6fff1bcdc6
The Animatable interface implementation will always have the computed value applied, whilst the non-Animatable objects go through the interval validation first to avoid incurring in assertions and warnings. The Animatable::animate_property() should also be able to validate the property it's supposed to interpolate, and eventually discard it. This requires adding a return value to the virtual function (and its wrapper function). The Animation code will then apply the computed value only if the animate_property() returns TRUE -- unifying the code path with the non-Animatable objects.
127 lines
4.8 KiB
C
127 lines
4.8 KiB
C
/*
|
|
* Clutter.
|
|
*
|
|
* An OpenGL based 'interactive canvas' library.
|
|
*
|
|
* Copyright (C) 2009 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>
|
|
*/
|
|
|
|
/**
|
|
* SECTION:clutter-animatable
|
|
* @short_description: Interface for animatable classes
|
|
*
|
|
* #ClutterAnimatable is an interface that allows a #GObject class
|
|
* to control how a #ClutterAnimation will animate a property.
|
|
*
|
|
* Each #ClutterAnimatable should implement the animate_property()
|
|
* virtual function of the interface to compute the animation state
|
|
* between two values of an interval depending on a progress factor,
|
|
* expressed as a floating point value.
|
|
*
|
|
* If a #ClutterAnimatable is animated by a #ClutterAnimation
|
|
* instance, the #ClutterAnimation will call
|
|
* clutter_animatable_animate_property() passing the name of the
|
|
* currently animated property; the initial and final values of
|
|
* the animation interval; the progress factor. The #ClutterAnimatable
|
|
* implementation should return the computed value for the animated
|
|
* property.
|
|
*
|
|
* #ClutterAnimatable is available since Clutter 1.0
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "clutter-animatable.h"
|
|
#include "clutter-debug.h"
|
|
#include "clutter-private.h"
|
|
|
|
GType
|
|
clutter_animatable_get_type (void)
|
|
{
|
|
static GType a_type = 0;
|
|
|
|
if (G_UNLIKELY (a_type == 0))
|
|
a_type = g_type_register_static_simple (G_TYPE_INTERFACE,
|
|
I_("ClutterAnimatable"),
|
|
sizeof (ClutterAnimatableIface),
|
|
NULL, 0, NULL, 0);
|
|
|
|
return a_type;
|
|
}
|
|
|
|
/**
|
|
* clutter_animatable_animate_property:
|
|
* @animatable: a #ClutterAnimatable
|
|
* @animation: a #ClutterAnimation
|
|
* @property_name: the name of the animated property
|
|
* @initial_value: the initial value of the animation interval
|
|
* @final_value: the final value of the animation interval
|
|
* @progress: the progress factor
|
|
* @value: return location for the animation value
|
|
*
|
|
* Calls the animate_property() virtual function for @animatable.
|
|
*
|
|
* The @initial_value and @final_value #GValue<!-- -->s must contain
|
|
* the same type; @value must have been initialized to the same
|
|
* type of @initial_value and @final_value.
|
|
*
|
|
* All implementation of the #ClutterAnimatable interface must
|
|
* implement this function.
|
|
*
|
|
* Return value: %TRUE if the value has been validated and can
|
|
* be applied to the #ClutterAnimatable, and %FALSE otherwise
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
gboolean
|
|
clutter_animatable_animate_property (ClutterAnimatable *animatable,
|
|
ClutterAnimation *animation,
|
|
const gchar *property_name,
|
|
const GValue *initial_value,
|
|
const GValue *final_value,
|
|
gdouble progress,
|
|
GValue *value)
|
|
{
|
|
gboolean res;
|
|
|
|
g_return_val_if_fail (CLUTTER_IS_ANIMATABLE (animatable), FALSE);
|
|
g_return_val_if_fail (CLUTTER_IS_ANIMATION (animation), FALSE);
|
|
g_return_val_if_fail (property_name != NULL, FALSE);
|
|
g_return_val_if_fail (initial_value != NULL && final_value != NULL, FALSE);
|
|
g_return_val_if_fail (G_VALUE_TYPE (initial_value) != G_TYPE_INVALID, FALSE);
|
|
g_return_val_if_fail (G_VALUE_TYPE (final_value) != G_TYPE_INVALID, FALSE);
|
|
g_return_val_if_fail (value != NULL, FALSE);
|
|
g_return_val_if_fail (G_VALUE_TYPE (value) == G_VALUE_TYPE (initial_value) &&
|
|
G_VALUE_TYPE (value) == G_VALUE_TYPE (final_value),
|
|
FALSE);
|
|
|
|
res =
|
|
CLUTTER_ANIMATABLE_GET_IFACE (animatable)->animate_property (animatable,
|
|
animation,
|
|
property_name,
|
|
initial_value,
|
|
final_value,
|
|
progress,
|
|
value);
|
|
|
|
return res;
|
|
}
|