/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2009 Intel Corporation.
*
* 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-bin-layout
* @short_description: A simple layout manager
*
* #ClutterBinLayout is a layout manager which implements the following
* policy:
*
* - the preferred size is the maximum preferred size
* between all the children of the container using the
* layout;
* - each child is allocated in "layers", on on top
* of the other;
* - for each layer there are horizontal and vertical
* alignment policies.
*
* The [bin-layout example](https://git.gnome.org/browse/clutter/tree/examples/bin-layout.c?h=clutter-1.18)
* shows how to pack actors inside a #ClutterBinLayout.
*
* #ClutterBinLayout is available since Clutter 1.2
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#define CLUTTER_DISABLE_DEPRECATION_WARNINGS
#include "deprecated/clutter-container.h"
#include "deprecated/clutter-bin-layout.h"
#include "clutter-actor-private.h"
#include "clutter-animatable.h"
#include "clutter-child-meta.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-layout-meta.h"
#include "clutter-private.h"
#define CLUTTER_TYPE_BIN_LAYER (clutter_bin_layer_get_type ())
#define CLUTTER_BIN_LAYER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_BIN_LAYER, ClutterBinLayer))
#define CLUTTER_IS_BIN_LAYER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_BIN_LAYER))
typedef struct _ClutterBinLayer ClutterBinLayer;
typedef struct _ClutterLayoutMetaClass ClutterBinLayerClass;
struct _ClutterBinLayoutPrivate
{
ClutterBinAlignment x_align;
ClutterBinAlignment y_align;
ClutterContainer *container;
};
struct _ClutterBinLayer
{
ClutterLayoutMeta parent_instance;
ClutterBinAlignment x_align;
ClutterBinAlignment y_align;
};
enum
{
PROP_LAYER_0,
PROP_LAYER_X_ALIGN,
PROP_LAYER_Y_ALIGN,
PROP_LAYER_LAST
};
enum
{
PROP_0,
PROP_X_ALIGN,
PROP_Y_ALIGN,
PROP_LAST
};
static GParamSpec *layer_props[PROP_LAYER_LAST] = { NULL, };
static GParamSpec *bin_props[PROP_LAST] = { NULL, };
GType clutter_bin_layer_get_type (void);
G_DEFINE_TYPE (ClutterBinLayer,
clutter_bin_layer,
CLUTTER_TYPE_LAYOUT_META)
G_DEFINE_TYPE_WITH_PRIVATE (ClutterBinLayout,
clutter_bin_layout,
CLUTTER_TYPE_LAYOUT_MANAGER)
/*
* ClutterBinLayer
*/
static void
set_layer_x_align (ClutterBinLayer *self,
ClutterBinAlignment alignment)
{
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
if (self->x_align == alignment)
return;
self->x_align = alignment;
meta = CLUTTER_LAYOUT_META (self);
manager = clutter_layout_meta_get_manager (meta);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (self), layer_props[PROP_LAYER_X_ALIGN]);
}
static void
set_layer_y_align (ClutterBinLayer *self,
ClutterBinAlignment alignment)
{
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
if (self->y_align == alignment)
return;
self->y_align = alignment;
meta = CLUTTER_LAYOUT_META (self);
manager = clutter_layout_meta_get_manager (meta);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (self), layer_props[PROP_LAYER_Y_ALIGN]);
}
static void
clutter_bin_layer_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBinLayer *layer = CLUTTER_BIN_LAYER (gobject);
switch (prop_id)
{
case PROP_LAYER_X_ALIGN:
set_layer_x_align (layer, g_value_get_enum (value));
break;
case PROP_LAYER_Y_ALIGN:
set_layer_y_align (layer, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_bin_layer_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBinLayer *layer = CLUTTER_BIN_LAYER (gobject);
switch (prop_id)
{
case PROP_LAYER_X_ALIGN:
g_value_set_enum (value, layer->x_align);
break;
case PROP_LAYER_Y_ALIGN:
g_value_set_enum (value, layer->y_align);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_bin_layer_class_init (ClutterBinLayerClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = clutter_bin_layer_set_property;
