75 lines
3.1 KiB
Swift
75 lines
3.1 KiB
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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import Foundation
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import GRDB
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import DifferenceKit
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import SessionUIKit
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import SessionMessagingKit
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import SessionUtilitiesKit
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class NotificationContentViewModel: SessionTableViewModel<NoNav, NotificationSettingsViewModel.Section, Preferences.NotificationPreviewType> {
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private let storage: Storage
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private let scheduler: ValueObservationScheduler
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// MARK: - Initialization
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init(
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storage: Storage = Storage.shared,
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scheduling scheduler: ValueObservationScheduler = Storage.defaultPublisherScheduler
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) {
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self.storage = storage
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self.scheduler = scheduler
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}
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// MARK: - Section
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public enum Section: SessionTableSection {
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case content
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}
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// MARK: - Content
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override var title: String { "NOTIFICATIONS_STYLE_CONTENT_TITLE".localized() }
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public override var observableTableData: ObservableData { _observableTableData }
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/// This is all the data the screen needs to populate itself, please see the following link for tips to help optimise
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/// performance https://github.com/groue/GRDB.swift#valueobservation-performance
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///
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/// **Note:** This observation will be triggered twice immediately (and be de-duped by the `removeDuplicates`)
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/// this is due to the behaviour of `ValueConcurrentObserver.asyncStartObservation` which triggers it's own
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/// fetch (after the ones in `ValueConcurrentObserver.asyncStart`/`ValueConcurrentObserver.syncStart`)
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/// just in case the database has changed between the two reads - unfortunately it doesn't look like there is a way to prevent this
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private lazy var _observableTableData: ObservableData = ValueObservation
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.trackingConstantRegion { [storage] db -> [SectionModel] in
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let currentSelection: Preferences.NotificationPreviewType? = db[.preferencesNotificationPreviewType]
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.defaulting(to: .defaultPreviewType)
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return [
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SectionModel(
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model: .content,
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elements: Preferences.NotificationPreviewType.allCases
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.map { previewType in
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SessionCell.Info(
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id: previewType,
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title: previewType.name,
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rightAccessory: .radio(
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isSelected: { (currentSelection == previewType) }
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),
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onTap: { [weak self] in
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storage.writeAsync { db in
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db[.preferencesNotificationPreviewType] = previewType
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}
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self?.dismissScreen()
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}
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)
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}
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)
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]
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}
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.removeDuplicates()
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.publisher(in: storage, scheduling: scheduler)
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.mapToSessionTableViewData(for: self)
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}
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