Emilio Cobos Álvarez
24211cd4e2
Autogenerated with:
cp dom/.clang-format accessible/ && mach format accessible/**.{cpp,h,mm}
Manual fixes:
* Atk individual includes need to become atk/atk.h because otherwise some symbols incorrectly get hidden visibility.
Differential Revision: https://phabricator.services.mozilla.com/D311692
142 lines
3.8 KiB
C++
142 lines
3.8 KiB
C++
/* 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 <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 LocalAccessible;
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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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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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eScoped = 4
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};
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/**
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* Used to navigate and create if needed the accessible children.
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*/
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explicit TreeWalker(LocalAccessible* aContext);
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/**
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* Used to navigate the accessible children relative to the anchor.
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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 aAnchorNode [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(LocalAccessible* aContext, nsIContent* aAnchorNode,
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uint32_t aFlags = eWalkCache);
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/**
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* Navigates the accessible children within the anchor node subtree.
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*/
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TreeWalker(DocAccessible* aDocument, nsIContent* aAnchorNode);
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~TreeWalker();
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TreeWalker() = delete;
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TreeWalker(const TreeWalker&) = delete;
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TreeWalker& operator=(const TreeWalker&) = delete;
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/**
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* Resets the walker state, and sets the given node as an anchor. Returns a
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* first accessible element within the node including the node itself.
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*/
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LocalAccessible* Scope(nsIContent* aAnchorNode);
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/**
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* Resets the walker state.
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*/
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void Reset() {
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mPhase = eAtStart;
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mStateStack.Clear();
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mARIAOwnsIdx = 0;
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}
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/**
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* Sets the walker state to the given child node if it's within the anchor.
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*/
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bool Seek(nsIContent* aChildNode);
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/**
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* Return the next/prev 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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LocalAccessible* Next();
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LocalAccessible* Prev();
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LocalAccessible* Context() const { return mContext; }
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DocAccessible* Document() const { return mDoc; }
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private:
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/**
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* Return an accessible for the given node if any.
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*/
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LocalAccessible* AccessibleFor(nsIContent* aNode, uint32_t aFlags,
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bool* aSkipSubtree);
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/**
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* Create new state for the given node and push it on top of stack / at bottom
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* 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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dom::AllChildrenIterator* PushState(nsIContent* aContent,
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bool aStartAtBeginning) {
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return mStateStack.AppendElement(
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dom::AllChildrenIterator(aContent, mChildFilter, aStartAtBeginning));
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}
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dom::AllChildrenIterator* PrependState(nsIContent* aContent,
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bool aStartAtBeginning) {
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return mStateStack.InsertElementAt(
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0, dom::AllChildrenIterator(aContent, mChildFilter, aStartAtBeginning));
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}
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/**
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* Pop state from stack.
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*/
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dom::AllChildrenIterator* PopState();
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DocAccessible* mDoc;
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LocalAccessible* mContext;
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nsIContent* mAnchorNode;
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AutoTArray<dom::AllChildrenIterator, 20> mStateStack;
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uint32_t mARIAOwnsIdx;
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int32_t mChildFilter;
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uint32_t mFlags;
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enum Phase { eAtStart, eAtDOM, eAtARIAOwns, eAtEnd };
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Phase mPhase;
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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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