7660f5d0c6
Once a ClutterPropertyTransition is attached to a ClutterAnimatable, if no interval is set we can simply use the current state of the property to define the from and to values. This allows the creation of property transitions from the current state of the Animatable instance without excessive verbosity.
687 lines
20 KiB
C
687 lines
20 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) 2012 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: Emmanuele Bassi <ebassi@linux.intel.com>
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*/
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/**
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* SECTION:clutter-transition
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* @Title: ClutterTransition
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* @Short_Description: Transition between two values
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*
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* #ClutterTransition is a subclass of #ClutterTimeline that computes
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* the interpolation between two values, stored by a #ClutterInterval.
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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-transition.h"
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#include "clutter-animatable.h"
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#include "clutter-debug.h"
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#include "clutter-interval.h"
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#include "clutter-private.h"
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#include "clutter-timeline.h"
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#include <gobject/gvaluecollector.h>
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struct _ClutterTransitionPrivate
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{
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ClutterInterval *interval;
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ClutterAnimatable *animatable;
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guint remove_on_complete : 1;
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};
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enum
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{
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PROP_0,
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PROP_INTERVAL,
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PROP_ANIMATABLE,
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PROP_REMOVE_ON_COMPLETE,
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PROP_LAST
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};
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static GParamSpec *obj_props[PROP_LAST] = { NULL, };
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static GQuark quark_animatable_set = 0;
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G_DEFINE_ABSTRACT_TYPE (ClutterTransition, clutter_transition, CLUTTER_TYPE_TIMELINE)
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static void
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clutter_transition_attach (ClutterTransition *transition,
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ClutterAnimatable *animatable)
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{
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CLUTTER_TRANSITION_GET_CLASS (transition)->attached (transition, animatable);
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}
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static void
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clutter_transition_detach (ClutterTransition *transition,
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ClutterAnimatable *animatable)
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{
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CLUTTER_TRANSITION_GET_CLASS (transition)->detached (transition, animatable);
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}
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static void
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clutter_transition_real_compute_value (ClutterTransition *transition,
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ClutterAnimatable *animatable,
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ClutterInterval *interval,
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gdouble progress)
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{
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}
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static void
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clutter_transition_real_attached (ClutterTransition *transition,
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ClutterAnimatable *animatable)
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{
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}
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static void
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clutter_transition_real_detached (ClutterTransition *transition,
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ClutterAnimatable *animatable)
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{
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}
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static void
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clutter_transition_new_frame (ClutterTimeline *timeline,
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gint elapsed G_GNUC_UNUSED)
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{
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ClutterTransition *transition = CLUTTER_TRANSITION (timeline);
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ClutterTransitionPrivate *priv = transition->priv;
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gdouble progress;
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if (priv->interval == NULL ||
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priv->animatable == NULL)
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return;
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progress = clutter_timeline_get_progress (timeline);
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CLUTTER_TRANSITION_GET_CLASS (timeline)->compute_value (transition,
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priv->animatable,
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priv->interval,
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progress);
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}
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static void
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clutter_transition_stopped (ClutterTimeline *timeline,
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gboolean is_finished)
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{
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ClutterTransitionPrivate *priv = CLUTTER_TRANSITION (timeline)->priv;
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if (is_finished &&
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priv->animatable != NULL &&
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priv->remove_on_complete)
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{
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clutter_transition_detach (CLUTTER_TRANSITION (timeline),
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priv->animatable);
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g_clear_object (&priv->animatable);
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g_object_unref (timeline);
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}
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}
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static void
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clutter_transition_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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ClutterTransition *transition = CLUTTER_TRANSITION (gobject);
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switch (prop_id)
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{
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case PROP_INTERVAL:
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clutter_transition_set_interval (transition, g_value_get_object (value));
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break;
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case PROP_ANIMATABLE:
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clutter_transition_set_animatable (transition, g_value_get_object (value));
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break;
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case PROP_REMOVE_ON_COMPLETE:
