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gtk3/gtk/gtkbox.c

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
/**
* SECTION:gtkbox
* @Short_description: A container box
* @Title: GtkBox
* @See_also: #GtkFrame, #GtkGrid, #GtkLayout
*
* The GtkBox widget organizes child widgets into a rectangular area.
*
* The rectangular area of a GtkBox is organized into either a single row
* or a single column of child widgets depending upon the orientation.
* Thus, all children of a GtkBox are allocated one dimension in common,
* which is the height of a row, or the width of a column.
*
* GtkBox uses a notion of <emphasis>packing</emphasis>. Packing refers
* to adding widgets with reference to a particular position in a
* #GtkContainer. For a GtkBox, there are two reference positions: the
* <emphasis>start</emphasis> and the <emphasis>end</emphasis> of the box.
* For a vertical #GtkBox, the start is defined as the top of the box and
* the end is defined as the bottom. For a horizontal #GtkBox the start
* is defined as the left side and the end is defined as the right side.
*
* Use repeated calls to gtk_box_pack_start() to pack widgets into a
* GtkBox from start to end. Use gtk_box_pack_end() to add widgets from
* end to start. You may intersperse these calls and add widgets from
* both ends of the same GtkBox.
*
* Because GtkBox is a #GtkContainer, you may also use gtk_container_add()
* to insert widgets into the box, and they will be packed with the default
* values for #GtkBox:expand and #GtkBox:fill. Use gtk_container_remove()
* to remove widgets from the GtkBox.
*
* Use gtk_box_set_homogeneous() to specify whether or not all children
* of the GtkBox are forced to get the same amount of space.
*
* Use gtk_box_set_spacing() to determine how much space will be
* minimally placed between all children in the GtkBox. Note that
* spacing is added <emphasis>between</emphasis> the children, while
* padding added by gtk_box_pack_start() or gtk_box_pack_end() is added
* <emphasis>on either side</emphasis> of the widget it belongs to.
*
* Use gtk_box_reorder_child() to move a GtkBox child to a different
* place in the box.
*
* Use gtk_box_set_child_packing() to reset the #GtkBox:expand,
* #GtkBox:fill and #GtkBox:padding child properties.
* Use gtk_box_query_child_packing() to query these fields.
*
* <note><para>
* Note that a single-row or single-column #GtkGrid provides exactly
* the same functionality as #GtkBox.
* </para></note>
*/
#include "config.h"
#include "gtkbox.h"
#include "gtkboxprivate.h"
#include "gtkintl.h"
#include "gtkorientable.h"
#include "gtkorientableprivate.h"
#include "gtkprivate.h"
#include "gtktypebuiltins.h"
#include "gtksizerequest.h"
#include "gtkwidgetpath.h"
#include "gtkwidgetprivate.h"
#include "a11y/gtkcontaineraccessible.h"
enum {
PROP_0,
PROP_ORIENTATION,
PROP_SPACING,
PROP_HOMOGENEOUS
};
enum {
CHILD_PROP_0,
CHILD_PROP_EXPAND,
CHILD_PROP_FILL,
CHILD_PROP_PADDING,
CHILD_PROP_PACK_TYPE,
CHILD_PROP_POSITION
};
struct _GtkBoxPrivate
{
GList *children;
GtkOrientation orientation;
gint16 spacing;
guint default_expand : 1;
guint homogeneous : 1;
guint spacing_set : 1;
};
typedef struct _GtkBoxChild GtkBoxChild;
/*
* GtkBoxChild:
* @widget: the child widget, packed into the GtkBox.
* @padding: the number of extra pixels to put between this child and its
* neighbors, set when packed, zero by default.
* @expand: flag indicates whether extra space should be given to this child.
* Any extra space given to the parent GtkBox is divided up among all children
* with this attribute set to %TRUE; set when packed, %TRUE by default.
* @fill: flag indicates whether any extra space given to this child due to its
* @expand attribute being set is actually allocated to the child, rather than
* being used as padding around the widget; set when packed, %TRUE by default.
* @pack: one of #GtkPackType indicating whether the child is packed with
* reference to the start (top/left) or end (bottom/right) of the GtkBox.
*/
struct _GtkBoxChild
{
GtkWidget *widget;
guint16 padding;
guint expand : 1;
guint fill : 1;
guint pack : 1;
};
static void gtk_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_box_compute_expand (GtkWidget *widget,
gboolean *hexpand,
gboolean *vexpand);
static void gtk_box_direction_changed (GtkWidget *widget,
GtkTextDirection previous_direction);
static void gtk_box_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_box_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_box_add (GtkContainer *container,
GtkWidget *widget);
static void gtk_box_remove (GtkContainer *container,
GtkWidget *widget);
static void gtk_box_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
static void gtk_box_set_child_property (GtkContainer *container,
GtkWidget *child,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_box_get_child_property (GtkContainer *container,
GtkWidget *child,
guint property_id,
GValue *value,
GParamSpec *pspec);
static GType gtk_box_child_type (GtkContainer *container);
static GtkWidgetPath * gtk_box_get_path_for_child
(GtkContainer *container,
GtkWidget *child);
static void gtk_box_get_preferred_width (GtkWidget *widget,
gint *minimum_size,
gint *natural_size);
static void gtk_box_get_preferred_height (GtkWidget *widget,
gint *minimum_size,
gint *natural_size);
static void gtk_box_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum_width,
gint *natural_width);
static void gtk_box_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height);
G_DEFINE_TYPE_WITH_CODE (GtkBox, gtk_box, GTK_TYPE_CONTAINER,
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE,
NULL))
static void
gtk_box_class_init (GtkBoxClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
GtkContainerClass *container_class = GTK_CONTAINER_CLASS (class);
object_class->set_property = gtk_box_set_property;
object_class->get_property = gtk_box_get_property;
widget_class->size_allocate = gtk_box_size_allocate;
widget_class->get_preferred_width = gtk_box_get_preferred_width;
widget_class->get_preferred_height = gtk_box_get_preferred_height;
widget_class->get_preferred_height_for_width = gtk_box_get_preferred_height_for_width;
widget_class->get_preferred_width_for_height = gtk_box_get_preferred_width_for_height;
widget_class->compute_expand = gtk_box_compute_expand;
widget_class->direction_changed = gtk_box_direction_changed;
container_class->add = gtk_box_add;
container_class->remove = gtk_box_remove;
container_class->forall = gtk_box_forall;
container_class->child_type = gtk_box_child_type;
container_class->set_child_property = gtk_box_set_child_property;
container_class->get_child_property = gtk_box_get_child_property;
container_class->get_path_for_child = gtk_box_get_path_for_child;
gtk_container_class_handle_border_width (container_class);
g_object_class_override_property (object_class,
PROP_ORIENTATION,
"orientation");
g_object_class_install_property (object_class,
PROP_SPACING,
g_param_spec_int ("spacing",
P_("Spacing"),
P_("The amount of space between children"),
0,
G_MAXINT,
0,
GTK_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_HOMOGENEOUS,
g_param_spec_boolean ("homogeneous",
P_("Homogeneous"),
P_("Whether the children should all be the same size"),
FALSE,
GTK_PARAM_READWRITE));
/**
* GtkBox:expand:
*
* Whether the child should receive extra space when the parent grows.
*
* Note that the default value for this property is %FALSE for GtkBox,
* but #GtkHBox, #GtkVBox and other subclasses use the old default
* of %TRUE.
*
* Note that the #GtkWidget:halign, #GtkWidget:valign, #GtkWidget:hexpand
* and #GtkWidget:vexpand properties are the preferred way to influence
* child size allocation in containers.
*/
gtk_container_class_install_child_property (container_class,
CHILD_PROP_EXPAND,
g_param_spec_boolean ("expand",
P_("Expand"),
P_("Whether the child should receive extra space when the parent grows"),
FALSE,
GTK_PARAM_READWRITE));
/**
* GtkBox:fill:
*
* Whether the child should receive extra space when the parent grows.
*
* Note that the #GtkWidget:halign, #GtkWidget:valign, #GtkWidget:hexpand
* and #GtkWidget:vexpand properties are the preferred way to influence
* child size allocation in containers.
*/
gtk_container_class_install_child_property (container_class,
CHILD_PROP_FILL,
g_param_spec_boolean ("fill",
P_("Fill"),
P_("Whether extra space given to the child should be allocated to the child or used as padding"),
TRUE,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class,
CHILD_PROP_PADDING,
g_param_spec_uint ("padding",
P_("Padding"),
P_("Extra space to put between the child and its neighbors, in pixels"),
0, G_MAXINT, 0,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class,
CHILD_PROP_PACK_TYPE,
g_param_spec_enum ("pack-type",
P_("Pack type"),
P_("A GtkPackType indicating whether the child is packed with reference to the start or end of the parent"),
GTK_TYPE_PACK_TYPE, GTK_PACK_START,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class,
CHILD_PROP_POSITION,
g_param_spec_int ("position",
P_("Position"),
P_("The index of the child in the parent"),
-1, G_MAXINT, 0,
GTK_PARAM_READWRITE));
g_type_class_add_private (object_class, sizeof (GtkBoxPrivate));
gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_FILLER);
}
static void
gtk_box_init (GtkBox *box)
{
GtkBoxPrivate *private;
box->priv = G_TYPE_INSTANCE_GET_PRIVATE (box,
GTK_TYPE_BOX,
GtkBoxPrivate);
private = box->priv;
gtk_widget_set_has_window (GTK_WIDGET (box), FALSE);
gtk_widget_set_redraw_on_allocate (GTK_WIDGET (box), FALSE);
private->orientation = GTK_ORIENTATION_HORIZONTAL;
private->children = NULL;
private->default_expand = FALSE;
private->homogeneous = FALSE;
private->spacing = 0;
private->spacing_set = FALSE;
}
static void
gtk_box_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkBox *box = GTK_BOX (object);
GtkBoxPrivate *private = box->priv;
switch (prop_id)
{
case PROP_ORIENTATION:
private->orientation = g_value_get_enum (value);
_gtk_orientable_set_style_classes (GTK_ORIENTABLE (box));
gtk_widget_queue_resize (GTK_WIDGET (box));
break;
case PROP_SPACING:
gtk_box_set_spacing (box, g_value_get_int (value));
break;
case PROP_HOMOGENEOUS:
gtk_box_set_homogeneous (box, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_box_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkBox *box = GTK_BOX (object);
GtkBoxPrivate *private = box->priv;
switch (prop_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, private->orientation);
break;
case PROP_SPACING:
g_value_set_int (value, private->spacing);
break;
case PROP_HOMOGENEOUS:
g_value_set_boolean (value, private->homogeneous);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
count_expand_children (GtkBox *box,
gint *visible_children,
gint *expand_children)
{
GtkBoxPrivate *private = box->priv;
GList *children;
GtkBoxChild *child;
*visible_children = *expand_children = 0;
for (children = private->children; children; children = children->next)
{
child = children->data;
if (gtk_widget_get_visible (child->widget))
{
*visible_children += 1;
if (child->expand || gtk_widget_compute_expand (child->widget, private->orientation))
*expand_children += 1;
}
}
}
static void
gtk_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkBox *box = GTK_BOX (widget);
GtkBoxPrivate *private = box->priv;
GtkBoxChild *child;
GList *children;
gint nvis_children;
gint nexpand_children;
GtkTextDirection direction;
GtkAllocation child_allocation;
GtkRequestedSize *sizes;
GtkPackType packing;
gint size;
gint extra;
gint n_extra_widgets = 0; /* Number of widgets that receive 1 extra px */
gint x = 0, y = 0, i;
gint child_size;
gtk_widget_set_allocation (widget, allocation);
count_expand_children (box, &nvis_children, &nexpand_children);
/* If there is no visible child, simply return. */
if (nvis_children <= 0)
return;
direction = gtk_widget_get_direction (widget);
sizes = g_newa (GtkRequestedSize, nvis_children);
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
size = allocation->width - (nvis_children - 1) * private->spacing;
else
size = allocation->height - (nvis_children - 1) * private->spacing;
/* Retrieve desired size for visible children. */
for (i = 0, children = private->children; children; children = children->next)
{
child = children->data;
if (!gtk_widget_get_visible (child->widget))
continue;
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_width_for_height (child->widget,
allocation->height,
&sizes[i].minimum_size,
&sizes[i].natural_size);
else
gtk_widget_get_preferred_height_for_width (child->widget,
allocation->width,
&sizes[i].minimum_size,
