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 aura {
  15 class Window;
  16 }  // namespace aura
  17
  18 namespace content {
  19 class BrowserContext;
  20 }
  21
  22 namespace gfx {
  23 class ImageSkia;
  24 }  // namespace gfx
  25
  26 namespace ash {
  27
  28 class SessionStateObserver;
  29
  30 // The index for the multi-profile item to use. The list is always LRU sorted
  31 // So that the index #0 is the currently active user.
  32 typedef int MultiProfileIndex;
  33
  34 // A list of user_id.
  35 typedef std::vector<std::string> UserIdList;
  36
  37 // Delegate for checking and modifying the session state.
  38 // TODO(oshima): Replace MultiProfileIndex with BrowsreContext, bacause
  39 // GetUserXXX are useful for non multi profile scenario in ash_shell.
  40 class ASH_EXPORT SessionStateDelegate {
  41  public:
  42   // Defines the cycle direction for |CycleActiveUser|.
  43   enum CycleUser {
  44     CYCLE_TO_NEXT_USER = 0,  // Cycle to the next user.
  45     CYCLE_TO_PREVIOUS_USER,  // Cycle to the previous user.
  46   };
  47
  48   virtual ~SessionStateDelegate() {};
  49
  50   // Returns the browser context for the user given by |index|.
  51   virtual content::BrowserContext* GetBrowserContextByIndex(
  52       MultiProfileIndex index) = 0;
  53
  54   // Returns the maximum possible number of logged in users.
  55   virtual int GetMaximumNumberOfLoggedInUsers() const = 0;
  56
  57   // Returns the number of signed in users. If 0 is returned, there is either
  58   // no session in progress or no active user.
  59   virtual int NumberOfLoggedInUsers() const = 0;
  60
  61   // Returns |true| if the session has been fully started for the active user.
  62   // When a user becomes active, the profile and browser UI are not immediately
  63   // available. Only once this method starts returning |true| is the browser
  64   // startup complete and both profile and UI are fully available.
  65   virtual bool IsActiveUserSessionStarted() const = 0;
  66
  67   // Returns true if the screen can be locked.
  68   virtual bool CanLockScreen() const = 0;
  69
  70   // Returns true if the screen is currently locked.
  71   virtual bool IsScreenLocked() const = 0;
  72
  73   // Returns true if the screen should be locked when the system is about to
  74   // suspend.
  75   virtual bool ShouldLockScreenBeforeSuspending() const = 0;
  76
  77   // Locks the screen. The locking happens asynchronously.
  78   virtual void LockScreen() = 0;
  79
  80   // Unlocks the screen.
  81   virtual void UnlockScreen() = 0;
  82
  83   // Returns |true| if user session blocked by some overlying UI. It can be
  84   // login screen, lock screen or screen for adding users into multi-profile
  85   // session.
  86   virtual bool IsUserSessionBlocked() const = 0;
  87
  88   // Gets the displayed name for the user with the given |index|.
  89   // Note that |index| can at maximum be |NumberOfLoggedInUsers() - 1|.
  90   virtual const base::string16 GetUserDisplayName(
  91       MultiProfileIndex index) const = 0;
  92
  93   // Gets the display email address for the user with the given |index|.
  94   // The display email address might contains some periods in the email name
  95   // as well as capitalized letters. For example: "Foo.Bar@mock.com".
  96   // Note that |index| can at maximum be |NumberOfLoggedInUsers() - 1|.
  97   virtual const std::string GetUserEmail(MultiProfileIndex index) const = 0;
  98
  99   // Gets the user id (sanitized email address) for the user with the given
 100   // |index|. The function would return something like "foobar@mock.com".
 101   // Note that |index| can at maximum be |NumberOfLoggedInUsers() - 1|.
 102   virtual const std::string GetUserID(MultiProfileIndex index) const = 0;
 103
 104   // Gets the avatar image for the user associated with the |context|.
 105   virtual const gfx::ImageSkia& GetUserImage(
 106       content::BrowserContext* context) const = 0;
 107
 108   // Whether or not the window's title should show the avatar.
 109   virtual bool ShouldShowAvatar(aura::Window* window) = 0;
 110
 111   // Switches to another active user with |user_id|
 112   // (if that user has already signed in).
 113   virtual void SwitchActiveUser(const std::string& user_id) = 0;
 114
 115   // Switches the active user to the next or previous user, with the same
 116   // ordering as GetLoggedInUsers.
 117   virtual void CycleActiveUser(CycleUser cycle_user) = 0;
 118
 119   // Adds or removes sessions state observer.
 120   virtual void AddSessionStateObserver(SessionStateObserver* observer) = 0;
 121   virtual void RemoveSessionStateObserver(SessionStateObserver* observer) = 0;
 122 };
 123
 124 }  // namespace ash
 125
 126 #endif  // ASH_SESSION_STATE_DELEGATE_H_