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gtk2/gtk/gtkbox.c
Matthias Clasen 700196f71e Update documentation for orientables 
Don't document these as abstract anymore, since they are now
instantiatable.
2010-06-03 01:18:42 -04:00

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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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
/**
* SECTION:gtkbox
* @Short_description: Base class for box containers
* @Title: GtkBox
* @See_also:i #GtkHBox, #GtkVBox, #GtkFrame, #GtkTable, #GtkLayout
*
* GtkBox is an widget which encapsulates functionality for a
* particular kind of container, one that organizes a variable number of
* widgets into a rectangular area. GtkBox has a number of derived
* classes, e.g. #GtkHBox and #GtkVBox.
*
* The rectangular area of a GtkBox is organized into either a single row
* or a single column of child widgets depending upon whether the box is
* of type #GtkHBox or #GtkVBox, respectively. Thus, all children of a
* GtkBox are allocated one dimension in common, which is the height of a
* row, or the width of a column.
*
* GtkBox uses a notion of <emphasis>packing</emphasis>. Packing
* refers to adding widgets with reference to a particular position in a
* #GtkContainer. For a GtkBox, there are two reference positions: the
* <emphasis>start</emphasis> and the <emphasis>end</emphasis> of the box.
* For a #GtkVBox, the start is defined as the top of the box and the end is
* defined as the bottom. For a #GtkHBox 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.
*
* Use gtk_box_pack_start_defaults() or gtk_box_pack_end_defaults()
* to pack widgets into a GtkBox if you do not need to specify the
* #GtkBox:expand, #GtkBox:fill, or #GtkBox:padding child properties
* for the child to be added.
*
* Because GtkBox is a #GtkContainer, you may also use
* gtk_container_add() to insert widgets into the box, and they will be
* packed as if with gtk_box_pack_start_defaults(). 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.
*
* Use gtk_box_reorder_child() to move a GtkBox child to a different
* place in the box.
*
* Use gtk_box_set_child_packing() to reset the #GtkBox:expand,
* #GtkBox:fill and #GtkBox:padding child properties.
* Use gtk_box_query_child_packing() to query these fields.
*/
#include "config.h"
#include "gtkbox.h"
#include "gtkorientable.h"
#include "gtkextendedlayout.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include "gtkalias.h"
enum {
PROP_0,
PROP_ORIENTATION,
PROP_SPACING,
PROP_HOMOGENEOUS
};
enum {
CHILD_PROP_0,
CHILD_PROP_EXPAND,
CHILD_PROP_FILL,
CHILD_PROP_PADDING,
CHILD_PROP_PACK_TYPE,
CHILD_PROP_POSITION
};
typedef struct _GtkBoxPrivate GtkBoxPrivate;
struct _GtkBoxPrivate
{
GtkOrientation orientation;
guint default_expand : 1;
guint spacing_set : 1;
};
#define GTK_BOX_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_BOX, GtkBoxPrivate))
typedef struct _GtkBoxDesiredSizes GtkBoxDesiredSizes;
typedef struct _GtkBoxSpreading GtkBoxSpreading;
struct _GtkBoxDesiredSizes
{
gint minimum_size;
gint natural_size;
};
struct _GtkBoxSpreading
{
GtkBoxChild *child;
gint index;
};
static void gtk_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
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 void gtk_box_extended_layout_init (GtkExtendedLayoutIface *iface);
static gboolean gtk_box_is_height_for_width (GtkExtendedLayout *layout);
static void gtk_box_get_desired_width (GtkExtendedLayout *layout,
gint *minimum_size,
gint *natural_size);
static void gtk_box_get_desired_height (GtkExtendedLayout *layout,
gint *minimum_size,
gint *natural_size);
static void gtk_box_get_width_for_height (GtkExtendedLayout *layout,
gint height,
gint *minimum_width,
gint *natural_width);
static void gtk_box_get_height_for_width (GtkExtendedLayout *layout,
gint width,
gint *minimum_height,
gint *natural_height);
static GtkExtendedLayoutIface *parent_extended_layout_iface;
G_DEFINE_TYPE_WITH_CODE (GtkBox, gtk_box, GTK_TYPE_CONTAINER,
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE,
NULL)
