Telegram研究：最近会话记录的头像

ChatListNodeEntries.swift ChatListNode.swift

preparedChatListNodeViewTransition ChatListNodeViewTransitionInsertEntry

ChatListNodeEntry -> ChatListNodeViewTransitionInsertEntry -> ListViewInsertItem -> ChatListItem

mappedInsertEntryies -> ListViewInsertItem -> item -> ChatListItem -> content -> .peer(peer+messages+…) + .groupReference(groupId+peers+message+…)

mappedUpdateEntryies -> ListViewUpdateItem -> item -> ChatListItem -> content

ChatListItem -> nodeConfiguredForParams -> + node.setupItem(item: self, synchronousLoads: synchronousLoads) updateNode -> nodeValue.setupItem(item: self, synchronousLoads: false)

ChatListItemNode-> setupItem -> item.content -> avatarNode.setPeer -> contentNode.setPeer ->

AvatarNode.StoryStats

public enum ChatListItemContent { case loading case peer(PeerData) // 单聊、群聊、频道、私密会话 case groupReference(GroupReferenceData) }

聊天会话里的会话类型，有4类 public enum EnginePeer: Equatable { case user(TelegramUser) // 单聊 case legacyGroup(TelegramGroup) // 传统群 case channel(TelegramChannel) // 频道 case secretChat(TelegramSecretChat) // 加密聊天 }

用户类型 public protocol Peer: AnyObject, PostboxCoding { var id: PeerId { get } var indexName: PeerIndexNameRepresentation { get } var associatedPeerId: PeerId? { get } var notificationSettingsPeerId: PeerId? { get } var associatedMediaIds: [MediaId]? { get } var timeoutAttribute: UInt32? { get }

func isEqual(_ other: Peer) -> Bool } public final class TelegramChannel: Peer, Equatable {} public final class TelegramGroup: Peer, Equatable {} public final class TelegramUser: Peer, Equatable {} public final class TelegramSecretChat: Peer, Equatable {}

item.content -> .peer(peerData) -> .user(author) || peerData.peer.chatMainPeer -> peer.id item.context.account.peerId