public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null || (double)value < 0)
return 0;
var width = (double)value;
var label = (Label)parameter;
var height = DependencyService.Get<ITextMeter>().MeasureTextSize(label.Text, width, label.FontSize, label.FontFamily);
return height;
}