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.
126 lines
4.8 KiB
C
126 lines
4.8 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) 2009 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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/**
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* SECTION:clutter-animatable
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* @short_description: Interface for animatable classes
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*
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* #ClutterAnimatable is an interface that allows a #GObject class
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* to control how a #ClutterAnimation will animate a property.
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*
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* Each #ClutterAnimatable should implement the animate_property()
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* virtual function of the interface to compute the animation state
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* between two values of an interval depending on a progress factor,
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* expressed as a floating point value.
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*
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* If a #ClutterAnimatable is animated by a #ClutterAnimation
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* instance, the #ClutterAnimation will call
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* clutter_animatable_animate_property() passing the name of the
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* currently animated property; the initial and final values of
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* the animation interval; the progress factor. The #ClutterAnimatable
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* implementation should return the computed value for the animated
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* property.
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*
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* #ClutterAnimatable is available since Clutter 1.0
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "clutter-animatable.h"
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#include "clutter-debug.h"
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#include "clutter-private.h"
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GType
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clutter_animatable_get_type (void)
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{
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static GType a_type = 0;
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if (G_UNLIKELY (a_type == 0))
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a_type = g_type_register_static_simple (G_TYPE_INTERFACE,
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I_("ClutterAnimatable"),
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sizeof (ClutterAnimatableIface),
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NULL, 0, NULL, 0);
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return a_type;
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}
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/**
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* clutter_animatable_animate_property:
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* @animatable: a #ClutterAnimatable
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* @animation: a #ClutterAnimation
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* @property_name: the name of the animated property
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* @initial_value: the initial value of the animation interval
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* @final_value: the final value of the animation interval
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* @progress: the progress factor
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* @value: return location for the animation value
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*
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* Calls the animate_property() virtual function for @animatable.
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*
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* The @initial_value and @final_value #GValue<!-- -->s must contain
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* the same type; @value must have been initialized to the same
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* type of @initial_value and @final_value.
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*
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* All implementation of the #ClutterAnimatable interface must
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* implement this function.
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*
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* Return value: %TRUE if the value has been validated and can
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* be applied to the #ClutterAnimatable, and %FALSE otherwise
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*
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* Since: 1.0
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*/
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gboolean
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clutter_animatable_animate_property (ClutterAnimatable *animatable,
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ClutterAnimation *animation,
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const gchar *property_name,
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const GValue *initial_value,
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const GValue *final_value,
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gdouble progress,
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GValue *value)
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{
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gboolean res;
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g_return_val_if_fail (CLUTTER_IS_ANIMATABLE (animatable), FALSE);
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g_return_val_if_fail (CLUTTER_IS_ANIMATION (animation), FALSE);
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g_return_val_if_fail (property_name != NULL, FALSE);
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g_return_val_if_fail (initial_value != NULL && final_value != NULL, FALSE);
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g_return_val_if_fail (G_VALUE_TYPE (initial_value) != G_TYPE_INVALID, FALSE);
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g_return_val_if_fail (G_VALUE_TYPE (final_value) != G_TYPE_INVALID, FALSE);
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g_return_val_if_fail (value != NULL, FALSE);
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g_return_val_if_fail (G_VALUE_TYPE (value) == G_VALUE_TYPE (initial_value) &&
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G_VALUE_TYPE (value) == G_VALUE_TYPE (final_value),
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FALSE);
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res =
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CLUTTER_ANIMATABLE_GET_IFACE (animatable)->animate_property (animatable,
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animation,
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property_name,
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initial_value,
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final_value,
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progress,
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value);
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return res;
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}
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