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mutter/clutter/clutter-box-layout.c
Emmanuele Bassi f0b434918b docs: Add images for layout managers 
It's easier to show the layout manager policy with a simple
screen shot coming from our interactive tests.
2009-10-23 17:32:18 +01:00

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/*
* 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>
*
* Based on the NBTK NbtkBoxLayout actor by:
* Thomas Wood <thomas.wood@intel.com>
*/
/**
* SECTION:clutter-box-layout
* @short_description: A layout manager arranging children on a single line
*
* The #ClutterBoxLayout is a #ClutterLayoutManager implementing the
* following layout policy:
* <itemizedlist>
* <listitem><para>all children are arranged on a single
* line;</para></listitem>
* <listitem><para>the axis used is controlled by the
* #ClutterBoxLayout:vertical boolean property;</para></listitem>
* <listitem><para>the order of the packing is determined by the
* #ClutterBoxLayout:pack-start boolean property;</para></listitem>
* <listitem><para>each child will be allocated to its natural
* size or, if set to expand, the available size;</para></listitem>
* <listitem><para>if a child is set to fill on either (or both)
* axis, its allocation will match all the available size; the
* fill layout property only makes sense if the expand property is
* also set;</para></listitem>
* <listitem><para>if a child is set to expand but not to fill then
* it is possible to control the alignment using the X and Y alignment
* layout properties.</para></listitem>
* </itemizedlist>
*
* <figure id="box-layout">
* <title>Box layout</title>
* <para>The image shows a #ClutterBoxLayout with the
* #ClutterBoxLayout:vertical property set to %FALSE.</para>
* <graphic fileref="box-layout.png" format="PNG"/>
* </figure>
*
* It is possible to control the spacing between children of a
* #ClutterBoxLayout by using clutter_box_layout_set_spacing().
*
* In order to set the layout properties when packing an actor inside a
* #ClutterBoxLayout you should use the clutter_box_layout_pack()
* function.
*
* #ClutterBoxLayout is available since Clutter 1.2
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include "clutter-box-layout.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
#include "clutter-layout-meta.h"
#include "clutter-private.h"
#include "clutter-types.h"
#define CLUTTER_TYPE_BOX_CHILD (clutter_box_child_get_type ())
#define CLUTTER_BOX_CHILD(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_BOX_CHILD, ClutterBoxChild))
#define CLUTTER_IS_BOX_CHILD(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_BOX_CHILD))
#define CLUTTER_BOX_LAYOUT_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_BOX_LAYOUT, ClutterBoxLayoutPrivate))
typedef struct _ClutterBoxChild ClutterBoxChild;
typedef struct _ClutterLayoutMetaClass ClutterBoxChildClass;
struct _ClutterBoxLayoutPrivate
{
ClutterContainer *container;
guint spacing;
guint is_vertical : 1;
guint is_pack_start : 1;
};
struct _ClutterBoxChild
{
ClutterLayoutMeta parent_instance;
ClutterBoxAlignment x_align;
ClutterBoxAlignment y_align;
guint x_fill : 1;
guint y_fill : 1;
guint expand : 1;
};
enum
{
PROP_CHILD_0,
PROP_CHILD_X_ALIGN,
PROP_CHILD_Y_ALIGN,
PROP_CHILD_X_FILL,
PROP_CHILD_Y_FILL,
PROP_CHILD_EXPAND
};
enum
{
PROP_0,
PROP_SPACING,
PROP_VERTICAL,
PROP_PACK_START
};
G_DEFINE_TYPE (ClutterBoxChild,
clutter_box_child,
CLUTTER_TYPE_LAYOUT_META);
G_DEFINE_TYPE (ClutterBoxLayout,
clutter_box_layout,
CLUTTER_TYPE_LAYOUT_MANAGER);
/*
* ClutterBoxChild
*/
static void
box_child_set_align (ClutterBoxChild *self,
ClutterBoxAlignment x_align,
ClutterBoxAlignment y_align)
{
gboolean x_changed = FALSE, y_changed = FALSE;
if (self->x_align != x_align)
{
self->x_align = x_align;
x_changed = TRUE;
}
if (self->y_align != y_align)
{
self->y_align = y_align;
y_changed = TRUE;
}
if (x_changed || y_changed)
{
ClutterLayoutManager *layout;