G_IMPLEMENT_INTERFACE (GTK_TYPE_EXTENDED_LAYOUT,
gtk_box_extended_layout_init));
static void
gtk_box_class_init (GtkBoxClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
GtkContainerClass *container_class = GTK_CONTAINER_CLASS (class);
object_class->set_property = gtk_box_set_property;
object_class->get_property = gtk_box_get_property;
widget_class->size_allocate = gtk_box_size_allocate;
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;
g_object_class_override_property (object_class,
PROP_ORIENTATION,
"orientation");
g_object_class_install_property (object_class,
PROP_SPACING,
g_param_spec_int ("spacing",
P_("Spacing"),
P_("The amount of space between children"),
0,
G_MAXINT,
0,
GTK_PARAM_READWRITE));
g_object_class_install_property (object_class,
PROP_HOMOGENEOUS,
g_param_spec_boolean ("homogeneous",
P_("Homogeneous"),
P_("Whether the children should all be the same size"),
FALSE,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class,
CHILD_PROP_EXPAND,
g_param_spec_boolean ("expand",
P_("Expand"),
P_("Whether the child should receive extra space when the parent grows"),
TRUE,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class,
CHILD_PROP_FILL,
g_param_spec_boolean ("fill",
P_("Fill"),
P_("Whether extra space given to the child should be allocated to the child or used as padding"),
TRUE,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class,
CHILD_PROP_PADDING,
g_param_spec_uint ("padding",
P_("Padding"),
P_("Extra space to put between the child and its neighbors, in pixels"),
0, G_MAXINT, 0,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class,
CHILD_PROP_PACK_TYPE,
g_param_spec_enum ("pack-type",
P_("Pack type"),
P_("A GtkPackType indicating whether the child is packed with reference to the start or end of the parent"),
GTK_TYPE_PACK_TYPE, GTK_PACK_START,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class,
CHILD_PROP_POSITION,
g_param_spec_int ("position",
P_("Position"),
P_("The index of the child in the parent"),
-1, G_MAXINT, 0,
GTK_PARAM_READWRITE));
g_type_class_add_private (object_class, sizeof (GtkBoxPrivate));
}
static void
gtk_box_init (GtkBox *box)
{
GtkBoxPrivate *private = GTK_BOX_GET_PRIVATE (box);
gtk_widget_set_has_window (GTK_WIDGET (box), FALSE);
gtk_widget_set_redraw_on_allocate (GTK_WIDGET (box), FALSE);
box->children = NULL;
box->spacing = 0;
box->homogeneous = FALSE;
private->orientation = GTK_ORIENTATION_HORIZONTAL;
private->default_expand = FALSE;
private->spacing_set = FALSE;
}
static void
gtk_box_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkBox *box = GTK_BOX (object);
GtkBoxPrivate *private = GTK_BOX_GET_PRIVATE (box);
switch (prop_id)
{
case PROP_ORIENTATION:
private->orientation = g_value_get_enum (value);
gtk_widget_queue_resize (GTK_WIDGET (box));
break;
case PROP_SPACING:
gtk_box_set_spacing (box, g_value_get_int (value));
break;
case PROP_HOMOGENEOUS:
gtk_box_set_homogeneous (box, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_box_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkBox *box = GTK_BOX (object);
GtkBoxPrivate *private = GTK_BOX_GET_PRIVATE (box);
switch (prop_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, private->orientation);
break;
case PROP_SPACING:
g_value_set_int (value, box->spacing);
break;
case PROP_HOMOGENEOUS:
g_value_set_boolean (value, box->homogeneous);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
count_expand_children (GtkBox *box, gint *visible_children, gint *expand_children)
{
GList *children;
GtkBoxChild *child;
*visible_children = *expand_children = 0;
for (children = box->children; children; children = children->next)
{
child = children->data;
if (gtk_widget_get_visible (child->widget))
{
*visible_children += 1;
if (child->expand)
*expand_children += 1;
}
}
}
static gint
gtk_box_compare_gap (gconstpointer p1,
gconstpointer p2,
gpointer data)
{
GtkBoxDesiredSizes *sizes = data;
const GtkBoxSpreading *c1 = p1;
const GtkBoxSpreading *c2 = p2;
const gint d1 = MAX (sizes[c1->index].natural_size -
sizes[c1->index].minimum_size,
0);
