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// Copyright 2019 The Chromium Authors. All rights reserved.
// 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 "ui/accessibility/ax_export.h"
#include "ui/accessibility/ax_node.h"
#include "ui/accessibility/ax_tree_id.h"
#include "ui/accessibility/ax_tree_observer.h"
namespace ui {
// Abstract 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).
class AX_EXPORT AXTreeManager {
public:
// Returns the AXNode with the given |node_id| from the tree that has the
// given |tree_id|. This allows for callers to access nodes outside of their
// own tree. Returns nullptr if |tree_id| or |node_id| is not found.
virtual AXNode* GetNodeFromTree(const AXTreeID tree_id,
const AXNodeID node_id) const = 0;
// Returns the AXNode in the current tree that has the given |node_id|.
// Returns nullptr if |node_id| is not found.
virtual AXNode* GetNodeFromTree(const AXNodeID node_id) const = 0;
// Use `AddObserver` and `RemoveObserver` when you want to be notified when
// changes happen to an `XTree`
virtual void AddObserver(AXTreeObserver* observer) {}
virtual void RemoveObserver(AXTreeObserver* observer) {}
// Returns the tree id of the tree managed by this AXTreeManager.
virtual AXTreeID GetTreeID() const = 0;
// Returns the tree id of the parent tree.
// Returns AXTreeIDUnknown if this tree doesn't have a parent tree.
virtual AXTreeID GetParentTreeID() const = 0;
// Returns the AXNode that is at the root of the current tree.
virtual AXNode* GetRootAsAXNode() const = 0;
// If this tree has a parent tree, returns the node in the parent tree that
// hosts the current tree. Returns nullptr if this tree doesn't have a parent
// tree.
virtual AXNode* GetParentNodeFromParentTreeAsAXNode() const = 0;
// Called when the tree manager is about to be removed from the tree map,
// `AXTreeManagerMap`.
virtual void WillBeRemovedFromMap() {}
};
} // namespace ui
#endif // UI_ACCESSIBILITY_AX_TREE_MANAGER_H_
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