sharee.bike-App/LastenradBayern/ShareeBike/ViewModel/RootShell/AppShellViewModel.cs

using System.ComponentModel;
using ShareeBike.MultilingualResources;
using ShareeBike.Services;
using ShareeBike.Services.CopriApi.ServerUris;
using ShareeBike.View.Themes;
using ShareeBike.ViewModel.LegalInformation;

namespace ShareeBike.ViewModel.RootShell
{
	public class AppShellViewModel : INotifyPropertyChanged
	{
		public AppShellViewModel()
		{
			App.ModelRoot.ActiveUser.StateChanged += (sender, eventargs) =>
			{
				// Login state changed. Update related menu entries.
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsMyBikesPageVisible)));
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsAccountPageVisible)));
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsLoginPageVisible)));
			};

			// Update flyout view model whenever theme is switched.
			App.ModelRoot.Themes.PropertyChanged += (sender, eventargs) =>
			{
				if (!(sender is ServicesContainerMutableT<object> themes))
					return;

				MasterDetailMenuTitle = GetMasterDetailMenuTitle(themes.Active);

				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(MasterDetailMenuTitle)));
			};

			MasterDetailMenuTitle = GetMasterDetailMenuTitle(App.ModelRoot.Themes.Active);
		}

		/// <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 ShareeBike.Themes.ShareeBike.OPERATORINFO;

			return $"{(!string.IsNullOrEmpty(active.OperatorInfo) ? ($"{active.OperatorInfo}") : "sharee.bike")}";
		}

		/// <summary>
		/// Holds the title of the flyout page.
		/// </summary>
		public string MasterDetailMenuTitle { get; private set; }

		public event PropertyChangedEventHandler PropertyChanged;

		public bool IsMyBikesPageVisible => App.ModelRoot.ActiveUser.IsLoggedIn;

		public bool IsAccountPageVisible => App.ModelRoot.ActiveUser.IsLoggedIn;

		public bool IsLoginPageVisible => !App.ModelRoot.ActiveUser.IsLoggedIn;
	}
}