gecko-dev/layout/base/nsChildIterator.cpp

86 lines
3.0 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
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* The Original Code is mozilla.org code.
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*
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/*
* used by nsCSSFrameConstructor to determine and iterate the child list
* used to construct frames (normal children or something from XBL)
*/
#include "nsChildIterator.h"
#include "nsIDocument.h"
#include "nsIBindingManager.h"
nsresult
ChildIterator::Init(nsIContent* aContent,
ChildIterator* aFirst,
ChildIterator* aLast)
{
// Initialize out parameters to be equal, in case of failure.
aFirst->mContent = aLast->mContent = nsnull;
aFirst->mIndex = aLast->mIndex = 0;
NS_PRECONDITION(aContent != nsnull, "no content");
if (! aContent)
return NS_ERROR_NULL_POINTER;
nsCOMPtr<nsIDocument> doc = aContent->GetDocument();
NS_ASSERTION(doc, "element not in the document");
if (! doc)
return NS_ERROR_FAILURE;
// If this node has XBL children, then use them. Otherwise, just use
// the vanilla content APIs.
nsCOMPtr<nsIDOMNodeList> nodes;
doc->BindingManager()->GetXBLChildNodesFor(aContent, getter_AddRefs(nodes));
PRUint32 length;
if (nodes)
nodes->GetLength(&length);
else
length = aContent->GetChildCount();
aFirst->mContent = aContent;
aLast->mContent = aContent;
aFirst->mIndex = 0;
aLast->mIndex = length;
aFirst->mNodes = nodes;
aLast->mNodes = nodes;
return NS_OK;
}