7051fe275d
The ChildMeta object is a storage for child-container properties, that is properties that exist only when an actor is inside a specific container. The LayoutManager delegate class should also have layout-specific properties -- so, for this job, we can "recycle" ChildMeta as the storage.
656 lines
21 KiB
C
656 lines
21 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) 2009 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-layout-manager
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* @short_description: Layout managers base class
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*
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* #ClutterLayoutManager is a base abstract class for layout managers. A
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* layout manager implements the layouting policy for a composite or a
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* container actor: it controls the preferred size of the actor to which
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* it has been paired, and it controls the allocation of its children.
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*
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* Any composite or container #ClutterActor subclass can delegate the
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* layouting of its children to a #ClutterLayoutManager. Clutter provides
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* a generic container using #ClutterLayoutManager called #ClutterBox.
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*
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* Clutter provides some simple #ClutterLayoutManager sub-classes, like
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* #ClutterFixedLayout and #ClutterBinLayout.
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*
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* #ClutterLayoutManager is available since Clutter 1.2
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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 <glib-object.h>
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#include <gobject/gvaluecollector.h>
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#include "clutter-debug.h"
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#include "clutter-layout-manager.h"
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#include "clutter-marshal.h"
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#include "clutter-private.h"
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#define LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED(m,method) G_STMT_START { \
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GObject *_obj = G_OBJECT (m); \
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g_warning ("Layout managers of type %s do not implement " \
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"the ClutterLayoutManager::%s method", \
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G_OBJECT_TYPE_NAME (_obj), \
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(method)); } G_STMT_END
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enum
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{
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LAYOUT_CHANGED,
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LAST_SIGNAL
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};
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G_DEFINE_ABSTRACT_TYPE (ClutterLayoutManager,
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clutter_layout_manager,
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G_TYPE_INITIALLY_UNOWNED);
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static GQuark quark_layout_meta = 0;
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static guint manager_signals[LAST_SIGNAL] = { 0, };
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static void
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layout_manager_real_get_preferred_width (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_height,
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gfloat *min_width_p,
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gfloat *nat_width_p)
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{
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LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "get_preferred_width");
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if (min_width_p)
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*min_width_p = 0.0;
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if (nat_width_p)
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*nat_width_p = 0.0;
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}
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static void
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layout_manager_real_get_preferred_height (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_width,
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gfloat *min_height_p,
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gfloat *nat_height_p)
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{
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LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "get_preferred_height");
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if (min_height_p)
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*min_height_p = 0.0;
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if (nat_height_p)
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*nat_height_p = 0.0;
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}
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static void
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layout_manager_real_allocate (ClutterLayoutManager *manager,
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ClutterContainer *container,
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const ClutterActorBox *allocation,
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ClutterAllocationFlags flags)
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{
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LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "allocate");
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}
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static ClutterChildMeta *
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layout_manager_real_create_child_meta (ClutterLayoutManager *manager,
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ClutterContainer *container,
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ClutterActor *actor)
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{
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return NULL;
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}
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static void
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clutter_layout_manager_class_init (ClutterLayoutManagerClass *klass)
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{
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quark_layout_meta =
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g_quark_from_static_string ("clutter-layout-manager-child-meta");
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klass->get_preferred_width = layout_manager_real_get_preferred_width;
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klass->get_preferred_height = layout_manager_real_get_preferred_height;
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klass->allocate = layout_manager_real_allocate;
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klass->create_child_meta = layout_manager_real_create_child_meta;
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/**
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* ClutterLayoutManager::layout-changed:
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* @manager: the #ClutterLayoutManager that emitted the signal
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*
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* The ::layout-changed signal is emitted each time a layout manager
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* has been changed. Every #ClutterActor using the @manager instance
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* as a layout manager should connect a handler to the ::layout-changed
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* signal and queue a relayout on themselves:
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*
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* |[
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* static void layout_changed (ClutterLayoutManager *manager,
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* ClutterActor *self)
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* {
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* clutter_actor_queue_relayout (self);
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* }
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* ...
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* self->manager = g_object_ref_sink (manager);
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* g_signal_connect (self->manager, "layout-changed",
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* G_CALLBACK (layout_changed),
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* self);
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* ]|
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*
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* Sub-classes of #ClutterLayoutManager that implement a layout that
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* can be controlled or changed using parameters should emit the
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* ::layout-changed signal whenever one of the parameters changes,
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* by using clutter_layout_manager_layout_changed().
