53 lines
1.6 KiB
Swift
53 lines
1.6 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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//
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// Created by Carson Katri on 11/26/20.
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//
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public struct _PreferenceWritingModifier<Key>: _PreferenceWritingModifierProtocol
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where Key: PreferenceKey
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{
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public let value: Key.Value
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public init(key: Key.Type = Key.self, value: Key.Value) {
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self.value = value
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}
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public func body(_ content: Content, with preferenceStore: inout _PreferenceStore) -> AnyView {
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preferenceStore.insert(value, forKey: Key.self)
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return content.view
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}
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public static func _makeView(_ inputs: ViewInputs<Self>) -> ViewOutputs {
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.init(
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inputs: inputs,
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preferenceStore: inputs.preferenceStore ?? .init(),
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preferenceAction: { $0.insert(inputs.content.value, forKey: Key.self) }
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)
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}
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}
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extension _PreferenceWritingModifier: Equatable where Key.Value: Equatable {
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public static func == (a: Self, b: Self) -> Bool {
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a.value == b.value
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}
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}
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public extension View {
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func preference<K>(key: K.Type = K.self, value: K.Value) -> some View
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where K: PreferenceKey
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{
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modifier(_PreferenceWritingModifier<K>(value: value))
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}
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}
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