bundesmessenger-ios/bwi/CommonUI/TableViewCellWithLabelSubLabelAndSwitch.swift

//
/*
 * Copyright (c) 2023 BWI GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import SwiftUI
import Foundation

/// model for swiftui cell
@objcMembers class BWIToggleWithLabelAndSubLabelCellData: NSObject, ObservableObject {
    @Published var toggleValue: Bool = false
    @Published var isToggleDisabled: Bool = false
    @Published var toggleText: String
    @Published var subText: String
    let initalToggleValue: Bool
    
    init(initalToggleValue: Bool, isToggleDisabled: Bool, toggleText: String, subText: String) {
        self.initalToggleValue = initalToggleValue
        self.toggleValue = initalToggleValue
        self.isToggleDisabled = isToggleDisabled
        self.toggleText = toggleText
        self.subText = subText
    }
}

/// Helper  class for making our SwiftUI view available to ObjectiveC
@objcMembers class TableViewCellWithLabelSubLabelAndSwitch: MXKTableViewCell {
    private var parentViewController: UIViewController?
    private var hostingController: UIHostingController<TableViewCellWithLabelSubLabelAndSwitchView>?
    private var cellToggleData: BWIToggleWithLabelAndSubLabelCellData?
    private var theme: Theme!
    
    public func makeViewController(parent: UIViewController, rootView: TableViewCellWithLabelSubLabelAndSwitchView) {
        hostingController = UIHostingController<TableViewCellWithLabelSubLabelAndSwitchView>(rootView: rootView)
        setupView(parent: parent)
    }
    
    // support for objective c vc
    func makeViewController(parent: UIViewController, toggleData: BWIToggleWithLabelAndSubLabelCellData, onValueChanged:((_ newValue: Bool)-> Void)?) {
        self.cellToggleData = toggleData
        if let cellToggleData = self.cellToggleData {
            hostingController = UIHostingController(rootView: TableViewCellWithLabelSubLabelAndSwitchView(toggleData: cellToggleData, onValueChanged: onValueChanged))
            setupView(parent: parent)
        }
    }
    
    override init!(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    private func setupView(parent: UIViewController) {
        self.parentViewController = parent
        
        if let hostingController = hostingController {
            let shouldControllerMove = hostingController.parent != parent
            if shouldControllerMove {
                removeController()
                parent.addChild(hostingController)
            }
            
            if !self.contentView.subviews.contains(hostingController.view) {
                self.contentView.addSubview(hostingController.view)
                self.contentView.vc_addSubViewMatchingParentSafeArea(hostingController.view)
            }
            
            if shouldControllerMove {
                hostingController.didMove(toParent: parent)
            }
            
            registerThemeServiceDidChangeThemeNotification()
            update(theme: ThemeService.shared().theme)
        }
    }
    
    private func registerThemeServiceDidChangeThemeNotification() {
        NotificationCenter.default.addObserver(self, selector: #selector(themeDidChange), name: .themeServiceDidChangeTheme, object: nil)
    }
    
    @objc private func themeDidChange() {
        update(theme: ThemeService.shared().theme)
    }
    
    private func update(theme: Theme) {
        self.theme = theme
        if let hostingController = hostingController {
            hostingController.view.backgroundColor = theme.headerBackgroundColor
        }
    }
        
    func hasBeenInitialized() -> Bool {
        return self.hostingController != nil
    }
    
    deinit {
        removeController()
    }
    
    private func removeController() {
        if let hostingController = hostingController {
            hostingController.willMove(toParent: nil)
            hostingController.view.removeFromSuperview()
            hostingController.removeFromParent()
            parentViewController = nil
        }
    }
}

struct TableViewCellWithLabelSubLabelAndSwitchView: View {
    @ObservedObject var toggleData: BWIToggleWithLabelAndSubLabelCellData
    @Environment(\.theme) private var theme
    var onValueChanged:((_ newValue: Bool)-> Void)?

    var body: some View {
        VStack(alignment: .leading) {
            HStack {
                Toggle(isOn: $toggleData.toggleValue) {
                    Text(toggleData.toggleText)
                        .lineLimit(nil)
                }
                    .onChange(of: toggleData.toggleValue) { newValue in
                        onValueChanged?(newValue)
                    }
                    .toggleStyle(SwitchToggleStyle(tint: Color(ThemeService.shared().theme.tintColor)))
                    .disabled(toggleData.isToggleDisabled)
            }
            Text(toggleData.subText)
                .font(.system(size: 15))
                .foregroundColor(theme.colors.secondaryContent)
                .lineLimit(nil)
        }
        .padding([.leading, .trailing], 16)
        .padding([.top, .bottom], 8)
    }
}