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305 lines
8.4 KiB
C
305 lines
8.4 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) 2008 OpenedHand
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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-stage-manager
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* @short_description: Maintains the list of stages
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*
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* #ClutterStageManager is a singleton object, owned by Clutter, which
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* maintains the list of currently active stages
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*
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* Every newly-created #ClutterStage will cause the emission of the
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* #ClutterStageManager::stage-added signal; once a #ClutterStage has
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* been destroyed, the #ClutterStageManager::stage-removed signal will
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* be emitted
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*
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* #ClutterStageManager is available since Clutter 0.8
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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-stage-manager-private.h"
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#include "clutter-marshal.h"
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#include "clutter-debug.h"
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#include "clutter-private.h"
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#include "clutter-version.h"
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enum
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{
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PROP_0,
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PROP_DEFAULT_STAGE
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};
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enum
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{
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STAGE_ADDED,
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STAGE_REMOVED,
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LAST_SIGNAL
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};
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static guint manager_signals[LAST_SIGNAL] = { 0, };
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static ClutterStage *default_stage = NULL;
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G_DEFINE_TYPE (ClutterStageManager, clutter_stage_manager, G_TYPE_OBJECT);
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static void
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clutter_stage_manager_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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switch (prop_id)
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{
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case PROP_DEFAULT_STAGE:
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g_value_set_object (value, default_stage);
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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_stage_manager_dispose (GObject *gobject)
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{
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ClutterStageManager *stage_manager;
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stage_manager = CLUTTER_STAGE_MANAGER (gobject);
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g_slist_foreach (stage_manager->stages, (GFunc) clutter_actor_destroy, NULL);
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g_slist_free (stage_manager->stages);
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stage_manager->stages = NULL;
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G_OBJECT_CLASS (clutter_stage_manager_parent_class)->dispose (gobject);
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}
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static void
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clutter_stage_manager_class_init (ClutterStageManagerClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->dispose = clutter_stage_manager_dispose;
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gobject_class->get_property = clutter_stage_manager_get_property;
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/**
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* ClutterStageManager:default-stage:
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*
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* The default stage used by Clutter.
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*
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*
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*/
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g_object_class_install_property (gobject_class,
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PROP_DEFAULT_STAGE,
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g_param_spec_object ("default-stage",
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"Default Stage",
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"The default stage",
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CLUTTER_TYPE_STAGE,
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CLUTTER_PARAM_READABLE));
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/**
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* ClutterStageManager::stage-added:
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* @stage_manager: the object which received the signal
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* @stage: the added stage
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*
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* The ::stage-added signal is emitted each time a new #ClutterStage
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* has been added to the stage manager.
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*
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*
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*/
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manager_signals[STAGE_ADDED] =
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g_signal_new ("stage-added",
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G_OBJECT_CLASS_TYPE (gobject_class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (ClutterStageManagerClass, stage_added),
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NULL, NULL,
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_clutter_marshal_VOID__OBJECT,
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G_TYPE_NONE, 1,
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CLUTTER_TYPE_STAGE);
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/**
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* ClutterStageManager::stage-removed:
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* @stage_manager: the object which received the signal
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* @stage: the removed stage
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*
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* The ::stage-removed signal is emitted each time a #ClutterStage
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* has been removed from the stage manager.
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*
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*
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*/
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manager_signals[STAGE_REMOVED] =
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g_signal_new ("stage-removed",
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G_OBJECT_CLASS_TYPE (gobject_class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (ClutterStageManagerClass, stage_removed),
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NULL, NULL,
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_clutter_marshal_VOID__OBJECT,
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G_TYPE_NONE, 1,
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CLUTTER_TYPE_STAGE);
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}
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static void
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clutter_stage_manager_init (ClutterStageManager *stage_manager)
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{
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}
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/**
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* clutter_stage_manager_get_default:
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*
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* Returns the default #ClutterStageManager.
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*
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* Return value: (transfer none): the default stage manager instance. The returned
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* object is owned by Clutter and you should not reference or unreference it.
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*
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*
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*/
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ClutterStageManager *
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clutter_stage_manager_get_default (void)
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{
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ClutterMainContext *context = _clutter_context_get_default ();
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if (G_UNLIKELY (context->stage_manager == NULL))
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context->stage_manager = g_object_new (CLUTTER_TYPE_STAGE_MANAGER, NULL);
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return context->stage_manager;
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}
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/*< private >
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* _clutter_stage_manager_set_default_stage:
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* @stage_manager: a #ClutterStageManager
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* @stage: a #ClutterStage
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*
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* Sets @stage as the default stage
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*
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* A no-op if there already is a default stage
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*/
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void
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_clutter_stage_manager_set_default_stage (ClutterStageManager *stage_manager,
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ClutterStage *stage)
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{
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if (G_UNLIKELY (default_stage == NULL))
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{
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default_stage = stage;
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/* the default stage is immediately realized */
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clutter_actor_realize (CLUTTER_ACTOR (stage));
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g_object_notify (G_OBJECT (stage_manager), "default-stage");
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}
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}
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/**
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* clutter_stage_manager_get_default_stage:
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* @stage_manager: a #ClutterStageManager
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*
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* Returns the default #ClutterStage.
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*
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* Return value: (transfer none): the default stage. The returned object
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* is owned by Clutter and you should never reference or unreference it
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*
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*
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*/
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ClutterStage *
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clutter_stage_manager_get_default_stage (ClutterStageManager *stage_manager)
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{
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return default_stage;
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}
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/**
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* clutter_stage_manager_list_stages:
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* @stage_manager: a #ClutterStageManager
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*
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* Lists all currently used stages.
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*
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* Return value: (transfer container) (element-type Clutter.Stage): a newly
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* allocated list of #ClutterStage objects. Use g_slist_free() to
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* deallocate it when done.
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*
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*
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*/
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GSList *
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clutter_stage_manager_list_stages (ClutterStageManager *stage_manager)
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{
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return g_slist_copy (stage_manager->stages);
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}
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/**
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* clutter_stage_manager_peek_stages:
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* @stage_manager: a #ClutterStageManager
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*
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* Lists all currently used stages.
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*
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* Return value: (transfer none) (element-type Clutter.Stage): a pointer
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* to the internal list of #ClutterStage objects. The returned list
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* is owned by the #ClutterStageManager and should never be modified
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* or freed
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*
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*
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*/
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const GSList *
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clutter_stage_manager_peek_stages (ClutterStageManager *stage_manager)
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{
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return stage_manager->stages;
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}
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void
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_clutter_stage_manager_add_stage (ClutterStageManager *stage_manager,
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ClutterStage *stage)
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{
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if (g_slist_find (stage_manager->stages, stage))
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{
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g_warning ("Trying to add a stage to the list of managed stages, "
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"but it is already in it, aborting.");
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return;
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}
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g_object_ref_sink (stage);
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stage_manager->stages = g_slist_append (stage_manager->stages, stage);
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g_signal_emit (stage_manager, manager_signals[STAGE_ADDED], 0, stage);
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}
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void
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_clutter_stage_manager_remove_stage (ClutterStageManager *stage_manager,
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ClutterStage *stage)
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{
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/* this might be called multiple times from a ::dispose, so it
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* needs to just return without warning
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*/
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if (!g_slist_find (stage_manager->stages, stage))
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return;
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stage_manager->stages = g_slist_remove (stage_manager->stages, stage);
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/* if the default stage is being destroyed then we unset the pointer */
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if (default_stage == stage)
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default_stage = NULL;
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g_signal_emit (stage_manager, manager_signals[STAGE_REMOVED], 0, stage);
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g_object_unref (stage);
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}
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