sharee.bike-App/TINKLib/ViewModel/FeesAndBikes/FeesAndBikesPageViewModel.cs

using System.ComponentModel;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace TINK.ViewModel.Contact
{
	public class FeesAndBikesPageViewModel : INotifyPropertyChanged
	{
		public event PropertyChangedEventHandler PropertyChanged;


		/// <summary> Holds value wether site caching is on or off.</summary>
		bool IsSiteCachingOn { get; }

		private string FeesResourcePath { get; }

		private string BikesResourcePath { get; }


		/// <summary> Constructs view model.</summary>
		/// <param name="isSiteCachingOn">Set of user permissions</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>
		public FeesAndBikesPageViewModel(
			string hostName,
			string feesResourcePath,
			string bikesResourcePath,
			bool isSiteCachingOn)
		{
			HostName = hostName;
			FeesResourcePath = feesResourcePath;
			BikesResourcePath = bikesResourcePath;
			IsSiteCachingOn = isSiteCachingOn;
		}

		/// <summary> Holds the name of the host.</summary>
		private string HostName { get; }

		/// <summary> Called when page is shown. </summary>
		public async void OnAppearing()
		{
			RentBikeText = new HtmlWebViewSource
			{
				Html = !string.IsNullOrEmpty(FeesResourcePath)
					? await ViewModelHelper.GetSource($"https://{HostName}/{FeesResourcePath}" /* "site/tariff_info_1.html" */, IsSiteCachingOn)
					: await Task.FromResult(ViewModelHelper.FromBody("No fees resource available. Resource path is null or empty."))
			};

			TypesOfBikesText = new HtmlWebViewSource
			{
				Html = !string.IsNullOrEmpty(BikesResourcePath)
					? await ViewModelHelper.GetSource($"https://{HostName}/{BikesResourcePath}" /*"site/bike_info.html"*/, IsSiteCachingOn)
					: await Task.FromResult(ViewModelHelper.FromBody("No bikes instruction resource available. Resource path is null or empty."))
			};
		}

		private HtmlWebViewSource rentBikeText;

		private HtmlWebViewSource typesOfBikesText;

		public HtmlWebViewSource RentBikeText
		{
			get => rentBikeText;
			set
			{
				rentBikeText = value;
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(RentBikeText)));
			}
		}

		public HtmlWebViewSource TypesOfBikesText
		{
			get => typesOfBikesText;
			set
			{
				typesOfBikesText = value;
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(TypesOfBikesText)));
			}
		}
	}
}