CentralizedControl/HandyControl/HandyControl_Shared/Tools/Converter/TreeViewItemMarginConverter.cs

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

namespace HandyControl.Tools.Converter;

public class TreeViewItemMarginConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        var left = 0.0;
        UIElement element = value as TreeViewItem;
        while (element != null && element.GetType() != typeof(TreeView))
        {
            element = (UIElement) VisualTreeHelper.GetParent(element);
            if (element is TreeViewItem)
                left += 19.0;
        }
        return new Thickness(left, 0, 0, 0);
    }
    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}