Add unread divider decoration to CFv2.

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationData.kt

@@ -14,7 +14,8 @@ data class ConversationData(
   val jumpToPosition: Int,
   val threadSize: Int,
   val messageRequestData: MessageRequestData,
-  @get:JvmName("showUniversalExpireTimerMessage") val showUniversalExpireTimerMessage: Boolean
+  @get:JvmName("showUniversalExpireTimerMessage") val showUniversalExpireTimerMessage: Boolean,
+  val unreadCount: Int
 ) {
 
   fun shouldJumpToMessage(): Boolean {

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationRepository.java

@@ -119,7 +119,7 @@ public class ConversationRepository {
       showUniversalExpireTimerUpdate = true;
     }
 
-    return new ConversationData(conversationRecipient, threadId, lastSeen, lastSeenPosition, lastScrolledPosition, jumpToPosition, threadSize, messageRequestData, showUniversalExpireTimerUpdate);
+    return new ConversationData(conversationRecipient, threadId, lastSeen, lastSeenPosition, lastScrolledPosition, jumpToPosition, threadSize, messageRequestData, showUniversalExpireTimerUpdate, metadata.getUnreadCount());
   }
 
   public void markGiftBadgeRevealed(long messageId) {

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/ConversationFragment.kt

@@ -427,6 +427,7 @@ class ConversationFragment :
   private lateinit var openableGiftItemDecoration: OpenableGiftItemDecoration
   private lateinit var threadHeaderMarginDecoration: ThreadHeaderMarginDecoration
   private lateinit var dateHeaderDecoration: DateHeaderDecoration
+  private lateinit var unreadLineDecoration: UnreadLineDecoration
   private lateinit var optionsMenuCallback: ConversationOptionsMenuCallback
   private lateinit var typingIndicatorDecoration: TypingIndicatorDecoration
 
@@ -563,8 +564,10 @@ class ConversationFragment :
 
     inputPanel.onPause()
 
-    // todo [cfv2] setLastSeen(System.currentTimeMillis())
-    // todo [cfv2] markLastSeen()
+    unreadLineDecoration.unreadCount = viewModel.unreadCount
+    binding.conversationItemRecycler.invalidateItemDecorations()
+
+    viewModel.markLastSeen()
 
     motionEventRelay.setDrain(null)
     EventBus.getDefault().unregister(this)
@@ -719,6 +722,7 @@ class ConversationFragment :
             binding.conversationItemRecycler.height
           )
         }
+        unreadLineDecoration.unreadCount = state.meta.unreadCount
       }
       .flatMapObservable { it.items.data }
       .observeOn(AndroidSchedulers.mainThread())
@@ -748,7 +752,7 @@ class ConversationFragment :
     attachmentManager = AttachmentManager(requireContext(), requireView(), AttachmentManagerListener())
 
     EventBus.getDefault().registerForLifecycle(groupCallViewModel, viewLifecycleOwner)
-    viewLifecycleOwner.lifecycle.addObserver(LastSeenPositionUpdater(adapter, layoutManager, viewModel))
+    viewLifecycleOwner.lifecycle.addObserver(LastScrolledPositionUpdater(adapter, layoutManager, viewModel))
 
     disposables += viewModel.recipient
       .observeOn(AndroidSchedulers.mainThread())
@@ -1147,6 +1151,7 @@ class ConversationFragment :
 
     adapter.onHasWallpaperChanged(wallpaperEnabled)
     dateHeaderDecoration.hasWallpaper = wallpaperEnabled
+    unreadLineDecoration.hasWallpaper = wallpaperEnabled
 
     val navColor = if (wallpaperEnabled) {
       R.color.conversation_navigation_wallpaper
@@ -1371,6 +1376,9 @@ class ConversationFragment :
 
     dateHeaderDecoration = DateHeaderDecoration(hasWallpaper = args.wallpaper != null)
     binding.conversationItemRecycler.addItemDecoration(dateHeaderDecoration, 0)
+
+    unreadLineDecoration = UnreadLineDecoration(hasWallpaper = args.wallpaper != null)
+    binding.conversationItemRecycler.addItemDecoration(unreadLineDecoration)
   }
 
   private fun initializeGiphyMp4(): GiphyMp4ProjectionRecycler {
@@ -1631,7 +1639,7 @@ class ConversationFragment :
       return
     }
 
