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submodules/TelegramUI/Sources/ChatHistoryNode.swift

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+import Foundation
+import UIKit
+import AsyncDisplayKit
+import Postbox
+import SwiftSignalKit
+import Display
+
+public enum ChatHistoryNodeHistoryState: Equatable {
+    case loading
+    case loaded(isEmpty: Bool)
+}
+
+public enum ChatHistoryNodeLoadState {
+    case loading
+    case empty
+    case messages
+}
+
+public protocol ChatHistoryNode: class {
+    var historyState: ValuePromise<ChatHistoryNodeHistoryState> { get }
+    var preloadPages: Bool { get set }
+    
+    var loadState: ChatHistoryNodeLoadState? { get }
+    func setLoadStateUpdated(_ f: @escaping (ChatHistoryNodeLoadState, Bool) -> Void)
+    
+    func messageInCurrentHistoryView(_ id: MessageId) -> Message?
+    func updateLayout(transition: ContainedViewLayoutTransition, updateSizeAndInsets: ListViewUpdateSizeAndInsets)
+    func forEachItemNode(_ f: (ASDisplayNode) -> Void)
+    func disconnect()
+    func scrollToEndOfHistory()
+}