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gtk2/gtk/gtkbox.c
Benjamin Otte bbb70857be gtk: Remove all gtk_widget_set_redraw_on_allocate() calls 
They're either wrong (when using FALSE because the widgets don't account
for changes to the CSS) or unnecessary (when using TRUE because it's the
default).

Fixes !1777
2019-03-27 00:02:34 +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 for packing widgets in a single row or column
* @Title: GtkBox
* @See_also: #GtkGrid
*
* The GtkBox widget arranges child widgets into a single row or column,
* depending upon the value of its #GtkOrientable:orientation property. Within
* the other dimension, all children are allocated the same size. Of course,
* the #GtkWidget:halign and #GtkWidget:valign properties can be used on
* the children to influence their allocation.
*
* 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.
*
* # 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: The #GtkWidget:hexpand or #GtkWidget:vexpand properties are the
* preferred way to influence whether the child receives extra space, by
* setting the child’s expand property corresponding to the box’s orientation.
*
* 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 fill extra space or use it as padding.
*
* Note: The #GtkWidget:halign or #GtkWidget:valign properties are the
* preferred way to influence whether the child fills available space, by
* setting the child’s align property corresponding to the box’s orientation
* to %GTK_ALIGN_FILL to fill, or to something else to refrain from filling.
*/
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);
/**
* GtkBox:padding:
*
* Extra space to put between the child and its neighbors, in pixels.
*
* Note: The CSS padding properties are the preferred way to add space among
* widgets, by setting the paddings corresponding to the box’s orientation.
*/
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);
memset (sizes, 0, nvis_children * sizeof (GtkRequestedSize));
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 = {0, 0};
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] = nvis[0] ? ((box_size - center_size) / 2 - nvis[0] * priv->spacing) / nvis[0] : 0;
extra[1] = nvis[1] ? ((box_size - center_size) / 2 - nvis[1] * priv->spacing) / nvis[1] : 0;
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 && direction == GTK_TEXT_DIR_LTR) ||
(packing == GTK_PACK_END && direction == GTK_TEXT_DIR_RTL))
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 && direction == GTK_TEXT_DIR_LTR) ||
(packing == GTK_PACK_END && direction == GTK_TEXT_DIR_RTL))
{
x += child_size + priv->spacing;
}
else
{
x -= child_size + priv->spacing;
child_allocation.x -= child_size;
}
}
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 (priv->orientation == GTK_ORIENTATION_HORIZONTAL &&
direction == GTK_TEXT_DIR_RTL)
packing = GTK_PACK_END;
else
packing = GTK_PACK_START;
if (center_pos < side[packing])
center_pos = side[packing];
else if (center_pos + center_size > side[1 - packing])
center_pos = side[1 - packing] - 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));
if (expand)
gtk_container_child_notify_by_pspec (container, child, child_props[CHILD_PROP_EXPAND]);
if (!fill)
gtk_container_child_notify_by_pspec (container, child, child_props[CHILD_PROP_FILL]);
if (padding != 0)
gtk_container_child_notify_by_pspec (container, child, child_props[CHILD_PROP_PADDING]);
if (pack_type != GTK_PACK_START)
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);
memset (sizes, 0, nvis_children * sizeof (GtkRequestedSize));
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);
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)
{
expand = expand != FALSE;
if (child_info->expand != expand)
{
child_info->expand = expand;
gtk_container_child_notify_by_pspec (GTK_CONTAINER (box), child, child_props[CHILD_PROP_EXPAND]);
}
fill = fill != FALSE;
if (child_info->fill != fill)
{
child_info->fill = fill;
gtk_container_child_notify_by_pspec (GTK_CONTAINER (box), child, child_props[CHILD_PROP_FILL]);
}
if (child_info->padding != padding)
{
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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