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clutter_transition_set_remove_on_complete (transition, g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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clutter_transition_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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ClutterTransitionPrivate *priv = CLUTTER_TRANSITION (gobject)->priv;
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switch (prop_id)
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{
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case PROP_INTERVAL:
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g_value_set_object (value, priv->interval);
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break;
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case PROP_ANIMATABLE:
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g_value_set_object (value, priv->animatable);
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break;
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case PROP_REMOVE_ON_COMPLETE:
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g_value_set_boolean (value, priv->remove_on_complete);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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clutter_transition_dispose (GObject *gobject)
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{
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ClutterTransitionPrivate *priv = CLUTTER_TRANSITION (gobject)->priv;
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if (priv->animatable != NULL)
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clutter_transition_detach (CLUTTER_TRANSITION (gobject),
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priv->animatable);
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g_clear_object (&priv->interval);
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g_clear_object (&priv->animatable);
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G_OBJECT_CLASS (clutter_transition_parent_class)->dispose (gobject);
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}
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static void
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clutter_transition_class_init (ClutterTransitionClass *klass)
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{
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ClutterTimelineClass *timeline_class = CLUTTER_TIMELINE_CLASS (klass);
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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quark_animatable_set =
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g_quark_from_static_string ("-clutter-transition-animatable-set");
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g_type_class_add_private (klass, sizeof (ClutterTransitionPrivate));
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klass->compute_value = clutter_transition_real_compute_value;
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klass->attached = clutter_transition_real_attached;
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klass->detached = clutter_transition_real_detached;
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timeline_class->new_frame = clutter_transition_new_frame;
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timeline_class->stopped = clutter_transition_stopped;
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gobject_class->set_property = clutter_transition_set_property;
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gobject_class->get_property = clutter_transition_get_property;
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gobject_class->dispose = clutter_transition_dispose;
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/**
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* ClutterTransition:interval:
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*
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* The #ClutterInterval used to describe the initial and final states
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* of the transition.
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*
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* Since: 1.10
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*/
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obj_props[PROP_INTERVAL] =
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g_param_spec_object ("interval",
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P_("Interval"),
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P_("The interval of values to transition"),
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CLUTTER_TYPE_INTERVAL,
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G_PARAM_READWRITE |
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G_PARAM_STATIC_STRINGS);
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/**
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* ClutterTransition:animatable:
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*
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* The #ClutterAnimatable instance currently being animated.
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*
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* Since: 1.10
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*/
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obj_props[PROP_ANIMATABLE] =
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g_param_spec_object ("animatable",
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P_("Animatable"),
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P_("The animatable object"),
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CLUTTER_TYPE_ANIMATABLE,
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G_PARAM_READWRITE |
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G_PARAM_STATIC_STRINGS);
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/**
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* ClutterTransition:remove-on-complete:
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*
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* Whether the #ClutterTransition should be automatically detached
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* from the #ClutterTransition:animatable instance whenever the
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* #ClutterTimeline::completed signal is emitted.
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*
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* The #ClutterTransition:remove-on-complete property takes into
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* account the value of the #ClutterTimeline:repeat-count property,
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* and it only detaches the transition if the transition is not
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* repeating.
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*
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* Since: 1.10
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*/
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obj_props[PROP_REMOVE_ON_COMPLETE] =
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g_param_spec_boolean ("remove-on-complete",
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P_("Remove on Complete"),
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P_("Detach the transition when completed"),
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FALSE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
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g_object_class_install_properties (gobject_class, PROP_LAST, obj_props);
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}
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static void
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clutter_transition_init (ClutterTransition *self)
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{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, CLUTTER_TYPE_TRANSITION,
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ClutterTransitionPrivate);
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}
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/**
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* clutter_transition_set_interval:
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* @transition: a #ClutterTransition
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* @interval: (allow-none): a #ClutterInterval, or %NULL
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*
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* Sets the #ClutterTransition:interval property using @interval.
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*
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* The @transition will acquire a reference on the @interval, sinking
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* the floating flag on it if necessary.
