ShrlAlgoToolkit/WPFluent/Converters/SliderValueLabelPositionConverter.cs

using System;
using System.Windows.Controls;
using System.Windows.Data;

namespace WPFluent.Converters;

/// <summary>
/// 滑动块标签位置
/// </summary>
[ValueConversion(typeof(double), typeof(double), ParameterType = typeof(Orientation))]
internal class SliderValueLabelPositionConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if(parameter is Orientation orientation && value is double width)
        {
            const double halfGripWidth = 9.0;
            const double margin = 4.0;
            return orientation switch
            {
                Orientation.Horizontal => (-width * 0.5) + halfGripWidth,
                Orientation.Vertical => -width - margin,
                _ => throw new ArgumentOutOfRangeException()
            };
        }

        return 0.0;
    }

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