gio/gsettings.h

   1 /*
   2  * Copyright © 2009, 2010 Codethink Limited
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the licence, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  *
  19  * Author: Ryan Lortie <desrt@desrt.ca>
  20  */
  21
  22 #if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
  23 #error "Only <gio/gio.h> can be included directly."
  24 #endif
  25
  26 #ifndef __G_SETTINGS_H__
  27 #define __G_SETTINGS_H__
  28
  29 #include <gio/gsettingsschema.h>
  30 #include <gio/giotypes.h>
  31
  32 G_BEGIN_DECLS
  33
  34 #define G_TYPE_SETTINGS                                     (g_settings_get_type ())
  35 #define G_SETTINGS(inst)                                    (G_TYPE_CHECK_INSTANCE_CAST ((inst),                     \
  36                                                              G_TYPE_SETTINGS, GSettings))
  37 #define G_SETTINGS_CLASS(class)                             (G_TYPE_CHECK_CLASS_CAST ((class),                       \
  38                                                              G_TYPE_SETTINGS, GSettingsClass))
  39 #define G_IS_SETTINGS(inst)                                 (G_TYPE_CHECK_INSTANCE_TYPE ((inst), G_TYPE_SETTINGS))
  40 #define G_IS_SETTINGS_CLASS(class)                          (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_SETTINGS))
  41 #define G_SETTINGS_GET_CLASS(inst)                          (G_TYPE_INSTANCE_GET_CLASS ((inst),                      \
  42                                                              G_TYPE_SETTINGS, GSettingsClass))
  43
  44 typedef struct _GSettingsPrivate                            GSettingsPrivate;
  45 typedef struct _GSettingsClass                              GSettingsClass;
  46
  47 struct _GSettingsClass
  48 {
  49   GObjectClass parent_class;
  50
  51   /* Signals */
  52   void        (*writable_changed)      (GSettings    *settings,
  53                                         const gchar  *key);
  54   void        (*changed)               (GSettings    *settings,
  55                                         const gchar  *key);
  56   gboolean    (*writable_change_event) (GSettings    *settings,
  57                                         GQuark        key);
  58   gboolean    (*change_event)          (GSettings    *settings,
  59                                         const GQuark *keys,
  60                                         gint          n_keys);
  61
  62   gpointer padding[20];
  63 };
  64
  65 struct _GSettings
  66 {
  67   GObject parent_instance;
  68   GSettingsPrivate *priv;
  69 };
  70
  71
  72 GType                   g_settings_get_type                             (void);
  73
  74 const gchar * const *   g_settings_list_schemas                         (void);
  75 const gchar * const *   g_settings_list_relocatable_schemas             (void);
  76 GSettings *             g_settings_new                                  (const gchar        *schema_id);
  77 GSettings *             g_settings_new_with_path                        (const gchar        *schema_id,
  78                                                                          const gchar        *path);
  79 GSettings *             g_settings_new_with_backend                     (const gchar        *schema_id,
  80                                                                          GSettingsBackend   *backend);
  81 GSettings *             g_settings_new_with_backend_and_path            (const gchar        *schema_id,
  82                                                                          GSettingsBackend   *backend,
  83                                                                          const gchar        *path);
  84 GLIB_AVAILABLE_IN_2_32
  85 GSettings *             g_settings_new_full                             (GSettingsSchema    *schema,
  86                                                                          GSettingsBackend   *backend,
  87                                                                          const gchar        *path);
  88 gchar **                g_settings_list_children                        (GSettings          *settings);
  89 gchar **                g_settings_list_keys                            (GSettings          *settings);
  90 GVariant *              g_settings_get_range                            (GSettings          *settings,
  91                                                                          const gchar        *key);
  92 gboolean                g_settings_range_check                          (GSettings          *settings,
  93                                                                          const gchar        *key,
  94                                                                          GVariant           *value);
  95
  96 gboolean                g_settings_set_value                            (GSettings          *settings,
  97                                                                          const gchar        *key,
  98                                                                          GVariant           *value);
  99 GVariant *              g_settings_get_value                            (GSettings          *settings,
 100                                                                          const gchar        *key);
 101
 102 gboolean                g_settings_set                                  (GSettings          *settings,
 103                                                                          const gchar        *key,
 104                                                                          const gchar        *format,
 105                                                                          ...);
 106 void                    g_settings_get                                  (GSettings          *settings,
 107                                                                          const gchar        *key,
 108                                                                          const gchar        *format,
 109                                                                          ...);
 110 void                    g_settings_reset                                (GSettings          *settings,
 111                                                                          const gchar        *key);
 112
 113 gint                    g_settings_get_int                              (GSettings          *settings,
 114                                                                          const gchar        *key);
 115 gboolean                g_settings_set_int                              (GSettings          *settings,
 116                                                                          const gchar        *key,
