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GTK+ Reference Manual | |
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#include <gtk/gtk.h>
GtkBox;
GtkBoxChild;
void gtk_box_pack_start (GtkBox *box,
GtkWidget *child,
gboolean expand,
gboolean fill,
guint padding);
void gtk_box_pack_end (GtkBox *box,
GtkWidget *child,
gboolean expand,
gboolean fill,
guint padding);
void gtk_box_pack_start_defaults (GtkBox *box,
GtkWidget *widget);
void gtk_box_pack_end_defaults (GtkBox *box,
GtkWidget *widget);
gboolean gtk_box_get_homogeneous (GtkBox *box);
void gtk_box_set_homogeneous (GtkBox *box,
gboolean homogeneous);
gint gtk_box_get_spacing (GtkBox *box);
void gtk_box_set_spacing (GtkBox *box,
gint spacing);
void gtk_box_reorder_child (GtkBox *box,
GtkWidget *child,
gint position);
void gtk_box_query_child_packing (GtkBox *box,
GtkWidget *child,
gboolean *expand,
gboolean *fill,
guint *padding,
GtkPackType *pack_type);
void gtk_box_set_child_packing (GtkBox *box,
GtkWidget *child,
gboolean expand,
gboolean fill,
guint padding,
GtkPackType pack_type);
GObject +----GInitiallyUnowned +----GtkObject +----GtkWidget +----GtkContainer +----GtkBox +----GtkButtonBox +----GtkVBox +----GtkHBox
"expand" gboolean : Read / Write "fill" gboolean : Read / Write "pack-type" GtkPackType : Read / Write "padding" guint : Read / Write "position" gint : Read / Write
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 currently has two derived classes, 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.
typedef struct {
GList *children;
gint16 spacing;
guint homogeneous : 1;
} GtkBox;
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.)
GList *children; |
a list of children belonging the GtkBox. The data is a list of structures of type GtkBoxChild. |
gint16 spacing; |
the number of pixels to put between children of the GtkBox,
zero by default. Use gtk_box_set_spacing() to set this field.
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guint homogeneous : 1; |
a flag that if TRUE forces all children to get equal
space in the GtkBox; FALSE by default. Use gtk_box_set_homogeneous()
to set this field.
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typedef struct {
GtkWidget *widget;
guint16 padding;
guint expand : 1;
guint fill : 1;
guint pack : 1;
guint is_secondary : 1;
} GtkBoxChild;
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.)
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.
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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.
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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
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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.
box : |
a GtkBox |
child : |
the GtkWidget to be added to box
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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
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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
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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
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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.
box : |
a GtkBox |
child : |
the GtkWidget to be added to box
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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
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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
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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
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void gtk_box_pack_start_defaults (GtkBox *box, GtkWidget *widget);
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.
void gtk_box_pack_end_defaults (GtkBox *box, GtkWidget *widget);
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.
gboolean gtk_box_get_homogeneous (GtkBox *box);
Returns whether the box is homogeneous (all children are the
same size). See 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.
gint gtk_box_get_spacing (GtkBox *box);
Gets the value set by gtk_box_set_spacing().
box : |
a GtkBox |
| Returns : | spacing between children |
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.
box : |
a GtkBox |
spacing : |
the number of pixels to put between children |
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.
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.
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 |
"homogeneous" property"homogeneous" gboolean : Read / Write
Whether the children should all be the same size.
Default value: FALSE
"spacing" property"spacing" gint : Read / Write
The amount of space between children.
Allowed values: >= 0
Default value: 0
"expand" child property"expand" gboolean : Read / Write
Whether the child should receive extra space when the parent grows.
Default value: TRUE
"fill" child property"fill" gboolean : Read / Write
Whether extra space given to the child should be allocated to the child or used as padding.
Default value: TRUE
"pack-type" child property"pack-type" GtkPackType : Read / Write
A GtkPackType indicating whether the child is packed with reference to the start or end of the parent.
Default value: GTK_PACK_START
"padding" child property"padding" guint : Read / Write
Extra space to put between the child and its neighbors, in pixels.
Allowed values: <= G_MAXINT
Default value: 0
"position" child property"position" gint : Read / Write
The index of the child in the parent.
Allowed values: >= -1
Default value: 0
| 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. |