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DataPRO/Modules/Realtime/RealtimeModule/ViewModel/RealtimeChannelSelectViewModel.cs

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+using System.Collections.Generic;
+using System.ComponentModel;
+using System.ComponentModel.Composition;
+using System.Linq;
+using System.Threading.Tasks;
+using DTS.Common.Events;
+using DTS.Common.Events.Realtime;
+using DTS.Common.Interactivity;
+using DTS.Common.Interface.Realtime;
+using Prism.Events;
+using Prism.Regions;
+using Unity;
+
+
+// ReSharper disable CheckNamespace
+// ReSharper disable MemberCanBePrivate.Global
+// ReSharper disable InconsistentNaming
+
+namespace RealtimeModule
+{
+    /// <summary>
+    /// this class handles RealtimeModule functionality
+    /// </summary>
+    [PartCreationPolicy(CreationPolicy.Shared)]
+    public class RealtimeChannelSelectViewModel : IRealtimeChannelSelectViewModel
+    {
+        /// <summary>
+        /// The IRealtimeChannelSelect view
+        /// </summary>
+        public IRealtimeChannelSelectView ChannelSelectView { get; set; }
+
+        private IEventAggregator _eventAggregator { 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 RealtimeChannelSelectViewModel
+        /// </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>
+        // ReSharper disable once UnusedParameter.Local
+        public RealtimeChannelSelectViewModel(IRealtimeChannelSelectView view, IRegionManager regionManager,
+            // ReSharper disable once UnusedParameter.Local
+            IEventAggregator eventAggregator, IUnityContainer unityContainer)
+        {
+            ChannelSelectView = view;
+            ChannelSelectView.DataContext = this;
+
+            NotificationRequest = new InteractionRequest<Notification>();
+            ConfirmationRequest = new InteractionRequest<Confirmation>();
+
+            _eventAggregator = eventAggregator;
+            _eventAggregator.GetEvent<RaiseNotification>().Subscribe(OnRaiseNotification);
+            _eventAggregator.GetEvent<BusyIndicatorChangeNotification>()
+                .Subscribe(OnBusyIndicatorNotification, ThreadOption.PublisherThread, true);
+        }
+        #endregion
+
+        #region Methods
+        /// <summary>
+        /// sets all available channels which are then filtered and displayed
+        /// </summary>
+        /// <param name="channels"></param>
+        public void SetAvailableChannels(IRealtimeChannel[] channels)
+        {
+            _allChannels = channels;
+            Filter();
+        }
+        /// <summary>
+        /// filters and displays channels
+        /// </summary>
+        private void Filter()
+        {
+            var channels = new List<IRealtimeChannel>();
+            if (string.IsNullOrWhiteSpace(_searchTerm))
+            {
+                channels.AddRange(_allChannels);
+            }
+            else
+            {
+                var ci = System.Globalization.CultureInfo.CurrentCulture;
+                channels.AddRange(_allChannels.Where(channel =>
+                    ci.CompareInfo.IndexOf(channel.ToString(), _searchTerm,
+                        System.Globalization.CompareOptions.IgnoreCase) >= 0));
+            }
+            RealtimeChannels = channels.ToArray();
+            OnPropertyChanged("RealtimeChannels");
+        }
+        public void Unset()
+        {
+        }
+
+        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
+            });
+        }
+        /// <summary>
+        /// sets the string used to filter, then filters
+        /// </summary>
+        /// <param name="searchText"></param>
+        public void SetSearchText(string searchText)
+        {
+            _searchTerm = searchText;
+            Filter();
+        }
+        /// <summary>
+        /// called to notify realtime that a channel has been selected
+        /// </summary>
+        /// <param name="channel"></param>
+        public void SetRealtimeChannel(IRealtimeChannel channel)
+        {
+            _eventAggregator.GetEvent<RealtimeChannelSelectedEvent>().Publish(channel);
+        }
+        #endregion methods
+        #region properties
+        /// <summary>
+        /// contains all channels [not filtered]
+        /// </summary>
+        private IRealtimeChannel[] _allChannels;
+        /// <summary>
+        /// contains channels to be displayed [filtered]
+        /// </summary>
+        public IRealtimeChannel[] RealtimeChannels { get; set; } = new IRealtimeChannel[0];
+
+        public bool IsDirty => false;
+        private string _searchTerm = "";
+        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
+    }
+}