-    // todo [cfv2] fragment.setLastSeen(0);
+    unreadLineDecoration.unreadCount = 0
 
     scrollToPositionDelegate.resetScrollPosition()
     attachmentManager.cleanup()
@@ -3011,7 +3019,7 @@ class ConversationFragment :
 
   //endregion
 
-  private class LastSeenPositionUpdater(
+  private class LastScrolledPositionUpdater(
     val adapter: ConversationAdapterV2,
     val layoutManager: LinearLayoutManager,
     val viewModel: ConversationViewModel

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/ConversationRepository.kt

@@ -258,7 +258,7 @@ class ConversationRepository(
   }
 
   fun setLastVisibleMessageTimestamp(threadId: Long, lastVisibleMessageTimestamp: Long) {
-    SignalExecutors.BOUNDED.submit { SignalDatabase.threads.setLastScrolled(threadId, lastVisibleMessageTimestamp) }
+    SignalExecutors.BOUNDED_IO.execute { SignalDatabase.threads.setLastScrolled(threadId, lastVisibleMessageTimestamp) }
   }
 
   fun markGiftBadgeRevealed(messageId: Long) {
@@ -575,6 +575,12 @@ class ConversationRepository(
     }
   }
 
+  fun markLastSeen(threadId: Long) {
+    SignalExecutors.BOUNDED_IO.execute {
+      SignalDatabase.threads.setLastSeen(threadId)
+    }
+  }
+
   /**
    * Glide target for a contact photo which expects an error drawable, and publishes
    * the result to the given emitter.

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/ConversationViewModel.kt

@@ -88,6 +88,8 @@ class ConversationViewModel(
     .observeOn(AndroidSchedulers.mainThread())
   val showScrollButtonsSnapshot: Boolean
     get() = scrollButtonStateStore.state.showScrollButtons
+  val unreadCount: Int
+    get() = scrollButtonStateStore.state.unreadCount
 
   val recipient: Observable<Recipient> = recipientRepository.conversationRecipient
 
@@ -395,4 +397,8 @@ class ConversationViewModel(
       .getScheduledMessageCount(threadId)
       .observeOn(AndroidSchedulers.mainThread())
   }
+
+  fun markLastSeen() {
+    repository.markLastSeen(threadId)
+  }
 }

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/DateHeaderDecoration.kt

@@ -9,7 +9,6 @@ import android.graphics.Canvas
 import android.graphics.Rect
 import android.view.LayoutInflater
 import android.view.View
-import android.view.ViewGroup
 import android.widget.TextView
 import androidx.core.content.ContextCompat
 import androidx.recyclerview.widget.RecyclerView
@@ -18,6 +17,8 @@ import org.thoughtcrime.securesms.conversation.v2.data.ConversationMessageElemen
 import org.thoughtcrime.securesms.database.model.MediaMmsMessageRecord
 import org.thoughtcrime.securesms.util.DateUtils
 import org.thoughtcrime.securesms.util.adapter.mapping.MappingModel
+import org.thoughtcrime.securesms.util.drawAsItemDecoration
+import org.thoughtcrime.securesms.util.layoutIn
 import org.thoughtcrime.securesms.util.toLocalDate
 import java.util.Locale
 
@@ -61,12 +62,7 @@ class DateHeaderDecoration(hasWallpaper: Boolean = false, private val scheduleMe
 
       if (hasHeader(position)) {
         val headerView = getHeader(parent, currentItems[position] as ConversationMessageElement).itemView
-        c.save()
-        val left = parent.left
-        val top = child.y.toInt() - headerView.height
-        c.translate(left.toFloat(), top.toFloat())
-        headerView.draw(c)
-        c.restore()
+        headerView.drawAsItemDecoration(c, parent, child)
       }
     }
   }
@@ -102,13 +98,8 @@ class DateHeaderDecoration(hasWallpaper: Boolean = false, private val scheduleMe
       holder
     }
 
