Initial version.

TINKLib/ViewModel/Bikes/Bike/BC/BikeViewModel.cs

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+using System;
+using System.ComponentModel;
+using TINK.Model.Connector;
+using TINK.Model.User;
+using TINK.View;
+using TINK.ViewModel.Bikes.Bike.BC.RequestHandler;
+using BikeInfoMutable = TINK.Model.Bike.BC.BikeInfoMutable;
+
+namespace TINK.ViewModel.Bikes.Bike.BC
+{
+    /// <summary>
+    /// View model for a BC bike.
+    /// Provides functionality for views
+    /// - MyBikes
+    /// - BikesAtStation
+    /// </summary>
+    public class BikeViewModel : BikeViewModelBase, INotifyPropertyChanged
+    {
+        /// <summary>
+        /// Notifies GUI about changes.
+        /// </summary>
+        public override event PropertyChangedEventHandler PropertyChanged;
+
+        /// <summary> Holds object which manages requests. </summary>
+        private IRequestHandler RequestHandler { get; set; }
+
+        /// <summary> Raises events in order to update GUI.</summary>
+        public override void RaisePropertyChanged(object sender, PropertyChangedEventArgs eventArgs) => PropertyChanged?.Invoke(sender, eventArgs);
+
+        /// <summary>
+        /// Constructs a bike view model object.
+        /// </summary>
+        /// <param name="selectedBike">Bike to be displayed.</param>
+        /// <param name="activeUser">Object holding logged in user or an empty user object.</param>
+        /// <param name="stateInfoProvider">Provides in use state information.</param>
+        /// <param name="bikesViewModel">View model to be used for progress report and unlocking/ locking view.</param>
+        public BikeViewModel(
+            Func<bool> isConnectedDelegate,
+            Func<bool, IConnector> connectorFactory,
+            Action<int> bikeRemoveDelegate,
+            Func<IPollingUpdateTaskManager> viewUpdateManager,
+            IViewService viewService,
+            BikeInfoMutable selectedBike,
+            IUser activeUser,
+            IInUseStateInfoProvider stateInfoProvider,
+            IBikesViewModel bikesViewModel) : base(isConnectedDelegate, connectorFactory, bikeRemoveDelegate, viewUpdateManager, viewService, selectedBike, activeUser, stateInfoProvider, bikesViewModel)
+        {
+            RequestHandler = activeUser.IsLoggedIn
+                ? RequestHandlerFactory.Create(
+                    selectedBike,
+                    isConnectedDelegate,
+                    connectorFactory,
+                    viewUpdateManager,
+                    viewService,
+                    bikesViewModel,
+                    ActiveUser)
+                : new NotLoggedIn(
+                    selectedBike.State.Value,
+                    viewService,
+                    bikesViewModel,
+                    ActiveUser);
+        }
+
+        /// <summary>
+        /// Handles BikeInfoMutable events. 
+        /// Helper member to raise events. Maps model event change notification to view model events.
+        /// Todo: Check which events are received here and filter, to avoid event storm.
+        /// </summary>
+        /// <param name="p_strNameOfProp"></param>
+        public override void OnSelectedBikeStateChanged ()
+        {
+            RequestHandler = RequestHandlerFactory.Create(
+                bike,
+                IsConnectedDelegate,
+                ConnectorFactory,
+                ViewUpdateManager,
+                ViewService,
+                BikesViewModel,
+                ActiveUser);
+
+            var handler = PropertyChanged;
+            if (handler != null)
+            {
+                handler(this, new PropertyChangedEventArgs(nameof(ButtonText)));
+                handler(this, new PropertyChangedEventArgs(nameof(IsButtonVisible)));
+            }
+        }
+
+        /// <summary> Gets visiblity of the copri command button. </summary>
+        public bool IsButtonVisible => RequestHandler.IsButtonVisible;
+
+        /// <summary> Gets the text of the copri command button. </summary>
+        public string ButtonText => RequestHandler.ButtonText;
+
+        /// <summary> Processes request to perform a copri action (reserve bike and cancel reservation). </summary>
+        public System.Windows.Input.ICommand OnButtonClicked => new Xamarin.Forms.Command(async () =>
+        {
+            var lastHandler = RequestHandler;
+            RequestHandler = await RequestHandler.HandleRequest();
+
+            if (lastHandler.IsRemoveBikeRequired)
+            {
+                BikeRemoveDelegate(Id);
+            }
+
+            if (lastHandler.GetType() == RequestHandler.GetType())
+            {
+                // No state change occurred.
+                return;
+            }
+
+            // State changed and instance of request handler was switched. 
+            if (lastHandler.ButtonText != ButtonText)
+            {
+                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ButtonText)));
+            }
+
+            if (lastHandler.IsButtonVisible != IsButtonVisible)
+            {
+                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsButtonVisible)));
+            }
+        });
+    }
+}