47 lines
1.4 KiB
Swift
47 lines
1.4 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 7/20/20.
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//
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public protocol _SceneModifier {
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associatedtype Body: Scene
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typealias SceneContent = _SceneModifier_Content<Self>
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func body(content: SceneContent) -> Self.Body
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}
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public struct _SceneModifier_Content<Modifier>: Scene where Modifier: _SceneModifier {
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public let modifier: Modifier
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public let scene: _AnyScene
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@_spi(TokamakCore)
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public var body: Never {
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neverScene("_SceneModifier_Content")
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}
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}
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public extension Scene {
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func modifier<Modifier>(_ modifier: Modifier) -> ModifiedContent<Self, Modifier> {
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.init(content: self, modifier: modifier)
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}
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}
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public extension _SceneModifier where Body == Never {
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func body(content: SceneContent) -> Body {
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fatalError("""
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\(self) is a primitive `_SceneModifier`, you're not supposed to run `body(content:)`
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""")
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}
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}
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