gtk2/docs/reference/gtk/tmpl/gtkuimanager.sgml

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GtkUIManager

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constructing menus and toolbars from an XML description

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<para>
A #GtkUIManager constructs a user interface (menus and toolbars) from
one or more UI definitions, which reference actions from one or more 
action groups. 
</para>
<refsect2 id="XML-UI"><title>UI Definitions</title>
<para>
The UI definitions are specified in an XML format which can be
roughly described by the following DTD. 
<programlisting>
&lt;!ELEMENT ui          (menubar|toolbar|popup)* &gt;
&lt;!ELEMENT menubar     (menuitem|separator|placeholder|menu)* &gt;
&lt;!ELEMENT menu        (menuitem|separator|placeholder|menu)* &gt;
&lt;!ELEMENT popup       (menuitem|separator|placeholder|menu)* &gt;
&lt;!ELEMENT toolbar     (toolitem|separator|placeholder)* &gt;
&lt;!ELEMENT placeholder (menuitem|toolitem|separator|placeholder|menu)* &gt;
&lt;!ELEMENT menuitem     EMPTY &gt;
&lt;!ELEMENT toolitem     EMPTY &gt;
&lt;!ELEMENT separator    EMPTY &gt;
&lt;!ATTLIST menubar      name               &num;IMPLIED &gt;
&lt;!ATTLIST toolbar      name               &num;IMPLIED &gt;
&lt;!ATTLIST popup        name               &num;IMPLIED &gt;
&lt;!ATTLIST placeholder  name               &num;IMPLIED &gt;
&lt;!ATTLIST menu         name               &num;IMPLIED
                       action             &num;REQUIRED
                       position (top|bot) &num;IMPLIED &gt;
&lt;!ATTLIST menuitem     name               &num;IMPLIED
                       action             &num;REQUIRED
                       position (top|bot) &num;IMPLIED &gt;
&lt;!ATTLIST toolitem     name               &num;IMPLIED
                       action             &num;REQUIRED
                       position (top|bot) &num;IMPLIED &gt;
</programlisting>
There are some additional restrictions beyond those specified in the
DTD, e.g. every toolitem must have a toolbar in its anchestry and
every menuitem must have a menubar or popup in its anchestry. Since
a #GMarkup parser is used to parse the UI description, it must not only
be valid XML, but valid #GMarkup. If a name is not specified, it defaults 
to the action. If an action is not specified either, the element name is 
used.  
</para>
<example>
<title>A UI definition</title>
<programlisting>
&lt;ui&gt;
  &lt;menubar&gt;
    &lt;menu name="FileMenu" action="FileMenuAction"&gt;
      &lt;menuitem name="New" action="New2Action" /&gt;
      &lt;placeholder name="FileMenuAdditions" /&gt;
    &lt;/menu&gt;
    &lt;menu name="JustifyMenu" action="JustifyMenuAction"&gt;
      &lt;menuitem name="Left" action="justify-left"/&gt;
      &lt;menuitem name="Centre" action="justify-center"/&gt;
      &lt;menuitem name="Right" action="justify-right"/&gt;
      &lt;menuitem name="Fill" action="justify-fill"/&gt;
    &lt;/menu&gt;
  &lt;/menubar&gt;
  &lt;toolbar action="toolbar1"&gt;
    &lt;placeholder name="JustifyToolItems"&gt;
      &lt;separator/&gt;
      &lt;toolitem name="Left" action="justify-left"/&gt;
      &lt;toolitem name="Centre" action="justify-center"/&gt;
      &lt;toolitem name="Right" action="justify-right"/&gt;
      &lt;toolitem name="Fill" action="justify-fill"/&gt;
      &lt;separator/&gt;
    &lt;/placeholder&gt;
  &lt;/toolbar&gt;
&lt;/ui&gt;
</programlisting>
</example>
<para>
The constructed widget hierarchy is very similar to the element tree
of the XML, with the exception that placeholders are merged into their
parents. The correspondence of XML elements to widgets should be
almost obvious: 
<variablelist>
<varlistentry><term>menubar</term>
<listitem><para>a #GtkMenuBar</para></listitem>
</varlistentry>
<varlistentry><term>toolbar</term>
<listitem><para>a #GtkToolbar</para></listitem>
</varlistentry>
<varlistentry><term>popup</term>
<listitem><para>a toplevel #GtkMenu</para></listitem>
</varlistentry>
<varlistentry><term>menu</term>
<listitem><para>a #GtkMenu attached to a menuitem</para></listitem>
</varlistentry>
<varlistentry><term>menuitem</term>
<listitem><para>a #GtkMenuItem subclass, the exact type depends on the
action</para></listitem> 
</varlistentry>
<varlistentry><term>toolitem</term>
<listitem><para>a #GtkToolItem subclass, the exact type depends on the
action</para></listitem> 
</varlistentry>
<varlistentry><term>separator</term>
<listitem><para>a #GtkSeparatorMenuItem or
#GtkSeparatorToolItem</para></listitem> 
</varlistentry>
</variablelist>
</para>
<para>
The "position" attribute determines where a constructed widget is positioned
wrt. to its siblings in the partially constructed tree. If it is
"top", the widget is prepended, otherwise it is appended.
</para>
</refsect2>
<refsect2 id="UI-Merging">
<title>UI Merging</title>
<para>
The most remarkable feature of #GtkUIManager is that it can overlay a set
of menuitems and toolitems over another one, and demerge them later.
</para>
<para>
Merging is done based on the name of the XML elements. Each element is 
identified by a path which consists of the names of its anchestors, separated
by slashes. For example, the menuitem named "Left" in the example above
has the path <literal>/ui/menubar/JustifyMenu/Left</literal> and the
toolitem with the same name has path 
<literal>/ui/toolbar1/JustifyToolItems/Left</literal>.
</para>
</refsect2>

