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1 office 1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1997-1999, 2000-2001 Tim Janik and Red Hat, Inc.
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 License, 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
15 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
16 *
17 * gparam.h: GParamSpec base class implementation
18 */
19 #ifndef __G_PARAM_H__
20 #define __G_PARAM_H__
21  
22 #if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
23 #error "Only <glib-object.h> can be included directly."
24 #endif
25  
26 #include <gobject/gvalue.h>
27  
28 G_BEGIN_DECLS
29  
30 /* --- standard type macros --- */
31 /**
32 * G_TYPE_IS_PARAM:
33 * @type: a #GType ID
34 *
35 * Checks whether @type "is a" %G_TYPE_PARAM.
36 */
37 #define G_TYPE_IS_PARAM(type) (G_TYPE_FUNDAMENTAL (type) == G_TYPE_PARAM)
38 /**
39 * G_PARAM_SPEC:
40 * @pspec: a valid #GParamSpec
41 *
42 * Casts a derived #GParamSpec object (e.g. of type #GParamSpecInt) into
43 * a #GParamSpec object.
44 */
45 #define G_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), G_TYPE_PARAM, GParamSpec))
46 /**
47 * G_IS_PARAM_SPEC:
48 * @pspec: a #GParamSpec
49 *
50 * Checks whether @pspec "is a" valid #GParamSpec structure of type %G_TYPE_PARAM
51 * or derived.
52 */
53 #if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_42
54 #define G_IS_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_FUNDAMENTAL_TYPE ((pspec), G_TYPE_PARAM))
55 #else
56 #define G_IS_PARAM_SPEC(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), G_TYPE_PARAM))
57 #endif
58 /**
59 * G_PARAM_SPEC_CLASS:
60 * @pclass: a valid #GParamSpecClass
61 *
62 * Casts a derived #GParamSpecClass structure into a #GParamSpecClass structure.
63 */
64 #define G_PARAM_SPEC_CLASS(pclass) (G_TYPE_CHECK_CLASS_CAST ((pclass), G_TYPE_PARAM, GParamSpecClass))
65 /**
66 * G_IS_PARAM_SPEC_CLASS:
67 * @pclass: a #GParamSpecClass
68 *
69 * Checks whether @pclass "is a" valid #GParamSpecClass structure of type
70 * %G_TYPE_PARAM or derived.
71 */
72 #define G_IS_PARAM_SPEC_CLASS(pclass) (G_TYPE_CHECK_CLASS_TYPE ((pclass), G_TYPE_PARAM))
73 /**
74 * G_PARAM_SPEC_GET_CLASS:
75 * @pspec: a valid #GParamSpec
76 *
77 * Retrieves the #GParamSpecClass of a #GParamSpec.
78 */
79 #define G_PARAM_SPEC_GET_CLASS(pspec) (G_TYPE_INSTANCE_GET_CLASS ((pspec), G_TYPE_PARAM, GParamSpecClass))
80  
81  
82 /* --- convenience macros --- */
83 /**
84 * G_PARAM_SPEC_TYPE:
85 * @pspec: a valid #GParamSpec
86 *
87 * Retrieves the #GType of this @pspec.
88 */
89 #define G_PARAM_SPEC_TYPE(pspec) (G_TYPE_FROM_INSTANCE (pspec))
90 /**
91 * G_PARAM_SPEC_TYPE_NAME:
92 * @pspec: a valid #GParamSpec
93 *
94 * Retrieves the #GType name of this @pspec.
95 */
96 #define G_PARAM_SPEC_TYPE_NAME(pspec) (g_type_name (G_PARAM_SPEC_TYPE (pspec)))
97 /**
98 * G_PARAM_SPEC_VALUE_TYPE:
99 * @pspec: a valid #GParamSpec
100 *
101 * Retrieves the #GType to initialize a #GValue for this parameter.
