} //CanConvertFrom
/// <summary>
/// Performs the conversion from string to a HtmlFontProperty (only)
/// </summary>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value is string)
{
// define a new font property
string fontString = (string)value;
HtmlFontProperty font = new HtmlFontProperty(string.Empty);;
try
{
// parse the contents of the given string using a regex
string fontName = string.Empty;
string fontSize = string.Empty;
Regex expression = new Regex(FONT_PARSE_EXPRESSION, RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.ExplicitCapture);
Match match = expression.Match(fontString);
// see if a match was found
if (match.Success)
{
// extract the content type elements
fontName = match.Result(FONT_PARSE_NAME);
fontSize = match.Result(FONT_PARSE_SIZE);
// set the fontname
TextInfo text = Thread.CurrentThread.CurrentCulture.TextInfo;
font.Name = text.ToTitleCase(fontName);
// determine size from given string using Small if blank
if (fontSize == string.Empty)
{
fontSize = "Small";
}
font.Size = (HtmlFontSize)Enum.Parse(typeof(HtmlFontSize), fontSize, true);
}
}
catch (Exception)
{
// do nothing but ensure font is a null font
font.Name = string.Empty;
}
if (HtmlFontProperty.IsNull(font))
{
// error performing the string conversion so throw exception given possible format
string error = string.Format(@"Cannot convert '{0}' to Type HtmlFontProperty. Format: 'FontName, HtmlSize', Font Size values: {1}", fontString, string.Join(", ", Enum.GetNames(typeof(HtmlFontSize))));
throw new ArgumentException(error);
}
else
{
// return the font
return(font);
}
}
else
{
return(base.ConvertFrom(context, culture, value));
}
} //ConvertFrom
} //CanConvertTo
/// <summary>
/// Performs the conversion from HtmlFontProperty to a string (only)
/// </summary>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
// ensure working with the intented type HtmlFontProperty
if (value is HtmlFontProperty)
{
HtmlFontProperty font = (HtmlFontProperty)value;
if (destinationType == typeof(string))
{
return(font.ToString());
}
if (destinationType == typeof(InstanceDescriptor))
{
// define array to hold the properties and values
Object[] properties = new Object[8];
Type[] types = new Type[8];
// Name property
properties[0] = font.Name;
types[0] = typeof(string);
// Size property
properties[1] = font.Size;
types[1] = typeof(HtmlFontSize);
// Bold property
properties[2] = font.Bold;
types[2] = typeof(bool);
// Italic property
properties[3] = font.Italic;
types[3] = typeof(bool);
// Underline property
properties[4] = font.Underline;
types[4] = typeof(bool);
// Strikeout property
properties[5] = font.Strikeout;
types[5] = typeof(bool);
// Subscript property
properties[6] = font.Subscript;
types[6] = typeof(bool);
// Superscript property
properties[7] = font.Superscript;
types[7] = typeof(bool);
// create the instance constructor to return
ConstructorInfo ci = typeof(HtmlFontProperty).GetConstructor(types);
return(new InstanceDescriptor(ci, properties));
}
}
// have something other than InstanceDescriptor or sting
return(base.ConvertTo(context, culture, value, destinationType));
} //ConvertTo
} //ToString
/// <summary>
/// Compares two Html Fonts for equality
/// Equality opertors not defined (Design Time issue with override of Equals)
/// </summary>
public static bool IsEqual(HtmlFontProperty font1, HtmlFontProperty font2)
{
// assume not equal
bool equals = false;
// perform the comparsion
if (HtmlFontProperty.IsNotNull(font1) && HtmlFontProperty.IsNotNull(font2))
{
if (font1.Name == font2.Name &&
font1.Size == font2.Size &&
font1.Bold == font2.Bold &&
font1.Italic == font2.Italic &&
font1.Underline == font2.Underline &&
font1.Strikeout == font2.Strikeout &&
font1.Subscript == font2.Subscript &&
font1.Superscript == font2.Superscript)
{
equals = true;
}
}
// return the calculated value
return(equals);
} //IsEquals
} //IsNull
/// <summary>
/// Based on a font name being null the font can be assumed to be null
/// Default constructor will give a null object
/// </summary>
public static bool IsNotNull(HtmlFontProperty font)
{
return(!HtmlFontProperty.IsNull(font));
} //IsNull
} //IsNotEqual
/// <summary>
/// Based on a font name being null the font can be assumed to be null
/// Default constructor will give a null object
/// </summary>
public static bool IsNull(HtmlFontProperty font)
{
return(font.Name == null || font.Name.Trim() == string.Empty);
} //IsNull
} //IsEquals
/// <summary>
/// Compares two Html Fonts for equality
/// Equality opertors not defined (Design Time issue with override of Equals)
/// </summary>
public static bool IsNotEqual(HtmlFontProperty font1, HtmlFontProperty font2)
{
return(!HtmlFontProperty.IsEqual(font1, font2));
} //IsNotEqual