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*
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* Since: 1.2
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*/
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manager_signals[LAYOUT_CHANGED] =
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g_signal_new (I_("layout-changed"),
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (ClutterLayoutManagerClass,
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layout_changed),
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NULL, NULL,
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clutter_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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}
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static void
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clutter_layout_manager_init (ClutterLayoutManager *manager)
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{
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}
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/**
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* clutter_layout_manager_get_preferred_width:
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* @manager: a #ClutterLayoutManager
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* @container: the #ClutterContainer using @manager
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* @for_height: the height for which the width should be computed, or -1
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* @min_width_p: (out) (allow-none): return location for the minimum width
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* of the layout, or %NULL
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* @nat_width_p: (out) (allow-none): return location for the natural width
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* of the layout, or %NULL
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*
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* Computes the minimum and natural widths of the @container according
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* to @manager.
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*
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* See also clutter_actor_get_preferred_width()
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*
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* Since: 1.2
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*/
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void
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clutter_layout_manager_get_preferred_width (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_height,
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gfloat *min_width_p,
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gfloat *nat_width_p)
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{
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ClutterLayoutManagerClass *klass;
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g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
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g_return_if_fail (CLUTTER_IS_CONTAINER (container));
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klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
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klass->get_preferred_width (manager, container, for_height,
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min_width_p,
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nat_width_p);
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}
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/**
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* clutter_layout_manager_get_preferred_height:
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* @manager: a #ClutterLayoutManager
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* @container: the #ClutterContainer using @manager
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* @for_width: the width for which the height should be computed, or -1
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* @min_height_p: (out) (allow-none): return location for the minimum height
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* of the layout, or %NULL
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* @nat_height_p: (out) (allow-none): return location for the natural height
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* of the layout, or %NULL
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*
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* Computes the minimum and natural heights of the @container according
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* to @manager.
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*
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* See also clutter_actor_get_preferred_height()
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*
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* Since: 1.2
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*/
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void
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clutter_layout_manager_get_preferred_height (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_width,
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gfloat *min_height_p,
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gfloat *nat_height_p)
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{
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ClutterLayoutManagerClass *klass;
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g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
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g_return_if_fail (CLUTTER_IS_CONTAINER (container));
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klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
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klass->get_preferred_height (manager, container, for_width,
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min_height_p,
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nat_height_p);
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}
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/**
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* clutter_layout_manager_allocate:
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* @manager: a #ClutterLayoutManager
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* @container: the #ClutterContainer using @manager
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* @allocation: the #ClutterActorBox containing the allocated area
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* of @container
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* @flags: the allocation flags
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*
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* Allocates the children of @container given an area
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*
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* See also clutter_actor_allocate()
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*
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* Since: 1.2
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*/
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void
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clutter_layout_manager_allocate (ClutterLayoutManager *manager,
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ClutterContainer *container,
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const ClutterActorBox *allocation,
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ClutterAllocationFlags flags)
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{
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ClutterLayoutManagerClass *klass;
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g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
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g_return_if_fail (CLUTTER_IS_CONTAINER (container));
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g_return_if_fail (allocation != NULL);
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klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
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klass->allocate (manager, container, allocation, flags);
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}
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/**
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* clutter_layout_manager_layout_changed:
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* @manager: a #ClutterLayoutManager
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*
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* Emits the #ClutterLayoutManager::layout-changed signal on @manager
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*
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* This function should only be called by implementations of the
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* #ClutterLayoutManager class
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*
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* Since: 1.2
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*/
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void
