File: null_window_targeter.h

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// Copyright 2018 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_AURA_NULL_WINDOW_TARGETER_H_
#define UI_AURA_NULL_WINDOW_TARGETER_H_

#include "ui/aura/aura_export.h"
#include "ui/aura/window_targeter.h"

namespace aura {

// NullWindowTargeter can be installed on a root window to prevent it from
// dispatching events such as during shutdown.
class AURA_EXPORT NullWindowTargeter : public WindowTargeter {
 public:
  NullWindowTargeter();

  NullWindowTargeter(const NullWindowTargeter&) = delete;
  NullWindowTargeter& operator=(const NullWindowTargeter&) = delete;

  ~NullWindowTargeter() override;

  // EventTargeter:
  ui::EventTarget* FindTargetForEvent(ui::EventTarget* root,
                                      ui::Event* event) override;
  ui::EventTarget* FindNextBestTarget(ui::EventTarget* previous_target,
                                      ui::Event* event) override;
};

}  // namespace aura

#endif  // UI_AURA_NULL_WINDOW_TARGETER_H_