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/usr/include/lightdm-gobject-1/lightdm/greeter.h is in liblightdm-gobject-dev 1.10.3-3.

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/*
 * Copyright (C) 2010 Robert Ancell.
 * Author: Robert Ancell <robert.ancell@canonical.com>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2 or version 3 of the License.
 * See http://www.gnu.org/copyleft/lgpl.html the full text of the license.
 */

#ifndef LIGHTDM_GREETER_H_
#define LIGHTDM_GREETER_H_

#include <glib-object.h>

G_BEGIN_DECLS

#define LIGHTDM_TYPE_GREETER            (lightdm_greeter_get_type())
#define LIGHTDM_GREETER(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), LIGHTDM_TYPE_GREETER, LightDMGreeter))
#define LIGHTDM_GREETER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), LIGHTDM_TYPE_GREETER, LightDMGreeterClass))
#define LIGHTDM_IS_GREETER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), LIGHTDM_TYPE_GREETER))
#define LIGHTDM_IS_GREETER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), LIGHTDM_TYPE_GREETER))
#define LIGHTDM_GREETER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), LIGHTDM_TYPE_GREETER, LightDMGreeterClass))

/**
 * LightDMPromptType:
 * @LIGHTDM_PROMPT_TYPE_QUESTION: Prompt is a question.  The information can be shown as it is entered.
 * @LIGHTDM_PROMPT_TYPE_SECRET: Prompt is for secret information.  The entered information should be obscured so it can't be publically visible.
 */
typedef enum
{
    LIGHTDM_PROMPT_TYPE_QUESTION,
    LIGHTDM_PROMPT_TYPE_SECRET
} LightDMPromptType;

/**
 * LightDMMessageType:
 * @LIGHTDM_MESSAGE_TYPE_INFO: Informational message.
 * @LIGHTDM_MESSAGE_TYPE_ERROR: Error message.
 */
typedef enum
{
    LIGHTDM_MESSAGE_TYPE_INFO,
    LIGHTDM_MESSAGE_TYPE_ERROR
} LightDMMessageType;

typedef struct
{
    GObject parent_instance;
} LightDMGreeter;

typedef struct
{
    GObjectClass parent_class;

    void (*show_message)(LightDMGreeter *greeter, const gchar *text, LightDMMessageType type);
    void (*show_prompt)(LightDMGreeter *greeter, const gchar *text, LightDMPromptType type);
    void (*authentication_complete)(LightDMGreeter *greeter);
    void (*autologin_timer_expired)(LightDMGreeter *greeter);

    /* Reserved */
    void (*reserved1) (void);
    void (*reserved2) (void);
    void (*reserved3) (void);
    void (*reserved4) (void);
    void (*reserved5) (void);
    void (*reserved6) (void);
} LightDMGreeterClass;

GType lightdm_greeter_get_type (void);

LightDMGreeter *lightdm_greeter_new (void);

gboolean lightdm_greeter_connect_sync (LightDMGreeter *greeter, GError **error);

const gchar *lightdm_greeter_get_hint (LightDMGreeter *greeter, const gchar *name);

const gchar *lightdm_greeter_get_default_session_hint (LightDMGreeter *greeter);

gboolean lightdm_greeter_get_hide_users_hint (LightDMGreeter *greeter);

gboolean lightdm_greeter_get_show_manual_login_hint (LightDMGreeter *greeter);

gboolean lightdm_greeter_get_show_remote_login_hint (LightDMGreeter *greeter);

gboolean lightdm_greeter_get_lock_hint (LightDMGreeter *greeter);

gboolean lightdm_greeter_get_has_guest_account_hint (LightDMGreeter *greeter);

const gchar *lightdm_greeter_get_select_user_hint (LightDMGreeter *greeter);

gboolean lightdm_greeter_get_select_guest_hint (LightDMGreeter *greeter);

const gchar *lightdm_greeter_get_autologin_user_hint (LightDMGreeter *greeter);

gboolean lightdm_greeter_get_autologin_guest_hint (LightDMGreeter *greeter);

gint lightdm_greeter_get_autologin_timeout_hint (LightDMGreeter *greeter);

void lightdm_greeter_cancel_autologin (LightDMGreeter *greeter);

void lightdm_greeter_authenticate (LightDMGreeter *greeter, const gchar *username);

void lightdm_greeter_authenticate_as_guest (LightDMGreeter *greeter);

void lightdm_greeter_authenticate_autologin (LightDMGreeter *greeter);

void lightdm_greeter_authenticate_remote (LightDMGreeter *greeter, const gchar *session, const gchar *username);

void lightdm_greeter_respond (LightDMGreeter *greeter, const gchar *response);

void lightdm_greeter_cancel_authentication (LightDMGreeter *greeter);

gboolean lightdm_greeter_get_in_authentication (LightDMGreeter *greeter);

gboolean lightdm_greeter_get_is_authenticated (LightDMGreeter *greeter);

const gchar *lightdm_greeter_get_authentication_user (LightDMGreeter *greeter);

void lightdm_greeter_set_language (LightDMGreeter *greeter, const gchar *language);

gboolean lightdm_greeter_start_session_sync (LightDMGreeter *greeter, const gchar *session, GError **error);

gchar *lightdm_greeter_ensure_shared_data_dir_sync (LightDMGreeter *greeter, const gchar *username);

G_END_DECLS

#endif /* LIGHTDM_GREETER_H_ */