1 /* GTK - The GIMP Toolkit
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library 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 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the Free
16 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 #ifndef __GTK_OBJECT_H__
19 #define __GTK_OBJECT_H__
22 #include <gtk/gtkenums.h>
23 #include <gtk/gtktypeutils.h>
24 #include <gtk/gtkdebug.h>
29 #endif /* __cplusplus */
33 /* The debugging versions of the casting macros make sure the cast is "ok"
34 * before proceeding, but they are definately slower than their less
35 * careful counterparts as they involve no less than 3 function calls.
37 #ifdef GTK_NO_CHECK_CASTS
39 #define GTK_CHECK_CAST(obj,cast_type,cast) ((cast*) (obj))
40 #define GTK_CHECK_CLASS_CAST(klass,cast_type,cast) ((cast*) (klass))
42 #else /* !GTK_NO_CHECK_CASTS */
44 #define GTK_CHECK_CAST(obj,cast_type,cast) \
45 ((cast*) gtk_object_check_cast ((GtkObject*) (obj), cast_type))
47 #define GTK_CHECK_CLASS_CAST(klass,cast_type,cast) \
48 ((cast*) gtk_object_check_class_cast ((GtkObjectClass*) (klass), cast_type))
50 #endif /* GTK_NO_CHECK_CASTS */
53 /* Determines whether 'obj' is a type of 'otype'.
55 #define GTK_CHECK_TYPE(obj,otype) (gtk_type_is_a (((GtkObject*) (obj))->klass->type, otype))
58 /* Macro for casting a pointer to a GtkObject pointer.
60 #define GTK_OBJECT(obj) GTK_CHECK_CAST ((obj), gtk_object_get_type (), GtkObject)
62 /* Macros for extracting various fields from GtkObject and GtkObjectClass.
64 #define GTK_OBJECT_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), gtk_object_get_type (), GtkObjectClass))
65 #define GTK_OBJECT_TYPE(obj) (GTK_OBJECT (obj)->klass->type)
66 #define GTK_OBJECT_SIGNALS(obj) (GTK_OBJECT (obj)->klass->signals)
67 #define GTK_OBJECT_NSIGNALS(obj) (GTK_OBJECT (obj)->klass->nsignals)
69 /* GtkObject only uses the first 4 bits of the flags field.
70 * GtkWidget uses the remaining bits. Though this is a kinda nasty
71 * break up, it does make the size of GtkWidget smaller.
75 GTK_DESTROYED = 1 << 0,
76 GTK_FLOATING = 1 << 1,
77 GTK_RESERVED_1 = 1 << 2,
78 GTK_RESERVED_2 = 1 << 3
81 /* GtkArg access bits for gtk_object_add_arg_type
85 GTK_ARG_READABLE = 1 << 0,
86 GTK_ARG_WRITABLE = 1 << 1,
88 #define GTK_ARG_READWRITE (GTK_ARG_READABLE | GTK_ARG_WRITABLE)
91 /* Macros for extracting the object_flags from GtkObject.
93 #define GTK_OBJECT_FLAGS(obj) (GTK_OBJECT (obj)->flags)
94 #define GTK_OBJECT_DESTROYED(obj) (GTK_OBJECT_FLAGS (obj) & GTK_DESTROYED)
95 #define GTK_OBJECT_FLOATING(obj) (GTK_OBJECT_FLAGS (obj) & GTK_FLOATING)
97 /* Macros for setting and clearing bits in the object_flags field of GtkObject.
99 #define GTK_OBJECT_SET_FLAGS(obj,flag) G_STMT_START{ (GTK_OBJECT_FLAGS (obj) |= (flag)); }G_STMT_END
100 #define GTK_OBJECT_UNSET_FLAGS(obj,flag) G_STMT_START{ (GTK_OBJECT_FLAGS (obj) &= ~(flag)); }G_STMT_END
102 /* Macro for testing whether "obj" is of type GtkObject.
104 #define GTK_IS_OBJECT(obj) (GTK_CHECK_TYPE ((obj), gtk_object_get_type ()))
107 typedef struct _GtkObjectClass GtkObjectClass;
110 /* GtkObject is the base of the object hierarchy. It defines
111 * the few basic items that all derived classes contain.
115 /* A pointer to the objects class. This will actually point to
116 * the derived objects class struct (which will be derived from
119 GtkObjectClass *klass;
121 /* 32 bits of flags. GtkObject only uses 4 of these bits and
122 * GtkWidget uses the rest. This is done because structs are
123 * aligned on 4 or 8 byte boundaries. If a new bitfield were
124 * used in GtkWidget much space would be wasted.
129 * refer to the file REFCOUNTING on this issue.
133 /* The list of signal handlers and other data
134 * fields for this object.
136 gpointer object_data;
139 /* GtkObjectClass is the base of the class hierarchy. It defines
140 * the basic necessities for the class mechanism to work. Namely,
141 * the "type", "signals" and "nsignals" fields.
143 struct _GtkObjectClass
145 /* The type identifier for the objects class. There is
146 * one unique identifier per class.
150 /* The signals this object class handles. "signals" is an
151 * array of signal ID's.
