using System; using System.Globalization; using System.Windows; using System.Windows.Data; namespace ChatController.Converter { public class StringEmptyToVisibilityConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if(value is string text) { return string.IsNullOrWhiteSpace(text) ? Visibility.Visible : Visibility.Hidden; } return Visibility.Visible; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } }