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gtk2/gtk/gtkbox.c
Michael Natterer a6151ebb95 GtkBox: make get_path_for_child() work if there are internal children 
Use foreach() instead of forall() to find the child's siblings
because internal children of subclasses have no sibling relation
to the box' children. Also deal with the subclass failing to
implement get_path_for_child(). This caused an infinite widget
path invalidation loop of sorts with GimpMessageBox, which is a
vertical box with a decorative icon to the left.
2011-09-26 00:52:28 +02:00

1893 lines
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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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* 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, #GtkTable, #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 "gtkorientable.h"
#include "gtksizerequest.h"
#include "gtktypebuiltins.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include "a11y/gtkboxaccessible.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_type (widget_class, GTK_TYPE_BOX_ACCESSIBLE);
}
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_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_path_copy (gtk_widget_get_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 (GtkBox *box)
{
gtk_container_foreach (GTK_CONTAINER (box),
(GtkCallback) gtk_widget_reset_style,
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 = GTK_PACK_END;
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;
was_visible = gtk_widget_get_visible (widget);
gtk_widget_unparent (widget);
g_signal_handlers_disconnect_by_func (widget,
box_child_visibility_notify_cb,
box);
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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