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lightning-sunbird  0.9+nobinonly
nsChildIterator.cpp
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00038 
00039 #include "nsChildIterator.h"
00040 #include "nsIDocument.h"
00041 #include "nsIBindingManager.h"
00042 
00043 nsresult
00044 ChildIterator::Init(nsIContent*    aContent,
00045                     ChildIterator* aFirst,
00046                     ChildIterator* aLast)
00047 {
00048   // Initialize out parameters to be equal, in case of failure.
00049   aFirst->mContent = aLast->mContent = nsnull;
00050   aFirst->mIndex   = aLast->mIndex   = 0;
00051   
00052   NS_PRECONDITION(aContent != nsnull, "no content");
00053   if (! aContent)
00054     return NS_ERROR_NULL_POINTER;
00055 
00056   nsCOMPtr<nsIDocument> doc = aContent->GetDocument();
00057   NS_ASSERTION(doc, "element not in the document");
00058   if (! doc)
00059     return NS_ERROR_FAILURE;
00060 
00061   // If this node has XBL children, then use them. Otherwise, just use
00062   // the vanilla content APIs.
00063   nsCOMPtr<nsIDOMNodeList> nodes;
00064   doc->BindingManager()->GetXBLChildNodesFor(aContent, getter_AddRefs(nodes));
00065 
00066   PRUint32 length;
00067   if (nodes)
00068     nodes->GetLength(&length);
00069   else
00070     length = aContent->GetChildCount();
00071 
00072   aFirst->mContent = aContent;
00073   aLast->mContent  = aContent;
00074   aFirst->mIndex   = 0;
00075   aLast->mIndex    = length;
00076   aFirst->mNodes   = nodes;
00077   aLast->mNodes    = nodes;
00078 
00079   return NS_OK;
00080 }