PIKApp/libpikamodule/pikamodule.h

215 lines
6.7 KiB
C

/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* pikamodule.h
* (C) 1999 Austin Donnelly <austin@gimp.org>
*
* 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 3 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, see
* <https://www.gnu.org/licenses/>.
*/
#ifndef __PIKA_MODULE_H__
#define __PIKA_MODULE_H__
#include <gio/gio.h>
#include <gmodule.h>
#define __PIKA_MODULE_H_INSIDE__
#include <libpikamodule/pikamoduletypes.h>
#include <libpikamodule/pikamoduledb.h>
#undef __PIKA_MODULE_H_INSIDE__
G_BEGIN_DECLS
/**
* PIKA_MODULE_ABI_VERSION:
*
* The version of the module system's ABI. Modules put this value into
* #PikaModuleInfo's @abi_version field so the code loading the modules
* can check if it was compiled against the same module ABI the modules
* are compiled against.
*
* PIKA_MODULE_ABI_VERSION is incremented each time one of the
* following changes:
*
* - the libpikamodule implementation (if the change affects modules).
*
* - one of the classes implemented by modules (currently #PikaColorDisplay,
* #PikaColorSelector and #PikaController).
**/
#define PIKA_MODULE_ABI_VERSION 0x0005
/**
* PikaModuleState:
* @PIKA_MODULE_STATE_ERROR: Missing pika_module_register() function
* or other error.
* @PIKA_MODULE_STATE_LOADED: An instance of a type implemented by
* this module is allocated.
* @PIKA_MODULE_STATE_LOAD_FAILED: pika_module_register() returned %FALSE.
* @PIKA_MODULE_STATE_NOT_LOADED: There are no instances allocated of
* types implemented by this module.
*
* The possible states a #PikaModule can be in.
**/
typedef enum
{
PIKA_MODULE_STATE_ERROR,
PIKA_MODULE_STATE_LOADED,
PIKA_MODULE_STATE_LOAD_FAILED,
PIKA_MODULE_STATE_NOT_LOADED
} PikaModuleState;
#define PIKA_MODULE_ERROR (pika_module_error_quark ())
GQuark pika_module_error_quark (void) G_GNUC_CONST;
/**
* PikaModuleError:
* @PIKA_MODULE_FAILED: Generic error condition
*
* Types of errors returned by modules
**/
typedef enum
{
PIKA_MODULE_FAILED
} PikaModuleError;
/**
* PikaModuleInfo:
* @abi_version: The #PIKA_MODULE_ABI_VERSION the module was compiled against.
* @purpose: The module's general purpose.
* @author: The module's author.
* @version: The module's version.
* @copyright: The module's copyright.
* @date: The module's release date.
*
* This structure contains information about a loadable module.
**/
struct _PikaModuleInfo
{
guint32 abi_version;
gchar *purpose;
gchar *author;
gchar *version;
gchar *copyright;
gchar *date;
};
/**
* PikaModuleQueryFunc:
* @module: The module responsible for this loadable module.
*
* The signature of the query function a loadable PIKA module must
* implement. In the module, the function must be called [func@Module.query].
*
* [class@Module] will copy the returned [struct@ModuleInfo], so the
* module doesn't need to keep these values around (however in most
* cases the module will just return a pointer to a constant
* structure).
*
* Returns: The info struct describing the module.
**/
typedef const PikaModuleInfo * (* PikaModuleQueryFunc) (GTypeModule *module);
/**
* PikaModuleRegisterFunc:
* @module: The module responsible for this loadable module.
*
* The signature of the register function a loadable PIKA module must
* implement. In the module, the function must be called
* [func@Module.register].
*
* When this function is called, the module should register all the types
* it implements with the passed @module.
*
* Returns: Whether the registration was succesfull
**/
typedef gboolean (* PikaModuleRegisterFunc) (GTypeModule *module);
/* PikaModules have to implement these */
G_MODULE_EXPORT const PikaModuleInfo * pika_module_query (GTypeModule *module);
G_MODULE_EXPORT gboolean pika_module_register (GTypeModule *module);
#define PIKA_TYPE_MODULE (pika_module_get_type ())
#define PIKA_MODULE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), PIKA_TYPE_MODULE, PikaModule))
#define PIKA_MODULE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PIKA_TYPE_MODULE, PikaModuleClass))
#define PIKA_IS_MODULE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), PIKA_TYPE_MODULE))
#define PIKA_IS_MODULE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PIKA_TYPE_MODULE))
#define PIKA_MODULE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PIKA_TYPE_MODULE, PikaModuleClass))
typedef struct _PikaModulePrivate PikaModulePrivate;
typedef struct _PikaModuleClass PikaModuleClass;
struct _PikaModule
{
GTypeModule parent_instance;
PikaModulePrivate *priv;
};
struct _PikaModuleClass
{
GTypeModuleClass parent_class;
void (* modified) (PikaModule *module);
/* Padding for future expansion */
void (* _pika_reserved1) (void);
void (* _pika_reserved2) (void);
void (* _pika_reserved3) (void);
void (* _pika_reserved4) (void);
void (* _pika_reserved5) (void);
void (* _pika_reserved6) (void);
void (* _pika_reserved7) (void);
void (* _pika_reserved8) (void);
};
GType pika_module_get_type (void) G_GNUC_CONST;
PikaModule * pika_module_new (GFile *file,
gboolean auto_load,
gboolean verbose);
GFile * pika_module_get_file (PikaModule *module);
void pika_module_set_auto_load (PikaModule *module,
gboolean auto_load);
gboolean pika_module_get_auto_load (PikaModule *module);
gboolean pika_module_is_on_disk (PikaModule *module);
gboolean pika_module_is_loaded (PikaModule *module);
const PikaModuleInfo * pika_module_get_info (PikaModule *module);
PikaModuleState pika_module_get_state (PikaModule *module);
const gchar * pika_module_get_last_error (PikaModule *module);
gboolean pika_module_query_module (PikaModule *module);
G_END_DECLS
#endif /* __PIKA_MODULE_H__ */