102 */
103 #define G_PARAM_SPEC_VALUE_TYPE(pspec) (G_PARAM_SPEC (pspec)->value_type)
104 /**
105 * G_VALUE_HOLDS_PARAM:
106 * @value: a valid #GValue structure
107 *
108 * Checks whether the given #GValue can hold values derived from type %G_TYPE_PARAM.
109 *
110 * Returns: %TRUE on success.
111 */
112 #define G_VALUE_HOLDS_PARAM(value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_TYPE_PARAM))
113  
114  
115 /* --- flags --- */
116 /**
117 * GParamFlags:
118 * @G_PARAM_READABLE: the parameter is readable
119 * @G_PARAM_WRITABLE: the parameter is writable
120 * @G_PARAM_READWRITE: alias for %G_PARAM_READABLE | %G_PARAM_WRITABLE
121 * @G_PARAM_CONSTRUCT: the parameter will be set upon object construction
122 * @G_PARAM_CONSTRUCT_ONLY: the parameter can only be set upon object construction
123 * @G_PARAM_LAX_VALIDATION: upon parameter conversion (see g_param_value_convert())
124 * strict validation is not required
125 * @G_PARAM_STATIC_NAME: the string used as name when constructing the
126 * parameter is guaranteed to remain valid and
127 * unmodified for the lifetime of the parameter.
128 * Since 2.8
129 * @G_PARAM_STATIC_NICK: the string used as nick when constructing the
130 * parameter is guaranteed to remain valid and
131 * unmmodified for the lifetime of the parameter.
132 * Since 2.8
133 * @G_PARAM_STATIC_BLURB: the string used as blurb when constructing the
134 * parameter is guaranteed to remain valid and
135 * unmodified for the lifetime of the parameter.
136 * Since 2.8
137 * @G_PARAM_EXPLICIT_NOTIFY: calls to g_object_set_property() for this
138 * property will not automatically result in a "notify" signal being
139 * emitted: the implementation must call g_object_notify() themselves
140 * in case the property actually changes. Since: 2.42.
141 * @G_PARAM_PRIVATE: internal
142 * @G_PARAM_DEPRECATED: the parameter is deprecated and will be removed
143 * in a future version. A warning will be generated if it is used
144 * while running with G_ENABLE_DIAGNOSTIC=1.
145 * Since 2.26
146 *
147 * Through the #GParamFlags flag values, certain aspects of parameters
148 * can be configured. See also #G_PARAM_STATIC_STRINGS.
149 */
150 typedef enum
151 {
152 G_PARAM_READABLE = 1 << 0,
153 G_PARAM_WRITABLE = 1 << 1,
154 G_PARAM_READWRITE = (G_PARAM_READABLE | G_PARAM_WRITABLE),
155 G_PARAM_CONSTRUCT = 1 << 2,
156 G_PARAM_CONSTRUCT_ONLY = 1 << 3,
157 G_PARAM_LAX_VALIDATION = 1 << 4,
158 G_PARAM_STATIC_NAME = 1 << 5,
159 #ifndef G_DISABLE_DEPRECATED
160 G_PARAM_PRIVATE = G_PARAM_STATIC_NAME,
161 #endif
162 G_PARAM_STATIC_NICK = 1 << 6,
163 G_PARAM_STATIC_BLURB = 1 << 7,
164 /* User defined flags go here */
165 G_PARAM_EXPLICIT_NOTIFY = 1 << 30,
166 G_PARAM_DEPRECATED = 1 << 31
167 } GParamFlags;
168  
169 /**
170 * G_PARAM_STATIC_STRINGS:
171 *
172 * #GParamFlags value alias for %G_PARAM_STATIC_NAME | %G_PARAM_STATIC_NICK | %G_PARAM_STATIC_BLURB.
173 *
174 * Since 2.13.0
175 */
176 #define G_PARAM_STATIC_STRINGS (G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB)
177 /* bits in the range 0xffffff00 are reserved for 3rd party usage */
178 /**
179 * G_PARAM_MASK:
180 *
181 * Mask containing the bits of #GParamSpec.flags which are reserved for GLib.
