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gtk2/gtk/gtkbox.c
Carlos Garcia Campos 170cb01675 Revert "Remove _gtk_box_get_children" 
This reverts commit 572e9a0402.

_gtk_box_get_children was not doing exactly the same than
gtk_container_get_children does, because the latter uses the forall
implementation of GtkBox that takes into account the children pack mode while
the former just iterated the list of children. This broke the order of
the buttons in a GtkButtonBox when they were packaged with PACK_END.
2016-02-12 13:29:21 +01:00

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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 packing. Packing refers
* to adding widgets with reference to a particular position in a
* #GtkContainer. For a GtkBox, there are two reference positions: the
* start and the end 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 expand and fill child properties. 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 between the children, while
* padding added by gtk_box_pack_start() or gtk_box_pack_end() is added
* on either side 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 expand,
* fill and padding child properties.
* Use gtk_box_query_child_packing() to query these fields.
*
* Note that a single-row or single-column #GtkGrid provides exactly
* the same functionality as #GtkBox.
*
* # CSS nodes
*
* GtkBox uses a single CSS node with name box.
*
* In horizontal orientation, the nodes of the children are always arranged
* from left to right. So :first-child will always select the leftmost child,
* regardless of text direction.
*/
#include "config.h"
#include "gtkbox.h"
#include "gtkboxprivate.h"
#include "gtkcontainerprivate.h"
#include "gtkcsscustomgadgetprivate.h"
#include "gtkcssnodeprivate.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_SPACING,
PROP_HOMOGENEOUS,
PROP_BASELINE_POSITION,
/* orientable */
PROP_ORIENTATION,
LAST_PROP = PROP_ORIENTATION
};
enum {
CHILD_PROP_0,
CHILD_PROP_EXPAND,
CHILD_PROP_FILL,
CHILD_PROP_PADDING,
CHILD_PROP_PACK_TYPE,
CHILD_PROP_POSITION,
LAST_CHILD_PROP
};
typedef struct _GtkBoxChild GtkBoxChild;
struct _GtkBoxPrivate
{
GList *children;
GtkBoxChild *center;
GtkCssGadget *gadget;
GtkOrientation orientation;
gint16 spacing;
guint default_expand : 1;
guint homogeneous : 1;
guint spacing_set : 1;
guint baseline_pos : 2;
};
static GParamSpec *props[LAST_PROP] = { NULL, };
static GParamSpec *child_props[LAST_CHILD_PROP] = { NULL, };
/*
* 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 gboolean gtk_box_draw (GtkWidget *widget,
cairo_t *cr);
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);
static void gtk_box_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height,
gint *minimum_baseline,
gint *natural_baseline);
static void gtk_box_buildable_init (GtkBuildableIface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkBox, gtk_box, GTK_TYPE_CONTAINER,
G_ADD_PRIVATE (GtkBox)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL)
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, gtk_box_buildable_init))
static void
gtk_box_dispose (GObject *object)
{
GtkBox *box = GTK_BOX (object);
GtkBoxPrivate *priv = box->priv;
g_clear_object (&priv->gadget);
G_OBJECT_CLASS (gtk_box_parent_class)->dispose (object);
}
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;
object_class->dispose = gtk_box_dispose;
widget_class->draw = gtk_box_draw;
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_height_and_baseline_for_width = gtk_box_get_preferred_height_and_baseline_for_width;
widget_class->get_preferred_width_for_height = gtk_box_get_preferred_width_for_height;
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");
props[PROP_SPACING] =
g_param_spec_int ("spacing",
P_("Spacing"),
P_("The amount of space between children"),
0, G_MAXINT, 0,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
props[PROP_HOMOGENEOUS] =
g_param_spec_boolean ("homogeneous",
P_("Homogeneous"),
P_("Whether the children should all be the same size"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
props[PROP_BASELINE_POSITION] =
g_param_spec_enum ("baseline-position",
P_("Baseline position"),
P_("The position of the baseline aligned widgets if extra space is available"),
GTK_TYPE_BASELINE_POSITION,
GTK_BASELINE_POSITION_CENTER,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (object_class, LAST_PROP, props);
/**
* 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.
*
* In contrast to #GtkWidget:hexpand, the expand child property does
* not cause the box to expand itself.
*/
child_props[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.