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clutter_layout_manager_layout_changed (ClutterLayoutManager *manager)
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{
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g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
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g_signal_emit (manager, manager_signals[LAYOUT_CHANGED], 0);
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}
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static inline ClutterChildMeta *
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create_child_meta (ClutterLayoutManager *manager,
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ClutterContainer *container,
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ClutterActor *actor)
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{
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ClutterLayoutManagerClass *klass;
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klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
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return klass->create_child_meta (manager, container, actor);
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}
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static inline ClutterChildMeta *
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get_child_meta (ClutterLayoutManager *manager,
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ClutterContainer *container,
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ClutterActor *actor)
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{
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ClutterChildMeta *meta;
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meta = g_object_get_qdata (G_OBJECT (actor), quark_layout_meta);
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if (meta != NULL &&
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meta->container == container &&
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meta->actor == actor)
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return meta;
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return NULL;
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}
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/**
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* clutter_layout_manager_get_child_meta:
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* @manager: a #ClutterLayoutManager
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* @container: a #ClutterContainer using @manager
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* @actor: a #ClutterActor child of @container
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*
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* Retrieves the #ClutterChildMeta that the layout @manager associated
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* to the @actor child of @container
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*
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* Return value: a #ClutterChildMeta or %NULL
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*
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* Since: 1.0
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*/
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ClutterChildMeta *
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clutter_layout_manager_get_child_meta (ClutterLayoutManager *manager,
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ClutterContainer *container,
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ClutterActor *actor)
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{
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g_return_val_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager), NULL);
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g_return_val_if_fail (CLUTTER_IS_CONTAINER (container), NULL);
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g_return_val_if_fail (CLUTTER_IS_ACTOR (actor), NULL);
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return get_child_meta (manager, container, actor);
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}
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void
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clutter_layout_manager_add_child_meta (ClutterLayoutManager *manager,
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ClutterContainer *container,
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ClutterActor *actor)
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{
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ClutterChildMeta *meta;
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meta = create_child_meta (manager, container, actor);
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if (meta == NULL)
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return;
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g_object_set_qdata_full (G_OBJECT (actor), quark_layout_meta,
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meta,
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(GDestroyNotify) g_object_unref);
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}
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void
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clutter_layout_manager_remove_child_meta (ClutterLayoutManager *manager,
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ClutterContainer *container,
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ClutterActor *actor)
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{
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ClutterChildMeta *meta;
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g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
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g_return_if_fail (CLUTTER_IS_CONTAINER (container));
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g_return_if_fail (CLUTTER_IS_ACTOR (actor));
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if (get_child_meta (manager, container, actor))
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g_object_set_qdata (G_OBJECT (actor), quark_layout_meta, NULL);
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}
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static inline gboolean
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layout_set_property_internal (ClutterLayoutManager *manager,
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GObject *gobject,
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GParamSpec *pspec,
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const GValue *value)
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{
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if (pspec->flags & G_PARAM_CONSTRUCT_ONLY)
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{
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g_warning ("%s: Child property '%s' of the layout manager of "
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"type '%s' is constructor-only",
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G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (manager));
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return FALSE;
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}
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if (!(pspec->flags & G_PARAM_WRITABLE))
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{
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g_warning ("%s: Child property '%s' of the layout manager of "
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"type '%s' is not writable",
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G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (manager));
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return FALSE;
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}
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g_object_set_property (gobject, pspec->name, value);
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return TRUE;
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}
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static inline gboolean
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layout_get_property_internal (ClutterLayoutManager *manager,
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GObject *gobject,
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GParamSpec *pspec,
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GValue *value)
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{
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if (!(pspec->flags & G_PARAM_READABLE))
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{
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g_warning ("%s: Child property '%s' of the layout manager of "
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"type '%s' is not readable",
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G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (manager));
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return FALSE;
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}
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g_object_get_property (gobject, pspec->name, value);
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return TRUE;
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}
