path: root/shell/e-shell-backend.h

/*
 * e-shell-backend.h
 *
 * This program 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 of the License, or (at your option) version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifndef E_SHELL_BACKEND_H
#define E_SHELL_BACKEND_H

#include <libebackend/libebackend.h>

#include <shell/e-shell-common.h>
#include <e-util/e-util.h>

/* Standard GObject macros */
#define E_TYPE_SHELL_BACKEND \
    (e_shell_backend_get_type ())
#define E_SHELL_BACKEND(obj) \
    (G_TYPE_CHECK_INSTANCE_CAST \
    ((obj), E_TYPE_SHELL_BACKEND, EShellBackend))
#define E_SHELL_BACKEND_CLASS(cls) \
    (G_TYPE_CHECK_CLASS_CAST \
    ((cls), E_TYPE_SHELL_BACKEND, EShellBackendClass))
#define E_IS_SHELL_BACKEND(obj) \
    (G_TYPE_CHECK_INSTANCE_TYPE \
    ((obj), E_TYPE_SHELL_BACKEND))
#define E_IS_SHELL_BACKEND_CLASS(cls) \
    (G_TYPE_CHECK_CLASS_TYPE \
    ((cls), E_TYPE_SHELL_BACKEND))
#define E_SHELL_BACKEND_GET_CLASS(obj) \
    (G_TYPE_INSTANCE_GET_CLASS \
    ((obj), E_TYPE_SHELL_BACKEND, EShellBackendClass))

G_BEGIN_DECLS

/* Avoid including <e-shell.h>, because it includes us! */
struct _EShell;

typedef struct _EShellBackend EShellBackend;
typedef struct _EShellBackendClass EShellBackendClass;
typedef struct _EShellBackendPrivate EShellBackendPrivate;

/**
 * EShellBackend:
 *
 * Contains only private data that should be read and manipulated using the
 * functions below.
 **/
struct _EShellBackend {
    EExtension parent;
    EShellBackendPrivate *priv;
};

/**
 * EShellBackendClass:
 * @parent_class:   The parent class structure.
 * @name:       The name of the backend.  Also becomes the name of
 *          the corresponding #EShellView subclass that the
 *          backend will register.
 * @aliases:        Colon-separated list of aliases that can be used
 *          when referring to a backend by name.
 * @schemes:        Colon-separated list of URI schemes.  The #EShell
 *          will forward command-line URIs to the appropriate
 *          backend based on this list.
 * @sort_order:     Used to determine the order of backends listed in
 *          the main menu and in the switcher.  See
 *          e_shell_backend_compare().
 * @shell_view_type:    #GType for the corresponding #EShellView subclass.
 * @start:      Method for notifying the backend to begin loading
 *          data and running background tasks.  This is called
 *          just before the first instantiation of the
 *          corresponding #EShellView subclass.  It allows the
 *          backend to delay initialization steps that consume
 *          significant resources until they are actually needed.
 * @migrate:        Method for notifying the backend to migrate data and
 *          settings from the given version.  Returns %TRUE if the
 *          migration was successful or if no action was necessary.
 *          Returns %FALSE and sets a #GError if the migration
 *          failed.
 *
 * #EShellBackendClass contains a number of important settings for subclasses.
 **/
struct _EShellBackendClass {
    EExtensionClass parent_class;

    GType shell_view_type;

    const gchar *name;
    const gchar *aliases;
    const gchar *schemes;
    gint sort_order;
    const gchar *preferences_page;

    /* Methods */
    void        (*start)        (EShellBackend *shell_backend);
    gboolean    (*migrate)      (EShellBackend *shell_backend,
                         gint major,
                         gint minor,
                         gint micro,
                         GError **error);
    const gchar *   (*get_config_dir)   (EShellBackend *shell_backend);
    const gchar *   (*get_data_dir)     (EShellBackend *shell_backend);
};

GType       e_shell_backend_get_type    (void);
gint        e_shell_backend_compare     (EShellBackend *shell_backend_a,
                         EShellBackend *shell_backend_b);
const gchar *   e_shell_backend_get_config_dir  (EShellBackend *shell_backend);
const gchar *   e_shell_backend_get_data_dir    (EShellBackend *shell_backend);
struct _EShell *e_shell_backend_get_shell   (EShellBackend *shell_backend);
void        e_shell_backend_add_activity    (EShellBackend *shell_backend,
                         EActivity *activity);
gboolean    e_shell_backend_is_busy     (EShellBackend *shell_backend);
void        e_shell_backend_set_prefer_new_item
                        (EShellBackend *shell_backend,
                         const gchar *prefer_new_item);
const gchar *   e_shell_backend_get_prefer_new_item
                        (EShellBackend *shell_backend);
void        e_shell_backend_cancel_all  (EShellBackend *shell_backend);
void        e_shell_backend_start       (EShellBackend *shell_backend);
gboolean    e_shell_backend_is_started  (EShellBackend *shell_backend);
gboolean    e_shell_backend_migrate     (EShellBackend *shell_backend,
                         gint major,
                         gint minor,
                         gint micro,
                         GError **error);

G_END_DECLS

#endif /* E_SHELL_BACKEND_H */