/// <summary>
/// Here we perform the actual convertion from OpenXML color to ClosedXML color.
/// </summary>
/// <param name="openXMLColor">OpenXML color. Must be either <see cref="ColorType"/> or <see cref="X14.ColorType"/>.
/// Since these types do not implement a common interface we use dynamic.</param>
/// <param name="colorCache">The dictionary containing parsed colors to optimize performance.</param>
/// <returns>The color in ClosedXML format.</returns>
private static XLColor ConvertToClosedXMLColor(IColorTypeAdapter openXMLColor, IDictionary <string, Drawing.Color> colorCache)
{
XLColor retVal = null;
if (openXMLColor != null)
{
if (openXMLColor.Rgb != null)
{
String htmlColor = "#" + openXMLColor.Rgb.Value;
if (colorCache == null || !colorCache.TryGetValue(htmlColor, out Drawing.Color thisColor))
{
thisColor = ColorStringParser.ParseFromHtml(htmlColor);
colorCache?.Add(htmlColor, thisColor);
}
retVal = XLColor.FromColor(thisColor);
}
else if (openXMLColor.Indexed != null && openXMLColor.Indexed <= 64)
{
retVal = XLColor.FromIndex((Int32)openXMLColor.Indexed.Value);
}
else if (openXMLColor.Theme != null)
{
retVal = openXMLColor.Tint != null
? XLColor.FromTheme((XLThemeColor)openXMLColor.Theme.Value, openXMLColor.Tint.Value)
: XLColor.FromTheme((XLThemeColor)openXMLColor.Theme.Value);
}
}
return(retVal ?? XLColor.NoColor);
}
/// <summary>
/// Initialize properties of the existing instance of the color in OpenXML format basing on properties of the color
/// in ClosedXML format.
/// </summary>
/// <param name="openXMLColor">OpenXML color. Must be either <see cref="ColorType"/> or <see cref="X14.ColorType"/>.
/// Since these types do not implement a common interface we use dynamic.</param>
/// <param name="xlColor">Color in ClosedXML format.</param>
/// <param name="isDifferential">Flag specifiying that the color should be saved in
/// differential format (affects the transparent color processing).</param>
private static void FillFromClosedXMLColor(IColorTypeAdapter openXMLColor, XLColor xlColor, bool isDifferential)
{
if (openXMLColor == null)
{
throw new ArgumentNullException(nameof(openXMLColor));
}
if (xlColor == null)
{
throw new ArgumentNullException(nameof(xlColor));
}
switch (xlColor.ColorType)
{
case XLColorType.Color:
openXMLColor.Rgb = xlColor.Color.ToHex();
break;
case XLColorType.Indexed:
// 64 is 'transparent' and should be ignored for differential formats
if (!isDifferential || xlColor.Indexed != 64)
{
openXMLColor.Indexed = (UInt32)xlColor.Indexed;
}
break;
case XLColorType.Theme:
openXMLColor.Theme = (UInt32)xlColor.ThemeColor;
if (xlColor.ThemeTint != 0)
{
openXMLColor.Tint = xlColor.ThemeTint;
}
break;
}
}
