<< Back to man.ChinaUnix.net

<< Back to man.ChinaUnix.net

GtkMenu

GtkMenu — A menu widget

Synopsis


#include <gtk/gtk.h>


            GtkMenu;
GtkWidget*  gtk_menu_new                    (void);
void        gtk_menu_set_screen             (GtkMenu *menu,
                                             GdkScreen *screen);
#define     gtk_menu_append                 (menu,child)
#define     gtk_menu_prepend                (menu,child)
#define     gtk_menu_insert                 (menu,child,pos)
void        gtk_menu_reorder_child          (GtkMenu *menu,
                                             GtkWidget *child,
                                             gint position);
void        gtk_menu_attach                 (GtkMenu *menu,
                                             GtkWidget *child,
                                             guint left_attach,
                                             guint right_attach,
                                             guint top_attach,
                                             guint bottom_attach);
void        gtk_menu_popup                  (GtkMenu *menu,
                                             GtkWidget *parent_menu_shell,
                                             GtkWidget *parent_menu_item,
                                             GtkMenuPositionFunc func,
                                             gpointer data,
                                             guint button,
                                             guint32 activate_time);
void        gtk_menu_set_accel_group        (GtkMenu *menu,
                                             GtkAccelGroup *accel_group);
GtkAccelGroup* gtk_menu_get_accel_group     (GtkMenu *menu);
void        gtk_menu_set_accel_path         (GtkMenu *menu,
                                             const gchar *accel_path);
void        gtk_menu_set_title              (GtkMenu *menu,
                                             const gchar *title);
gboolean    gtk_menu_get_tearoff_state      (GtkMenu *menu);
const gchar* gtk_menu_get_title             (GtkMenu *menu);

void        gtk_menu_popdown                (GtkMenu *menu);
void        gtk_menu_reposition             (GtkMenu *menu);
GtkWidget*  gtk_menu_get_active             (GtkMenu *menu);
void        gtk_menu_set_active             (GtkMenu *menu,
                                             guint index_);
void        gtk_menu_set_tearoff_state      (GtkMenu *menu,
                                             gboolean torn_off);
void        gtk_menu_attach_to_widget       (GtkMenu *menu,
                                             GtkWidget *attach_widget,
                                             GtkMenuDetachFunc detacher);
void        gtk_menu_detach                 (GtkMenu *menu);
GtkWidget*  gtk_menu_get_attach_widget      (GtkMenu *menu);
GList*      gtk_menu_get_for_attach_widget  (GtkWidget *widget);
void        (*GtkMenuPositionFunc)          (GtkMenu *menu,
                                             gint *x,
                                             gint *y,
                                             gboolean *push_in,
                                             gpointer user_data);
void        (*GtkMenuDetachFunc)            (GtkWidget *attach_widget,
                                             GtkMenu *menu);
void        gtk_menu_set_monitor            (GtkMenu *menu,
                                             gint monitor_num);


Object Hierarchy


  GObject
   +----GtkObject
         +----GtkWidget
               +----GtkContainer
                     +----GtkMenuShell
                           +----GtkMenu

Implemented Interfaces

GtkMenu implements AtkImplementorIface.

Properties


  "tearoff-state"        gboolean              : Read / Write
  "tearoff-title"        gchararray            : Read / Write

Child Properties


  "bottom-attach"        gint                  : Read / Write
  "left-attach"          gint                  : Read / Write
  "right-attach"         gint                  : Read / Write
  "top-attach"           gint                  : Read / Write

Style Properties


  "horizontal-offset"    gint                  : Read
  "vertical-offset"      gint                  : Read
  "vertical-padding"     gint                  : Read

Signal Prototypes


"move-scroll"
            void        user_function      (GtkMenu *menu,
                                            GtkScrollType arg1,
                                            gpointer user_data);

Description

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.

A GtkMenu is most commonly dropped down by activating a GtkMenuItem in a GtkMenuBar or popped up by activating a GtkMenuItem in another GtkMenu.

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.

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.

Example 1. Connecting the popup signal handler.

    /* connect our handler which will popup the menu */
    g_signal_connect_swapped (window, "button_press_event",
	G_CALLBACK (my_popup_handler), menu);

Example 2. Signal handler which displays a popup menu.

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 
   * g_signal_connect_swapped() 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;
}

Details

GtkMenu

typedef struct _GtkMenu GtkMenu;

The GtkMenu struct contains private data only, and should be accessed using the functions below.


gtk_menu_new ()

GtkWidget*  gtk_menu_new                    (void);

Creates a new GtkMenu.

Returns :a new GtkMenu.

gtk_menu_set_screen ()

void        gtk_menu_set_screen             (GtkMenu *menu,
                                             GdkScreen *screen);

Sets the GdkScreen on which the menu will be displayed.

menu : a GtkMenu.
screen : a GdkScreen, or NULL if the screen should be determined by the widget the menu is attached to.

