gecko/layout/base/nsChildIterator.cpp

87 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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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* The Original Code is mozilla.org code.
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* The Initial Developer of the Original Code is
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* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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* Contributor(s):
*
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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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 "nsBindingManager.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->mChild = aLast->mChild = nsnull;
NS_PRECONDITION(aContent != nsnull, "no content");
if (! aContent)
return NS_ERROR_NULL_POINTER;
nsIDocument* doc = aContent->GetOwnerDoc();
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.
nsINodeList* nodes = doc->BindingManager()->GetXBLChildNodesFor(aContent);
aFirst->mContent = aContent;
aLast->mContent = aContent;
aFirst->mNodes = nodes;
aLast->mNodes = nodes;
if (nodes) {
PRUint32 length;
nodes->GetLength(&length);
aFirst->mIndex = 0;
aLast->mIndex = length;
} else {
aFirst->mChild = aContent->GetFirstChild();
aLast->mChild = nsnull;
}
return NS_OK;
}