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// 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_SCOPED_PICTURE_IN_PICTURE_OCCLUSION_OBSERVATION_H_
#define CHROME_BROWSER_PICTURE_IN_PICTURE_SCOPED_PICTURE_IN_PICTURE_OCCLUSION_OBSERVATION_H_
#include <memory>
#include "base/functional/callback.h"
#include "base/scoped_observation.h"
#include "ui/views/widget/widget_observer.h"
class PictureInPictureOcclusionObserver;
class PictureInPictureOcclusionTracker;
class PictureInPictureOcclusionTrackerObserver;
// The ScopedPictureInPictureOcclusionObservation observes the
// PictureInPictureOcclusionTracker owned by the PictureInPictureWindowManager.
// It starts observing when `Observe()` is called with a given widget and
// `occlusion_observer_` will be notified of occlusion state updates.
// `occlusion_observer_` is also synchronously notified on the call to
// `Observe()`. The ScopedPictureInPictureOcclusionObservation will stop
// observing for occlusions when EITHER:
// 1) The observed widget is destroyed, OR
// 2) The ScopedPictureInPictureOcclusionObservation itself is destroyed.
//
// See chrome/browser/picture_in_picture/picture_in_picture_occlusion_tracker.h
// for usage examples.
class ScopedPictureInPictureOcclusionObservation
: public views::WidgetObserver {
public:
explicit ScopedPictureInPictureOcclusionObservation(
PictureInPictureOcclusionObserver* occlusion_observer);
ScopedPictureInPictureOcclusionObservation(
const ScopedPictureInPictureOcclusionObservation&) = delete;
ScopedPictureInPictureOcclusionObservation& operator=(
const ScopedPictureInPictureOcclusionObservation&) = delete;
~ScopedPictureInPictureOcclusionObservation() override;
// Starts observing the given `widget` for occlusions. If a widget is already
// being observed, that widget will stop being observed and `widget` will be
// observed instead. `occlusion_observer_` will immediately and synchronously
// be notified of the current occlusion state.
void Observe(views::Widget* widget);
// views::WidgetObserver:
void OnWidgetDestroying(views::Widget* widget) override;
private:
std::unique_ptr<PictureInPictureOcclusionTrackerObserver> observer_;
std::unique_ptr<
base::ScopedObservation<PictureInPictureOcclusionTracker,
PictureInPictureOcclusionTrackerObserver>>
observation_;
base::ScopedObservation<views::Widget, views::WidgetObserver>
widget_observation_{this};
const raw_ptr<PictureInPictureOcclusionObserver> occlusion_observer_;
};
#endif // CHROME_BROWSER_PICTURE_IN_PICTURE_SCOPED_PICTURE_IN_PICTURE_OCCLUSION_OBSERVATION_H_
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