680 lines
26 KiB
Swift
680 lines
26 KiB
Swift
import AgentKit
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import AppKit
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import ListViewKit
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import Observation
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import SwiftUI
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import TermindApplication
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import TermindPresentation
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typealias TranscriptEntry = AssistantTranscriptEntry
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@MainActor
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@Observable
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final class TranscriptPresentationState {
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let disclosures = AssistantTranscriptPresentationState()
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private struct MessageEditState {
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var isEditing = false
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var text = ""
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var bubbleWidth: CGFloat = 0
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var revision: UInt64 = 0
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}
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private var messageEdits: [UUID: MessageEditState] = [:]
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private var nextRevision: UInt64 = 1
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func prune(validTimelineIDs: Set<UUID>) {
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disclosures.prune(validTimelineIDs: validTimelineIDs)
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for id in messageEdits.keys where !validTimelineIDs.contains(id) { messageEdits[id] = nil }
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}
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func isEditingMessage(_ id: UUID) -> Bool { messageEdits[id]?.isEditing == true }
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func messageEditText(_ id: UUID) -> String { messageEdits[id]?.text ?? "" }
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func messageBubbleWidth(_ id: UUID) -> CGFloat { messageEdits[id]?.bubbleWidth ?? 0 }
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func beginEditingMessage(_ id: UUID, text: String) {
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var state = messageEdits[id] ?? .init()
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state.isEditing = true
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state.text = text
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state.revision = takeRevision()
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messageEdits[id] = state
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}
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func endEditingMessage(_ id: UUID) {
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var state = messageEdits[id] ?? .init()
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state.isEditing = false
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state.revision = takeRevision()
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messageEdits[id] = state
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}
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func setMessageEditText(_ text: String, for id: UUID) {
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var state = messageEdits[id] ?? .init()
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state.text = text
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state.revision = takeRevision()
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messageEdits[id] = state
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}
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func setMessageBubbleWidth(_ width: CGFloat, for id: UUID) {
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var state = messageEdits[id] ?? .init()
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guard abs(state.bubbleWidth - width) > 0.5 else { return }
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state.bubbleWidth = width
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state.revision = takeRevision()
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messageEdits[id] = state
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}
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func layoutRevision(for ids: Set<UUID>) -> UInt64 {
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ids.reduce(disclosures.layoutRevision(for: ids)) { result, id in
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result &+ (messageEdits[id]?.revision ?? 0)
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}
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}
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private func takeRevision() -> UInt64 {
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defer { nextRevision &+= 1 }
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return nextRevision
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}
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}
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nonisolated struct TranscriptListUpdatePlan: Equatable, Sendable {
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var replacesAll = false
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var updates: [TranscriptEntry] = []
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var appends: [TranscriptEntry] = []
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static func make(old: [TranscriptEntry], new: [TranscriptEntry]) -> Self {
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guard !old.isEmpty else { return .init(replacesAll: true) }
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let count = min(old.count, new.count)
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guard old.prefix(count).map(\.id) == new.prefix(count).map(\.id), new.count >= old.count
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else { return .init(replacesAll: true) }
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return .init(
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updates: zip(old, new).compactMap { $0 == $1 ? nil : $1 },
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appends: Array(new.dropFirst(old.count))
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)
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}
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}
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@MainActor
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struct TranscriptListConfiguration: Equatable {
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let isCompact: Bool
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let showsTerminalActions: Bool
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let isConversationStreaming: Bool
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let locale: Locale
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let reduceMotion: Bool
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let colorScheme: ColorScheme
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var horizontalInset: CGFloat { isCompact ? Metrics.Space.l : Metrics.Space.xl }
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}
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@MainActor
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struct TranscriptListActions {
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var hostName: (UUID) -> String? = { _ in nil }
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var editUserMessage: (UUID, String) -> Void = { _, _ in }
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var forkAssistantMessage: (UUID) -> Void = { _ in }
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var resolvePlan: (UUID, AgentPlan.Outcome) -> Void = { _, _ in }
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var implementPlan: (AgentPlanCard) -> Void = { _ in }
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var canDeliverCommand: () -> Bool = { false }
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var deliverCommand: (String, Bool) -> Void = { _, _ in }
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}
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/// The two places that may render one conversation at the same time.
