af84d97fca
ClutterInterval.compute_value() computes the new value given a progress and copies it to a given GValue. Since most of the time we want to pass that very same value to another function that copies it again, we should have a compute_value() variant that stores that computed value inside ClutterInterval and returns a pointer to it. This way we initialize the result GValue just once and we never copy it, as long as the Interval instance is valid.
166 lines
6.5 KiB
C
166 lines
6.5 KiB
C
/*
|
|
* Clutter.
|
|
*
|
|
* An OpenGL based 'interactive canvas' library.
|
|
*
|
|
* Copyright (C) 2008 Intel Corporation.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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 <http://www.gnu.org/licenses/>.
|
|
*
|
|
* Author:
|
|
* Emmanuele Bassi <ebassi@linux.intel.com>
|
|
*/
|
|
|
|
#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
|
|
#error "Only <clutter/clutter.h> can be included directly."
|
|
#endif
|
|
|
|
#ifndef __CLUTTER_INTERVAL_H__
|
|
#define __CLUTTER_INTERVAL_H__
|
|
|
|
#include <glib-object.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
#define CLUTTER_TYPE_INTERVAL (clutter_interval_get_type ())
|
|
#define CLUTTER_INTERVAL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_INTERVAL, ClutterInterval))
|
|
#define CLUTTER_IS_INTERVAL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_INTERVAL))
|
|
#define CLUTTER_INTERVAL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_INTERVAL, ClutterIntervalClass))
|
|
#define CLUTTER_IS_INTERVAL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_INTERVAL))
|
|
#define CLUTTER_INTERVAL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_INTERVAL, ClutterIntervalClass))
|
|
|
|
typedef struct _ClutterInterval ClutterInterval;
|
|
typedef struct _ClutterIntervalPrivate ClutterIntervalPrivate;
|
|
typedef struct _ClutterIntervalClass ClutterIntervalClass;
|
|
|
|
/**
|
|
* ClutterProgressFunc:
|
|
* @a: the initial value of an interval
|
|
* @b: the final value of an interval
|
|
* @progress: the progress factor, between 0 and 1
|
|
* @retval: the value used to store the progress
|
|
*
|
|
* Prototype of the progress function used to compute the value
|
|
* between the two ends @a and @b of an interval depending on
|
|
* the value of @progress.
|
|
*
|
|
* The #GValue in @retval is already initialized with the same
|
|
* type as @a and @b.
|
|
*
|
|
* This function will be called by #ClutterInterval if the
|
|
* type of the values of the interval was registered using
|
|
* clutter_interval_register_progress_func().
|
|
*
|
|
* Return value: %TRUE if the function successfully computed
|
|
* the value and stored it inside @retval
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
typedef gboolean (* ClutterProgressFunc) (const GValue *a,
|
|
const GValue *b,
|
|
gdouble progress,
|
|
GValue *retval);
|
|
|
|
/**
|
|
* ClutterInterval:
|
|
*
|
|
* The #ClutterInterval structure contains only private data and should
|
|
* be accessed using the provided functions.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
struct _ClutterInterval
|
|
{
|
|
/*< private >*/
|
|
GInitiallyUnowned parent_instance;
|
|
|
|
ClutterIntervalPrivate *priv;
|
|
};
|
|
|
|
/**
|
|
* ClutterIntervalClass:
|
|
* @validate: virtual function for validating an interval
|
|
* using a #GParamSpec
|
|
* @compute_value: virtual function for computing the value
|
|
* inside an interval using an adimensional factor between 0 and 1
|
|
*
|
|
* The #ClutterIntervalClass contains only private data.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
struct _ClutterIntervalClass
|
|
{
|
|
/*< private >*/
|
|
GInitiallyUnownedClass parent_class;
|
|
|
|
/*< public >*/
|
|
gboolean (* validate) (ClutterInterval *interval,
|
|
GParamSpec *pspec);
|
|
gboolean (* compute_value) (ClutterInterval *interval,
|
|
gdouble factor,
|
|
GValue *value);
|
|
|
|
/*< private >*/
|
|
/* padding for future expansion */
|
|
void (*_clutter_reserved1) (void);
|
|
void (*_clutter_reserved2) (void);
|
|
void (*_clutter_reserved3) (void);
|
|
void (*_clutter_reserved4) (void);
|
|
void (*_clutter_reserved5) (void);
|
|
void (*_clutter_reserved6) (void);
|
|
};
|
|
|
|
GType clutter_interval_get_type (void) G_GNUC_CONST;
|
|
|
|
ClutterInterval *clutter_interval_new (GType gtype,
|
|
...);
|
|
ClutterInterval *clutter_interval_new_with_values (GType gtype,
|
|
const GValue *initial,
|
|
const GValue *final);
|
|
|
|
ClutterInterval *clutter_interval_clone (ClutterInterval *interval);
|
|
|
|
GType clutter_interval_get_value_type (ClutterInterval *interval);
|
|
void clutter_interval_set_initial_value (ClutterInterval *interval,
|
|
const GValue *value);
|
|
void clutter_interval_get_initial_value (ClutterInterval *interval,
|
|
GValue *value);
|
|
GValue * clutter_interval_peek_initial_value (ClutterInterval *interval);
|
|
void clutter_interval_set_final_value (ClutterInterval *interval,
|
|
const GValue *value);
|
|
void clutter_interval_get_final_value (ClutterInterval *interval,
|
|
GValue *value);
|
|
GValue * clutter_interval_peek_final_value (ClutterInterval *interval);
|
|
|
|
void clutter_interval_set_interval (ClutterInterval *interval,
|
|
...);
|
|
void clutter_interval_get_interval (ClutterInterval *interval,
|
|
...);
|
|
|
|
gboolean clutter_interval_validate (ClutterInterval *interval,
|
|
GParamSpec *pspec);
|
|
gboolean clutter_interval_compute_value (ClutterInterval *interval,
|
|
gdouble factor,
|
|
GValue *value);
|
|
|
|
G_CONST_RETURN GValue *clutter_interval_compute (ClutterInterval *interval,
|
|
gdouble factor);
|
|
|
|
void clutter_interval_register_progress_func (GType value_type,
|
|
ClutterProgressFunc func);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __CLUTTER_INTERVAL_H__ */
|