&sizes[i].natural_size);
/* Assert the api is working properly */
if (sizes[i].minimum_size < 0)
g_error ("GtkBox child %s minimum %s: %d < 0 for %s %d",
gtk_widget_get_name (GTK_WIDGET (child->widget)),
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? "width" : "height",
sizes[i].minimum_size,
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? "height" : "width",
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? allocation->height : allocation->width);
if (sizes[i].natural_size < sizes[i].minimum_size)
g_error ("GtkBox child %s natural %s: %d < minimum %d for %s %d",
gtk_widget_get_name (GTK_WIDGET (child->widget)),
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? "width" : "height",
sizes[i].natural_size,
sizes[i].minimum_size,
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? "height" : "width",
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? allocation->height : allocation->width);
size -= sizes[i].minimum_size;
size -= child->padding * 2;
sizes[i].data = child;
i++;
}
if (private->homogeneous)
{
/* If were homogenous we still need to run the above loop to get the
* minimum sizes for children that are not going to fill
*/
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
size = allocation->width - (nvis_children - 1) * private->spacing;
else
size = allocation->height - (nvis_children - 1) * private->spacing;
extra = size / nvis_children;
n_extra_widgets = size % nvis_children;
}
else
{
/* Bring children up to size first */
size = gtk_distribute_natural_allocation (MAX (0, size), nvis_children, sizes);
/* Calculate space which hasn't distributed yet,
* and is available for expanding children.
*/
if (nexpand_children > 0)
{
extra = size / nexpand_children;
n_extra_widgets = size % nexpand_children;
}
else
extra = 0;
}
/* Allocate child positions. */
for (packing = GTK_PACK_START; packing <= GTK_PACK_END; ++packing)
{
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
{
child_allocation.y = allocation->y;
child_allocation.height = MAX (1, allocation->height);
if (packing == GTK_PACK_START)
x = allocation->x;
else
x = allocation->x + allocation->width;
}
else
{
child_allocation.x = allocation->x;
child_allocation.width = MAX (1, allocation->width);
if (packing == GTK_PACK_START)
y = allocation->y;
else
y = allocation->y + allocation->height;
}
for (i = 0, children = private->children;
children;
children = children->next)
{
child = children->data;
/* If widget is not visible, skip it. */
if (!gtk_widget_get_visible (child->widget))
continue;
/* If widget is packed differently skip it, but still increment i,
* since widget is visible and will be handled in next loop iteration.
*/
if (child->pack != packing)
{
i++;
continue;
}
/* Assign the child's size. */
if (private->homogeneous)
{
child_size = extra;
if (n_extra_widgets > 0)
{
child_size++;
n_extra_widgets--;
}
}
else
{
child_size = sizes[i].minimum_size + child->padding * 2;
if (child->expand || gtk_widget_compute_expand (child->widget, private->orientation))
{
child_size += extra;
if (n_extra_widgets > 0)
{
child_size++;
n_extra_widgets--;
}
}
}
/* Assign the child's position. */
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
{
if (child->fill)
{
child_allocation.width = MAX (1, child_size - child->padding * 2);
child_allocation.x = x + child->padding;
}
else
{
child_allocation.width = sizes[i].minimum_size;
child_allocation.x = x + (child_size - child_allocation.width) / 2;
}
if (packing == GTK_PACK_START)
{
x += child_size + private->spacing;
}
else
{
x -= child_size + private->spacing;
child_allocation.x -= child_size;
}
if (direction == GTK_TEXT_DIR_RTL)
child_allocation.x = allocation->x + allocation->width - (child_allocation.x - allocation->x) - child_allocation.width;
}
else /* (private->orientation == GTK_ORIENTATION_VERTICAL) */
{
if (child->fill)
{
child_allocation.height = MAX (1, child_size - child->padding * 2);
child_allocation.y = y + child->padding;
}
else
{
child_allocation.height = sizes[i].minimum_size;
child_allocation.y = y + (child_size - child_allocation.height) / 2;
}
if (packing == GTK_PACK_START)
{
y += child_size + private->spacing;
}
else
{
y -= child_size + private->spacing;
child_allocation.y -= child_size;
}
}
gtk_widget_size_allocate (child->widget, &child_allocation);
i++;
}
}
}
static void
gtk_box_compute_expand (GtkWidget *widget,
gboolean *hexpand_p,
gboolean *vexpand_p)
{
GtkBoxPrivate *private = GTK_BOX (widget)->priv;
GList *children;
GtkBoxChild *child;
gboolean our_expand;
gboolean opposite_expand;
GtkOrientation opposite_orientation;
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
opposite_orientation = GTK_ORIENTATION_VERTICAL;
else
opposite_orientation = GTK_ORIENTATION_HORIZONTAL;
our_expand = FALSE;
opposite_expand = FALSE;
for (children = private->children; children; children = children->next)
{
child = children->data;
/* we don't recurse into children anymore as soon as we know
* expand=TRUE in an orientation
*/
if (child->expand || (!our_expand && gtk_widget_compute_expand (child->widget, private->orientation)))
our_expand = TRUE;
if (!opposite_expand && gtk_widget_compute_expand (child->widget, opposite_orientation))
opposite_expand = TRUE;