const gint d2 = MAX (sizes[c2->index].natural_size -
sizes[c2->index].minimum_size,
0);
gint delta = (d2 - d1);
if (0 == delta)
delta = (c2->index - c1->index);
return delta;
}
static void
gtk_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkBox *box = GTK_BOX (widget);
GtkBoxPrivate *private = GTK_BOX_GET_PRIVATE (box);
GtkBoxChild *child;
GList *children;
gint nvis_children;
gint nexpand_children;
widget->allocation = *allocation;
count_expand_children (box, &nvis_children, &nexpand_children);
if (nvis_children > 0)
{
gint border_width = GTK_CONTAINER (box)->border_width;
GtkTextDirection direction = gtk_widget_get_direction (widget);
GtkAllocation child_allocation;
GtkBoxSpreading *spreading = g_newa (GtkBoxSpreading, nvis_children);
GtkBoxDesiredSizes *sizes = g_newa (GtkBoxDesiredSizes, nvis_children);
GtkPackType packing;
gint size;
gint extra;
gint x = 0, y = 0, i;
gint child_size;
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
size = allocation->width - border_width * 2 - (nvis_children - 1) * box->spacing;
else
size = allocation->height - border_width * 2 - (nvis_children - 1) * box->spacing;
/* Retrieve desired size for visible children */
i = 0;
children = box->children;
while (children)
{
child = children->data;
children = children->next;
if (gtk_widget_get_visible (child->widget))
{
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_extended_layout_get_width_for_height (GTK_EXTENDED_LAYOUT (child->widget),
allocation->height,
&sizes[i].minimum_size,
&sizes[i].natural_size);
else
gtk_extended_layout_get_height_for_width (GTK_EXTENDED_LAYOUT (child->widget),
allocation->width,
&sizes[i].minimum_size,
&sizes[i].natural_size);
/* Assert the api is working properly */
if (sizes[i].minimum_size < 0)
g_error ("GtkBox child %s minimum %s: %d < 0 for %s %d",
gtk_widget_get_name (GTK_WIDGET (child->widget)),
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? "width" : "height",
sizes[i].minimum_size,
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? "height" : "width",
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? allocation->height : allocation->width);
if (sizes[i].natural_size < sizes[i].minimum_size)
g_error ("GtkBox child %s natural %s: %d < minimum %d for %s %d",
gtk_widget_get_name (GTK_WIDGET (child->widget)),
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? "width" : "height",
sizes[i].natural_size,
sizes[i].minimum_size,
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? "height" : "width",
(private->orientation == GTK_ORIENTATION_HORIZONTAL) ? allocation->height : allocation->width);
size -= sizes[i].minimum_size;
size -= child->padding * 2;
spreading[i].index = i;
spreading[i].child = child;
i += 1;
}
}
if (box->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 - border_width * 2 - (nvis_children - 1) * box->spacing;
else
size = allocation->height - border_width * 2 - (nvis_children - 1) * box->spacing;
extra = size / nvis_children;
}
else
{
/* Distribute the container's extra space c_gap. We want to assign
* this space such that the sum of extra space assigned to children
* (c^i_gap) is equal to c_cap. The case that there's not enough
* space for all children to take their natural size needs some
* attention. The goals we want to achieve are:
*
* a) Maximize number of children taking their natural size.
* b) The allocated size of children should be a continuous
* function of c_gap. That is, increasing the container size by
* one pixel should never make drastic changes in the distribution.
* c) If child i takes its natural size and child j doesn't,
* child j should have received at least as much gap as child i.
*
* The following code distributes the additional space by following
* this rules.
*/
/* Sort descending by gap and position. */
g_qsort_with_data (spreading,
nvis_children, sizeof (GtkBoxSpreading),
gtk_box_compare_gap, sizes);
/* Distribute available space.
* This master piece of a loop was conceived by Behdad Esfahbod.
*/
for (i = nvis_children - 1; i >= 0; --i)
{
/* Divide remaining space by number of remaining children.
