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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_UI_WEBUI_SIGNIN_LOGIN_UI_SERVICE_H_
      6 #define CHROME_BROWSER_UI_WEBUI_SIGNIN_LOGIN_UI_SERVICE_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/observer_list.h"
     10 #include "components/keyed_service/core/keyed_service.h"
     11 
     12 class Browser;
     13 class Profile;
     14 
     15 // The LoginUIService helps track per-profile information for the login UI -
     16 // for example, whether there is login UI currently on-screen.
     17 class LoginUIService : public KeyedService {
     18  public:
     19   // Various UI components implement this API to allow LoginUIService to
     20   // manipulate their associated login UI.
     21   class LoginUI {
     22    public:
     23     // Invoked when the login UI should be brought to the foreground.
     24     virtual void FocusUI() = 0;
     25 
     26     // Invoked when the login UI should be closed. This can be invoked if the
     27     // user takes an action that should display new login UI.
     28     virtual void CloseUI() = 0;
     29    protected:
     30     virtual ~LoginUI() {}
     31   };
     32 
     33   // Interface for obervers of LoginUIService.
     34   class Observer {
     35    public:
     36     // Called when a new login UI is shown.
     37     // |ui| The login UI that was just shown. Will never be null.
     38     virtual void OnLoginUIShown(LoginUI* ui) = 0;
     39 
     40     // Called when a login UI is closed.
     41     // |ui| The login UI that was just closed; will never be null.
     42     virtual void OnLoginUIClosed(LoginUI* ui) = 0;
     43 
     44    protected:
     45     virtual ~Observer() {}
     46   };
     47 
     48   explicit LoginUIService(Profile* profile);
     49   virtual ~LoginUIService();
     50 
     51   // Gets the currently active login UI, or null if no login UI is active.
     52   LoginUI* current_login_ui() const {
     53     return ui_;
     54   }
     55 
     56   // |observer| The observer to add or remove; cannot be NULL.
     57   void AddObserver(Observer* observer);
     58   void RemoveObserver(Observer* observer);
     59 
     60   // Sets the currently active login UI. It is illegal to call this if there is
     61   // already login UI visible.
     62   void SetLoginUI(LoginUI* ui);
     63 
     64   // Called when login UI is closed. If the passed UI is the current login UI,
     65   // sets current_login_ui() to null.
     66   void LoginUIClosed(LoginUI* ui);
     67 
     68   // Delegate to an existing login dialog if one exists.
     69   // If not, we make a new popup dialog window, and set it to
     70   // chrome://signin to ask the user to sign in to chrome.
     71   void ShowLoginPopup();
     72 
     73  private:
     74   // Weak pointer to the currently active login UI, or null if none.
     75   LoginUI* ui_;
     76   Profile* profile_;
     77 
     78   // List of observers.
     79   ObserverList<Observer> observer_list_;
     80 
     81   DISALLOW_COPY_AND_ASSIGN(LoginUIService);
     82 };
     83 
     84 #endif  // CHROME_BROWSER_UI_WEBUI_SIGNIN_LOGIN_UI_SERVICE_H_
     85