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863943dfb7
CLOSED TREE Backed out changeset d66c3f19a210 (bug 1235261) Backed out changeset 467d945426bb (bug 1235261) Backed out changeset 32b61df13142 (bug 1235261) Backed out changeset c50bb8ed4196 (bug 1235261) Backed out changeset 0ff0fa6fe81f (bug 1235261) Backed out changeset df70e89669da (bug 1235261) Backed out changeset 064969357fc9 (bug 1235261)
99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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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#ifndef mozilla_a11y_TreeWalker_h_
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#define mozilla_a11y_TreeWalker_h_
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#include "mozilla/Attributes.h"
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#include <stdint.h>
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#include "mozilla/dom/ChildIterator.h"
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#include "nsCOMPtr.h"
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class nsIContent;
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namespace mozilla {
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namespace a11y {
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class Accessible;
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class DocAccessible;
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/**
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* This class is used to walk the DOM tree to create accessible tree.
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*/
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class TreeWalker final
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{
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public:
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enum {
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// used to walk the existing tree of the given node
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eWalkCache = 1,
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// used to walk the context tree starting from given node
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eWalkContextTree = 2 | eWalkCache
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};
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/**
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* Constructor
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*
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* @param aContext [in] container accessible for the given node, used to
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* define accessible context
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* @param aNode [in] the node the search will be prepared relative to
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* @param aFlags [in] flags (see enum above)
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*/
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TreeWalker(Accessible* aContext, nsIContent* aNode, uint32_t aFlags = 0);
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~TreeWalker();
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/**
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* Return the next child accessible.
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*
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* @note Returned accessible is bound to the document, if the accessible is
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* rejected during tree creation then the caller should be unbind it
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* from the document.
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*/
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Accessible* NextChild();
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private:
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TreeWalker();
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TreeWalker(const TreeWalker&);
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TreeWalker& operator =(const TreeWalker&);
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struct ChildrenIterator {
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ChildrenIterator(nsIContent* aNode, uint32_t aFilter) :
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mDOMIter(aNode, aFilter), mARIAOwnsIdx(0) { }
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dom::AllChildrenIterator mDOMIter;
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uint32_t mARIAOwnsIdx;
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};
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nsIContent* Next(ChildrenIterator* aIter, Accessible** aAccessible = nullptr,
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bool* aSkipSubtree = nullptr);
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/**
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* Create new state for the given node and push it on top of stack.
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*
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* @note State stack is used to navigate up/down the DOM subtree during
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* accessible children search.
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*/
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ChildrenIterator* PushState(nsIContent* aContent)
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{
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return mStateStack.AppendElement(ChildrenIterator(aContent, mChildFilter));
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}
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/**
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* Pop state from stack.
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*/
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ChildrenIterator* PopState();
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DocAccessible* mDoc;
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Accessible* mContext;
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nsIContent* mAnchorNode;
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nsAutoTArray<ChildrenIterator, 20> mStateStack;
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int32_t mChildFilter;
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uint32_t mFlags;
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};
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} // namespace a11y
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} // namespace mozilla
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#endif // mozilla_a11y_TreeWalker_h_
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