* Sort order and reducing remaining space by assigned space
* ensures that space is distributed equally.
*/
gint glue = (size + i) / (i + 1);
gint gap = sizes[spreading[i].index].natural_size
- sizes[spreading[i].index].minimum_size;
extra = MIN (glue, gap);
sizes[spreading[i].index].minimum_size += extra;
size -= extra;
}
/* Calculate space which hasn't distributed yet,
* and is available for expanding children.
*/
if (nexpand_children > 0)
extra = size / nexpand_children;
else
extra = 0;
}
/* Allocate child positions. */
for (packing = GTK_PACK_START; packing <= GTK_PACK_END; ++packing)
{
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
{
child_allocation.y = allocation->y + border_width;
child_allocation.height = MAX (1, allocation->height - border_width * 2);
if (packing == GTK_PACK_START)
x = allocation->x + border_width;
else
x = allocation->x + allocation->width - border_width;
}
else
{
child_allocation.x = allocation->x + border_width;
child_allocation.width = MAX (1, allocation->width - border_width * 2);
if (packing == GTK_PACK_START)
y = allocation->y + border_width;
else
y = allocation->y + allocation->height - border_width;
}
i = 0;
children = box->children;
while (children)
{
child = children->data;
children = children->next;
if (gtk_widget_get_visible (child->widget))
{
if (child->pack == packing)
{
/* Assign the child's size. */
if (box->homogeneous)
{
if (nvis_children == 1)
child_size = size;
else
child_size = extra;
nvis_children -= 1;
size -= extra;
}
else
{
child_size = sizes[i].minimum_size + child->padding * 2;
if (child->expand)
{
if (nexpand_children == 1)
child_size += size;
else
child_size += extra;
nexpand_children -= 1;
size -= extra;
}
}
/* 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 + box->spacing;
}
else
{
x -= child_size + box->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 + box->spacing;
}
else
{
y -= child_size + box->spacing;
child_allocation.y -= child_size;
}
}
gtk_widget_size_allocate (child->widget, &child_allocation);
}
i += 1;
}
}
}
}
}
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 = 0;
gboolean fill = 0;
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)->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;
}
}
static void
gtk_box_pack (GtkBox *box,
GtkWidget *child,
gboolean expand,
gboolean fill,
guint padding,
GtkPackType pack_type)
{
GtkBoxChild *child_info;
g_return_if_fail (GTK_IS_BOX (box));
g_return_if_fail (GTK_IS_WIDGET (child));
g_return_if_fail (child->parent == 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;
child_info->is_secondary = FALSE;
box->children = g_list_append (box->children, child_info);
gtk_widget_freeze_child_notify (child);
gtk_widget_set_parent (child, GTK_WIDGET (box));
gtk_widget_child_notify (child, "expand");
gtk_widget_child_notify (child, "fill");
gtk_widget_child_notify (child, "padding");
gtk_widget_child_notify (child, "pack-type");
gtk_widget_child_notify (child, "position");
gtk_widget_thaw_child_notify (child);
}
static void
gtk_box_extended_layout_init (GtkExtendedLayoutIface *iface)
{
parent_extended_layout_iface = g_type_interface_peek_parent (iface);
iface->is_height_for_width = gtk_box_is_height_for_width;
iface->get_desired_width = gtk_box_get_desired_width;
iface->get_desired_height = gtk_box_get_desired_height;
iface->get_height_for_width = gtk_box_get_height_for_width;
iface->get_width_for_height = gtk_box_get_width_for_height;
}
static gboolean
gtk_box_is_height_for_width (GtkExtendedLayout *layout)
{
GtkBoxPrivate *private = GTK_BOX_GET_PRIVATE (layout);
return (private->orientation == GTK_ORIENTATION_VERTICAL);
}
static void
gtk_box_get_desired_size (GtkExtendedLayout *layout,
GtkOrientation orientation,
gint *minimum_size,
gint *natural_size)
{
GtkBox *box;
GtkBoxPrivate *private;
GList *children;
gint nvis_children;
gint border_width;
gint minimum, natural;
box = GTK_BOX (layout);
private = GTK_BOX_GET_PRIVATE (box);
border_width = GTK_CONTAINER (box)->border_width;
minimum = natural = 0;
nvis_children = 0;
