57 lines
2.1 KiB
Swift
57 lines
2.1 KiB
Swift
// Copyright © 2020 Metabolist. All rights reserved.
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import Foundation
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import Combine
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class StatusesViewModel: ObservableObject {
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@Published private(set) var statusSections = [[Status]]()
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@Published var alertItem: AlertItem?
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@Published private(set) var loading = false
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let scrollToStatusID: AnyPublisher<String, Never>
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private let statusListService: StatusListService
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private let scrollToStatusIDInput = PassthroughSubject<String, Never>()
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private var hasScrolledToParentAfterContextLoad = false
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private var cancellables = Set<AnyCancellable>()
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init(statusListService: StatusListService) {
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self.statusListService = statusListService
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scrollToStatusID = scrollToStatusIDInput.eraseToAnyPublisher()
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statusListService.statusSections
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.assignErrorsToAlertItem(to: \.alertItem, on: self)
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.assign(to: &$statusSections)
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$statusSections
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.sink { [weak self] in
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guard let self = self else { return }
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if
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let contextParent = self.contextParent,
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!($0.first ?? []).isEmpty || !(($0.last ?? []).isEmpty),
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!self.hasScrolledToParentAfterContextLoad {
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self.hasScrolledToParentAfterContextLoad = true
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self.scrollToStatusIDInput.send(contextParent.id)
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}
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}
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.store(in: &cancellables)
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}
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}
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extension StatusesViewModel {
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var contextParent: Status? { statusListService.contextParent }
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func request(maxID: String? = nil, minID: String? = nil) {
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statusListService.request(maxID: maxID, minID: minID)
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.assignErrorsToAlertItem(to: \.alertItem, on: self)
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.handleEvents(
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receiveSubscription: { [weak self] _ in self?.loading = true },
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receiveCompletion: { [weak self] _ in self?.loading = false })
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.sink {}
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.store(in: &cancellables)
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}
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func contextViewModel(status: Status) -> StatusesViewModel {
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StatusesViewModel(statusListService: statusListService.contextService(status: status))
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}
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}
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