chrome/browser/ui/webui/signin/login_ui_service.h

   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_