*/
child_props[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);
child_props[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);
child_props[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);
child_props[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);
gtk_container_class_install_child_properties (container_class, LAST_CHILD_PROP, child_props);
gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_FILLER);
gtk_widget_class_set_css_name (widget_class, "box");
}
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:
{
GtkOrientation orientation = g_value_get_enum (value);
if (private->orientation != orientation)
{
private->orientation = orientation;
_gtk_orientable_set_style_classes (GTK_ORIENTABLE (box));
gtk_widget_queue_resize (GTK_WIDGET (box));
g_object_notify (object, "orientation");
}
}
break;
case PROP_SPACING:
gtk_box_set_spacing (box, g_value_get_int (value));
break;
case PROP_BASELINE_POSITION:
gtk_box_set_baseline_position (box, g_value_get_enum (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_BASELINE_POSITION:
g_value_set_enum (value, private->baseline_pos);
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 gboolean
gtk_box_draw_contents (GtkCssGadget *gadget,
cairo_t *cr,
int x,
int y,
int width,
int height,
gpointer unused)
{
GTK_WIDGET_CLASS (gtk_box_parent_class)->draw (gtk_css_gadget_get_owner (gadget), cr);
return FALSE;
}
static gboolean
gtk_box_draw (GtkWidget *widget,
cairo_t *cr)
{
gtk_css_gadget_draw (GTK_BOX (widget)->priv->gadget, cr);
return FALSE;
}
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_no_center (GtkWidget *widget,
const 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;
gint child_minimum_baseline, child_natural_baseline;
gint minimum_above, natural_above;
gint minimum_below, natural_below;
gboolean have_baseline;
gint baseline;
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;
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;
have_baseline = FALSE;
minimum_above = natural_above = 0;
minimum_below = natural_below = 0;
/* 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_and_baseline_for_width (child->widget,
allocation->width,
&sizes[i].minimum_size,
&sizes[i].natural_size,
NULL, NULL);
/* 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 sizes. */
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;
}
/* 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--;
}
}
}
sizes[i].natural_size = child_size;
if (private->orientation == GTK_ORIENTATION_HORIZONTAL &&
gtk_widget_get_valign_with_baseline (child->widget) == GTK_ALIGN_BASELINE)
{
int child_allocation_width;
int child_minimum_height, child_natural_height;
if (child->fill)
child_allocation_width = MAX (1, child_size - child->padding * 2);
else
child_allocation_width = sizes[i].minimum_size;
child_minimum_baseline = -1;
child_natural_baseline = -1;
gtk_widget_get_preferred_height_and_baseline_for_width (child->widget,
child_allocation_width,
&child_minimum_height, &child_natural_height,
&child_minimum_baseline, &child_natural_baseline);
if (child_minimum_baseline >= 0)
{
have_baseline = TRUE;
minimum_below = MAX (minimum_below, child_minimum_height - child_minimum_baseline);
natural_below = MAX (natural_below, child_natural_height - child_natural_baseline);
minimum_above = MAX (minimum_above, child_minimum_baseline);
natural_above = MAX (natural_above, child_natural_baseline);
}
}
i++;
}
}
baseline = gtk_widget_get_allocated_baseline (widget);
if (baseline == -1 && have_baseline)
{
gint height = MAX (1, allocation->height);
/* TODO: This is purely based on the minimum baseline, when things fit we should
use the natural one? */
switch (private->baseline_pos)
{
case GTK_BASELINE_POSITION_TOP:
baseline = minimum_above;
break;
case GTK_BASELINE_POSITION_CENTER:
baseline = minimum_above + (height - (minimum_above + minimum_below)) / 2;
break;
case GTK_BASELINE_POSITION_BOTTOM:
baseline = height - minimum_below;
break;
}
}
/* 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;
}
child_size = sizes[i].natural_size;
/* 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_with_baseline (child->widget, &child_allocation, baseline);
i++;
}
}
_gtk_widget_set_simple_clip (widget, NULL);
}
static void
gtk_box_size_allocate_with_center (GtkWidget *widget,
const GtkAllocation *allocation)
{
GtkBox *box = GTK_BOX (widget);
GtkBoxPrivate *priv = box->priv;
GtkBoxChild *child;
GList *children;
gint nvis[2];
gint nexp[2];
GtkTextDirection direction;
GtkAllocation child_allocation;
GtkRequestedSize *sizes[2];
GtkRequestedSize center_req;
gint child_minimum_baseline, child_natural_baseline;
gint minimum_above, natural_above;
gint minimum_below, natural_below;
gboolean have_baseline;
gint baseline;
gint idx[2];
gint center_pos;
gint center_size;
gint box_size;
gint side[2];
GtkPackType packing;
gint min_size[2];
gint nat_size[2];
gint extra[2];
gint n_extra_widgets[2];
