/* GTK - The GIMP Toolkit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library 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. */ #ifndef __GTK_OBJECT_H__ #define __GTK_OBJECT_H__ #include #include #include #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ /* The debugging versions of the casting macros make sure the cast is "ok" * before proceeding, but they are definately slower than their less * careful counterparts as they involve no less than 3 function calls. */ #ifdef GTK_NO_CHECK_CASTS #define GTK_CHECK_CAST(obj,cast_type,cast) ((cast*) (obj)) #define GTK_CHECK_CLASS_CAST(klass,cast_type,cast) ((cast*) (klass)) #else /* !GTK_NO_CHECK_CASTS */ #define GTK_CHECK_CAST(obj,cast_type,cast) \ ((cast*) gtk_object_check_cast ((GtkObject*) (obj), (cast_type))) #define GTK_CHECK_CLASS_CAST(klass,cast_type,cast) \ ((cast*) gtk_object_check_class_cast ((GtkObjectClass*) (klass), (cast_type))) #endif /* GTK_NO_CHECK_CASTS */ /* Determines whether 'obj' is a type of 'otype'. */ #define GTK_CHECK_TYPE(obj,otype) (gtk_type_is_a (((GtkObject*) (obj))->klass->type, (otype))) /* Macro for casting a pointer to a GtkObject pointer. */ #define GTK_OBJECT(obj) GTK_CHECK_CAST ((obj), gtk_object_get_type (), GtkObject) /* Macros for extracting various fields from GtkObject and GtkObjectClass. */ #define GTK_OBJECT_CLASS(klass) (GTK_CHECK_CLASS_CAST ((klass), gtk_object_get_type (), GtkObjectClass)) #define GTK_OBJECT_TYPE(obj) (GTK_OBJECT (obj)->klass->type) #define GTK_OBJECT_SIGNALS(obj) (GTK_OBJECT (obj)->klass->signals) #define GTK_OBJECT_NSIGNALS(obj) (GTK_OBJECT (obj)->klass->nsignals) /* GtkObject only uses the first 4 bits of the flags field. * Derived objects may use the remaining bits. Though this * is a kinda nasty break up, it does make the size of * derived objects smaller. */ enum { GTK_DESTROYED = 1 << 0, GTK_FLOATING = 1 << 1, GTK_RESERVED_1 = 1 << 2, GTK_RESERVED_2 = 1 << 3, GTK_OBJECT_FLAG_LAST = GTK_RESERVED_2 }; /* GtkArg flag bits for gtk_object_add_arg_type */ enum { GTK_ARG_READABLE = 1 << 0, GTK_ARG_WRITABLE = 1 << 1, GTK_ARG_CONSTRUCT = 1 << 2 }; #define GTK_ARG_READWRITE (GTK_ARG_READABLE | GTK_ARG_WRITABLE) /* Macros for extracting the object_flags from GtkObject. */ #define GTK_OBJECT_FLAGS(obj) (GTK_OBJECT (obj)->flags) #define GTK_OBJECT_DESTROYED(obj) (GTK_OBJECT_FLAGS (obj) & GTK_DESTROYED) #define GTK_OBJECT_FLOATING(obj) (GTK_OBJECT_FLAGS (obj) & GTK_FLOATING) /* Macros for setting and clearing bits in the object_flags field of GtkObject. */ #define GTK_OBJECT_SET_FLAGS(obj,flag) G_STMT_START{ (GTK_OBJECT_FLAGS (obj) |= (flag)); }G_STMT_END #define GTK_OBJECT_UNSET_FLAGS(obj,flag) G_STMT_START{ (GTK_OBJECT_FLAGS (obj) &= ~(flag)); }G_STMT_END /* Macro for testing whether "obj" is of type GtkObject. */ #define GTK_IS_OBJECT(obj) (GTK_CHECK_TYPE ((obj), gtk_object_get_type ())) typedef struct _GtkObjectClass GtkObjectClass; /* GtkObject is the base of the object hierarchy. It defines * the few basic items that all derived classes contain. */ struct _GtkObject { /* A pointer to the objects class. This will actually point to * the derived objects class struct (which will be derived from * GtkObjectClass). */ GtkObjectClass *klass; /* 32 bits of flags. GtkObject only uses 4 of these bits and * GtkWidget uses the rest. This is done because structs are * aligned on 4 or 8 byte boundaries. If a new bitfield were * used in GtkWidget much space would be wasted. */ guint32 flags; /* reference count. * refer to the file REFCOUNTING on this issue. */ guint ref_count; /* The list of signal handlers and other data * fields for this object. */ gpointer object_data; }; /* GtkObjectClass is the base of the class hierarchy. It defines * the basic necessities for the class mechanism to work. Namely, * the "type", "signals" and "nsignals" fields. */ struct _GtkObjectClass { /* The type identifier for the objects class. There is * one unique identifier per class. */ GtkType type; /* The signals this object class handles. "signals" is an * array of signal ID's. */ guint *signals; /* The number of signals listed in "signals". */ guint nsignals; /* The number of arguments per class. */ guint n_args; /* The functions that will end an objects life time. In one way ore * another all three of them are defined for all objects. If an * object class overrides one of the methods in order to perform class * specific destruction then it must still invoke its superclass' * implementation of the method after it is finished with its * own cleanup. (See the destroy function for GtkWidget for * an example of how to do this). */ void (* shutdown) (GtkObject *object); void (* destroy) (GtkObject *object); void (* finalize) (GtkObject *object); }; /* For the purpose of user signals we need the signal function * and signal marshaller signatures already in this