182 */
183 #define G_PARAM_MASK (0x000000ff)
184 /**
185 * G_PARAM_USER_SHIFT:
186 *
187 * Minimum shift count to be used for user defined flags, to be stored in
188 * #GParamSpec.flags. The maximum allowed is 10.
189 */
190 #define G_PARAM_USER_SHIFT (8)
191  
192 /* --- typedefs & structures --- */
193 typedef struct _GParamSpec GParamSpec;
194 typedef struct _GParamSpecClass GParamSpecClass;
195 typedef struct _GParameter GParameter;
196 typedef struct _GParamSpecPool GParamSpecPool;
197 /**
198 * GParamSpec: (ref-func g_param_spec_ref_sink) (unref-func g_param_spec_uref) (set-value-func g_value_set_param) (get-value-func g_value_get_param)
199 * @g_type_instance: private #GTypeInstance portion
200 * @name: name of this parameter: always an interned string
201 * @flags: #GParamFlags flags for this parameter
202 * @value_type: the #GValue type for this parameter
203 * @owner_type: #GType type that uses (introduces) this parameter
204 *
205 * All other fields of the GParamSpec struct are private and
206 * should not be used directly.
207 */
208 struct _GParamSpec
209 {
210 GTypeInstance g_type_instance;
211  
212 const gchar *name; /* interned string */
213 GParamFlags flags;
214 GType value_type;
215 GType owner_type; /* class or interface using this property */
216  
217 /*< private >*/
218 gchar *_nick;
219 gchar *_blurb;
220 GData *qdata;
221 guint ref_count;
222 guint param_id; /* sort-criteria */
223 };
224 /**
225 * GParamSpecClass:
226 * @g_type_class: the parent class
227 * @value_type: the #GValue type for this parameter
228 * @finalize: The instance finalization function (optional), should chain
229 * up to the finalize method of the parent class.
230 * @value_set_default: Resets a @value to the default value for this type
231 * (recommended, the default is g_value_reset()), see
232 * g_param_value_set_default().
233 * @value_validate: Ensures that the contents of @value comply with the
234 * specifications set out by this type (optional), see
235 * g_param_value_validate().
236 * @values_cmp: Compares @value1 with @value2 according to this type
237 * (recommended, the default is memcmp()), see g_param_values_cmp().
238 *
239 * The class structure for the GParamSpec type.
240 * Normally, GParamSpec classes are filled by
241 * g_param_type_register_static().
242 */
243 struct _GParamSpecClass
244 {
245 GTypeClass g_type_class;
246  
247 GType value_type;
248  
249 void (*finalize) (GParamSpec *pspec);
250  
251 /* GParam methods */
252 void (*value_set_default) (GParamSpec *pspec,
253 GValue *value);
254 gboolean (*value_validate) (GParamSpec *pspec,
255 GValue *value);
256 gint (*values_cmp) (GParamSpec *pspec,
257 const GValue *value1,
258 const GValue *value2);
259 /*< private >*/
260 gpointer dummy[4];
261 };
262 /**
263 * GParameter:
264 * @name: the parameter name
265 * @value: the parameter value
266 *
267 * The GParameter struct is an auxiliary structure used
268 * to hand parameter name/value pairs to g_object_newv().