for (children = box->children; children; children = children->next)
{
GtkBoxChild *child = children->data;
if (gtk_widget_get_visible (child->widget))
{
gint child_minimum, child_natural;
if (orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_extended_layout_get_desired_width (GTK_EXTENDED_LAYOUT (child->widget),
&child_minimum, &child_natural);
else
gtk_extended_layout_get_desired_height (GTK_EXTENDED_LAYOUT (child->widget),
&child_minimum, &child_natural);
if (private->orientation == orientation)
{
if (box->homogeneous)
{
gint largest;
largest = child_minimum + child->padding * 2;
minimum = MAX (minimum, largest);
largest = child_natural + child->padding * 2;
natural = MAX (natural, largest);
}
else
{
minimum += child_minimum + child->padding * 2;
natural += child_natural + child->padding * 2;
}
}
else
{
/* The biggest mins and naturals in the opposing orientation */
minimum = MAX (minimum, child_minimum);
natural = MAX (natural, child_natural);
}
nvis_children += 1;
}
}
if (nvis_children > 0 && private->orientation == orientation)
{
if (box->homogeneous)
{
minimum *= nvis_children;
natural *= nvis_children;
}
minimum += (nvis_children - 1) * box->spacing;
natural += (nvis_children - 1) * box->spacing;
}
minimum += border_width * 2;
natural += border_width * 2;
if (minimum_size)
*minimum_size = minimum;
if (natural_size)
*natural_size = natural;
}
static void
gtk_box_get_desired_width (GtkExtendedLayout *layout,
gint *minimum_size,
gint *natural_size)
{
gtk_box_get_desired_size (layout, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
}
static void
gtk_box_get_desired_height (GtkExtendedLayout *layout,
gint *minimum_size,
gint *natural_size)
{
gtk_box_get_desired_size (layout, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
}
static void
gtk_box_compute_size_for_opposing_orientation (GtkBox *box,
gint avail_size,
gint *minimum_size,
gint *natural_size)
{
GtkBoxPrivate *private = GTK_BOX_GET_PRIVATE (box);
GtkBoxChild *child;
GList *children;
gint nvis_children;
gint nexpand_children;
gint computed_minimum = 0, computed_natural = 0;
gint border_width = GTK_CONTAINER (box)->border_width;
count_expand_children (box, &nvis_children, &nexpand_children);
if (nvis_children > 0)
{
GtkBoxSpreading *spreading = g_newa (GtkBoxSpreading, nvis_children);
GtkBoxDesiredSizes *sizes = g_newa (GtkBoxDesiredSizes, nvis_children);
GtkPackType packing;
gint size;
gint extra, i;
gint child_size, child_minimum, child_natural;
size = avail_size - border_width * 2 - (nvis_children - 1) * box->spacing;
/* Retrieve desired size for visible children */
for (i = 0, children = box->children; children; children = children->next)
{
child = children->data;
if (gtk_widget_get_visible (child->widget))
{
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_extended_layout_get_desired_width (GTK_EXTENDED_LAYOUT (child->widget),
&sizes[i].minimum_size,
&sizes[i].natural_size);
else
gtk_extended_layout_get_desired_height (GTK_EXTENDED_LAYOUT (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;
spreading[i].index = i;
spreading[i].child = child;
i += 1;
}
}
if (box->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 - border_width * 2 - (nvis_children - 1) * box->spacing;
extra = size / nvis_children;
}
else
{
/* Distribute the container's extra space c_gap. We want to assign
* this space such that the sum of extra space assigned to children
* (c^i_gap) is equal to c_cap. The case that there's not enough
* space for all children to take their natural size needs some
* attention. The goals we want to achieve are:
*
* a) Maximize number of children taking their natural size.
* b) The allocated size of children should be a continuous
* function of c_gap. That is, increasing the container size by
* one pixel should never make drastic changes in the distribution.
* c) If child i takes its natural size and child j doesn't,
* child j should have received at least as much gap as child i.
*
* The following code distributes the additional space by following
* this rules.