gobject_class->get_property = clutter_bin_layer_get_property;
layer_props[PROP_LAYER_X_ALIGN] =
g_param_spec_enum ("x-align",
P_("Horizontal Alignment"),
P_("Horizontal alignment for the actor "
"inside the layout manager"),
CLUTTER_TYPE_BIN_ALIGNMENT,
CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
layer_props[PROP_LAYER_Y_ALIGN] =
g_param_spec_enum ("y-align",
P_("Vertical Alignment"),
P_("Vertical alignment for the actor "
"inside the layout manager"),
CLUTTER_TYPE_BIN_ALIGNMENT,
CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
g_object_class_install_properties (gobject_class,
PROP_LAYER_LAST,
layer_props);
}
static void
clutter_bin_layer_init (ClutterBinLayer *layer)
{
layer->x_align = CLUTTER_BIN_ALIGNMENT_CENTER;
layer->y_align = CLUTTER_BIN_ALIGNMENT_CENTER;
}
/*
* ClutterBinLayout
*/
static void
set_x_align (ClutterBinLayout *self,
ClutterBinAlignment alignment)
{
ClutterBinLayoutPrivate *priv = self->priv;
if (priv->x_align != alignment)
{
ClutterLayoutManager *manager;
priv->x_align = alignment;
manager = CLUTTER_LAYOUT_MANAGER (self);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (self), bin_props[PROP_X_ALIGN]);
}
}
static void
set_y_align (ClutterBinLayout *self,
ClutterBinAlignment alignment)
{
ClutterBinLayoutPrivate *priv = self->priv;
if (priv->y_align != alignment)
{
ClutterLayoutManager *manager;
priv->y_align = alignment;
manager = CLUTTER_LAYOUT_MANAGER (self);
clutter_layout_manager_layout_changed (manager);
g_object_notify_by_pspec (G_OBJECT (self), bin_props[PROP_Y_ALIGN]);
}
}
static void
clutter_bin_layout_get_preferred_width (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_height,
gfloat *min_width_p,
gfloat *nat_width_p)
{
ClutterActor *actor = CLUTTER_ACTOR (container);
ClutterActorIter iter;
ClutterActor *child;
gfloat min_width, nat_width;
min_width = nat_width = 0.0;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
gfloat minimum, natural;
if (!clutter_actor_is_visible (child))
continue;
clutter_actor_get_preferred_width (child, for_height,
&minimum,
&natural);
min_width = MAX (min_width, minimum);
nat_width = MAX (nat_width, natural);
}
if (min_width_p)
*min_width_p = min_width;
if (nat_width_p)
*nat_width_p = nat_width;
}
static void
clutter_bin_layout_get_preferred_height (ClutterLayoutManager *manager,
ClutterContainer *container,
gfloat for_width,
gfloat *min_height_p,
gfloat *nat_height_p)
{
ClutterActor *actor = CLUTTER_ACTOR (container);
ClutterActorIter iter;
ClutterActor *child;
gfloat min_height, nat_height;
min_height = nat_height = 0.0;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
gfloat minimum, natural;
if (!clutter_actor_is_visible (child))
continue;
clutter_actor_get_preferred_height (child, for_width,
&minimum,
&natural);
min_height = MAX (min_height, minimum);
nat_height = MAX (nat_height, natural);
}
if (min_height_p)
*min_height_p = min_height;
if (nat_height_p)
*nat_height_p = nat_height;
}
static gdouble
get_bin_alignment_factor (ClutterBinAlignment alignment,
ClutterTextDirection text_dir)
{
switch (alignment)
{
case CLUTTER_BIN_ALIGNMENT_CENTER:
return 0.5;
case CLUTTER_BIN_ALIGNMENT_START:
return text_dir == CLUTTER_TEXT_DIRECTION_LTR ? 0.0 : 1.0;
case CLUTTER_BIN_ALIGNMENT_END:
return text_dir == CLUTTER_TEXT_DIRECTION_LTR ? 1.0 : 0.0;
case CLUTTER_BIN_ALIGNMENT_FIXED:
case CLUTTER_BIN_ALIGNMENT_FILL:
return 0.0;
}
return 0.0;
}
static gdouble
get_actor_align_factor (ClutterActorAlign alignment)
{
switch (alignment)
{
case CLUTTER_ACTOR_ALIGN_CENTER:
return 0.5;
case CLUTTER_ACTOR_ALIGN_START:
return 0.0;
case CLUTTER_ACTOR_ALIGN_END:
return 1.0;
