Initial version.

TINKLib/View/IViewService.cs

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+using System;
+using System.Threading.Tasks;
+
+namespace TINK.View
+{
+    public interface IViewService
+    {
+        /// <summary> Displays alert message. </summary>
+        /// <param name="title">Title of message.</param>
+        /// <param name="message">Message to display.</param>
+        /// <param name="cancel">Text of button.</param>
+        Task DisplayAlert(
+            string title, 
+            string message, 
+            string cancel);
+
+        /// <summary> Displays alert message. </summary>
+        /// <param name="title">Title of message.</param>
+        /// <param name="message">Message to display.</param>
+        /// <param name="details">Detailed error description.</param>
+        /// <param name="cancel">Text of button.</param>
+        Task DisplayAdvancedAlert(
+            string title, 
+            string message, 
+            string details, 
+            string cancel);
+
+        /// <summary> Displays alert message. </summary>
+        /// <param name="p_strTitle">Title of message.</param>
+        /// <param name="p_strMessage">Message to display.</param>
+        /// <param name="p_strAccept">Text of accept button.</param>
+        /// <param name="p_strCancel">Text of button.</param>
+        /// <returns>True if user pressed accept.</returns>
+        Task<bool> DisplayAlert(string p_strTitle, string p_strMessage, string p_strAccept, string p_strCancel);
+
+        /// <summary> Displays an action sheet. </summary>
+        /// <param name="title">Title of message.</param>
+        /// <param name="p_strMessage">Message to display.</param>
+        /// <param name="cancel">Text of button.</param>
+        /// <param name="destruction"></param>
+        /// <param name="buttons">Buttons holding options to select.</param>
+        /// <returns>T</returns>
+        Task<string> DisplayActionSheet(string title, string cancel, string destruction, params string[] buttons);
+
+        /// <summary> Show a page.</summary>
+        /// <param name="type">Type of page to show.</param>
+        /// <param name="title">Title of page to show.</param>
+        void ShowPage(ViewTypes type, string title = null);
+
+        /// <summary> Pushes a page onto the stack. </summary>
+        /// <param name="typeOfPage">Page to display.</param>
+        Task PushAsync(ViewTypes typeOfPage);
+
+        /// <summary> Pushes a page onto the modal stack. </summary>
+        /// <param name="typeOfPage">Page to display.</param>
+        Task PushModalAsync(ViewTypes typeOfPage);
+
+        /// <summary> Pushes a page onto the modal stack. </summary>
+        Task PopModalAsync();
+
+        Task<IUserFeedback> DisplayUserFeedbackPopup();
+
+        /// <summary>
+        /// Feedback given by user when returning bike.
+        /// </summary>
+        public interface IUserFeedback
+        {
+            /// <summary>
+            /// Holds whether bike is broken or not.
+            /// </summary>
+            bool IsBikeBroken { get; set; }
+
+            /// <summary>
+            /// Holds either 
+            /// - general feedback
+            /// - error description of broken bike 
+            /// or both.
+            /// </summary>
+            string Message { get; set; }
+        }
+    }
+}

TINKLib/View/MasterDetail/EmptyNavigationMasterDetail.cs

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+using Serilog;
+using System;
+
+namespace TINK.View.MasterDetail
+{
+    public class EmptyNavigationMasterDetail : INavigationMasterDetail
+    {
+        public bool IsGestureEnabled { set => Log.ForContext<EmptyNavigationMasterDetail>().Error($"Unexpected call of {nameof(IsGestureEnabled)} detected."); }
+
+        public void ShowPage(Type p_oTypeOfPage, string p_strTitle = null)
+        {
+            Log.ForContext<EmptyNavigationMasterDetail>().Error($"Unexpected call of {nameof(ShowPage)} detected.");
+        }
+    }
+}

TINKLib/View/MasterDetail/IDetailPage.cs

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+using TINK.View.MasterDetail;
+
+namespace TINK.View
+{
+    /// <summary>
+    /// Interface to provide navigation functionality to detail page.
+    /// </summary>
+    public interface IDetailPage
+    {
+        /// <summary>
+        /// Delegate to perform navigation.
+        /// </summary>
+        INavigationMasterDetail NavigationMasterDetail { set; }
+    }
+}

TINKLib/View/MasterDetail/INavigationMasterDetail.cs

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+using System;
+
+namespace TINK.View.MasterDetail
+{
+    public interface INavigationMasterDetail
+    {
+        /// <summary>
+        /// Creates and a page an shows it.
+        /// </summary>
+        /// <param name="p_oTypeOfPage">Type of page to show.</param>
+        void ShowPage(Type p_oTypeOfPage, string p_strTitle = null);
+
+        /// <summary>
+        /// Set a value indicating whether master deatail navigation menu is available or not.
+        /// </summary>
+        bool IsGestureEnabled { set; }
+    }
+}

TINKLib/View/Themes/ITheme.cs

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+namespace TINK.View.Themes
+{
+    public interface ITheme
+    {
+        string OperatorInfo { get; }
+    }
+}

TINKLib/View/Themes/Konrad.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ResourceDictionary xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="TINK.Themes.Konrad">
+    <!-- Pallete -->
+    <Color x:Key="primary-back-title-color">Red</Color>
+    <!-- Pallete-end -->
+    <Style ApplyToDerivedTypes="true" TargetType="NavigationPage">
+        <Setter Property="BarBackgroundColor" Value="{DynamicResource Key=primary-back-title-color}"/>
+    </Style>
+</ResourceDictionary>

TINKLib/View/Themes/Konrad.xaml.cs

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+using TINK.View.Themes;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace TINK.Themes
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	public partial class Konrad : ResourceDictionary, ITheme
+	{
+		public Konrad ()
+		{
+			InitializeComponent ();
+		}
+
+        public string OperatorInfo => "Konrad Konstanz";
+    }
+}

TINKLib/View/Themes/ShareeBike.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ResourceDictionary xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="TINK.Themes.ShareeBike">
+    <!-- Pallete -->
+    <Color x:Key="primary-back-title-color">#009899</Color>
+    <!-- Pallete-end -->
+    <Style ApplyToDerivedTypes="true" TargetType="NavigationPage">
+        <Setter Property="BarBackgroundColor" Value="{DynamicResource Key=primary-back-title-color}"/>
+    </Style>
+</ResourceDictionary>

TINKLib/View/Themes/ShareeBike.xaml.cs

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+using TINK.View.Themes;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace TINK.Themes
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	public partial class ShareeBike : ResourceDictionary, ITheme
+	{
+		public ShareeBike ()
+		{
+			InitializeComponent ();
+		}
+
+        public string OperatorInfo => string.Empty;
+    }
+}