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*
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* Since: 1.10
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*/
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void
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clutter_transition_set_interval (ClutterTransition *transition,
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ClutterInterval *interval)
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{
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ClutterTransitionPrivate *priv;
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g_return_if_fail (CLUTTER_IS_TRANSITION (transition));
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g_return_if_fail (interval == NULL || CLUTTER_IS_INTERVAL (interval));
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priv = transition->priv;
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g_clear_object (&priv->interval);
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if (interval != NULL)
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priv->interval = g_object_ref_sink (interval);
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g_object_notify_by_pspec (G_OBJECT (transition), obj_props[PROP_INTERVAL]);
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}
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/**
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* clutter_transition_get_interval:
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* @transition: a #ClutterTransition
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*
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* Retrieves the interval set using clutter_transition_set_interval()
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*
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* Return value: (transfer none): a #ClutterInterval, or %NULL; the returned
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* interval is owned by the #ClutterTransition and it should not be freed
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* directly
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*
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* Since: 1.10
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*/
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ClutterInterval *
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clutter_transition_get_interval (ClutterTransition *transition)
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{
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g_return_val_if_fail (CLUTTER_IS_TRANSITION (transition), NULL);
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return transition->priv->interval;
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}
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/**
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* clutter_transition_set_animatable:
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* @transition: a #ClutterTransition
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* @animatable: (allow-none): a #ClutterAnimatable, or %NULL
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*
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* Sets the #ClutterTransition:animatable property.
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*
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* The @transition will acquire a reference to the @animatable instance,
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* and will call the #ClutterTransitionClass.attached() virtual function.
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*
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* If an existing #ClutterAnimatable is attached to @transition, the
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* reference will be released, and the #ClutterTransitionClass.detached()
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* virtual function will be called.
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*
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* Since: 1.10
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*/
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void
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clutter_transition_set_animatable (ClutterTransition *transition,
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ClutterAnimatable *animatable)
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{
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ClutterTransitionPrivate *priv;
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g_return_if_fail (CLUTTER_IS_TRANSITION (transition));
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g_return_if_fail (animatable == NULL || CLUTTER_IS_ANIMATABLE (animatable));
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priv = transition->priv;
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if (priv->animatable == animatable)
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return;
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if (priv->animatable != NULL)
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clutter_transition_detach (transition, priv->animatable);
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g_clear_object (&priv->animatable);
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if (animatable != NULL)
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{
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priv->animatable = g_object_ref (animatable);
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clutter_transition_attach (transition, priv->animatable);
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}
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}
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/**
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* clutter_transition_get_animatable:
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* @transition: a #ClutterTransition
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*
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* Retrieves the #ClutterAnimatable set using clutter_transition_set_animatable().
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*
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* Return value: (transfer none): a #ClutterAnimatable, or %NULL; the returned
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* animatable is owned by the #ClutterTransition, and it should not be freed
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* directly.
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*
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* Since: 1.10
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*/
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ClutterAnimatable *
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clutter_transition_get_animatable (ClutterTransition *transition)
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{
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g_return_val_if_fail (CLUTTER_IS_TRANSITION (transition), NULL);
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return transition->priv->animatable;
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}
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/**
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* clutter_transition_set_remove_on_complete:
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* @transition: a #ClutterTransition
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* @remove_complete: whether to detach @transition when complete
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*
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* Sets whether @transition should be detached from the #ClutterAnimatable
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* set using clutter_transition_set_animatable() when the
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* #ClutterTimeline::completed signal is emitted.
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*
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* Since: 1.10
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*/
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void
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clutter_transition_set_remove_on_complete (ClutterTransition *transition,
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gboolean remove_complete)
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{
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g_return_if_fail (CLUTTER_IS_TRANSITION (transition));
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remove_complete = !!remove_complete;
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if (transition->priv->remove_on_complete == remove_complete)
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return;
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transition->priv->remove_on_complete = remove_complete;
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g_object_notify_by_pspec (G_OBJECT (transition),
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obj_props[PROP_REMOVE_ON_COMPLETE]);
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}
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/**
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* clutter_transition_get_remove_on_complete:
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* @transition: a #ClutterTransition
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*
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* Retrieves the value of the #ClutterTransition:remove-on-complete property.
