345 lines
15 KiB
Swift
345 lines
15 KiB
Swift
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// TODO
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// • Tapping replies
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// • Mentions
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// • Remaining send logic
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// • Paging
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// • Blocking
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// • Subtitle
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// • Resending failed messages
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// • Linkification
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// • Link previews
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final class ConversationVC : BaseVC, ConversationViewModelDelegate, UITableViewDataSource, UITableViewDelegate {
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let thread: TSThread
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private let focusedMessageID: String?
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var audioPlayer: OWSAudioPlayer?
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private var didConstrainScrollButton = false
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// Context menu
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var contextMenuWindow: ContextMenuWindow?
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var contextMenuVC: ContextMenuVC?
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// Scrolling & paging
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private var isUserScrolling = false { didSet { autoLoadMoreIfNeeded() } }
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private var hasPerformedInitialScroll = false
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private var isLoadingMore = false
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private var contentOffsetYBeforeUpdate: CGFloat?
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private var contentHeightBeforeUpdate: CGFloat?
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private var dbConnection: YapDatabaseConnection { OWSPrimaryStorage.shared().uiDatabaseConnection }
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var viewItems: [ConversationViewItem] { viewModel.viewState.viewItems }
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func conversationStyle() -> ConversationStyle { return ConversationStyle(thread: thread) }
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override var inputAccessoryView: UIView? { snInputView }
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override var canBecomeFirstResponder: Bool { true }
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private var lastPageTop: CGFloat {
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let bottomInset = -messagesTableView.adjustedContentInset.bottom - ConversationVC.bottomInset
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let tableViewUnobscuredHeight = messagesTableView.bounds.height + bottomInset
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return messagesTableView.contentSize.height - tableViewUnobscuredHeight
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}
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lazy var viewModel = ConversationViewModel(thread: thread, focusMessageIdOnOpen: focusedMessageID, delegate: self)
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private lazy var mediaCache: NSCache<NSString, AnyObject> = {
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let result = NSCache<NSString, AnyObject>()
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result.countLimit = 24
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return result
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}()
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// MARK: UI Components
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lazy var messagesTableView: UITableView = {
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let result = UITableView()
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result.dataSource = self
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result.delegate = self
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result.register(VisibleMessageCell.self, forCellReuseIdentifier: VisibleMessageCell.identifier)
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result.register(InfoMessageCell.self, forCellReuseIdentifier: InfoMessageCell.identifier)
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result.register(TypingIndicatorCellV2.self, forCellReuseIdentifier: TypingIndicatorCellV2.identifier)
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result.separatorStyle = .none
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result.backgroundColor = .clear
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result.contentInset = UIEdgeInsets(top: 0, leading: 0, bottom: ConversationVC.bottomInset, trailing: 0)
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result.showsVerticalScrollIndicator = false
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result.contentInsetAdjustmentBehavior = .never
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result.keyboardDismissMode = .interactive
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return result
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}()
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lazy var snInputView = InputView(delegate: self)
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private lazy var scrollButton = ScrollToBottomButton(delegate: self)
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// MARK: Settings
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private static let bottomInset = Values.mediumSpacing
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private static let loadMoreThreshold: CGFloat = 120
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/// The button will be fully visible once the user has scrolled this amount from the bottom of the table view.
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private static let scrollButtonFullVisibilityThreshold: CGFloat = 80
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/// The button will be invisible until the user has scrolled at least this amount from the bottom of the table view.
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private static let scrollButtonNoVisibilityThreshold: CGFloat = 20
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// MARK: Lifecycle
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init(thread: TSThread, focusedMessageID: String? = nil) {
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self.thread = thread
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self.focusedMessageID = focusedMessageID
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super.init(nibName: nil, bundle: nil)
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}
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required init?(coder: NSCoder) {
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preconditionFailure("Use init(thread:) instead.")
