mutter/clutter/clutter-container.c

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* 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.
*
* ClutterContainer: Generic actor container interface.
* Author: Emmanuele Bassi <ebassi@openedhand.com>
*/
#include "config.h"
#include <stdarg.h>
#include <glib-object.h>
#include "clutter-container.h"
#include "clutter-debug.h"
#include "clutter-main.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
#include "clutter-enum-types.h"
/**
* SECTION:clutter-container
* @short_description: An interface for implementing container actors
*
* #ClutterContainer is an interface for writing actors containing other
* #ClutterActor<!-- -->s. It provides a standard API for adding, removing
* and iterating on every contained actor.
*
* An actor implementing #ClutterContainer is #ClutterGroup.
*
* #ClutterContainer is available since Clutter 0.4
*/
enum
{
ACTOR_ADDED,
ACTOR_REMOVED,
LAST_SIGNAL
};
static guint container_signals[LAST_SIGNAL] = { 0, };
static void
clutter_container_base_init (gpointer g_iface)
{
static gboolean initialised = FALSE;
if (!initialised)
{
GType iface_type = G_TYPE_FROM_INTERFACE (g_iface);
initialised = TRUE;
/**
* ClutterContainer::actor-added:
* @container: the actor which received the signal
* @actor: the new child that has been added to @container
*
* The ::actor-added signal is emitted each time an actor
* has been added to @container.
*
* Since: 0.4
*/
container_signals[ACTOR_ADDED] =
g_signal_new ("actor-added",
iface_type,
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (ClutterContainerIface, actor_added),
NULL, NULL,
clutter_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
CLUTTER_TYPE_ACTOR);
/**
* ClutterContainer::actor-removed:
* @container: the actor which received the signal
* @actor: the child that has been removed from @container
*
* The ::actor-removed signal is emitted each time an actor
* is removed from @container.
*
* Since: 0.4
*/
container_signals[ACTOR_REMOVED] =
g_signal_new ("actor-removed",
iface_type,
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (ClutterContainerIface, actor_removed),
NULL, NULL,
clutter_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
CLUTTER_TYPE_ACTOR);
}
}
GType
clutter_container_get_type (void)
{
static GType container_type = 0;
if (G_UNLIKELY (!container_type))
{
GTypeInfo container_info =
{
sizeof (ClutterContainerIface),
clutter_container_base_init,
NULL, /* iface_finalize */
};
container_type = g_type_register_static (G_TYPE_INTERFACE,
"ClutterContainer",
&container_info, 0);
g_type_interface_add_prerequisite (container_type, CLUTTER_TYPE_ACTOR);
}
return container_type;
}
/**
* clutter_container_add:
* @container: a #ClutterContainer
* @first_actor: the first #ClutterActor to add
* @Varargs: %NULL terminated list of actors to add
*
* Adds a list of #ClutterActor<!-- -->s to @container. Each time and
* actor is added, the "actor-added" signal is emitted. Each actor should
* be parented to @container, which takes a reference on the actor. You
* cannot add a #ClutterActor to more than one #ClutterContainer.
*
* Since: 0.4
*/
void
clutter_container_add (ClutterContainer *container,
ClutterActor *first_actor,
...)
{
va_list var_args;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (first_actor));
va_start (var_args, first_actor);
clutter_container_add_valist (container, first_actor, var_args);
va_end (var_args);
}
/**
* clutter_container_add_actor:
* @container: a #ClutterContainer
* @actor: the first #ClutterActor to add
*
* Adds a #ClutterActor to @container. This function will emit the
* "actor-added" signal is emitted. The actor should be parented to
* @container. You cannot add a #ClutterActor to more than one
* #ClutterContainer.
*
* Since: 0.4
*/
void
clutter_container_add_actor (ClutterContainer *container,
ClutterActor *actor)
{
ClutterActor *parent;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
parent = clutter_actor_get_parent (actor);
if (parent)
{
g_warning ("Attempting to add actor of type `%s' to a "
"group of type `%s', but the actor has already "
"a parent of type `%s'.",
g_type_name (G_OBJECT_TYPE (actor)),
g_type_name (G_OBJECT_TYPE (container)),
g_type_name (G_OBJECT_TYPE (parent)));
return;
}
CLUTTER_CONTAINER_GET_IFACE (container)->add (container, actor);
}
/**
* clutter_container_add:
* @container: a #ClutterContainer
* @first_actor: the first #ClutterActor to add
* @var_args: list of actors to add, followed by %NULL
*
* Alternative va_list version of clutter_container_add().
