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// Copyright 2016 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 CHROME_BROWSER_METRICS_TAB_USAGE_RECORDER_H_
#define CHROME_BROWSER_METRICS_TAB_USAGE_RECORDER_H_
#include "base/macros.h"
#include "chrome/browser/metrics/tab_reactivation_tracker.h"
#include "chrome/browser/ui/browser_tab_strip_tracker.h"
#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
namespace metrics {
// This class is used to record metrics about tab reactivation. Specifically,
// it records a histogram value everytime a tab is deactivated or reactivated.
// The ratio of both can be calculated for tabs with different properties (e.g.
// If the tab is pinned to the tab strip) to see if they are correlated with
// higher probability of tab reactivation.
class TabUsageRecorder : public TabReactivationTracker::Delegate,
public TabStripModelObserver {
public:
// Needs to be public for DEFINE_WEB_CONTENTS_USER_DATA_KEY.
class WebContentsData;
// Starts recording tab usage for all browsers.
static void InitializeIfNeeded();
// TabReactivationTracker::Delegate:
void OnTabDeactivated(content::WebContents* contents) override;
void OnTabReactivated(content::WebContents* contents) override;
// TabStripModelObserver:
void TabInsertedAt(TabStripModel* tab_strip_model,
content::WebContents* contents,
int index,
bool foreground) override;
void TabPinnedStateChanged(TabStripModel* tab_strip_model,
content::WebContents* contents,
int index) override;
private:
TabUsageRecorder();
~TabUsageRecorder() override;
// Returns the WebContentsData associated with |contents|, creating one if it
// doesn't exist.
WebContentsData* GetWebContentsData(content::WebContents* contents);
TabReactivationTracker tab_reactivation_tracker_;
BrowserTabStripTracker browser_tab_strip_tracker_;
DISALLOW_COPY_AND_ASSIGN(TabUsageRecorder);
};
} // namespace metrics
#endif // CHROME_BROWSER_METRICS_TAB_USAGE_RECORDER_H_