gint x = 0, y = 0, i;
gint child_size;
nvis[0] = nvis[1] = 0;
nexp[0] = nexp[1] = 0;
for (children = priv->children; children; children = children->next)
{
child = children->data;
if (child != priv->center &&
_gtk_widget_get_visible (child->widget))
{
nvis[child->pack] += 1;
if (child->expand || gtk_widget_compute_expand (child->widget, priv->orientation))
nexp[child->pack] += 1;
}
}
direction = gtk_widget_get_direction (widget);
sizes[0] = g_newa (GtkRequestedSize, nvis[0]);
sizes[1] = g_newa (GtkRequestedSize, nvis[1]);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
box_size = allocation->width;
else
box_size = allocation->height;
have_baseline = FALSE;
minimum_above = natural_above = 0;
minimum_below = natural_below = 0;
min_size[0] = nat_size[0] = nvis[0] * priv->spacing;
min_size[1] = nat_size[1] = nvis[1] * priv->spacing;
/* Retrieve desired size for visible children. */
idx[0] = idx[1] = 0;
for (children = priv->children; children; children = children->next)
{
GtkRequestedSize *req;
child = children->data;
if (!_gtk_widget_get_visible (child->widget))
continue;
if (child == priv->center)
req = &center_req;
else
req = &(sizes[child->pack][idx[child->pack]]);
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_width_for_height (child->widget,
allocation->height,
&req->minimum_size,
&req->natural_size);
else
gtk_widget_get_preferred_height_and_baseline_for_width (child->widget,
allocation->width,
&req->minimum_size,
&req->natural_size,
NULL, NULL);
if (child != priv->center)
{
min_size[child->pack] += req->minimum_size + 2 * child->padding;
nat_size[child->pack] += req->natural_size + 2 * child->padding;
idx[child->pack] += 1;
}
req->data = child;
}
/* Determine size of center */
if (priv->center->expand)
center_size = MAX (box_size - 2 * MAX (nat_size[0], nat_size[1]), center_req.minimum_size);
else
center_size = MAX (MIN (center_req.natural_size, box_size - min_size[0] - min_size[1]), center_req.minimum_size);
if (priv->homogeneous)
{
extra[0] = ((box_size - center_size) / 2 - nvis[0] * priv->spacing) / nvis[0];
extra[1] = ((box_size - center_size) / 2 - nvis[1] * priv->spacing) / nvis[1];
extra[0] = MIN (extra[0], extra[1]);
n_extra_widgets[0] = 0;
}
else
{
for (packing = GTK_PACK_START; packing <= GTK_PACK_END; packing++)
{
gint s;
/* Distribute the remainder naturally on each side */
s = MIN ((box_size - center_size) / 2 - min_size[packing], box_size - center_size - min_size[0] - min_size[1]);
s = gtk_distribute_natural_allocation (MAX (0, s), nvis[packing], sizes[packing]);
/* Calculate space which hasn't distributed yet,
* and is available for expanding children.
*/
if (nexp[packing] > 0)
{
extra[packing] = s / nexp[packing];
n_extra_widgets[packing] = s % nexp[packing];
}
else
extra[packing] = 0;
}
}
/* Allocate child sizes. */
for (packing = GTK_PACK_START; packing <= GTK_PACK_END; ++packing)
{
for (i = 0, children = priv->children; children; children = children->next)
{
child = children->data;
/* If widget is not visible, skip it. */
if (!_gtk_widget_get_visible (child->widget))
continue;
/* Skip the center widget */
if (child == priv->center)
continue;
/* If widget is packed differently, skip it. */
if (child->pack != packing)
continue;
/* Assign the child's size. */
if (priv->homogeneous)
{
child_size = extra[0];
if (n_extra_widgets[0] > 0)
{
child_size++;
n_extra_widgets[0]--;
}
}
else
{
child_size = sizes[packing][i].minimum_size + child->padding * 2;
if (child->expand || gtk_widget_compute_expand (child->widget, priv->orientation))
{
child_size += extra[packing];
if (n_extra_widgets[packing] > 0)
{
child_size++;
n_extra_widgets[packing]--;
}
}
}
sizes[packing][i].natural_size = child_size;
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL &&
gtk_widget_get_valign_with_baseline (child->widget) == GTK_ALIGN_BASELINE)
{
gint child_allocation_width;
gint child_minimum_height, child_natural_height;
if (child->fill)
child_allocation_width = MAX (1, child_size - child->padding * 2);
else
child_allocation_width = sizes[packing][i].minimum_size;
child_minimum_baseline = -1;
child_natural_baseline = -1;
gtk_widget_get_preferred_height_and_baseline_for_width (child->widget,
child_allocation_width,
&child_minimum_height, &child_natural_height,
&child_minimum_baseline, &child_natural_baseline);
if (child_minimum_baseline >= 0)
{
have_baseline = TRUE;
minimum_below = MAX (minimum_below, child_minimum_height - child_minimum_baseline);
natural_below = MAX (natural_below, child_natural_height - child_natural_baseline);
minimum_above = MAX (minimum_above, child_minimum_baseline);
natural_above = MAX (natural_above, child_natural_baseline);
}
}
i++;
}
}
baseline = gtk_widget_get_allocated_baseline (widget);
if (baseline == -1 && have_baseline)
{
gint height = MAX (1, allocation->height);
/* TODO: This is purely based on the minimum baseline, when things fit we should
* use the natural one?
