Temp

submodules/Display/Source/ListViewTransactionQueue.swift

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+import Foundation
+import UIKit
+import SwiftSignalKit
+
+public typealias ListViewTransaction = (@escaping () -> Void) -> Void
+
+public final class ListViewTransactionQueue {
+    private var transactions: [ListViewTransaction] = []
+    public final var transactionCompleted: () -> Void = { }
+    
+    public init() {
+    }
+    
+    public func addTransaction(_ transaction: @escaping ListViewTransaction) {
+        precondition(Thread.isMainThread)
+        let beginTransaction = self.transactions.count == 0
+        self.transactions.append(transaction)
+        
+        if beginTransaction {
+            transaction({ [weak self] in
+                precondition(Thread.isMainThread)
+                
+                if Thread.isMainThread {
+                    if let strongSelf = self {
+                        strongSelf.endTransaction()
+                    }
+                } else {
+                    Queue.mainQueue().async {
+                        if let strongSelf = self {
+                            strongSelf.endTransaction()
+                        }
+                    }
+                }
+            })
+        }
+    }
+    
+    private func endTransaction() {
+        precondition(Thread.isMainThread)
+        Queue.mainQueue().async {
+            self.transactionCompleted()
+            if !self.transactions.isEmpty {
+                let _ = self.transactions.removeFirst()
+            }
+            
+            if let nextTransaction = self.transactions.first {
+                nextTransaction({ [weak self] in
+                    precondition(Thread.isMainThread)
+                    
+                    if Thread.isMainThread {
+                        if let strongSelf = self {
+                            strongSelf.endTransaction()
+                        }
+                    } else {
+                        Queue.mainQueue().async {
+                            if let strongSelf = self {
+                                strongSelf.endTransaction()
+                            }
+                        }
+                    }
+                })
+            }
+        }
+    }
+}