sharee.bike-App/ShareeSharedGuiLib/ViewModel/BarLevelViewModel.cs

using System.ComponentModel;
using TINK.MultilingualResources;

namespace ShareeSharedGuiLib.ViewModel
{
    /// <summary>
    /// Bar based filling level indicator view.
    /// </summary>
    public class BarLevelViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public int? _Maximum = null;

        /// <summary>
        /// Holds the maximum count of bars.
        /// </summary>
        public int? Maximum
        {
            get => _Maximum;
            set
            {
                if (_Maximum == value)
                {
                    // Nothing to do because nothing changed.
                    return;
                }

                _Maximum = value;
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsBatteryChargeLevelLabelVisible)));
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(BatteryChargeLevelBarsText)));
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(BatteryChargeLevelImageSourceString)));
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsBatteryChargeLevelImageVisible)));
            }
        }

        public int? _Current = null;

        /// <summary>
        /// Holds the current count of bars.
        /// </summary>
        public int? Current
        {
            get => _Current;
            set
            {
                if (_Current == value)
                {
                    // Nothing to do because nothing changed.
                    return;
                }

                _Current = value;
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsBatteryChargeLevelLabelVisible)));
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(BatteryChargeLevelBarsText)));
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(BatteryChargeLevelImageSourceString)));
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsBatteryChargeLevelImageVisible)));
            }
        }

        /// <summary>
        /// Gets the battery filling level or pedelecs.
        /// </summary>
        public string BatteryChargeLevelBarsText => Maximum != null
            ? string.Format(
                AppResources.MarkingDriveBatteryChargingLevel,
                Current != null ? Current.ToString() : "-",
                Maximum != null ? Maximum.ToString() : "-")
            : AppResources.MarkingDriveBatteryChargingLevelNotAvailable;

        /// <summary>
        /// Gets a value indicating whether battery label is visible or not.
        /// </summary>
        public bool IsBatteryChargeLevelLabelVisible => Maximum.HasValue && Maximum.Value != 5;

        /// <summary>
        /// Gets name of battery image ressource.
        /// </summary>
        public string BatteryChargeLevelImageSourceString => Current.HasValue && Maximum.HasValue && Maximum.Value == 5
            ? $"battery_{Current.Value}_{Maximum.Value}.png"
            : "battery_undefined.png";

        /// <summary>
        /// Gets a value indicating whether battery image is visible or not.
        /// </summary>
        public bool IsBatteryChargeLevelImageVisible => Maximum.HasValue && Maximum.Value == 5;

    }
}