/* GObject - GLib Type, Object, Parameter and Signal Library * Copyright (C) 1997-1999, 2000-2001 Tim Janik and Red Hat, Inc. * * This library 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) any later version. * * This library 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 this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. * * gparam.h: GParamSpec base class implementation */ #ifndef __G_PARAM_H__ #define __G_PARAM_H__ #include #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ /* --- type macros --- */ #define G_TYPE_IS_PARAM(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_PARAM) #define G_PARAM_SPEC_TYPE(pspec) (G_TYPE_FROM_INSTANCE (pspec)) #define G_PARAM_SPEC_TYPE_NAME(pspec) (g_type_name (G_PARAM_SPEC_TYPE (pspec))) #define G_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM, GParamSpec)) #define G_IS_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM)) #define G_PARAM_SPEC_GET_CLASS(pspec) (G_TYPE_INSTANCE_GET_CLASS ((pspec), G_TYPE_PARAM, GParamSpecClass)) #define G_PARAM_SPEC_VALUE_TYPE(pspec) (G_PARAM_SPEC (pspec)->value_type) #define G_VALUE_HOLDS_PARAM(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_PARAM)) /* --- flags --- */ typedef enum { G_PARAM_READABLE = 1 << 0, G_PARAM_WRITABLE = 1 << 1, G_PARAM_CONSTRUCT = 1 << 2, G_PARAM_CONSTRUCT_ONLY = 1 << 3, G_PARAM_LAX_VALIDATION = 1 << 4, G_PARAM_PRIVATE = 1 << 5 } GParamFlags; #define G_PARAM_READWRITE (G_PARAM_READABLE | G_PARAM_WRITABLE) #define G_PARAM_MASK (0x000000ff) /* bits in the range 0xffffff00 are reserved for 3rd party usage */ #define G_PARAM_USER_SHIFT (8) /* --- typedefs & structures --- */ typedef struct _GParamSpec GParamSpec; typedef struct _GParamSpecClass GParamSpecClass; typedef struct _GParamSpecPool GParamSpecPool; struct _GParamSpec { GTypeInstance g_type_instance; gchar *name; gchar *nick; gchar *blurb; GParamFlags flags; GType value_type; /*< private >*/ GType owner_type; GData *qdata; guint ref_count; }; struct _GParamSpecClass { GTypeClass g_type_class; GType value_type; void (*finalize) (GParamSpec *pspec); /* GParam methods */ void (*value_set_default) (GParamSpec *pspec, GValue *value); gboolean (*value_validate) (GParamSpec *pspec, GValue *value); gint (*values_cmp) (GParamSpec *pspec, const GValue *value1, const GValue *value2); }; /* --- prototypes --- */ GParamSpec* g_param_spec_ref (GParamSpec *pspec); void g_param_spec_unref (GParamSpec *pspec); void g_param_spec_sink (GParamSpec *pspec); gpointer g_param_spec_get_qdata (GParamSpec *pspec, GQuark quark); void g_param_spec_set_qdata (GParamSpec *pspec, GQuark quark, gpointer data); void g_param_spec_set_qdata_full (GParamSpec *pspec, GQuark quark, gpointer data, GDestroyNotify destroy); gpointer g_param_spec_steal_qdata (GParamSpec *pspec, GQuark quark); void g_param_value_set_default (GParamSpec *pspec, GValue *value); gboolean g_param_value_defaults (GParamSpec *pspec, GValue *value); gboolean g_param_value_validate (GParamSpec *pspec, GValue *value); gboolean g_param_value_convert (GParamSpec *dest_value_spec, const GValue *src_value, GValue *dest_value, gboolean strict_validation); gint g_param_values_cmp (GParamSpec *pspec, const GValue *value1, const GValue *value2); void g_value_set_param (GValue *value, GParamSpec *param); GParamSpec* g_value_get_param (const GValue *value); GParamSpec* g_value_dup_param (const GValue *value); /* --- convenience functions --- */ typedef struct _GParamSpecTypeInfo GParamSpecTypeInfo; struct _GParamSpecTypeInfo { /* type system portion */ guint16 instance_size; /* obligatory */ guint16 n_preallocs; /* optional */ void (*instance_init) (GParamSpec *pspec); /* optional */ /* class portion */ GType value_type; /* obligatory */ void (*finalize) (GParamSpec *pspec); /* optional */ void (*value_set_default) (GParamSpec *pspec, /* recommended */ GValue *value); gboolean (*value_validate) (GParamSpec *pspec, /* optional */ GValue *value); gint (*values_cmp) (GParamSpec *pspec, /* recommended */ const GValue *value1, const GValue *value2); }; GType g_param_type_register_static (const gchar *name, const GParamSpecTypeInfo *pspec_info); /* --- protected --- */ gpointer g_param_spec_internal (GType param_type, const gchar *name, const gchar *nick, const gchar *blurb, GParamFlags flags); GParamSpecPool* g_param_spec_pool_new (gboolean type_prefixing); void g_param_spec_pool_insert (GParamSpecPool *pool, GParamSpec *pspec, GType owner_type); void g_param_spec_pool_remove (GParamSpecPool *pool, GParamSpec *pspec); GParamSpec* g_param_spec_pool_lookup (GParamSpecPool *pool, const gchar *param_name, GType owner_type, gboolean walk_ancestors); /* contracts: * * gboolean value_validate (GParamSpec *pspec, * GValue *value): * modify value contents in the least destructive way, so * that it complies with pspec's requirements (i.e. * according to minimum/maximum ranges etc...). return * whether modification was necessary. * * gint values_cmp (GParamSpec *pspec, * const GValue *value1, * const GValue *value2): * return value1 - value2, i.e. <0 if value1 < value2, * >0 if value1 > value2, and 0 otherwise (they are equal) */ #ifdef __cplusplus } #endif /* __cplusplus */ #endif /* __G_PARAM_H__ */