layout = clutter_layout_meta_get_manager (CLUTTER_LAYOUT_META (self));
clutter_layout_manager_layout_changed (layout);
if (x_changed)
g_object_notify (G_OBJECT (self), "x-align");
if (y_changed)
g_object_notify (G_OBJECT (self), "y-align");
}
}
static void
box_child_set_fill (ClutterBoxChild *self,
gboolean x_fill,
gboolean y_fill)
{
gboolean x_changed = FALSE, y_changed = FALSE;
if (self->x_fill != x_fill)
{
self->x_fill = x_fill;
x_changed = TRUE;
}
if (self->y_fill != y_fill)
{
self->y_fill = y_fill;
y_changed = TRUE;
}
if (x_changed || y_changed)
{
ClutterLayoutManager *layout;
layout = clutter_layout_meta_get_manager (CLUTTER_LAYOUT_META (self));
clutter_layout_manager_layout_changed (layout);
if (x_changed)
g_object_notify (G_OBJECT (self), "x-fill");
if (y_changed)
g_object_notify (G_OBJECT (self), "y-fill");
}
}
static void
box_child_set_expand (ClutterBoxChild *self,
gboolean expand)
{
if (self->expand != expand)
{
ClutterLayoutManager *layout;
self->expand = expand;
layout = clutter_layout_meta_get_manager (CLUTTER_LAYOUT_META (self));
clutter_layout_manager_layout_changed (layout);
g_object_notify (G_OBJECT (self), "expand");
}
}
static void
clutter_box_child_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBoxChild *self = CLUTTER_BOX_CHILD (gobject);
switch (prop_id)
{
case PROP_CHILD_X_ALIGN:
box_child_set_align (self,
g_value_get_enum (value),
self->y_align);
break;
case PROP_CHILD_Y_ALIGN:
box_child_set_align (self,
self->x_align,
g_value_get_enum (value));
break;
case PROP_CHILD_X_FILL:
box_child_set_fill (self,
g_value_get_boolean (value),
self->y_fill);
break;
case PROP_CHILD_Y_FILL:
box_child_set_fill (self,
self->x_fill,
g_value_get_boolean (value));
break;
case PROP_CHILD_EXPAND:
box_child_set_expand (self, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_box_child_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBoxChild *self = CLUTTER_BOX_CHILD (gobject);
switch (prop_id)
{
case PROP_CHILD_X_ALIGN:
g_value_set_enum (value, self->x_align);
break;
case PROP_CHILD_Y_ALIGN:
g_value_set_enum (value, self->y_align);
break;
case PROP_CHILD_X_FILL:
g_value_set_boolean (value, self->x_fill);
break;
case PROP_CHILD_Y_FILL:
g_value_set_boolean (value, self->y_fill);
break;
case PROP_CHILD_EXPAND:
g_value_set_boolean (value, self->expand);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_box_child_class_init (ClutterBoxChildClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GParamSpec *pspec;
gobject_class->set_property = clutter_box_child_set_property;
gobject_class->get_property = clutter_box_child_get_property;
pspec = g_param_spec_boolean ("expand",
"Expand",
"Allocate extra space for the child",
FALSE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_CHILD_EXPAND, pspec);
pspec = g_param_spec_boolean ("x-fill",
"Horizontal Fill",
"Whether the child should receive priority "
"when the container is allocating spare space "
"on the horizontal axis",
FALSE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_CHILD_X_FILL, pspec);
pspec = g_param_spec_boolean ("y-fill",
"Vertical Fill",
"Whether the child should receive priority "
"when the container is allocating spare space "
"on the vertical axis",
FALSE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_CHILD_Y_FILL, pspec);
pspec = g_param_spec_enum ("x-align",
"Horizontal Alignment",
"Horizontal alignment of the actor within "
"the cell",
CLUTTER_TYPE_BOX_ALIGNMENT,
CLUTTER_BOX_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_CHILD_X_ALIGN, pspec);
pspec = g_param_spec_enum ("y-align",
"Vertical Alignment",
"Vertical alignment of the actor within "
"the cell",
CLUTTER_TYPE_BOX_ALIGNMENT,
CLUTTER_BOX_ALIGNMENT_CENTER,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_CHILD_Y_ALIGN, pspec);
}
static void
clutter_box_child_init (ClutterBoxChild *self)
{
self->x_align = CLUTTER_BOX_ALIGNMENT_CENTER;
self->y_align = CLUTTER_BOX_ALIGNMENT_CENTER;
self->x_fill = self->y_fill = FALSE;
