139 lines
4.8 KiB
Swift
139 lines
4.8 KiB
Swift
//
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// AlertOperation.swift
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// MVMCoreUI
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//
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// Created by Scott Pfeil on 4/11/23.
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// Copyright © 2023 Verizon Wireless. All rights reserved.
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//
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import MVMCore
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import Dispatch
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import Combine
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public class AlertOperation: MVMCoreOperation {
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private actor Properties {
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private var isDisplayed: Bool = false
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func set(displayed: Bool) {
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isDisplayed = displayed
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}
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func getIsDisplayed() -> Bool {
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return isDisplayed
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}
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}
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private var properties = Properties()
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public let alertController: AlertController
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public let alertObject: AlertObject
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/// For tracking isVisible changes of the alert controller.
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private var cancellable: Cancellable?
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/// Blocks the navigation queue to ensure no other navigation happens while an alert is displayed.
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private var blockingOperation: MVMCoreOperation?
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public init(with alert: AlertController, alertObject: AlertObject) {
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self.alertController = alert
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self.alertObject = alertObject
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super.init()
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}
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deinit {
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stopObservingAlertView()
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}
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public override func main() {
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guard !checkAndHandleForCancellation() else { return }
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// Observe for when it is removed.
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observeForCurrentAlertViewDismissal()
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Task(priority: .high) {
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guard let viewControllerToPresentOn = await NavigationHandler.shared().getViewControllerToPresentOn() else {
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markAsFinished()
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return
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}
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// Presents the alert.
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let presentationOperation = await NavigationOperation(with: .present(viewController: alertController, onController: viewControllerToPresentOn), tryToReplace: false)
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let blockingOperation = MVMCoreOperation()
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blockingOperation.addDependency(presentationOperation)
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self.blockingOperation = blockingOperation
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// Block other navigation until this alert is removed.
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NavigationHandler.shared().navigationQueue.addOperation(blockingOperation)
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await NavigationHandler.shared().navigate(with: presentationOperation)
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// We finished but it was not displayed yet. It's possible that it was cancelled. Finish this task
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if await !self.properties.getIsDisplayed() {
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self.markAsFinished()
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} else {
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(MVMCoreObject.sharedInstance()?.loggingDelegate as? MVMCoreUILoggingDelegateProtocol)?.logAlert(with: self.alertObject)
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if self.isCancelled {
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await self.dismissAlertView()
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}
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}
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}
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}
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public override func cancel() {
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super.cancel()
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Task { @MainActor in
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self.alertObject.alertDelegate?.alertCancelled(self.alertController)
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await self.dismissAlertView()
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}
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}
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private func dismissAlertView() async {
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guard await properties.getIsDisplayed() else { return }
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await withCheckedContinuation { continuation in
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Task {
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let dismissOperation = await NavigationOperation(with: .dismiss(viewController: alertController))
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dismissOperation.queuePriority = .veryHigh
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let task = Task(priority: .high) { await NavigationHandler.shared().navigate(with: dismissOperation) }
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blockingOperation?.markAsFinished()
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_ = await task.result
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continuation.resume()
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}
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}
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}
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public override func markAsFinished() {
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blockingOperation?.markAsFinished()
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super.markAsFinished()
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}
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// MARK: Observer Functions
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private func observeForCurrentAlertViewDismissal() {
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stopObservingAlertView()
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cancellable = alertController.publisher(for: \AlertController.visible).sink() { [weak self] visible in
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guard let self = self else { return }
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Task {
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guard await self.properties.getIsDisplayed() != visible else { return }
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await self.properties.set(displayed: visible)
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Task { @MainActor in
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if visible {
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self.alertObject.alertDelegate?.alertShown(self.alertController)
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} else {
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self.alertObject.alertDelegate?.alertDismissed(self.alertController)
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// Is visible was set to NO, meaning that the alertview is no longer visible.
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self.stopObservingAlertView()
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self.markAsFinished()
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}
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}
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}
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}
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}
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private func stopObservingAlertView() {
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cancellable?.cancel()
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}
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}
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