*/
switch (priv->baseline_pos)
{
case GTK_BASELINE_POSITION_TOP:
baseline = minimum_above;
break;
case GTK_BASELINE_POSITION_CENTER:
baseline = minimum_above + (height - (minimum_above + minimum_below)) / 2;
break;
case GTK_BASELINE_POSITION_BOTTOM:
baseline = height - minimum_below;
break;
}
}
/* Allocate child positions. */
for (packing = GTK_PACK_START; packing <= GTK_PACK_END; ++packing)
{
if (priv->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 = priv->children; children; children = children->next)
{
child = children->data;
/* If widget is not visible, skip it. */
if (!_gtk_widget_get_visible (child->widget))
continue;
/* Skip the center widget */
if (child == priv->center)
continue;
/* If widget is packed differently, skip it. */
if (child->pack != packing)
continue;
child_size = sizes[packing][i].natural_size;
/* Assign the child's position. */
if (priv->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[packing][i].minimum_size;
child_allocation.x = x + (child_size - child_allocation.width) / 2;
}
if (packing == GTK_PACK_START)
{
x += child_size + priv->spacing;
}
else
{
x -= child_size + priv->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[packing][i].minimum_size;
child_allocation.y = y + (child_size - child_allocation.height) / 2;
}
if (packing == GTK_PACK_START)
{
y += child_size + priv->spacing;
}
else
{
y -= child_size + priv->spacing;
child_allocation.y -= child_size;
}
}
gtk_widget_size_allocate_with_baseline (child->widget, &child_allocation, baseline);
i++;
}
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
side[packing] = x;
else
side[packing] = y;
}
/* Allocate the center widget */
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
center_pos = allocation->x + (box_size - center_size) / 2;
else
center_pos = allocation->y + (box_size - center_size) / 2;
if (center_pos < side[GTK_PACK_START])
center_pos = side[GTK_PACK_START];
else if (center_pos + center_size > side[GTK_PACK_END])
center_pos = side[GTK_PACK_END] - center_size;
if (priv->orientation == GTK_ORIENTATION_HORIZONTAL)
{
child_allocation.x = center_pos;
child_allocation.width = center_size;
}
else
{
child_allocation.y = center_pos;
child_allocation.height = center_size;
}
gtk_widget_size_allocate_with_baseline (priv->center->widget, &child_allocation, baseline);
_gtk_widget_set_simple_clip (widget, NULL);
}
static void
gtk_box_allocate_contents (GtkCssGadget *gadget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip,
gpointer unused)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkBox *box = GTK_BOX (widget);
if (box->priv->center &&
_gtk_widget_get_visible (box->priv->center->widget))
gtk_box_size_allocate_with_center (widget, allocation);
else
gtk_box_size_allocate_no_center (widget, allocation);
gtk_container_get_children_clip (GTK_CONTAINER (box), out_clip);
}
static void
gtk_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkBoxPrivate *priv = GTK_BOX (widget)->priv;
GtkAllocation clip;
gtk_widget_set_allocation (widget, allocation);
gtk_css_gadget_allocate (priv->gadget,
allocation,
gtk_widget_get_allocated_baseline (widget),
&clip);
gtk_widget_set_clip (widget, &clip);
}
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_buildable_add_child (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const gchar *type)
{
if (type && strcmp (type, "center") == 0)
gtk_box_set_center_widget (GTK_BOX (buildable), GTK_WIDGET (child));
else if (!type)
gtk_container_add (GTK_CONTAINER (buildable), GTK_WIDGET (child));
else
GTK_BUILDER_WARN_INVALID_CHILD_TYPE (GTK_BOX (buildable), type);
}
static void
gtk_box_buildable_init (GtkBuildableIface *iface)
{
iface->add_child = gtk_box_buildable_add_child;
}
static void
gtk_box_update_child_css_position (GtkBox *box,
GtkBoxChild *child_info)
{
GtkBoxPrivate *priv = box->priv;
GtkBoxChild *prev;
gboolean reverse;
GList *l;
prev = NULL;
for (l = priv->children; l->data != child_info; l = l->next)