case CLUTTER_ACTOR_ALIGN_FILL:
return 0.0;
}
return 0.0;
}
static void
clutter_bin_layout_allocate (ClutterLayoutManager *manager,
ClutterContainer *container,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags)
{
gfloat allocation_x, allocation_y;
gfloat available_w, available_h;
ClutterActor *actor, *child;
ClutterActorIter iter;
clutter_actor_box_get_origin (allocation, &allocation_x, &allocation_y);
clutter_actor_box_get_size (allocation, &available_w, &available_h);
actor = CLUTTER_ACTOR (container);
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
ClutterLayoutMeta *meta;
ClutterBinLayer *layer;
ClutterActorBox child_alloc = { 0, };
gdouble x_align, y_align;
gboolean x_fill, y_fill, is_fixed_position_set;
float fixed_x, fixed_y;
if (!clutter_actor_is_visible (child))
continue;
meta = clutter_layout_manager_get_child_meta (manager,
container,
child);
layer = CLUTTER_BIN_LAYER (meta);
fixed_x = fixed_y = 0.f;
g_object_get (child,
"fixed-position-set", &is_fixed_position_set,
"fixed-x", &fixed_x,
"fixed-y", &fixed_y,
NULL);
/* XXX:2.0 - remove the FIXED alignment, and just use the fixed position
* of the actor if one is set
*/
if (is_fixed_position_set ||
layer->x_align == CLUTTER_BIN_ALIGNMENT_FIXED)
{
if (is_fixed_position_set)
child_alloc.x1 = fixed_x;
else
child_alloc.x1 = clutter_actor_get_x (child);
}
else
child_alloc.x1 = allocation_x;
if (is_fixed_position_set ||
layer->y_align == CLUTTER_BIN_ALIGNMENT_FIXED)
{
if (is_fixed_position_set)
child_alloc.y1 = fixed_y;
else
child_alloc.y1 = clutter_actor_get_y (child);
}
else
child_alloc.y1 = allocation_y;
child_alloc.x2 = allocation_x + available_w;
child_alloc.y2 = allocation_y + available_h;
if (clutter_actor_needs_expand (child, CLUTTER_ORIENTATION_HORIZONTAL))
{
ClutterActorAlign align;
align = clutter_actor_get_x_align (child);
x_fill = align == CLUTTER_ACTOR_ALIGN_FILL;
x_align = get_actor_align_factor (align);
}
else
{
ClutterTextDirection text_dir;
x_fill = (layer->x_align == CLUTTER_BIN_ALIGNMENT_FILL);
text_dir = clutter_actor_get_text_direction (child);
if (!is_fixed_position_set)
x_align = get_bin_alignment_factor (layer->x_align, text_dir);
else
x_align = 0.0;
}
if (clutter_actor_needs_expand (child, CLUTTER_ORIENTATION_VERTICAL))
{
ClutterActorAlign align;
align = clutter_actor_get_y_align (child);
y_fill = align == CLUTTER_ACTOR_ALIGN_FILL;
y_align = get_actor_align_factor (align);
}
else
{
y_fill = (layer->y_align == CLUTTER_BIN_ALIGNMENT_FILL);
if (!is_fixed_position_set)
y_align = get_bin_alignment_factor (layer->y_align,
CLUTTER_TEXT_DIRECTION_LTR);
else
y_align = 0.0;
}
clutter_actor_allocate_align_fill (child, &child_alloc,
x_align, y_align,
x_fill, y_fill,
flags);
}
}
static GType
clutter_bin_layout_get_child_meta_type (ClutterLayoutManager *manager)
{
return CLUTTER_TYPE_BIN_LAYER;
}
static ClutterLayoutMeta *
clutter_bin_layout_create_child_meta (ClutterLayoutManager *manager,
ClutterContainer *container,
ClutterActor *actor)
{
ClutterBinLayoutPrivate *priv;
priv = CLUTTER_BIN_LAYOUT (manager)->priv;
return g_object_new (CLUTTER_TYPE_BIN_LAYER,
"container", container,
"actor", actor,
"manager", manager,
"x-align", priv->x_align,
"y_align", priv->y_align,
NULL);
}
static void
clutter_bin_layout_set_container (ClutterLayoutManager *manager,
ClutterContainer *container)
{
ClutterBinLayoutPrivate *priv;
ClutterLayoutManagerClass *parent_class;
priv = CLUTTER_BIN_LAYOUT (manager)->priv;
priv->container = container;
parent_class = CLUTTER_LAYOUT_MANAGER_CLASS (clutter_bin_layout_parent_class);
parent_class->set_container (manager, container);
}
static void
clutter_bin_layout_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBinLayout *layout = CLUTTER_BIN_LAYOUT (gobject);
