/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2008 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, see <http://www.gnu.org/licenses/>.
*
* Author: Emmanuele Bassi <ebassi@linux.intel.com>
*/
/**
* SECTION:clutter-stage-manager
* @short_description: Maintains the list of stages
*
* #ClutterStageManager is a singleton object, owned by Clutter, which
* maintains the list of currently active stages
*
* Every newly-created #ClutterStage will cause the emission of the
* #ClutterStageManager::stage-added signal; once a #ClutterStage has
* been destroyed, the #ClutterStageManager::stage-removed signal will
* be emitted
*
* #ClutterStageManager is available since Clutter 0.8
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-marshal.h"
#include "clutter-debug.h"
#include "clutter-private.h"
#include "clutter-version.h"
#include "clutter-stage-manager.h"
enum
{
PROP_0,
PROP_DEFAULT_STAGE
};
enum
{
STAGE_ADDED,
STAGE_REMOVED,
LAST_SIGNAL
};
static guint manager_signals[LAST_SIGNAL] = { 0, };
static ClutterStage *default_stage = NULL;
G_DEFINE_TYPE (ClutterStageManager, clutter_stage_manager, G_TYPE_OBJECT);
static void
clutter_stage_manager_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case PROP_DEFAULT_STAGE:
g_value_set_object (value, default_stage);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_stage_manager_dispose (GObject *gobject)
{
ClutterStageManager *stage_manager;
GSList *l, *next;
stage_manager = CLUTTER_STAGE_MANAGER (gobject);
for (l = stage_manager->stages; l; l = next)
{
ClutterActor *stage = l->data;
next = l->next;
if (stage)
clutter_actor_destroy (stage);
}
g_slist_free (stage_manager->stages);
stage_manager->stages = NULL;
G_OBJECT_CLASS (clutter_stage_manager_parent_class)->dispose (gobject);
}
static void
clutter_stage_manager_class_init (ClutterStageManagerClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->dispose = clutter_stage_manager_dispose;
gobject_class->get_property = clutter_stage_manager_get_property;
/**
* ClutterStageManager:default-stage:
*
* The default stage used by Clutter.
*
* Since: 0.8
*/
g_object_class_install_property (gobject_class,
PROP_DEFAULT_STAGE,
g_param_spec_object ("default-stage",
"Default Stage",
"The default stage",
CLUTTER_TYPE_STAGE,
CLUTTER_PARAM_READABLE));
/**
* ClutterStageManager::stage-added:
* @stage_manager: the object which received the signal
* @stage: the added stage
*
* The ::stage-added signal is emitted each time a new #ClutterStage
* has been added to the stage manager.
*
* Since: 0.8
*/
manager_signals[STAGE_ADDED] =
g_signal_new ("stage-added",
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterStageManagerClass, stage_added),
NULL, NULL,
_clutter_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
CLUTTER_TYPE_STAGE);
/**
* ClutterStageManager::stage-removed:
* @stage_manager: the object which received the signal
* @stage: the removed stage
*
* The ::stage-removed signal is emitted each time a #ClutterStage
* has been removed from the stage manager.
*
* Since: 0.8
*/
manager_signals[STAGE_REMOVED] =
g_signal_new ("stage-removed",
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (ClutterStageManagerClass, stage_removed),
NULL, NULL,
_clutter_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
CLUTTER_TYPE_STAGE);
}
static void
clutter_stage_manager_init (ClutterStageManager *stage_manager)
{
}
/**
* clutter_stage_manager_get_default:
*
* Returns the default #ClutterStageManager.
*
* Return value: (transfer none): the default stage manager instance. The returned
* object is owned by Clutter and you should not reference or unreference it.
*
* Since: 0.8
*/
ClutterStageManager *
clutter_stage_manager_get_default (void)
{
static ClutterStageManager *stage_manager = NULL;
if (G_UNLIKELY (stage_manager == NULL))
stage_manager = g_object_new (CLUTTER_TYPE_STAGE_MANAGER, NULL);
return stage_manager;
}
/**
* clutter_stage_manager_set_default_stage:
* @stage_manager: a #ClutterStageManager
* @stage: a #ClutterStage
*
* Sets @stage as the default stage.
*
* Since: 0.8
*
* Deprecated: 1.2: Calling this function has no effect
*/
void
clutter_stage_manager_set_default_stage (ClutterStageManager *stage_manager,
ClutterStage *stage)
{
}
/*
* _clutter_stage_manager_set_default_stage:
* @stage_manager: a #ClutterStageManager
* @stage: a #ClutterStage
*
* Sets @stage as the default stage
*
* A no-op if there already is a default stage
*
* This is called by clutter_stage_get_default() and should be removed
* along with #ClutterStageManager:default-stage when we stop having
* the default stage
*/
void
_clutter_stage_manager_set_default_stage (ClutterStageManager *stage_manager,
ClutterStage *stage)
{
if (G_UNLIKELY (default_stage == NULL))
{
default_stage = stage;
g_object_notify (G_OBJECT (stage_manager), "default-stage");
}
}
/**
* clutter_stage_manager_get_default_stage:
* @stage_manager: a #ClutterStageManager
*
* Returns the default #ClutterStage.
*
* Return value: (transfer none): the default stage. The returned object
* is owned by Clutter and you should never reference or unreference it
*
* Since: 0.8
*/
ClutterStage *
clutter_stage_manager_get_default_stage (ClutterStageManager *stage_manager)
{
return default_stage;
}
/**
* clutter_stage_manager_list_stages:
* @stage_manager: a #ClutterStageManager
*
* Lists all currently used stages.
*
* Return value: (transfer container) (element-type ClutterStage): a newly
* allocated list of #ClutterStage objects. Use g_slist_free() to
* deallocate it when done.
*
* Since: 0.8
*/
GSList *
clutter_stage_manager_list_stages (ClutterStageManager *stage_manager)
{
return g_slist_copy (stage_manager->stages);
}
/**
* clutter_stage_manager_peek_stages:
* @stage_manager: a #ClutterStageManager
*
* Lists all currently used stages.
*
* Return value: (transfer none) (element-type ClutterStage): a pointer
* to the internal list of #ClutterStage objects. The returned list
* is owned by the #ClutterStageManager and should never be modified
* or freed
*
* Since: 1.0
*/
const GSList *
clutter_stage_manager_peek_stages (ClutterStageManager *stage_manager)
{
return stage_manager->stages;
}
void
_clutter_stage_manager_add_stage (ClutterStageManager *stage_manager,
ClutterStage *stage)
{
if (g_slist_find (stage_manager->stages, stage))
{
g_warning ("Trying to add a stage to the list of managed stages, "
"but it is already in it, aborting.");
return;
}
g_object_ref_sink (stage);
stage_manager->stages = g_slist_append (stage_manager->stages, stage);
g_signal_emit (stage_manager, manager_signals[STAGE_ADDED], 0, stage);
}
void
_clutter_stage_manager_remove_stage (ClutterStageManager *stage_manager,
ClutterStage *stage)
{
/* this might be called multiple times from a ::dispose, so it
* needs to just return without warning
*/
if (!g_slist_find (stage_manager->stages, stage))
return;
stage_manager->stages = g_slist_remove (stage_manager->stages, stage);
/* if it's the default stage, get the first available from the list */
if (default_stage == stage)
default_stage = stage_manager->stages ? stage_manager->stages->data
: NULL;
g_signal_emit (stage_manager, manager_signals[STAGE_REMOVED], 0, stage);
g_object_unref (stage);
}