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397 lines
11 KiB
C
397 lines
11 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) 2010 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-path-constraint
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* @Title: ClutterPathConstraint
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* @Short_Description: A constraint that follows a path
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*
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* #ClutterPathConstraint is a simple constraint that modifies the allocation
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* of the #ClutterActor to which it has been applied using a #ClutterPath.
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*
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* By setting the #ClutterPathConstraint:offset property it is possible to
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* control how far along the path the #ClutterActor should be.
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*
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* ClutterPathConstraint is available since Clutter 1.6.
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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-path-constraint.h"
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#include "clutter-debug.h"
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#include "clutter-marshal.h"
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#include "clutter-private.h"
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#define CLUTTER_PATH_CONSTRAINT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_PATH_CONSTRAINT, ClutterPathConstraintClass))
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#define CLUTTER_IS_PATH_CONSTRAINT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_PATH_CONSTRAINT))
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#define CLUTTER_PATH_CONSTRAINT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_PATH_CONSTRAINT, ClutterPathConstraintClass))
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struct _ClutterPathConstraint
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{
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ClutterConstraint parent_instance;
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ClutterPath *path;
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gfloat offset;
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ClutterActor *actor;
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guint current_node;
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};
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struct _ClutterPathConstraintClass
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{
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ClutterConstraintClass parent_class;
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};
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enum
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{
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PROP_0,
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PROP_PATH,
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PROP_OFFSET,
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LAST_PROPERTY
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};
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enum
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{
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NODE_REACHED,
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LAST_SIGNAL
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};
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G_DEFINE_TYPE (ClutterPathConstraint, clutter_path_constraint, CLUTTER_TYPE_CONSTRAINT);
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static GParamSpec *path_properties[LAST_PROPERTY] = { NULL, };
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static guint path_signals[LAST_SIGNAL] = { 0, };
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static void
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clutter_path_constraint_update_allocation (ClutterConstraint *constraint,
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ClutterActor *actor,
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ClutterActorBox *allocation)
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{
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ClutterPathConstraint *self = CLUTTER_PATH_CONSTRAINT (constraint);
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gfloat width, height;
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ClutterKnot position;
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guint knot_id;
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if (self->path == NULL)
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return;
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knot_id = clutter_path_get_position (self->path, self->offset, &position);
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clutter_actor_box_get_size (allocation, &width, &height);
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allocation->x1 = position.x;
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allocation->y1 = position.y;
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allocation->x2 = allocation->x1 + width;
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allocation->y2 = allocation->y1 + height;
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if (knot_id != self->current_node)
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{
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self->current_node = knot_id;
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g_signal_emit (self, path_signals[NODE_REACHED], 0,
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self->actor,
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self->current_node);
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}
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}
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static void
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clutter_path_constraint_set_actor (ClutterActorMeta *meta,
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ClutterActor *new_actor)
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{
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ClutterPathConstraint *path = CLUTTER_PATH_CONSTRAINT (meta);
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ClutterActorMetaClass *parent;
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/* store the pointer to the actor, for later use */
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path->actor = new_actor;
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parent = CLUTTER_ACTOR_META_CLASS (clutter_path_constraint_parent_class);
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parent->set_actor (meta, new_actor);
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}
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static void
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clutter_path_constraint_dispose (GObject *gobject)
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{
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ClutterPathConstraint *self = CLUTTER_PATH_CONSTRAINT (gobject);
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if (self->path != NULL)
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{
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g_object_unref (self->path);
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self->path = NULL;
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}
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G_OBJECT_CLASS (clutter_path_constraint_parent_class)->dispose (gobject);
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}
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static void
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clutter_path_constraint_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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ClutterPathConstraint *self = CLUTTER_PATH_CONSTRAINT (gobject);
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switch (prop_id)
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{
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case PROP_PATH:
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clutter_path_constraint_set_path (self, g_value_get_object (value));
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break;
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case PROP_OFFSET:
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clutter_path_constraint_set_offset (self, g_value_get_float (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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}
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}
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static void
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clutter_path_constraint_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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ClutterPathConstraint *self = CLUTTER_PATH_CONSTRAINT (gobject);
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switch (prop_id)
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{
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case PROP_PATH:
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g_value_set_object (value, self->path);
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break;
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case PROP_OFFSET:
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g_value_set_float (value, self->offset);
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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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}
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}
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static void
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clutter_path_constraint_class_init (ClutterPathConstraintClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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ClutterActorMetaClass *meta_class = CLUTTER_ACTOR_META_CLASS (klass);
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ClutterConstraintClass *constraint_class = CLUTTER_CONSTRAINT_CLASS (klass);
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/**
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* ClutterPathConstraint:path:
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*
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* The #ClutterPath used to constrain the position of an actor.
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*
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*
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*/
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path_properties[PROP_PATH] =
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g_param_spec_object ("path",
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P_("Path"),
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P_("The path used to constrain an actor"),
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CLUTTER_TYPE_PATH,
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CLUTTER_PARAM_READWRITE);
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/**
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* ClutterPathConstraint:offset:
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*
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* The offset along the #ClutterPathConstraint:path, between -1.0 and 2.0.