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void
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clutter_layout_manager_child_set (ClutterLayoutManager *manager,
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ClutterContainer *container,
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ClutterActor *actor,
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const gchar *first_property,
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...)
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{
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ClutterChildMeta *meta;
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GObjectClass *klass;
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const gchar *pname;
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va_list var_args;
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g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
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g_return_if_fail (CLUTTER_IS_CONTAINER (container));
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g_return_if_fail (CLUTTER_IS_ACTOR (actor));
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g_return_if_fail (first_property != NULL);
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meta = get_child_meta (manager, container, actor);
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if (meta == NULL)
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{
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g_warning ("Layout managers of type '%s' do not support "
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"child metadata",
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g_type_name (G_OBJECT_TYPE (manager)));
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return;
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}
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klass = G_OBJECT_GET_CLASS (meta);
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va_start (var_args, first_property);
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pname = first_property;
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while (pname)
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{
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GValue value = { 0, };
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GParamSpec *pspec;
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gchar *error;
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gboolean res;
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pspec = g_object_class_find_property (klass, pname);
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if (pspec == NULL)
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{
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g_warning ("%s: Layout managers of type '%s' have no child "
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"property named '%s'",
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G_STRLOC, G_OBJECT_TYPE_NAME (manager), pname);
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break;
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}
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g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
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G_VALUE_COLLECT (&value, var_args, 0, &error);
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if (error)
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{
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g_warning ("%s: %s", G_STRLOC, error);
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g_free (error);
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break;
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}
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res = layout_set_property_internal (manager, G_OBJECT (meta),
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pspec,
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&value);
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g_value_unset (&value);
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if (!res)
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break;
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pname = va_arg (var_args, gchar*);
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}
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va_end (var_args);
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}
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void
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clutter_layout_manager_child_set_property (ClutterLayoutManager *manager,
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ClutterContainer *container,
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ClutterActor *actor,
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const gchar *property_name,
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const GValue *value)
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{
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ClutterChildMeta *meta;
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GObjectClass *klass;
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GParamSpec *pspec;
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g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
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g_return_if_fail (CLUTTER_IS_CONTAINER (container));
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g_return_if_fail (CLUTTER_IS_ACTOR (actor));
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g_return_if_fail (property_name != NULL);
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g_return_if_fail (value != NULL);
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meta = get_child_meta (manager, container, actor);
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if (meta == NULL)
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{
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g_warning ("Layout managers of type '%s' do not support "
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"child metadata",
|
|
g_type_name (G_OBJECT_TYPE (manager)));
|
|
return;
|
|
}
|
|
|
|
klass = G_OBJECT_GET_CLASS (meta);
|
|
|
|
pspec = g_object_class_find_property (klass, property_name);
|
|
if (pspec == NULL)
|
|
{
|
|
g_warning ("%s: Layout managers of type '%s' have no child "
|
|
"property named '%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (manager), property_name);
|
|
return;
|
|
}
|
|
|
|
layout_set_property_internal (manager, G_OBJECT (meta), pspec, value);
|
|
}
|
|
|
|
void
|
|
clutter_layout_manager_child_get (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
ClutterActor *actor,
|
|
const gchar *first_property,
|
|
...)
|
|
{
|
|
ClutterChildMeta *meta;
|
|
GObjectClass *klass;
|
|
const gchar *pname;
|
|
va_list var_args;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
|
|
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
|
|
g_return_if_fail (first_property != NULL);
|
|
|
|
meta = get_child_meta (manager, container, actor);
|
|
if (meta == NULL)
|
|
{
|
|
g_warning ("Layout managers of type '%s' do not support "
|
|
"child metadata",
|
|
g_type_name (G_OBJECT_TYPE (manager)));
|
|
return;
|
|
}
|
|
|
|
klass = G_OBJECT_GET_CLASS (meta);
|
|
|
|
va_start (var_args, first_property);
|
|
|
|
pname = first_property;
|
|
while (pname)
|
|
{
|
|
GValue value = { 0, };
|
|
GParamSpec *pspec;
|
|
gchar *error;
|
|
gboolean res;
|
|
|
|
pspec = g_object_class_find_property (klass, pname);
|
|
if (pspec == NULL)
|
|
{
|
|
g_warning ("%s: Layout managers of type '%s' have no child "
|
|
"property named '%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (manager), pname);
|
|
break;
|
|
}
|
|
|
|
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
|
|
|
|
res = layout_get_property_internal (manager, G_OBJECT (meta),
|
|
pspec,
|
|
&value);
|
|
if (!res)
|
|
{
|
|
g_value_unset (&value);
|
|
break;
|
|
}
|
|
|
|
G_VALUE_LCOPY (&value, var_args, 0, &error);
|
|
if (error)
|
|
{
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
g_value_unset (&value);
|
|
break;
|
|
}
|
|
|
|
g_value_unset (&value);
|
|
|
|
pname = va_arg (var_args, gchar*);
|
|
}
|
|
|
|
va_end (var_args);
|
|
}
|
|
|
|
void
|
|
clutter_layout_manager_child_get_property (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
ClutterActor *actor,
|
|
const gchar *property_name,
|
|
GValue *value)
|
|
{
|
|
ClutterChildMeta *meta;
|
|
GObjectClass *klass;
|
|
GParamSpec *pspec;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
|
|
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
|
|
g_return_if_fail (property_name != NULL);
|
|
g_return_if_fail (value != NULL);
|
|
|
|
meta = get_child_meta (manager, container, actor);
|
|
if (meta == NULL)
|
|
{
|
|
g_warning ("Layout managers of type %s do not support "
|
|
"child metadata",
|
|
g_type_name (G_OBJECT_TYPE (manager)));
|
|
return;
|
|
}
|
|
|
|
klass = G_OBJECT_GET_CLASS (meta);
|
|
|
|
pspec = g_object_class_find_property (klass, property_name);
|
|
if (pspec == NULL)
|
|
{
|
|
g_warning ("%s: Layout managers of type '%s' have no child "
|
|
"property named '%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (manager), property_name);
|
|
return;
|
|
}
|
|
|
|
layout_get_property_internal (manager, G_OBJECT (meta), pspec, value);
|
|
}
|