57 lines
1.6 KiB
Swift
57 lines
1.6 KiB
Swift
//
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// Swiftfin is subject to the terms of the Mozilla Public
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// License, v2.0. If a copy of the MPL was not distributed with this
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// file, you can obtain one at https://mozilla.org/MPL/2.0/.
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//
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// Copyright (c) 2025 Jellyfin & Jellyfin Contributors
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//
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import Combine
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import Foundation
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/// Observable object property wrapper that allows observing
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/// another `Publisher`.
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@propertyWrapper
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final class ObservedPublisher<Value>: ObservableObject {
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@Published
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private(set) var wrappedValue: Value
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var projectedValue: AnyPublisher<Value, Never> {
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$wrappedValue
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.eraseToAnyPublisher()
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}
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private var cancellables = Set<AnyCancellable>()
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init<P: Publisher>(
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wrappedValue: Value,
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observing publisher: P
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) where P.Output == Value, P.Failure == Never {
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self.wrappedValue = wrappedValue
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publisher
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.receive(on: DispatchQueue.main)
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.sink { [weak self] newValue in
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self?.wrappedValue = newValue
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}
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.store(in: &cancellables)
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}
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static subscript<T: ObservableObject>(
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_enclosingInstance instance: T,
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wrapped wrappedKeyPath: KeyPath<T, Value>,
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storage storageKeyPath: KeyPath<T, ObservedPublisher<Value>>
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) -> Value where T.ObjectWillChangePublisher == ObservableObjectPublisher {
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let wrapper = instance[keyPath: storageKeyPath]
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wrapper.objectWillChange
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.sink { [weak instance] _ in
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instance?.objectWillChange.send()
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}
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.store(in: &wrapper.cancellables)
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return wrapper.wrappedValue
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}
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}
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