*/
/* Sort descending by gap and position. */
g_qsort_with_data (spreading,
nvis_children, sizeof (GtkBoxSpreading),
gtk_box_compare_gap, sizes);
/* Distribute available space.
* This master piece of a loop was conceived by Behdad Esfahbod.
*/
for (i = nvis_children - 1; i >= 0; --i)
{
/* Divide remaining space by number of remaining children.
* Sort order and reducing remaining space by assigned space
* ensures that space is distributed equally.
*/
gint glue = (size + i) / (i + 1);
gint gap = sizes[spreading[i].index].natural_size
- sizes[spreading[i].index].minimum_size;
extra = MIN (glue, gap);
sizes[spreading[i].index].minimum_size += extra;
size -= extra;
}
/* Calculate space which hasn't distributed yet,
* and is available for expanding children.
*/
if (nexpand_children > 0)
extra = size / nexpand_children;
else
extra = 0;
}
/* Allocate child positions. */
for (packing = GTK_PACK_START; packing <= GTK_PACK_END; ++packing)
{
for (i = 0, children = box->children; children; children = children->next)
{
child = children->data;
if (gtk_widget_get_visible (child->widget))
{
if (child->pack == packing)
{
/* Assign the child's size. */
if (box->homogeneous)
{
if (nvis_children == 1)
child_size = size;
else
child_size = extra;
nvis_children -= 1;
size -= extra;
}
else
{
child_size = sizes[i].minimum_size + child->padding * 2;
if (child->expand)
{
if (nexpand_children == 1)
child_size += size;
else
child_size += extra;
nexpand_children -= 1;
size -= extra;
}
}
if (child->fill)
{
child_size = MAX (1, child_size - child->padding * 2);
}
else
{
child_size = sizes[i].minimum_size;
}
/* Assign the child's position. */
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_extended_layout_get_height_for_width (GTK_EXTENDED_LAYOUT (child->widget),
child_size, &child_minimum, &child_natural);
else /* (private->orientation == GTK_ORIENTATION_VERTICAL) */
gtk_extended_layout_get_width_for_height (GTK_EXTENDED_LAYOUT (child->widget),
child_size, &child_minimum, &child_natural);
computed_minimum = MAX (computed_minimum, child_minimum);
computed_natural = MAX (computed_natural, child_natural);
}
i += 1;
}
}
}
}
computed_minimum += border_width * 2;
computed_natural += border_width * 2;
if (minimum_size)
*minimum_size = computed_minimum;
if (natural_size)
*natural_size = computed_natural;
}
static void
gtk_box_compute_size_for_orientation (GtkBox *box,
gint avail_size,
gint *minimum_size,
gint *natural_size)
{
GtkBoxPrivate *private = GTK_BOX_GET_PRIVATE (box);
GList *children;
gint nvis_children = 0;
gint required_size = 0, required_natural = 0, child_size, child_natural;
gint largest_child = 0, largest_natural = 0;
avail_size -= GTK_CONTAINER (box)->border_width * 2;
for (children = box->children; children != NULL;
children = children->next, nvis_children++)
{
GtkBoxChild *child = children->data;
if (gtk_widget_get_visible (child->widget))
{
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_extended_layout_get_width_for_height (GTK_EXTENDED_LAYOUT (child->widget),
avail_size, &child_size, &child_natural);
else
gtk_extended_layout_get_height_for_width (GTK_EXTENDED_LAYOUT (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;
}
}
if (nvis_children > 0)
{
if (box->homogeneous)
{
required_size = largest_child * nvis_children;
required_natural = largest_natural * nvis_children;
}
required_size += (nvis_children - 1) * box->spacing;
required_natural += (nvis_children - 1) * box->spacing;
}
required_size += GTK_CONTAINER (box)->border_width * 2;
required_natural += GTK_CONTAINER (box)->border_width * 2;
if (minimum_size)
*minimum_size = required_size;
if (natural_size)
*natural_size = required_natural;
}
static void
gtk_box_get_width_for_height (GtkExtendedLayout *layout,
gint height,
gint *minimum_width,
gint *natural_width)
{
GtkBox *box = GTK_BOX (layout);
GtkBoxPrivate *private = GTK_BOX_GET_PRIVATE (layout);
if (private->orientation == GTK_ORIENTATION_VERTICAL)
gtk_box_compute_size_for_opposing_orientation (box, height, minimum_width, natural_width);
else
gtk_box_compute_size_for_orientation (box, height, minimum_width, natural_width);
}
static void
gtk_box_get_height_for_width (GtkExtendedLayout *layout,
gint width,
gint *minimum_height,
gint *natural_height)
{
GtkBox *box = GTK_BOX (layout);
GtkBoxPrivate *private = GTK_BOX_GET_PRIVATE (layout);
if (private->orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_box_compute_size_for_opposing_orientation (box, width, minimum_height, natural_height);
else
gtk_box_compute_size_for_orientation (box, width, minimum_height, natural_height);
}
/**
* gtk_box_new:
* @orientation: the box' orientation.
