1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1997, 1998, 1999, 2000 Tim Janik and Red Hat, Inc.
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 License, or (at your option) any later version.
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.
14 * You should have received a copy of the GNU Lesser General
15 * Public 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.
19 * gparam.h: GParamSpec base class implementation
25 #include <gobject/gvalue.h>
30 #endif /* __cplusplus */
33 /* --- type macros --- */
34 #define G_TYPE_IS_PARAM(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_PARAM)
35 #define G_PARAM_SPEC_TYPE(pspec) (G_TYPE_FROM_INSTANCE (pspec))
36 #define G_PARAM_SPEC_TYPE_NAME(pspec) (g_type_name (G_PARAM_SPEC_TYPE (pspec)))
37 #define G_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM, GParamSpec))
38 #define G_IS_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM))
39 #define G_PARAM_SPEC_GET_CLASS(pspec) (G_TYPE_INSTANCE_GET_CLASS ((pspec), G_TYPE_PARAM, GParamSpecClass))
40 #define G_PARAM_SPEC_VALUE_TYPE(pspec) (G_PARAM_SPEC_GET_CLASS (pspec)->value_type)
41 #define G_IS_VALUE_PARAM(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_PARAM))
47 G_PARAM_READABLE = 1 << 0,
48 G_PARAM_WRITABLE = 1 << 1,
49 G_PARAM_CONSTRUCT = 1 << 2,
50 G_PARAM_CONSTRUCT_ONLY = 1 << 3,
51 G_PARAM_PRIVATE = 1 << 4,
52 #define G_PARAM_MASK (0x000000ff)
53 /* bits in the range 0xffffff00 are reserved for 3rd party usage */
54 #define G_PARAM_USER_MASK (0xffffff00)
58 /* --- typedefs & structures --- */
59 typedef struct _GParamSpec GParamSpec;
60 typedef struct _GParamSpecClass GParamSpecClass;
61 typedef struct _GParamSpecPool GParamSpecPool;
64 GTypeInstance g_type_instance;
76 struct _GParamSpecClass
78 GTypeClass g_type_class;
82 void (*finalize) (GParamSpec *pspec);
85 void (*value_set_default) (GParamSpec *pspec,
87 gboolean (*value_validate) (GParamSpec *pspec,
89 gint (*values_cmp) (GParamSpec *pspec,
91 const GValue *value2);
95 /* --- prototypes --- */
96 GParamSpec* g_param_spec_ref (GParamSpec *pspec);
97 void g_param_spec_unref (GParamSpec *pspec);
98 void g_param_spec_sink (GParamSpec *pspec);
99 gpointer g_param_spec_get_qdata (GParamSpec *pspec,
101 void g_param_spec_set_qdata (GParamSpec *pspec,
104 void g_param_spec_set_qdata_full (GParamSpec *pspec,
107 GDestroyNotify destroy);
108 gpointer g_param_spec_steal_qdata (GParamSpec *pspec,
110 void g_param_value_set_default (GParamSpec *pspec,
112 gboolean g_param_value_defaults (GParamSpec *pspec,
114 gboolean g_param_value_validate (GParamSpec *pspec,
116 gint g_param_values_cmp (GParamSpec *pspec,
117 const GValue *value1,
118 const GValue *value2);
119 void g_value_set_param (GValue *value,
121 GParamSpec* g_value_get_param (const GValue *value);
122 GParamSpec* g_value_dup_param (const GValue *value);
125 /* --- convenience functions --- */
126 typedef struct _GParamSpecTypeInfo GParamSpecTypeInfo;
127 struct _GParamSpecTypeInfo
129 /* type system portion */
130 guint16 instance_size; /* obligatory */
131 guint16 n_preallocs; /* optional */
132 void (*instance_init) (GParamSpec *pspec); /* optional */
135 GType value_type; /* obligatory */
136 void (*finalize) (GParamSpec *pspec); /* optional */
137 void (*value_set_default) (GParamSpec *pspec, /* recommended */
139 gboolean (*value_validate) (GParamSpec *pspec, /* optional */
141 gint (*values_cmp) (GParamSpec *pspec, /* recommended */
142 const GValue *value1,
143 const GValue *value2);
145 GType g_param_type_register_static (const gchar *name,
146 const GParamSpecTypeInfo *pspec_info);
149 /* --- protected --- */
150 gpointer g_param_spec_internal (GType param_type,
155 GParamSpecPool* g_param_spec_pool_new (gboolean type_prefixing);
156 void g_param_spec_pool_insert (GParamSpecPool *pool,
159 void g_param_spec_pool_remove (GParamSpecPool *pool,
161 GParamSpec* g_param_spec_pool_lookup (GParamSpecPool *pool,
162 const gchar *param_name,
164 gboolean walk_ancestors,
165 const gchar **trailer_p);
170 * gboolean value_validate (GParamSpec *pspec,
172 * modify value contents in the least destructive way, so
173 * that it complies with pspec's requirements (i.e.
174 * according to minimum/maximum ranges etc...). return
175 * whether modification was necessary.
177 * gint values_cmp (GParamSpec *pspec,
178 * const GValue *value1,
179 * const GValue *value2):
180 * return value1 - value2, i.e. <0 if value1 < value2,
181 * >0 if value1 > value2, and 0 otherwise (they are equal)
186 #endif /* __cplusplus */
188 #endif /* __G_PARAM_H__ */