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[Emacs-diffs] Changes to emacs/src/macmenu.c [gnus-5_10-branch]


From: Miles Bader
Subject: [Emacs-diffs] Changes to emacs/src/macmenu.c [gnus-5_10-branch]
Date: Sat, 04 Sep 2004 08:15:33 -0400

Index: emacs/src/macmenu.c
diff -c /dev/null emacs/src/macmenu.c:1.15.2.1
*** /dev/null   Sat Sep  4 12:03:34 2004
--- emacs/src/macmenu.c Sat Sep  4 12:01:18 2004
***************
*** 0 ****
--- 1,2394 ----
+ /* Menu support for GNU Emacs on the for Mac OS.
+    Copyright (C) 2000, 2001, 2002, 2003  Free Software Foundation, Inc.
+ 
+ This file is part of GNU Emacs.
+ 
+ GNU Emacs is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+ 
+ GNU Emacs is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+ 
+ You should have received a copy of the GNU General Public License
+ along with GNU Emacs; see the file COPYING.  If not, write to
+ the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.  */
+ 
+ /* Contributed by Andrew Choi (address@hidden).  */
+ 
+ #include <config.h>
+ #include <signal.h>
+ 
+ #include <stdio.h>
+ #include "lisp.h"
+ #include "termhooks.h"
+ #include "keyboard.h"
+ #include "keymap.h"
+ #include "frame.h"
+ #include "window.h"
+ #include "blockinput.h"
+ #include "buffer.h"
+ #include "charset.h"
+ #include "coding.h"
+ 
+ #ifndef MAC_OSX
+ #include <MacTypes.h>
+ #include <Menus.h>
+ #include <QuickDraw.h>
+ #include <ToolUtils.h>
+ #include <Fonts.h>
+ #include <Controls.h>
+ #include <Windows.h>
+ #include <Events.h>
+ #if defined (__MRC__) || (__MSL__ >= 0x6000)
+ #include <ControlDefinitions.h>
+ #endif
+ #endif /* not MAC_OSX */
+ 
+ /* This may include sys/types.h, and that somehow loses
+    if this is not done before the other system files.  */
+ #include "macterm.h"
+ 
+ /* Load sys/types.h if not already loaded.
+    In some systems loading it twice is suicidal.  */
+ #ifndef makedev
+ #include <sys/types.h>
+ #endif
+ 
+ #include "dispextern.h"
+ 
+ #define POPUP_SUBMENU_ID 235
+ #define MIN_POPUP_SUBMENU_ID 512
+ #define MIN_MENU_ID 256
+ #define MIN_SUBMENU_ID 1
+ 
+ #define DIALOG_WINDOW_RESOURCE 130
+ 
+ #define HAVE_DIALOGS 1
+ 
+ #undef HAVE_MULTILINGUAL_MENU
+ #undef HAVE_DIALOGS /* TODO: Implement native dialogs.  */
+ 
+ /******************************************************************/
+ /* Definitions copied from lwlib.h */
+ 
+ typedef void * XtPointer;
+ 
+ enum button_type
+ {
+   BUTTON_TYPE_NONE,
+   BUTTON_TYPE_TOGGLE,
+   BUTTON_TYPE_RADIO
+ };
+ 
+ /* This structure is based on the one in ../lwlib/lwlib.h, modified
+    for Mac OS.  */
+ typedef struct _widget_value
+ {
+   /* name of widget */
+   Lisp_Object   lname;
+   char*               name;
+   /* value (meaning depend on widget type) */
+   char*               value;
+   /* keyboard equivalent. no implications for XtTranslations */
+   Lisp_Object   lkey;
+   char*               key;
+   /* Help string or nil if none.
+      GC finds this string through the frame's menu_bar_vector
+      or through menu_items.  */
+   Lisp_Object help;
+   /* true if enabled */
+   Boolean     enabled;
+   /* true if selected */
+   Boolean     selected;
+   /* The type of a button.  */
+   enum button_type button_type;
+   /* true if menu title */
+   Boolean       title;
+ #if 0
+   /* true if was edited (maintained by get_value) */
+   Boolean     edited;
+   /* true if has changed (maintained by lw library) */
+   change_type change;
+   /* true if this widget itself has changed,
+      but not counting the other widgets found in the `next' field.  */
+   change_type   this_one_change;
+ #endif
+   /* Contents of the sub-widgets, also selected slot for checkbox */
+   struct _widget_value*       contents;
+   /* data passed to callback */
+   XtPointer   call_data;
+   /* next one in the list */
+   struct _widget_value*       next;
+ #if 0
+   /* slot for the toolkit dependent part.  Always initialize to NULL. */
+   void* toolkit_data;
+   /* tell us if we should free the toolkit data slot when freeing the
+      widget_value itself. */
+   Boolean free_toolkit_data;
+ 
+   /* we resource the widget_value structures; this points to the next
+      one on the free list if this one has been deallocated.