if (our_expand && opposite_expand)
break;
}
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
{
*hexpand_p = our_expand;
*vexpand_p = opposite_expand;
}
else
{
*hexpand_p = opposite_expand;
*vexpand_p = our_expand;
}
}
static GType
gtk_box_child_type (GtkContainer *container)
{
return GTK_TYPE_WIDGET;
}
static void
gtk_box_set_child_property (GtkContainer *container,
GtkWidget *child,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
gboolean expand = 0;
gboolean fill = 0;
guint padding = 0;
GtkPackType pack_type = 0;
if (property_id != CHILD_PROP_POSITION)
gtk_box_query_child_packing (GTK_BOX (container),
child,
&expand,
&fill,
&padding,
&pack_type);
switch (property_id)
{
case CHILD_PROP_EXPAND:
gtk_box_set_child_packing (GTK_BOX (container),
child,
g_value_get_boolean (value),
fill,
padding,
pack_type);
break;
case CHILD_PROP_FILL:
gtk_box_set_child_packing (GTK_BOX (container),
child,
expand,
g_value_get_boolean (value),
padding,
pack_type);
break;
case CHILD_PROP_PADDING:
gtk_box_set_child_packing (GTK_BOX (container),
child,
expand,
fill,
g_value_get_uint (value),
pack_type);
break;
case CHILD_PROP_PACK_TYPE:
gtk_box_set_child_packing (GTK_BOX (container),
child,
expand,
fill,
padding,
g_value_get_enum (value));
break;
case CHILD_PROP_POSITION:
gtk_box_reorder_child (GTK_BOX (container),
child,
g_value_get_int (value));
break;
default:
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
break;
}
}
static void
gtk_box_get_child_property (GtkContainer *container,
GtkWidget *child,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
gboolean expand = FALSE;
gboolean fill = FALSE;
guint padding = 0;
GtkPackType pack_type = 0;
GList *list;
if (property_id != CHILD_PROP_POSITION)
gtk_box_query_child_packing (GTK_BOX (container),
child,
&expand,
&fill,
&padding,
&pack_type);
switch (property_id)
{
guint i;
case CHILD_PROP_EXPAND:
g_value_set_boolean (value, expand);
break;
case CHILD_PROP_FILL:
g_value_set_boolean (value, fill);
break;
case CHILD_PROP_PADDING:
g_value_set_uint (value, padding);
break;
case CHILD_PROP_PACK_TYPE:
g_value_set_enum (value, pack_type);
break;
case CHILD_PROP_POSITION:
i = 0;
for (list = GTK_BOX (container)->priv->children; list; list = list->next)
{
GtkBoxChild *child_entry;
child_entry = list->data;
if (child_entry->widget == child)
break;
i++;
}
g_value_set_int (value, list ? i : -1);
break;
default:
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
break;
}
}
typedef struct _CountingData CountingData;
struct _CountingData {
GtkWidget *widget;
gboolean found;
guint before;
guint after;
};
static void
count_widget_position (GtkWidget *widget,
gpointer data)
{
CountingData *count = data;
if (!gtk_widget_get_visible (widget))
return;
if (count->widget == widget)
count->found = TRUE;
else if (count->found)
count->after++;
else
count->before++;
}
static gint
gtk_box_get_visible_position (GtkBox *box,
GtkWidget *child)
{
CountingData count = { child, FALSE, 0, 0 };
/* foreach iterates in visible order */
gtk_container_foreach (GTK_CONTAINER (box),
count_widget_position,
&count);
/* the child wasn't found, it's likely an internal child of some
* subclass, return -1 to indicate that there is no sibling relation
* to the regular box children
*/
if (!count.found)
return -1;
if (box->priv->orientation == GTK_ORIENTATION_HORIZONTAL &&
gtk_widget_get_direction (GTK_WIDGET (box)) == GTK_TEXT_DIR_RTL)
return count.after;
else
return count.before;
}
static GtkWidgetPath *
gtk_box_get_path_for_child (GtkContainer *container,
GtkWidget *child)
{
GtkWidgetPath *path, *sibling_path;
GtkBox *box;
GtkBoxPrivate *private;
GList *list, *children;
box = GTK_BOX (container);
private = box->priv;
path = _gtk_widget_create_path (GTK_WIDGET (container));
if (gtk_widget_get_visible (child))
{
gint position;
sibling_path = gtk_widget_path_new ();
/* get_children works in visible order */
children = gtk_container_get_children (container);
if (private->orientation == GTK_ORIENTATION_HORIZONTAL &&
gtk_widget_get_direction (GTK_WIDGET (box)) == GTK_TEXT_DIR_RTL)
children = g_list_reverse (children);
for (list = children; list; list = list->next)
{
if (!gtk_widget_get_visible (list->data))
continue;
gtk_widget_path_append_for_widget (sibling_path, list->data);
}
g_list_free (children);
position = gtk_box_get_visible_position (box, child);
if (position >= 0)
gtk_widget_path_append_with_siblings (path, sibling_path, position);
else
gtk_widget_path_append_for_widget (path, child);
gtk_widget_path_unref (sibling_path);
}
else
gtk_widget_path_append_for_widget (path, child);
return path;
}
static void
gtk_box_invalidate_order_foreach (GtkWidget *widget)
{
_gtk_widget_invalidate_style_context (widget, GTK_CSS_CHANGE_POSITION | GTK_CSS_CHANGE_SIBLING_POSITION);
}
static void
gtk_box_invalidate_order (GtkBox *box)
{
gtk_container_foreach (GTK_CONTAINER (box),
(GtkCallback) gtk_box_invalidate_order_foreach,
NULL);
}
static void
gtk_box_direction_changed (GtkWidget *widget,
GtkTextDirection previous_direction)
{
gtk_box_invalidate_order (GTK_BOX (widget));
}
static void
box_child_visibility_notify_cb (GObject *obj,
GParamSpec *pspec,
gpointer user_data)
{
GtkBox *box = user_data;
gtk_box_invalidate_order (box);