self->expand = FALSE;
}
static inline void
allocate_fill (ClutterActor *child,
ClutterActorBox *childbox,
ClutterBoxChild *box_child)
{
gfloat natural_width, natural_height;
gfloat min_width, min_height;
gfloat child_width, child_height;
gfloat available_width, available_height;
ClutterRequestMode request;
ClutterActorBox allocation = { 0, };
gdouble x_align, y_align;
if (box_child->x_align == CLUTTER_BOX_ALIGNMENT_START)
x_align = 0.0;
else if (box_child->x_align == CLUTTER_BOX_ALIGNMENT_CENTER)
x_align = 0.5;
else
x_align = 1.0;
if (box_child->y_align == CLUTTER_BOX_ALIGNMENT_START)
y_align = 0.0;
else if (box_child->y_align == CLUTTER_BOX_ALIGNMENT_CENTER)
y_align = 0.5;
else
y_align = 1.0;
available_width = childbox->x2 - childbox->x1;
available_height = childbox->y2 - childbox->y1;
if (available_width < 0)
available_width = 0;
if (available_height < 0)
available_height = 0;
if (box_child->x_fill)
{
allocation.x1 = childbox->x1;
allocation.x2 = ceilf (allocation.x1 + available_width);
}
if (box_child->y_fill)
{
allocation.y1 = childbox->y1;
allocation.y2 = ceilf (allocation.y1 + available_height);
}
/* if we are filling horizontally and vertically then we're done */
if (box_child->x_fill && box_child->y_fill)
{
*childbox = allocation;
return;
}
request = clutter_actor_get_request_mode (child);
if (request == CLUTTER_REQUEST_HEIGHT_FOR_WIDTH)
{
clutter_actor_get_preferred_width (child, available_height,
&min_width,
&natural_width);
child_width = CLAMP (natural_width, min_width, available_width);
clutter_actor_get_preferred_height (child, child_width,
&min_height,
&natural_height);
child_height = CLAMP (natural_height, min_height, available_height);
}
else
{
clutter_actor_get_preferred_height (child, available_width,
&min_height,
&natural_height);
child_height = CLAMP (natural_height, min_height, available_height);
clutter_actor_get_preferred_width (child, child_height,
&min_width,
&natural_width);
child_width = CLAMP (natural_width, min_width, available_width);
}
if (!box_child->x_fill)
{
allocation.x1 = ceilf (childbox->x1
+ ((available_width - child_width) * x_align));
allocation.x2 = ceilf (allocation.x1 + child_width);
}
if (!box_child->y_fill)
{
allocation.y1 = ceilf (childbox->y1
+ ((available_height - child_height) * y_align));
allocation.y2 = ceilf (allocation.y1 + child_height);
}
*childbox = allocation;
}
static ClutterLayoutMeta *
clutter_box_layout_create_child_meta (ClutterLayoutManager *layout,
ClutterContainer *container,
ClutterActor *actor)
{
return g_object_new (CLUTTER_TYPE_BOX_CHILD,
"manager", layout,
"container", container,
"actor", actor,
NULL);
}
static void
clutter_box_layout_set_container (ClutterLayoutManager *layout,
ClutterContainer *container)
{
ClutterBoxLayoutPrivate *priv = CLUTTER_BOX_LAYOUT (layout)->priv;
priv->container = container;
if (priv->container != NULL)
{
ClutterRequestMode request_mode;
/* we need to change the :request-mode of the container
* to match the orientation
*/
request_mode = (priv->is_vertical)
? CLUTTER_REQUEST_WIDTH_FOR_HEIGHT
: CLUTTER_REQUEST_HEIGHT_FOR_WIDTH;
clutter_actor_set_request_mode (CLUTTER_ACTOR (priv->container),
request_mode);
}
}
static void
get_preferred_width (ClutterBoxLayout *self,
const GList *children,
gfloat for_height,
gfloat *min_width_p,
gfloat *natural_width_p)
{
ClutterBoxLayoutPrivate *priv = self->priv;
gint n_children = 0;
const GList *l;
if (min_width_p)
*min_width_p = 0;
if (natural_width_p)
*natural_width_p = 0;
for (l = children; l != NULL; l = l->next)
{
ClutterActor *child = l->data;
gfloat child_min = 0, child_nat = 0;
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
n_children++;
clutter_actor_get_preferred_width (child,
(!priv->is_vertical)
? for_height
: -1,
&child_min,
&child_nat);
if (priv->is_vertical)
{
if (min_width_p)
*min_width_p = MAX (child_min, *min_width_p);
if (natural_width_p)
*natural_width_p = MAX (child_nat, *natural_width_p);
}
else
{
if (min_width_p)