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///
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/// AppKit views have one superview, so full-screen Assistant and the Workspace
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/// sidebar must never share a cached list even when they show the same chat.
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nonisolated enum TranscriptSurface: Hashable, Sendable {
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case fullScreen
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case sidebar
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}
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nonisolated struct TranscriptCacheKey: Hashable, Sendable {
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let conversationID: UUID
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let surface: TranscriptSurface
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}
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/// One long-lived native transcript and the presentation state measured with it.
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///
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/// SwiftUI owns only the short-lived mount container. The owner lives in the
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/// window cache, so removing Assistant from the destination tree preserves the
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/// list's content offset, measured row heights, and Markdown cache without
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/// asking a hidden page to keep participating in layout.
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@MainActor
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final class PersistentTranscriptListOwner {
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let key: TranscriptCacheKey
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let coordinator = TranscriptListView.Coordinator()
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let presentation = TranscriptPresentationState()
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let listView: ListView<TranscriptEntry>
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private weak var container: TranscriptMountView?
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private var mountConstraints: [NSLayoutConstraint] = []
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private var nextMountOrdinal: UInt64 = 0
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private let didAccess: () -> Void
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private let didUnmount: () -> Void
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private var ownerIdentifier: ObjectIdentifier { ObjectIdentifier(self) }
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var isMounted: Bool { container != nil && listView.superview === container }
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init(
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key: TranscriptCacheKey,
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didAccess: @escaping () -> Void = {},
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didUnmount: @escaping () -> Void = {}
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) {
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self.key = key
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self.didAccess = didAccess
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self.didUnmount = didUnmount
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listView = coordinator.makeListView()
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listView.translatesAutoresizingMaskIntoConstraints = false
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}
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func mount(in newContainer: TranscriptMountView) {
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assignOrdinalIfNeeded(to: newContainer)
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if let currentOrdinal = container?.mountOrdinals[ownerIdentifier],
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let proposedOrdinal = newContainer.mountOrdinals[ownerIdentifier],
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proposedOrdinal < currentOrdinal
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{
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return
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}
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didAccess()
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guard container !== newContainer || listView.superview !== newContainer else { return }
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if let displacedOwner = newContainer.owner, displacedOwner !== self {
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displacedOwner.unmount(from: newContainer)
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}
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NSLayoutConstraint.deactivate(mountConstraints)
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mountConstraints.removeAll(keepingCapacity: true)
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listView.removeFromSuperview()
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container?.owner = nil
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newContainer.owner = self
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newContainer.addSubview(listView)
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mountConstraints = [
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listView.leadingAnchor.constraint(equalTo: newContainer.leadingAnchor),
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listView.trailingAnchor.constraint(equalTo: newContainer.trailingAnchor),
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listView.topAnchor.constraint(equalTo: newContainer.topAnchor),
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listView.bottomAnchor.constraint(equalTo: newContainer.bottomAnchor),
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]
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NSLayoutConstraint.activate(mountConstraints)
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container = newContainer
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}
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func unmount(from oldContainer: TranscriptMountView) {
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guard container === oldContainer, listView.superview === oldContainer else { return }
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NSLayoutConstraint.deactivate(mountConstraints)
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mountConstraints.removeAll(keepingCapacity: true)
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listView.removeFromSuperview()
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oldContainer.owner = nil
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container = nil
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coordinator.suspend()
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didUnmount()
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}
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func update(
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entries: [TranscriptEntry],
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latestUserMessageID: UUID?,
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configuration: TranscriptListConfiguration,
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actions: TranscriptListActions
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) {
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coordinator.update(
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listView: listView,
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entries: entries,
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latestUserMessageID: latestUserMessageID,
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configuration: configuration,
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actions: actions,
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presentation: presentation
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)
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}
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private func assignOrdinalIfNeeded(to container: TranscriptMountView) {
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guard container.mountOrdinals[ownerIdentifier] == nil else { return }
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nextMountOrdinal &+= 1
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container.mountOrdinals[ownerIdentifier] = nextMountOrdinal
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}
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}
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@MainActor
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final class TranscriptMountView: NSView {
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weak var owner: PersistentTranscriptListOwner?
