зеркало из https://github.com/mozilla/gecko-dev.git
52 строки
1.5 KiB
C++
52 строки
1.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* used by nsCSSFrameConstructor to determine and iterate the child list
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* used to construct frames (normal children or something from XBL)
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*/
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#include "nsChildIterator.h"
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#include "nsIDocument.h"
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#include "nsBindingManager.h"
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nsresult
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ChildIterator::Init(nsIContent* aContent,
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ChildIterator* aFirst,
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ChildIterator* aLast)
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{
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// Initialize out parameters to be equal, in case of failure.
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aFirst->mContent = aLast->mContent = nullptr;
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aFirst->mChild = aLast->mChild = nullptr;
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NS_PRECONDITION(aContent != nullptr, "no content");
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if (! aContent)
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return NS_ERROR_NULL_POINTER;
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nsIDocument* doc = aContent->OwnerDoc();
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// If this node has XBL children, then use them. Otherwise, just use
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// the vanilla content APIs.
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nsINodeList* nodes = doc->BindingManager()->GetXBLChildNodesFor(aContent);
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aFirst->mContent = aContent;
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aLast->mContent = aContent;
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aFirst->mNodes = nodes;
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aLast->mNodes = nodes;
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if (nodes) {
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uint32_t length;
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nodes->GetLength(&length);
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aFirst->mIndex = 0;
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aLast->mIndex = length;
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} else {
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aFirst->mChild = aContent->GetFirstChild();
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aLast->mChild = nullptr;
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}
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return NS_OK;
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}
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