*min_width_p += child_min;
if (natural_width_p)
*natural_width_p += child_nat;
}
}
if (!priv->is_vertical && n_children > 1)
{
if (min_width_p)
*min_width_p += priv->spacing * (n_children - 1);
if (natural_width_p)
*natural_width_p += priv->spacing * (n_children - 1);
}
}
static void
get_preferred_height (ClutterBoxLayout *self,
const GList *children,
gfloat for_height,
gfloat *min_height_p,
gfloat *natural_height_p)
{
ClutterBoxLayoutPrivate *priv = self->priv;
gint n_children = 0;
const GList *l;
if (min_height_p)
*min_height_p = 0;
if (natural_height_p)
*natural_height_p = 0;
for (l = children; l != NULL; l = l->next)
{
ClutterActor *child = l->data;
gfloat child_min = 0, child_nat = 0;
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
n_children++;
clutter_actor_get_preferred_height (child,
(priv->is_vertical)
? for_height
: -1,
&child_min,
&child_nat);
if (!priv->is_vertical)
{
if (min_height_p)
*min_height_p = MAX (child_min, *min_height_p);
if (natural_height_p)
*natural_height_p = MAX (child_nat, *natural_height_p);
}
else
{
if (min_height_p)
*min_height_p += child_min;
if (natural_height_p)
*natural_height_p += child_nat;
}
}
if (priv->is_vertical && n_children > 1)
{
if (min_height_p)
*min_height_p += priv->spacing * (n_children - 1);
if (natural_height_p)
*natural_height_p += priv->spacing * (n_children - 1);
}
}
static void
clutter_box_layout_get_preferred_width (ClutterLayoutManager *layout,
ClutterContainer *container,
gfloat for_height,
gfloat *min_width_p,
gfloat *natural_width_p)
{
ClutterBoxLayout *self = CLUTTER_BOX_LAYOUT (layout);
GList *children;
children = clutter_container_get_children (container);
get_preferred_width (self, children, for_height,
min_width_p,
natural_width_p);
g_list_free (children);
}
static void
clutter_box_layout_get_preferred_height (ClutterLayoutManager *layout,
ClutterContainer *container,
gfloat for_width,
gfloat *min_height_p,
gfloat *natural_height_p)
{
ClutterBoxLayout *self = CLUTTER_BOX_LAYOUT (layout);
GList *children;
children = clutter_container_get_children (container);
get_preferred_height (self, children, for_width,
min_height_p,
natural_height_p);
g_list_free (children);
}
static void
clutter_box_layout_allocate (ClutterLayoutManager *layout,
ClutterContainer *container,
const ClutterActorBox *box,
ClutterAllocationFlags flags)
{
ClutterBoxLayoutPrivate *priv = CLUTTER_BOX_LAYOUT (layout)->priv;
gfloat avail_width, avail_height, pref_width, pref_height;
GList *children, *l;
gint n_expand_children, extra_space;
gfloat position;
children = clutter_container_get_children (container);
if (children == NULL)
return;
clutter_actor_box_get_size (box, &avail_width, &avail_height);
if (priv->is_vertical)
{
get_preferred_height (CLUTTER_BOX_LAYOUT (layout),
children, avail_width,
NULL,
&pref_height);
pref_width = avail_width;
}
else
{
get_preferred_width (CLUTTER_BOX_LAYOUT (layout),
children, avail_height,
NULL,
&pref_width);
pref_height = avail_height;
}
/* count the number of children with expand set to TRUE */
n_expand_children = 0;
for (l = children; l; l = l->next)
{
ClutterLayoutMeta *meta;
meta = clutter_layout_manager_get_child_meta (layout,
container,
l->data);
if (CLUTTER_BOX_CHILD (meta)->expand)
n_expand_children++;
}
if (n_expand_children == 0)
{
extra_space = 0;
n_expand_children = 1;
}
else
{
if (priv->is_vertical)
extra_space = (avail_height - pref_height) / n_expand_children;
else
extra_space = (avail_width - pref_width) / n_expand_children;
/* don't shrink anything */
if (extra_space < 0)
extra_space = 0;
}
position = 0;
for (l = (priv->is_pack_start) ? g_list_last (children) : children;
l != NULL;
l = (priv->is_pack_start) ? l->prev : l->next)
{
ClutterActor *child = l->data;
ClutterActorBox child_box;
ClutterBoxChild *box_child;
ClutterLayoutMeta *meta;
gfloat child_nat;
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
meta = clutter_layout_manager_get_child_meta (layout,
container,