}
static void
gtk_box_pack (GtkBox *box,
GtkWidget *child,
gboolean expand,
gboolean fill,
guint padding,
GtkPackType pack_type)
{
GtkBoxPrivate *private = box->priv;
GtkBoxChild *child_info;
g_return_if_fail (GTK_IS_BOX (box));
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (gtk_widget_get_parent (child) == NULL);
child_info = g_new (GtkBoxChild, 1);
child_info->widget = child;
child_info->padding = padding;
child_info->expand = expand ? TRUE : FALSE;
child_info->fill = fill ? TRUE : FALSE;
child_info->pack = pack_type;
private->children = g_list_append (private->children, child_info);
gtk_widget_freeze_child_notify (child);
gtk_box_invalidate_order (box);
gtk_widget_set_parent (child, GTK_WIDGET (box));
g_signal_connect (child, "notify::visible",
G_CALLBACK (box_child_visibility_notify_cb), box);
gtk_widget_child_notify (child, "expand");
gtk_widget_child_notify (child, "fill");
gtk_widget_child_notify (child, "padding");
gtk_widget_child_notify (child, "pack-type");
gtk_widget_child_notify (child, "position");
gtk_widget_thaw_child_notify (child);
}
static void
gtk_box_get_size (GtkWidget *widget,
GtkOrientation orientation,
gint *minimum_size,
gint *natural_size)
{
GtkBox *box;
GtkBoxPrivate *private;
GList *children;
gint nvis_children;
gint minimum, natural;
box = GTK_BOX (widget);
private = box->priv;
minimum = natural = 0;
nvis_children = 0;
for (children = private->children; children; children = children->next)
{
GtkBoxChild *child = children->data;
if (gtk_widget_get_visible (child->widget))
{
gint child_minimum, child_natural;
if (orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_width (child->widget,
&child_minimum, &child_natural);
else
gtk_widget_get_preferred_height (child->widget,
&child_minimum, &child_natural);
if (private->orientation == orientation)
{
if (private->homogeneous)
{
gint largest;
largest = child_minimum + child->padding * 2;
minimum = MAX (minimum, largest);
largest = child_natural + child->padding * 2;
natural = MAX (natural, largest);
}
else
{
minimum += child_minimum + child->padding * 2;
natural += child_natural + child->padding * 2;
}
}
else
{
/* The biggest mins and naturals in the opposing orientation */
minimum = MAX (minimum, child_minimum);
natural = MAX (natural, child_natural);
}
nvis_children += 1;
}
}
if (nvis_children > 0 && private->orientation == orientation)
{
if (private->homogeneous)
{
minimum *= nvis_children;
natural *= nvis_children;
}
minimum += (nvis_children - 1) * private->spacing;
natural += (nvis_children - 1) * private->spacing;
}
if (minimum_size)
*minimum_size = minimum;
if (natural_size)
*natural_size = natural;
}
static void
gtk_box_get_preferred_width (GtkWidget *widget,
gint *minimum_size,
gint *natural_size)
{
gtk_box_get_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
}
static void
gtk_box_get_preferred_height (GtkWidget *widget,
gint *minimum_size,
gint *natural_size)
{
gtk_box_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
}
static void
gtk_box_compute_size_for_opposing_orientation (GtkBox *box,
gint avail_size,
gint *minimum_size,
gint *natural_size)
{
GtkBoxPrivate *private = box->priv;
GtkBoxChild *child;
GList *children;
gint nvis_children;
gint nexpand_children;
gint computed_minimum = 0, computed_natural = 0;
GtkRequestedSize *sizes;
GtkPackType packing;
gint size, extra, i;
gint child_size, child_minimum, child_natural;
gint n_extra_widgets = 0;
count_expand_children (box, &nvis_children, &nexpand_children);
if (nvis_children <= 0)
return;
sizes = g_newa (GtkRequestedSize, nvis_children);
size = avail_size - (nvis_children - 1) * private->spacing;
/* Retrieve desired size for visible children */
for (i = 0, children = private->children; children; children = children->next)
{
child = children->data;
if (gtk_widget_get_visible (child->widget))
{
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_width (child->widget,
&sizes[i].minimum_size,
&sizes[i].natural_size);
else
gtk_widget_get_preferred_height (child->widget,
&sizes[i].minimum_size,
&sizes[i].natural_size);
/* Assert the api is working properly */
if (sizes[i].minimum_size < 0)
g_error ("GtkBox child %s minimum %s: %d < 0",
gtk_widget_get_name (GTK_WIDGET (child->widget)),
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? "width" : "height",
sizes[i].minimum_size);
if (sizes[i].natural_size < sizes[i].minimum_size)
g_error ("GtkBox child %s natural %s: %d < minimum %d",
gtk_widget_get_name (GTK_WIDGET (child->widget)),
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? "width" : "height",
sizes[i].natural_size,
sizes[i].minimum_size);
size -= sizes[i].minimum_size;
size -= child->padding * 2;
sizes[i].data = child;
i += 1;
}
}
if (private->homogeneous)
{
/* If were homogenous we still need to run the above loop to get the
* minimum sizes for children that are not going to fill
*/
size = avail_size - (nvis_children - 1) * private->spacing;
extra = size / nvis_children;
n_extra_widgets = size % nvis_children;
}
else
{
/* Bring children up to size first */
size = gtk_distribute_natural_allocation (MAX (0, size), nvis_children, sizes);
/* Calculate space which hasn't distributed yet,
* and is available for expanding children.
