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/** \file
* \brief Context callback operation functions.
*
* \author Copyright 2001 Lutz Mueller <lutz@users.sourceforge.net>
*
* \note
* 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.
*
* \note
* 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.
*
* \note
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#ifndef LIBGPHOTO2_GPHOTO2_CONTEXT_H
#define LIBGPHOTO2_GPHOTO2_CONTEXT_H
#include <stdarg.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* \brief The gphoto context structure.
*
* This structure allows callback handling, passing error contexts back,
* progress handling and download cancellation and similar things.
* It is usually passed around the functions.
*/
typedef struct _GPContext GPContext;
GPContext *gp_context_new (void);
void gp_context_ref (GPContext *context);
void gp_context_unref (GPContext *context);
/**
* \brief Return codes that can be returned by progress handling.
*
* An application can return special values back to the libgphoto2
* progress callback handling functions. If "Cancel" is selected,
* libgphoto2 and the camera driver will try to cancel transfer.
*/
typedef enum _GPContextFeedback {
GP_CONTEXT_FEEDBACK_OK, /**< Everything ok... proceed. */
GP_CONTEXT_FEEDBACK_CANCEL /**< Please cancel the current transfer if possible. */
} GPContextFeedback;
/* Functions */
typedef void (* GPContextIdleFunc) (GPContext *context, void *data);
typedef void (* GPContextErrorFunc) (GPContext *context, const char *text, void *data);
typedef void (* GPContextStatusFunc) (GPContext *context, const char *text, void *data);
typedef void (* GPContextMessageFunc) (GPContext *context, const char *text, void *data);
typedef GPContextFeedback (* GPContextQuestionFunc) (GPContext *context,
const char *text, void *data);
typedef GPContextFeedback (* GPContextCancelFunc) (GPContext *context,
void *data);
typedef unsigned int (* GPContextProgressStartFunc) (GPContext *context,
float target,
const char *text,
void *data);
typedef void (* GPContextProgressUpdateFunc) (GPContext *context,
unsigned int id,
float current,
void *data);
typedef void (* GPContextProgressStopFunc) (GPContext *context,
unsigned int id,
void *data);
/* Setting those functions (frontends) */
void gp_context_set_idle_func (GPContext *context,
GPContextIdleFunc func, void *data);
void gp_context_set_progress_funcs (GPContext *context,
GPContextProgressStartFunc start_func,
GPContextProgressUpdateFunc update_func,
GPContextProgressStopFunc stop_func,
void *data);
void gp_context_set_error_func (GPContext *context,
GPContextErrorFunc func, void *data);
void gp_context_set_status_func (GPContext *context,
GPContextStatusFunc func, void *data);
void gp_context_set_question_func (GPContext *context,
GPContextQuestionFunc func, void *data);
void gp_context_set_cancel_func (GPContext *context,
GPContextCancelFunc func, void *data);
void gp_context_set_message_func (GPContext *context,
GPContextMessageFunc func, void *data);
/* Calling those functions (backends) */
void gp_context_idle (GPContext *context);
void gp_context_error (GPContext *context, const char *format, ...)
#ifdef __GNUC__
__attribute__((__format__(printf,2,3)))
#endif
;
void gp_context_status (GPContext *context, const char *format, ...)
#ifdef __GNUC__
__attribute__((__format__(printf,2,3)))
#endif
;
void gp_context_message (GPContext *context, const char *format, ...)
#ifdef __GNUC__
__attribute__((__format__(printf,2,3)))
#endif
;
GPContextFeedback gp_context_question (GPContext *context, const char *format,
...)
#ifdef __GNUC__
__attribute__((__format__(printf,2,3)))
#endif
;
GPContextFeedback gp_context_cancel (GPContext *context);
unsigned int gp_context_progress_start (GPContext *context, float target,
const char *format, ...)
#ifdef __GNUC__
__attribute__((__format__(printf,3,4)))
#endif
;
void gp_context_progress_update (GPContext *context, unsigned int id,
float current);
void gp_context_progress_stop (GPContext *context, unsigned int id);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* !defined(LIBGPHOTO2_GPHOTO2_CONTEXT_H) */
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