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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// Gradient
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setUpGradientBackground()
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// Nav bar
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setUpNavBarStyle()
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setNavBarTitle(getTitle())
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updateNavBarButtons()
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// Constraints
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view.addSubview(messagesTableView)
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messagesTableView.pin(to: view)
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view.addSubview(scrollButton)
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scrollButton.pin(.right, to: .right, of: view, withInset: -Values.mediumSpacing)
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// Notifications
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let notificationCenter = NotificationCenter.default
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notificationCenter.addObserver(self, selector: #selector(handleKeyboardWillChangeFrameNotification(_:)), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
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notificationCenter.addObserver(self, selector: #selector(handleKeyboardWillHideNotification(_:)), name: UIResponder.keyboardWillHideNotification, object: nil)
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notificationCenter.addObserver(self, selector: #selector(handleAudioDidFinishPlayingNotification(_:)), name: .SNAudioDidFinishPlaying, object: nil)
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}
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override func viewDidLayoutSubviews() {
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super.viewDidLayoutSubviews()
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if !hasPerformedInitialScroll {
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scrollToBottom(isAnimated: false)
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hasPerformedInitialScroll = true
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}
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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guard let lastSortID = viewItems.last?.interaction.sortId else { return }
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OWSReadReceiptManager.shared().markAsReadLocally(beforeSortId: lastSortID, thread: thread)
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}
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override func viewDidDisappear(_ animated: Bool) {
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super.viewDidDisappear(animated)
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mediaCache.removeAllObjects()
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}
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deinit {
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NotificationCenter.default.removeObserver(self)
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}
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// MARK: Table View Data Source
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func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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return viewItems.count
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}
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func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
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let viewItem = viewItems[indexPath.row]
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let cell = tableView.dequeueReusableCell(withIdentifier: MessageCell.getCellType(for: viewItem).identifier) as! MessageCell
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cell.delegate = self
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cell.viewItem = viewItem
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return cell
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}
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// MARK: Updating
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private func updateNavBarButtons() {
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let rightBarButtonItem: UIBarButtonItem
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if thread is TSContactThread {
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let size = Values.verySmallProfilePictureSize
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let profilePictureView = ProfilePictureView()
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profilePictureView.accessibilityLabel = "Settings button"
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profilePictureView.size = size
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profilePictureView.update(for: thread)
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profilePictureView.set(.width, to: size)
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profilePictureView.set(.height, to: size)
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let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(openSettings))
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profilePictureView.addGestureRecognizer(tapGestureRecognizer)
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rightBarButtonItem = UIBarButtonItem(customView: profilePictureView)
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} else {
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rightBarButtonItem = UIBarButtonItem(image: UIImage(named: "Gear"), style: .plain, target: self, action: #selector(openSettings))
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}
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rightBarButtonItem.accessibilityLabel = "Settings button"
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rightBarButtonItem.isAccessibilityElement = true
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navigationItem.rightBarButtonItem = rightBarButtonItem
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}
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@objc private func handleKeyboardWillChangeFrameNotification(_ notification: Notification) {
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guard let newHeight = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.size.height else { return }
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if !didConstrainScrollButton {
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// Bit of a hack to do this here, but it works out.
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scrollButton.pin(.bottom, to: .bottom, of: view, withInset: -(newHeight + Values.mediumSpacing))
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didConstrainScrollButton = true
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}
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UIView.animate(withDuration: 0.25) {
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self.messagesTableView.contentInset = UIEdgeInsets(top: 0, leading: 0, bottom: newHeight + ConversationVC.bottomInset, trailing: 0)
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self.scrollButton.alpha = 0
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}
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}
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@objc private func handleKeyboardWillHideNotification(_ notification: Notification) {
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UIView.animate(withDuration: 0.25) {
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self.messagesTableView.contentInset = UIEdgeInsets(top: 0, leading: 0, bottom: ConversationVC.bottomInset, trailing: 0)
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self.scrollButton.alpha = self.getScrollButtonOpacity()
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}
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}
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func conversationViewModelWillUpdate() {
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}
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func conversationViewModelDidUpdate(_ conversationUpdate: ConversationUpdate) {
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guard self.isViewLoaded else { return }
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// TODO: Reload the thread if it's a group thread?
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let updateType = conversationUpdate.conversationUpdateType
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guard updateType != .minor else { return } // No view items were affected
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if updateType == .reload {
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return messagesTableView.reloadData()
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}
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var shouldScrollToBottom = false
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let shouldAnimate = conversationUpdate.shouldAnimateUpdates
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let batchUpdates: () -> Void = {
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for update in conversationUpdate.updateItems! {
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switch update.updateItemType {
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case .delete:
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self.messagesTableView.deleteRows(at: [ IndexPath(row: Int(update.oldIndex), section: 0) ], with: .fade)
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case .insert:
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// Perform inserts before updates
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self.messagesTableView.insertRows(at: [ IndexPath(row: Int(update.newIndex), section: 0) ], with: .fade)
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let viewItem = update.viewItem
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if viewItem?.interaction is TSOutgoingMessage {
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shouldScrollToBottom = true
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}
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case .update:
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self.messagesTableView.reloadRows(at: [ IndexPath(row: Int(update.oldIndex), section: 0) ], with: .fade)
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default: preconditionFailure()
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}
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}
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}
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let batchUpdatesCompletion: (Bool) -> Void = { isFinished in
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// TODO: Update last visible sort ID?