*/
if (nexpand_children > 0)
{
extra = size / nexpand_children;
n_extra_widgets = size % nexpand_children;
}
else
extra = 0;
}
/* Allocate child positions. */
for (packing = GTK_PACK_START; packing <= GTK_PACK_END; ++packing)
{
for (i = 0, children = private->children;
children;
children = children->next)
{
child = children->data;
/* If widget is not visible, skip it. */
if (!gtk_widget_get_visible (child->widget))
continue;
/* If widget is packed differently skip it, but still increment i,
* since widget is visible and will be handled in next loop iteration.
*/
if (child->pack != packing)
{
i++;
continue;
}
if (child->pack == packing)
{
/* Assign the child's size. */
if (private->homogeneous)
{
child_size = extra;
if (n_extra_widgets > 0)
{
child_size++;
n_extra_widgets--;
}
}
else
{
child_size = sizes[i].minimum_size + child->padding * 2;
if (child->expand || gtk_widget_compute_expand (child->widget, private->orientation))
{
child_size += extra;
if (n_extra_widgets > 0)
{
child_size++;
n_extra_widgets--;
}
}
}
if (child->fill)
{
child_size = MAX (1, child_size - child->padding * 2);
}
else
{
child_size = sizes[i].minimum_size;
}
/* Assign the child's position. */
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_height_for_width (child->widget,
child_size, &child_minimum, &child_natural);
else /* (private->orientation == GTK_ORIENTATION_VERTICAL) */
gtk_widget_get_preferred_width_for_height (child->widget,
child_size, &child_minimum, &child_natural);
computed_minimum = MAX (computed_minimum, child_minimum);
computed_natural = MAX (computed_natural, child_natural);
}
i += 1;
}
}
if (minimum_size)
*minimum_size = computed_minimum;
if (natural_size)
*natural_size = computed_natural;
}
static void
gtk_box_compute_size_for_orientation (GtkBox *box,
gint avail_size,
gint *minimum_size,
gint *natural_size)
{
GtkBoxPrivate *private = box->priv;
GList *children;
gint nvis_children = 0;
gint required_size = 0, required_natural = 0, child_size, child_natural;
gint largest_child = 0, largest_natural = 0;
for (children = private->children; children != NULL;
children = children->next)
{
GtkBoxChild *child = children->data;
if (gtk_widget_get_visible (child->widget))
{
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_width_for_height (child->widget,
avail_size, &child_size, &child_natural);
else
gtk_widget_get_preferred_height_for_width (child->widget,
avail_size, &child_size, &child_natural);
child_size += child->padding * 2;
child_natural += child->padding * 2;
if (child_size > largest_child)
largest_child = child_size;
if (child_natural > largest_natural)
largest_natural = child_natural;
required_size += child_size;
required_natural += child_natural;
nvis_children += 1;
}
}
if (nvis_children > 0)
{
if (private->homogeneous)
{
required_size = largest_child * nvis_children;
required_natural = largest_natural * nvis_children;
}
required_size += (nvis_children - 1) * private->spacing;
required_natural += (nvis_children - 1) * private->spacing;
}
if (minimum_size)
*minimum_size = required_size;
if (natural_size)
*natural_size = required_natural;
}
static void
gtk_box_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum_width,
gint *natural_width)
{
GtkBox *box = GTK_BOX (widget);
GtkBoxPrivate *private = box->priv;
if (private->orientation == GTK_ORIENTATION_VERTICAL)
gtk_box_compute_size_for_opposing_orientation (box, height, minimum_width, natural_width);
else
gtk_box_compute_size_for_orientation (box, height, minimum_width, natural_width);
}
static void
gtk_box_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height)
{
GtkBox *box = GTK_BOX (widget);
GtkBoxPrivate *private = box->priv;
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_box_compute_size_for_opposing_orientation (box, width, minimum_height, natural_height);
else
gtk_box_compute_size_for_orientation (box, width, minimum_height, natural_height);
}
/**
* gtk_box_new:
* @orientation: the box's orientation.
* @spacing: the number of pixels to place by default between children.
*
* Creates a new #GtkBox.
*
* Return value: a new #GtkBox.
*
* Since: 3.0
**/
GtkWidget*
gtk_box_new (GtkOrientation orientation,
gint spacing)
{
return g_object_new (GTK_TYPE_BOX,
"orientation", orientation,
"spacing", spacing,
NULL);
}
/**
* gtk_box_pack_start:
* @box: a #GtkBox
* @child: the #GtkWidget to be added to @box
* @expand: %TRUE if the new child is to be given extra space allocated
* to @box. The extra space will be divided evenly between all children
* that use this option
* @fill: %TRUE if space given to @child by the @expand option is
* actually allocated to @child, rather than just padding it. This
* parameter has no effect if @expand is set to %FALSE. A child is
* always allocated the full height of a horizontal #GtkBox and the full width
* of a vertical #GtkBox. This option affects the other dimension
* @padding: extra space in pixels to put between this child and its
* neighbors, over and above the global amount specified by
* #GtkBox:spacing property. If @child is a widget at one of the
* reference ends of @box, then @padding pixels are also put between
* @child and the reference edge of @box
*
* Adds @child to @box, packed with reference to the start of @box.
* The @child is packed after any other child packed with reference
* to the start of @box.