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<para>

</para>

<!-- ##### STRUCT GtkUIManager ##### -->
<para>
The <structname>GtkUIManager</structname> struct contains only private
members and should not be accessed directly.
</para>


<!-- ##### FUNCTION gtk_ui_manager_new ##### -->
<para>

</para>

@Returns: 


<!-- ##### FUNCTION gtk_ui_manager_set_add_tearoffs ##### -->
<para>

</para>

@self: 
@add_tearoffs: 


<!-- ##### FUNCTION gtk_ui_manager_get_add_tearoffs ##### -->
<para>

</para>

@self: 
@Returns: 


<!-- ##### FUNCTION gtk_ui_manager_insert_action_group ##### -->
<para>

</para>

@self: 
@action_group: 
@pos: 


<!-- ##### FUNCTION gtk_ui_manager_remove_action_group ##### -->
<para>

</para>

@self: 
@action_group: 


<!-- ##### FUNCTION gtk_ui_manager_get_action_groups ##### -->
<para>

</para>

@self: 
@Returns: 


<!-- ##### FUNCTION gtk_ui_manager_get_accel_group ##### -->
<para>

</para>

@self: 
@Returns: 


<!-- ##### FUNCTION gtk_ui_manager_get_widget ##### -->
<para>

</para>

@self: 
@path: 
@Returns: 


<!-- ##### FUNCTION gtk_ui_manager_get_action ##### -->
<para>

</para>

@self: 
@path: 
@Returns: 


<!-- ##### FUNCTION gtk_ui_manager_add_ui_from_string ##### -->
<para>

</para>

@self: 
@buffer: 
@length: 
@error: 
@Returns: 


<!-- ##### FUNCTION gtk_ui_manager_add_ui_from_file ##### -->
<para>

</para>

@self: 
@filename: 
@error: 
@Returns: 


<!-- ##### FUNCTION gtk_ui_manager_new_merge_id ##### -->
<para>

</para>

@self: 
@Returns: 


<!-- ##### FUNCTION gtk_ui_manager_add_ui ##### -->
<para>

</para>

@self: 
@merge_id: 
@path: 
@name: 
@action: 


<!-- ##### FUNCTION gtk_ui_manager_remove_ui ##### -->
<para>

</para>

@self: 
@merge_id: 


<!-- ##### FUNCTION gtk_ui_manager_get_ui ##### -->
<para>

</para>

@self: 
@Returns: 


<!-- ##### FUNCTION gtk_ui_manager_ensure_update ##### -->
<para>

</para>

@self: 


<!-- ##### SIGNAL GtkUIManager::add-widget ##### -->
<para>

</para>

@uimanager: the object which received the signal.
@widget: 

<!-- ##### SIGNAL GtkUIManager::changed ##### -->
<para>

</para>

@uimanager: the object which received the signal.

<!-- ##### ARG GtkUIManager:add-tearoffs ##### -->
<para>

</para>