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GtkBox

GtkBox — Base class for box containers

Properties

gboolean homogeneous Read / Write
gint spacing Read / Write

Child Properties

gboolean expand Read / Write
gboolean fill Read / Write
GtkPackType pack-type Read / Write
guint padding Read / Write
gint position Read / Write

Types and Values

struct GtkBox
struct GtkBoxChild

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GtkObject
            ╰── GtkWidget
                ╰── GtkContainer
                    ╰── GtkBox
                        ├── GtkButtonBox
                        ├── GtkVBox
                        ╰── GtkHBox

Implemented Interfaces

GtkBox implements AtkImplementorIface, GtkBuildable and GtkOrientable.

Includes

#include <gtk/gtk.h>

Description

GtkBox is an abstract 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 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 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 “expand”, “fill”, or “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 “expand”, “fill” and “padding” child properties. Use gtk_box_query_child_packing() to query these fields.

Functions

gtk_box_pack_start ()

void
gtk_box_pack_start (GtkBox *box,
                    GtkWidget *child,
                    gboolean expand,
                    gboolean fill,
                    guint padding);

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 .

Parameters

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 “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

 

gtk_box_pack_end ()

void
gtk_box_pack_end (GtkBox *box,
                  GtkWidget *child,
                  gboolean expand,
                  gboolean fill,
                  guint padding);

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 .

Parameters

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 “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

 

gtk_box_pack_start_defaults ()

void
gtk_box_pack_start_defaults (GtkBox *box,
                             GtkWidget *widget);

gtk_box_pack_start_defaults has been deprecated since version 2.14 and should not be used in newly-written code.

Use gtk_box_pack_start()

Adds widget 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 .

Parameters for how to pack the child widget , “expand”, “fill” and “padding”, are given their default values, TRUE, TRUE, and 0, respectively.

Parameters

box

a GtkBox

 

widget

the GtkWidget to be added to box

 

gtk_box_pack_end_defaults ()

void
gtk_box_pack_end_defaults (GtkBox *box,
                           GtkWidget *widget);

gtk_box_pack_end_defaults has been deprecated since version 2.14 and should not be used in newly-written code.

Use gtk_box_pack_end()

Adds widget to box , packed with reference to the end of box . The child is packed after any other child packed with reference to the start of box .

Parameters for how to pack the child widget , “expand”, “fill” and “padding”, are given their default values, TRUE, TRUE, and 0, respectively.

Parameters

box

a GtkBox

 

widget

the GtkWidget to be added to box

 

gtk_box_get_homogeneous ()

gboolean
gtk_box_get_homogeneous (GtkBox *box);

Returns whether the box is homogeneous (all children are the same size). See gtk_box_set_homogeneous().

Parameters

box

a GtkBox

 

Returns

TRUE if the box is homogeneous.


gtk_box_set_homogeneous ()

void
gtk_box_set_homogeneous (GtkBox *box,
                         gboolean homogeneous);

Sets the “homogeneous” property of box , controlling whether or not all children of box are given equal space in the box.

Parameters

box

a GtkBox

 

homogeneous

a boolean value, TRUE to create equal allotments, FALSE for variable allotments

 

gtk_box_get_spacing ()

gint
gtk_box_get_spacing (GtkBox *box);

Gets the value set by gtk_box_set_spacing().

Parameters

box

a GtkBox

 

Returns

spacing between children


gtk_box_set_spacing ()

void
gtk_box_set_spacing (GtkBox *box,
                     gint spacing);

Sets the “spacing” property of box , which is the number of pixels to place between children of box .

Parameters

box

a GtkBox

 

spacing

the number of pixels to put between children

 

gtk_box_reorder_child ()

void
gtk_box_reorder_child (GtkBox *box,
                       GtkWidget *child,
                       gint position);

Moves child to a new position in the list of box children. The list is the children field of GtkBox, 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.

Parameters

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

 

gtk_box_query_child_packing ()

void
gtk_box_query_child_packing (GtkBox *box,
                             GtkWidget *child,
                             gboolean *expand,
                             gboolean *fill,
                             guint *padding,
                             GtkPackType *pack_type);

Obtains information about how child is packed into box .