+    */
+   struct _widget_value *free_list;
+ #endif
+ } widget_value;
+ 
+ /* Assumed by other routines to zero area returned.  */
+ #define malloc_widget_value() (void *)memset (xmalloc (sizeof 
(widget_value)),\
+                                               0, (sizeof (widget_value)))
+ #define free_widget_value(wv) xfree (wv)
+ 
+ /******************************************************************/
+ 
+ #ifndef TRUE
+ #define TRUE 1
+ #define FALSE 0
+ #endif /* no TRUE */
+ 
+ Lisp_Object Vmenu_updating_frame;
+ 
+ Lisp_Object Qdebug_on_next_call;
+ 
+ extern Lisp_Object Qmenu_bar;
+ 
+ extern Lisp_Object QCtoggle, QCradio;
+ 
+ extern Lisp_Object Voverriding_local_map;
+ extern Lisp_Object Voverriding_local_map_menu_flag;
+ 
+ extern Lisp_Object Qoverriding_local_map, Qoverriding_terminal_local_map;
+ 
+ extern Lisp_Object Qmenu_bar_update_hook;
+ 
+ #if TARGET_API_MAC_CARBON
+ #define ENCODE_MENU_STRING(str) ENCODE_UTF_8 (str)
+ #else
+ #define ENCODE_MENU_STRING(str) ENCODE_SYSTEM (str)
+ #endif
+ 
+ void set_frame_menubar ();
+ 
+ static void push_menu_item P_ ((Lisp_Object, Lisp_Object, Lisp_Object,
+                               Lisp_Object, Lisp_Object, Lisp_Object,
+                               Lisp_Object, Lisp_Object));
+ #ifdef HAVE_DIALOGS
+ static Lisp_Object mac_dialog_show ();
+ #endif
+ static Lisp_Object mac_menu_show ();
+ 
+ static void keymap_panes ();
+ static void single_keymap_panes ();
+ static void single_menu_item ();
+ static void list_of_panes ();
+ static void list_of_items ();
+ 
+ static void fill_submenu (MenuHandle, widget_value *);
+ static void fill_menubar (widget_value *);
+ 
+ 
+ /* This holds a Lisp vector that holds the results of decoding
+    the keymaps or alist-of-alists that specify a menu.
+ 
+    It describes the panes and items within the panes.
+ 
+    Each pane is described by 3 elements in the vector:
+    t, the pane name, the pane's prefix key.
+    Then follow the pane's items, with 5 elements per item:
+    the item string, the enable flag, the item's value,
+    the definition, and the equivalent keyboard key's description string.
+ 
+    In some cases, multiple levels of menus may be described.
+    A single vector slot containing nil indicates the start of a submenu.
+    A single vector slot containing lambda indicates the end of a submenu.
+    The submenu follows a menu item which is the way to reach the submenu.
+ 
+    A single vector slot containing quote indicates that the
+    following items should appear on the right of a dialog box.
+ 
+    Using a Lisp vector to hold this information while we decode it
+    takes care of protecting all the data from GC.  */
+ 
+ #define MENU_ITEMS_PANE_NAME 1
+ #define MENU_ITEMS_PANE_PREFIX 2
+ #define MENU_ITEMS_PANE_LENGTH 3
+ 
+ enum menu_item_idx
+ {
+   MENU_ITEMS_ITEM_NAME = 0,
+   MENU_ITEMS_ITEM_ENABLE,
+   MENU_ITEMS_ITEM_VALUE,
+   MENU_ITEMS_ITEM_EQUIV_KEY,
+   MENU_ITEMS_ITEM_DEFINITION,
+   MENU_ITEMS_ITEM_TYPE,
+   MENU_ITEMS_ITEM_SELECTED,
+   MENU_ITEMS_ITEM_HELP,
+   MENU_ITEMS_ITEM_LENGTH
+ };
+ 
+ static Lisp_Object menu_items;
+ 
+ /* Number of slots currently allocated in menu_items.  */
+ static int menu_items_allocated;
+ 
+ /* This is the index in menu_items of the first empty slot.  */
+ static int menu_items_used;
+ 
+ /* The number of panes currently recorded in menu_items,
+    excluding those within submenus.  */
+ static int menu_items_n_panes;
+ 
+ /* Current depth within submenus.  */
+ static int menu_items_submenu_depth;
+ 
+ /* Flag which when set indicates a dialog or menu has been posted by
+    Xt on behalf of one of the widget sets.  */
+ static int popup_activated_flag;
+ 
+ /* Index of the next submenu */
+ static int submenu_id;
+ 
+ static int next_menubar_widget_id;
+ 
+ /* This is set nonzero after the user activates the menu bar, and set
+    to zero again after the menu bars are redisplayed by prepare_menu_bar.
