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mutter/clutter/clutter-property-transition.c
Emmanuele Bassi b21cb29479 property-transition: Verify the interval on compute_value() 
By checking if the interval is valid inside compute_value() we can catch
the cases where the interval values of a PropertyTransition are set
after the transition has been added to an Animatable instance - i.e. the
following code:

  let transition = new Clutter.PropertyTransition();
  transition.set_property_name('opacity');
  actor.add_transition('opacityAnim', transition);
  transition.set_to_value(0);

should be equivalent to:

  let transition = new Clutter.PropertyTransition();
  transition.set_property_name('opacity');
  transition.set_to_value(0);
  actor.add_transition('opacityAnim', transition);

instead of emitting a warning.
2012-06-08 17:33:30 +01:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2012 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/>.
*/
/**
* SECTION:clutter-property-transition
* @Title: ClutterPropertyTransition
* @Short_Description: Property transitions
*
* #ClutterPropertyTransition is a specialized #ClutterTransition that
* can be used to tween a property of a #ClutterAnimatable instance.
*
* #ClutterPropertyTransition is available since Clutter 1.10
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-property-transition.h"
#include "clutter-animatable.h"
#include "clutter-debug.h"
#include "clutter-interval.h"
#include "clutter-private.h"
#include "clutter-transition.h"
struct _ClutterPropertyTransitionPrivate
{
char *property_name;
GParamSpec *pspec;
};
enum
{
PROP_0,
PROP_PROPERTY_NAME,
PROP_LAST
};
static GParamSpec *obj_props[PROP_LAST] = { NULL, };
G_DEFINE_TYPE (ClutterPropertyTransition, clutter_property_transition, CLUTTER_TYPE_TRANSITION)
static inline void
clutter_property_transition_ensure_interval (ClutterPropertyTransition *transition,
ClutterAnimatable *animatable,
ClutterInterval *interval)
{
ClutterPropertyTransitionPrivate *priv = transition->priv;
GValue *value_p;
if (clutter_interval_is_valid (interval))
return;
/* if no initial value has been set, use the current value */
value_p = clutter_interval_peek_initial_value (interval);
if (!G_IS_VALUE (value_p))
{
g_value_init (value_p, clutter_interval_get_value_type (interval));
clutter_animatable_get_initial_state (animatable,
priv->property_name,
value_p);
}
/* if no final value has been set, use the current value */
value_p = clutter_interval_peek_final_value (interval);
if (!G_IS_VALUE (value_p))
{
g_value_init (value_p, clutter_interval_get_value_type (interval));
clutter_animatable_get_initial_state (animatable,
priv->property_name,
value_p);
}
}
static void
clutter_property_transition_attached (ClutterTransition *transition,
ClutterAnimatable *animatable)
{
ClutterPropertyTransition *self = CLUTTER_PROPERTY_TRANSITION (transition);
ClutterPropertyTransitionPrivate *priv = self->priv;
ClutterInterval *interval;
if (priv->property_name == NULL)
return;
priv->pspec =
clutter_animatable_find_property (animatable, priv->property_name);
if (priv->pspec == NULL)
return;
interval = clutter_transition_get_interval (transition);
if (interval == NULL)
return;
clutter_property_transition_ensure_interval (self, animatable, interval);
}
static void
clutter_property_transition_detached (ClutterTransition *transition,
ClutterAnimatable *animatable)
{
ClutterPropertyTransition *self = CLUTTER_PROPERTY_TRANSITION (transition);
ClutterPropertyTransitionPrivate *priv = self->priv;
priv->pspec = NULL;
}
static void
clutter_property_transition_compute_value (ClutterTransition *transition,
ClutterAnimatable *animatable,
ClutterInterval *interval,
gdouble progress)
{
ClutterPropertyTransition *self = CLUTTER_PROPERTY_TRANSITION (transition);
ClutterPropertyTransitionPrivate *priv = self->priv;
GValue value = G_VALUE_INIT;
gboolean res;
/* if we have a GParamSpec we also have an animatable instance */
if (priv->pspec == NULL)
return;
clutter_property_transition_ensure_interval (self, animatable, interval);
g_value_init (&value, clutter_interval_get_value_type (interval));
res = clutter_animatable_interpolate_value (animatable,
priv->property_name,
interval,
progress,
&value);
if (res)
