sharee.bike-App/TINKLib/ViewModel/Info/BikeInfo/BikeInfoCarouseltemViewModel.cs

using System;
using System.Windows.Input;
using Xamarin.Forms;

namespace TINK.ViewModel.Info.BikeInfo
{
	public class CourouselPageItemViewModel
	{
		public CourouselPageItemViewModel(
			string p_strTitle,
			string p_strLegend,
			int p_iCurrentPageIndex,
			Func<int> p_iPagesCountProvider,
			Action p_oCloseAction,
			ImageSource image = null)
		{
			Title = p_strTitle;
			IsImageVisble = image != null;
			if (IsImageVisble)
			{
				Image = image;
			}

			DescriptionText = p_strLegend;
			CurrentPageIndex = p_iCurrentPageIndex;
			PagesCountProvider = p_iPagesCountProvider;
			CloseAction = p_oCloseAction;
		}

		/// <summary> Gets the title of the navigation page. </summary>
		public string Title { get; }

		public bool IsImageVisble { get; }

		/// <summary> Gets the image. </summary>
		public ImageSource Image { get; }

		/// <summary> Gets the text which describes the image. </summary>
		public string DescriptionText { get; }

		/// <summary> Get the progress of the carousselling progress.</summary>
		public double ProgressValue
		{
			get
			{
				var l_oCount = PagesCountProvider();

				return l_oCount > 0 ? (double)CurrentPageIndex / l_oCount : 0;
			}
		}

		/// <summary> Gets if user can leave carousel page.</summary>
		public bool IsCloseVisible
		{
			get
			{
				return PagesCountProvider() == CurrentPageIndex;
			}
		}

		/// <summary> Command object to bind close button to view model. </summary>
		public ICommand OnCloseRequest
		{
			get
			{
				return new Command(() => CloseAction());
			}
		}

		/// <summary> Returns one based index of the current page. </summary>
		private int CurrentPageIndex { get; }

		/// <summary> Gets the count of carousel pages. </summary>
		private Func<int> PagesCountProvider { get; }

		/// <summary> Action to actuate when close is invoked. </summary>
		private Action CloseAction { get; }
	}
}