child);
box_child = CLUTTER_BOX_CHILD (meta);
if (priv->is_vertical)
{
clutter_actor_get_preferred_height (child, avail_width,
NULL, &child_nat);
child_box.y1 = ceilf (position);
if (box_child->expand)
child_box.y2 = ceilf (position + child_nat + extra_space);
else
child_box.y2 = ceilf (position + child_nat);
child_box.x1 = 0;
child_box.x2 = ceilf (avail_width);
allocate_fill (child, &child_box, box_child);
clutter_actor_allocate (child, &child_box, flags);
if (box_child->expand)
position += (child_nat + priv->spacing + extra_space);
else
position += (child_nat + priv->spacing);
}
else
{
clutter_actor_get_preferred_width (child, avail_height,
NULL, &child_nat);
child_box.x1 = ceilf (position);
if (box_child->expand)
child_box.x2 = ceilf (position + child_nat + extra_space);
else
child_box.x2 = ceilf (position + child_nat);
child_box.y1 = 0;
child_box.y2 = ceilf (avail_height);
allocate_fill (child, &child_box, box_child);
clutter_actor_allocate (child, &child_box, flags);
if (box_child->expand)
position += (child_nat + priv->spacing + extra_space);
else
position += (child_nat + priv->spacing);
}
}
g_list_free (children);
}
static void
clutter_box_layout_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterBoxLayout *self = CLUTTER_BOX_LAYOUT (gobject);
switch (prop_id)
{
case PROP_VERTICAL:
clutter_box_layout_set_vertical (self, g_value_get_boolean (value));
break;
case PROP_SPACING:
clutter_box_layout_set_spacing (self, g_value_get_uint (value));
break;
case PROP_PACK_START:
clutter_box_layout_set_pack_start (self, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_box_layout_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterBoxLayoutPrivate *priv = CLUTTER_BOX_LAYOUT (gobject)->priv;
switch (prop_id)
{
case PROP_VERTICAL:
g_value_set_boolean (value, priv->is_vertical);
break;
case PROP_SPACING:
g_value_set_uint (value, priv->spacing);
break;
case PROP_PACK_START:
g_value_set_boolean (value, priv->is_pack_start);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_box_layout_class_init (ClutterBoxLayoutClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterLayoutManagerClass *layout_class;
GParamSpec *pspec;
layout_class = CLUTTER_LAYOUT_MANAGER_CLASS (klass);
gobject_class->set_property = clutter_box_layout_set_property;
gobject_class->get_property = clutter_box_layout_get_property;
layout_class->get_preferred_width =
clutter_box_layout_get_preferred_width;
layout_class->get_preferred_height =
clutter_box_layout_get_preferred_height;
layout_class->allocate = clutter_box_layout_allocate;
layout_class->set_container = clutter_box_layout_set_container;
layout_class->create_child_meta = clutter_box_layout_create_child_meta;
g_type_class_add_private (klass, sizeof (ClutterBoxLayoutPrivate));
/**
* ClutterBoxLayout:vertical:
*
* Whether the #ClutterBoxLayout should arrange its children
* alongside the Y axis, instead of alongside the X axis
*
* Since: 1.2
*/
pspec = g_param_spec_boolean ("vertical",
"Vertical",
"Whether the layout should be vertical, rather"
"than horizontal",
FALSE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_VERTICAL, pspec);
/**
* ClutterBoxLayout:pack-start:
*
* Whether the #ClutterBoxLayout should pack items at the start
* or append them at the end
*
* Since: 1.2
*/
pspec = g_param_spec_boolean ("pack-start",
"Pack Start",
"Whether to pack items at the start of the box",
FALSE,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_PACK_START, pspec);
/**
* ClutterBoxLayout:spacing:
*
* The spacing between children of the #ClutterBoxLayout, in pixels
*
* Since: 1.2
*/
pspec = g_param_spec_uint ("spacing",
"Spacing",
"Spacing between children",
0, G_MAXUINT, 0,
CLUTTER_PARAM_READWRITE);
g_object_class_install_property (gobject_class, PROP_SPACING, pspec);
}
static void
clutter_box_layout_init (ClutterBoxLayout *layout)
{
ClutterBoxLayoutPrivate *priv;
layout->priv = priv = CLUTTER_BOX_LAYOUT_GET_PRIVATE (layout);
