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0eeb61f3a8
Instead of requiring a call to clutter_content_get_preferred_size(), we can simply pass the canvas size to the Canvas::draw signal.
306 lines
8.4 KiB
C
306 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) 2011 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-content
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* @Title: ClutterContent
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* @Short_Description: Delegate for painting the content of an actor
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*
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* #ClutterContent is an interface to implement types responsible for
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* painting the content of a #ClutterActor.
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*
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* Multiple actors can use the same #ClutterContent instance, in order
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* to share the resources associated with painting the same content.
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*
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* #ClutterContent is available since Clutter 1.10.
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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-content-private.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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typedef struct _ClutterContentIface ClutterContentInterface;
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enum
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{
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ATTACHED,
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DETACHED,
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LAST_SIGNAL
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};
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static GQuark quark_content_actors = 0;
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static guint content_signals[LAST_SIGNAL] = { 0, };
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G_DEFINE_INTERFACE (ClutterContent, clutter_content, G_TYPE_OBJECT)
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static gboolean
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clutter_content_real_get_preferred_size (ClutterContent *content,
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gfloat *width,
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gfloat *height)
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{
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if (width != NULL)
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*width = 0.f;
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if (height != NULL)
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*height = 0.f;
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return FALSE;
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}
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static void
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clutter_content_real_attached (ClutterContent *content,
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ClutterActor *actor)
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{
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}
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static void
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clutter_content_real_detached (ClutterContent *content,
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ClutterActor *actor)
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{
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}
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static void
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clutter_content_real_invalidate (ClutterContent *content)
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{
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}
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static void
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clutter_content_real_paint_content (ClutterContent *content,
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ClutterActor *actor,
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ClutterPaintNode *context)
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{
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}
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static void
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clutter_content_default_init (ClutterContentInterface *iface)
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{
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quark_content_actors = g_quark_from_static_string ("-clutter-content-actors");
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iface->get_preferred_size = clutter_content_real_get_preferred_size;
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iface->paint_content = clutter_content_real_paint_content;
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iface->attached = clutter_content_real_attached;
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iface->detached = clutter_content_real_detached;
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iface->invalidate = clutter_content_real_invalidate;
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/**
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* ClutterContent::attached:
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* @content: the object that emitted the signal
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* @actor: a #ClutterActor
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*
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* This signal is emitted each time a #ClutterContent implementation is
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* assigned to a #ClutterActor.
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*
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* Since: 1.10
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*/
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content_signals[ATTACHED] =
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g_signal_new (I_("attached"),
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G_TYPE_FROM_INTERFACE (iface),
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (ClutterContentIface, attached),
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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_ACTOR);
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/**
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* ClutterContent::detached:
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* @content: the object that emitted the signal
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* @actor: a #ClutterActor
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*
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* This signal is emitted each time a #ClutterContent implementation is
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* removed from a #ClutterActor.
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*
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* Since: 1.10
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*/
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content_signals[DETACHED] =
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g_signal_new (I_("detached"),
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G_TYPE_FROM_INTERFACE (iface),
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (ClutterContentIface, detached),
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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_ACTOR);
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}
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/**
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* clutter_content_invalidate:
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* @content: a #ClutterContent
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*
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* Invalidates a #ClutterContent.
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*
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* This function should be called by #ClutterContent implementations when
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* they change the way a the content should be painted regardless of the
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* actor state.
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*
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* Since: 1.10
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*/
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void
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clutter_content_invalidate (ClutterContent *content)
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{
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GHashTable *actors;
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GHashTableIter iter;
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gpointer key_p, value_p;
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g_return_if_fail (CLUTTER_IS_CONTENT (content));
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CLUTTER_CONTENT_GET_IFACE (content)->invalidate (content);
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actors = g_object_get_qdata (G_OBJECT (content), quark_content_actors);
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if (actors == NULL)
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return;
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g_hash_table_iter_init (&iter, actors);
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while (g_hash_table_iter_next (&iter, &key_p, &value_p))
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{
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ClutterActor *actor = key_p;
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g_assert (actor != NULL);
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clutter_actor_queue_redraw (actor);
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}
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}
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/*< private >
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* _clutter_content_attached:
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* @content: a #ClutterContent
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* @actor: a #ClutterActor
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*
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* Attaches @actor to the @content.
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*
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* This function should be used internally every time a #ClutterActor
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* is associated to a #ClutterContent, to set up a backpointer from
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* the @content to the @actor.
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*
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* This function will invoke the #ClutterContentIface.attached() virtual
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* function.
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*/
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void
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_clutter_content_attached (ClutterContent *content,
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ClutterActor *actor)
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{
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GObject *obj = G_OBJECT (content);
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GHashTable *actors;
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actors = g_object_get_qdata (obj, quark_content_actors);
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if (actors == NULL)
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{
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actors = g_hash_table_new (NULL, NULL);
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g_object_set_qdata_full (obj, quark_content_actors,
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actors,
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(GDestroyNotify) g_hash_table_unref);
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}
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g_hash_table_insert (actors, actor, actor);
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g_signal_emit (content, content_signals[ATTACHED], 0, actor);
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}
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/*< private >
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* _clutter_content_detached:
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* @content: a #ClutterContent
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* @actor: a #ClutterActor
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*
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* Detaches @actor from @content.
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*
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* This function should be used internally every time a #ClutterActor
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* removes the association with a #ClutterContent.
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*
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* This function will invoke the #ClutterContentIface.detached() virtual
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* function.
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*/
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void
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_clutter_content_detached (ClutterContent *content,
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ClutterActor *actor)
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{
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GObject *obj = G_OBJECT (content);
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GHashTable *actors;
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actors = g_object_get_qdata (obj, quark_content_actors);
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g_assert (actors != NULL);
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g_hash_table_remove (actors, actor);
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if (g_hash_table_size (actors) == 0)
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g_object_set_qdata (obj, quark_content_actors, NULL);
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g_signal_emit (content, content_signals[DETACHED], 0, actor);
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}
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/*< private >
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* _clutter_content_paint_content:
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* @content: a #ClutterContent
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* @actor: a #ClutterActor
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* @context: a #ClutterPaintNode
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*
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* Creates the render tree for the @content and @actor.
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*
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* This function will invoke the #ClutterContentIface.paint_content()
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* virtual function.
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*/
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void
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_clutter_content_paint_content (ClutterContent *content,
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ClutterActor *actor,
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ClutterPaintNode *node)
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{
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CLUTTER_CONTENT_GET_IFACE (content)->paint_content (content, actor, node);
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}
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/**
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* clutter_content_get_preferred_size:
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* @content: a #ClutterContent
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* @width: (out): return location for the natural width of the content
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* @height: (out): return location for the natural height of the content
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*
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* Retrieves the natural size of the @content, if any.
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*
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* The natural size of a #ClutterContent is defined as the size the content
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* would have regardless of the allocation of the actor that is painting it,
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* for instance the size of an image data.
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*
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* Return value: %TRUE if the content has a preferred size, and %FALSE
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* otherwise
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*
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* Since: 1.10
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*/
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gboolean
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clutter_content_get_preferred_size (ClutterContent *content,
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gfloat *width,
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gfloat *height)
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{
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g_return_val_if_fail (CLUTTER_IS_CONTENT (content), FALSE);
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return CLUTTER_CONTENT_GET_IFACE (content)->get_preferred_size (content,
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width,
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height);
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}
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