* @homogeneous: %TRUE if all children are to be given equal space allocations.
* @spacing: the number of pixels to place by default between children.
*
* Creates a new #GtkBox.
*
* Return value: a new #GtkBox.
*
* Since: 3.0
**/
GtkWidget*
gtk_box_new (GtkOrientation orientation,
gboolean homogeneous,
gint spacing)
{
return g_object_new (GTK_TYPE_BOX,
"orientation", orientation,
"spacing", spacing,
"homogeneous", homogeneous ? TRUE : FALSE,
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 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 #GtkHBox and the full width
* of a #GtkVBox. 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 #GtkHBox and the full width
* of a #GtkVBox. 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)
{
g_return_if_fail (GTK_IS_BOX (box));
if ((homogeneous ? TRUE : FALSE) != box->homogeneous)
{
box->homogeneous = homogeneous ? TRUE : FALSE;
g_object_notify (G_OBJECT (box), "homogeneous");
gtk_widget_queue_resize (GTK_WIDGET (box));
}
}
/**
* gtk_box_get_homogeneous:
* @box: a #GtkBox
*
* Returns whether the box is homogeneous (all children are the
* same size). See gtk_box_set_homogeneous().
*
* Return value: %TRUE if the box is homogeneous.
**/
gboolean
gtk_box_get_homogeneous (GtkBox *box)
{
g_return_val_if_fail (GTK_IS_BOX (box), FALSE);
return box->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)
{
g_return_if_fail (GTK_IS_BOX (box));
if (spacing != box->spacing)
{
box->spacing = spacing;
_gtk_box_set_spacing_set (box, TRUE);
g_object_notify (G_OBJECT (box), "spacing");
gtk_widget_queue_resize (GTK_WIDGET (box));
}
}
/**
* gtk_box_get_spacing:
* @box: a #GtkBox
*
* Gets the value set by gtk_box_set_spacing().
*
* Return value: spacing between children
**/
gint
gtk_box_get_spacing (GtkBox *box)
{
g_return_val_if_fail (GTK_IS_BOX (box), 0);
return box->spacing;
}
void
_gtk_box_set_spacing_set (GtkBox *box,
gboolean spacing_set)
{
GtkBoxPrivate *private;
g_return_if_fail (GTK_IS_BOX (box));
private = GTK_BOX_GET_PRIVATE (box);
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 = GTK_BOX_GET_PRIVATE (box);
return private->spacing_set;
}
/**
* gtk_box_reorder_child:
* @box: a #GtkBox
* @child: the #GtkWidget to move
* @position: the new position for @child in the list of children
* of @box, starting from 0. If negative, indicates the end of
* the list
*
* Moves @child to a new @position in the list of @box children.
* The list is the <structfield>children</structfield> field of
* #GtkBox-struct, and contains both widgets packed #GTK_PACK_START
* as well as widgets packed #GTK_PACK_END, in the order that these
* widgets were added to @box.
*
* A widget's position in the @box children list determines where
* the widget is packed into @box. A child widget at some position
* in the list will be packed just after all other widgets of the
* same packing type that appear earlier in the list.
