private static void ProcessImageTag(XmlNode placeholder, ReferenceElement ie)
{
Debug.Assert(placeholder != null);
Debug.Assert(ie != null);
//向上查找 drawbox
var drawboxNode = placeholder.LookupAncestor(DrawTextBoxElement);
if (drawboxNode.Name != DrawTextBoxElement)
{
throw new TemplateException("The placeholder of image must be in a 'frame'");
}
drawboxNode.ParentNode.ReplaceChild(ie, drawboxNode);
}
private static void ProcessPlaceHolderElement(XmlNode placeholder, ReferenceElement ie)
{
var placeholderType = placeholder.Attributes[TextPlaceholderTypeAttribute]
.InnerText.Trim().ToLowerInvariant();
;
//处理图像占位符
switch (placeholderType)
{
case "image":
ProcessImageTag(placeholder, ie);
break;
case "text":
placeholder.ParentNode.ReplaceChild(ie, placeholder);
break;
default:
throw new SyntaxErrorException("Unsupported placeholder type: " + placeholderType);
}
}
private static void ProcessIdentifierTag(XmlDocument xml, XmlNode placeholder, string value)
{
Debug.Assert(xml != null);
Debug.Assert(placeholder != null);
Debug.Assert(!string.IsNullOrEmpty(value));
var ie = new ReferenceElement(xml, value);
if (placeholder.Name == TextPlaceholderElement)
{
ProcessPlaceHolderElement(placeholder, ie);
}
else
{
placeholder.ParentNode.ReplaceChild(ie, placeholder);
}
}