summaryrefslogtreecommitdiff
path: root/Xamarin.Forms.Core/FontTypeConverter.cs
diff options
context:
space:
mode:
Diffstat (limited to 'Xamarin.Forms.Core/FontTypeConverter.cs')
-rw-r--r--Xamarin.Forms.Core/FontTypeConverter.cs88
1 files changed, 88 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core/FontTypeConverter.cs b/Xamarin.Forms.Core/FontTypeConverter.cs
new file mode 100644
index 00000000..464cf4ab
--- /dev/null
+++ b/Xamarin.Forms.Core/FontTypeConverter.cs
@@ -0,0 +1,88 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+
+namespace Xamarin.Forms
+{
+ public sealed class FontTypeConverter : TypeConverter
+ {
+ public override object ConvertFromInvariantString(string value)
+ {
+ // string should be formatted as "[name],[attributes],[size]" there may be multiple attributes, e.g. "Georgia, Bold, Italic, 42"
+ if (value != null)
+ {
+ // trim because mono implements Enum.Parse incorrectly and fails to trim correctly.
+ List<string> parts = value.Split(',').Select(s => s.Trim()).ToList();
+
+ string name = null;
+ var bold = false;
+ var italic = false;
+ double size = -1;
+ NamedSize namedSize = 0;
+
+ // check if last is a size
+ string last = parts.Last();
+
+ double trySize;
+ NamedSize tryNamedSize;
+ if (double.TryParse(last, NumberStyles.Number, CultureInfo.InvariantCulture, out trySize))
+ {
+ size = trySize;
+ parts.RemoveAt(parts.Count - 1);
+ }
+ else if (Enum.TryParse(last, out tryNamedSize))
+ {
+ namedSize = tryNamedSize;
+ parts.RemoveAt(parts.Count - 1);
+ }
+
+ // check if first is a name
+ foreach (string part in parts)
+ {
+ FontAttributes tryAttibute;
+ if (Enum.TryParse(part, out tryAttibute))
+ {
+ // they did not provide a font name
+ if (tryAttibute == FontAttributes.Bold)
+ bold = true;
+ else if (tryAttibute == FontAttributes.Italic)
+ italic = true;
+ }
+ else
+ {
+ // they may have provided a font name
+ if (name != null)
+ throw new InvalidOperationException(string.Format("Cannot convert \"{0}\" into {1}", value, typeof(Font)));
+
+ name = part;
+ }
+ }
+
+ FontAttributes attributes = 0;
+ if (bold)
+ attributes = attributes | FontAttributes.Bold;
+ if (italic)
+ attributes = attributes | FontAttributes.Italic;
+ if (size == -1 && namedSize == 0)
+ namedSize = NamedSize.Medium;
+
+ if (name != null)
+ {
+ if (size == -1)
+ {
+ return Font.OfSize(name, namedSize).WithAttributes(attributes);
+ }
+ return Font.OfSize(name, size).WithAttributes(attributes);
+ }
+ if (size == -1)
+ {
+ return Font.SystemFontOfSize(namedSize, attributes);
+ }
+ return Font.SystemFontOfSize(size, attributes);
+ }
+
+ throw new InvalidOperationException(string.Format("Cannot convert \"{0}\" into {1}", value, typeof(Font)));
+ }
+ }
+} \ No newline at end of file