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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* 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 = nullptr;
aFirst->mChild = aLast->mChild = nullptr;
NS_PRECONDITION(aContent != nullptr, "no content");
if (! aContent)
return NS_ERROR_NULL_POINTER;
nsIDocument* doc = aContent->OwnerDoc();
// 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) {
uint32_t length;
nodes->GetLength(&length);
aFirst->mIndex = 0;
aLast->mIndex = length;
} else {
aFirst->mChild = aContent->GetFirstChild();
aLast->mChild = nullptr;
}
return NS_OK;
}
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