ba810116a0
It will automatically paginate to fill the screen and update the list as updates come in.
76 lines
2.7 KiB
Swift
76 lines
2.7 KiB
Swift
//
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// Copyright 2025 Element Creations Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
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// Please see LICENSE files in the repository root for full details.
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//
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import Combine
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import SwiftUI
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typealias RoomThreadListScreenViewModelType = StateStoreViewModelV2<RoomThreadListScreenViewState, RoomThreadListScreenViewAction>
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class RoomThreadListScreenViewModel: RoomThreadListScreenViewModelType, RoomThreadListScreenViewModelProtocol {
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private let threadListServiceProxy: RoomThreadListServiceProxyProtocol
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private var isOldestItemVisible = false
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private let actionsSubject: PassthroughSubject<RoomThreadListScreenViewModelAction, Never> = .init()
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var actionsPublisher: AnyPublisher<RoomThreadListScreenViewModelAction, Never> {
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actionsSubject.eraseToAnyPublisher()
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}
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init(threadListServiceProxy: RoomThreadListServiceProxyProtocol, mediaProvider: MediaProviderProtocol) {
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self.threadListServiceProxy = threadListServiceProxy
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super.init(initialViewState: .init(bindings: .init()), mediaProvider: mediaProvider)
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updateItems(self.threadListServiceProxy.itemsPublisher.value)
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threadListServiceProxy.itemsPublisher
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.receive(on: DispatchQueue.main)
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.sink { [weak self] items in
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self?.updateItems(items)
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}
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.store(in: &cancellables)
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threadListServiceProxy.paginationStatePublisher
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.receive(on: DispatchQueue.main)
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.sink { [weak self] paginationState in
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guard let self else { return }
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state.isPaginating = paginationState == .loading
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Task { await self.paginateIfNecessary(paginationState: paginationState) }
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}
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.store(in: &cancellables)
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}
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// MARK: - Public
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override func process(viewAction: RoomThreadListScreenViewAction) {
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MXLog.info("View model: received view action: \(viewAction)")
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switch viewAction {
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case .oldestItemDidAppear:
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isOldestItemVisible = true
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Task {
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await paginateIfNecessary(paginationState: threadListServiceProxy.paginationStatePublisher.value)
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}
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case .oldestItemDidDisappear:
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isOldestItemVisible = false
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}
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}
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// MARK: - Private
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private func paginateIfNecessary(paginationState: RoomThreadListPaginationState) async {
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if isOldestItemVisible, case .idle(endReached: false) = paginationState {
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_ = await threadListServiceProxy.paginate()
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}
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}
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private func updateItems(_ items: [RoomThreadListItem]) {
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state.items = items
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}
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}
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