chromium/chrome/browser/picture_in_picture/picture_in_picture_occlusion_tracker_observer.h

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_PICTURE_IN_PICTURE_PICTURE_IN_PICTURE_OCCLUSION_TRACKER_OBSERVER_H_
#define CHROME_BROWSER_PICTURE_IN_PICTURE_PICTURE_IN_PICTURE_OCCLUSION_TRACKER_OBSERVER_H_

#include "base/observer_list_types.h"

namespace views {
class Widget;
}  // namespace views

class PictureInPictureOcclusionObserver;

// The PictureInPictureOcclusionTrackerObserver is a base::CheckedObserver that
// associates a PictureInPictureOcclusionObserver with its observed
// views::Widget. Observers should not subclass
// PictureInPictureOcclusionTrackerObserver directly, but instead should
// subclass PictureInPictureOcclusionObserver and use a
// ScopedPictureInPictureOcclusionObservation to observe the
// PictureInPictureOcclusionTracker.
//
// See chrome/browser/picture_in_picture/picture_in_picture_occlusion_tracker.h
// for usage examples.
class PictureInPictureOcclusionTrackerObserver final
    : public base::CheckedObserver { … };

#endif  // CHROME_BROWSER_PICTURE_IN_PICTURE_PICTURE_IN_PICTURE_OCCLUSION_TRACKER_OBSERVER_H_