gio/gsettingsbackend.h

   1 /*
   2  * Copyright © 2009, 2010 Codethink Limited
   3  * Copyright © 2010 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the licence, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Authors: Ryan Lortie <desrt@desrt.ca>
  19  *          Matthias Clasen <mclasen@redhat.com>
  20  */
  21
  22 #ifndef __G_SETTINGS_BACKEND_H__
  23 #define __G_SETTINGS_BACKEND_H__
  24
  25 #if !defined (G_SETTINGS_ENABLE_BACKEND) && !defined (GIO_COMPILATION)
  26 #error "You must define G_SETTINGS_ENABLE_BACKEND before including <gio/gsettingsbackend.h>."
  27 #endif
  28
  29 #define __GIO_GIO_H_INSIDE__
  30 #include <gio/giotypes.h>
  31 #undef __GIO_GIO_H_INSIDE__
  32
  33 G_BEGIN_DECLS
  34
  35 #define G_TYPE_SETTINGS_BACKEND                             (g_settings_backend_get_type ())
  36 #define G_SETTINGS_BACKEND(inst)                            (G_TYPE_CHECK_INSTANCE_CAST ((inst),                     \
  37                                                              G_TYPE_SETTINGS_BACKEND, GSettingsBackend))
  38 #define G_SETTINGS_BACKEND_CLASS(class)                     (G_TYPE_CHECK_CLASS_CAST ((class),                       \
  39                                                              G_TYPE_SETTINGS_BACKEND, GSettingsBackendClass))
  40 #define G_IS_SETTINGS_BACKEND(inst)                         (G_TYPE_CHECK_INSTANCE_TYPE ((inst),                     \
  41                                                              G_TYPE_SETTINGS_BACKEND))
  42 #define G_IS_SETTINGS_BACKEND_CLASS(class)                  (G_TYPE_CHECK_CLASS_TYPE ((class),                       \
  43                                                              G_TYPE_SETTINGS_BACKEND))
  44 #define G_SETTINGS_BACKEND_GET_CLASS(inst)                  (G_TYPE_INSTANCE_GET_CLASS ((inst),                      \
  45                                                              G_TYPE_SETTINGS_BACKEND, GSettingsBackendClass))
  46
  47 /**
  48  * G_SETTINGS_BACKEND_EXTENSION_POINT_NAME:
  49  *
  50  * Extension point for #GSettingsBackend functionality.
  51  **/
  52 #define G_SETTINGS_BACKEND_EXTENSION_POINT_NAME "gsettings-backend"
  53
  54 /**
  55  * GSettingsBackend:
  56  *
  57  * An implementation of a settings storage repository.
  58  **/
  59 typedef struct _GSettingsBackendPrivate                     GSettingsBackendPrivate;
  60 typedef struct _GSettingsBackendClass                       GSettingsBackendClass;
  61
  62 /**
  63  * GSettingsBackendClass:
  64  * @read: virtual method to read a key's value
  65  * @get_writable: virtual method to get if a key is writable
  66  * @write: virtual method to change key's value
  67  * @write_tree: virtual method to change a tree of keys
  68  * @reset: virtual method to reset state
  69  * @subscribe: virtual method to subscribe to key changes
  70  * @unsubscribe: virtual method to unsubscribe to key changes
  71  * @sync: virtual method to sync state
  72  * @get_permission: virtual method to get permission of a key
  73  * @read_user_value: virtual method to read user's key value
  74  *
  75  * Class structure for #GSettingsBackend.