 117                                                                          gint                value);
 118 guint                   g_settings_get_uint                             (GSettings          *settings,
 119                                                                          const gchar        *key);
 120 gboolean                g_settings_set_uint                             (GSettings          *settings,
 121                                                                          const gchar        *key,
 122                                                                          guint               value);
 123 gchar *                 g_settings_get_string                           (GSettings          *settings,
 124                                                                          const gchar        *key);
 125 gboolean                g_settings_set_string                           (GSettings          *settings,
 126                                                                          const gchar        *key,
 127                                                                          const gchar        *value);
 128 gboolean                g_settings_get_boolean                          (GSettings          *settings,
 129                                                                          const gchar        *key);
 130 gboolean                g_settings_set_boolean                          (GSettings          *settings,
 131                                                                          const gchar        *key,
 132                                                                          gboolean            value);
 133 gdouble                 g_settings_get_double                           (GSettings          *settings,
 134                                                                          const gchar        *key);
 135 gboolean                g_settings_set_double                           (GSettings          *settings,
 136                                                                          const gchar        *key,
 137                                                                          gdouble             value);
 138 gchar **                g_settings_get_strv                             (GSettings          *settings,
 139                                                                          const gchar        *key);
 140 gboolean                g_settings_set_strv                             (GSettings          *settings,
 141                                                                          const gchar        *key,
 142                                                                          const gchar *const *value);
 143 gint                    g_settings_get_enum                             (GSettings          *settings,
 144                                                                          const gchar        *key);
 145 gboolean                g_settings_set_enum                             (GSettings          *settings,
 146                                                                          const gchar        *key,
 147                                                                          gint                value);
 148 guint                   g_settings_get_flags                            (GSettings          *settings,
 149                                                                          const gchar        *key);
 150 gboolean                g_settings_set_flags                            (GSettings          *settings,
 151                                                                          const gchar        *key,
 152                                                                          guint               value);
 153 GSettings *             g_settings_get_child                            (GSettings          *settings,
 154                                                                          const gchar        *name);
 155
 156 gboolean                g_settings_is_writable                          (GSettings          *settings,
 157                                                                          const gchar        *name);
 158
 159 void                    g_settings_delay                                (GSettings          *settings);
 160 void                    g_settings_apply                                (GSettings          *settings);
 161 void                    g_settings_revert                               (GSettings          *settings);
 162 gboolean                g_settings_get_has_unapplied                    (GSettings          *settings);
 163 void                    g_settings_sync                                 (void);
 164
 165 /**
 166  * GSettingsBindSetMapping:
 167  * @value: a #GValue containing the property value to map
 168  * @expected_type: the #GVariantType to create
 169  * @user_data: user data that was specified when the binding was created
 170  *
 171  * The type for the function that is used to convert an object property
 172  * value to a #GVariant for storing it in #GSettings.
 173  *
 174  * Returns: a new #GVariant holding the data from @value,
 175  *     or %NULL in case of an error
 176  */
 177 typedef GVariant *    (*GSettingsBindSetMapping)                        (const GValue       *value,
 178                                                                          const GVariantType *expected_type,
 179                                                                          gpointer            user_data);
 180
 181 /**
 182  * GSettingsBindGetMapping:
 183  * @value: return location for the property value
 184  * @variant: the #GVariant
 185  * @user_data: user data that was specified when the binding was created
 186  *
 187  * The type for the function that is used to convert from #GSettings to
 188  * an object property. The @value is already initialized to hold values
 189  * of the appropriate type.
 190  *
 191  * Returns: %TRUE if the conversion succeeded, %FALSE in case of an error
 192  */
 193 typedef gboolean      (*GSettingsBindGetMapping)                        (GValue             *value,
 194                                                                          GVariant           *variant,
 195                                                                          gpointer            user_data);
 196
 197 /**
 198  * GSettingsGetMapping:
 199  * @value: the #GVariant to map, or %NULL
 200  * @result: (out): the result of the mapping
 201  * @user_data: (closure): the user data that was passed to
 202  * g_settings_get_mapped()
 203  *
 204  * The type of the function that is used to convert from a value stored
 205  * in a #GSettings to a value that is useful to the application.