{
GtkBoxChild *cur = l->data;
if (cur->pack == child_info->pack)
prev = cur;
}
reverse = child_info->pack == GTK_PACK_END;
if (box->priv->orientation == GTK_ORIENTATION_HORIZONTAL &&
gtk_widget_get_direction (GTK_WIDGET (box)) == GTK_TEXT_DIR_RTL)
reverse = !reverse;
if (reverse)
gtk_css_node_insert_before (gtk_widget_get_css_node (GTK_WIDGET (box)),
gtk_widget_get_css_node (child_info->widget),
prev ? gtk_widget_get_css_node (prev->widget) : NULL);
else
gtk_css_node_insert_after (gtk_widget_get_css_node (GTK_WIDGET (box)),
gtk_widget_get_css_node (child_info->widget),
prev ? gtk_widget_get_css_node (prev->widget) : NULL);
}
static void
gtk_box_direction_changed (GtkWidget *widget,
GtkTextDirection previous_direction)
{
GtkBox *box = GTK_BOX (widget);
if (box->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_css_node_reverse_children (gtk_widget_get_css_node (widget));
}
static GtkBoxChild *
gtk_box_pack (GtkBox *box,
GtkWidget *child,
gboolean expand,
gboolean fill,
guint padding,
GtkPackType pack_type)
{
GtkContainer *container = GTK_CONTAINER (box);
GtkBoxPrivate *private = box->priv;
GtkBoxChild *child_info;
g_return_val_if_fail (GTK_IS_BOX (box), NULL);
g_return_val_if_fail (GTK_IS_WIDGET (child), NULL);
g_return_val_if_fail (_gtk_widget_get_parent (child) == NULL, 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_box_update_child_css_position (box, child_info);
gtk_widget_freeze_child_notify (child);
gtk_widget_set_parent (child, GTK_WIDGET (box));
gtk_container_child_notify_by_pspec (container, child, child_props[CHILD_PROP_EXPAND]);
gtk_container_child_notify_by_pspec (container, child, child_props[CHILD_PROP_FILL]);
gtk_container_child_notify_by_pspec (container, child, child_props[CHILD_PROP_PADDING]);
gtk_container_child_notify_by_pspec (container, child, child_props[CHILD_PROP_PACK_TYPE]);
gtk_container_child_notify_by_pspec (container, child, child_props[CHILD_PROP_POSITION]);
gtk_widget_thaw_child_notify (child);
return child_info;
}
static void
gtk_box_get_size (GtkWidget *widget,
GtkOrientation orientation,
gint *minimum_size,
gint *natural_size,
gint *minimum_baseline,
gint *natural_baseline)
{
GtkBox *box;
GtkBoxPrivate *private;
GList *children;
gint nvis_children;
gint minimum, natural;
gint minimum_above, natural_above;
gint minimum_below, natural_below;
gboolean have_baseline;
gint min_baseline, nat_baseline;
gint center_min, center_nat;
box = GTK_BOX (widget);
private = box->priv;
have_baseline = FALSE;
minimum = natural = 0;
minimum_above = natural_above = 0;
minimum_below = natural_below = 0;
min_baseline = nat_baseline = -1;
nvis_children = 0;
center_min = center_nat = 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;
gint child_minimum_baseline = -1, child_natural_baseline = -1;
if (orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_width (child->widget,
&child_minimum, &child_natural);
else
gtk_widget_get_preferred_height_and_baseline_for_width (child->widget, -1,
&child_minimum, &child_natural,
&child_minimum_baseline, &child_natural_baseline);
if (private->orientation == orientation)
{
if (private->homogeneous)
{
if (child == private->center)
{
center_min = child_minimum + child->padding * 2;
center_nat = child_natural + child->padding * 2;
}
else
{
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
{
if (child_minimum_baseline >= 0)
{
have_baseline = TRUE;
minimum_below = MAX (minimum_below, child_minimum - child_minimum_baseline);
natural_below = MAX (natural_below, child_natural - child_natural_baseline);
minimum_above = MAX (minimum_above, child_minimum_baseline);
natural_above = MAX (natural_above, child_natural_baseline);
}
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)
{
if (center_min > 0)
{
minimum = minimum * (nvis_children - 1) + center_min;
natural = natural * (nvis_children - 1) + center_nat;
}
else
{
minimum *= nvis_children;
natural *= nvis_children;