priv->is_vertical = FALSE;
priv->is_pack_start = FALSE;
priv->spacing = 0;
}
/**
* clutter_box_layout_new:
*
* Creates a new #ClutterBoxLayout layout manager
*
* Return value: the newly created #ClutterBoxLayout
*
* Since: 1.2
*/
ClutterLayoutManager *
clutter_box_layout_new (void)
{
return g_object_new (CLUTTER_TYPE_BOX_LAYOUT, NULL);
}
/**
* clutter_box_layout_set_spacing:
* @layout: a #ClutterBoxLayout
* @spacing: the spacing between children of the layout, in pixels
*
* Sets the spacing between children of @layout
*
* Since: 1.2
*/
void
clutter_box_layout_set_spacing (ClutterBoxLayout *layout,
guint spacing)
{
ClutterBoxLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
priv = layout->priv;
if (priv->spacing != spacing)
{
ClutterLayoutManager *manager;
priv->spacing = spacing;
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify (G_OBJECT (layout), "spacing");
}
}
/**
* clutter_box_layout_get_spacing:
* @layout: a #ClutterBoxLayout
*
* Retrieves the spacing set using clutter_box_layout_set_spacing()
*
* Return value: the spacing between children of the #ClutterBoxLayout
*
* Since: 1.2
*/
guint
clutter_box_layout_get_spacing (ClutterBoxLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_BOX_LAYOUT (layout), 0);
return layout->priv->spacing;
}
/**
* clutter_box_layout_set_vertical:
* @layout: a #ClutterBoxLayout
* @vertical: %TRUE if the layout should be vertical
*
* Sets whether @layout should arrange its children vertically alongside
* the Y axis, instead of horizontally alongside the X axis
*
* Since: 1.2
*/
void
clutter_box_layout_set_vertical (ClutterBoxLayout *layout,
gboolean vertical)
{
ClutterBoxLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
priv = layout->priv;
if (priv->is_vertical != vertical)
{
ClutterLayoutManager *manager;
priv->is_vertical = vertical ? TRUE : FALSE;
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify (G_OBJECT (layout), "vertical");
}
}
/**
* clutter_box_layout_get_vertical:
* @layout: a #ClutterBoxLayout
*
* Retrieves the orientation of the @layout as set using the
* clutter_box_layout_set_vertical() function
*
* Return value: %TRUE if the #ClutterBoxLayout is arranging its children
* vertically, and %FALSE otherwise
*
* Since: 1.2
*/
gboolean
clutter_box_layout_get_vertical (ClutterBoxLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_BOX_LAYOUT (layout), FALSE);
return layout->priv->is_vertical;
}
/**
* clutter_box_layout_set_pack_start:
* @layout: a #ClutterBoxLayout
* @pack_start: %TRUE if the @layout should pack children at the
* beginning of the layout
*
* Sets whether children of @layout should be layed out by appending
* them or by prepending them
*
* Since: 1.2
*/
void
clutter_box_layout_set_pack_start (ClutterBoxLayout *layout,
gboolean pack_start)
{
ClutterBoxLayoutPrivate *priv;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
priv = layout->priv;
if (priv->is_pack_start != pack_start)
{
ClutterLayoutManager *manager;
priv->is_pack_start = pack_start ? TRUE : FALSE;
manager = CLUTTER_LAYOUT_MANAGER (layout);
clutter_layout_manager_layout_changed (manager);
g_object_notify (G_OBJECT (layout), "pack-start");
}
}
/**
* clutter_box_layout_get_pack_start:
* @layout: a #ClutterBoxLayout
*
* Retrieves the value set using clutter_box_layout_set_pack_start()
*
* Return value: %TRUE if the #ClutterBoxLayout should pack children
* at the beginning of the layout, and %FALSE otherwise
*
* Since: 1.2
*/
gboolean
clutter_box_layout_get_pack_start (ClutterBoxLayout *layout)
{
g_return_val_if_fail (CLUTTER_IS_BOX_LAYOUT (layout), FALSE);
return layout->priv->is_pack_start;
}
/**
* clutter_box_layout_pack:
* @layout: a #ClutterBoxLayout
* @actor: a #ClutterActor
* @expand: whether the @actor should expand
* @x_fill: whether the @actor should fill horizontally
* @y_fill: whether the @actor should fill vertically
* @x_align: the horizontal alignment policy for @actor
* @y_align: the vertical alignment policy for @actor
