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//
// UserInterfaceInteractionRestriction.swift
// MullvadVPN
//
// Created by pronebird on 20/03/2020.
// Copyright © 2020 Mullvad VPN AB. All rights reserved.
//
import Foundation
/// A protocol describing a common interface for the implementations of user interaction restriction
protocol UserInterfaceInteractionRestrictionProtocol {
/// Increase the user interface interaction restrictions
func increase(animated: Bool)
/// Decrease the user interface interaction restrictions
func decrease(animated: Bool)
}
/// A counter based user interface interaction restriction implementation
class UserInterfaceInteractionRestriction: UserInterfaceInteractionRestrictionProtocol
{
typealias Action = (_ enableUserInteraction: Bool, _ animated: Bool) -> Void
private let action: Action
private var counter: UInt = 0
init(action: @escaping Action) {
self.action = action
}
func increase(animated: Bool) {
DispatchQueue.main.async {
if self.counter == 0 {
self.action(false, animated)
}
self.counter += 1
}
}
func decrease(animated: Bool) {
DispatchQueue.main.async {
guard self.counter > 0 else { return }
self.counter -= 1
if self.counter == 0 {
self.action(true, animated)
}
}
}
}
/// A user interface restriction implementation that simply combines multiple child restrictions
/// into one and automatically forwards all calls to them in the order in which they are given to
/// the initializer.
class CompoundUserInterfaceInteractionRestriction: UserInterfaceInteractionRestrictionProtocol {
private let restrictions: [UserInterfaceInteractionRestrictionProtocol]
init(restrictions: [UserInterfaceInteractionRestrictionProtocol]) {
self.restrictions = restrictions
}
func decrease(animated: Bool) {
restrictions.forEach { $0.decrease(animated: animated) }
}
func increase(animated: Bool) {
restrictions.forEach { $0.increase(animated: animated) }
}
}
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