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*
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*
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*/
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path_properties[PROP_OFFSET] =
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g_param_spec_float ("offset",
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P_("Offset"),
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P_("The offset along the path, between -1.0 and 2.0"),
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-1.0, 2.0,
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0.0,
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CLUTTER_PARAM_READWRITE);
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gobject_class->set_property = clutter_path_constraint_set_property;
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gobject_class->get_property = clutter_path_constraint_get_property;
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gobject_class->dispose = clutter_path_constraint_dispose;
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g_object_class_install_properties (gobject_class,
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LAST_PROPERTY,
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path_properties);
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meta_class->set_actor = clutter_path_constraint_set_actor;
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constraint_class->update_allocation = clutter_path_constraint_update_allocation;
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/**
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* ClutterPathConstraint::node-reached:
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* @constraint: the #ClutterPathConstraint that emitted the signal
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* @actor: the #ClutterActor using the @constraint
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* @index: the index of the node that has been reached
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*
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* The ::node-reached signal is emitted each time a
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* #ClutterPathConstraint:offset value results in the actor
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* passing a #ClutterPathNode
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*
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*
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*/
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path_signals[NODE_REACHED] =
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g_signal_new (I_("node-reached"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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0,
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NULL, NULL,
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_clutter_marshal_VOID__OBJECT_UINT,
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G_TYPE_NONE, 2,
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CLUTTER_TYPE_ACTOR,
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G_TYPE_UINT);
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}
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static void
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clutter_path_constraint_init (ClutterPathConstraint *self)
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{
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self->offset = 0.0f;
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self->current_node = G_MAXUINT;
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}
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/**
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* clutter_path_constraint_new:
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* @path: (allow-none): a #ClutterPath, or %NULL
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* @offset: the offset along the #ClutterPath
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*
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* Creates a new #ClutterPathConstraint with the given @path and @offset
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*
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* Return value: the newly created #ClutterPathConstraint
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*
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*
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*/
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ClutterConstraint *
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clutter_path_constraint_new (ClutterPath *path,
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gfloat offset)
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{
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g_return_val_if_fail (path == NULL || CLUTTER_IS_PATH (path), NULL);
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return g_object_new (CLUTTER_TYPE_PATH_CONSTRAINT,
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"path", path,
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"offset", offset,
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NULL);
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}
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/**
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* clutter_path_constraint_set_path:
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* @constraint: a #ClutterPathConstraint
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* @path: (allow-none): a #ClutterPath
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*
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* Sets the @path to be followed by the #ClutterPathConstraint.
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*
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* The @constraint will take ownership of the #ClutterPath passed to this
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* function.
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*
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*
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*/
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void
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clutter_path_constraint_set_path (ClutterPathConstraint *constraint,
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ClutterPath *path)
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{
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g_return_if_fail (CLUTTER_IS_PATH_CONSTRAINT (constraint));
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g_return_if_fail (path == NULL || CLUTTER_IS_PATH (path));
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if (constraint->path == path)
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return;
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if (constraint->path != NULL)
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{
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g_object_unref (constraint->path);
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constraint->path = NULL;
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}
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if (path != NULL)
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constraint->path = g_object_ref_sink (path);
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if (constraint->actor != NULL)
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clutter_actor_queue_relayout (constraint->actor);
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g_object_notify_by_pspec (G_OBJECT (constraint), path_properties[PROP_PATH]);
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}
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/**
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* clutter_path_constraint_get_path:
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* @constraint: a #ClutterPathConstraint
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*
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* Retrieves a pointer to the #ClutterPath used by @constraint.
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*
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* Return value: (transfer none): the #ClutterPath used by the
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* #ClutterPathConstraint, or %NULL. The returned #ClutterPath is owned
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* by the constraint and it should not be unreferenced
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*
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*
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*/
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ClutterPath *
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clutter_path_constraint_get_path (ClutterPathConstraint *constraint)
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{
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g_return_val_if_fail (CLUTTER_IS_PATH_CONSTRAINT (constraint), NULL);
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return constraint->path;
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}
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/**
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* clutter_path_constraint_set_offset:
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* @constraint: a #ClutterPathConstraint
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* @offset: the offset along the path
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*
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* Sets the offset along the #ClutterPath used by @constraint.
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*
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*
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*/
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void
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clutter_path_constraint_set_offset (ClutterPathConstraint *constraint,
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gfloat offset)
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{
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g_return_if_fail (CLUTTER_IS_PATH_CONSTRAINT (constraint));
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if (constraint->offset == offset)
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return;
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constraint->offset = offset;
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if (constraint->actor != NULL)
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clutter_actor_queue_relayout (constraint->actor);
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g_object_notify_by_pspec (G_OBJECT (constraint), path_properties[PROP_OFFSET]);
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}
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/**
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* clutter_path_constraint_get_offset:
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* @constraint: a #ClutterPathConstraint
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*
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* Retrieves the offset along the #ClutterPath used by @constraint.
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*
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* Return value: the offset
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*
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*
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*/
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gfloat
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clutter_path_constraint_get_offset (ClutterPathConstraint *constraint)
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{
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g_return_val_if_fail (CLUTTER_IS_PATH_CONSTRAINT (constraint), 0.0);
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return constraint->offset;
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}
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