import SwiftUI

private struct SizePreferenceKey: PreferenceKey {
    static let defaultValue: CGSize = .zero
    static func reduce(value _: inout CGSize, nextValue _: () -> CGSize) {}
}

public extension View {
    func readSize(onChange: @Sendable @escaping (CGSize) -> Void) -> some View {
        background(
            GeometryReader { geometryProxy in
                Color.clear
                    .preference(key: SizePreferenceKey.self, value: geometryProxy.size)
            }
        )
        .onPreferenceChange(SizePreferenceKey.self, perform: onChange)
    }

    func readSize(to: Binding<CGSize>) -> some View {
        readSize { size in
            to.wrappedValue = size
        }
    }
}