View.sheet(item:id:onDismiss:content)

View+Sheet.swift

//
// This source file is part of the Stanford Spezi open-source project
//
// SPDX-FileCopyrightText: 2025 Stanford University and the project authors (see CONTRIBUTORS.md)
//
// SPDX-License-Identifier: MIT
//

import Foundation
import SwiftUI


private struct IdentifiableAdaptor<Value, ID: Hashable>: Identifiable {
    let value: Value
    private let _id: (Value) -> ID
    
    var id: ID { _id(value) }
    
    init(value: Value, id: @escaping (Value) -> ID) {
        self.value = value
        self._id = id
    }
}

extension View {
    public func sheet<Item, ID: Hashable>(
        item: Binding<Item?>,
        id: @escaping (Item) -> ID,
        onDismiss: (@MainActor () -> Void)? = nil,
        @ViewBuilder content: @MainActor @escaping (Item) -> some View
    ) -> some View {
        let binding = Binding<IdentifiableAdaptor<Item, ID>?> {
            if let item = item.wrappedValue {
                IdentifiableAdaptor(value: item, id: id)
            } else {
                nil
            }
        } set: { newValue in
            if let newValue {
                item.wrappedValue = newValue.value
            } else {
                item.wrappedValue = nil
            }
        }
        return self.sheet(item: binding, onDismiss: onDismiss) { item in
            content(item.value)
        }
    }
}