Shaker/Avalonia/ShakerApp/Convert/MathAddConverter.cs

using Avalonia.Data.Converters;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ShakerApp.Convert
{
    public class MathAddConverter : IValueConverter
    {
        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            // For add this is simple. just return the sum of the value and the parameter.
            // You may want to validate value and parameter in a real world App
            if (value is double v && double.TryParse(parameter!.ToString(), out var val))
            {
                return v + val;
            }
            return 0;
        }

        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            // If we want to convert back, we need to subtract instead of add.
            if (value is double v && double.TryParse(parameter!.ToString(), out var val))
            {
                return v - val;
            }
            return 0;
        }
    }
    public class SubtractionConverter : IValueConverter
    {
        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            // For add this is simple. just return the sum of the value and the parameter.
            // You may want to validate value and parameter in a real world App
            if (value is double v && double.TryParse(parameter!.ToString(), out var val))
            {
                return v - val;
            }
            return 0;
        }

        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            // If we want to convert back, we need to subtract instead of add.
            if (value is double v && double.TryParse(parameter!.ToString(), out var val))
            {
                return v + val;
            }
            return 0;
        }
    }

    public class MultiConverter : IValueConverter
    {
        public static MultiConverter Instance { get; } = new MultiConverter();
        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            if(value is double v && double.TryParse(parameter!.ToString(),out var val))
            {
                return v * val;
            }
            return 0;
        }

        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}