DP44/DataPRO/Modules/Menu/HamburgerMenu/ViewModel/HamburgerMenuViewModel.cs

using System.ComponentModel;
using System.ComponentModel.Composition;
using System.Threading.Tasks;
using DTS.Common.Events;
using DTS.Common.Interface.Menu.HamburgerMenu;
using Prism.Events;
using Prism.Regions;
using Unity;
using DTS.Common.Interactivity;
using System.Windows.Controls;
using HamburgerMenu.Model;
using System.Windows.Automation;
// ReSharper disable CheckNamespace
// ReSharper disable MemberCanBePrivate.Global
// ReSharper disable InconsistentNaming

namespace HamburgerMenu
{
    /// <summary>
    /// this class handles HardwareList functionality
    /// </summary>
    [PartCreationPolicy(CreationPolicy.Shared)]
    public class HamburgerMenuViewModel : IHamburgerMenuViewModel
    {
        public IHamburgerMenuView View { get; set; }

        private IEventAggregator _eventAggregator { get; }
        private IRegionManager _regionManager;
        private IUnityContainer UnityContainer { get; }

        public InteractionRequest<Notification> NotificationRequest { get; }
        public InteractionRequest<Confirmation> ConfirmationRequest { get; }

        /// <inheritdoc />
        /// <summary>
        /// Occurs when a property value changes.
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;
        public void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        #region constructors and initializers
        /// <summary>
        /// Creates a new instance of the HamburgerMenuViewModel
        /// </summary>
        /// <param name="view"></param>
        /// <param name="regionManager">The logical placeholder defined within the application's UI (in the shell or within views) into which views are displayed.</param>
        /// <param name="eventAggregator">The EventAggregator which allows different components to publish/subscribe to events without being coupled to each other.</param>
        /// <param name="unityContainer">The unityContainer.</param>
        public HamburgerMenuViewModel(IHamburgerMenuView view, IRegionManager regionManager,
            IEventAggregator eventAggregator, IUnityContainer unityContainer)
        {
            View = view;
            View.DataContext = this;

            NotificationRequest = new InteractionRequest<Notification>();
            ConfirmationRequest = new InteractionRequest<Confirmation>();

            _eventAggregator = eventAggregator;
            UnityContainer = unityContainer;
            _regionManager = regionManager;
            _eventAggregator.GetEvent<RaiseNotification>().Subscribe(OnRaiseNotification);
            _eventAggregator.GetEvent<BusyIndicatorChangeNotification>()
                .Subscribe(OnBusyIndicatorNotification, ThreadOption.PublisherThread, true);
            _eventAggregator.GetEvent<TestEvent>().Subscribe(OnTestEvent);
        }
        #endregion

        #region Methods

        public void OnTestEvent(TestEventArg arg)
        {
            switch (arg.Status)
            {
                case TestEventStatus.TestEnded:
                    IsEnabled = true;
                    break;
                case TestEventStatus.TestStarted:
                    IsEnabled = false;
                    break;
            }
        }
        public ContextMenu GetContextMenu()
        {
            lock (MyLock)
            {
                if (null == _contextMenu)
                {
                    BuildContextMenu();
                }

                return _contextMenu;
            }
        }

        public void SetMenuItems(string[] items)
        {
            _menuItems = items;
            BuildContextMenu();
        }

        public void ClearMenuItems()
        {
            _menuItems = new string[0];
        }

        private void BuildContextMenu()
        {
            lock (MyLock)
            {
                _contextMenu = new ContextMenu();
                _contextMenu.SetValue(AutomationProperties.AutomationIdProperty, "HamburgerMenu");
                foreach (var item in _menuItems)
                {
                    if (string.IsNullOrWhiteSpace(item))
                    {
                        _contextMenu.Items.Add(new Separator());
                    }
                    else
                    {
                        var mia = new MenuItem() { Header = item };
                        mia.SetValue(AutomationProperties.AutomationIdProperty, $"MenuItem_{item.Replace(" ", "")}");
                        mia.Command = new MenuCommand(item, ItemPressed);
                        _contextMenu.Items.Add(mia);
                    }
                }
            }
        }

        private void ItemPressed(string id)
        {
            MenuItemPressed?.Invoke(id);
        }
        public void Unset()
        {
        }

        public void OnSetActive()
        {
        }
        public void Cleanup()
        {
        }

        public Task CleanupAsync()
        {
            return Task.CompletedTask;
        }

        public void Initialize()
        {
        }

        public void Initialize(object parameter)
        {
        }

        public void Initialize(object parameter, object model)
        {
        }

        public Task InitializeAsync()
        {
            return Task.CompletedTask;
        }

        public Task InitializeAsync(object parameter)
        {
            return Task.CompletedTask;
        }

        public void Activated()
        {
        }

        /// <summary>
        /// Private Event handler for RaiseNotification event.
        /// </summary>
        private void OnBusyIndicatorNotification(bool eventArg)
        {
            IsBusy = eventArg;
        }

        /// <summary>
        /// Private Event handler for RaiseNotification event.
        /// </summary>
        private void OnRaiseNotification(NotificationContentEventArgs eventArgsWithTitle)
        {
            // The NotificationRequest.Raise triggers the Invoke() method of the PopupWindowAction object to show the NotificationWindow window
            // Notification object expects a NotificationContentEventArgsWithoutTitle object and a Title string.
            var eventArgsWithoutTitle = new NotificationContentEventArgs(eventArgsWithTitle.Message, "",
                eventArgsWithTitle.Image, string.Empty);

            NotificationRequest.Raise(new Notification
            {
                Content = eventArgsWithoutTitle,
                Title = eventArgsWithTitle.Title
            });
        }

        public void EnableMenu(bool enable)
        {
            IsEnabled = enable;
        }
        #endregion

        #region Properties
        private bool isEnabled = true;
        public bool IsEnabled
        {
            get => isEnabled;
            private set
            {
                isEnabled = value;
                OnPropertyChanged("IsEnabled");
            }

        }
        public MenuItemPressedDelegate MenuItemPressed { get; set; }
        private static object MyLock = new object();
        private string[] _menuItems = new string[0];
        private ContextMenu _contextMenu;
        public bool IsDirty { get; private set; }
        private bool _isBusy;

        public bool IsBusy
        {
            get => _isBusy;
            set
            {
                _isBusy = value;
                OnPropertyChanged("IsBusy");
            }
        }

        private bool _isMenuIncluded;

        public bool IsMenuIncluded
        {
            get => _isMenuIncluded;
            set
            {
                _isMenuIncluded = value;
                OnPropertyChanged("IsMenuIncluded");
            }
        }

        private bool _isNavigationIncluded;

        public bool IsNavigationIncluded
        {
            get => _isNavigationIncluded;
            set
            {
                _isNavigationIncluded = value;
                OnPropertyChanged("IsNavigationIncluded");
            }
        }

        #endregion Properties

        #region Commands

        #endregion
    }
}