*/
void
gtk_box_pack_start (GtkBox *box,
GtkWidget *child,
gboolean expand,
gboolean fill,
guint padding)
{
gtk_box_pack (box, child, expand, fill, padding, GTK_PACK_START);
}
/**
* gtk_box_pack_end:
* @box: a #GtkBox
* @child: the #GtkWidget to be added to @box
* @expand: %TRUE if the new child is to be given extra space allocated
* to @box. The extra space will be divided evenly between all children
* of @box that use this option
* @fill: %TRUE if space given to @child by the @expand option is
* actually allocated to @child, rather than just padding it. This
* parameter has no effect if @expand is set to %FALSE. A child is
* always allocated the full height of a horizontal #GtkBox and the full width
* of a vertical #GtkBox. This option affects the other dimension
* @padding: extra space in pixels to put between this child and its
* neighbors, over and above the global amount specified by
* #GtkBox:spacing property. If @child is a widget at one of the
* reference ends of @box, then @padding pixels are also put between
* @child and the reference edge of @box
*
* Adds @child to @box, packed with reference to the end of @box.
* The @child is packed after (away from end of) any other child
* packed with reference to the end of @box.
*/
void
gtk_box_pack_end (GtkBox *box,
GtkWidget *child,
gboolean expand,
gboolean fill,
guint padding)
{
gtk_box_pack (box, child, expand, fill, padding, GTK_PACK_END);
}
/**
* gtk_box_set_homogeneous:
* @box: a #GtkBox
* @homogeneous: a boolean value, %TRUE to create equal allotments,
* %FALSE for variable allotments
*
* Sets the #GtkBox:homogeneous property of @box, controlling
* whether or not all children of @box are given equal space
* in the box.
*/
void
gtk_box_set_homogeneous (GtkBox *box,
gboolean homogeneous)
{
GtkBoxPrivate *private;
g_return_if_fail (GTK_IS_BOX (box));
private = box->priv;
if ((homogeneous ? TRUE : FALSE) != private->homogeneous)
{
private->homogeneous = homogeneous ? TRUE : FALSE;
g_object_notify (G_OBJECT (box), "homogeneous");
gtk_widget_queue_resize (GTK_WIDGET (box));
}
}
/**
* gtk_box_get_homogeneous:
* @box: a #GtkBox
*
* Returns whether the box is homogeneous (all children are the
* same size). See gtk_box_set_homogeneous().
*
* Return value: %TRUE if the box is homogeneous.
**/
gboolean
gtk_box_get_homogeneous (GtkBox *box)
{
g_return_val_if_fail (GTK_IS_BOX (box), FALSE);
return box->priv->homogeneous;
}
/**
* gtk_box_set_spacing:
* @box: a #GtkBox
* @spacing: the number of pixels to put between children
*
* Sets the #GtkBox:spacing property of @box, which is the
* number of pixels to place between children of @box.
*/
void
gtk_box_set_spacing (GtkBox *box,
gint spacing)
{
GtkBoxPrivate *private;
g_return_if_fail (GTK_IS_BOX (box));
private = box->priv;
if (spacing != private->spacing)
{
private->spacing = spacing;
_gtk_box_set_spacing_set (box, TRUE);
g_object_notify (G_OBJECT (box), "spacing");
gtk_widget_queue_resize (GTK_WIDGET (box));
}
}
/**
* gtk_box_get_spacing:
* @box: a #GtkBox
*
* Gets the value set by gtk_box_set_spacing().
*
* Return value: spacing between children
**/
gint
gtk_box_get_spacing (GtkBox *box)
{
g_return_val_if_fail (GTK_IS_BOX (box), 0);
return box->priv->spacing;
}
void
_gtk_box_set_spacing_set (GtkBox *box,
gboolean spacing_set)
{
GtkBoxPrivate *private;
g_return_if_fail (GTK_IS_BOX (box));
private = box->priv;
private->spacing_set = spacing_set ? TRUE : FALSE;
}
gboolean
_gtk_box_get_spacing_set (GtkBox *box)
{
GtkBoxPrivate *private;
g_return_val_if_fail (GTK_IS_BOX (box), FALSE);
private = box->priv;
return private->spacing_set;
}
/**
* gtk_box_reorder_child:
* @box: a #GtkBox
* @child: the #GtkWidget to move
* @position: the new position for @child in the list of children
* of @box, starting from 0. If negative, indicates the end of
* the list
*
* Moves @child to a new @position in the list of @box children.
* The list is the <structfield>children</structfield> field of
* #GtkBox-struct, and contains both widgets packed #GTK_PACK_START
* as well as widgets packed #GTK_PACK_END, in the order that these
* widgets were added to @box.
*
* A widget's position in the @box children list determines where
* the widget is packed into @box. A child widget at some position
* in the list will be packed just after all other widgets of the
* same packing type that appear earlier in the list.
*/
void
gtk_box_reorder_child (GtkBox *box,
GtkWidget *child,
gint position)
{
GtkBoxPrivate *priv;
GList *old_link;
GList *new_link;
GtkBoxChild *child_info = NULL;
gint old_position;
g_return_if_fail (GTK_IS_BOX (box));
g_return_if_fail (GTK_IS_WIDGET (child));
priv = box->priv;
old_link = priv->children;
old_position = 0;
while (old_link)
{
child_info = old_link->data;
if (child_info->widget == child)
break;
old_link = old_link->next;
old_position++;
}
g_return_if_fail (old_link != NULL);
if (position == old_position)
return;
priv->children = g_list_delete_link (priv->children, old_link);
if (position < 0)
new_link = NULL;
else
new_link = g_list_nth (priv->children, position);
priv->children = g_list_insert_before (priv->children, new_link, child_info);
gtk_widget_child_notify (child, "position");
if (gtk_widget_get_visible (child)
&& gtk_widget_get_visible (GTK_WIDGET (box)))
{
gtk_box_invalidate_order (box);
gtk_widget_queue_resize (child);
}
}
/**
* gtk_box_query_child_packing:
* @box: a #GtkBox
* @child: the #GtkWidget of the child to query
* @expand: (out): pointer to return location for #GtkBox:expand child
* property
* @fill: (out): pointer to return location for #GtkBox:fill child
* property
* @padding: (out): pointer to return location for #GtkBox:padding
* child property
* @pack_type: (out): pointer to return location for #GtkBox:pack-type
* child property
*
* Obtains information about how @child is packed into @box.
