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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_UI_BROWSER_TAB_STRIP_TRACKER_H_
#define CHROME_BROWSER_UI_BROWSER_TAB_STRIP_TRACKER_H_
#include <set>
#include "base/macros.h"
#include "chrome/browser/ui/browser_list_observer.h"
class BrowserTabStripTrackerDelegate;
class TabStripModelObserver;
// BrowserTabStripTracker is useful when you want to attach a
// TabStripModelObserver to a subset of the available browsers, as well as
// tracking new Browsers as they are added.
//
// To constrain the set of Browsers to track use a
// BrowserTabStripTrackerDelegate. BrowserTabStripTracker queries the delegate
// for each Browser to determine if the Browser should be tracked. A null
// delegate indicates all Browsers should be observed.
//
// If you are interested in BrowserListObserver functions specify a
// BrowserListObserver in the constructor. OnBrowserAdded() and
// OnBrowserRemoved() are only called if the delegate indicates the browser
// should be tracked.
class BrowserTabStripTracker : public chrome::BrowserListObserver {
public:
// See Init() for details.
enum class InitWith {
BROWSERS_IN_ACTIVE_DESKTOP,
ALL_BROWERS,
};
// See class description for details. You only need specify a
// TabStripModelObserver. |delegate| and |browser_list_observer| are
// optional.
BrowserTabStripTracker(TabStripModelObserver* tab_strip_model_observer,
BrowserTabStripTrackerDelegate* delegate,
BrowserListObserver* browser_list_observer);
~BrowserTabStripTracker() override;
// Starts tracking BrowserList for changes and additionally observes the
// existing Browsers matching |init_with|. If there is a
// BrowserTabStripTrackerDelegate it is called to determine if the Browser
// should be observed. If an existing Browser should be observed
// TabInsertedAt() is called for any existing tabs. If a delegate needs to
// differentiate between Browsers observed by way of Init() vs. a Browser
// added after the fact use is_processing_initial_browsers().
void Init(InitWith init_with);
// Returns true if processing an existing Browser in Init().
bool is_processing_initial_browsers() const {
return is_processing_initial_browsers_;
}
// Stops observing the current set of observed browsers and calls
// BrowserListObserver::OnBrowserRemoved().
void StopObservingAndSendOnBrowserRemoved();
private:
using Browsers = std::set<Browser*>;
// Returns true if a TabStripModelObserver should be added to |browser|.
bool ShouldTrackBrowser(Browser* browser);
// If ShouldTrackBrowser() returns true for |browser| then a
// TabStripModelObserver is attached.
void MaybeTrackBrowser(Browser* browser);
// BrowserListObserver:
void OnBrowserAdded(Browser* browser) override;
void OnBrowserRemoved(Browser* browser) override;
void OnBrowserSetLastActive(Browser* browser) override;
TabStripModelObserver* tab_strip_model_observer_;
BrowserTabStripTrackerDelegate* delegate_;
BrowserListObserver* browser_list_observer_;
bool is_processing_initial_browsers_;
Browsers browsers_observing_;
DISALLOW_COPY_AND_ASSIGN(BrowserTabStripTracker);
};
#endif // CHROME_BROWSER_UI_BROWSER_TAB_STRIP_TRACKER_H_
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