<!-- ##### SECTION Title ##### -->
GtkSizeGroup

<!-- ##### SECTION Short_Description ##### -->
Grouping widgets so they request the same size

<!-- ##### SECTION Long_Description ##### -->
<para>
#GtkSizeGroup provides a mechanism for grouping a number of widgets
together so they all request the same amount of space.  This is
typically useful when you want a column of widgets to have the same
size, but you can't use a #GtkTable widget.
</para>
<para>
In detail, the size requested for each widget in a #GtkSizeGroup is
the maximum of the sizes that would have been requested for each
widget in the size group if they were not in the size group. The mode
of the size group (see gtk_size_group_set_mode()) determines whether
this applies to the horizontal size, the vertical size, or both sizes.
</para>
<para>
Note that size groups only affect the amount of space requested, not
the size that the widgets finally receive. If you want the widgets in
a #GtkSizeGroup to actually be the same size, you need to pack them in
such a way that they get the size they request and not more. For
example, if you are packing your widgets into a table, you would not
include the %GTK_FILL flag.
</para>
<para>
#GtkSizeGroup objects are referenced by each widget in the size group,
so once you have added all widgets to a #GtkSizeGroup, you can drop
the initial reference to the size group with g_object_unref(). If the
widgets in the size group are subsequently destroyed, then they will
be removed from the size group and drop their references on the size
group; when all widgets have been removed, the size group will be
freed.
</para>
<para>
Widgets can be part of multiple size groups; GTK+ will compute the
horizontal size of a widget from the horizontal requisition of all
widgets that can be reached from the widget by a chain of size groups
of type %GTK_SIZE_GROUP_HORIZONTAL or %GTK_SIZE_GROUP_BOTH, and the
vertical size from the vertical requisition of all widgets that can be
reached from the widget by a chain of size groups of type
%GTK_SIZE_GROUP_VERTICAL or %GTK_SIZE_GROUP_BOTH.
</para>
<para>
Note that only non-contextual sizes of every widget are ever consulted
by size groups (since size groups have no knowledge of what size a widget
will be allocated in one dimension, it cannot derive how much height
a widget will receive for a given width). When grouping widgets that
trade height for width in mode %GTK_SIZE_GROUP_VERTICAL or %GTK_SIZE_GROUP_BOTH: 
the height for the minimum width will be the requested height for all 
widgets in the group. The same is of course true when horizontally grouping
width for height widgets.
</para>
<para>
Widgets that trade height-for-width should set a reasonably large minimum width
by way of GtkLabel:width-chars for instance. Widgets with static sizes as well 
as widgets that grow (such as ellipsizing text) need no such considerations.
</para>
<refsect2 id="GtkSizeGroup-BUILDER-UI">
<title>GtkSizeGroup as GtkBuildable</title>
<para>
Size groups can be specified in a UI definition by placing an
&lt;object&gt; element with <literal>class="GtkSizeGroup"</literal>
somewhere in the UI definition. The widgets that belong to the
size group are specified by a &lt;widgets&gt; element that may
contain multiple &lt;widget&gt; elements, one for each member
of the size group. The name attribute gives the id of the widget.
</para>
<example>
<title>A UI definition fragment with GtkSizeGroup</title>
<programlisting><![CDATA[
<object class="GtkSizeGroup">
  <property name="mode">GTK_SIZE_GROUP_HORIZONTAL</property>
  <widgets>
    <widget name="radio1"/>
    <widget name="radio2"/>
  </widgets>
</object>
]]></programlisting>
</example>
</refsect2>

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<para>

</para>

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


<!-- ##### SECTION Image ##### -->


<!-- ##### STRUCT GtkSizeGroup ##### -->
<para>

</para>


<!-- ##### ARG GtkSizeGroup:ignore-hidden ##### -->
<para>

</para>

<!-- ##### ARG GtkSizeGroup:mode ##### -->
<para>

</para>

<!-- ##### ENUM GtkSizeGroupMode ##### -->
<para>

</para>

@GTK_SIZE_GROUP_NONE: 
@GTK_SIZE_GROUP_HORIZONTAL: 
@GTK_SIZE_GROUP_VERTICAL: 
@GTK_SIZE_GROUP_BOTH: 

<!-- ##### FUNCTION gtk_size_group_new ##### -->
<para>

</para>

@mode: 
@Returns: 


<!-- ##### FUNCTION gtk_size_group_set_mode ##### -->
<para>

</para>

@size_group: 
@mode: 


<!-- ##### FUNCTION gtk_size_group_get_mode ##### -->
<para>

</para>

@size_group: 
@Returns: 


<!-- ##### FUNCTION gtk_size_group_set_ignore_hidden ##### -->
<para>

</para>

@size_group: 
@ignore_hidden: 


<!-- ##### FUNCTION gtk_size_group_get_ignore_hidden ##### -->
<para>

</para>

@size_group: 
@Returns: 


<!-- ##### FUNCTION gtk_size_group_add_widget ##### -->
<para>

</para>

@size_group: 
@widget: 


<!-- ##### FUNCTION gtk_size_group_remove_widget ##### -->
<para>

</para>

@size_group: 
@widget: 


<!-- ##### FUNCTION gtk_size_group_get_widgets ##### -->
<para>

</para>

@size_group: 
@Returns: 


