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// Copyright 2015 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_MEMORY_TAB_MANAGER_WEB_CONTENTS_DATA_H_
#define CHROME_BROWSER_MEMORY_TAB_MANAGER_WEB_CONTENTS_DATA_H_
#include "base/macros.h"
#include "base/time/time.h"
#include "chrome/browser/memory/tab_manager.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
namespace base {
class TickClock;
}
namespace content {
class WebContents;
}
namespace memory {
// Internal class used by TabManager to record the needed data for
// WebContentses.
class TabManager::WebContentsData
: public content::WebContentsObserver,
public content::WebContentsUserData<TabManager::WebContentsData> {
public:
explicit WebContentsData(content::WebContents* web_contents);
~WebContentsData() override;
// WebContentsObserver implementation:
void DidStartLoading() override;
void WebContentsDestroyed() override;
// Returns true if the tab has been discarded to save memory.
bool IsDiscarded();
// Sets/clears the discard state of the tab.
void SetDiscardState(bool state);
// Returns the number of times the tab has been discarded.
int DiscardCount();
// Increments the number of times the tab has been discarded.
void IncrementDiscardCount();
// Returns true if audio has recently been audible.
bool IsRecentlyAudible();
// Set/clears the state of whether audio has recently been audible.
void SetRecentlyAudible(bool state);
// Returns the timestamp of the last time the tab changed its audio state.
base::TimeTicks LastAudioChangeTime();
// Sets the timestamp of the last time the tab changed its audio state.
void SetLastAudioChangeTime(base::TimeTicks timestamp);
// Returns the timestamp of the last time the tab changed became inactive.
base::TimeTicks LastInactiveTime();
// Sets the timestamp of the last time the tab became inactive.
void SetLastInactiveTime(base::TimeTicks timestamp);
// Copies the discard state from |old_contents| to |new_contents|.
static void CopyState(content::WebContents* old_contents,
content::WebContents* new_contents);
// Used to set the test TickClock, which then gets used by NowTicks(). See
// |test_tick_clock_| for more details.
void set_test_tick_clock(base::TickClock* test_tick_clock);
private:
// Needed to access tab_data_.
FRIEND_TEST_ALL_PREFIXES(TabManagerWebContentsDataTest, CopyState);
struct Data {
Data();
bool operator==(const Data& right) const;
bool operator!=(const Data& right) const;
// TODO(georgesak): fix naming (no underscore).
// Is the tab currently discarded?
bool is_discarded_;
// Number of times the tab has been discarded.
int discard_count_;
// Is the tab playing audio?
bool is_recently_audible_;
// Last time the tab started or stopped playing audio (we record the
// transition time).
base::TimeTicks last_audio_change_time_;
// The last time the tab was discarded.
base::TimeTicks last_discard_time_;
// The last time the tab was reloaded after being discarded.
base::TimeTicks last_reload_time_;
// The last time the tab switched from being active to inactive.
base::TimeTicks last_inactive_time_;
// Site Engagement score (set to -1 if not available).
double engagement_score_;
};
// Returns either the system's clock or the test clock. See |test_tick_clock_|
// for more details.
base::TimeTicks NowTicks() const;
// Contains all the needed data for the tab.
Data tab_data_;
// Pointer to a test clock. If this is set, NowTicks() returns the value of
// this test clock. Otherwise it returns the system clock's value.
base::TickClock* test_tick_clock_;
DISALLOW_COPY_AND_ASSIGN(WebContentsData);
};
} // namespace memory
#endif // CHROME_BROWSER_MEMORY_TAB_MANAGER_WEB_CONTENTS_DATA_H_
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