28b0f432b7
A ClutterInterval can change the way the progress is computed by subclassing and overriding the ::compute_value() virtual function. It should also be possible to register a custom progress function in the same way it is possible to register a custom transformation function between two GValues. This commit adds an internal, global hash table that maintains a GType <-> progress function association; each ClutterInterval will check if there is a progress function registered for the GType of the initial and final values of the interval and, if it has been found, it will call it to compute the value of the interval depending on the progress factor.
163 lines
6.4 KiB
C
163 lines
6.4 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Copyright (C) 2008 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author:
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* Emmanuele Bassi <ebassi@linux.intel.com>
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*/
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#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <clutter/clutter.h> can be included directly."
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#endif
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#ifndef __CLUTTER_INTERVAL_H__
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#define __CLUTTER_INTERVAL_H__
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#include <glib-object.h>
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_INTERVAL (clutter_interval_get_type ())
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#define CLUTTER_INTERVAL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_INTERVAL, ClutterInterval))
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#define CLUTTER_IS_INTERVAL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_INTERVAL))
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#define CLUTTER_INTERVAL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_INTERVAL, ClutterIntervalClass))
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#define CLUTTER_IS_INTERVAL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_INTERVAL))
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#define CLUTTER_INTERVAL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_INTERVAL, ClutterIntervalClass))
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typedef struct _ClutterInterval ClutterInterval;
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typedef struct _ClutterIntervalPrivate ClutterIntervalPrivate;
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typedef struct _ClutterIntervalClass ClutterIntervalClass;
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/**
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* ClutterProgressFunc:
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* @a: the initial value of an interval
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* @b: the final value of an interval
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* @progress: the progress factor, between 0 and 1
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* @retval: the value used to store the progress
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*
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* Prototype of the progress function used to compute the value
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* between the two ends @a and @b of an interval depending on
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* the value of @progress.
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*
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* The #GValue in @retval is already initialized with the same
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* type as @a and @b.
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*
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* This function will be called by #ClutterInterval if the
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* type of the values of the interval was registered using
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* clutter_interval_register_progress_func().
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*
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* Return value: %TRUE if the function successfully computed
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* the value and stored it inside @retval
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*
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* Since: 1.0
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*/
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typedef gboolean (* ClutterProgressFunc) (const GValue *a,
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const GValue *b,
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gdouble progress,
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GValue *retval);
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/**
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* ClutterInterval:
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*
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* The #ClutterInterval structure contains only private data and should
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* be accessed using the provided functions.
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*
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* Since: 1.0
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*/
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struct _ClutterInterval
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{
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/*< private >*/
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GInitiallyUnowned parent_instance;
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ClutterIntervalPrivate *priv;
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};
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/**
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* ClutterIntervalClass:
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* @validate: virtual function for validating an interval
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* using a #GParamSpec
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* @compute_value: virtual function for computing the value
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* inside an interval using an adimensional factor between 0 and 1
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*
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* The #ClutterIntervalClass contains only private data.
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*
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* Since: 1.0
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*/
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struct _ClutterIntervalClass
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{
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/*< private >*/
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GInitiallyUnownedClass parent_class;
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/*< public >*/
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gboolean (* validate) (ClutterInterval *interval,
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GParamSpec *pspec);
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gboolean (* compute_value) (ClutterInterval *interval,
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gdouble factor,
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GValue *value);
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/*< private >*/
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/* padding for future expansion */
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void (*_clutter_reserved1) (void);
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void (*_clutter_reserved2) (void);
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void (*_clutter_reserved3) (void);
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void (*_clutter_reserved4) (void);
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void (*_clutter_reserved5) (void);
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void (*_clutter_reserved6) (void);
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};
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GType clutter_interval_get_type (void) G_GNUC_CONST;
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ClutterInterval *clutter_interval_new (GType gtype,
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...);
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ClutterInterval *clutter_interval_new_with_values (GType gtype,
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const GValue *initial,
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const GValue *final);
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ClutterInterval *clutter_interval_clone (ClutterInterval *interval);
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GType clutter_interval_get_value_type (ClutterInterval *interval);
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void clutter_interval_set_initial_value (ClutterInterval *interval,
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const GValue *value);
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void clutter_interval_get_initial_value (ClutterInterval *interval,
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GValue *value);
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GValue * clutter_interval_peek_initial_value (ClutterInterval *interval);
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void clutter_interval_set_final_value (ClutterInterval *interval,
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const GValue *value);
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void clutter_interval_get_final_value (ClutterInterval *interval,
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GValue *value);
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GValue * clutter_interval_peek_final_value (ClutterInterval *interval);
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void clutter_interval_set_interval (ClutterInterval *interval,
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...);
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void clutter_interval_get_interval (ClutterInterval *interval,
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...);
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gboolean clutter_interval_validate (ClutterInterval *interval,
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GParamSpec *pspec);
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gboolean clutter_interval_compute_value (ClutterInterval *interval,
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gdouble factor,
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GValue *value);
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void clutter_interval_register_progress_func (GType value_type,
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ClutterProgressFunc func);
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G_END_DECLS
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#endif /* __CLUTTER_INTERVAL_H__ */
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