*
* Packs @actor inside the #ClutterContainer associated to @layout
* and sets the layout properties
*
* Since: 1.2
*/
void
clutter_box_layout_pack (ClutterBoxLayout *layout,
ClutterActor *actor,
gboolean expand,
gboolean x_fill,
gboolean y_fill,
ClutterBoxAlignment x_align,
ClutterBoxAlignment y_align)
{
ClutterBoxLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
priv = layout->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 (layout));
return;
}
clutter_container_add_actor (priv->container, actor);
manager = CLUTTER_LAYOUT_MANAGER (layout);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
actor);
g_assert (CLUTTER_IS_BOX_CHILD (meta));
box_child_set_align (CLUTTER_BOX_CHILD (meta), x_align, y_align);
box_child_set_fill (CLUTTER_BOX_CHILD (meta), x_fill, y_fill);
box_child_set_expand (CLUTTER_BOX_CHILD (meta), expand);
}
/**
* clutter_box_layout_set_alignment:
* @layout: a #ClutterBoxLayout
* @actor: a #ClutterActor child of @layout
* @x_align: Horizontal alignment policy for @actor
* @y_align: Vertical alignment policy for @actor
*
* Sets the horizontal and vertical alignment policies for @actor
* inside @layout
*
* Since: 1.2
*/
void
clutter_box_layout_set_alignment (ClutterBoxLayout *layout,
ClutterActor *actor,
ClutterBoxAlignment x_align,
ClutterBoxAlignment y_align)
{
ClutterBoxLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
priv = layout->priv;
if (priv->container == NULL)
{
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before querying layout "
"properties",
G_OBJECT_TYPE_NAME (layout));
return;
}
manager = CLUTTER_LAYOUT_MANAGER (layout);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
actor);
if (meta == NULL)
{
g_warning ("No layout meta found for the child of type '%s' "
"inside the layout manager of type '%s'",
G_OBJECT_TYPE_NAME (actor),
G_OBJECT_TYPE_NAME (manager));
return;
}
g_assert (CLUTTER_IS_BOX_CHILD (meta));
box_child_set_align (CLUTTER_BOX_CHILD (meta), x_align, y_align);
}
/**
* clutter_box_layout_get_alignment:
* @layout: a #ClutterBoxLayout
* @actor: a #ClutterActor child of @layout
* @x_align: (out): return location for the horizontal alignment policy
* @y_align: (out): return location for the vertical alignment policy
*
* Retrieves the horizontal and vertical alignment policies for @actor
* as set using clutter_box_layout_pack() or clutter_box_layout_set_alignment()
*
* Since: 1.2
*/
void
clutter_box_layout_get_alignment (ClutterBoxLayout *layout,
ClutterActor *actor,
ClutterBoxAlignment *x_align,
ClutterBoxAlignment *y_align)
{
ClutterBoxLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
priv = layout->priv;
if (priv->container == NULL)
{
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before querying layout "
"properties",
G_OBJECT_TYPE_NAME (layout));
return;
}
manager = CLUTTER_LAYOUT_MANAGER (layout);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
actor);
if (meta == NULL)
{
g_warning ("No layout meta found for the child of type '%s' "
"inside the layout manager of type '%s'",
G_OBJECT_TYPE_NAME (actor),
G_OBJECT_TYPE_NAME (manager));
return;
}
g_assert (CLUTTER_IS_BOX_CHILD (meta));
if (x_align)
*x_align = CLUTTER_BOX_CHILD (meta)->x_align;
if (y_align)
*y_align = CLUTTER_BOX_CHILD (meta)->y_align;
}
/**
* clutter_box_layout_set_fill:
* @layout: a #ClutterBoxLayout
* @actor: a #ClutterActor child of @layout
* @x_fill: whether @actor should fill horizontally the allocated space
* @y_fill: whether @actor should fill vertically the allocated space
*
* Sets the horizontal and vertical fill policies for @actor
* inside @layout
*
* Since: 1.2
*/
void
clutter_box_layout_set_fill (ClutterBoxLayout *layout,
ClutterActor *actor,
gboolean x_fill,
gboolean y_fill)
{
ClutterBoxLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
priv = layout->priv;
if (priv->container == NULL)
{
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before querying layout "
"properties",
G_OBJECT_TYPE_NAME (layout));
