Update Animatable Data

Sources/OpenSwiftUICore/Animation/AnimatableArray.swift

@@ -0,0 +1,68 @@
+//
+//  AnimatableArray.swift
+//  OpenSwiftUICore
+//
+//  Audited for iOS 18.0
+//  Status: Complete
+
+package struct AnimatableArray<Element>: VectorArithmetic where Element: VectorArithmetic {
+    package var elements: [Element]
+
+    package init(_ elements: [Element]) {
+        self.elements = elements
+    }
+
+    package static var zero: AnimatableArray<Element> { .init([]) }
+
+    package static func += (lhs: inout AnimatableArray<Element>, rhs: AnimatableArray<Element>) {
+        let count = Swift.min(lhs.elements.count, rhs.elements.count)
+        for i in 0..<count {
+            lhs.elements[i] += rhs.elements[i]
+        }
+    }
+
+    package static func -= (lhs: inout AnimatableArray<Element>, rhs: AnimatableArray<Element>) {
+        let count = Swift.min(lhs.elements.count, rhs.elements.count)
+        for i in 0..<count {
+            lhs.elements[i] -= rhs.elements[i]
+        }
+    }
+
+    @_transparent
+    package static func + (lhs: AnimatableArray<Element>, rhs: AnimatableArray<Element>) -> AnimatableArray<Element> {
+        var result = lhs
+        result += rhs
+        return result
+    }
+
+    @_transparent
+    package static func - (lhs: AnimatableArray<Element>, rhs: AnimatableArray<Element>) -> AnimatableArray<Element> {
+        var result = lhs
+        result -= rhs
+        return result
+    }
+
+    package mutating func scale(by rhs: Double) {
+        for i in elements.indices {
+            elements[i].scale(by: rhs)
+        }
+    }
+
+    package var magnitudeSquared: Double {
+        elements.reduce(0) { partialResult, element in
+            partialResult + element.magnitudeSquared
+        }
+    }
+}
+
+extension Array where Element: Animatable {
+    package var animatableData: AnimatableArray<Element.AnimatableData> {
+        get { AnimatableArray(map(\.animatableData)) }
+        set {
+            let count = Swift.min(count, newValue.elements.count)
+            for i in 0..<count {
+                self[i].animatableData = newValue.elements[i]
+            }
+        }
+    }
+}

Sources/OpenSwiftUICore/Animation/AnimatablePair.swift

@@ -1,32 +1,35 @@
 //
 //  AnimatablePair.swift
-//  OpenSwiftUI
+//  OpenSwiftUICore
 //
-//  Audited for iOS 15.5
+//  Audited for iOS 18.0
 //  Status: Complete
 
 /// A pair of animatable values, which is itself animatable.
 @frozen
 public struct AnimatablePair<First, Second>: VectorArithmetic where First: VectorArithmetic, Second: VectorArithmetic {
+    /// The first value.
     public var first: First
+
+    /// The second value.
     public var second: Second
-
+
+    /// Creates an animated pair with the provided values.
     @inlinable
     public init(_ first: First, _ second: Second) {
         self.first = first
         self.second = second
     }
 
     @inlinable
-    subscript() -> (First, Second) {
+    package subscript() -> (First, Second) {
         get { (first, second) }
         set { (first, second) = newValue }
     }
 
     @_transparent
     public static var zero: AnimatablePair<First, Second> {
-        @_transparent
-        get { .init(First.zero, Second.zero) }
+        .init(First.zero, Second.zero)
     }
 
     @_transparent
@@ -57,13 +60,11 @@ public struct AnimatablePair<First, Second>: VectorArithmetic where First: Vecto
         second.scale(by: rhs)
     }
 
+    /// The dot-product of this animated pair with itself.
     @_transparent
     public var magnitudeSquared: Double {
-        @_transparent
-        get { first.magnitudeSquared + second.magnitudeSquared }
-    }
-
-    public static func == (a: AnimatablePair<First, Second>, b: AnimatablePair<First, Second>) -> Bool {
-        a.first == b.first && a.second == b.second
+        first.magnitudeSquared + second.magnitudeSquared
     }
 }
+
+extension AnimatablePair: Sendable where First: Sendable, Second: Sendable {}

