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

<!-- ##### SECTION Title ##### -->
GtkMenu

<!-- ##### SECTION Short_Description ##### -->
a drop down menu widget.

<!-- ##### SECTION Long_Description ##### -->
<para>
A #GtkMenu is a #GtkMenuShell that implements a drop down menu consisting of
a list of #GtkMenuItem objects which can be navigated and activated by the 
user to perform application functions.
</para>

<para>
A #GtkMenu is most commonly dropped down by activating a #GtkMenuItem in a 
#GtkMenuBar or popped up by activating a #GtkMenuItem in another #GtkMenu.  
</para>

<para>
A #GtkMenu can also be popped up by activating a #GtkOptionMenu.  
Other composite widgets such as the #GtkNotebook can pop up a #GtkMenu 
as well.
</para>

<para>
Applications can display a #GtkMenu as a popup menu by calling the 
gtk_menu_popup() function.  The example below shows how an application
can pop up a menu when the 3rd mouse button is pressed.  
</para>

<example>
<title>Connecting the popup signal handler.</title>
<programlisting>
    /* connect our handler which will popup the menu */
    gtk_signal_connect_object(GTK_OBJECT(window), "button_press_event",
	GTK_SIGNAL_FUNC (my_popup_handler), GTK_OBJECT(menu));
</programlisting>
</example>

<example>
<title>Signal handler which displays a popup menu.</title>
<programlisting>
static gint
my_popup_handler(GtkWidget *widget, GdkEvent *event)
{
  GtkMenu *menu;
  GdkEventButton *event_button;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  /* The "widget" is the menu that was supplied when 
   * gtk_signal_connect_object was called.
   */
  menu = GTK_MENU (widget);

  if (event->type == GDK_BUTTON_PRESS)
    {
      event_button = (GdkEventButton *) event;
      if (event_button->button == 3)
	{
	  gtk_menu_popup (menu, NULL, NULL, NULL, NULL, 
			  event_button->button, event_button->time);
	  return TRUE;
	}
    }

  return FALSE;
}
</programlisting>
</example>

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

</para>

<!-- ##### STRUCT GtkMenu ##### -->
<para>
The #GtkMenu-struct struct contains private data only, and
should be accessed using the functions below.
</para>

@menu_shell: 
@parent_menu_item: 
@old_active_menu_item: 
@accel_group: 
@position_func: 
@position_func_data: 
@toplevel: 
@tearoff_window: 
@torn_off: 

<!-- ##### FUNCTION gtk_menu_new ##### -->
<para>
Creates a new #GtkMenu.
</para>

@Returns: a new #GtkMenu.


<!-- ##### FUNCTION gtk_menu_append ##### -->
<para>
Adds a new #GtkMenuItem to the end of the menu's item list.
</para>

@menu: a #GtkMenu.
@child: The #GtkMenuItem to add.


<!-- ##### FUNCTION gtk_menu_prepend ##### -->
<para>
Adds a new #GtkMenuItem to the beginning of the menu's item list.
</para>

@menu: a #GtkMenu.
@child: The #GtkMenuItem to add.


<!-- ##### FUNCTION gtk_menu_insert ##### -->
<para>
Adds a new #GtkMenuItem to the menu's item list at the position
indicated by @position. 
</para>

@menu: a #GtkMenu.
@child: The #GtkMenuItem to add.
@position: The position in the item list where @child is added.
Positions are numbered from 0 to n-1.


<!-- ##### FUNCTION gtk_menu_reorder_child ##### -->
<para>
Moves a #GtkMenuItem to a new position within the #GtkMenu.
</para>

@menu: a #GtkMenu.
@child: the #GtkMenuItem to move.
@position: the new position to place @child.  Positions are numbered from 
0 to n-1.


<!-- ##### FUNCTION gtk_menu_popup ##### -->
<para>
Displays a menu and makes it available for selection.  Applications can use
this function to display context-sensitive menus, and will typically supply
NULL for the @parent_menu_shell, @parent_menu_item, @func and @data 
parameters.  The default menu positioning function will position the menu
at the current pointer position.
</para>

@menu: a #GtkMenu.
@parent_menu_shell: the menu shell containing the triggering menu item.
@parent_menu_item: the menu item whose activation triggered the popup.
@func: a user supplied function used to position the menu.
@data: user supplied data to be passed to @func.
@button: the button which was pressed to initiate the event.
@activate_time: the time at which the activation event occurred.


