/* * Clutter. * * An OpenGL based 'interactive canvas' library. * * Authored By Matthew Allum * * Copyright (C) 2006 OpenedHand * * 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, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:clutter-behaviour-opacity * @short_description: A behaviour controlling opacity * * #ClutterBehaviourPath interpolates actors opacity between two values. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "clutter-actor.h" #include "clutter-behaviour.h" #include "clutter-behaviour-opacity.h" #include "clutter-enum-types.h" #include "clutter-main.h" #include "clutter-private.h" #include "clutter-debug.h" #include /** * SECTION:clutter-behaviour-opacity * @short_description: Behaviour controlling the opacity * * #ClutterBehaviourOpacity controls the opacity of a set of actors. * * Since: 0.2 */ G_DEFINE_TYPE (ClutterBehaviourOpacity, clutter_behaviour_opacity, CLUTTER_TYPE_BEHAVIOUR); struct _ClutterBehaviourOpacityPrivate { guint8 opacity_start; guint8 opacity_end; }; #define CLUTTER_BEHAVIOUR_OPACITY_GET_PRIVATE(obj) \ (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \ CLUTTER_TYPE_BEHAVIOUR_OPACITY, \ ClutterBehaviourOpacityPrivate)) enum { PROP_0, PROP_OPACITY_START, PROP_OPACITY_END }; static void alpha_notify_foreach (ClutterBehaviour *behaviour, ClutterActor *actor, gpointer data) { clutter_actor_set_opacity (actor, GPOINTER_TO_UINT(data)); } static void clutter_behaviour_alpha_notify (ClutterBehaviour *behave, gdouble alpha_value) { ClutterBehaviourOpacityPrivate *priv; guint8 opacity; priv = CLUTTER_BEHAVIOUR_OPACITY (behave)->priv; opacity = alpha_value * (priv->opacity_end - priv->opacity_start) + priv->opacity_start; CLUTTER_NOTE (BEHAVIOUR, "alpha: %.4f, opacity: %u", alpha_value, opacity); clutter_behaviour_actors_foreach (behave, alpha_notify_foreach, GUINT_TO_POINTER ((guint) opacity)); } static void clutter_behaviour_opacity_set_property (GObject *gobject, guint prop_id, const GValue *value, GParamSpec *pspec) { ClutterBehaviourOpacity *opacityb = CLUTTER_BEHAVIOUR_OPACITY (gobject); switch (prop_id) { case PROP_OPACITY_START: opacityb->priv->opacity_start = g_value_get_uint (value); break; case PROP_OPACITY_END: opacityb->priv->opacity_end = g_value_get_uint (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec); break; } } static void clutter_behaviour_opacity_get_property (GObject *gobject, guint prop_id, GValue *value, GParamSpec *pspec) { ClutterBehaviourOpacity *opacityb = CLUTTER_BEHAVIOUR_OPACITY (gobject); switch (prop_id) { case PROP_OPACITY_START: g_value_set_uint (value, opacityb->priv->opacity_start); break; case PROP_OPACITY_END: g_value_set_uint (value, opacityb->priv->opacity_end); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec); break; } } static void clutter_behaviour_opacity_class_init (ClutterBehaviourOpacityClass *klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); ClutterBehaviourClass *behave_class = CLUTTER_BEHAVIOUR_CLASS (klass); gobject_class->set_property = clutter_behaviour_opacity_set_property; gobject_class->get_property = clutter_behaviour_opacity_get_property; /** * ClutterBehaviourOpacity:opacity-start: * * Initial opacity level of the behaviour. * * Since: 0.2 */ g_object_class_install_property (gobject_class, PROP_OPACITY_START, g_param_spec_uint ("opacity-start", "Opacity Start", "Initial opacity level", 0, 255, 0, CLUTTER_PARAM_READWRITE)); /** * ClutterBehaviourOpacity:opacity-end: * * Final opacity level of the behaviour. * * Since: 0.2 */ g_object_class_install_property (gobject_class, PROP_OPACITY_END, g_param_spec_uint ("opacity-end", "Opacity End", "Final opacity level", 0, 255, 0, CLUTTER_PARAM_READWRITE)); behave_class->alpha_notify = clutter_behaviour_alpha_notify; g_type_class_add_private (klass, sizeof (ClutterBehaviourOpacityPrivate)); } static void clutter_behaviour_opacity_init (ClutterBehaviourOpacity *self) { self->priv = CLUTTER_BEHAVIOUR_OPACITY_GET_PRIVATE (self); self->priv->opacity_start = 0; self->priv->opacity_end = 0; } /** * clutter_behaviour_opacity_new: * @alpha: a #ClutterAlpha instance, or %NULL * @opacity_start: minimum level of opacity * @opacity_end: maximum level of opacity * * Creates a new #ClutterBehaviourOpacity object, driven by @alpha * which controls the opacity property of every actor, making it * change in the interval between @opacity_start and @opacity_end. * * Return value: the newly created #ClutterBehaviourOpacity * * Since: 0.2 */ ClutterBehaviour * clutter_behaviour_opacity_new (ClutterAlpha *alpha, guint8 opacity_start, guint8 opacity_end) { return g_object_new (CLUTTER_TYPE_BEHAVIOUR_OPACITY, "alpha", alpha, "opacity-start", opacity_start, "opacity-end", opacity_end, NULL); } /** * clutter_behaviour_opacity_set_bounds: * @behaviour: a #ClutterBehaviourOpacity * @opacity_start: minimum level of opacity * @opacity_end: maximum level of opacity * * Sets the initial and final levels of the opacity applied by @behaviour * on each actor it controls. * * Since: 0.6 */ void clutter_behaviour_opacity_set_bounds (ClutterBehaviourOpacity *behaviour, guint8 opacity_start, guint8 opacity_end) { ClutterBehaviourOpacityPrivate *priv; g_return_if_fail (CLUTTER_IS_BEHAVIOUR_OPACITY (behaviour)); priv = behaviour->priv; g_object_freeze_notify (G_OBJECT (behaviour)); if (priv->opacity_start != opacity_start) { priv->opacity_start = opacity_start; g_object_notify (G_OBJECT (behaviour), "opacity-start"); } if (priv->opacity_end != opacity_end) { priv->opacity_end = opacity_end; g_object_notify (G_OBJECT (behaviour), "opacity-end"); } g_object_thaw_notify (G_OBJECT (behaviour)); } /** * clutter_behaviour_opacity_get_bounds: * @behaviour: a #ClutterBehaviourOpacity * @opacity_start: return location for the minimum level of opacity, or %NULL * @opacity_end: return location for the maximum level of opacity, or %NULL * * Gets the initial and final levels of the opacity applied by @behaviour * on each actor it controls. * * Since: 0.6 */ void clutter_behaviour_opacity_get_bounds (ClutterBehaviourOpacity *behaviour, guint8 *opacity_start, guint8 *opacity_end) { g_return_if_fail (CLUTTER_IS_BEHAVIOUR_OPACITY (behaviour)); if (opacity_start) *opacity_start = behaviour->priv->opacity_start; if (opacity_end) *opacity_end = behaviour->priv->opacity_end; }