87 lines
1.8 KiB
Swift
87 lines
1.8 KiB
Swift
//
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// RefreshTimer.swift
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// NetNewsWire
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//
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// Created by Maurice Parker on 4/23/19.
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// Copyright © 2019 Ranchero Software. All rights reserved.
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//
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import Foundation
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protocol RefreshTimerDelegate: class {
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func refresh()
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}
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class RefreshTimer {
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var shuttingDown = false
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private weak var delegate: RefreshTimerDelegate?
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private var internalTimer: Timer?
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private var lastTimedRefresh: Date?
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private let launchTime = Date()
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init(delegate: RefreshTimerDelegate) {
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self.delegate = delegate
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}
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func fireOldTimer() {
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if let timer = internalTimer {
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if timer.fireDate < Date() {
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if AppDefaults.refreshInterval != .manually {
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timedRefresh(nil)
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}
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}
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}
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}
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func invalidate() {
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guard let timer = internalTimer else {
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return
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}
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if timer.isValid {
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timer.invalidate()
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}
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internalTimer = nil
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}
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func update() {
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guard !shuttingDown else {
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return
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}
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let refreshInterval = AppDefaults.refreshInterval
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if refreshInterval == .manually {
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invalidate()
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return
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}
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let lastRefreshDate = lastTimedRefresh ?? launchTime
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let secondsToAdd = refreshInterval.inSeconds()
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var nextRefreshTime = lastRefreshDate.addingTimeInterval(secondsToAdd)
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if nextRefreshTime < Date() {
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nextRefreshTime = Date().addingTimeInterval(secondsToAdd)
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}
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if let currentNextFireDate = internalTimer?.fireDate, currentNextFireDate == nextRefreshTime {
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return
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}
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invalidate()
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let timer = Timer(fireAt: nextRefreshTime, interval: 0, target: self, selector: #selector(timedRefresh(_:)), userInfo: nil, repeats: false)
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RunLoop.main.add(timer, forMode: .common)
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internalTimer = timer
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print("Next refresh date: \(nextRefreshTime)")
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}
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@objc func timedRefresh(_ sender: Timer?) {
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guard !shuttingDown else {
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return
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}
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lastTimedRefresh = Date()
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update()
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delegate?.refresh()
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}
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}
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