+    While it is nonzero, all calls to set_frame_menubar go deep.
+ 
+    I don't understand why this is needed, but it does seem to be
+    needed on Motif, according to Marcus Daniels <address@hidden>.  */
+ 
+ int pending_menu_activation;
+ 
+ /* Initialize the menu_items structure if we haven't already done so.
+    Also mark it as currently empty.  */
+ 
+ static void
+ init_menu_items ()
+ {
+   if (NILP (menu_items))
+     {
+       menu_items_allocated = 60;
+       menu_items = Fmake_vector (make_number (menu_items_allocated), Qnil);
+     }
+ 
+   menu_items_used = 0;
+   menu_items_n_panes = 0;
+   menu_items_submenu_depth = 0;
+ }
+ 
+ /* Call at the end of generating the data in menu_items.
+    This fills in the number of items in the last pane.  */
+ 
+ static void
+ finish_menu_items ()
+ {
+ }
+ 
+ /* Call when finished using the data for the current menu
+    in menu_items.  */
+ 
+ static void
+ discard_menu_items ()
+ {
+   /* Free the structure if it is especially large.
+      Otherwise, hold on to it, to save time.  */
+   if (menu_items_allocated > 200)
+     {
+       menu_items = Qnil;
+       menu_items_allocated = 0;
+     }
+ }
+ 
+ /* Make the menu_items vector twice as large.  */
+ 
+ static void
+ grow_menu_items ()
+ {
+   Lisp_Object old;
+   int old_size = menu_items_allocated;
+   old = menu_items;
+ 
+   menu_items_allocated *= 2;
+   menu_items = Fmake_vector (make_number (menu_items_allocated), Qnil);
+   bcopy (XVECTOR (old)->contents, XVECTOR (menu_items)->contents,
+        old_size * sizeof (Lisp_Object));
+ }
+ 
+ /* Begin a submenu.  */
+ 
+ static void
+ push_submenu_start ()
+ {
+   if (menu_items_used + 1 > menu_items_allocated)
+     grow_menu_items ();
+ 
+   XVECTOR (menu_items)->contents[menu_items_used++] = Qnil;
+   menu_items_submenu_depth++;
+ }
+ 
+ /* End a submenu.  */
+ 
+ static void
+ push_submenu_end ()
+ {
+   if (menu_items_used + 1 > menu_items_allocated)
+     grow_menu_items ();
+ 
+   XVECTOR (menu_items)->contents[menu_items_used++] = Qlambda;
+   menu_items_submenu_depth--;
+ }
+ 
+ /* Indicate boundary between left and right.  */
+ 
+ static void
+ push_left_right_boundary ()
+ {
+   if (menu_items_used + 1 > menu_items_allocated)
+     grow_menu_items ();
+ 
+   XVECTOR (menu_items)->contents[menu_items_used++] = Qquote;
+ }
+ 
+ /* Start a new menu pane in menu_items.
+    NAME is the pane name.  PREFIX_VEC is a prefix key for this pane.  */
+ 
+ static void
+ push_menu_pane (name, prefix_vec)
+      Lisp_Object name, prefix_vec;
+ {
+   if (menu_items_used + MENU_ITEMS_PANE_LENGTH > menu_items_allocated)
+     grow_menu_items ();
+ 
+   if (menu_items_submenu_depth == 0)
+     menu_items_n_panes++;
+   XVECTOR (menu_items)->contents[menu_items_used++] = Qt;
+   XVECTOR (menu_items)->contents[menu_items_used++] = name;
+   XVECTOR (menu_items)->contents[menu_items_used++] = prefix_vec;
+ }
+ 
+ /* Push one menu item into the current pane.  NAME is the string to
+    display.  ENABLE if non-nil means this item can be selected.  KEY
+    is the key generated by choosing this item, or nil if this item
+    doesn't really have a definition.  DEF is the definition of this
+    item.  EQUIV is the textual description of the keyboard equivalent
+    for this item (or nil if none).  TYPE is the type of this menu
+    item, one of nil, `toggle' or `radio'. */
+ 
+ static void
+ push_menu_item (name, enable, key, def, equiv, type, selected, help)
+      Lisp_Object name, enable, key, def, equiv, type, selected, help;
+ {
+   if (menu_items_used + MENU_ITEMS_ITEM_LENGTH > menu_items_allocated)
+     grow_menu_items ();
+ 
+   XVECTOR (menu_items)->contents[menu_items_used++] = name;
+   XVECTOR (menu_items)->contents[menu_items_used++] = enable;
+   XVECTOR (menu_items)->contents[menu_items_used++] = key;
+   XVECTOR (menu_items)->contents[menu_items_used++] = equiv;
+   XVECTOR (menu_items)->contents[menu_items_used++] = def;
+   XVECTOR (menu_items)->contents[menu_items_used++] = type;
+   XVECTOR (menu_items)->contents[menu_items_used++] = selected;
+   XVECTOR (menu_items)->contents[menu_items_used++] = help;
+ }
+ 
+ /* Look through KEYMAPS, a vector of keymaps that is NMAPS long,
+    and generate menu panes for them in menu_items.
