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// Copyright (c) 2013 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 ASH_SESSION_STATE_DELEGATE_H_
#define ASH_SESSION_STATE_DELEGATE_H_
#include <string>
#include <vector>
#include "ash/ash_export.h"
#include "base/strings/string16.h"
namespace gfx {
class ImageSkia;
} // namespace gfx
namespace ash {
class SessionStateObserver;
// The index for the multi-profile item to use. The list is always LRU sorted
// So that the index #0 is the currently active user.
typedef int MultiProfileIndex;
// A list of user_id.
typedef std::vector<std::string> UserIdList;
// Delegate for checking and modifying the session state.
class ASH_EXPORT SessionStateDelegate {
public:
virtual ~SessionStateDelegate() {};
// Returns the maximum possible number of logged in users.
virtual int GetMaximumNumberOfLoggedInUsers() const = 0;
// Returns the number of signed in users. If 0 is returned, there is either
// no session in progress or no active user.
virtual int NumberOfLoggedInUsers() const = 0;
// Returns |true| if the session has been fully started for the active user.
// When a user becomes active, the profile and browser UI are not immediately
// available. Only once this method starts returning |true| is the browser
// startup complete and both profile and UI are fully available.
virtual bool IsActiveUserSessionStarted() const = 0;
// Returns true if the screen can be locked.
virtual bool CanLockScreen() const = 0;
// Returns true if the screen is currently locked.
virtual bool IsScreenLocked() const = 0;
// Locks the screen. The locking happens asynchronously.
virtual void LockScreen() = 0;
// Unlocks the screen.
virtual void UnlockScreen() = 0;
// Returns |true| if user session blocked by some overlying UI. It can be
// login screen, lock screen or screen for adding users into multi-profile
// session.
virtual bool IsUserSessionBlocked() const = 0;
// Gets the displayed name for the user with the given |index|.
// Note that |index| can at maximum be |NumberOfLoggedInUsers() - 1|.
virtual const base::string16 GetUserDisplayName(
MultiProfileIndex index) const = 0;
// Gets the email address for the user with the given |index|.
// Note that |index| can at maximum be |NumberOfLoggedInUsers() - 1|.
virtual const std::string GetUserEmail(MultiProfileIndex index) const = 0;
// Gets the avatar image for the user with the given |index|.
// Note that |index| can at maximum be |NumberOfLoggedInUsers() - 1|.
virtual const gfx::ImageSkia& GetUserImage(MultiProfileIndex index) const = 0;
// Returns a list of all logged in users.
virtual void GetLoggedInUsers(UserIdList* users) = 0;
// Switches to another active user using the |user_email|
// (if that user has already signed in).
virtual void SwitchActiveUser(const std::string& user_email) = 0;
// Adds or removes sessions state observer.
virtual void AddSessionStateObserver(SessionStateObserver* observer) = 0;
virtual void RemoveSessionStateObserver(SessionStateObserver* observer) = 0;
};
} // namespace ash
#endif // ASH_SESSION_STATE_DELEGATE_H_
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