kmpdfkit_demo/Demo/Examples/Compdfkit.Controls/Common/Convert/SubtractionConverter.cs

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

namespace ComPDFKit.Controls.Common 
{
    [ValueConversion(typeof(double), typeof(double))]
    public class SubtractionConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is double actualWidth && parameter is string parameterValue && double.TryParse(parameterValue, out double subtractValue))
            {
                return actualWidth - subtractValue;
            }
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return null;
        }
    }
}