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

namespace PDF_Master.DataConvert
{
    public class GroupHeaderConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null || string.IsNullOrEmpty(value.ToString())) return null;
            if (value.ToString().Length == 8)//日期
            {
                string dateStr = value.ToString();
                string text = dateStr.Substring(0, 4) + "-" + dateStr.Substring(4, 2) + "-" + dateStr.Substring(6, 2);
                return text;
            }
            else//页码
            {
                try
                {
                    string page = "Page ";
                    if ((int)value == -1)
                    {
                        return null;
                    }
                    else
                    {
                        return page + ((int)value + 1).ToString();
                    }
                }
                catch
                {
                    return null;
                }
            }
        }

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