269 */
270 struct _GParameter /* auxiliary structure for _setv() variants */
271 {
272 const gchar *name;
273 GValue value;
274 };
275  
276  
277 /* --- prototypes --- */
278 GLIB_AVAILABLE_IN_ALL
279 GParamSpec* g_param_spec_ref (GParamSpec *pspec);
280 GLIB_AVAILABLE_IN_ALL
281 void g_param_spec_unref (GParamSpec *pspec);
282 GLIB_AVAILABLE_IN_ALL
283 void g_param_spec_sink (GParamSpec *pspec);
284 GLIB_AVAILABLE_IN_ALL
285 GParamSpec* g_param_spec_ref_sink (GParamSpec *pspec);
286 GLIB_AVAILABLE_IN_ALL
287 gpointer g_param_spec_get_qdata (GParamSpec *pspec,
288 GQuark quark);
289 GLIB_AVAILABLE_IN_ALL
290 void g_param_spec_set_qdata (GParamSpec *pspec,
291 GQuark quark,
292 gpointer data);
293 GLIB_AVAILABLE_IN_ALL
294 void g_param_spec_set_qdata_full (GParamSpec *pspec,
295 GQuark quark,
296 gpointer data,
297 GDestroyNotify destroy);
298 GLIB_AVAILABLE_IN_ALL
299 gpointer g_param_spec_steal_qdata (GParamSpec *pspec,
300 GQuark quark);
301 GLIB_AVAILABLE_IN_ALL
302 GParamSpec* g_param_spec_get_redirect_target (GParamSpec *pspec);
303  
304 GLIB_AVAILABLE_IN_ALL
305 void g_param_value_set_default (GParamSpec *pspec,
306 GValue *value);
307 GLIB_AVAILABLE_IN_ALL
308 gboolean g_param_value_defaults (GParamSpec *pspec,
309 GValue *value);
310 GLIB_AVAILABLE_IN_ALL
311 gboolean g_param_value_validate (GParamSpec *pspec,
312 GValue *value);
313 GLIB_AVAILABLE_IN_ALL
314 gboolean g_param_value_convert (GParamSpec *pspec,
315 const GValue *src_value,
316 GValue *dest_value,
317 gboolean strict_validation);
318 GLIB_AVAILABLE_IN_ALL
319 gint g_param_values_cmp (GParamSpec *pspec,
320 const GValue *value1,
321 const GValue *value2);
322 GLIB_AVAILABLE_IN_ALL
323 const gchar * g_param_spec_get_name (GParamSpec *pspec);
324 GLIB_AVAILABLE_IN_ALL
325 const gchar * g_param_spec_get_nick (GParamSpec *pspec);
326 GLIB_AVAILABLE_IN_ALL
327 const gchar * g_param_spec_get_blurb (GParamSpec *pspec);
328 GLIB_AVAILABLE_IN_ALL
329 void g_value_set_param (GValue *value,
330 GParamSpec *param);
331 GLIB_AVAILABLE_IN_ALL
332 GParamSpec* g_value_get_param (const GValue *value);
333 GLIB_AVAILABLE_IN_ALL
334 GParamSpec* g_value_dup_param (const GValue *value);
335  
336  
337 GLIB_AVAILABLE_IN_ALL
338 void g_value_take_param (GValue *value,
339 GParamSpec *param);
340 GLIB_DEPRECATED_FOR(g_value_take_param)
341 void g_value_set_param_take_ownership (GValue *value,
342 GParamSpec *param);
343 GLIB_AVAILABLE_IN_2_36
344 const GValue * g_param_spec_get_default_value (GParamSpec *pspec);
345  
346 GLIB_AVAILABLE_IN_2_46
347 GQuark g_param_spec_get_name_quark (GParamSpec *pspec);
348  
349 /* --- convenience functions --- */
350 typedef struct _GParamSpecTypeInfo GParamSpecTypeInfo;
351 /**
352 * GParamSpecTypeInfo:
353 * @instance_size: Size of the instance (object) structure.
354 * @n_preallocs: Prior to GLib 2.10, it specified the number of pre-allocated (cached) instances to reserve memory for (0 indicates no caching). Since GLib 2.10, it is ignored, since instances are allocated with the [slice allocator][glib-Memory-Slices] now.
355 * @instance_init: Location of the instance initialization function (optional).
356 * @value_type: The #GType of values conforming to this #GParamSpec
357 * @finalize: The instance finalization function (optional).