Parameters

box

a GtkBox

 

child

the GtkWidget of the child to query

 

expand

pointer to return location for “expand” child property

 

fill

pointer to return location for “fill” child property

 

padding

pointer to return location for “padding” child property

 

pack_type

pointer to return location for “pack-type” child property

 

gtk_box_set_child_packing ()

void
gtk_box_set_child_packing (GtkBox *box,
                           GtkWidget *child,
                           gboolean expand,
                           gboolean fill,
                           guint padding,
                           GtkPackType pack_type);

Sets the way child is packed into box .

Parameters

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

 

Types and Values

struct GtkBox

struct GtkBox {
  GList *GSEAL (children);
  gint16 GSEAL (spacing);
  guint GSEAL (homogeneous) : 1;
};

The GtkBox describes an instance of GtkBox and contains the following fields. (These fields should be considered read-only. They should never be set by an application.)


struct GtkBoxChild

struct GtkBoxChild {
  GtkWidget *widget;
  guint16 padding;
  guint expand : 1;
  guint fill : 1;
  guint pack : 1;
  guint is_secondary : 1;
};

GtkBoxChild has been deprecated since version 2.22 and should not be used in newly-written code.

Use gtk_container_get_children() instead.

The GtkBoxChild holds a child widget of GtkBox and describes how the child is to be packed into the GtkBox. All fields of this GtkBoxChild should be considered read-only and they should never be set directly by an application. Use gtk_box_query_child_packing() and gtk_box_set_child_packing() to query and set the GtkBoxChild.padding, GtkBoxChild.expand, GtkBoxChild.fill and GtkBoxChild.pack fields.

The GtkBoxChild holds a child widget of GtkBox and describes how the child is to be packed into the GtkBox. Use gtk_box_query_child_packing() and gtk_box_set_child_packing() to query and reset the padding, expand, fill, and pack fields.

GtkBoxChild contains the following fields. (These fields should be considered read-only. They should never be directly set by an application.)

Members

GtkWidget *widget;

the child widget, packed into the GtkBox.

 

guint16 padding;

the number of extra pixels to put between this child and its neighbors, set when packed, zero by default.

 

guint expand : 1;

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.

 

guint fill : 1;

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.

 

guint pack : 1;

one of GtkPackType indicating whether the child is packed with reference to the start (top/left) or end (bottom/right) of the GtkBox.

 

guint is_secondary : 1;

TRUE if the child is secondary

 

Property Details

The “homogeneous” property

  “homogeneous”              gboolean

Whether the children should all be the same size.

Flags: Read / Write

Default value: FALSE


The “spacing” property

  “spacing”                  gint

The amount of space between children.

Flags: Read / Write

Allowed values: >= 0

Default value: 0

Child Property Details

The “expand” child property

  “expand”                   gboolean

Whether the child should receive extra space when the parent grows.

Flags: Read / Write

Default value: TRUE


The “fill” child property

  “fill”                     gboolean

Whether extra space given to the child should be allocated to the child or used as padding.

Flags: Read / Write

Default value: TRUE


The “pack-type” child property

  “pack-type”                GtkPackType

A GtkPackType indicating whether the child is packed with reference to the start or end of the parent.

Flags: Read / Write

Default value: GTK_PACK_START


The “padding” child property

  “padding”                  guint

Extra space to put between the child and its neighbors, in pixels.

Flags: Read / Write

Allowed values: <= G_MAXINT

Default value: 0


The “position” child property

  “position”                 gint

The index of the child in the parent.

Flags: Read / Write

Allowed values: >= -1

Default value: 0

See Also

GtkHBox

a derived class that organizes widgets into a row.

GtkVBox

a derived class that organizes widgets into a column.

GtkFrame

a GtkWidget useful for drawing a border around a GtkBox.

GtkTable

a GtkContainer for organizing widgets into a grid, rather than independent rows or columns.

GtkLayout

a GtkContainer for organizing widgets into arbitrary layouts.

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