}
}
minimum += (nvis_children - 1) * private->spacing;
natural += (nvis_children - 1) * private->spacing;
}
minimum = MAX (minimum, minimum_below + minimum_above);
natural = MAX (natural, natural_below + natural_above);
if (have_baseline)
{
switch (private->baseline_pos)
{
case GTK_BASELINE_POSITION_TOP:
min_baseline = minimum_above;
nat_baseline = natural_above;
break;
case GTK_BASELINE_POSITION_CENTER:
min_baseline = minimum_above + (minimum - (minimum_above + minimum_below)) / 2;
nat_baseline = natural_above + (natural - (natural_above + natural_below)) / 2;
break;
case GTK_BASELINE_POSITION_BOTTOM:
min_baseline = minimum - minimum_below;
nat_baseline = natural - natural_below;
break;
}
}
if (minimum_size)
*minimum_size = minimum;
if (natural_size)
*natural_size = natural;
if (minimum_baseline)
*minimum_baseline = min_baseline;
if (natural_baseline)
*natural_baseline = nat_baseline;
}
static void
gtk_box_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural)
{
gtk_css_gadget_get_preferred_size (GTK_BOX (widget)->priv->gadget,
GTK_ORIENTATION_HORIZONTAL,
-1,
minimum, natural,
NULL, NULL);
}
static void
gtk_box_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural)
{
gtk_css_gadget_get_preferred_size (GTK_BOX (widget)->priv->gadget,
GTK_ORIENTATION_VERTICAL,
-1,
minimum, natural,
NULL, NULL);
}
static void
gtk_box_compute_size_for_opposing_orientation (GtkBox *box,
gint avail_size,
gint *minimum_size,
gint *natural_size,
gint *minimum_baseline,
gint *natural_baseline)
{
GtkBoxPrivate *private = box->priv;
GtkBoxChild *child;
GList *children;
gint nvis_children;
gint nexpand_children;
gint computed_minimum = 0, computed_natural = 0;
gint computed_minimum_above = 0, computed_natural_above = 0;
gint computed_minimum_below = 0, computed_natural_below = 0;
gint computed_minimum_baseline = -1, computed_natural_baseline = -1;
GtkRequestedSize *sizes;
GtkPackType packing;
gint size, extra, i;
gint child_size, child_minimum, child_natural;
gint child_minimum_baseline, child_natural_baseline;
gint n_extra_widgets = 0;
gboolean have_baseline;
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;
}
have_baseline = FALSE;
/* 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;
}
child_minimum_baseline = child_natural_baseline = -1;
/* Assign the child's position. */
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_height_and_baseline_for_width (child->widget, child_size,
&child_minimum, &child_natural,
&child_minimum_baseline, &child_natural_baseline);
else /* (private->orientation == GTK_ORIENTATION_VERTICAL) */
gtk_widget_get_preferred_width_for_height (child->widget,
child_size, &child_minimum, &child_natural);
if (child_minimum_baseline >= 0)
{
have_baseline = TRUE;
computed_minimum_below = MAX (computed_minimum_below, child_minimum - child_minimum_baseline);
computed_natural_below = MAX (computed_natural_below, child_natural - child_natural_baseline);
computed_minimum_above = MAX (computed_minimum_above, child_minimum_baseline);
computed_natural_above = MAX (computed_natural_above, child_natural_baseline);
}
else
{
computed_minimum = MAX (computed_minimum, child_minimum);
computed_natural = MAX (computed_natural, child_natural);
}
}
i += 1;
}
}
if (have_baseline)
{
computed_minimum = MAX (computed_minimum, computed_minimum_below + computed_minimum_above);
computed_natural = MAX (computed_natural, computed_natural_below + computed_natural_above);
switch (private->baseline_pos)
{
case GTK_BASELINE_POSITION_TOP:
computed_minimum_baseline = computed_minimum_above;
computed_natural_baseline = computed_natural_above;
break;
case GTK_BASELINE_POSITION_CENTER:
computed_minimum_baseline = computed_minimum_above + MAX((computed_minimum - (computed_minimum_above + computed_minimum_below)) / 2, 0);
computed_natural_baseline = computed_natural_above + MAX((computed_natural - (computed_natural_above + computed_natural_below)) / 2, 0);
