1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1997-1999, 2000-2001 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>
29 /* --- type macros --- */
30 #define G_TYPE_IS_PARAM(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_PARAM)
31 #define G_PARAM_SPEC_TYPE(pspec) (G_TYPE_FROM_INSTANCE (pspec))
32 #define G_PARAM_SPEC_TYPE_NAME(pspec) (g_type_name (G_PARAM_SPEC_TYPE (pspec)))
33 #define G_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM, GParamSpec))
34 #define G_IS_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM))
35 #define G_PARAM_SPEC_GET_CLASS(pspec) (G_TYPE_INSTANCE_GET_CLASS ((pspec), G_TYPE_PARAM, GParamSpecClass))
36 #define G_PARAM_SPEC_VALUE_TYPE(pspec) (G_PARAM_SPEC (pspec)->value_type)
37 #define G_VALUE_HOLDS_PARAM(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_PARAM))
43 G_PARAM_READABLE = 1 << 0,
44 G_PARAM_WRITABLE = 1 << 1,
45 G_PARAM_CONSTRUCT = 1 << 2,
46 G_PARAM_CONSTRUCT_ONLY = 1 << 3,
47 G_PARAM_LAX_VALIDATION = 1 << 4,
48 G_PARAM_PRIVATE = 1 << 5
50 #define G_PARAM_READWRITE (G_PARAM_READABLE | G_PARAM_WRITABLE)
51 #define G_PARAM_MASK (0x000000ff)
52 /* bits in the range 0xffffff00 are reserved for 3rd party usage */
53 #define G_PARAM_USER_SHIFT (8)
56 /* --- typedefs & structures --- */
57 typedef struct _GParamSpec GParamSpec;
58 typedef struct _GParamSpecClass GParamSpecClass;
59 typedef struct _GParamSpecPool GParamSpecPool;
62 GTypeInstance g_type_instance;
75 struct _GParamSpecClass
77 GTypeClass g_type_class;
81 void (*finalize) (GParamSpec *pspec);
84 void (*value_set_default) (GParamSpec *pspec,
86 gboolean (*value_validate) (GParamSpec *pspec,
88 gint (*values_cmp) (GParamSpec *pspec,
90 const GValue *value2);
94 /* --- prototypes --- */
95 GParamSpec* g_param_spec_ref (GParamSpec *pspec);
96 void g_param_spec_unref (GParamSpec *pspec);
97 void g_param_spec_sink (GParamSpec *pspec);
98 gpointer g_param_spec_get_qdata (GParamSpec *pspec,
100 void g_param_spec_set_qdata (GParamSpec *pspec,
103 void g_param_spec_set_qdata_full (GParamSpec *pspec,
106 GDestroyNotify destroy);
107 gpointer g_param_spec_steal_qdata (GParamSpec *pspec,
109 void g_param_value_set_default (GParamSpec *pspec,
111 gboolean g_param_value_defaults (GParamSpec *pspec,
113 gboolean g_param_value_validate (GParamSpec *pspec,
115 gboolean g_param_value_convert (GParamSpec *dest_value_spec,
116 const GValue *src_value,
118 gboolean strict_validation);
119 gint g_param_values_cmp (GParamSpec *pspec,
120 const GValue *value1,
121 const GValue *value2);
122 void g_value_set_param (GValue *value,
124 GParamSpec* g_value_get_param (const GValue *value);
125 GParamSpec* g_value_dup_param (const GValue *value);
128 /* --- convenience functions --- */
129 typedef struct _GParamSpecTypeInfo GParamSpecTypeInfo;
130 struct _GParamSpecTypeInfo
132 /* type system portion */
133 guint16 instance_size; /* obligatory */
134 guint16 n_preallocs; /* optional */
135 void (*instance_init) (GParamSpec *pspec); /* optional */
138 GType value_type; /* obligatory */
139 void (*finalize) (GParamSpec *pspec); /* optional */
140 void (*value_set_default) (GParamSpec *pspec, /* recommended */
142 gboolean (*value_validate) (GParamSpec *pspec, /* optional */
144 gint (*values_cmp) (GParamSpec *pspec, /* recommended */
145 const GValue *value1,
146 const GValue *value2);
148 GType g_param_type_register_static (const gchar *name,
149 const GParamSpecTypeInfo *pspec_info);
152 /* --- protected --- */
153 gpointer g_param_spec_internal (GType param_type,
158 GParamSpecPool* g_param_spec_pool_new (gboolean type_prefixing);
159 void g_param_spec_pool_insert (GParamSpecPool *pool,
162 void g_param_spec_pool_remove (GParamSpecPool *pool,
164 GParamSpec* g_param_spec_pool_lookup (GParamSpecPool *pool,
165 const gchar *param_name,
167 gboolean walk_ancestors);
168 GList* g_param_spec_pool_list (GParamSpecPool *pool,
175 * gboolean value_validate (GParamSpec *pspec,
177 * modify value contents in the least destructive way, so
178 * that it complies with pspec's requirements (i.e.
179 * according to minimum/maximum ranges etc...). return
180 * whether modification was necessary.
182 * gint values_cmp (GParamSpec *pspec,
183 * const GValue *value1,
184 * const GValue *value2):
185 * return value1 - value2, i.e. <0 if value1 < value2,
186 * >0 if value1 > value2, and 0 otherwise (they are equal)
191 #endif /* __G_PARAM_H__ */