155 /* The number of signals listed in "signals".
159 /* The number of arguments per class.
163 /* The destroy function for objects. In one way ore another
164 * this is defined for all objects. If an object class overrides
165 * this method in order to perform class specific destruction
166 * then it should still call it after it is finished with its
167 * own cleanup. (See the destroy function for GtkWidget for
168 * an example of how to do this).
170 void (* destroy) (GtkObject *object);
172 void (* finalize) (GtkObject *object);
176 /* For the purpose of user signals we need the signal function
177 * and signal marshaller signatures already in this place.
179 #define GTK_SIGNAL_FUNC(f) ((GtkSignalFunc) f)
181 typedef void (*GtkSignalFunc) (void);
182 typedef void (*GtkSignalMarshaller) (GtkObject *object,
188 /* Get the type identifier for GtkObject's.
190 guint gtk_object_get_type (void);
192 /* Append "signals" to those already defined in "class".
194 void gtk_object_class_add_signals (GtkObjectClass *klass,
198 /* Append a user defined signal without default handler to a class.
200 gint gtk_object_class_add_user_signal (GtkObjectClass *klass,
202 GtkSignalMarshaller marshaller,
207 GtkObject* gtk_object_new (guint type,
210 GtkObject* gtk_object_newv (guint type,
213 void gtk_object_sink (GtkObject *object);
214 void gtk_object_ref (GtkObject *object);
215 void gtk_object_unref (GtkObject *object);
217 void gtk_object_weakref (GtkObject *object,
218 GtkDestroyNotify notify,
220 void gtk_object_weakunref (GtkObject *object,
221 GtkDestroyNotify notify,
224 void gtk_object_destroy (GtkObject *object);
226 /* gtk_object_getv() sets an arguments type and value, or just
227 * its type to GTK_TYPE_INVALID.
228 * if arg->type == GTK_TYPE_STRING, it's the callers response to
229 * do a g_free (GTK_VALUE_STRING (arg));
231 void gtk_object_getv (GtkObject *object,
235 /* gtk_object_set() takes a variable argument list of the form:
236 * (..., gchar *arg_name, ARG_VALUES, [repeatedly name/value pairs,] NULL)
237 * where ARG_VALUES type depend on the argument and can consist of
238 * more than one c-function argument.
240 void gtk_object_set (GtkObject *object,
243 void gtk_object_setv (GtkObject *object,
247 /* Allocate a GtkArg array of size nargs that hold the
248 * names and types of the args that can be used with
249 * gtk_object_set/gtk_object_get. if (acess_masks!=NULL),
250 * (*access_mask) will be set to point to a newly allocated
251 * guint array that holds the access masks of the args.
252 * It is the callers response to do a
253 * g_free (returned_args); g_free (*acess_masks).
255 GtkArg* gtk_object_query_args (GtkType class_type,
259 void gtk_object_add_arg_type (const gchar *arg_name,
264 GtkType gtk_object_get_arg_type (const gchar *arg_name);
266 /* Set 'data' to the "object_data" field of the object. The
267 * data is indexed by the "key". If there is already data
268 * associated with "key" then the new data will replace it.
269 * If 'data' is NULL then this call is equivalent to
270 * 'gtk_object_remove_data'.
272 void gtk_object_set_data (GtkObject *object,
276 /* Like gtk_object_set_data, but takes an additional argument
277 * which is a function to be called when the data is removed
279 void gtk_object_set_data_full (GtkObject *object,
282 GtkDestroyNotify destroy);
284 /* Get the data associated with "key".
286 gpointer gtk_object_get_data (GtkObject *object,
289 /* Remove the data associated with "key". This call is
290 * equivalent to 'gtk_object_set_data' where 'data' is NULL.
292 void gtk_object_remove_data (GtkObject *object,
295 /* Set the "user_data" object data field of "object". It should
296 * be noted that this is no different than calling 'gtk_object_data_add'
297 * with a key of "user_data". It is merely provided as a convenience.
299 void gtk_object_set_user_data (GtkObject *object,
302 /* Get the "user_data" object data field of "object". It should
303 * be noted that this is no different than calling 'gtk_object_get_data'
304 * with a key of "user_data". It is merely provided as a convenience.
306 gpointer gtk_object_get_user_data (GtkObject *object);
308 GtkObject* gtk_object_check_cast (GtkObject *obj,
311 GtkObjectClass* gtk_object_check_class_cast (GtkObjectClass *klass,
314 void gtk_trace_referencing (gpointer *object,
320 #if G_ENABLE_DEBUG && defined (__GNUC__)
321 # define gtk_object_ref(o) G_STMT_START{static guint f=0;gtk_trace_referencing((gpointer)o,__PRETTY_FUNCTION__,++f,__LINE__, 1);f--;}G_STMT_END
322 # define gtk_object_unref(o) G_STMT_START{static guint f=0;gtk_trace_referencing((gpointer)o,__PRETTY_FUNCTION__,++f,__LINE__, 0);f--;}G_STMT_END
323 #endif /* G_ENABLE_DEBUG && __GNUC__ */
329 #endif /* __cplusplus */
332 #endif /* __GTK_OBJECT_H__ */