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fileprivate var mountOrdinals: [ObjectIdentifier: UInt64] = [:]
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}
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/// Window-local LRU of native transcript views.
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///
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/// FlowDown keeps one list per conversation. Vela additionally distinguishes
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/// full-screen and sidebar surfaces and caps the combined cache, because each
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/// transcript carries Markdown and row-sizing caches of its own.
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@MainActor
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final class TranscriptListCache {
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static let defaultLimit = 8
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private let limit: Int
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private var owners: [TranscriptCacheKey: PersistentTranscriptListOwner] = [:]
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private var order: [TranscriptCacheKey] = []
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init(limit: Int = defaultLimit) {
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self.limit = max(1, limit)
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}
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func owner(for key: TranscriptCacheKey) -> PersistentTranscriptListOwner {
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if let owner = owners[key] {
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touch(key)
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return owner
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}
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let owner = PersistentTranscriptListOwner(
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key: key,
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didAccess: { [weak self] in self?.touch(key) },
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didUnmount: { [weak self] in self?.trimIfNeeded() }
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)
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owners[key] = owner
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touch(key)
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trimIfNeeded(protecting: key)
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return owner
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}
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func removeConversation(_ id: UUID) {
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let keys = owners.keys.filter { $0.conversationID == id }
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guard !keys.isEmpty else { return }
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let removed = Set(keys)
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for key in keys { owners[key] = nil }
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order.removeAll { removed.contains($0) }
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}
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func cachedOwner(for key: TranscriptCacheKey) -> PersistentTranscriptListOwner? {
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owners[key]
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}
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var count: Int { owners.count }
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private func touch(_ key: TranscriptCacheKey) {
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guard owners[key] != nil else { return }
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order.removeAll { $0 == key }
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order.append(key)
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}
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private func trimIfNeeded(protecting protectedKey: TranscriptCacheKey? = nil) {
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while owners.count > limit {
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guard
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let victim = order.first(where: { key in
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key != protectedKey && owners[key]?.isMounted == false
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})
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else { return }
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owners[victim] = nil
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order.removeAll { $0 == victim }
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}
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}
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}
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struct TranscriptListView: NSViewRepresentable {
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typealias NSViewType = TranscriptMountView
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typealias NativeListView = ListView<TranscriptEntry>
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let owner: PersistentTranscriptListOwner
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let entries: [TranscriptEntry]
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let latestUserMessageID: UUID?
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let configuration: TranscriptListConfiguration
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let actions: TranscriptListActions
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func makeCoordinator() -> Coordinator { Coordinator(mountOwner: owner) }
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func makeNSView(context: Context) -> NSViewType {
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let container = TranscriptMountView()
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context.coordinator.mountOwner?.mount(in: container)
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return container
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}
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func updateNSView(_ view: NSViewType, context: Context) {
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context.coordinator.mountOwner?.mount(in: view)
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context.coordinator.mountOwner?.update(
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entries: entries,
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latestUserMessageID: latestUserMessageID,
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configuration: configuration,
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actions: actions
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)
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}
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static func dismantleNSView(_ view: NSViewType, coordinator: Coordinator) {
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coordinator.mountOwner?.unmount(from: view)
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}
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@MainActor
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final class Coordinator: NSObject {
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fileprivate let mountOwner: PersistentTranscriptListOwner?
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private var content: [TranscriptEntry] = []
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private var latestUserMessageID: UUID?
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private var configuration: TranscriptListConfiguration?
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private var actions = TranscriptListActions()
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private weak var presentation: TranscriptPresentationState?
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private weak var listView: NativeListView?
