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// Copyright 2021 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_SOURCE_OBSERVER_H_
#define UI_ACCESSIBILITY_AX_TREE_SOURCE_OBSERVER_H_
#include "base/observer_list_types.h"
#include "ui/accessibility/ax_base_export.h"
namespace ui {
template <typename AXNodeSource,
typename AXTreeDataType,
typename AXNodeDataType>
class AXTreeSource;
// This is an interface for a class that observes changes to an `AXTreeSource`.
template <typename AXNodeSource,
typename AXTreeDataType,
typename AXNodeDataType>
class AX_BASE_EXPORT AXTreeSourceObserver : public base::CheckedObserver {
public:
~AXTreeSourceObserver() override = default;
virtual void OnNodeAdded(
const AXTreeSource<AXNodeSource, AXTreeDataType, AXNodeDataType>&
tree_source,
const AXNodeSource& node_source) = 0;
virtual void OnNodeUpdated(
const AXTreeSource<AXNodeSource, AXTreeDataType, AXNodeDataType>&
tree_source,
const AXNodeSource& node_source) = 0;
virtual void OnNodeRemoved(
const AXTreeSource<AXNodeSource, AXTreeDataType, AXNodeDataType>&
tree_source,
const AXNodeSource& node_source) = 0;
};
} // namespace ui
#endif // UI_ACCESSIBILITY_AX_TREE_SOURCE_OBSERVER_H_
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