BeWoPlaner/BeWo/Converter/IsLastItemToBoolMultiConverter.cs

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

namespace BeWo.Converter
{
    /// <summary>
    /// Erwartet: [0] = Item, [1] = ItemsControl, [2] = Items.Count (nur als Aktualisierungs-Trigger).
    /// Liefert true, wenn das Item das letzte Element im ItemsControl ist.
    /// </summary>
    public class IsLastItemToBoolMultiConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            try
            {
                if (values is null || values.Length < 2)
                    return false;

                if (!(values[1] is ItemsControl itemsControl))
                    return false;

                var items = itemsControl.Items;

                return items.Count > 0 && ReferenceEquals(items[items.Count - 1], values[0]);
            }
            catch (Exception)
            {
                return false;
            }
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}