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let markdownCache = TranscriptMarkdownCache(limit: 48)
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let sizingPool = TranscriptRowSizingPool(limit: 12)
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private var invalidations: Set<UUID> = []
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private var invalidationScheduled = false
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private var invalidationMayFollow = false
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private var autoCollapseCheckScheduled = false
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init(mountOwner: PersistentTranscriptListOwner? = nil) {
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self.mountOwner = mountOwner
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super.init()
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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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func makeListView() -> NativeListView {
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let view = NativeListView()
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listView = view
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view.estimatedRowHeight = 96
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view.topInset = Metrics.Space.xl
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view.bottomInset = Metrics.Space.xl
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view.rowAnimator = nil
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view.postsBoundsChangedNotifications = true
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NotificationCenter.default.addObserver(
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self,
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selector: #selector(viewportDidChange),
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name: NSView.boundsDidChangeNotification,
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object: view
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)
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view.rows {
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ListRow(TranscriptEmptyRow.self)
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.when { $0.kind == .empty }
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.estimatedHeight(96)
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.height { [weak self] entry, context in
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self?.height(for: entry, width: context.width) ?? 96
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}
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.configure { [weak self] row, entry, context in
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self?.configure(row, entry: entry, width: context.width, measurement: false)
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}
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ListRow(TranscriptUserRow.self)
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.when { $0.kind == .user }
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.estimatedHeight(96)
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.height { [weak self] entry, context in
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self?.height(for: entry, width: context.width) ?? 96
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}
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.configure { [weak self] row, entry, context in
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self?.configure(row, entry: entry, width: context.width, measurement: false)
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}
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ListRow(TranscriptAssistantRow.self)
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.when { $0.kind == .assistant }
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.estimatedHeight(96)
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.height { [weak self] entry, context in
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self?.height(for: entry, width: context.width) ?? 96
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}
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.configure { [weak self] row, entry, context in
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self?.configure(row, entry: entry, width: context.width, measurement: false)
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}
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ListRow(TranscriptToolRow.self)
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.when { $0.kind == .tool }
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.estimatedHeight(48)
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.height { [weak self] entry, context in
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self?.height(for: entry, width: context.width) ?? 48
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}
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.configure { [weak self] row, entry, context in
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self?.configure(row, entry: entry, width: context.width, measurement: false)
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}
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ListRow(TranscriptWorkRow.self)
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.when { $0.kind == .work }
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.estimatedHeight(72)
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.height { [weak self] entry, context in
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self?.height(for: entry, width: context.width) ?? 72
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}
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.configure { [weak self] row, entry, context in
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self?.configure(row, entry: entry, width: context.width, measurement: false)
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}
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ListRow(TranscriptCommandRow.self)
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.when { $0.kind == .command }
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.estimatedHeight(160)
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.height { [weak self] entry, context in
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self?.height(for: entry, width: context.width) ?? 160
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}
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.configure { [weak self] row, entry, context in
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self?.configure(row, entry: entry, width: context.width, measurement: false)
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}
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ListRow(TranscriptPlanRow.self)
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.when { $0.kind == .plan }
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.estimatedHeight(180)
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.height { [weak self] entry, context in
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self?.height(for: entry, width: context.width) ?? 180
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}
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.configure { [weak self] row, entry, context in
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self?.configure(row, entry: entry, width: context.width, measurement: false)
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}
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ListRow(TranscriptCompactionRow.self)
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.when { $0.kind == .compaction }
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.estimatedHeight(32)
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.height { [weak self] entry, context in
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self?.height(for: entry, width: context.width) ?? 32
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}
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.configure { [weak self] row, entry, context in
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self?.configure(row, entry: entry, width: context.width, measurement: false)
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}
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ListRow(TranscriptCompactionActivityRow.self)
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.when { $0.kind == .compactionActivity }
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.estimatedHeight(48)
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.height { [weak self] entry, context in
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self?.height(for: entry, width: context.width) ?? 48
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}
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.configure { [weak self] row, entry, context in
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self?.configure(row, entry: entry, width: context.width, measurement: false)
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}
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ListRow(TranscriptInterruptedRow.self)
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.when { $0.kind == .interrupted }
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.estimatedHeight(96)
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.height { [weak self] entry, context in
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self?.height(for: entry, width: context.width) ?? 96
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}
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.configure { [weak self] row, entry, context in
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self?.configure(
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row,
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entry: entry,
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width: context.width,
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measurement: false
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)
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}
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}
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return view
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}
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func update(
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listView: NativeListView,
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entries: [TranscriptEntry],
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latestUserMessageID: UUID?,
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configuration: TranscriptListConfiguration,
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actions: TranscriptListActions,
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presentation: TranscriptPresentationState
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) {
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applyUpdate(
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listView: listView,
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entries: entries,
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latestUserMessageID: latestUserMessageID,
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configuration: configuration,
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actions: actions,
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presentation: presentation
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)
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}
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/// Cached transcripts keep their data and measurements while detached,
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/// but surface-owned actions must not retain a window or conversation.