switch (prop_id)
{
case PROP_X_ALIGN:
set_x_align (layout, g_value_get_enum (value));
break;
case PROP_Y_ALIGN:
set_y_align (layout, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_bin_layout_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBinLayoutPrivate *priv;
priv = CLUTTER_BIN_LAYOUT (gobject)->priv;
switch (prop_id)
{
case PROP_X_ALIGN:
g_value_set_enum (value, priv->x_align);
break;
case PROP_Y_ALIGN:
g_value_set_enum (value, priv->y_align);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_bin_layout_class_init (ClutterBinLayoutClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterLayoutManagerClass *layout_class =
CLUTTER_LAYOUT_MANAGER_CLASS (klass);
/**
* ClutterBinLayout:x-align:
*
* The default horizontal alignment policy for actors managed
* by the #ClutterBinLayout
*
* Since: 1.2
*
* Deprecated: 1.12: Use the #ClutterActor:x-expand and the
* #ClutterActor:x-align properties on #ClutterActor instead.
*/
bin_props[PROP_X_ALIGN] =
g_param_spec_enum ("x-align",
P_("Horizontal Alignment"),
P_("Default horizontal alignment for the actors "
"inside the layout manager"),
CLUTTER_TYPE_BIN_ALIGNMENT,
CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
/**
* ClutterBinLayout:y-align:
*
* The default vertical alignment policy for actors managed
* by the #ClutterBinLayout
*
* Since: 1.2
*
* Deprecated: 1.12: Use the #ClutterActor:y-expand and the
* #ClutterActor:y-align properties on #ClutterActor instead.
*/
bin_props[PROP_Y_ALIGN] =
g_param_spec_enum ("y-align",
P_("Vertical Alignment"),
P_("Default vertical alignment for the actors "
"inside the layout manager"),
CLUTTER_TYPE_BIN_ALIGNMENT,
CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
gobject_class->set_property = clutter_bin_layout_set_property;
gobject_class->get_property = clutter_bin_layout_get_property;
g_object_class_install_properties (gobject_class, PROP_LAST, bin_props);
layout_class->get_preferred_width = clutter_bin_layout_get_preferred_width;
layout_class->get_preferred_height = clutter_bin_layout_get_preferred_height;
layout_class->allocate = clutter_bin_layout_allocate;
layout_class->create_child_meta = clutter_bin_layout_create_child_meta;
layout_class->get_child_meta_type = clutter_bin_layout_get_child_meta_type;
layout_class->set_container = clutter_bin_layout_set_container;
}
static void
clutter_bin_layout_init (ClutterBinLayout *self)
{
self->priv = clutter_bin_layout_get_instance_private (self);
self->priv->x_align = CLUTTER_BIN_ALIGNMENT_CENTER;
self->priv->y_align = CLUTTER_BIN_ALIGNMENT_CENTER;
}
/**
* clutter_bin_layout_new:
* @x_align: the default alignment policy to be used on the
* horizontal axis
* @y_align: the default alignment policy to be used on the
* vertical axis
*
* Creates a new #ClutterBinLayout layout manager
*
* Return value: the newly created layout manager
*
* Since: 1.2
*/
ClutterLayoutManager *
clutter_bin_layout_new (ClutterBinAlignment x_align,
ClutterBinAlignment y_align)
{
return g_object_new (CLUTTER_TYPE_BIN_LAYOUT,
"x-align", x_align,
"y-align", y_align,
NULL);
}
/**
* clutter_bin_layout_set_alignment:
* @self: a #ClutterBinLayout
* @child: (allow-none): a child of @container
* @x_align: the horizontal alignment policy to be used for the @child
* inside @container
* @y_align: the vertical aligment policy to be used on the @child
* inside @container
*
* Sets the horizontal and vertical alignment policies to be applied
* to a @child of @self
*
* If @child is %NULL then the @x_align and @y_align values will
* be set as the default alignment policies
*
* Since: 1.2
*
* Deprecated: 1.12: Use the #ClutterActor:x-align and
* #ClutterActor:y-align properties of #ClutterActor instead.
