ax_tree_manager.h | Explore in Territory

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_ACCESSIBILITY_AX_TREE_MANAGER_H_
#define UI_ACCESSIBILITY_AX_TREE_MANAGER_H_

#include "base/scoped_observation.h"
#include "ui/accessibility/ax_event_generator.h"
#include "ui/accessibility/ax_export.h"
#include "ui/accessibility/ax_tree.h"
#include "ui/accessibility/ax_tree_observer.h"

namespace ui {

class AXNode;
class AXTreeManagerMap;

// Interface for a class that owns an AXTree and manages its connections
// to other AXTrees in the same page or desktop (parent and child trees)
// as well as a mapping of AXNode's by ID for supporting `GetNodeFromTree`
// and related methods.
//
// Note, the tree manager may be created for a tree which has unknown (not
// valid) tree id. A such tree is not registered with the tree map and thus
// cannot be retrieved from the map. When the tree gets data and tree id, then
// it is registered in the map automatically (see OnTreeDataChanged callback
// notification). The mechanism implements the tree id data integrirty between
// the tree map and trees, also it doesn't allow to register two different trees
// with unknown IDs.
class AX_EXPORT AXTreeManager : public AXTreeObserver { … };

}  // namespace ui

#endif  // UI_ACCESSIBILITY_AX_TREE_MANAGER_H_
chromium/ui/accessibility/ax_tree_manager.h
