using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Media;
namespace ApuntaNotas.Utilities
{
/// <summary>
/// This a helper Extension Method that help us transforming a string like #ffffff to a Color instance
/// </summary>
public static class StringToColorExtensionMethod
{
/// <summary>
/// The EM itself that does the job
/// </summary>
/// <param name="colorString">The color string.</param>
/// <returns></returns>
public static Color ToColor(this string colorString)
{
colorString = ExtractHexDigits(colorString);
Color color = Colors.White;
if (colorString.Length == 6)
{
var r = colorString.Substring(0, 2);
var g = colorString.Substring(2, 2);
var b = colorString.Substring(4, 2);
try
{
byte rc = Byte.Parse(r, NumberStyles.HexNumber);
byte gc = Byte.Parse(g, NumberStyles.HexNumber);
byte bc = Byte.Parse(b, NumberStyles.HexNumber);
color = Color.FromRgb(rc, gc, bc);
}
catch (Exception)
{
return Colors.White;
throw;
}
}
if (colorString.Length == 8)
{
var a = colorString.Substring(0, 2);
var r = colorString.Substring(2, 2);
var g = colorString.Substring(4, 2);
var b = colorString.Substring(6, 2);
try
{
byte ac = Byte.Parse(a, NumberStyles.HexNumber);
byte rc = Byte.Parse(r, NumberStyles.HexNumber);
byte gc = Byte.Parse(g, NumberStyles.HexNumber);
byte bc = Byte.Parse(b, NumberStyles.HexNumber);
color = Color.FromArgb(ac, rc, gc, bc);
}
catch (Exception)
{
return Colors.White;
throw;
}
}
return color;
}
/// <summary>
/// Extracts the hex digits from the string.
/// </summary>
/// <param name="colorString">The color string.</param>
/// <returns></returns>
private static string ExtractHexDigits(string colorString)
{
Regex HexDigits = new Regex(@"[abcdefABCDEF\d]+", RegexOptions.Compiled);
var hexnum = new StringBuilder();
foreach (char c in colorString)
if (HexDigits.IsMatch(c.ToString()))
hexnum.Append(c.ToString());
return hexnum.ToString();
}
}
}
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