place. */ #define GTK_SIGNAL_FUNC(f) ((GtkSignalFunc) f) typedef void (*GtkSignalFunc) (void); typedef void (*GtkSignalMarshaller) (GtkObject *object, GtkSignalFunc func, gpointer func_data, GtkArg *args); /* Get the type identifier for GtkObject's. */ guint gtk_object_get_type (void); /* Append "signals" to those already defined in "class". */ void gtk_object_class_add_signals (GtkObjectClass *klass, guint *signals, guint nsignals); /* Append a user defined signal without default handler to a class. */ guint gtk_object_class_add_user_signal (GtkObjectClass *klass, const gchar *name, GtkSignalMarshaller marshaller, GtkType return_val, guint nparams, ...); GtkObject* gtk_object_new (GtkType type, ...); GtkObject* gtk_object_newv (GtkType type, guint nargs, GtkArg *args); void gtk_object_sink (GtkObject *object); void gtk_object_ref (GtkObject *object); void gtk_object_unref (GtkObject *object); void gtk_object_weakref (GtkObject *object, GtkDestroyNotify notify, gpointer data); void gtk_object_weakunref (GtkObject *object, GtkDestroyNotify notify, gpointer data); void gtk_object_destroy (GtkObject *object); /* gtk_object_getv() sets an arguments type and value, or just * its type to GTK_TYPE_INVALID. * if arg->type == GTK_TYPE_STRING, it's the callers response to * do a g_free (GTK_VALUE_STRING (arg)); */ void gtk_object_getv (GtkObject *object, guint nargs, GtkArg *args); /* gtk_object_set() takes a variable argument list of the form: * (..., gchar *arg_name, ARG_VALUES, [repeatedly name/value pairs,] NULL) * where ARG_VALUES type depend on the argument and can consist of * more than one c-function argument. */ void gtk_object_set (GtkObject *object, ...); void gtk_object_setv (GtkObject *object, guint nargs, GtkArg *args); /* Allocate a GtkArg array of size nargs that hold the * names and types of the args that can be used with * gtk_object_set/gtk_object_get. if (arg_flags!=NULL), * (*arg_flags) will be set to point to a newly allocated * guint array that holds the flags of the args. * It is the callers response to do a * g_free (returned_args); g_free (*acess_masks). */ GtkArg* gtk_object_query_args (GtkType class_type, guint32 **arg_flags, guint *nargs); void gtk_object_add_arg_type (const gchar *arg_name, GtkType arg_type, guint arg_flags, guint arg_id); GtkType gtk_object_get_arg_type (const gchar *arg_name); /* Set 'data' to the "object_data" field of the object. The * data is indexed by the "key". If there is already data * associated with "key" then the new data will replace it. * If 'data' is NULL then this call is equivalent to * 'gtk_object_remove_data'. */ void gtk_object_set_data (GtkObject *object, const gchar *key, gpointer data); /* Like gtk_object_set_data, but takes an additional argument * which is a function to be called when the data is removed. */ void gtk_object_set_data_full (GtkObject *object, const gchar *key, gpointer data, GtkDestroyNotify destroy); /* Get the data associated with "key". */ gpointer gtk_object_get_data (GtkObject *object, const gchar *key); /* Remove the data associated with "key". This call is * equivalent to 'gtk_object_set_data' where 'data' is NULL. */ void gtk_object_remove_data (GtkObject *object, const gchar *key); /* Object data functions that operate on key ids. * These functions are meant for *internal* use only. */ void gtk_object_set_data_by_id (GtkObject *object, guint data_id, gpointer data); void gtk_object_set_data_by_id_full (GtkObject *object, guint data_id, gpointer data, GtkDestroyNotify destroy); gpointer gtk_object_get_data_by_id (GtkObject *object, guint data_id); void gtk_object_remove_data_by_id (GtkObject *object, guint data_id); guint gtk_object_data_try_key (const gchar *key); guint gtk_object_data_force_id (const gchar *key); /* Set the "user_data" object data field of "object". It should * be noted that this is no different than calling 'gtk_object_set_data' * with a key of "user_data". It is merely provided as a convenience. */ void gtk_object_set_user_data (GtkObject *object, gpointer data); /* Get the "user_data" object data field of "object". It should * be noted that this is no different than calling 'gtk_object_get_data' * with a key of "user_data". It is merely provided as a convenience. */ gpointer gtk_object_get_user_data (GtkObject *object); GtkObject* gtk_object_check_cast (GtkObject *obj, GtkType cast_type); GtkObjectClass* gtk_object_check_class_cast (GtkObjectClass *klass, GtkType cast_type); void gtk_trace_referencing (gpointer *object, const gchar *func, guint local_frame, guint line, gboolean do_ref); #if G_ENABLE_DEBUG && defined (__GNUC__) # 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 # 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 #endif /* G_ENABLE_DEBUG && __GNUC__ */ #ifdef __cplusplus } #endif /* __cplusplus */ #endif /* __GTK_OBJECT_H__ */