88 lines
3.1 KiB
Swift
88 lines
3.1 KiB
Swift
//
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import SwiftUI
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@available(iOS 14, *)
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typealias RoomScreenViewModelType = StateStoreViewModel<RoomScreenViewState,
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Never,
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RoomScreenViewAction>
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@available(iOS 14, *)
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class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol {
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private struct Constants {
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static let backPaginationPageSize: UInt = 30
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}
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private let timelineController: RoomTimelineControllerProtocol
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private let timelineViewFactory: RoomTimelineViewFactory
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// MARK: - Setup
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init(timelineController: RoomTimelineControllerProtocol,
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timelineViewFactory: RoomTimelineViewFactory,
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roomName: String?) {
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self.timelineController = timelineController
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self.timelineViewFactory = timelineViewFactory
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super.init(initialViewState: RoomScreenViewState(roomTitle: roomName ?? "💥"))
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buildTimelineViews()
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timelineController.callbacks.sink { [weak self] callback in
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guard let self = self else { return }
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switch callback {
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case .updatedTimelineItems:
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self.buildTimelineViews()
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case .updatedTimelineItem(let itemId):
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guard let timelineItem = self.timelineController.timelineItems.first(where: { $0.id == itemId }),
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let viewIndex = self.state.items.firstIndex(where: { $0.id == itemId }) else {
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return
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}
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self.state.items[viewIndex] = timelineViewFactory.buildTimelineViewFor(timelineItem)
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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: RoomScreenViewAction) {
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switch viewAction {
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case .loadPreviousPage:
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state.isBackPaginating = true
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timelineController.paginateBackwards(Constants.backPaginationPageSize) { [weak self] _ in
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self?.state.isBackPaginating = false
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}
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case .itemAppeared(let id):
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timelineController.processItemAppearance(id)
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case .itemDisappeared(let id):
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timelineController.processItemDisappearance(id)
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case .linkClicked(let url):
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MXLog.warning("Link clicked: \(url)")
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}
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}
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// MARK: - Private
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private func buildTimelineViews() {
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state.items = timelineController.timelineItems.map { item in
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timelineViewFactory.buildTimelineViewFor(item)
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}
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}
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}
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