Since 2.2


gtk_menu_append()

#define gtk_menu_append(menu,child)	gtk_menu_shell_append  ((GtkMenuShell *)(menu),(child))

Warning

gtk_menu_append is deprecated and should not be used in newly-written code.

Adds a new GtkMenuItem to the end of the menu's item list.

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

gtk_menu_prepend()

#define gtk_menu_prepend(menu,child)    gtk_menu_shell_prepend ((GtkMenuShell *)(menu),(child))

Warning

gtk_menu_prepend is deprecated and should not be used in newly-written code.

Adds a new GtkMenuItem to the beginning of the menu's item list.

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

gtk_menu_insert()

#define gtk_menu_insert(menu,child,pos)	gtk_menu_shell_insert ((GtkMenuShell *)(menu),(child),(pos))

Warning

gtk_menu_insert is deprecated and should not be used in newly-written code.

Adds a new GtkMenuItem to the menu's item list at the position indicated by position.

menu :a GtkMenu.
child :The GtkMenuItem to add.
pos :

gtk_menu_reorder_child ()

void        gtk_menu_reorder_child          (GtkMenu *menu,
                                             GtkWidget *child,
                                             gint position);

Moves a GtkMenuItem to a new position within the GtkMenu.

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

gtk_menu_attach ()

void        gtk_menu_attach                 (GtkMenu *menu,
                                             GtkWidget *child,
                                             guint left_attach,
                                             guint right_attach,
                                             guint top_attach,
                                             guint bottom_attach);

Adds a new GtkMenuItem to a (table) menu. The number of 'cells' that an item will occupy is specified by left_attach, right_attach, top_attach and bottom_attach. These each represent the leftmost, rightmost, uppermost and lower column and row numbers of the table. (Columns and rows are indexed from zero).

Note that this function is not related to gtk_menu_detach().

menu : a GtkMenu.
child : a GtkMenuItem.
left_attach : The column number to attach the left side of the item to.
right_attach : The column number to attach the right side of the item to.
top_attach : The row number to attach the top of the item to.
bottom_attach : The row number to attach the bottom of the item to.

Since 2.4


gtk_menu_popup ()

void        gtk_menu_popup                  (GtkMenu *menu,
                                             GtkWidget *parent_menu_shell,
                                             GtkWidget *parent_menu_item,
                                             GtkMenuPositionFunc func,
                                             gpointer data,
                                             guint button,
                                             guint32 activate_time);

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 mouse cursor position.

The button parameter should be the mouse button pressed to initiate the menu popup. If the menu popup was initiated by something other than a mouse button press, such as a mouse button release or a keypress, button should be 0.

The activate_time parameter should be the time stamp of the event that initiated the popup. If such an event is not available, use gtk_get_current_event_time() instead.

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

gtk_menu_set_accel_group ()

void        gtk_menu_set_accel_group        (GtkMenu *menu,
                                             GtkAccelGroup *accel_group);

Set the GtkAccelGroup which holds global accelerators for the menu. This accelerator group needs to also be added to all windows that this menu is being used in with gtk_window_add_accel_group(), in order for those windows to support all the accelerators contained in this group.

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

gtk_menu_get_accel_group ()

GtkAccelGroup* gtk_menu_get_accel_group     (GtkMenu *menu);

Gets the GtkAccelGroup which holds global accelerators for the menu. See gtk_menu_set_accel_group().

menu :a GtkMenu.
Returns :the GtkAccelGroup associated with the menu.

gtk_menu_set_accel_path ()

void        gtk_menu_set_accel_path         (GtkMenu *menu,
                                             const gchar *accel_path);

Sets an accelerator path for this menu from which accelerator paths for its immediate children, its menu items, can be constructed. The main purpose of this function is to spare the programmer the inconvenience of having to call gtk_menu_item_set_accel_path() on each menu item that should support runtime user changable accelerators. Instead, by just calling gtk_menu_set_accel_path() on their parent, each menu item of this menu, that contains a label describing its purpose, automatically gets an accel path assigned. For example, a menu containing menu items "New" and "Exit", will, after gtk_menu_set_accel_path (menu, "<Gnumeric-Sheet>/File"); has been called, assign its items the accel paths: "<Gnumeric-Sheet>/File/New" and "<Gnumeric-Sheet>/File/Exit". Assigning accel paths to menu items then enables the user to change their accelerators at runtime. More details about accelerator paths and their default setups can be found at gtk_accel_map_add_entry().

menu : a valid GtkMenu
accel_path : a valid accelerator path

gtk_menu_set_title ()

void        gtk_menu_set_title              (GtkMenu *menu,
                                             const gchar *title);

Sets the title string for the menu. The title is displayed when the menu is shown as a tearoff menu.