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func suspend() {
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actions = .init()
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}
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private func applyUpdate(
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listView: NativeListView,
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entries: [TranscriptEntry],
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latestUserMessageID: UUID?,
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configuration: TranscriptListConfiguration,
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actions: TranscriptListActions,
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presentation: TranscriptPresentationState
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) {
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let oldConfiguration = self.configuration
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self.configuration = configuration
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self.actions = actions
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self.presentation = presentation
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guard
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content != entries || self.latestUserMessageID != latestUserMessageID
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|| oldConfiguration != configuration
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else { return }
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let validPresentationIDs = entries.reduce(into: Set<UUID>()) {
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$0.formUnion($1.presentationIDs)
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}
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presentation.prune(validTimelineIDs: validPresentationIDs)
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let validEntryIDs = Set(entries.map(\.id))
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markdownCache.prune(validEntryIDs: validEntryIDs)
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sizingPool.prune(validEntryIDs: validEntryIDs)
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let first = content.isEmpty
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let userSent =
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self.latestUserMessageID != latestUserMessageID
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&& latestUserMessageID != nil
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let follow =
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first || userSent
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|| (listView.isScrolledToBottom(tolerance: Metrics.Space.l)
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&& !listView.isUserInteractingWithScroll)
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if oldConfiguration != configuration {
|
|
sizingPool.removeAll()
|
|
listView.reloadData()
|
|
}
|
|
prepareWorkCompletionTransitions(
|
|
from: content,
|
|
to: entries,
|
|
in: listView,
|
|
presentation: presentation
|
|
)
|
|
let plan = TranscriptListUpdatePlan.make(old: content, new: entries)
|
|
if plan.replacesAll {
|
|
if !content.isEmpty { sizingPool.removeAll() }
|
|
listView.apply(entries)
|
|
} else {
|
|
for entry in plan.updates {
|
|
sizingPool.invalidate(entry.id)
|
|
listView.update(entry)
|
|
}
|
|
if !plan.appends.isEmpty { listView.append(contentsOf: plan.appends) }
|
|
}
|
|
content = entries
|
|
self.latestUserMessageID = latestUserMessageID
|
|
followBottom(listView, if: follow)
|
|
schedulePendingAutoCollapseCheck()
|
|
}
|
|
|
|
/// A successful run is allowed to adopt its collapsed default only
|
|
/// after the row is wholly outside the reader's viewport. Partial
|
|
/// visibility is still visibility: collapsing then would remove words
|
|
/// from under the reader and change the height they are looking at.
