passepartout-apple/Passepartout/App/Reusable/StyledPicker.swift

//
//  StyledPicker.swift
//  Passepartout
//
//  Created by Davide De Rosa on 2/19/22.
//  Copyright (c) 2022 Davide De Rosa. All rights reserved.
//
//  https://github.com/passepartoutvpn
//
//  This file is part of Passepartout.
//
//  Passepartout is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  Passepartout is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with Passepartout.  If not, see <http://www.gnu.org/licenses/>.
//

import SwiftUI

struct StyledPicker<T: Hashable, Label: View, Style: ListStyle>: View {
    let title: String
    
    @Binding var selection: T
    
    let values: [T]

    let pickerLabel: (T) -> Label

    let selectionLabel: (T) -> Label
    
    let listStyle: () -> Style

    @State private var isPresented = false

    var body: some View {
        NavigationLink(isActive: $isPresented, destination: pickerView) {
            HStack {
                Text(title)
                Spacer()
                selectionLabel(selection)
            }
        }
    }
    
    private func pickerView() -> some View {
        List {
            Section {
                ForEach(values, id: \.self) { value in
                    Button {
                        selection = value
                        isPresented = false
                    } label: {
                        HStack {
                            pickerLabel(value)
                            Spacer()
                            if value == selection {
                                Image(systemName: "checkmark")
                            }
                        }
                    }
                }
            }
        }.navigationTitle(title)
        .listStyle(listStyle())
    }
}