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tab_reactivation_tracker.h
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tab_reactivation_tracker.h
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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_REACTIVATION_TRACKER_H_
#define CHROME_BROWSER_METRICS_TAB_REACTIVATION_TRACKER_H_
#include <memory>
#include <unordered_map>
#include "base/macros.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 track tab deactivation/reactivation cycle. A
// reactivation is defined as a tab that was hidden and then reshown.
//
// Note: A closing tab will not trigger a tab deactivation. Also worth noting
// that tab discarding disrupts the tracking and the discarded tab will be
// treated as a new tab.
class TabReactivationTracker : public TabStripModelObserver {
public:
class Delegate {
public:
virtual void OnTabDeactivated(content::WebContents* contents) = 0;
virtual void OnTabReactivated(content::WebContents* contents) = 0;
};
explicit TabReactivationTracker(Delegate* delegate);
~TabReactivationTracker() override;
// TabStripModelObserver:
void OnTabStripModelChanged(
TabStripModel* tab_strip_model,
const TabStripModelChange& change,
const TabStripSelectionChange& selection) override;
void NotifyTabDeactivating(content::WebContents* contents);
void NotifyTabReactivating(content::WebContents* contents);
private:
class WebContentsHelper;
// Returns the helper for the |contents|, creating it if it doesn't exist.
WebContentsHelper* GetHelper(content::WebContents* contents);
// Called by the helper when |contents| is being destroyed.
void OnWebContentsDestroyed(content::WebContents* contents);
// The delegate must outlive this class.
Delegate* delegate_;
// A helper instance is managed per WebContents.
std::unordered_map<content::WebContents*, std::unique_ptr<WebContentsHelper>>
helper_map_;
BrowserTabStripTracker browser_tab_strip_tracker_;
DISALLOW_COPY_AND_ASSIGN(TabReactivationTracker);
};
} // namespace metrics
#endif // CHROME_BROWSER_METRICS_TAB_REACTIVATION_TRACKER_H_