-    val headerView = headerHolder.itemView
-    val widthSpec = View.MeasureSpec.makeMeasureSpec(parent.width, View.MeasureSpec.EXACTLY)
-    val heightSpec = View.MeasureSpec.makeMeasureSpec(parent.height, View.MeasureSpec.UNSPECIFIED)
-    val childWidth = ViewGroup.getChildMeasureSpec(widthSpec, parent.paddingLeft + parent.paddingRight, headerView.layoutParams.width)
-    val childHeight = ViewGroup.getChildMeasureSpec(heightSpec, parent.paddingTop + parent.paddingBottom, headerView.layoutParams.height)
-    headerView.measure(childWidth, childHeight)
-    headerView.layout(0, 0, headerView.measuredWidth, headerView.measuredHeight)
+    headerHolder.itemView.layoutIn(parent)
+
     return headerHolder
   }
 

app/src/main/java/org/thoughtcrime/securesms/conversation/v2/UnreadLineDecoration.kt

@@ -0,0 +1,112 @@
+/*
+ * Copyright 2023 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.conversation.v2
+
+import android.graphics.Canvas
+import android.graphics.Rect
+import android.view.LayoutInflater
+import android.view.View
+import android.widget.TextView
+import androidx.core.content.ContextCompat
+import androidx.recyclerview.widget.RecyclerView
+import org.thoughtcrime.securesms.R
+import org.thoughtcrime.securesms.util.drawAsItemDecoration
+import org.thoughtcrime.securesms.util.layoutIn
+
+/**
+ * Renders the unread divider in a conversation list based on the unread count.
+ */
+class UnreadLineDecoration(hasWallpaper: Boolean) : RecyclerView.ItemDecoration() {
+
+  private var unreadViewHolder: UnreadViewHolder? = null
+
+  var unreadCount: Int = 0
+    set(value) {
+      field = value
+      unreadViewHolder?.bind()
+    }
+
+  private val firstUnreadPosition: Int
+    get() = unreadCount - 1
+
+  var hasWallpaper: Boolean = hasWallpaper
+    set(value) {
+      field = value
+      unreadViewHolder?.updateForWallpaper()
+    }
+
+  override fun getItemOffsets(outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State) {
+    if (unreadCount == 0) {
+      super.getItemOffsets(outRect, view, parent, state)
+      return
+    }
+
+    val position = parent.getChildAdapterPosition(view)
+
+    val height = if (position == firstUnreadPosition) {
+      getUnreadViewHolder(parent).height
+    } else {
+      0
+    }
+
+    outRect.set(0, height, 0, 0)
+  }
+
+  override fun onDrawOver(c: Canvas, parent: RecyclerView, state: RecyclerView.State) {
+    for (layoutPosition in 0 until parent.childCount) {
+      val child = parent.getChildAt(layoutPosition)
+      val position = parent.getChildAdapterPosition(child)
+
+      if (position == firstUnreadPosition) {
+        getUnreadViewHolder(parent).itemView.drawAsItemDecoration(c, parent, child)
+        break
+      }
+    }
+  }
+
+  private fun getUnreadViewHolder(parent: RecyclerView): UnreadViewHolder {
+    if (unreadViewHolder != null) {
+      return unreadViewHolder!!
+    }
+
+    unreadViewHolder = UnreadViewHolder(parent)
+    return unreadViewHolder!!
+  }
+
+  private inner class UnreadViewHolder(parent: RecyclerView) {
+    val itemView: View
+
+    private val unreadText: TextView
+    private val unreadDivider: View
+
+    val height: Int
+      get() = itemView.height
+
+    init {
+      itemView = LayoutInflater.from(parent.context).inflate(R.layout.conversation_item_last_seen, parent, false)
+      unreadText = itemView.findViewById(R.id.text)
+      unreadDivider = itemView.findViewById(R.id.last_seen_divider)
+
+      bind()
+      itemView.layoutIn(parent)
+    }
+
+    fun bind() {
+      unreadText.text = itemView.context.resources.getQuantityString(R.plurals.ConversationAdapter_n_unread_messages, unreadCount, unreadCount)
+      updateForWallpaper()
+    }
+
+    fun updateForWallpaper() {
+      if (hasWallpaper) {
+        unreadText.setBackgroundResource(R.drawable.wallpaper_bubble_background_18)
+        unreadDivider.setBackgroundColor(ContextCompat.getColor(itemView.context, R.color.transparent_black_80))
+      } else {
+        unreadText.background = null
+        unreadDivider.setBackgroundColor(ContextCompat.getColor(itemView.context, R.color.core_grey_45))
+      }
+    }
+  }
+}