80 lines
1.9 KiB
Swift
80 lines
1.9 KiB
Swift
// Copyright 2020 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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import CombineShim
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public final class EnvironmentValues: CustomStringConvertible {
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public var description: String {
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"EnvironmentValues: \(values.count)"
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}
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private var values: [ObjectIdentifier: Any] = [:]
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public init() {}
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public subscript<K>(key: K.Type) -> K.Value where K: EnvironmentKey {
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get {
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if let val = values[ObjectIdentifier(key)] as? K.Value {
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return val
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}
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return K.defaultValue
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}
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set {
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values[ObjectIdentifier(key)] = newValue
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}
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}
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subscript<B>(bindable: ObjectIdentifier) -> B? where B: ObservableObject {
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get {
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values[bindable] as? B
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}
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set {
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values[bindable] = newValue
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}
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}
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}
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struct IsEnabledKey: EnvironmentKey {
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static let defaultValue = true
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}
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public extension EnvironmentValues {
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var isEnabled: Bool {
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get {
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self[IsEnabledKey.self]
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}
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set {
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self[IsEnabledKey.self] = newValue
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}
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}
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}
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struct _EnvironmentValuesWritingModifier: ViewModifier, EnvironmentModifier {
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let environmentValues: EnvironmentValues
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func body(content: Content) -> some View {
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content
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}
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func modifyEnvironment(_ values: EnvironmentValues) {
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// values = environmentValues
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}
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}
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public extension View {
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func environmentValues(_ values: EnvironmentValues) -> some View {
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modifier(_EnvironmentValuesWritingModifier(environmentValues: values))
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}
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}
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