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Notify user on low power situations (#19)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| // | ||
| // LowPowerCoordinator.swift | ||
| // Juice | ||
| // | ||
| // Created by Brian Michel on 1/2/17. | ||
| // Copyright © 2017 Brian Michel. All rights reserved. | ||
| // | ||
|
|
||
| import AppKit | ||
| import RxSwift | ||
|
|
||
| final class LowPowerCoordinator { | ||
| private enum Constants { | ||
| //TODO: Could probably make this a user preference | ||
| static let lowPowerNotificationPercentage = 10 | ||
| static let lowPowerNotificationIdentifier = "com.bsm.macos.juice.low-power-notification" | ||
| } | ||
| private let powerSourceObservable: Observable<[PowerSource]> | ||
| private let notificationCenter = NSUserNotificationCenter.default | ||
| private let disposeBag = DisposeBag() | ||
| private var lastPowerState: PowerSourceState = .unknown | ||
|
|
||
| private var notificationHasBeenDelivered: Bool { | ||
| return notificationCenter.deliveredNotifications.filter({ $0.identifier == Constants.lowPowerNotificationIdentifier }).count > 0 | ||
| } | ||
|
|
||
| init(observable: Observable<[PowerSource]>) { | ||
| powerSourceObservable = observable | ||
| } | ||
|
|
||
| func start() { | ||
| powerSourceObservable.shareReplay(1).subscribe { (event) in | ||
| switch event { | ||
| case .next(let sources): | ||
| guard let source = sources.first else { | ||
| return | ||
| } | ||
| self.checkForNotificationDismissal(powerSource: source) | ||
| self.checkForWarning(powerSource: source) | ||
| case .error(let error): | ||
| print("Error: \(error)") | ||
| case .completed: | ||
| break | ||
| } | ||
| }.addDisposableTo(disposeBag) | ||
| } | ||
|
|
||
| private func checkForNotificationDismissal(powerSource: PowerSource) { | ||
| if lastPowerState == .battery | ||
| && powerSource.state == .ac { | ||
| clearDeliveredNotification() | ||
| } | ||
|
|
||
| lastPowerState = powerSource.state | ||
| } | ||
|
|
||
| private func checkForWarning(powerSource: PowerSource) { | ||
| if powerSource.chargedPercentage <= Constants.lowPowerNotificationPercentage | ||
| && powerSource.state == .battery | ||
| && !notificationHasBeenDelivered { | ||
| let userNotification = NSUserNotification() | ||
| userNotification.title = NSLocalizedString("Low Power", comment: "Title of notification shown to user when their battery is very low.") | ||
| userNotification.informativeText = NSLocalizedString("Your Mac will sleep soon unless plugged into a power outlet.", comment: "Body of notification shown to user when their battery is very low.") | ||
| userNotification.hasActionButton = false | ||
| userNotification.identifier = Constants.lowPowerNotificationIdentifier | ||
|
|
||
| notificationCenter.deliver(userNotification) | ||
| } | ||
| } | ||
|
|
||
| private func clearDeliveredNotification() { | ||
| let userNotification = NSUserNotification() | ||
| userNotification.identifier = Constants.lowPowerNotificationIdentifier | ||
| notificationCenter.removeDeliveredNotification(userNotification) | ||
| } | ||
| } |
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