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*
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* Return value: %TRUE if the @transition should be detached when complete,
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* and %FALSE otherwise
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*
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* Since: 1.10
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*/
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gboolean
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clutter_transition_get_remove_on_complete (ClutterTransition *transition)
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{
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g_return_val_if_fail (CLUTTER_IS_TRANSITION (transition), FALSE);
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return transition->priv->remove_on_complete;
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}
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typedef void (* IntervalSetFunc) (ClutterInterval *interval,
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const GValue *value);
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static inline void
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clutter_transition_set_value (ClutterTransition *transition,
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IntervalSetFunc interval_set_func,
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const GValue *value)
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{
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ClutterTransitionPrivate *priv = transition->priv;
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GType interval_type;
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if (priv->interval == NULL)
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{
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priv->interval = clutter_interval_new_with_values (G_VALUE_TYPE (value),
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NULL,
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NULL);
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g_object_ref_sink (priv->interval);
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}
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interval_type = clutter_interval_get_value_type (priv->interval);
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if (!g_type_is_a (G_VALUE_TYPE (value), interval_type))
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{
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if (g_value_type_compatible (G_VALUE_TYPE (value), interval_type))
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{
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interval_set_func (priv->interval, value);
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return;
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}
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if (g_value_type_transformable (G_VALUE_TYPE (value), interval_type))
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{
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GValue transform = G_VALUE_INIT;
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g_value_init (&transform, interval_type);
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if (g_value_transform (value, &transform))
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interval_set_func (priv->interval, &transform);
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else
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{
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g_warning ("%s: Unable to convert a value of type '%s' into "
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"the value type '%s' of the interval used by the "
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"transition.",
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G_STRLOC,
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g_type_name (G_VALUE_TYPE (value)),
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g_type_name (interval_type));
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}
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g_value_unset (&transform);
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}
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}
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else
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interval_set_func (priv->interval, value);
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}
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/**
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* clutter_transition_set_from_value:
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* @transition: a #ClutterTransition
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* @value: a #GValue with the initial value of the transition
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*
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* Sets the initial value of the transition.
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*
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* This is a convenience function that will either create the
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* #ClutterInterval used by @transition, or will update it if
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* the #ClutterTransition:interval is already set.
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*
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* This function will copy the contents of @value, so it is
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* safe to call g_value_unset() after it returns.
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*
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* If @transition already has a #ClutterTransition:interval set,
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* then @value must hold the same type, or a transformable type,
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* as the interval's #ClutterInterval:value-type property.
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*
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* This function is meant to be used by language bindings.
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*
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* Rename to: clutter_transition_set_from
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*
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* Since: 1.12
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*/
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void
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clutter_transition_set_from_value (ClutterTransition *transition,
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const GValue *value)
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{
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g_return_if_fail (CLUTTER_IS_TRANSITION (transition));
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g_return_if_fail (G_IS_VALUE (value));
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clutter_transition_set_value (transition,
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clutter_interval_set_initial_value,
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value);
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}
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/**
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* clutter_transition_set_to_value:
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* @transition: a #ClutterTransition
|
|
* @value: a #GValue with the final value of the transition
|
|
*
|
|
* Sets the final value of the transition.
|
|
*
|
|
* This is a convenience function that will either create the
|
|
* #ClutterInterval used by @transition, or will update it if
|
|
* the #ClutterTransition:interval is already set.
|
|
*
|
|
* This function will copy the contents of @value, so it is
|
|
* safe to call g_value_unset() after it returns.
|
|
*
|
|
* If @transition already has a #ClutterTransition:interval set,
|
|
* then @value must hold the same type, or a transformable type,
|
|
* as the interval's #ClutterInterval:value-type property.
|
|
*
|
|
* This function is meant to be used by language bindings.
