle.setOnClickListener {
             if (!this::streams.isInitialized) return@setOnClickListener
             // set the max height to not cover the currently playing video
-            commentsViewModel.handleLink = this::handleLink
             updateMaxSheetHeight()
             commentsViewModel.videoIdLiveData.updateIfChanged(videoId)
-            commentsViewModel.channelAvatar = streams.uploaderAvatar
+            CommentsSheet()
-            CommentsSheet().show(childFragmentManager)
+                .apply { arguments = bundleOf(IntentData.channelAvatar to streams.uploaderAvatar) }
+                .show(childFragmentManager)
         }
 
         // FullScreen button trigger
@@ -639,7 +644,7 @@ class PlayerFragment : Fragment(), OnlinePlayerOptions {
 
     private fun updateMaxSheetHeight() {
         val maxHeight = binding.root.height - binding.player.height
-        viewModel.maxSheetHeightPx = viewModel.maxSheetHeightPx
+        viewModel.maxSheetHeightPx = maxHeight
         chaptersViewModel.maxSheetHeightPx = maxHeight
     }
 
@@ -1022,7 +1027,8 @@ class PlayerFragment : Fragment(), OnlinePlayerOptions {
         playVideo()
 
         // close comment bottom sheet if opened for next video
-        runCatching { commentsViewModel.commentsSheetDismiss?.invoke() }
+        activity?.supportFragmentManager?.fragments?.filterIsInstance<CommentsSheet>()
+                ?.firstOrNull()?.dismiss()
     }
 
     @SuppressLint("SetTextI18n")

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

@@ -26,17 +26,12 @@ class CommentsViewModel : ViewModel() {
 
     val commentSheetExpand = MutableLiveData<Boolean?>()
 
-    var channelAvatar: String? = null
-    var handleLink: ((url: String) -> Unit)? = null
-
     private val _currentCommentsPosition = MutableLiveData(0)
     val currentCommentsPosition: LiveData<Int> = _currentCommentsPosition
 
     private val _currentRepliesPosition = MutableLiveData(0)
     val currentRepliesPosition: LiveData<Int> = _currentRepliesPosition
 
-    var commentsSheetDismiss: (() -> Unit)? = null
-
     fun setCommentSheetExpand(value: Boolean?) {
         if (commentSheetExpand.value != value) {
             commentSheetExpand.value = value

app/src/main/java/com/github/libretube/ui/sheets/CommentsSheet.kt

@@ -1,6 +1,5 @@
 package com.github.libretube.ui.sheets
 
-import android.content.DialogInterface
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
@@ -9,6 +8,7 @@ import androidx.core.view.isVisible
 import androidx.fragment.app.activityViewModels
 import androidx.fragment.app.commit
 import androidx.fragment.app.replace
+import androidx.fragment.app.setFragmentResult
 import com.github.libretube.R
 import com.github.libretube.databinding.CommentsSheetBinding
 import com.github.libretube.ui.fragments.CommentsMainFragment
@@ -34,10 +34,17 @@ class CommentsSheet : UndimmedBottomSheet() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
-        commentsViewModel.commentsSheetDismiss = this::dismiss
-
         val binding = binding
 
+        childFragmentManager.setFragmentResultListener(DISMISS_SHEET_REQUEST_KEY, viewLifecycleOwner) { _, _ ->
+            dismiss()
+        }
+
+        // forward requests to open links to the parent fragment
+        childFragmentManager.setFragmentResultListener(HANDLE_LINK_REQUEST_KEY, viewLifecycleOwner) { key, result ->
+            parentFragment?.setFragmentResult(key, result)
+        }
+
         binding.btnBack.setOnClickListener {
             if (childFragmentManager.backStackEntryCount > 0) {
                 childFragmentManager.popBackStack()
@@ -47,7 +54,7 @@ class CommentsSheet : UndimmedBottomSheet() {
         binding.btnClose.setOnClickListener { dismiss() }
 
         childFragmentManager.commit {
-            replace<CommentsMainFragment>(R.id.commentFragContainer)
+            replace<CommentsMainFragment>(R.id.commentFragContainer, args = arguments)
         }
 
         commentsViewModel.setCommentSheetExpand(true)
@@ -76,8 +83,8 @@ class CommentsSheet : UndimmedBottomSheet() {
         binding.commentsTitle.text = title
     }
 
-    override fun onDismiss(dialog: DialogInterface) {
+    companion object {
-        super.onDismiss(dialog)
+        const val HANDLE_LINK_REQUEST_KEY = "handle_link_request_key"
-        commentsViewModel.commentsSheetDismiss = null
+        const val DISMISS_SHEET_REQUEST_KEY = "dismiss_sheet_request_key"
     }
 }