break;
case GTK_BASELINE_POSITION_BOTTOM:
computed_minimum_baseline = computed_minimum - computed_minimum_below;
computed_natural_baseline = computed_natural - computed_natural_below;
break;
}
}
if (minimum_baseline)
*minimum_baseline = computed_minimum_baseline;
if (natural_baseline)
*natural_baseline = computed_natural_baseline;
if (minimum_size)
*minimum_size = computed_minimum;
if (natural_size)
*natural_size = MAX (computed_natural, computed_natural_below + computed_natural_above);
}
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,
gint *natural)
{
gtk_css_gadget_get_preferred_size (GTK_BOX (widget)->priv->gadget,
GTK_ORIENTATION_HORIZONTAL,
height,
minimum, natural,
NULL, NULL);
}
static void
gtk_box_get_preferred_height_and_baseline_for_width (GtkWidget *widget,
gint width,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline)
{
gtk_css_gadget_get_preferred_size (GTK_BOX (widget)->priv->gadget,
GTK_ORIENTATION_VERTICAL,
width,
minimum, natural,
minimum_baseline, natural_baseline);
}
static void
gtk_box_get_content_size (GtkCssGadget *gadget,
GtkOrientation orientation,
gint for_size,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline,
gpointer unused)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkBox *box = GTK_BOX (widget);
GtkBoxPrivate *private = box->priv;
if (for_size < 0)
gtk_box_get_size (widget, orientation, minimum, natural, minimum_baseline, natural_baseline);
else
{
if (private->orientation != orientation)
gtk_box_compute_size_for_opposing_orientation (box, for_size, minimum, natural, minimum_baseline, natural_baseline);
else
{
if (minimum_baseline)
*minimum_baseline = -1;
if (natural_baseline)
*natural_baseline = -1;
gtk_box_compute_size_for_orientation (box, for_size, minimum, natural);
}
}
}
static void
gtk_box_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height)
{
gtk_box_get_preferred_height_and_baseline_for_width (widget, width, minimum_height, natural_height, NULL, NULL);
}
static void
gtk_box_init (GtkBox *box)
{
GtkBoxPrivate *private;
box->priv = gtk_box_get_instance_private (box);
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;
private->baseline_pos = GTK_BASELINE_POSITION_CENTER;
private->gadget = gtk_css_custom_gadget_new_for_node (gtk_widget_get_css_node (GTK_WIDGET (box)),
GTK_WIDGET (box),
gtk_box_get_content_size,
gtk_box_allocate_contents,
gtk_box_draw_contents,
NULL,
NULL);
_gtk_orientable_set_style_classes (GTK_ORIENTABLE (box));
}
GtkCssGadget *
gtk_box_get_gadget (GtkBox *box)
{
return box->priv->gadget;
}
/**
* gtk_box_new:
* @orientation: the box’s orientation.
* @spacing: the number of pixels to place by default between children.
*
* Creates a new #GtkBox.
*
* Returns: 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;
homogeneous = homogeneous != FALSE;
if (private->homogeneous != homogeneous)
{
private->homogeneous = homogeneous;
g_object_notify_by_pspec (G_OBJECT (box), props[PROP_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().
*
* Returns: %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 (private->spacing != spacing)
{
private->spacing = spacing;
_gtk_box_set_spacing_set (box, TRUE);
g_object_notify_by_pspec (G_OBJECT (box), props[PROP_SPACING]);
gtk_widget_queue_resize (GTK_WIDGET (box));
}
}
/**
* gtk_box_get_spacing:
* @box: a #GtkBox
*
* Gets the value set by gtk_box_set_spacing().
*
* Returns: spacing between children
**/
gint
gtk_box_get_spacing (GtkBox *box)
{
g_return_val_if_fail (GTK_IS_BOX (box), 0);
return box->priv->spacing;
}
/**
* gtk_box_set_baseline_position:
* @box: a #GtkBox
* @position: a #GtkBaselinePosition
*
* Sets the baseline position of a box. This affects
* only horizontal boxes with at least one baseline aligned
* child. If there is more vertical space available than requested,
* and the baseline is not allocated by the parent then
* @position is used to allocate the baseline wrt the
* extra space available.
