Add support for Channel Search in the Channel List

CHANGELOG.md

@@ -3,6 +3,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 # Upcoming
 
+### ✅ Added
+- Add support for Channel Search in the Channel List [#628](https://github.com/GetStream/stream-chat-swiftui/pull/628)
 ### 🐞 Fixed
 - Fix crash when opening message overlay in iPad with a TabBar [#627](https://github.com/GetStream/stream-chat-swiftui/pull/627)
 

DemoAppSwiftUI/DemoAppSwiftUIApp.swift

@@ -18,7 +18,11 @@ struct DemoAppSwiftUIApp: App {
     var channelListController: ChatChannelListController? {
         appState.channelListController
     }
-
+
+    var channelListSearchType: ChannelListSearchType {
+        .messages
+    }
+
     var body: some Scene {
         WindowGroup {
             switch appState.userState {
@@ -64,12 +68,14 @@ struct DemoAppSwiftUIApp: App {
             ChatChannelListView(
                 viewFactory: DemoAppFactory.shared,
                 channelListController: channelListController,
-                selectedChannelId: notificationsHandler.notificationChannelId
+                selectedChannelId: notificationsHandler.notificationChannelId,
+                searchType: channelListSearchType
             )
         } else {
             ChatChannelListView(
                 viewFactory: DemoAppFactory.shared,
-                channelListController: channelListController
+                channelListController: channelListController,
+                searchType: channelListSearchType
             )
         }
     }

Sources/StreamChatSwiftUI/ChatChannelList/ChatChannelListView.swift

@@ -19,7 +19,7 @@ public struct ChatChannelListView<Factory: ViewFactory>: View {
     private let customOnItemTap: ((ChatChannel) -> Void)?
     private var embedInNavigationView: Bool
     private var handleTabBarVisibility: Bool
-    
+
     /// Creates a channel list view.
     ///
     /// - Parameters:
@@ -31,6 +31,7 @@ public struct ChatChannelListView<Factory: ViewFactory>: View {
     ///   - selectedChannelId: The id of a channel to be opened after the initial channel list load.
     ///   - handleTabBarVisibility: True, if TabBar visibility should be automatically updated.
     ///   - embedInNavigationView: True, if the channel list view should be embedded in a navigation stack.
+    ///   - searchType: The type of data the channel list should perform a search. By default it searches messages.
     ///
     /// Changing the instance of the passed in `viewModel` or `channelListController` does not have an effect without reloading the channel list view by assigning a custom identity. The custom identity should be refreshed when either of the passed in instances have been recreated.
     /// ```swift
@@ -47,12 +48,14 @@ public struct ChatChannelListView<Factory: ViewFactory>: View {
         onItemTap: ((ChatChannel) -> Void)? = nil,
         selectedChannelId: String? = nil,
         handleTabBarVisibility: Bool = true,
-        embedInNavigationView: Bool = true
+        embedInNavigationView: Bool = true,
+        searchType: ChannelListSearchType = .messages
     ) {
         _viewModel = StateObject(
             wrappedValue: viewModel ?? ViewModelsFactory.makeChannelListViewModel(
                 channelListController: channelListController,
-                selectedChannelId: selectedChannelId
+                selectedChannelId: selectedChannelId,
+                searchType: searchType
             )
         )
         self.viewFactory = viewFactory

Sources/StreamChatSwiftUI/ChatChannelList/ChatChannelListViewModel.swift

@@ -30,8 +30,6 @@ open class ChatChannelListViewModel: ObservableObject, ChatChannelListController
     /// Temporarly holding changes while message list is shown.
     private var queuedChannelsChanges = LazyCachedMapCollection<ChatChannel>()
 
-    private var messageSearchController: ChatMessageSearchController?
-
     private var timer: Timer?
 
     /// Controls loading the channels.
@@ -103,6 +101,13 @@ open class ChatChannelListViewModel: ObservableObject, ChatChannelListController
         }
     }
 
+    private let searchType: ChannelListSearchType
+    internal var channelListSearchController: ChatChannelListController?
+    internal var messageSearchController: ChatMessageSearchController?
+
+    @Published public var loadingSearchResults = false
+    @Published public var searchResults = [ChannelSelectionInfo]()
+    @Published var hideTabBar = false
     @Published public var searchText = "" {
         didSet {
             if searchText != oldValue {
@@ -111,10 +116,6 @@ open class ChatChannelListViewModel: ObservableObject, ChatChannelListController
         }
     }
 
