maui-linux/Xamarin.Forms.Core/FontSizeConverter.cs

48 строки
1.7 KiB
C#

using System;
using System.Globalization;
using Xamarin.Forms.Xaml;
namespace Xamarin.Forms
{
public class FontSizeConverter : TypeConverter, IExtendedTypeConverter
{
[Obsolete("use ConvertFromInvariantString (string, IServiceProvider)")]
object IExtendedTypeConverter.ConvertFrom(CultureInfo culture, object value, IServiceProvider serviceProvider)
{
return ((IExtendedTypeConverter)this).ConvertFromInvariantString(value as string, serviceProvider);
}
object IExtendedTypeConverter.ConvertFromInvariantString(string value, IServiceProvider serviceProvider)
{
if (value != null)
{
double size;
if (double.TryParse(value, NumberStyles.Number, CultureInfo.InvariantCulture, out size))
return size;
NamedSize namedSize;
if (Enum.TryParse(value, out namedSize))
{
Type type;
var valueTargetProvider = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
type = valueTargetProvider != null ? valueTargetProvider.TargetObject.GetType() : typeof(Label);
return Device.GetNamedSize(namedSize, type, false);
}
}
throw new InvalidOperationException(string.Format("Cannot convert \"{0}\" into {1}", value, typeof(double)));
}
public override object ConvertFromInvariantString(string value)
{
if (value != null)
{
double size;
if (double.TryParse(value, NumberStyles.Number, CultureInfo.InvariantCulture, out size))
return size;
NamedSize namedSize;
if (Enum.TryParse(value, out namedSize))
return Device.GetNamedSize(namedSize, typeof(Label), false);
}
throw new InvalidOperationException(string.Format("Cannot convert \"{0}\" into {1}", value, typeof(double)));
}
}
}