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// Copyright 2015 The Chromium Authors
// 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 "base/memory/raw_ptr.h"
#include "chrome/browser/ui/browser_list_observer.h"
class BrowserTabStripTrackerDelegate;
class TabStripModelObserver;
// BrowserTabStripTracker attaches a TabStripModelObserver to a subset of
// pre-existing and future Browsers. The subset of Browsers that are tracked is
// determined by an optional BrowserTabStripTrackerDelegate.
//
// This class is typically not the right helper to use. Its primary purpose is
// to hook up a TabStripModelObserver across multiple TabStripModels. As per the
// documentation for TabStripModelObserver, only features that need to interact
// with the tab strip like tab groups and tab search should use
// TabStripModelObserver. Other features should use TabInterface and
// TabFeatures. Furthermore, this class mixes state across multiple
// TabStripModels. This is typically not desirable and instead features should
// hold state on a per-browser-window basis, using BrowserWindowFeatures.
class BrowserTabStripTracker : public BrowserListObserver {
public:
// |tab_strip_model_observer| is a non-nullptr TabStripModelObserver
// registered on tracked Browsers. |delegate| determines which Browsers are
// tracked. If nullptr, all Browsers are tracked.
BrowserTabStripTracker(TabStripModelObserver* tab_strip_model_observer,
BrowserTabStripTrackerDelegate* delegate);
BrowserTabStripTracker(const BrowserTabStripTracker&) = delete;
BrowserTabStripTracker& operator=(const BrowserTabStripTracker&) = delete;
~BrowserTabStripTracker() override;
// Registers the TabStripModelObserver on existing tracked Browsers and starts
// observing Browser creation to register the TabStripModelObserver on future
// tracked Browsers. When the TabStripModelObserver is registered on an
// existing of future Browser, OnTabStripModelChanged() is invoked to indicate
// the initial state of the Browser. 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();
// Returns true if processing an existing Browser in Init().
bool is_processing_initial_browsers() const {
return is_processing_initial_browsers_;
}
private:
// 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;
raw_ptr<TabStripModelObserver> const tab_strip_model_observer_;
raw_ptr<BrowserTabStripTrackerDelegate> const delegate_;
bool is_processing_initial_browsers_;
};
#endif // CHROME_BROWSER_UI_BROWSER_TAB_STRIP_TRACKER_H_
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