ash/session_state_delegate.h

   1 // Copyright (c) 2013 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 ASH_SESSION_STATE_DELEGATE_H_
   6 #define ASH_SESSION_STATE_DELEGATE_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "ash/ash_export.h"
  12 #include "base/strings/string16.h"
  13
  14 namespace gfx {
  15 class ImageSkia;
  16 }  // namespace gfx
  17
  18 namespace ash {
  19
  20 class SessionStateObserver;
  21
  22 // The index for the multi-profile item to use. The list is always LRU sorted
  23 // So that the index #0 is the currently active user.
  24 typedef int MultiProfileIndex;
  25
  26 // A list of user_id.
  27 typedef std::vector<std::string> UserIdList;
  28
  29 // Delegate for checking and modifying the session state.
  30 class ASH_EXPORT SessionStateDelegate {
  31  public:
  32   virtual ~SessionStateDelegate() {};
  33
  34   // Returns the maximum possible number of logged in users.
  35   virtual int GetMaximumNumberOfLoggedInUsers() const = 0;
  36
  37   // Returns the number of signed in users. If 0 is returned, there is either
  38   // no session in progress or no active user.
  39   virtual int NumberOfLoggedInUsers() const = 0;
  40
  41   // Returns |true| if the session has been fully started for the active user.
  42   // When a user becomes active, the profile and browser UI are not immediately
  43   // available. Only once this method starts returning |true| is the browser
  44   // startup complete and both profile and UI are fully available.
  45   virtual bool IsActiveUserSessionStarted() const = 0;
  46
  47   // Returns true if the screen can be locked.
  48   virtual bool CanLockScreen() const = 0;
  49
  50   // Returns true if the screen is currently locked.
  51   virtual bool IsScreenLocked() const = 0;
  52
  53   // Locks the screen. The locking happens asynchronously.
  54   virtual void LockScreen() = 0;
  55
  56   // Unlocks the screen.
  57   virtual void UnlockScreen() = 0;
  58
  59   // Returns |true| if user session blocked by some overlying UI. It can be
  60   // login screen, lock screen or screen for adding users into multi-profile
  61   // session.
  62   virtual bool IsUserSessionBlocked() const = 0;
  63
  64   // Gets the displayed name for the user with the given |index|.
  65   // Note that |index| can at maximum be |NumberOfLoggedInUsers() - 1|.
  66   virtual const base::string16 GetUserDisplayName(
  67       MultiProfileIndex index) const = 0;
  68
  69   // Gets the email address for the user with the given |index|.
  70   // Note that |index| can at maximum be |NumberOfLoggedInUsers() - 1|.
  71   virtual const std::string GetUserEmail(MultiProfileIndex index) const = 0;
  72
  73   // Gets the avatar image for the user with the given |index|.
  74   // Note that |index| can at maximum be |NumberOfLoggedInUsers() - 1|.
  75   virtual const gfx::ImageSkia& GetUserImage(MultiProfileIndex index) const = 0;
  76
  77   // Returns a list of all logged in users.
  78   virtual void GetLoggedInUsers(UserIdList* users) = 0;
  79
  80   // Switches to another active user (if that user has already signed in).
  81   virtual void SwitchActiveUser(const std::string& user_id) = 0;
  82
  83   // Adds or removes sessions state observer.
  84   virtual void AddSessionStateObserver(SessionStateObserver* observer) = 0;
  85   virtual void RemoveSessionStateObserver(SessionStateObserver* observer) = 0;
  86 };
  87
  88 }  // namespace ash
  89
  90 #endif  // ASH_SESSION_STATE_DELEGATE_H_