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// Copyright 2016 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_METRICS_DESKTOP_SESSION_DURATION_AUDIBLE_CONTENTS_TRACKER_H_
#define CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_AUDIBLE_CONTENTS_TRACKER_H_
#include <set>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "chrome/browser/ui/browser_list_observer.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
namespace metrics {
// BrowserList / TabStripModelObserver used for tracking audio status.
// TODO(chrisha): Migrate this entire thing to use RecentlyAudibleHelper
// notifications rather then TabStripModel notifications.
// https://crbug.com/846374
class AudibleContentsTracker : public BrowserListObserver,
public TabStripModelObserver {
public:
// Interface for an observer of the AudibleContentsTracker. The only client
// of this class is the DesktopSessionDurationTracker, but an observer
// interface has been created for ease of testing.
class Observer {
public:
Observer() = default;
Observer(const Observer&) = delete;
Observer& operator=(const Observer&) = delete;
virtual ~Observer() = default;
// Invoked when a first audio source starts playing after a period of no
// audio sources.
virtual void OnAudioStart() = 0;
// Invoked when all audio sources stop playing.
virtual void OnAudioEnd() = 0;
};
// Creates an audible contents tracker that dispatches its messages to the
// provided |observer|.
explicit AudibleContentsTracker(Observer* observer);
AudibleContentsTracker(const AudibleContentsTracker&) = delete;
AudibleContentsTracker& operator=(const AudibleContentsTracker&) = delete;
~AudibleContentsTracker() override;
private:
// BrowserListObserver:
void OnBrowserAdded(Browser* browser) override;
void OnBrowserRemoved(Browser* browser) override;
// TabStripModelObserver:
void OnTabStripModelChanged(
TabStripModel* tab_strip_model,
const TabStripModelChange& change,
const TabStripSelectionChange& selection) override;
void TabChangedAt(content::WebContents* web_contents,
int index,
TabChangeType change_type) override;
// Used for managing audible_contents_, and invoking OnAudioStart and
// OnAudioEnd callbacks.
void AddAudibleWebContents(content::WebContents* web_contents);
void RemoveAudibleWebContents(content::WebContents* web_contents);
raw_ptr<Observer> observer_;
// The set of WebContents that are currently playing audio.
std::set<raw_ptr<content::WebContents, SetExperimental>> audible_contents_;
};
} // namespace metrics
#endif // CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_AUDIBLE_CONTENTS_TRACKER_H_
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