sharee.bike-App/Meinkonrad/TINK/View/StringNotNullOrEmptyToVisibleConverter.cs

using System;
using System.Globalization;
using Xamarin.Forms;

namespace TINK.View
{
	/// <summary> Converts a string into visible state. If string is null or empty element becomes invisible.</summary>
	public class StringNotNullOrEmptyToVisibleConverter : IValueConverter
	{
		/// <summary> Converts a string into visible state.</summary>
		/// <param name="value">Text value from view model used to derive whether object is visible or not.</param>
		/// <returns>Boolean value indicating whether object is visible or not.</returns>
		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
		{
			return value != null && value is string text && !string.IsNullOrEmpty(text);
		}

		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
		{
			return "";
		}
	}
}