|
|
private func prepareWorkCompletionTransitions(
|
|
from old: [TranscriptEntry],
|
|
to new: [TranscriptEntry],
|
|
in view: NativeListView,
|
|
presentation: TranscriptPresentationState
|
|
) {
|
|
presentation.disclosures.prepareWorkCompletionTransitions(
|
|
from: old, to: new,
|
|
visibleIDs: Set(old.filter { rowIntersectsViewport($0.id, in: view) }.map(\.id))
|
|
)
|
|
}
|
|
|
|
@objc private func viewportDidChange() {
|
|
schedulePendingAutoCollapseCheck()
|
|
}
|
|
|
|
private func schedulePendingAutoCollapseCheck() {
|
|
guard !autoCollapseCheckScheduled else { return }
|
|
autoCollapseCheckScheduled = true
|
|
DispatchQueue.main.async { [weak self] in
|
|
guard let self else { return }
|
|
autoCollapseCheckScheduled = false
|
|
collapsePendingWorkOutsideViewport()
|
|
}
|
|
}
|
|
|
|
private func collapsePendingWorkOutsideViewport() {
|
|
guard let view = listView, let presentation else { return }
|
|
var collapsed: [UUID] = []
|
|
for entry in content where presentation.disclosures.hasPendingAutoCollapse(entry.id) {
|
|
guard !rowIntersectsViewport(entry.id, in: view),
|
|
presentation.disclosures.completeAutoCollapse(entry.id)
|
|
else { continue }
|
|
collapsed.append(entry.id)
|
|
}
|
|
guard !collapsed.isEmpty else { return }
|
|
for id in collapsed { refreshDisplayedRow(id, in: view) }
|
|
view.layoutSubtreeIfNeeded()
|
|
}
|
|
|
|
private func rowIntersectsViewport(_ id: UUID, in view: NativeListView) -> Bool {
|
|
let row = view.rectForRow(with: id)
|
|
guard !row.isEmpty, view.bounds.width > 0, view.bounds.height > 0 else {
|
|
return false
|
|
}
|
|
let viewport = CGRect(origin: view.contentOffset, size: view.bounds.size)
|
|
return row.intersects(viewport)
|
|
}
|
|
|
|
private func height(for entry: TranscriptEntry, width: CGFloat) -> CGFloat {
|
|
guard let configuration, let presentation else { return 96 }
|
|
return sizingPool.height(
|
|
for: entry,
|
|
width: width,
|
|
configuration: configuration,
|
|
presentation: presentation
|
|
) { [weak self] row in
|
|
self?.configure(row, entry: entry, width: width, measurement: true)
|
|
}
|
|
}
|
|
|
|
private func configure(
|
|
_ row: TranscriptNativeRow,
|
|
entry: TranscriptEntry,
|
|
width: CGFloat,
|
|
measurement: Bool
|
|
) {
|
|
guard let configuration, let presentation else { return }
|
|
row.configure(
|
|
entry: entry,
|
|
proposedWidth: width,
|
|
configuration: configuration,
|
|
actions: measurement ? .init() : actions,
|
|
presentation: presentation,
|
|
markdownCache: markdownCache,
|
|
measurement: measurement
|
|
) { [weak self] id, mayFollow in
|
|
self?.sizingPool.invalidate(id)
|
|
self?.invalidate(id, mayFollow: mayFollow)
|
|
}
|
|
}
|
|
|
|
private func invalidate(_ id: UUID, mayFollow: Bool) {
|
|
invalidations.insert(id)
|
|
invalidationMayFollow = invalidationMayFollow || mayFollow
|
|
guard !invalidationScheduled else { return }
|
|
invalidationScheduled = true
|
|
DispatchQueue.main.async { [weak self] in
|
|
guard let self else { return }
|
|
invalidationScheduled = false
|
|
let ids = invalidations
|
|
invalidations.removeAll()
|
|
let view = listView
|
|
let follow =
|
|
invalidationMayFollow
|
|
&& view?.isScrolledToBottom(tolerance: Metrics.Space.l) == true
|
|
&& view?.isUserInteractingWithScroll == false
|
|
invalidationMayFollow = false
|
|
guard let view else { return }
|
|
for id in ids { refreshDisplayedRow(id, in: view) }
|
|
view.layoutSubtreeIfNeeded()
|
|
followBottom(view, if: follow)
|
|
}
|
|
}
|
|
|
|
func refreshDisplayedRow(_ id: UUID, in view: NativeListView) {
|
|
sizingPool.invalidate(id)
|
|
if let index = content.firstIndex(where: { $0.id == id }),
|
|
let row = view.rowView(for: id) as? TranscriptNativeRow
|
|
{
|
|
configure(
|
|
row,
|
|
entry: content[index],
|
|
width: view.bounds.width,
|
|
measurement: false
|
|
)
|
|
}
|
|
view.invalidateLayout(forRowWith: id)
|
|
}
|
|
|
|
private func followBottom(_ view: NativeListView, if shouldFollow: Bool) {
|
|
guard shouldFollow, !view.isUserInteractingWithScroll else { return }
|
|
view.layoutSubtreeIfNeeded()
|
|
guard !view.isUserInteractingWithScroll else { return }
|
|
view.scrollToBottom(animated: false)
|
|
}
|
|
}
|
|
}
|