77 lines
1.8 KiB
Swift
77 lines
1.8 KiB
Swift
// Copyright 2022 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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import Foundation
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protocol AnyShapeBox {
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var animatableDataBox: _AnyAnimatableData { get set }
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func path(in rect: CGRect) -> Path
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func sizeThatFits(_ proposal: ProposedViewSize) -> CGSize
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}
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private struct ConcreteAnyShapeBox<Base: Shape>: AnyShapeBox {
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var base: Base
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var animatableDataBox: _AnyAnimatableData {
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get {
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_AnyAnimatableData(base.animatableData)
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}
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set {
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guard let newData = newValue.value as? Base.AnimatableData else {
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// TODO: Should this crash?
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return
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}
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base.animatableData = newData
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}
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}
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func path(in rect: CGRect) -> Path {
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base.path(in: rect)
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}
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func sizeThatFits(_ proposal: ProposedViewSize) -> CGSize {
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base.sizeThatFits(proposal)
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}
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}
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public struct AnyShape: Shape {
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var box: AnyShapeBox
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private init(_ box: AnyShapeBox) {
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self.box = box
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}
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}
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public extension AnyShape {
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init<S: Shape>(_ shape: S) {
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box = ConcreteAnyShapeBox(base: shape)
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}
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func path(in rect: CGRect) -> Path {
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box.path(in: rect)
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}
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func sizeThatFits(_ proposal: ProposedViewSize) -> CGSize {
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box.sizeThatFits(proposal)
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}
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var animatableData: _AnyAnimatableData {
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get { box.animatableDataBox }
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set { box.animatableDataBox = newValue }
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}
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}
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