A wrapper around onScrollPhaseChange that applies it only on visionOS 2 and is a no-op on visionOS 1

OnScrollPhaseChange_visionOS2.swift

//
//  OnScrollPhaseChange_visionOS2.swift
//
//  Created by Drew Olbrich on 7/23/24.
//  Copyright © 2024 Lunar Skydiving LLC. All rights reserved.
//
//  MIT License
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.
//

import Foundation
import SwiftUI

enum ScrollPhase_visionOS2: Equatable {
    case idle
    case tracking
    case interacting
    case decelerating
    case animating
    
    var isScrolling: Bool {
        return self != .idle
    }
}

extension View {
    
    /// A wrapper around `onScrollPhaseChange` that applies it only on visionOS 2 and
    /// later, and is a no-op on visionOS 1.
    ///
    /// This is necessary because there doesn't appear to be an easy way to
    /// conditionally apply SwiftUI view modifiers or scene modifiers for specific OS
    /// versions.
    func onScrollPhaseChange_visionOS2(_ action: @escaping (_ oldPhase: ScrollPhase_visionOS2, _ newPhase: ScrollPhase_visionOS2) -> Void) -> some View {
        if #available(visionOS 2.0, *) {
            func convertPhase(_ scrollPhase: ScrollPhase) -> ScrollPhase_visionOS2 {
                switch scrollPhase {
                case .idle:
                    return .idle
                case .tracking:
                    return .tracking
                case .interacting:
                    return .interacting
                case .decelerating:
                    return .decelerating
                case .animating:
                    return .animating
                }
            }
            return self.onScrollPhaseChange { (_ oldPhase: ScrollPhase, _ newPhase: ScrollPhase) -> Void in
                return action(convertPhase(oldPhase), convertPhase(newPhase))
            }
        } else {
            return self
        }
    }
    
}