*/
void
clutter_bin_layout_set_alignment (ClutterBinLayout *self,
ClutterActor *child,
ClutterBinAlignment x_align,
ClutterBinAlignment y_align)
{
ClutterBinLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_if_fail (CLUTTER_IS_BIN_LAYOUT (self));
g_return_if_fail (child == NULL || CLUTTER_IS_ACTOR (child));
priv = self->priv;
if (priv->container == NULL)
{
if (child == NULL)
{
set_x_align (self, x_align);
set_y_align (self, y_align);
}
else
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before setting the alignment "
"on its children",
G_OBJECT_TYPE_NAME (self));
return;
}
manager = CLUTTER_LAYOUT_MANAGER (self);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
child);
g_assert (CLUTTER_IS_BIN_LAYER (meta));
set_layer_x_align (CLUTTER_BIN_LAYER (meta), x_align);
set_layer_y_align (CLUTTER_BIN_LAYER (meta), y_align);
}
/**
* clutter_bin_layout_get_alignment:
* @self: a #ClutterBinLayout
* @child: (allow-none): a child of @container
* @x_align: (out) (allow-none): return location for the horizontal
* alignment policy
* @y_align: (out) (allow-none): return location for the vertical
* alignment policy
*
* Retrieves the horizontal and vertical alignment policies for
* a child of @self
*
* If @child is %NULL the default alignment policies will be returned
* instead
*
* Since: 1.2
*
* Deprecated: 1.12: Use the #ClutterActor:x-align and the
* #ClutterActor:y-align properties of #ClutterActor instead.
*/
void
clutter_bin_layout_get_alignment (ClutterBinLayout *self,
ClutterActor *child,
ClutterBinAlignment *x_align,
ClutterBinAlignment *y_align)
{
ClutterBinLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
ClutterBinLayer *layer;
g_return_if_fail (CLUTTER_IS_BIN_LAYOUT (self));
priv = self->priv;
if (priv->container == NULL)
{
if (child == NULL)
{
if (x_align)
*x_align = priv->x_align;
if (y_align)
*y_align = priv->y_align;
}
else
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before getting the alignment "
"of its children",
G_OBJECT_TYPE_NAME (self));
return;
}
manager = CLUTTER_LAYOUT_MANAGER (self);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
child);
g_assert (CLUTTER_IS_BIN_LAYER (meta));
layer = CLUTTER_BIN_LAYER (meta);
if (x_align)
*x_align = layer->x_align;
if (y_align)
*y_align = layer->y_align;
}
/**
* clutter_bin_layout_add:
* @self: a #ClutterBinLayout
* @child: a #ClutterActor
* @x_align: horizontal alignment policy for @child
* @y_align: vertical alignment policy for @child
*
* Adds a #ClutterActor to the container using @self and
* sets the alignment policies for it
*
* This function is equivalent to clutter_container_add_actor()
* and clutter_layout_manager_child_set_property() but it does not
* require a pointer to the #ClutterContainer associated to the
* #ClutterBinLayout
*
* Since: 1.2
*
* Deprecated: 1.12: Use clutter_actor_add_child() instead.
*/
void
clutter_bin_layout_add (ClutterBinLayout *self,
ClutterActor *child,
ClutterBinAlignment x_align,
ClutterBinAlignment y_align)
{
ClutterBinLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_if_fail (CLUTTER_IS_BIN_LAYOUT (self));
g_return_if_fail (CLUTTER_IS_ACTOR (child));
priv = self->priv;
if (priv->container == NULL)
{
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before adding children",
G_OBJECT_TYPE_NAME (self));
return;
}
clutter_container_add_actor (priv->container, child);
manager = CLUTTER_LAYOUT_MANAGER (self);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
child);
g_assert (CLUTTER_IS_BIN_LAYER (meta));
set_layer_x_align (CLUTTER_BIN_LAYER (meta), x_align);
set_layer_y_align (CLUTTER_BIN_LAYER (meta), y_align);
}