UIManager


Object Hierarchy:

Object hierarchy for UIManager

Description:

[ Version ( deprecated = true , deprecated_since = "3.10" ) ]
public class UIManager : Object, Buildable

Warning: UIManager is deprecated since "3.10".

Note:

GtkUIManager is deprecated since GTK+ 3.10. To construct user interfaces from XML definitions, you should use Builder, MenuModel, et al. To work with actions, use Action, Actionable et al. These newer classes support richer functionality and integration with various desktop shells. It should be possible to migrate most/all functionality from GtkUIManager.

A UIManager constructs a user interface (menus and toolbars) from one or more UI definitions, which reference actions from one or more action groups.

UI Definitions

The UI definitions are specified in an XML format which can be roughly described by the following DTD.

Note:

Do not confuse the GtkUIManager UI Definitions described here with the similarly named GtkBuilder UI Definitions.

<!ELEMENT ui          (menubar|toolbar|popup|accelerator)* >
<!ELEMENT menubar (menuitem|separator|placeholder|menu)* >
<!ELEMENT menu (menuitem|separator|placeholder|menu)* >
<!ELEMENT popup (menuitem|separator|placeholder|menu)* >
<!ELEMENT toolbar (toolitem|separator|placeholder)* >
<!ELEMENT placeholder (menuitem|toolitem|separator|placeholder|menu)* >
<!ELEMENT menuitem EMPTY >
<!ELEMENT toolitem (menu?) >
<!ELEMENT separator EMPTY >
<!ELEMENT accelerator EMPTY >
<!ATTLIST menubar name #IMPLIED
action #IMPLIED >
<!ATTLIST toolbar name #IMPLIED
action #IMPLIED >
<!ATTLIST popup name #IMPLIED
action #IMPLIED
accelerators (true|false) #IMPLIED >
<!ATTLIST placeholder name #IMPLIED
action #IMPLIED >
<!ATTLIST separator name #IMPLIED
action #IMPLIED
expand (true|false) #IMPLIED >
<!ATTLIST menu name #IMPLIED
action #REQUIRED
position (top|bot) #IMPLIED >
<!ATTLIST menuitem name #IMPLIED
action #REQUIRED
position (top|bot) #IMPLIED
always-show-image (true|false) #IMPLIED >
<!ATTLIST toolitem name #IMPLIED
action #REQUIRED
position (top|bot) #IMPLIED >
<!ATTLIST accelerator name #IMPLIED
action #REQUIRED >

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 MarkupParser is used to parse the UI description, it must not only be valid XML, but valid markup.

If a name is not specified, it defaults to the action. If an action is not specified either, the element name is used. The name and action attributes must not contain “/” characters after parsing (since that would mess up path lookup) and must be usable as XML attributes when enclosed in doublequotes, thus they must not “"” characters or references to the &quot; entity.

A UI definition

<ui>
<menubar>
<menu name="FileMenu" action="FileMenuAction">
<menuitem name="New" action="New2Action" />
<placeholder name="FileMenuAdditions" />
</menu>
<menu name="JustifyMenu" action="JustifyMenuAction">
<menuitem name="Left" action="justify-left"/>
<menuitem name="Centre" action="justify-center"/>
<menuitem name="Right" action="justify-right"/>
<menuitem name="Fill" action="justify-fill"/>
</menu>
</menubar>
<toolbar action="toolbar1">
<placeholder name="JustifyToolItems">
<separator/>
<toolitem name="Left" action="justify-left"/>
<toolitem name="Centre" action="justify-center"/>
<toolitem name="Right" action="justify-right"/>
<toolitem name="Fill" action="justify-fill"/>
<separator/>
</placeholder>
</toolbar>
</ui>

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:

  • menubar

    a MenuBar

  • toolbar

    a Toolbar

  • popup

    a toplevel Menu

  • menu

    a Menu attached to a menuitem

  • menuitem

    a MenuItem subclass, the exact type depends on the action

  • toolitem

    a ToolItem subclass, the exact type depends on the action. Note that toolitem elements may contain a menu element, but only if their associated action specifies a MenuToolButton as proxy.

  • separator

    a SeparatorMenuItem or SeparatorToolItem

  • accelerator

    a keyboard accelerator

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.

UI Merging

The most remarkable feature of UIManager is that it can overlay a set of menuitems and toolitems over another one, and demerge them later.

Merging is done based on the names 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 `/ui/menubar/JustifyMenu/Left` and the toolitem with the same name has path `/ui/toolbar1/JustifyToolItems/Left`.

Accelerators

Every action has an accelerator path. Accelerators are installed together with menuitem proxies, but they can also be explicitly added with <accelerator> elements in the UI definition. This makes it possible to have accelerators for actions even if they have no visible proxies.

Smart Separators

The separators created by UIManager are “smart”, i.e. they do not show up in the UI unless they end up between two visible menu or tool items. Separators which are located at the very beginning or end of the menu or toolbar containing them, or multiple separators next to each other, are hidden. This is a useful feature, since the merging of UI elements from multiple sources can make it hard or impossible to determine in advance whether a separator will end up in such an unfortunate position.

For separators in toolbars, you can set `expand="true"` to turn them from a small, visible separator to an expanding, invisible one. Toolitems following an expanding separator are effectively right-aligned.

Empty Menus

Submenus pose similar problems to separators inconnection with merging. It is impossible to know in advance whether they will end up empty after merging. UIManager offers two ways to treat empty submenus:

  • make them disappear by hiding the menu item they’re attached to
  • add an insensitive “Empty” item

The behaviour is chosen based on the “hide_if_empty” property of the action to which the submenu is associated.

GtkUIManager as GtkBuildable

The GtkUIManager implementation of the GtkBuildable interface accepts GtkActionGroup objects as <child> elements in UI definitions.

A GtkUIManager UI definition as described above can be embedded in an GtkUIManager <object> element in a GtkBuilder UI definition.

The widgets that are constructed by a GtkUIManager can be embedded in other parts of the constructed user interface with the help of the “constructor” attribute. See the example below.

An embedded GtkUIManager UI definition

<object class="GtkUIManager" id="uiman">
<child>
<object class="GtkActionGroup" id="actiongroup">
<child>
<object class="GtkAction" id="file">
<property name="label">_File</property>
</object>
</child>
</object>
</child>
<ui>
<menubar name="menubar1">
<menu action="file">
</menu>
</menubar>
</ui>
</object>
<object class="GtkWindow" id="main-window">
<child>
<object class="GtkMenuBar" id="menubar1" constructor="uiman"/>
</child>
</object>


Namespace: Gtk
Package: gtk+-3.0

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