|
|
*
|
|
* Rename to: clutter_transition_set_to
|
|
*
|
|
* Since: 1.12
|
|
*/
|
|
void
|
|
clutter_transition_set_to_value (ClutterTransition *transition,
|
|
const GValue *value)
|
|
{
|
|
g_return_if_fail (CLUTTER_IS_TRANSITION (transition));
|
|
g_return_if_fail (G_IS_VALUE (value));
|
|
|
|
clutter_transition_set_value (transition,
|
|
clutter_interval_set_final_value,
|
|
value);
|
|
}
|
|
|
|
/**
|
|
* clutter_transition_set_from: (skip)
|
|
* @transition: a #ClutterTransition
|
|
* @value_type: the type of the value to set
|
|
* @...: the initial value
|
|
*
|
|
* Sets the initial value of the transition.
|
|
*
|
|
* This is a convenience function that will either create the
|
|
* #ClutterInterval used by @transition, or will update it if
|
|
* the #ClutterTransition:interval is already set.
|
|
*
|
|
* If @transition already has a #ClutterTransition:interval set,
|
|
* then @value must hold the same type, or a transformable type,
|
|
* as the interval's #ClutterInterval:value-type property.
|
|
*
|
|
* This is a convenience function for the C API; language bindings
|
|
* should use clutter_transition_set_from_value() instead.
|
|
*
|
|
* Since: 1.12
|
|
*/
|
|
void
|
|
clutter_transition_set_from (ClutterTransition *transition,
|
|
GType value_type,
|
|
...)
|
|
{
|
|
GValue value = G_VALUE_INIT;
|
|
gchar *error = NULL;
|
|
va_list args;
|
|
|
|
g_return_if_fail (CLUTTER_IS_TRANSITION (transition));
|
|
g_return_if_fail (value_type != G_TYPE_INVALID);
|
|
|
|
va_start (args, value_type);
|
|
|
|
G_VALUE_COLLECT_INIT (&value, value_type, args, 0, &error);
|
|
|
|
va_end (args);
|
|
|
|
if (error != NULL)
|
|
{
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
return;
|
|
}
|
|
|
|
clutter_transition_set_value (transition,
|
|
clutter_interval_set_initial_value,
|
|
&value);
|
|
|
|
g_value_unset (&value);
|
|
}
|
|
|
|
/**
|
|
* clutter_transition_set_to: (skip)
|
|
* @transition: a #ClutterTransition
|
|
* @value_type: the type of the value to set
|
|
* @...: the final value
|
|
*
|
|
* Sets the final value of the transition.
|
|
*
|
|
* This is a convenience function that will either create the
|
|
* #ClutterInterval used by @transition, or will update it if
|
|
* the #ClutterTransition:interval is already set.
|
|
*
|
|
* If @transition already has a #ClutterTransition:interval set,
|
|
* then @value must hold the same type, or a transformable type,
|
|
* as the interval's #ClutterInterval:value-type property.
|
|
*
|
|
* This is a convenience function for the C API; language bindings
|
|
* should use clutter_transition_set_to_value() instead.
|
|
*
|
|
* Since: 1.12
|
|
*/
|
|
void
|
|
clutter_transition_set_to (ClutterTransition *transition,
|
|
GType value_type,
|
|
...)
|
|
{
|
|
GValue value = G_VALUE_INIT;
|
|
gchar *error = NULL;
|
|
va_list args;
|
|
|
|
g_return_if_fail (CLUTTER_IS_TRANSITION (transition));
|
|
g_return_if_fail (value_type != G_TYPE_INVALID);
|
|
|
|
va_start (args, value_type);
|
|
|
|
G_VALUE_COLLECT_INIT (&value, value_type, args, 0, &error);
|
|
|
|
va_end (args);
|
|
|
|
if (error != NULL)
|
|
{
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
return;
|
|
}
|
|
|
|
clutter_transition_set_value (transition,
|
|
clutter_interval_set_final_value,
|
|
&value);
|
|
|
|
g_value_unset (&value);
|
|
}
|