<!-- ##### FUNCTION gtk_menu_set_accel_group ##### -->
<para>
Set the #GtkAccelGroup which holds global accelerators for the menu.
</para>

@menu: a #GtkMenu.
@accel_group: the #GtkAccelGroup to be associated with the menu.


<!-- ##### FUNCTION gtk_menu_set_title ##### -->
<para>
Sets the title string for the menu.  The title is displayed when the menu
is shown as a tearoff menu.
</para>

@menu: a #GtkMenu.
@title: a string containing the title for the menu.


<!-- ##### FUNCTION gtk_menu_popdown ##### -->
<para>
Removes the menu from the screen.
</para>

@menu: a #GtkMenu.


<!-- ##### FUNCTION gtk_menu_reposition ##### -->
<para>
Repositions the menu according to its position function.
</para>

@menu: a #GtkMenu.


<!-- ##### FUNCTION gtk_menu_get_active ##### -->
<para>
Returns the selected menu item from the menu.  This is used by the 
#GtkOptionMenu.
</para>

@menu: a #GtkMenu.
@Returns: the #GtkMenuItem that was last selected in the menu.  If a 
selection has not yet been made, the first menu item is selected.


<!-- ##### FUNCTION gtk_menu_set_active ##### -->
<para>
Selects the specified menu item within the menu.  This is used by the
#GtkOptionMenu.
</para>

@menu: a #GtkMenu.
@index: the index of the menu item to select.  Index values are from
0 to n-1.


<!-- ##### FUNCTION gtk_menu_set_tearoff_state ##### -->
<para>
Changes the tearoff state of the menu.  A menu is normally displayed 
as drop down menu which persists as long as the menu is active.  It can 
also be displayed as a tearoff menu which persists until it is closed 
or reattached.
</para>

@menu: a #GtkMenu.
@torn_off: If TRUE, menu is displayed as a tearoff menu.


<!-- ##### FUNCTION gtk_menu_attach_to_widget ##### -->
<para>
Attaches the menu to the widget and provides a callback function that will
be invoked when the menu calls gtk_menu_detach() during its destruction.
</para>

@menu: a #GtkMenu.
@attach_widget: the #GtkWidget that the menu will be attached to.
@detacher: the user supplied callback function that will be called when 
the menu calls gtk_menu_detach().


<!-- ##### FUNCTION gtk_menu_detach ##### -->
<para>
Detaches the menu from the widget to which it had been attached.  
This function will call the callback function, @detacher, provided
when the gtk_menu_attach_to_widget() function was called.
</para>

@menu: a #GtkMenu.


<!-- ##### FUNCTION gtk_menu_get_attach_widget ##### -->
<para>
Returns the #GtkWidget that the menu is attached to.
</para>

@menu: a #GtkMenu.
@Returns: the #GtkWidget that the menu is attached to.


<!-- ##### USER_FUNCTION GtkMenuPositionFunc ##### -->
<para>
A user function supplied when calling gtk_menu_popup() which controls the
positioning of the menu when it is displayed.  The function sets the @x
and @y parameters to the coordinates where the menu is to be drawn.
</para>

@menu: a #GtkMenu.
@x: address of the #gint representing the horizontal position where the
menu shall be drawn.  This is an output parameter.
@y: address of the #gint representing the vertical position where the
menu shall be drawn.  This is an output parameter.
@user_data: the data supplied by the user in the gtk_menu_popup() @data
parameter.


<!-- ##### USER_FUNCTION GtkMenuDetachFunc ##### -->
<para>
A user function supplied when calling gtk_menu_attach_to_widget() which 
will be called when the menu is later detached from the widget.
</para>

@attach_widget: the #GtkWidget that the menu is being detached from.
@menu: the #GtkMenu being detached.