Initial version.

TINKLib/ViewModel/Map/TinkKonradToggleViewModel.cs

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+using System.Collections.Generic;
+using System.Linq;
+using TINK.Model;
+using TINK.Model.Connector;
+using Xamarin.Forms;
+
+namespace TINK.ViewModel.Map
+{
+    /// <remarks> Old name: MapPageFilter. </remarks>
+    public class TinkKonradToggleViewModel : ITinkKonradToggleViewModel
+    {
+        /// <summary> Constructs a map page filter view model object from values.</summary>
+        /// <param name="currentFilter">Filters and options dictionary.</param>
+        public TinkKonradToggleViewModel(IGroupFilterMapPage currentFilter)
+        {
+            FilterDictionary = currentFilter ?? new GroupFilterMapPage();
+        }
+
+        /// <summary> Gets the filter values.</summary>
+        public IGroupFilterMapPage FilterDictionary { get; }
+
+        /// <summary> Gets the activated filter.</summary>
+        public string CurrentFilter {
+            get
+            {
+                return FilterDictionary.FirstOrDefault(x => x.Value == FilterState.On).Key ?? string.Empty;
+            }
+        }
+
+        /// <summary> Gets value whether TINK is enabled or not. </summary>
+        public bool IsTinkEnabled => !string.IsNullOrEmpty(CurrentFilter) && CurrentFilter != FilterHelper.FILTERTINKGENERAL;
+
+        /// <summary> Gets color of the TINK button. </summary>
+        public Color TinkColor => CurrentFilter == FilterHelper.FILTERTINKGENERAL ? Color.Blue : Color.Gray;
+
+        /// <summary> Gets value whether Konrad is enabled or not. </summary>
+        public bool IsKonradEnabled => !string.IsNullOrEmpty(CurrentFilter) && CurrentFilter != FilterHelper.FILTERKONRAD;
+
+        /// <summary> Gets color of the Konrad button. </summary>
+        public Color KonradColor => CurrentFilter == FilterHelper.FILTERKONRAD ? Color.Red : Color.Gray;
+
+        /// <summary> Gets whether toggle functionality is visible or not. </summary>
+        public bool IsToggleVisible =>  
+            FilterDictionary.ContainsKey(FilterHelper.FILTERKONRAD) 
+            && FilterDictionary.ContainsKey(FilterHelper.FILTERTINKGENERAL)
+            && (IsTinkEnabled || IsKonradEnabled);
+
+        /// <summary>
+        /// Toggles from bike group TINK to Konrad or vice versa.
+        /// Toggling means one of 
+        /// - TINK => Konrad or
+        /// - TINK => Konrad.
+        /// </summary>
+        /// <param name="p_strCurrentFilterSet">Filter set to toggle.</param>
+        /// <returns></returns>
+        public TinkKonradToggleViewModel DoToggle()
+        {
+            var l_oCurrentFilterSet = FilterDictionary.ToArray();
+
+            if (l_oCurrentFilterSet.Length < 2)
+            {
+                // There is nothing to toggle because filter set contains only one element.
+                return new TinkKonradToggleViewModel(FilterDictionary);
+            }
+
+            var l_oCurrentState = l_oCurrentFilterSet[l_oCurrentFilterSet.Length - 1].Value == FilterState.On
+                ? FilterState.On
+                : FilterState.Off;
+
+            var l_oToggledFilterSet = new Dictionary<string, FilterState>();
+
+            foreach (var l_oFilterElement in l_oCurrentFilterSet)
+            {
+                l_oToggledFilterSet.Add(l_oFilterElement.Key, l_oCurrentState);
+                l_oCurrentState = l_oFilterElement.Value;
+            }
+
+            return new TinkKonradToggleViewModel(new GroupFilterMapPage(l_oToggledFilterSet));
+        }
+    }
+}