return;
}
manager = CLUTTER_LAYOUT_MANAGER (layout);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
actor);
if (meta == NULL)
{
g_warning ("No layout meta found for the child of type '%s' "
"inside the layout manager of type '%s'",
G_OBJECT_TYPE_NAME (actor),
G_OBJECT_TYPE_NAME (manager));
return;
}
g_assert (CLUTTER_IS_BOX_CHILD (meta));
box_child_set_fill (CLUTTER_BOX_CHILD (meta), x_fill, y_fill);
}
/**
* clutter_box_layout_get_fill:
* @layout: a #ClutterBoxLayout
* @actor: a #ClutterActor child of @layout
* @x_fill: (out): return location for the horizontal fill policy
* @y_fill: (out): return location for the vertical fill policy
*
* Retrieves the horizontal and vertical fill policies for @actor
* as set using clutter_box_layout_pack() or clutter_box_layout_set_fill()
*
* Since: 1.2
*/
void
clutter_box_layout_get_fill (ClutterBoxLayout *layout,
ClutterActor *actor,
gboolean *x_fill,
gboolean *y_fill)
{
ClutterBoxLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
priv = layout->priv;
if (priv->container == NULL)
{
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before querying layout "
"properties",
G_OBJECT_TYPE_NAME (layout));
return;
}
manager = CLUTTER_LAYOUT_MANAGER (layout);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
actor);
if (meta == NULL)
{
g_warning ("No layout meta found for the child of type '%s' "
"inside the layout manager of type '%s'",
G_OBJECT_TYPE_NAME (actor),
G_OBJECT_TYPE_NAME (manager));
return;
}
g_assert (CLUTTER_IS_BOX_CHILD (meta));
if (x_fill)
*x_fill = CLUTTER_BOX_CHILD (meta)->x_fill;
if (y_fill)
*y_fill = CLUTTER_BOX_CHILD (meta)->y_fill;
}
/**
* clutter_box_layout_set_expand:
* @layout: a #ClutterBoxLayout
* @actor: a #ClutterActor child of @layout
* @expand: whether @actor should expand
*
* Sets whether @actor should expand inside @layout
*
* Since: 1.2
*/
void
clutter_box_layout_set_expand (ClutterBoxLayout *layout,
ClutterActor *actor,
gboolean expand)
{
ClutterBoxLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_if_fail (CLUTTER_IS_BOX_LAYOUT (layout));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
priv = layout->priv;
if (priv->container == NULL)
{
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before querying layout "
"properties",
G_OBJECT_TYPE_NAME (layout));
return;
}
manager = CLUTTER_LAYOUT_MANAGER (layout);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
actor);
if (meta == NULL)
{
g_warning ("No layout meta found for the child of type '%s' "
"inside the layout manager of type '%s'",
G_OBJECT_TYPE_NAME (actor),
G_OBJECT_TYPE_NAME (manager));
return;
}
g_assert (CLUTTER_IS_BOX_CHILD (meta));
box_child_set_expand (CLUTTER_BOX_CHILD (meta), expand);
}
/**
* clutter_box_layout_get_expand:
* @layout: a #ClutterBoxLayout
* @actor: a #ClutterActor child of @layout
*
* Retrieves whether @actor should expand inside @layout
*
* Return value: %TRUE if the #ClutterActor should expand, %FALSE otherwise
*
* Since: 1.2
*/
gboolean
clutter_box_layout_get_expand (ClutterBoxLayout *layout,
ClutterActor *actor)
{
ClutterBoxLayoutPrivate *priv;
ClutterLayoutManager *manager;
ClutterLayoutMeta *meta;
g_return_val_if_fail (CLUTTER_IS_BOX_LAYOUT (layout), FALSE);
g_return_val_if_fail (CLUTTER_IS_ACTOR (actor), FALSE);
priv = layout->priv;
if (priv->container == NULL)
{
g_warning ("The layout of type '%s' must be associated to "
"a ClutterContainer before querying layout "
"properties",
G_OBJECT_TYPE_NAME (layout));
return FALSE;
}
manager = CLUTTER_LAYOUT_MANAGER (layout);
meta = clutter_layout_manager_get_child_meta (manager,
priv->container,
actor);
if (meta == NULL)
{
g_warning ("No layout meta found for the child of type '%s' "
"inside the layout manager of type '%s'",
G_OBJECT_TYPE_NAME (actor),
G_OBJECT_TYPE_NAME (manager));
return FALSE;
}
g_assert (CLUTTER_IS_BOX_CHILD (meta));
return CLUTTER_BOX_CHILD (meta)->expand;
}
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