Sources/OpenSwiftUICore/Animation/AnyAnimatableData.swift

@@ -0,0 +1,142 @@
+//
+//  AnyAnimatableData.swift
+//  OpenSwiftUICore
+//
+//  Audited for iOS 18.0
+//  Status: Complete
+//  ID: 7ABB4C511D8E2C0F1768F58E8C14509E (SwiftUICore)
+
+@frozen
+public struct _AnyAnimatableData: VectorArithmetic {
+    package var vtable: _AnyAnimatableDataVTable.Type
+    package var value: Any
+
+    @inline(__always)
+    init(vtable: _AnyAnimatableDataVTable.Type, value: Any) {
+        self.vtable = vtable
+        self.value = value
+    }
+
+    package init<T>(_ container: T) where T: Animatable {
+        vtable = VTable<T>.self
+        value = container.animatableData
+    }
+
+    package func update<T>(_ container: inout T) where T: Animatable {
+        guard vtable == VTable<T>.self else { return }
+        container.animatableData = value as! T.AnimatableData
+    }
+
+    public static var zero: _AnyAnimatableData {
+        _AnyAnimatableData(vtable: ZeroVTable.self, value: ZeroVTable.zero)
+    }
+
+    public static func == (lhs: _AnyAnimatableData, rhs: _AnyAnimatableData) -> Bool {
+        if lhs.vtable == rhs.vtable {
+            lhs.vtable.isEqual(lhs.value, rhs.value)
+        } else {
+            false
+        }
+    }
+
+    public static func += (lhs: inout _AnyAnimatableData, rhs: _AnyAnimatableData) {
+        if lhs.vtable == rhs.vtable {
+            lhs.vtable.add(&lhs.value, rhs.value)
+        } else if lhs.vtable == ZeroVTable.self {
+            lhs = rhs
+        }
+    }
+
+    public static func -= (lhs: inout _AnyAnimatableData, rhs: _AnyAnimatableData) {
+        if lhs.vtable == rhs.vtable {
+            lhs.vtable.subtract(&lhs.value, rhs.value)
+        } else if lhs.vtable == ZeroVTable.self {
+            lhs = rhs
+            lhs.vtable.negate(&lhs.value)
+        }
+    }
+
+    @_transparent
+    public static func + (lhs: _AnyAnimatableData, rhs: _AnyAnimatableData) -> _AnyAnimatableData {
+        var ret = lhs
+        ret += rhs
+        return ret
+    }
+
+    @_transparent
+    public static func - (lhs: _AnyAnimatableData, rhs: _AnyAnimatableData) -> _AnyAnimatableData {
+        var ret = lhs
+        ret -= rhs
+        return ret
+    }
+
+    public mutating func scale(by rhs: Double) {
+        vtable.scale(&value, by: rhs)
+    }
+
+    public var magnitudeSquared: Double {
+        vtable.magnitudeSquared(value)
+    }
+}
+
+@available(*, unavailable)
+extension _AnyAnimatableData: Sendable {}
+
+@usableFromInline
+package class _AnyAnimatableDataVTable {
+    package class var zero: Any {
+        preconditionFailure("")
+    }
+
+    package class func isEqual(_ lhs: Any, _ rhs: Any) -> Bool { false }
+    package class func add(_ lhs: inout Any, _ rhs: Any) {}
+    package class func subtract(_ lhs: inout Any, _ rhs: Any) {}
+    package class func negate(_ lhs: inout Any) {}
+    package class func scale(_ lhs: inout Any, by rhs: Double) {}
+    package class func magnitudeSquared(_ lhs: Any) -> Double { .zero }
+}
+
+@available(*, unavailable)
+extension _AnyAnimatableDataVTable: Sendable {}
+
+private final class VTable<Value>: _AnyAnimatableDataVTable where Value: Animatable {
+    override class var zero: Any {
+        Value.AnimatableData.zero
+    }
+
+    override class func isEqual(_ lhs: Any, _ rhs: Any) -> Bool {
+        lhs as! Value.AnimatableData == rhs as! Value.AnimatableData
+    }
+
+    override class func add(_ lhs: inout Any, _ rhs: Any) {
+        var value = lhs as! Value.AnimatableData
+        value += rhs as! Value.AnimatableData
+        lhs = value
+    }
+
+    override class func subtract(_ lhs: inout Any, _ rhs: Any) {
+        var value = lhs as! Value.AnimatableData
+        value -= rhs as! Value.AnimatableData
+        lhs = value
+    }
+
+    override class func negate(_ lhs: inout Any) {
+        var value = lhs as! Value.AnimatableData
+        value = .zero - value
+        lhs = value
+    }
+
+    override class func scale(_ lhs: inout Any, by rhs: Double) {
+        var value = lhs as! Value.AnimatableData
+        value.scale(by: rhs)
+        lhs = value
+    }
+
+    override class func magnitudeSquared(_ lhs: Any) -> Double {
+        (lhs as! Value.AnimatableData).magnitudeSquared
+    }
+}
+
+private final class ZeroVTable: _AnyAnimatableDataVTable {
+    override class var zero: Any { () }
+}

Sources/OpenSwiftUICore/Animation/EmptyAnimatableData.swift

@@ -1,10 +1,14 @@
 //
 //  EmptyAnimatableData.swift
-//  OpenSwiftUI
+//  OpenSwiftUICore
 //
-//  Audited for iOS 15.5
+//  Audited for iOS 18.0
 //  Status: Complete
 
+/// An empty type for animatable data.
+///
+/// This type is suitable for use as the `animatableData` property of
+/// types that do not have any animatable properties.
 @frozen
 public struct EmptyAnimatableData: VectorArithmetic {
     @inlinable
@@ -33,3 +37,13 @@ public struct EmptyAnimatableData: VectorArithmetic {
 
     public static func == (_: EmptyAnimatableData, _: EmptyAnimatableData) -> Bool { true }
 }
+
+public import Foundation
+
+extension Double: Animatable {
+    public typealias AnimatableData = Swift.Double
+}
+
+extension CGFloat: Animatable {
+    public typealias AnimatableData = CGFloat
+}