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