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

gtk_menu_get_tearoff_state ()

gboolean    gtk_menu_get_tearoff_state      (GtkMenu *menu);

Returns whether the menu is torn off. See gtk_menu_set_tearoff_state().

menu : a GtkMenu
Returns : TRUE if the menu is currently torn off.

gtk_menu_get_title ()

const gchar* gtk_menu_get_title             (GtkMenu *menu);

Returns the title of the menu. See gtk_menu_set_title().

menu : a GtkMenu
Returns : the title of the menu, or NULL if the menu has no title set on it. This string is owned by the widget and should not be modified or freed.

gtk_menu_popdown ()

void        gtk_menu_popdown                (GtkMenu *menu);

Removes the menu from the screen.

menu :a GtkMenu.

gtk_menu_reposition ()

void        gtk_menu_reposition             (GtkMenu *menu);

Repositions the menu according to its position function.

menu :a GtkMenu.

gtk_menu_get_active ()

GtkWidget*  gtk_menu_get_active             (GtkMenu *menu);

Returns the selected menu item from the menu. This is used by the GtkOptionMenu.

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.

gtk_menu_set_active ()

void        gtk_menu_set_active             (GtkMenu *menu,
                                             guint index_);

Selects the specified menu item within the menu. This is used by the GtkOptionMenu and should not be used by anyone else.

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

gtk_menu_set_tearoff_state ()

void        gtk_menu_set_tearoff_state      (GtkMenu *menu,
                                             gboolean torn_off);

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.

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

gtk_menu_attach_to_widget ()

void        gtk_menu_attach_to_widget       (GtkMenu *menu,
                                             GtkWidget *attach_widget,
                                             GtkMenuDetachFunc detacher);

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.

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().

gtk_menu_detach ()

void        gtk_menu_detach                 (GtkMenu *menu);

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.

menu :a GtkMenu.

gtk_menu_get_attach_widget ()

GtkWidget*  gtk_menu_get_attach_widget      (GtkMenu *menu);

Returns the GtkWidget that the menu is attached to.

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

gtk_menu_get_for_attach_widget ()

GList*      gtk_menu_get_for_attach_widget  (GtkWidget *widget);

Returns a list of the menus which are attached to this widget. This list is owned by GTK+ and must not be modified.

widget : a GtkWidget
Returns : the list of menus attached to his widget.

Since 2.6


GtkMenuPositionFunc ()

void        (*GtkMenuPositionFunc)          (GtkMenu *menu,
                                             gint *x,
                                             gint *y,
                                             gboolean *push_in,
                                             gpointer user_data);

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.

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.
push_in :whether the menu should be pushed in to be completely inside the screen instead of just clamped to the size to the screen.
user_data :the data supplied by the user in the gtk_menu_popup() data parameter.

GtkMenuDetachFunc ()

void        (*GtkMenuDetachFunc)            (GtkWidget *attach_widget,
                                             GtkMenu *menu);

A user function supplied when calling gtk_menu_attach_to_widget() which will be called when the menu is later detached from the widget.

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

gtk_menu_set_monitor ()

void        gtk_menu_set_monitor            (GtkMenu *menu,
                                             gint monitor_num);

Informs GTK+ on which monitor a menu should be popped up. See gdk_screen_get_monitor_geometry().

This function should be called from a GtkMenuPositionFunc if the menu should not appear on the same monitor as the pointer. This information can't be reliably inferred from the coordinates returned by a GtkMenuPositionFunc, since, for very long menus, these coordinates may extend beyond the monitor boundaries or even the screen boundaries.

menu : a GtkMenu
monitor_num : the number of the monitor on which the menu should be popped up

Since 2.4

Properties

The "tearoff-state" property

  "tearoff-state"        gboolean              : Read / Write

A boolean that indicates whether the menu is torn-off.

Default value: FALSE

Since 2.6


The "tearoff-title" property

  "tearoff-title"        gchararray            : Read / Write

A title that may be displayed by the window manager when this menu is torn-off.

Default value: ""

Child Properties

The "bottom-attach" child property

  "bottom-attach"        gint                  : Read / Write

The row number to attach the bottom of the child to.

Allowed values: >= -1

Default value: -1


The "left-attach" child property

  "left-attach"          gint                  : Read / Write

The column number to attach the left side of the child to.

Allowed values: >= -1

Default value: -1


The "right-attach" child property

  "right-attach"         gint                  : Read / Write

The column number to attach the right side of the child to.

Allowed values: >= -1

Default value: -1


The "top-attach" child property

  "top-attach"           gint                  : Read / Write

The row number to attach the top of the child to.

Allowed values: >= -1

Default value: -1

Style Properties

The "horizontal-offset" style property

  "horizontal-offset"    gint                  : Read

When the menu is a submenu, position it this number of pixels offset horizontally.

Default value: -2


The "vertical-offset" style property

  "vertical-offset"      gint                  : Read

When the menu is a submenu, position it this number of pixels offset vertically.

Default value: 0


The "vertical-padding" style property

  "vertical-padding"     gint                  : Read

Extra space at the top and bottom of the menu.

Allowed values: >= 0

Default value: 1

Signals

The "move-scroll" signal

void        user_function                  (GtkMenu *menu,
                                            GtkScrollType arg1,
                                            gpointer user_data);

menu :the object which received the signal.
arg1 :
user_data :user data set when the signal handler was connected.