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

namespace GifResizer.Views.Converter;

public class VisibleWhenNullConverter : IValueConverter
{
    public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        bool invert = parameter?.ToString() == "invert";
        bool isVisible = invert ? value != null : value == null;
        
        return isVisible ? Visibility.Visible : Visibility.Collapsed;
    }

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