/
FontAttributes.cs
50 lines (43 loc) · 1.3 KB
/
FontAttributes.cs
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using System;
namespace Xamarin.Forms
{
[Flags]
[TypeConverter(typeof(FontAttributesConverter))]
public enum FontAttributes
{
None = 0,
Bold = 1 << 0,
Italic = 1 << 1
}
[Xaml.TypeConversion(typeof(FontAttributes))]
public sealed class FontAttributesConverter : TypeConverter
{
public override object ConvertFromInvariantString(string value)
{
if (string.IsNullOrEmpty(value))
return FontAttributes.None;
FontAttributes attributes = FontAttributes.None;
value = value.Trim();
if (value.Contains(",")) { //Xaml
foreach (var part in value.Split(','))
attributes |= ParseSingleAttribute(part, value);
}
else { //CSS or single value
foreach (var part in value.Split(' '))
attributes |= ParseSingleAttribute(part, value);
}
return attributes;
}
static FontAttributes ParseSingleAttribute(string part, string originalvalue)
{
part = part.Trim();
if (Enum.TryParse(part, true, out FontAttributes attr))
return attr;
if (part.Equals("normal", StringComparison.OrdinalIgnoreCase))
return FontAttributes.None;
if (part.Equals("oblique", StringComparison.OrdinalIgnoreCase))
return FontAttributes.Italic;
throw new InvalidOperationException(string.Format("Cannot convert \"{0}\" into {1}", originalvalue, typeof(FontAttributes)));
}
}
}