gtkbox.sgml

This GTK+ version 2.12.3. GTK+ is a multi-platform toolkit for creating graphical user interfaces.

<!-- ##### SECTION Title ##### -->
GtkBox

<!-- ##### SECTION Short_Description ##### -->
Base class for box containers

<!-- ##### SECTION Long_Description ##### -->
<para>
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.
</para>
<para>
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.
</para>
<para>
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.
</para>
<para>
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.
</para>
<para>
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.
</para>
<para>
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.
</para>
<para>
Use gtk_box_set_homogeneous() to specify whether or not all children
of the GtkBox are forced to get the same amount of space.
</para>
<para>
Use gtk_box_set_spacing() to determine how much space will be
minimally placed between all children in the GtkBox.
</para>
<para>
Use gtk_box_reorder_child() to move a GtkBox child to a different
place in the box.
</para>
<para>
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.
</para>

<!-- ##### SECTION See_Also ##### -->
<para>
<variablelist>

<varlistentry>
<term>#GtkHBox</term>
<listitem><para>a derived class that organizes widgets into a row.</para></listitem>
</varlistentry>

<varlistentry>
<term>#GtkVBox</term>
<listitem><para>a derived class that organizes widgets into a column.</para></listitem>
</varlistentry>

<varlistentry>
<term>#GtkFrame</term>
<listitem><para>a #GtkWidget useful for drawing a border around a GtkBox.</para></listitem>
</varlistentry>

<varlistentry>
<term>#GtkTable</term>
<listitem><para>a #GtkContainer for organizing widgets into a grid,
rather than independent rows or columns.</para></listitem>
</varlistentry>

<varlistentry>
<term>#GtkLayout</term>
<listitem><para>a #GtkContainer for organizing widgets into arbitrary
layouts.</para></listitem>
</varlistentry>

</variablelist>

</para>

<!-- ##### SECTION Stability_Level ##### -->


<!-- ##### STRUCT GtkBox ##### -->
<para>
The #GtkBox-struct 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.)
</para>

@children: a list of children belonging the GtkBox.  
  The data is a list of structures of type #GtkBoxChild-struct.
@spacing: the number of pixels to put between children of the GtkBox, 
  zero by default. Use gtk_box_set_spacing() to set this field.
@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.

<!-- ##### ARG GtkBox:homogeneous ##### -->
<para>

</para>

<!-- ##### ARG GtkBox:spacing ##### -->
<para>

</para>

<!-- ##### ARG GtkBox:expand ##### -->
<para>

</para>

<!-- ##### ARG GtkBox:fill ##### -->
<para>

</para>

<!-- ##### ARG GtkBox:pack-type ##### -->
<para>

</para>

<!-- ##### ARG GtkBox:padding ##### -->
<para>

</para>

<!-- ##### ARG GtkBox:position ##### -->
<para>

</para>

<!-- ##### STRUCT GtkBoxChild ##### -->
<para>
The #GtkBoxChild-struct 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 <structfield>padding</structfield>,
<structfield>expand</structfield>, <structfield>fill</structfield>,
and <structfield>pack</structfield> fields.
</para>
<para>
#GtkBoxChild-struct contains the following fields.  (These fields
should be considered read-only. They should never be directly set by an
application.)
</para>

@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.
@is_secondary: %TRUE if the child is secondary

<!-- ##### FUNCTION gtk_box_pack_start ##### -->
<para>

</para>

@box: 
@child: 
@expand: 
@box
@fill: 
@padding: 


<!-- ##### FUNCTION gtk_box_pack_end ##### -->
<para>

</para>

@box: 
@child: 
@expand: 
@fill: 
@padding: 


<!-- ##### FUNCTION gtk_box_pack_start_defaults ##### -->
<para>

</para>

@box: 
@widget: 


<!-- ##### FUNCTION gtk_box_pack_end_defaults ##### -->
<para>

</para>

@box: 
@widget: 


<!-- ##### FUNCTION gtk_box_get_homogeneous ##### -->
<para>

</para>

@box: 
@Returns: 


<!-- ##### FUNCTION gtk_box_set_homogeneous ##### -->
<para>

</para>

@box: 
@homogeneous: 


<!-- ##### FUNCTION gtk_box_get_spacing ##### -->
<para>

</para>

@box: 
@Returns: 


<!-- ##### FUNCTION gtk_box_set_spacing ##### -->
<para>

</para>

@box: 
@spacing: 


<!-- ##### FUNCTION gtk_box_reorder_child ##### -->
<para>

</para>

@box: 
@child: 
@position: 


<!-- ##### FUNCTION gtk_box_query_child_packing ##### -->
<para>

</para>

@box: 
@child: 
@expand: 
@fill: 
@padding: 
@pack_type: 


<!-- ##### FUNCTION gtk_box_set_child_packing ##### -->
<para>

</para>

@box: 
@child: 
@expand: 
@fill: 
@padding: 
@pack_type: