sharee.bike-App/TINKLib/ViewModel/Settings/FilterItemMutable.cs

using System.ComponentModel;
using TINK.Model;

namespace TINK.ViewModel.Settings
{
	/// <summary>Holds filter item incluting full state (avaialble, activated, name, ...). </summary>
	public class FilterItemMutable : INotifyPropertyChanged
	{
		public event PropertyChangedEventHandler PropertyChanged;

		/// <summary> Switch value</summary>
		private bool m_bIsActivatedSwitch;

		/// <summary> Constructs a filter object. </summary>
		/// <param name="key">Key of the filter state.</param>
		/// <param name="filterState">State of filter, on or off.</param>
		/// <param name="isEnabled">If filter does not apply because user does not belong to group (TINK, Konrad, ...) filter is deactivated.</param>
		/// <param name="labelText">Text of the switch describing the filter.</param>
		public FilterItemMutable(
			string key,
			FilterState filterState,
			bool isEnabled,
			string labelText)
		{
			Text = labelText;
			IsEnabled = isEnabled;
			State = filterState;
			Key = key;
			m_bIsActivatedSwitch = isEnabled && filterState == FilterState.On;
		}

		/// <summary> Text describing the filter. </summary>
		public string Text { get; }

		/// <summary> True if switch can be toggeled.</summary>
		public bool IsEnabled { get; }

		/// <summary> True if switch is on.</summary>
		public bool IsActivated
		{
			get
			{
				return m_bIsActivatedSwitch;
			}

			set
			{
				if (m_bIsActivatedSwitch == value)
				{
					// Nothing to do.
					return;
				}

				m_bIsActivatedSwitch = value;
				if (!IsEnabled)
				{
					// Nothing to do if filter does not apply to user account.
					return;
				}

				State = m_bIsActivatedSwitch ? FilterState.On : FilterState.Off;
				PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsActivated)));
			}
		}

		/// <summary> Key of the filter.</summary>
		public string Key { get; }

		/// <summary> State of the filter.</summary>
		public FilterState State { get; private set; }

	}
}