GPGX.ISettable: output and input hex values

BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.ISettable.cs

@@ -1,4 +1,6 @@
-using System.ComponentModel;
+using System;
+using System.ComponentModel;
+using System.Globalization;
 
 using BizHawk.Common;
 using BizHawk.Emulation.Common;
@@ -34,6 +36,62 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 			return ret;
 		}
 
+		private class UintToHexConverter : TypeConverter
+		{
+			public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
+			{
+				if (sourceType == typeof(string))
+				{
+					return true;
+				}
+				else
+				{
+					return base.CanConvertFrom(context, sourceType);
+				}
+			}
+
+			public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
+			{
+				if (destinationType == typeof(string))
+				{
+					return true;
+				}
+				else
+				{
+					return base.CanConvertTo(context, destinationType);
+				}
+			}
+
+			public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
+			{
+				if (destinationType == typeof(string) && value.GetType() == typeof(uint))
+				{
+					return string.Format("0x{0:x8}", value);
+				}
+				else
+				{
+					return base.ConvertTo(context, culture, value, destinationType);
+				}
+			}			
+
+			public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
+			{
+				if (value.GetType() == typeof(string))
+				{
+					string input = (string)value;
+					if (input.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
+					{
+						input = input.Substring(2);
+					}
+					return uint.Parse(input, NumberStyles.HexNumber, culture);
+				}
+				else
+				{
+					return base.ConvertFrom(context, culture, value);
+				}
+			}
+		}
+
 		private GPGXSyncSettings _syncSettings;
 		private GPGXSettings _settings;
 
@@ -128,7 +186,8 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 			public bool Backdrop { get { return _Backdrop; } set { _Backdrop = value; } }
 
 			[DisplayName("Custom backdrop color")]
-			[Description("Magic pink (0xffff00ff) by default")]
+			[Description("Magic pink by default. Requires core reboot")]
+			[TypeConverter(typeof(UintToHexConverter))]
 			[DefaultValue((uint)0xffff00ff)]
 			public uint BackdropColor { get; set; }