| // 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: |
| // 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 OnTabStripModelChanged( |
| TabStripModel* tab_strip_model, |
| const TabStripModelChange& change, |
| const TabStripSelectionChange& selection) override; |
| void TabPinnedStateChanged(TabStripModel* tab_strip_model, |
| content::WebContents* contents, |
| int index) override; |
| |
| private: |
| class WebContentsData; |
| |
| 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_ |