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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 functionallity 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 attributes of 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 attributes of any GtkBox child.
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. |
guint homogeneous; |
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. |
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; |
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; |
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; |
one of GtkPackType indicating whether the child is packed with reference to the start (top/left) or end (bottom/right) of the GtkBox. |
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.
|
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 in GtkBox. 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.
|
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.
|
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 in GtkBox. 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.
|
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 in GtkBoxChild, 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 (away from end of) any other child packed with
reference to the end of box.
Parameters for how to pack the child widget,
expand, fill,
and padding in GtkBoxChild, 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().
box : |
a GtkBox |
| Returns : | TRUE if the box is homogeneous.
|
void gtk_box_set_homogeneous (GtkBox *box, gboolean homogeneous);
Sets the homogeneous field of
GtkBox, controlling whether or not all children of box are
given equal space in the box.
box : |
a GtkBox. |
homogeneous : |
a boolean value, TRUE to create equal allotments,
FALSE for variable allotments.
|
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 field of GtkBox,
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);
Returns information about how child is packed into box.
box : |
a GtkBox. |
child : |
the GtkWidget of the child to query. |
expand : |
the returned value of the expand
field in GtkBoxChild.
|
fill : |
the returned value of the fill field
in GtkBoxChild.
|
padding : |
the returned value of the padding
field in GtkBoxChild.
|
pack_type : |
the returned value of the pack
field in GtkBoxChild.
|
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.
homogeneous" property"homogeneous" gboolean : Read / Write
Whether the children should all be the same size.
Default value: FALSE
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
| 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. |