-    @Published public var loadingSearchResults = false
-    @Published public var searchResults = [ChannelSelectionInfo]()
-    @Published var hideTabBar = false
-
     public var isSearching: Bool {
         !searchText.isEmpty
     }
@@ -125,10 +126,13 @@ open class ChatChannelListViewModel: ObservableObject, ChatChannelListController
     ///   - channelListController: A controller providing the list of channels. If nil, a controller with default `ChannelListQuery` is created.
     ///   - selectedChannelId: The id of a channel to select. If the channel is not part of the channel list query, no channel is selected.
     ///   Consider using ``ChatChannelScreen`` for presenting channels what might not be part of the initial page of channels.
+    ///   - searchType: The type of data the channel list should perform a search.
     public init(
         channelListController: ChatChannelListController? = nil,
-        selectedChannelId: String? = nil
+        selectedChannelId: String? = nil,
+        searchType: ChannelListSearchType = .channels
     ) {
+        self.searchType = searchType
         self.selectedChannelId = selectedChannelId
         if let channelListController = channelListController {
             controller = channelListController
@@ -168,21 +172,13 @@ open class ChatChannelListViewModel: ObservableObject, ChatChannelListController
     }
 
     public func loadAdditionalSearchResults(index: Int) {
-        guard let messageSearchController = messageSearchController else {
-            return
-        }
-
-        if index < messageSearchController.messages.count - 10 {
-            return
-        }
-
-        if !loadingNextChannels {
-            loadingNextChannels = true
-            messageSearchController.loadNextMessages { [weak self] _ in
-                guard let self = self else { return }
-                self.loadingNextChannels = false
-                self.updateSearchResults()
-            }
+        switch searchType {
+        case .channels:
+            loadAdditionalChannelSearchResults(index: index)
+        case .messages:
+            loadAdditionalMessageSearchResults(index: index)
+        default:
+            break
         }
     }
 
@@ -258,7 +254,7 @@ open class ChatChannelListViewModel: ObservableObject, ChatChannelListController
     // MARK: - ChatMessageSearchControllerDelegate
 
     public func controller(_ controller: ChatMessageSearchController, didChangeMessages changes: [ListChange<ChatMessage>]) {
-        updateSearchResults()
+        updateMessageSearchResults()
     }
 
     // MARK: - private
@@ -340,7 +336,93 @@ open class ChatChannelListViewModel: ObservableObject, ChatChannelListController
             .filter { $0.id != chatClient.currentUserId }
     }
 
-    private func updateSearchResults() {
+    private func handleSearchTextChange() {
+        if searchText.isEmpty {
+            clearSearchResults()
+            return
+        }
+
+        switch searchType {
+        case .messages:
+            performMessageSearch()
+        case .channels:
+            performChannelSearch()
+        default:
+            break
+        }
+    }
+
+    private func loadAdditionalMessageSearchResults(index: Int) {
+        guard let messageSearchController = messageSearchController else {
+            return
+        }
+
+        if index < messageSearchController.messages.count - 10 {
+            return
+        }
+
+        if !loadingNextChannels {
+            loadingNextChannels = true
+            messageSearchController.loadNextMessages { [weak self] _ in
+                guard let self = self else { return }
+                self.loadingNextChannels = false
+                self.updateMessageSearchResults()
+            }
+        }
+    }
+
+    private func loadAdditionalChannelSearchResults(index: Int) {
+        guard let channelListSearchController = self.channelListSearchController else {
+            return
+        }
+
+        if index < channelListSearchController.channels.count - 10 {
+            return
+        }
+
+        if !loadingNextChannels {
+            loadingNextChannels = true
+            channelListSearchController.loadNextChannels { [weak self] _ in
+                guard let self = self else { return }
+                self.loadingNextChannels = false
+                self.updateChannelSearchResults()
+            }
+        }
+    }
+
+    private func performMessageSearch() {
+        guard let userId = chatClient.currentUserId else { return }
+        messageSearchController = chatClient.messageSearchController()
+        messageSearchController?.delegate = self
+        let query = MessageSearchQuery(
+            channelFilter: .containMembers(userIds: [userId]),
+            messageFilter: .autocomplete(.text, text: searchText)
+        )
+        loadingSearchResults = true
+        messageSearchController?.search(query: query, completion: { [weak self] _ in
+            self?.loadingSearchResults = false
+            self?.updateMessageSearchResults()
+        })
+    }
+
+    private func performChannelSearch() {
+        guard let userId = chatClient.currentUserId else { return }
+        var query = ChannelListQuery(
+            filter: .and([
+                .autocomplete(.name, text: searchText),
+                .containMembers(userIds: [userId])
+            ])
+        )
+        query.options = []
+        channelListSearchController = chatClient.channelListController(query: query)
+        loadingSearchResults = true
+        channelListSearchController?.synchronize { [weak self] _ in
+            self?.loadingSearchResults = false
+            self?.updateChannelSearchResults()
+        }
+    }
+
+    private func updateMessageSearchResults() {
         guard let messageSearchController = messageSearchController else {
             return
         }
@@ -351,26 +433,28 @@ open class ChatChannelListViewModel: ObservableObject, ChatChannelListController
             }
     }
 
