104 lines
2.0 KiB
Swift
Executable File
104 lines
2.0 KiB
Swift
Executable File
//
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// DownloadProgress.swift
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// RSWeb
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//
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// Created by Brent Simmons on 9/17/16.
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// Copyright © 2016 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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// Main thread only.
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public extension Notification.Name {
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static let DownloadProgressDidChange = Notification.Name(rawValue: "DownloadProgressDidChange")
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}
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public final class DownloadProgress {
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public var numberOfTasks = 0 {
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didSet {
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if numberOfTasks == 0 && numberRemaining != 0 {
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numberRemaining = 0
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}
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if numberOfTasks != oldValue {
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postDidChangeNotification()
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}
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}
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}
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public var numberRemaining = 0 {
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didSet {
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if numberRemaining == 0 && numberOfTasks != 0 {
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numberOfTasks = 0
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}
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if numberRemaining != oldValue {
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postDidChangeNotification()
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}
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}
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}
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public var numberCompleted: Int {
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var n = numberOfTasks - numberRemaining
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if n < 0 {
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n = 0
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}
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if n > numberOfTasks {
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n = numberOfTasks
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}
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return n
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}
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public var isComplete: Bool {
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assert(Thread.isMainThread)
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return numberRemaining < 1
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}
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public init(numberOfTasks: Int) {
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assert(Thread.isMainThread)
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self.numberOfTasks = numberOfTasks
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}
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public func addToNumberOfTasks(_ n: Int) {
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assert(Thread.isMainThread)
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numberOfTasks = numberOfTasks + n
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}
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public func addToNumberOfTasksAndRemaining(_ n: Int) {
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assert(Thread.isMainThread)
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numberOfTasks = numberOfTasks + n
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numberRemaining = numberRemaining + n
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}
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public func completeTask() {
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assert(Thread.isMainThread)
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if numberRemaining > 0 {
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numberRemaining = numberRemaining - 1
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}
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}
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public func completeTasks(_ tasks: Int) {
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assert(Thread.isMainThread)
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if numberRemaining >= tasks {
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numberRemaining = numberRemaining - tasks
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}
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}
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public func clear() {
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assert(Thread.isMainThread)
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numberOfTasks = 0
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}
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}
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// MARK: - Private
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private extension DownloadProgress {
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func postDidChangeNotification() {
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DispatchQueue.main.async {
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NotificationCenter.default.post(name: .DownloadProgressDidChange, object: self)
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}
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}
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}
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