65 lines
2.1 KiB
Swift
65 lines
2.1 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 7/7/21.
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//
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/// A `ShapeStyle` that provides the `primary`, `secondary`, `tertiary`, and `quaternary` styles.
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@frozen
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public struct HierarchicalShapeStyle: ShapeStyle {
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@usableFromInline
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internal var id: UInt32
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@inlinable
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internal init(id: UInt32) {
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self.id = id
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}
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public func _apply(to shape: inout _ShapeStyle_Shape) {
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if let foregroundStyle = shape.environment._foregroundStyle,
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foregroundStyle.stylesArray.count > id
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{
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let style = foregroundStyle.stylesArray[Int(id)]
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if (style as? Self)?.id == id {
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shape.inRecursiveStyle = true
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// Walk up.
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shape.environment = foregroundStyle.environment
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}
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style._apply(to: &shape)
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} else {
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// Fallback to changing the opacity of the `foregroundColor`.
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shape.result = .color(
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(shape.environment.foregroundColor ?? .primary)
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.opacity({
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switch id {
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case 0: return 1
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case 1: return 0.5
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case 2: return 0.3
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default: return 0.2
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}
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}())
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)
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}
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}
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public static func _apply(to type: inout _ShapeStyle_ShapeType) {}
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}
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public extension ShapeStyle where Self == HierarchicalShapeStyle {
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static var primary: HierarchicalShapeStyle { .init(id: 0) }
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static var secondary: HierarchicalShapeStyle { .init(id: 1) }
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static var tertiary: HierarchicalShapeStyle { .init(id: 2) }
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static var quaternary: HierarchicalShapeStyle { .init(id: 3) }
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}
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