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

namespace XP.Hardware.PLC.Sentry.Converters
{
    /// <summary>
    /// 将 null 或空字符串转换为 Collapsed，非空字符串转换为 Visible | Converts null/empty string to Collapsed, non-empty to Visible
    /// </summary>
    public class NullOrEmptyToVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return string.IsNullOrEmpty(value as string) ? Visibility.Collapsed : Visibility.Visible;
        }

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