*
* Since: 0.4
*/
void
clutter_container_add_valist (ClutterContainer *container,
ClutterActor *first_actor,
va_list var_args)
{
ClutterActor *actor;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (first_actor));
actor = first_actor;
while (actor)
{
clutter_container_add_actor (container, actor);
actor = va_arg (var_args, ClutterActor*);
}
}
/**
* clutter_container_remove:
* @container: a #ClutterContainer
* @first_actor: first #ClutterActor to remove
* @Varargs: a %NULL-terminated list of actors to remove
*
* Removes a %NULL terminated list of #ClutterActor<!-- -->s from
* @container. Each actor should be unparented, so if you want to keep it
* around you must hold a reference to it yourself, using g_object_ref().
* Each time an actor is removed, the "actor-removed" signal is
* emitted by @container.
*
* Since: 0.4
*/
void
clutter_container_remove (ClutterContainer *container,
ClutterActor *first_actor,
...)
{
va_list var_args;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (first_actor));
va_start (var_args, first_actor);
clutter_container_remove_valist (container, first_actor, var_args);
va_end (var_args);
}
/**
* clutter_container_remove_actor:
* @container: a #ClutterContainer
* @actor: a #ClutterActor
*
* Removes @actor from @container. The actor should be unparented, so
* if you want to keep it around you must hold a reference to it
* yourself, using g_object_ref(). When the actor has been removed,
* the "actor-removed" signal is emitted by @container.
*
* Since: 0.4
*/
void
clutter_container_remove_actor (ClutterContainer *container,
ClutterActor *actor)
{
ClutterActor *parent;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
parent = clutter_actor_get_parent (actor);
if (parent != CLUTTER_ACTOR (container))
{
g_warning ("Attempting to remove actor of type `%s' from "
"group of class `%s', but the group is not the "
"actor's parent.",
g_type_name (G_OBJECT_TYPE (actor)),
g_type_name (G_OBJECT_TYPE (container)));
return;
}
CLUTTER_CONTAINER_GET_IFACE (container)->remove (container, actor);
}
/**
* clutter_container_remove_valist:
* @container: a #ClutterContainer
* @first_actor: the first #ClutterActor to add
* @var_args: list of actors to remove, followed by %NULL
*
* Alternative va_list version of clutter_container_remove().
*
* Since: 0.4
*/
void
clutter_container_remove_valist (ClutterContainer *container,
ClutterActor *first_actor,
va_list var_args)
{
ClutterActor *actor;
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (CLUTTER_IS_ACTOR (first_actor));
actor = first_actor;
while (actor)
{
clutter_container_remove_actor (container, actor);
actor = va_arg (var_args, ClutterActor*);
}
}
static void
get_children_cb (ClutterActor *child,
gpointer data)
{
GList **children = data;
*children = g_list_prepend (*children, child);
}
/**
* clutter_container_get_children:
* @container: a #ClutterContainer
*
* Retrieves all the children of @container.
*
* Return value: a list of #ClutterActor<!-- -->s. Use g_list_free()
* on the returned list when done.
*
* Since: 0.4
*/
GList *
clutter_container_get_children (ClutterContainer *container)
{
GList *retval;
g_return_val_if_fail (CLUTTER_IS_CONTAINER (container), NULL);
retval = NULL;
clutter_container_foreach (container, get_children_cb, &retval);
return g_list_reverse (retval);
}
/**
* clutter_container_foreach:
* @container: a #ClutterContainer
* @callback: a function to be called for each child
* @user_data: data to be passed to the function, or %NULL
*
* Calls @callback for each child of @container.
*
* Since: 0.4
*/
void
clutter_container_foreach (ClutterContainer *container,
ClutterCallback callback,
gpointer user_data)
{
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
g_return_if_fail (callback != NULL);
CLUTTER_CONTAINER_GET_IFACE (container)->foreach (container, callback, user_data);
}