 206  *
 207  * If the value is successfully mapped, the result should be stored at
 208  * @result and %TRUE returned.  If mapping fails (for example, if @value
 209  * is not in the right format) then %FALSE should be returned.
 210  *
 211  * If @value is %NULL then it means that the mapping function is being
 212  * given a "last chance" to successfully return a valid value.  %TRUE
 213  * must be returned in this case.
 214  *
 215  * Returns: %TRUE if the conversion succeeded, %FALSE in case of an error
 216  **/
 217 typedef gboolean      (*GSettingsGetMapping)                            (GVariant           *value,
 218                                                                          gpointer           *result,
 219                                                                          gpointer            user_data);
 220
 221 /**
 222  * GSettingsBindFlags:
 223  * @G_SETTINGS_BIND_DEFAULT: Equivalent to <literal>G_SETTINGS_BIND_GET|G_SETTINGS_BIND_SET</literal>
 224  * @G_SETTINGS_BIND_GET: Update the #GObject property when the setting changes.
 225  *     It is an error to use this flag if the property is not writable.
 226  * @G_SETTINGS_BIND_SET: Update the setting when the #GObject property changes.
 227  *     It is an error to use this flag if the property is not readable.
 228  * @G_SETTINGS_BIND_NO_SENSITIVITY: Do not try to bind a "sensitivity" property to the writability of the setting
 229  * @G_SETTINGS_BIND_GET_NO_CHANGES: When set in addition to #G_SETTINGS_BIND_GET, set the #GObject property
 230  *     value initially from the setting, but do not listen for changes of the setting
 231  * @G_SETTINGS_BIND_INVERT_BOOLEAN: When passed to g_settings_bind(), uses a pair of mapping functions that invert
 232  *     the boolean value when mapping between the setting and the property.  The setting and property must both
 233  *     be booleans.  You cannot pass this flag to g_settings_bind_with_mapping().
 234  *
 235  * Flags used when creating a binding. These flags determine in which
 236  * direction the binding works. The default is to synchronize in both
 237  * directions.
 238  */
 239 typedef enum
 240 {
 241   G_SETTINGS_BIND_DEFAULT,
 242   G_SETTINGS_BIND_GET            = (1<<0),
 243   G_SETTINGS_BIND_SET            = (1<<1),
 244   G_SETTINGS_BIND_NO_SENSITIVITY = (1<<2),
 245   G_SETTINGS_BIND_GET_NO_CHANGES = (1<<3),
 246   G_SETTINGS_BIND_INVERT_BOOLEAN = (1<<4)
 247 } GSettingsBindFlags;
 248
 249 void                    g_settings_bind                                 (GSettings               *settings,
 250                                                                          const gchar             *key,
 251                                                                          gpointer                 object,
 252                                                                          const gchar             *property,
 253                                                                          GSettingsBindFlags       flags);
 254 void                    g_settings_bind_with_mapping                    (GSettings               *settings,
 255                                                                          const gchar             *key,
 256                                                                          gpointer                 object,
 257                                                                          const gchar             *property,
 258                                                                          GSettingsBindFlags       flags,
 259                                                                          GSettingsBindGetMapping  get_mapping,
 260                                                                          GSettingsBindSetMapping  set_mapping,
 261                                                                          gpointer                 user_data,
 262                                                                          GDestroyNotify           destroy);
 263 void                    g_settings_bind_writable                        (GSettings               *settings,
 264                                                                          const gchar             *key,
 265                                                                          gpointer                 object,
 266                                                                          const gchar             *property,
 267                                                                          gboolean                 inverted);
 268 void                    g_settings_unbind                               (gpointer                 object,
 269                                                                          const gchar             *property);
 270
 271 GLIB_AVAILABLE_IN_2_32
 272 GAction *               g_settings_create_action                        (GSettings               *settings,
 273                                                                          const gchar             *key);
 274
 275 gpointer                g_settings_get_mapped                           (GSettings               *settings,
 276                                                                          const gchar             *key,
 277                                                                          GSettingsGetMapping      mapping,
 278                                                                          gpointer                 user_data);
 279
 280 G_END_DECLS
 281
 282 #endif  /* __G_SETTINGS_H__ */