84 lines
2.2 KiB
Swift
84 lines
2.2 KiB
Swift
// Copyright 2020-2021 Tokamak contributors
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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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// Created by Carson Katri on 7/7/20.
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//
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import OpenCombineShim
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@propertyWrapper
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public struct EnvironmentObject<ObjectType>: DynamicProperty
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where ObjectType: ObservableObject
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{
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@dynamicMemberLookup
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public struct Wrapper {
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internal let root: ObjectType
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public subscript<Subject>(
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dynamicMember keyPath: ReferenceWritableKeyPath<ObjectType, Subject>
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) -> Binding<Subject> {
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.init(
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get: {
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self.root[keyPath: keyPath]
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}, set: {
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self.root[keyPath: keyPath] = $0
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}
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)
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}
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}
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var _store: ObjectType?
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var _seed: Int = 0
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public mutating func _setContent(from values: EnvironmentValues) {
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_store = values[ObjectIdentifier(ObjectType.self)]
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}
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public var wrappedValue: ObjectType {
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guard let store = _store else { error() }
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return store
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}
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public var projectedValue: Wrapper {
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guard let store = _store else { error() }
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return Wrapper(root: store)
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}
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var objectWillChange: AnyPublisher<(), Never> {
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wrappedValue.objectWillChange.map { _ in }.eraseToAnyPublisher()
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}
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func error() -> Never {
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fatalError("No ObservableObject found for type \(ObjectType.self)")
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}
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public init() {}
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}
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extension EnvironmentObject: ObservedProperty {}
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@_spi(TokamakCore)
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extension EnvironmentObject: _EnvironmentReader {}
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extension ObservableObject {
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static var environmentStore: WritableKeyPath<EnvironmentValues, Self?> {
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\.[ObjectIdentifier(self)]
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}
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}
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public extension View {
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func environmentObject<B>(_ bindable: B) -> some View where B: ObservableObject {
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environment(B.environmentStore, bindable)
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}
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}
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