*/
void
gtk_box_query_child_packing (GtkBox *box,
GtkWidget *child,
gboolean *expand,
gboolean *fill,
guint *padding,
GtkPackType *pack_type)
{
GtkBoxPrivate *private;
GList *list;
GtkBoxChild *child_info = NULL;
g_return_if_fail (GTK_IS_BOX (box));
g_return_if_fail (GTK_IS_WIDGET (child));
private = box->priv;
list = private->children;
while (list)
{
child_info = list->data;
if (child_info->widget == child)
break;
list = list->next;
}
if (list)
{
if (expand)
*expand = child_info->expand;
if (fill)
*fill = child_info->fill;
if (padding)
*padding = child_info->padding;
if (pack_type)
*pack_type = child_info->pack;
}
}
/**
* gtk_box_set_child_packing:
* @box: a #GtkBox
* @child: the #GtkWidget of the child to set
* @expand: the new value of the #GtkBox:expand child property
* @fill: the new value of the #GtkBox:fill child property
* @padding: the new value of the #GtkBox:padding child property
* @pack_type: the new value of the #GtkBox:pack-type child property
*
* Sets the way @child is packed into @box.
*/
void
gtk_box_set_child_packing (GtkBox *box,
GtkWidget *child,
gboolean expand,
gboolean fill,
guint padding,
GtkPackType pack_type)
{
GtkBoxPrivate *private;
GList *list;
GtkBoxChild *child_info = NULL;
g_return_if_fail (GTK_IS_BOX (box));
g_return_if_fail (GTK_IS_WIDGET (child));
private = box->priv;
list = private->children;
while (list)
{
child_info = list->data;
if (child_info->widget == child)
break;
list = list->next;
}
gtk_widget_freeze_child_notify (child);
if (list)
{
gboolean expanded;
expanded = expand != FALSE;
/* avoid setting expand if unchanged, since queue_compute_expand
* can be expensive-ish
*/
if (child_info->expand != expanded)
{
child_info->expand = expand != FALSE;
gtk_widget_queue_compute_expand (GTK_WIDGET (box));
gtk_widget_child_notify (child, "expand");
}
child_info->fill = fill != FALSE;
gtk_widget_child_notify (child, "fill");
child_info->padding = padding;
gtk_widget_child_notify (child, "padding");
if (pack_type != GTK_PACK_END)
pack_type = GTK_PACK_START;
if (child_info->pack != pack_type)
{
child_info->pack = pack_type;
gtk_widget_child_notify (child, "pack-type");
gtk_box_invalidate_order (box);
}
if (gtk_widget_get_visible (child)
&& gtk_widget_get_visible (GTK_WIDGET (box)))
gtk_widget_queue_resize (child);
}
gtk_widget_thaw_child_notify (child);
}
void
_gtk_box_set_old_defaults (GtkBox *box)
{
GtkBoxPrivate *private;
g_return_if_fail (GTK_IS_BOX (box));
private = box->priv;
private->default_expand = TRUE;
}
static void
gtk_box_add (GtkContainer *container,
GtkWidget *widget)
{
GtkBoxPrivate *priv = GTK_BOX (container)->priv;
gtk_box_pack_start (GTK_BOX (container), widget,
priv->default_expand,
TRUE,
0);
}
static void
gtk_box_remove (GtkContainer *container,
GtkWidget *widget)
{
GtkBox *box = GTK_BOX (container);
GtkBoxPrivate *priv = box->priv;
GtkBoxChild *child;
GList *children;
children = priv->children;
while (children)
{
child = children->data;
if (child->widget == widget)
{
gboolean was_visible;
g_signal_handlers_disconnect_by_func (widget,
box_child_visibility_notify_cb,
box);
was_visible = gtk_widget_get_visible (widget);
gtk_widget_unparent (widget);
priv->children = g_list_remove_link (priv->children, children);
g_list_free (children);
g_free (child);
/* queue resize regardless of gtk_widget_get_visible (container),
* since that's what is needed by toplevels.
*/
if (was_visible)
{
gtk_box_invalidate_order (box);
gtk_widget_queue_resize (GTK_WIDGET (container));
}
break;
}
children = children->next;
}
}
static void
gtk_box_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
GtkBox *box = GTK_BOX (container);
GtkBoxPrivate *priv = box->priv;
GtkBoxChild *child;
GList *children;
children = priv->children;
while (children)
{
child = children->data;
children = children->next;
if (child->pack == GTK_PACK_START)
(* callback) (child->widget, callback_data);
}
children = g_list_last (priv->children);
while (children)
{
child = children->data;
children = children->prev;
if (child->pack == GTK_PACK_END)
(* callback) (child->widget, callback_data);
}
}
GList *
_gtk_box_get_children (GtkBox *box)
{
GtkBoxPrivate *priv;
GtkBoxChild *child;
GList *children;
GList *retval = NULL;
g_return_val_if_fail (GTK_IS_BOX (box), NULL);
priv = box->priv;
children = priv->children;
while (children)
{
child = children->data;
children = children->next;
retval = g_list_prepend (retval, child->widget);
}
return g_list_reverse (retval);
}
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