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if shouldScrollToBottom {
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self.scrollToBottom(isAnimated: true)
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}
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// TODO: Update last known distance from bottom
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}
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if shouldAnimate {
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messagesTableView.performBatchUpdates(batchUpdates, completion: batchUpdatesCompletion)
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} else {
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// HACK: We use `UIView.animateWithDuration:0` rather than `UIView.performWithAnimation` to work around a
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// UIKit Crash like:
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//
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// *** Assertion failure in -[ConversationViewLayout prepareForCollectionViewUpdates:],
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// /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3600.7.47/UICollectionViewLayout.m:760
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// *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'While
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// preparing update a visible view at <NSIndexPath: 0xc000000011c00016> {length = 2, path = 0 - 142}
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// wasn't found in the current data model and was not in an update animation. This is an internal
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// error.'
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//
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// I'm unclear if this is a bug in UIKit, or if we're doing something crazy in
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// ConversationViewLayout#prepareLayout. To reproduce, rapidily insert and delete items into the
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// conversation.
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UIView.animate(withDuration: 0) {
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self.messagesTableView.performBatchUpdates(batchUpdates, completion: batchUpdatesCompletion)
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if shouldScrollToBottom {
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self.scrollToBottom(isAnimated: false)
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}
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}
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}
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// TODO: Set last reload date?
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}
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func conversationViewModelWillLoadMoreItems() {
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contentHeightBeforeUpdate = messagesTableView.contentSize.height
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contentOffsetYBeforeUpdate = messagesTableView.contentOffset.y
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}
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func conversationViewModelDidLoadMoreItems() {
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guard let contentHeightBeforeUpdate = contentHeightBeforeUpdate, let contentOffsetYBeforeUpdate = contentOffsetYBeforeUpdate else { return }
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view.layoutIfNeeded()
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messagesTableView.contentOffset.y = (messagesTableView.contentSize.height - contentHeightBeforeUpdate + contentOffsetYBeforeUpdate)
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isLoadingMore = false
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}
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func conversationViewModelDidLoadPrevPage() {
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}
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func conversationViewModelRangeDidChange() {
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}
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func conversationViewModelDidReset() {
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}
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// MARK: General
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func getMediaCache() -> NSCache<NSString, AnyObject> {
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return mediaCache
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}
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@objc private func handleAudioDidFinishPlayingNotification(_ notification: Notification) {
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guard let audioPlayer = audioPlayer, let viewItem = audioPlayer.owner as? ConversationViewItem,
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let index = viewItems.firstIndex(where: { $0 === viewItem }), index < (viewItems.endIndex - 1) else { return }
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let nextViewItem = viewItems[index + 1]
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guard nextViewItem.messageCellType == .audio else { return }
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playOrPauseAudio(for: nextViewItem)
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}
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func scrollToBottom(isAnimated: Bool) {
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guard !isUserScrolling else { return }
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// Ensure the view is fully up to date before we try to scroll to the bottom, since
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// we use the table view's bounds to determine where the bottom is.
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view.layoutIfNeeded()
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let firstContentPageTop = -messagesTableView.adjustedContentInset.top
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let destinationY = max(firstContentPageTop, lastPageTop)
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messagesTableView.setContentOffset(CGPoint(x: 0, y: destinationY), animated: isAnimated)
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// TODO: Did scroll to bottom
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}
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func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
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isUserScrolling = true
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}
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func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
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isUserScrolling = false
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}
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func scrollViewDidScroll(_ scrollView: UIScrollView) {
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scrollButton.alpha = getScrollButtonOpacity()
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autoLoadMoreIfNeeded()
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}
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private func autoLoadMoreIfNeeded() {
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let isMainAppAndActive = CurrentAppContext().isMainAppAndActive
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guard isMainAppAndActive && viewModel.canLoadMoreItems() && !isLoadingMore
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&& messagesTableView.contentOffset.y < ConversationVC.loadMoreThreshold else { return }
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isLoadingMore = true
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print("[Test] LOAD MORE")
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viewModel.loadAnotherPageOfMessages()
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}
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// MARK: Convenience
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private func getTitle() -> String {
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if let thread = thread as? TSGroupThread {
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return thread.groupModel.groupName!
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} else if thread.isNoteToSelf() {
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return "Note to Self"
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} else {
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let sessionID = thread.contactIdentifier()!
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var result = sessionID
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Storage.read { transaction in
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result = Storage.shared.getContact(with: sessionID)?.displayName ?? "Anonymous"
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}
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return result
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}
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}
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private func getScrollButtonOpacity() -> CGFloat {
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let contentOffsetY = messagesTableView.contentOffset.y
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let x = (lastPageTop - ConversationVC.bottomInset - contentOffsetY).clamp(0, .greatestFiniteMagnitude)
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let a = 1 / (ConversationVC.scrollButtonFullVisibilityThreshold - ConversationVC.scrollButtonNoVisibilityThreshold)
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return a * x
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}
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}
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