-    private func handleSearchTextChange() {
-        if !searchText.isEmpty {
-            guard let userId = chatClient.currentUserId else { return }
-            messageSearchController = chatClient.messageSearchController()
-            messageSearchController?.delegate = self
-            let query = MessageSearchQuery(
-                channelFilter: .containMembers(userIds: [userId]),
-                messageFilter: .autocomplete(.text, text: searchText)
-            )
-            loadingSearchResults = true
-            messageSearchController?.search(query: query, completion: { [weak self] _ in
-                self?.loadingSearchResults = false
-                self?.updateSearchResults()
-            })
-        } else {
-            messageSearchController?.delegate = nil
-            messageSearchController = nil
-            searchResults = []
-            updateChannels()
+    private func updateChannelSearchResults() {
+        guard let channelListSearchController = self.channelListSearchController else {
+            return
         }
+
+        searchResults = channelListSearchController.channels
+            .compactMap { channel in
+                ChannelSelectionInfo(
+                    channel: channel,
+                    message: channel.previewMessage,
+                    searchType: .channels
+                )
+            }
+    }
+
+    private func clearSearchResults() {
+        messageSearchController?.delegate = nil
+        messageSearchController = nil
+        channelListSearchController?.delegate = nil
+        channelListSearchController = nil
+        searchResults = []
+        updateChannels()
     }
 
     private func observeClientIdChange() {
@@ -491,3 +575,15 @@ public enum ChannelPopupType {
     /// Shows the 'more actions' popup.
     case moreActions(ChatChannel)
 }
+
+/// The type of data the channel list should perform a search.
+public struct ChannelListSearchType: Equatable {
+    let type: String
+
+    private init(type: String) {
+        self.type = type
+    }
+
+    public static var channels = Self(type: "channels")
+    public static var messages = Self(type: "messages")
+}

Sources/StreamChatSwiftUI/ChatChannelList/ChatChannelNavigatableListItem.swift

@@ -73,10 +73,16 @@ public struct ChannelSelectionInfo: Identifiable {
     public let channel: ChatChannel
     public let message: ChatMessage?
     public var injectedChannelInfo: InjectedChannelInfo?
+    public var searchType: ChannelListSearchType
 
-    public init(channel: ChatChannel, message: ChatMessage?) {
+    public init(
+        channel: ChatChannel,
+        message: ChatMessage?,
+        searchType: ChannelListSearchType = .messages
+    ) {
         self.channel = channel
         self.message = message
+        self.searchType = searchType
         if let message = message {
             id = "\(channel.cid.id)-\(message.id)"
         } else {

Sources/StreamChatSwiftUI/ChatChannelList/SearchResultsView.swift

@@ -143,7 +143,7 @@ struct SearchResultItem<ChannelDestination: View>: View {
                     ChatTitleView(name: channelName)
 
                     HStack {
-                        SubtitleText(text: searchResult.message?.text ?? "")
+                        SubtitleText(text: messageText)
                         Spacer()
                         SubtitleText(text: timestampText)
                     }
@@ -161,4 +161,18 @@ struct SearchResultItem<ChannelDestination: View>: View {
             return ""
         }
     }
+
+    private var messageText: String {
+        switch searchResult.searchType {
+        case .channels:
+            guard let previewMessage = searchResult.message else {
+                return L10n.Channel.Item.emptyMessages
+            }
+            return utils.messagePreviewFormatter.format(previewMessage)
+        case .messages:
+            return searchResult.message?.text ?? ""
+        default:
+            return ""
+        }
+    }
 }

Sources/StreamChatSwiftUI/ViewModelsFactory.swift

@@ -14,14 +14,17 @@ public class ViewModelsFactory {
     /// - Parameters:
     ///    - channelListController: possibility to inject custom channel list controller.
     ///    - selectedChannelId: pre-selected channel id (used for deeplinking).
+    ///    - searchType: The type of data the channel list should perform a search. By default it searches messages.
     /// - Returns: `ChatChannelListViewModel`.
     public static func makeChannelListViewModel(
         channelListController: ChatChannelListController? = nil,
-        selectedChannelId: String? = nil
+        selectedChannelId: String? = nil,
+        searchType: ChannelListSearchType = .messages
     ) -> ChatChannelListViewModel {
         ChatChannelListViewModel(
             channelListController: channelListController,
-            selectedChannelId: selectedChannelId
+            selectedChannelId: selectedChannelId,
+            searchType: searchType
         )
     }