///////////////////////////////////////////////////////////////////////
// Implementation
protected virtual void SetBaseHref(string url)
{
Debug.Assert((url != null) && (url.Length != 0),
"invalid base url");
try {
IHTMLBaseElement baseElem = null;
IHTMLElementCollection allCollection;
IHTMLDOMNode headNode;
// We initialized mshtml using IPersistStreamInit::InitNew, which does not
// create a base element. Check in debug.
#if DEBUG
allCollection = (IHTMLElementCollection)previewDocument.GetAll().Tags("BASE");
if ((allCollection != null) && (allCollection.GetLength() > 0))
{
baseElem = (IHTMLBaseElement)allCollection.Item(0, null);
}
Debug.Assert(baseElem == null,
"did not expect an existing <BASE> element");
baseElem = null;
allCollection = null;
#endif // DEBUG
baseElem = (IHTMLBaseElement)previewDocument.CreateElement("BASE");
if (baseElem != null)
{
allCollection = (IHTMLElementCollection)previewDocument.GetAll().Tags("HEAD");
Debug.Assert((allCollection != null) && (allCollection.GetLength() > 0),
"preview document does not have a HEAD element!");
headNode = (IHTMLDOMNode)allCollection.Item(0, null);
headNode.AppendChild((IHTMLDOMNode)baseElem);
baseElem.SetHref(url);
}
}
catch (Exception e) {
Debug.WriteLineIf(StyleBuilder.StyleBuilderSwitch.TraceVerbose, "Exception caught while setting preview base url:\n\t" + e.ToString());
}
}