*/
void
gtk_box_reorder_child (GtkBox *box,
GtkWidget *child,
gint position)
{
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));
old_link = box->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;
box->children = g_list_delete_link (box->children, old_link);
if (position < 0)
new_link = NULL;
else
new_link = g_list_nth (box->children, position);
box->children = g_list_insert_before (box->children, new_link, child_info);
gtk_widget_child_notify (child, "position");
if (gtk_widget_get_visible (child)
&& gtk_widget_get_visible (GTK_WIDGET (box)))
gtk_widget_queue_resize (child);
}
/**
* gtk_box_query_child_packing:
* @box: a #GtkBox
* @child: the #GtkWidget of the child to query
* @expand: pointer to return location for #GtkBox:expand child property
* @fill: pointer to return location for #GtkBox:fill child property
* @padding: pointer to return location for #GtkBox:padding child property
* @pack_type: pointer to return location for #GtkBox:pack-type child property
*
* Obtains information about how @child is packed into @box.
*/
void
gtk_box_query_child_packing (GtkBox *box,
GtkWidget *child,
gboolean *expand,
gboolean *fill,
guint *padding,
GtkPackType *pack_type)
{
GList *list;
GtkBoxChild *child_info = NULL;
g_return_if_fail (GTK_IS_BOX (box));
g_return_if_fail (GTK_IS_WIDGET (child));
list = box->children;
while (list)
{
child_info = list->data;
if (child_info->widget == child)
break;
list = list->next;
}
if (list)
{
if (expand)
*expand = child_info->expand;
if (fill)
*fill = child_info->fill;
if (padding)
*padding = child_info->padding;
if (pack_type)
*pack_type = child_info->pack;
}
}
/**
* gtk_box_set_child_packing:
* @box: a #GtkBox
* @child: the #GtkWidget of the child to set
* @expand: the new value of the #GtkBox:expand child property
* @fill: the new value of the #GtkBox:fill child property
* @padding: the new value of the #GtkBox:padding child property
* @pack_type: the new value of the #GtkBox:pack-type child property
*
* Sets the way @child is packed into @box.
*/
void
gtk_box_set_child_packing (GtkBox *box,
GtkWidget *child,
gboolean expand,
gboolean fill,
guint padding,
GtkPackType pack_type)
{
GList *list;
GtkBoxChild *child_info = NULL;
g_return_if_fail (GTK_IS_BOX (box));
g_return_if_fail (GTK_IS_WIDGET (child));
list = box->children;
while (list)
{
child_info = list->data;
if (child_info->widget == child)
break;
list = list->next;
}
gtk_widget_freeze_child_notify (child);
if (list)
{
child_info->expand = expand != FALSE;
gtk_widget_child_notify (child, "expand");
child_info->fill = fill != FALSE;
gtk_widget_child_notify (child, "fill");
child_info->padding = padding;
gtk_widget_child_notify (child, "padding");
if (pack_type == GTK_PACK_END)
child_info->pack = GTK_PACK_END;
else
child_info->pack = GTK_PACK_START;
gtk_widget_child_notify (child, "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 = GTK_BOX_GET_PRIVATE (box);
private->default_expand = TRUE;
}
static void
gtk_box_add (GtkContainer *container,
GtkWidget *widget)
{
GtkBoxPrivate *private = GTK_BOX_GET_PRIVATE (container);
gtk_box_pack_start (GTK_BOX (container), widget,
private->default_expand,
private->default_expand,
0);
}
static void
gtk_box_remove (GtkContainer *container,
GtkWidget *widget)
{
GtkBox *box = GTK_BOX (container);
GtkBoxChild *child;
GList *children;
children = box->children;
while (children)
{
child = children->data;
if (child->widget == widget)
{
gboolean was_visible;
was_visible = gtk_widget_get_visible (widget);
gtk_widget_unparent (widget);
box->children = g_list_remove_link (box->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);
GtkBoxChild *child;
GList *children;
children = box->children;
while (children)
{
child = children->data;
children = children->next;
if (child->pack == GTK_PACK_START)
(* callback) (child->widget, callback_data);
}
children = g_list_last (box->children);
while (children)
{
child = children->data;
children = children->prev;
if (child->pack == GTK_PACK_END)
(* callback) (child->widget, callback_data);
}
}
#define __GTK_BOX_C__
#include "gtkaliasdef.c"
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