114 lines
3.0 KiB
Swift
114 lines
3.0 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 7/6/21.
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//
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import Foundation
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public struct ContainerRelativeShape: Shape {
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var containerShape: (CGRect, GeometryProxy) -> Path? = { _, _ in nil }
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public func path(in rect: CGRect) -> Path {
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containerShape(rect, GeometryProxy(size: rect.size)) ?? Rectangle().path(in: rect)
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}
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public init() {}
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public mutating func _setContent(from values: EnvironmentValues) {
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containerShape = values._containerShape
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}
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}
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@_spi(TokamakCore)
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extension ContainerRelativeShape: _EnvironmentReader {}
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extension ContainerRelativeShape: InsettableShape {
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@inlinable
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public func inset(by amount: CGFloat) -> some InsettableShape {
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_Inset(amount: amount)
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}
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@usableFromInline
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@frozen
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internal struct _Inset: InsettableShape, DynamicProperty {
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@usableFromInline
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internal var amount: CGFloat
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@inlinable
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internal init(amount: CGFloat) {
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self.amount = amount
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}
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@usableFromInline
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internal func path(in rect: CGRect) -> Path {
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// FIXME: Inset the container shape.
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Rectangle().path(in: rect)
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}
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@inlinable
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internal func inset(by amount: CGFloat) -> ContainerRelativeShape._Inset {
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var copy = self
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copy.amount += amount
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return copy
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}
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}
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}
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private extension EnvironmentValues {
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enum ContainerShapeKey: EnvironmentKey {
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static let defaultValue: (CGRect, GeometryProxy) -> Path? = { _, _ in nil }
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}
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var _containerShape: (CGRect, GeometryProxy) -> Path? {
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get {
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self[ContainerShapeKey.self]
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}
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set {
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self[ContainerShapeKey.self] = newValue
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}
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}
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}
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@frozen
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public struct _ContainerShapeModifier<Shape>: ViewModifier where Shape: InsettableShape {
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public var shape: Shape
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@inlinable
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public init(shape: Shape) { self.shape = shape }
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public func body(content: Content) -> some View {
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_ContainerShapeView(content: content, shape: shape)
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}
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public struct _ContainerShapeView: View {
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public let content: Content
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public let shape: Shape
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public var body: some View {
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content
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.environment(\._containerShape) { rect, proxy in
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shape
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.inset(by: proxy.size.width) // TODO: Calculate the offset using content's geometry
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.path(in: rect)
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}
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}
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}
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}
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public extension View {
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@inlinable
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func containerShape<T>(_ shape: T) -> some View where T: InsettableShape {
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modifier(_ContainerShapeModifier(shape: shape))
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}
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}
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