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

namespace DM_Weight.Converter
{
    public class GroupSumConverter : IValueConverter
    {
        #region 分组组内求和

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var total = 0;
            // DataGrid分组后对应的组及组内元素CollectionViewGroup.Items 类型是ReadOnlyObservableCollection<object>
            if (value is ReadOnlyObservableCollection<object> items)
            {
                foreach (var item in items)
                {
                    var de = item as OrderDetail;
                    total += de.Quantity;
                }
            }
            return "用药总数：" + total;
        }

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

        #endregion

    }
}