  76  */
  77 struct _GSettingsBackendClass
  78 {
  79   GObjectClass parent_class;
  80
  81   GVariant *    (*read)             (GSettingsBackend    *backend,
  82                                      const gchar         *key,
  83                                      const GVariantType  *expected_type,
  84                                      gboolean             default_value);
  85
  86   gboolean      (*get_writable)     (GSettingsBackend    *backend,
  87                                      const gchar         *key);
  88
  89   gboolean      (*write)            (GSettingsBackend    *backend,
  90                                      const gchar         *key,
  91                                      GVariant            *value,
  92                                      gpointer             origin_tag);
  93   gboolean      (*write_tree)       (GSettingsBackend    *backend,
  94                                      GTree               *tree,
  95                                      gpointer             origin_tag);
  96   void          (*reset)            (GSettingsBackend    *backend,
  97                                      const gchar         *key,
  98                                      gpointer             origin_tag);
  99
 100   void          (*subscribe)        (GSettingsBackend    *backend,
 101                                      const gchar         *name);
 102   void          (*unsubscribe)      (GSettingsBackend    *backend,
 103                                      const gchar         *name);
 104   void          (*sync)             (GSettingsBackend    *backend);
 105
 106   GPermission * (*get_permission)   (GSettingsBackend    *backend,
 107                                      const gchar         *path);
 108
 109   GVariant *    (*read_user_value)  (GSettingsBackend    *backend,
 110                                      const gchar         *key,
 111                                      const GVariantType  *expected_type);
 112
 113   /*< private >*/
 114   gpointer padding[23];
 115 };
 116
 117 struct _GSettingsBackend
 118 {
 119   GObject parent_instance;
 120
 121   /*< private >*/
 122   GSettingsBackendPrivate *priv;
 123 };
 124
 125 GLIB_AVAILABLE_IN_ALL
 126 GType                   g_settings_backend_get_type                     (void);
 127
 128 GLIB_AVAILABLE_IN_ALL
 129 void                    g_settings_backend_changed                      (GSettingsBackend    *backend,
 130                                                                          const gchar         *key,
 131                                                                          gpointer             origin_tag);
 132 GLIB_AVAILABLE_IN_ALL
 133 void                    g_settings_backend_path_changed                 (GSettingsBackend    *backend,
 134                                                                          const gchar         *path,
 135                                                                          gpointer             origin_tag);
 136 GLIB_AVAILABLE_IN_ALL
 137 void                    g_settings_backend_flatten_tree                 (GTree               *tree,
 138                                                                          gchar              **path,
 139                                                                          const gchar       ***keys,
 140                                                                          GVariant          ***values);
 141 GLIB_AVAILABLE_IN_ALL
 142 void                    g_settings_backend_keys_changed                 (GSettingsBackend    *backend,
 143                                                                          const gchar         *path,
 144                                                                          gchar const * const *items,
 145                                                                          gpointer             origin_tag);
 146
 147 GLIB_AVAILABLE_IN_ALL
 148 void                    g_settings_backend_path_writable_changed        (GSettingsBackend    *backend,
 149                                                                          const gchar         *path);
 150 GLIB_AVAILABLE_IN_ALL
 151 void                    g_settings_backend_writable_changed             (GSettingsBackend    *backend,
 152                                                                          const gchar         *key);
 153 GLIB_AVAILABLE_IN_ALL
 154 void                    g_settings_backend_changed_tree                 (GSettingsBackend    *backend,
 155                                                                          GTree               *tree,
 156                                                                          gpointer             origin_tag);
 157
 158 GLIB_AVAILABLE_IN_ALL
 159 GSettingsBackend *      g_settings_backend_get_default                  (void);
 160
 161 GLIB_AVAILABLE_IN_ALL
 162 GSettingsBackend *      g_keyfile_settings_backend_new                  (const gchar         *filename,
 163                                                                          const gchar         *root_path,
 164                                                                          const gchar         *root_group);
 165
 166 GLIB_AVAILABLE_IN_ALL
 167 GSettingsBackend *      g_null_settings_backend_new                     (void);
 168
 169 GLIB_AVAILABLE_IN_ALL
 170 GSettingsBackend *      g_memory_settings_backend_new                   (void);
 171
 172 G_END_DECLS
 173
 174 #endif /* __G_SETTINGS_BACKEND_H__ */