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//
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// RouteComposer
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// SingleNavigationRouter.swift
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// https://github.com/ekazaev/route-composer
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//
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// Created by Eugene Kazaev in 2018-2022.
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// Distributed under the MIT license.
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//
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// Become a sponsor:
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// https://github.com/sponsors/ekazaev
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//
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import Foundation
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import UIKit
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/// Lock object to be shared between `SingleNavigationRouter` instances.
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public final class SingleNavigationLock {
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private final var isNavigationInProgressFlag = false
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/// `SingleNavigationLock` state
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public final var isNavigationInProgress: Bool {
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isNavigationInProgressFlag
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}
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/// Constructor
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public init() {}
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final func startNavigation() {
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isNavigationInProgressFlag = true
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}
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final func stopNavigation() {
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isNavigationInProgressFlag = false
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}
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}
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/// The `Router` proxy guarantees that not more than one navigation will happen simultaneously.
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///
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/// It is useful to avoid situations when the application can not control the amount of navigations
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/// (for example, a navigation triggered by the push notifications)
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public struct SingleNavigationRouter<R>: Router where R: Router {
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// MARK: Properties
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var router: R
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/// Shared `SingleNavigationLock` instance
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public let lock: SingleNavigationLock
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// MARK: Methods
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/// Constructor
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///
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/// - Parameters:
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/// - router: `Router` instance to proxy.
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/// - lock: Shared `SingleNavigationLock` instance.
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public init(router: R, lock: SingleNavigationLock) {
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self.router = router
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self.lock = lock
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}
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public func navigate<Context>(to step: DestinationStep<some UIViewController, Context>,
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with context: Context,
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animated: Bool,
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completion: ((RoutingResult) -> Void)?) throws {
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guard !lock.isNavigationInProgress else {
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throw RoutingError.compositionFailed(.init("Navigation is in progress"))
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}
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lock.startNavigation()
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do {
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try router.navigate(to: step, with: context, animated: animated, completion: { success in
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self.lock.stopNavigation()
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completion?(success)
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})
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} catch {
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lock.stopNavigation()
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throw error
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}
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}
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}
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extension SingleNavigationRouter: InterceptableRouter where R: InterceptableRouter {
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public mutating func add<RI: RoutingInterceptor>(_ interceptor: RI) where RI.Context == Any? {
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router.add(interceptor)
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}
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public mutating func add<CT: ContextTask>(_ contextTask: CT) where CT.ViewController == UIViewController, CT.Context == Any? {
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router.add(contextTask)
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}
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public mutating func add<PT: PostRoutingTask>(_ postTask: PT) where PT.Context == Any? {
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router.add(postTask)
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}
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}
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