*
* Since: 3.10
*/
void
gtk_box_set_baseline_position (GtkBox *box,
GtkBaselinePosition position)
{
GtkBoxPrivate *private;
g_return_if_fail (GTK_IS_BOX (box));
private = box->priv;
if (private->baseline_pos != position)
{
private->baseline_pos = position;
g_object_notify_by_pspec (G_OBJECT (box), props[PROP_BASELINE_POSITION]);
gtk_widget_queue_resize (GTK_WIDGET (box));
}
}
/**
* gtk_box_get_baseline_position:
* @box: a #GtkBox
*
* Gets the value set by gtk_box_set_baseline_position().
*
* Returns: the baseline position
*
* Since: 3.10
**/
GtkBaselinePosition
gtk_box_get_baseline_position (GtkBox *box)
{
g_return_val_if_fail (GTK_IS_BOX (box), GTK_BASELINE_POSITION_CENTER);
return box->priv->baseline_pos;
}
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 contains 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_box_update_child_css_position (box, child_info);
gtk_container_child_notify_by_pspec (GTK_CONTAINER (box), child, child_props[CHILD_PROP_POSITION]);
if (_gtk_widget_get_visible (child) &&
_gtk_widget_get_visible (GTK_WIDGET (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 expand child
* property
* @fill: (out): pointer to return location for fill child
* property
* @padding: (out): pointer to return location for padding
* child property
* @pack_type: (out): pointer to return location for 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 expand child property
* @fill: the new value of the fill child property
* @padding: the new value of the padding child property
* @pack_type: the new value of the 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_container_child_notify_by_pspec (GTK_CONTAINER (box), child, child_props[CHILD_PROP_EXPAND]);
}
child_info->fill = fill != FALSE;
gtk_container_child_notify_by_pspec (GTK_CONTAINER (box), child, child_props[CHILD_PROP_FILL]);
child_info->padding = padding;
gtk_container_child_notify_by_pspec (GTK_CONTAINER (box), child, child_props[CHILD_PROP_PADDING]);
if (pack_type != GTK_PACK_END)
pack_type = GTK_PACK_START;
if (child_info->pack != pack_type)
{
child_info->pack = pack_type;
gtk_box_update_child_css_position (box, child_info);
gtk_container_child_notify_by_pspec (GTK_CONTAINER (box), child, child_props[CHILD_PROP_PACK_TYPE]);
}
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;
if (priv->center == child)
priv->center = NULL;
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_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 == priv->center)
continue;
if (child->pack == GTK_PACK_START)
(* callback) (child->widget, callback_data);
}
if (priv->center)
(* callback) (priv->center->widget, callback_data);
children = g_list_last (priv->children);
while (children)
{
child = children->data;
children = children->prev;
if (child == priv->center)
continue;
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);
}
/**
* gtk_box_set_center_widget:
* @box: a #GtkBox
* @widget: (allow-none): the widget to center
*
* Sets a center widget; that is a child widget that will be
* centered with respect to the full width of the box, even
* if the children at either side take up different amounts
* of space.
*
* Since: 3.12
*/
void
gtk_box_set_center_widget (GtkBox *box,
GtkWidget *widget)
{
GtkBoxPrivate *priv = box->priv;
GtkWidget *old_center = NULL;
g_return_if_fail (GTK_IS_BOX (box));
if (priv->center)
{
old_center = g_object_ref (priv->center->widget);
gtk_box_remove (GTK_CONTAINER (box), priv->center->widget);
priv->center = NULL;
}
if (widget)
priv->center = gtk_box_pack (box, widget, FALSE, TRUE, 0, GTK_PACK_START);
if (old_center)
g_object_unref (old_center);
}
/**
* gtk_box_get_center_widget:
* @box: a #GtkBox
*
* Retrieves the center widget of the box.
*
* Returns: (transfer none) (nullable): the center widget
* or %NULL in case no center widget is set.
*
* Since: 3.12
*/
GtkWidget *
gtk_box_get_center_widget (GtkBox *box)
{
GtkBoxPrivate *priv = box->priv;
g_return_val_if_fail (GTK_IS_BOX (box), NULL);
if (priv->center)
return priv->center->widget;
return NULL;
}
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