68 lines
2.1 KiB
Swift
68 lines
2.1 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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protocol ModifierContainer {
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var environmentModifier: _EnvironmentModifier? { get }
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}
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protocol ModifiedContentProtocol {}
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/// A value with a modifier applied to it.
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public struct ModifiedContent<Content, Modifier>: ModifiedContentProtocol {
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@Environment(\.self)
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public var environment
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public typealias Body = Never
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public private(set) var content: Content
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public private(set) var modifier: Modifier
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public init(content: Content, modifier: Modifier) {
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self.content = content
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self.modifier = modifier
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}
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}
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extension ModifiedContent: ModifierContainer {
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var environmentModifier: _EnvironmentModifier? { modifier as? _EnvironmentModifier }
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}
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@_spi(TokamakCore)
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extension ModifiedContent: _EnvironmentReader where Modifier: _EnvironmentReader {
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public mutating func _setContent(from values: EnvironmentValues) {
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modifier._setContent(from: values)
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}
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}
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extension ModifiedContent: View, GroupView, ParentView where Content: View, Modifier: ViewModifier {
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public var body: Body {
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neverBody("ModifiedContent<View, ViewModifier>")
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}
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public var children: [AnyView] {
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[AnyView(content)]
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}
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}
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extension ModifiedContent: ViewModifier where Content: ViewModifier, Modifier: ViewModifier {
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public func body(content: _ViewModifier_Content<Self>) -> Never {
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neverBody("ModifiedContent<ViewModifier, ViewModifier>")
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}
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}
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public extension ViewModifier {
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func concat<T>(_ modifier: T) -> ModifiedContent<Self, T> where T: ViewModifier {
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.init(content: self, modifier: modifier)
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}
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}
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