Version 3.0.255

Meinkonrad/TINK/ViewModel/RootFlyout/RootPageViewModel.cs

@@ -0,0 +1,196 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using TINK.Services.CopriApi.ServerUris;
+using TINK.View;
+using TINK.View.Account;
+using TINK.View.Contact;
+using TINK.View.Info;
+using TINK.View.Login;
+using TINK.View.Map;
+using TINK.View.FindBike;
+using TINK.View.MyBikes;
+using TINK.View.Root;
+using TINK.View.Settings;
+using Xamarin.Forms;
+using TINK.ViewModel.MasterDetail;
+#if USEFLYOUT
+using TINK.View.MasterDetail;
+#endif
+using TINK.Services;
+using TINK.View.Themes;
+
+namespace TINK.ViewModel.Root
+{
+    /// <summary>
+    /// View model for flyout menu entries. Respositility
+    /// - populates entries depending on app state on showing menu
+    /// - updates menu denpending on app state change, i.e. user logs in/ out. 
+    /// </summary>
+    public class RootPageFlyoutViewModel : INotifyPropertyChanged
+    {
+        /// <summary>
+        /// Dictionary to manage collection of menu items.
+        /// </summary>
+        private Dictionary<Type, int> m_oEntryDictionary;
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        /// <summary> Updates menu entries depending on state. </summary>
+        private void UpdateMenuEntries()
+        {
+            for (int l_iIndex = MenuItems.Count - 1; l_iIndex >= 0; l_iIndex--)
+            {
+                MenuItems.Clear();
+                m_oEntryDictionary.Clear();
+            }
+
+            CheckAddItem(typeof(MapPage));
+
+            if (App.ModelRoot.ActiveUser.IsLoggedIn)
+            {
+                CheckAddItem(typeof(MyBikesPage));
+                CheckAddItem(typeof(FindBikePage));
+                CheckAddItem(typeof(AccountPage));
+            }
+            else
+            {
+                CheckAddItem(typeof(LoginPage));
+            }
+
+            if (App.ModelRoot.Uris.ActiveUri.Host.GetIsCopri()
+                || App.ModelRoot.ActiveUser.IsLoggedIn)
+            {
+                CheckAddItem(typeof(SettingsPage));
+            }
+
+            CheckAddItem(typeof(FeesAndBikesPage)); // Fees and bikes
+
+            CheckAddItem(typeof(ContactPage)); // Feedback and contact
+
+            CheckAddItem(typeof(TabbedPageInfo)); // About sharee.bike
+        }
+
+        /// <summary>Adds a menu item to master detail menu.</summary>
+        /// <param name="p_oType">Type decribing entry to be added.</param>
+        private void CheckAddItem(Type p_oType)
+        {
+            if (m_oEntryDictionary.ContainsKey(p_oType))
+            {
+                // Nothing to do because has already been added.
+                return;
+            }
+
+            m_oEntryDictionary.Add(
+                p_oType,
+                m_oEntryDictionary.Count);
+
+            MenuItems.Add(new RootPageFlyoutMenuItem {
+                TargetType = p_oType,
+                GlyphCode = Helper.GetGlyphCode(p_oType),
+                Title = Helper.GetCaption(p_oType),
+                Id = m_oEntryDictionary[p_oType] }) ;
+        }
+
+        /// <summary> Removes a page from menu.</summary>
+        /// <param name="p_oType"></param>
+        private void RemoveItem(Type p_oType)
+        {
+            if (!m_oEntryDictionary.ContainsKey(p_oType))
+            {
+                // Nothing to do because item was never added/ already removed.
+                return;
+            }
+
+            MenuItems.Remove(MenuItems[m_oEntryDictionary[p_oType]]);
+            m_oEntryDictionary.Remove(p_oType);
+        }
+
+        public RootPageFlyoutViewModel()
+        {
+            MenuItems = new ObservableCollection<RootPageFlyoutMenuItem>();
+            m_oEntryDictionary = new Dictionary<Type, int>();
+
+            // Update menu entries on login/ logout actions.
+            App.ModelRoot.ActiveUser.StateChanged += (sender, eventargs) => OnUpdateRequired();
+
+            // Update flyout view model whenever theme is switched.
+            App.ModelRoot.Themes.PropertyChanged += (sender, eventargs) =>
+            {
+                if (!(sender is ServicesContainerMutable<object> themes))
+                    return;
+
+                MasterDetailMenuTitlte = GetMasterDetailMenuTitle(themes.Active);
+
+                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(MasterDetailMenuTitlte)));
+            };
+
+            MasterDetailMenuTitlte = GetMasterDetailMenuTitle(App.ModelRoot.Themes.Active);
+
+            UpdateMenuEntries();
+        }
+
+        /// <summary>
+        /// Gets the flyout title from theme name
+        /// </summary>
+        /// <param name="theme">Name of theme.</param>
+        /// <returns>Flyout title.</returns>
+        private string GetMasterDetailMenuTitle(object theme)
+        {
+            if (!(theme is ITheme active))
+                return Themes.Konrad.OPERATORINFO;
+
+            return $"{(!string.IsNullOrEmpty(active.OperatorInfo) ? ($"{active.OperatorInfo}") : "sharee.bike")}";
+        }
+
+        /// <summary>
+        /// Holds the title of the fylout page.
+        /// </summary>
+        public string MasterDetailMenuTitlte { get; private set; }
+
+
+        /// <summary>
+        /// Provides collection of menu items for master page.
+        /// </summary>
+        public ObservableCollection<RootPageFlyoutMenuItem> MenuItems
+        {
+            get; private set;
+        }
+
+        /// <summary>
+        /// Gets or sets the selected item.
+        /// </summary>
+        public MainPageMenuItem SelectedMenuItem
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Command object which is invoked from view when an item is selected.
+        /// </summary>
+        public Command MenuItemSelected
+        {
+            get
+            {
+                return new Command(OnUpdateRequired);
+            }
+
+        }
+
+        /// <summary> Manges updates required due to selection of a menu or login events.</summary>
+        public void OnUpdateRequired()
+        {
+
+            UpdateMenuEntries();
+
+            if (SelectedMenuItem == null)
+            {
+                // Nothing to do if no menu entry is selected.
+                return;
+            }
+        }
+    }
+}