358 * @value_set_default: Resets a @value to the default value for @pspec
359 * (recommended, the default is g_value_reset()), see
360 * g_param_value_set_default().
361 * @value_validate: Ensures that the contents of @value comply with the
362 * specifications set out by @pspec (optional), see
363 * g_param_value_validate().
364 * @values_cmp: Compares @value1 with @value2 according to @pspec
365 * (recommended, the default is memcmp()), see g_param_values_cmp().
366 *
367 * This structure is used to provide the type system with the information
368 * required to initialize and destruct (finalize) a parameter's class and
369 * instances thereof.
370 * The initialized structure is passed to the g_param_type_register_static()
371 * The type system will perform a deep copy of this structure, so its memory
372 * does not need to be persistent across invocation of
373 * g_param_type_register_static().
374 */
375 struct _GParamSpecTypeInfo
376 {
377 /* type system portion */
378 guint16 instance_size; /* obligatory */
379 guint16 n_preallocs; /* optional */
380 void (*instance_init) (GParamSpec *pspec); /* optional */
381  
382 /* class portion */
383 GType value_type; /* obligatory */
384 void (*finalize) (GParamSpec *pspec); /* optional */
385 void (*value_set_default) (GParamSpec *pspec, /* recommended */
386 GValue *value);
387 gboolean (*value_validate) (GParamSpec *pspec, /* optional */
388 GValue *value);
389 gint (*values_cmp) (GParamSpec *pspec, /* recommended */
390 const GValue *value1,
391 const GValue *value2);
392 };
393 GLIB_AVAILABLE_IN_ALL
394 GType g_param_type_register_static (const gchar *name,
395 const GParamSpecTypeInfo *pspec_info);
396  
397 /* For registering builting types */
398 GType _g_param_type_register_static_constant (const gchar *name,
399 const GParamSpecTypeInfo *pspec_info,
400 GType opt_type);
401  
402  
403 /* --- protected --- */
404 GLIB_AVAILABLE_IN_ALL
405 gpointer g_param_spec_internal (GType param_type,
406 const gchar *name,
407 const gchar *nick,
408 const gchar *blurb,
409 GParamFlags flags);
410 GLIB_AVAILABLE_IN_ALL
411 GParamSpecPool* g_param_spec_pool_new (gboolean type_prefixing);
412 GLIB_AVAILABLE_IN_ALL
413 void g_param_spec_pool_insert (GParamSpecPool *pool,
414 GParamSpec *pspec,
415 GType owner_type);
416 GLIB_AVAILABLE_IN_ALL
417 void g_param_spec_pool_remove (GParamSpecPool *pool,
418 GParamSpec *pspec);
419 GLIB_AVAILABLE_IN_ALL
420 GParamSpec* g_param_spec_pool_lookup (GParamSpecPool *pool,
421 const gchar *param_name,
422 GType owner_type,
423 gboolean walk_ancestors);
424 GLIB_AVAILABLE_IN_ALL
425 GList* g_param_spec_pool_list_owned (GParamSpecPool *pool,
426 GType owner_type);
427 GLIB_AVAILABLE_IN_ALL
428 GParamSpec** g_param_spec_pool_list (GParamSpecPool *pool,
429 GType owner_type,
430 guint *n_pspecs_p);
431  
432  
433 /* contracts:
434 *
435 * gboolean value_validate (GParamSpec *pspec,
436 * GValue *value):
437 * modify value contents in the least destructive way, so
438 * that it complies with pspec's requirements (i.e.
439 * according to minimum/maximum ranges etc...). return
440 * whether modification was necessary.
441 *
442 * gint values_cmp (GParamSpec *pspec,
443 * const GValue *value1,
444 * const GValue *value2):
445 * return value1 - value2, i.e. (-1) if value1 < value2,
446 * (+1) if value1 > value2, and (0) otherwise (equality)
447 */
448  
449 G_END_DECLS
450  
451 #endif /* __G_PARAM_H__ */