private void RenderUseElement(ISvgElement svgElement)
{
SvgUseElement useElement = (SvgUseElement)svgElement;
int hashCode = 0; // useElement.OuterXml.GetHashCode();
if (!this.BeginUseElement(useElement, out hashCode))
{
return;
}
SvgDocument document = useElement.OwnerDocument;
XmlElement refEl = useElement.ReferencedElement;
if (refEl == null)
{
this.EndUseElement(useElement, hashCode);
return;
}
XmlElement refElParent = refEl.ParentNode as XmlElement;
var siblingNode = refEl.PreviousSibling;
if (siblingNode != null && siblingNode.NodeType == XmlNodeType.Whitespace)
{
siblingNode = siblingNode.PreviousSibling;
}
// For the external node, the documents are different, and we may not be
// able to insert this node, so we first import it...
if (useElement.OwnerDocument != refEl.OwnerDocument)
{
var importedNode = useElement.OwnerDocument.ImportNode(refEl, true) as XmlElement;
if (importedNode != null)
{
var importedSvgElement = importedNode as SvgElement;
if (importedSvgElement != null)
{
importedSvgElement.Imported = true;
importedSvgElement.ImportNode = refEl as SvgElement;
importedSvgElement.ImportDocument = refEl.OwnerDocument as SvgDocument;
}
refEl = importedNode;
}
}
else
{
// For elements/nodes within the same document, clone it.
refEl = (XmlElement)refEl.CloneNode(true);
}
// Reset any ID on the cloned/copied element to avoid duplication of IDs.
// refEl.SetAttribute("id", "");
useElement.OwnerDocument.Static = true;
useElement.CopyToReferencedElement(refEl);
XmlElement refSiblingEl = null;
string useId = null;
// Compensate for the parent's class and sibling css loss from cloning...
if (refElParent != null && refElParent.HasAttribute("class"))
{
var parentClass = refElParent.GetAttribute("class");
if (!string.IsNullOrWhiteSpace(parentClass))
{
var parentEl = document.CreateElement(refElParent.LocalName);
parentEl.SetAttribute("class", parentClass);
parentEl.AppendChild(refEl);
refEl = parentEl;
}
}
else if (refElParent != null && siblingNode != null)
{
var siblingEl = siblingNode as XmlElement;
if (siblingEl != null && siblingEl.HasAttribute("class"))
{
var siblingClass = siblingEl.GetAttribute("class");
if (!string.IsNullOrWhiteSpace(siblingClass))
{
refSiblingEl = (XmlElement)siblingEl.CloneNode(true);
useElement.AppendChild(refSiblingEl);
}
}
}
else
{
//useId = useElement.Id;
//useElement.SetAttribute("id", "");
}
useElement.AppendChild(refEl);
// Now, render the use element...
this.RenderElement(svgElement);
if (refSiblingEl != null)
{
useElement.RemoveChild(refSiblingEl);
}
useElement.RemoveChild(refEl);
useElement.RestoreReferencedElement(refEl);
if (useId != null)
{
useElement.SetAttribute("id", useId);
}
this.EndUseElement(useElement, hashCode);
}