Move implementation of BrowserList onto an inner, instantiatable class, BrowserListImpl.

chrome/browser/ui/browser_list_impl.h

+// Copyright (c) 2012 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_LIST_IMPL_H_
+#define CHROME_BROWSER_UI_BROWSER_LIST_IMPL_H_
+
+#include "base/observer_list.h"
+#include "chrome/browser/ui/host_desktop.h"
+
+class Browser;
+class BrowserList;
+class Profile;
+
+namespace chrome {
+
+class BrowserListObserver;
+
+// Maintains a list of Browser objects present in a given HostDesktop (see
+// HostDesktopType).
+class BrowserListImpl {
+ public:
+  typedef std::vector<Browser*> BrowserVector;
+  typedef BrowserVector::iterator iterator;
+  typedef BrowserVector::const_iterator const_iterator;
+  typedef BrowserVector::const_reverse_iterator const_reverse_iterator;
+
+  static BrowserListImpl* GetInstance(HostDesktopType type);
+
+  // Adds and removes browsers from the global list. The browser object should
+  // be valid BEFORE these calls (for the benefit of observers), so notify and
+  // THEN delete the object.
+  void AddBrowser(Browser* browser);
+  void RemoveBrowser(Browser* browser);
+
+  void AddObserver(BrowserListObserver* observer);
+  void RemoveObserver(BrowserListObserver* observer);
+
+  // Called by Browser objects when their window is activated (focused).  This
+  // allows us to determine what the last active Browser was.
+  void SetLastActive(Browser* browser);
+
+  Browser* GetLastActive();
+
+  // Closes all browsers for |profile|.
+  void CloseAllBrowsersWithProfile(Profile* profile);
+
+  // Browsers are added to the list before they have constructed windows,
+  // so the |window()| member function may return NULL.
+  const_iterator begin();
+  const_iterator end();
+
+  bool empty();

[jam, 2012/07/12 18:53:22]

nit: according to the style guide, these should only be unix_hacker style if
they implementation is inline

+  size_t size();
+
+  // Returns iterated access to list of open browsers ordered by when
+  // they were last active. The underlying data structure is a vector
+  // and we push_back on recent access so a reverse iterator gives the
+  // latest accessed browser first.
+  const_reverse_iterator begin_last_active();

[jam, 2012/07/12 18:53:22]

ditto

+  const_reverse_iterator end_last_active();
+
+  // Returns true if at least one incognito window is open.
+  bool IsIncognitoWindowOpen();
+
+  // Returns true if at least one incognito window is open for |profile|.
+  bool IsIncognitoWindowOpenForProfile(Profile* profile);
+
+ private:
+  BrowserListImpl();
+  ~BrowserListImpl();
+
+  // Helper method to remove a browser instance from a list of browsers
+  void RemoveBrowserFrom(Browser* browser, BrowserVector* browser_list);
+
+  ObserverList<BrowserListObserver> observers_;
+
+  BrowserVector browsers_;
+  BrowserVector last_active_browsers_;
+
+  // Nothing fancy, since we only have two HDTs.
+  static BrowserListImpl* native_instance_;
+  static BrowserListImpl* ash_instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserListImpl);
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_UI_BROWSER_LIST_IMPL_H_