Initial version.

TINKLib/ViewModel/WhatsNew/Agb/AgbViewModel.cs

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+using TINK.View;
+using System.Windows.Input;
+using Xamarin.Forms;
+using System;
+using System.ComponentModel;
+using System.Threading.Tasks;
+using TINK.ViewModel.Info;
+using TINK.Model.User.Account;
+
+namespace TINK.ViewModel.WhatsNew.Agb
+{
+    public class AgbViewModel : INotifyPropertyChanged
+    {
+        /// <summary> Fired whenever a property changed.</summary>
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        /// <summary> Holds the name of the host.</summary>
+        private string HostName { get; }
+
+        /// <summary> Holds value wether site caching is on or off.</summary>
+        bool IsSiteCachingOn { get; }
+
+        /// <summary> Constructs AGB view model</summary>
+        /// <param name="isSiteCachingOn">Holds value wether site caching is on or off.</param>
+        /// <param name="resourceProvider">Delegate to get an an embedded html ressource. Used as fallback if download from web page does not work and cache is empty.</param>
+        /// <param name="p_oViewService">View service to close page.</param>
+        public AgbViewModel(
+            string hostName,
+            bool isSiteCachingOn,
+            Func<string, string> resourceProvider,
+            IViewService p_oViewService)
+        {
+            HostName = hostName;
+
+            IsSiteCachingOn = isSiteCachingOn;
+
+            ViewService = p_oViewService
+                ?? throw new ArgumentException($"Can not instantiate {typeof(WhatsNewViewModel)}-object. No view available.");
+
+            ResourceProvider = resourceProvider
+                ?? throw new ArgumentException($"Can not instantiate {typeof(WhatsNewViewModel)}-object. No ressource provider availalbe.");
+        }
+
+        /// <summary> Gets the platfrom specific prefix. </summary>
+        private Func<string, string> ResourceProvider { get; set; }
+
+        /// <summary> Agb information text.</summary>
+        private HtmlWebViewSource infoAgb;
+
+        /// <summary> Agb information text.</summary>
+        public HtmlWebViewSource InfoAgb
+        {
+            get => infoAgb;
+            set
+            {
+                infoAgb = value;
+                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(InfoAgb)));
+            }
+        }
+
+        /// <summary> Called when page is shown. </summary>
+        public async Task OnAppearing()
+        {
+            InfoAgb = await InfoViewModel.GetAgb(HostName, IsSiteCachingOn, ResourceProvider);
+        }
+
+        /// <summary> User clicks OK button.</summary>
+        public ICommand OnOk
+        {
+            get
+            {
+                return new Command(async () => await ViewService.PopModalAsync());
+            }
+        }
+
+        /// <summary> Reference to view service object.</summary>
+        private IViewService ViewService;
+    }
+}

TINKLib/ViewModel/WhatsNew/WhatsNewViewModel.cs

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+using TINK.View;
+using System.Windows.Input;
+using Xamarin.Forms;
+using System;
+using System.ComponentModel;
+
+namespace TINK.ViewModel.WhatsNew
+{
+    public class WhatsNewViewModel : INotifyPropertyChanged
+    {
+        /// <summary> Constructs view model. </summary>
+        /// <param name="currentVersion"></param>
+        /// <param name="whatsNewText"></param>
+        /// <param name="isShowAgbRequired"></param>
+        /// <param name="showMasterDetail">Delegate to invoke master detail.</param>
+        /// <param name="p_oViewService">View service to show agb- page.</param>
+        public WhatsNewViewModel(
+            Version currentVersion,
+            string whatsNewText,            
+            bool isShowAgbRequired,
+            Action showMasterDetail,
+            IViewService p_oViewService)
+        {
+            ViewService = p_oViewService
+               ?? throw new ArgumentException($"Can not instantiate {typeof(WhatsNewViewModel)}-object. No view available.");
+
+            ShowMasterDetail = showMasterDetail
+                ?? throw new ArgumentException($"Can not instantiate {typeof(WhatsNewViewModel)}-object. No delegate to activated maste detail page avilable.");
+
+            CurrentVersion = currentVersion;
+            WhatsNewText = new FormattedString();
+            WhatsNewText.Spans.Add(new Span { Text = whatsNewText });
+            IsAgbChangedVisible = isShowAgbRequired;
+        }
+
+        public Version CurrentVersion { get; }
+
+        public FormattedString WhatsNewText {get;}
+
+        /// <summary>
+        /// Title of the WhatsNewPage.
+        /// </summary>
+        public string WhatsNewTitle
+        {
+            get
+            {
+                // Get version info.
+                return $"Neu in Version {CurrentVersion}";
+            }
+        }
+
+        /// <summary> Text saying that AGBs were modified.</summary>
+        public FormattedString AgbChangedText
+        {
+            get
+            {
+                var l_oHint = new FormattedString();
+                l_oHint.Spans.Add(new Span { Text = "AGBs ", ForegroundColor = ViewModelHelper.LINK_COLOR });
+                l_oHint.Spans.Add(new Span { Text = "überarbeitet.\r\n" });
+                
+                return l_oHint;
+            }
+        }
+
+        public bool IsAgbChangedVisible { get; }
+
+        /// <summary> Command object to bind agb link to view model.</summary>
+        public ICommand OnShowAgbTapped
+        {
+            get
+            {
+                return new Command(async () => await ViewService.PushModalAsync(ViewTypes.AgbPage));
+            }
+        }
+
+        /// <summary> Called when dialog is disappearing.</summary>
+        /// <param name="setWhatsNewWasShown"></param>
+        public void OnDisappearing(Action setWhatsNewWasShown)
+        {
+            setWhatsNewWasShown();
+        }
+
+#if !SHOWFEEDBACK
+        public bool IsFeedbackVisible => false;
+#else
+        public bool IsFeedbackVisible => true;
+#endif
+        /// <summary> User clicks rate button.</summary>
+        public ICommand OnOk
+        {
+            get
+            {
+                return new Command(() => ShowMasterDetail());
+            }
+        }
+
+        /// <summary>Reference to view service object.</summary>
+        private IViewService ViewService;
+
+        /// <summary>Reference to view service object.</summary>
+        private Action ShowMasterDetail { get; }
+
+        /// <summary> Fired whenever a property changes.</summary>
+        public event PropertyChangedEventHandler PropertyChanged;
+    }
+}