clutter_animatable_set_final_state (animatable,
priv->property_name,
&value);
g_value_unset (&value);
}
static void
clutter_property_transition_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterPropertyTransition *self = CLUTTER_PROPERTY_TRANSITION (gobject);
switch (prop_id)
{
case PROP_PROPERTY_NAME:
clutter_property_transition_set_property_name (self,
g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
clutter_property_transition_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterPropertyTransitionPrivate *priv = CLUTTER_PROPERTY_TRANSITION (gobject)->priv;
switch (prop_id)
{
case PROP_PROPERTY_NAME:
g_value_set_string (value, priv->property_name);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
clutter_property_transition_finalize (GObject *gobject)
{
ClutterPropertyTransitionPrivate *priv;
priv = CLUTTER_PROPERTY_TRANSITION (gobject)->priv;
g_free (priv->property_name);
G_OBJECT_CLASS (clutter_property_transition_parent_class)->finalize (gobject);
}
static void
clutter_property_transition_class_init (ClutterPropertyTransitionClass *klass)
{
ClutterTransitionClass *transition_class = CLUTTER_TRANSITION_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (ClutterPropertyTransitionPrivate));
transition_class->attached = clutter_property_transition_attached;
transition_class->detached = clutter_property_transition_detached;
transition_class->compute_value = clutter_property_transition_compute_value;
gobject_class->set_property = clutter_property_transition_set_property;
gobject_class->get_property = clutter_property_transition_get_property;
gobject_class->finalize = clutter_property_transition_finalize;
/**
* ClutterPropertyTransition:property-name:
*
* The name of the property of a #ClutterAnimatable to animate.
*
* Since: 1.10
*/
obj_props[PROP_PROPERTY_NAME] =
g_param_spec_string ("property-name",
P_("Property Name"),
P_("The name of the property to animate"),
NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, PROP_LAST, obj_props);
}
static void
clutter_property_transition_init (ClutterPropertyTransition *self)
{
self->priv =
G_TYPE_INSTANCE_GET_PRIVATE (self, CLUTTER_TYPE_PROPERTY_TRANSITION,
ClutterPropertyTransitionPrivate);
}
/**
* clutter_property_transition_new:
* @property_name: (allow-none): a property of @animatable, or %NULL
*
* Creates a new #ClutterPropertyTransition.
*
* Return value: (transfer full): the newly created #ClutterPropertyTransition.
* Use g_object_unref() when done
*
* Since: 1.10
*/
ClutterTransition *
clutter_property_transition_new (const char *property_name)
{
return g_object_new (CLUTTER_TYPE_PROPERTY_TRANSITION,
"property-name", property_name,
NULL);
}
/**
* clutter_property_transition_set_property_name:
* @transition: a #ClutterPropertyTransition
* @property_name: (allow-none): a property name
*
* Sets the #ClutterPropertyTransition:property-name property of @transition.
*
* Since: 1.10
*/
void
clutter_property_transition_set_property_name (ClutterPropertyTransition *transition,
const char *property_name)
{
ClutterPropertyTransitionPrivate *priv;
ClutterAnimatable *animatable;
g_return_if_fail (CLUTTER_IS_PROPERTY_TRANSITION (transition));
priv = transition->priv;
if (g_strcmp0 (priv->property_name, property_name) == 0)
return;
g_free (priv->property_name);
priv->property_name = g_strdup (property_name);
priv->pspec = NULL;
animatable =
clutter_transition_get_animatable (CLUTTER_TRANSITION (transition));
if (animatable != NULL)
{
priv->pspec = clutter_animatable_find_property (animatable,
priv->property_name);
}
g_object_notify_by_pspec (G_OBJECT (transition),
obj_props[PROP_PROPERTY_NAME]);
}
/**
* clutter_property_transition_get_property_name:
* @transition: a #ClutterPropertyTransition
*
* Retrieves the value of the #ClutterPropertyTransition:property-name
* property.
*
* Return value: the name of the property being animated, or %NULL if
* none is set. The returned string is owned by the @transition and
* it should not be freed.
*
* Since: 1.10
*/
const char *
clutter_property_transition_get_property_name (ClutterPropertyTransition *transition)
{
g_return_val_if_fail (CLUTTER_IS_PROPERTY_TRANSITION (transition), NULL);
return transition->priv->property_name;
}
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