+    If NOTREAL is nonzero,
+    don't bother really computing whether an item is enabled.  */
+ 
+ static void
+ keymap_panes (keymaps, nmaps, notreal)
+      Lisp_Object *keymaps;
+      int nmaps;
+      int notreal;
+ {
+   int mapno;
+ 
+   init_menu_items ();
+ 
+   /* Loop over the given keymaps, making a pane for each map.
+      But don't make a pane that is empty--ignore that map instead.
+      P is the number of panes we have made so far.  */
+   for (mapno = 0; mapno < nmaps; mapno++)
+     single_keymap_panes (keymaps[mapno],
+                          Fkeymap_prompt (keymaps[mapno]), Qnil, notreal, 10);
+ 
+   finish_menu_items ();
+ }
+ 
+ /* This is a recursive subroutine of keymap_panes.
+    It handles one keymap, KEYMAP.
+    The other arguments are passed along
+    or point to local variables of the previous function.
+    If NOTREAL is nonzero, only check for equivalent key bindings, don't
+    evaluate expressions in menu items and don't make any menu.
+ 
+    If we encounter submenus deeper than MAXDEPTH levels, ignore them.  */
+ 
+ static void
+ single_keymap_panes (keymap, pane_name, prefix, notreal, maxdepth)
+      Lisp_Object keymap;
+      Lisp_Object pane_name;
+      Lisp_Object prefix;
+      int notreal;
+      int maxdepth;
+ {
+   Lisp_Object pending_maps = Qnil;
+   Lisp_Object tail, item;
+   struct gcpro gcpro1, gcpro2;
+ 
+   if (maxdepth <= 0)
+     return;
+ 
+   push_menu_pane (pane_name, prefix);
+ 
+   for (tail = keymap; CONSP (tail); tail = XCDR (tail))
+     {
+       GCPRO2 (keymap, pending_maps);
+       /* Look at each key binding, and if it is a menu item add it
+        to this menu.  */
+       item = XCAR (tail);
+       if (CONSP (item))
+       single_menu_item (XCAR (item), XCDR (item),
+                         &pending_maps, notreal, maxdepth);
+       else if (VECTORP (item))
+       {
+         /* Loop over the char values represented in the vector.  */
+         int len = XVECTOR (item)->size;
+         int c;
+         for (c = 0; c < len; c++)
+           {
+             Lisp_Object character;
+             XSETFASTINT (character, c);
+             single_menu_item (character, XVECTOR (item)->contents[c],
+                               &pending_maps, notreal, maxdepth);
+           }
+       }
+       UNGCPRO;
+     }
+ 
+   /* Process now any submenus which want to be panes at this level.  */
+   while (!NILP (pending_maps))
+     {
+       Lisp_Object elt, eltcdr, string;
+       elt = Fcar (pending_maps);
+       eltcdr = XCDR (elt);
+       string = XCAR (eltcdr);
+       /* We no longer discard the @ from the beginning of the string here.
+        Instead, we do this in mac_menu_show.  */
+       single_keymap_panes (Fcar (elt), string,
+                          XCDR (eltcdr), notreal, maxdepth - 1);
+       pending_maps = Fcdr (pending_maps);
+     }
+ }
+ 
+ /* This is a subroutine of single_keymap_panes that handles one
+    keymap entry.
+    KEY is a key in a keymap and ITEM is its binding.
+    PENDING_MAPS_PTR points to a list of keymaps waiting to be made into
+    separate panes.
+    If NOTREAL is nonzero, only check for equivalent key bindings, don't
+    evaluate expressions in menu items and don't make any menu.
+    If we encounter submenus deeper than MAXDEPTH levels, ignore them.  */
+ 
+ static void
+ single_menu_item (key, item, pending_maps_ptr, notreal, maxdepth)
+      Lisp_Object key, item;
+      Lisp_Object *pending_maps_ptr;
+      int maxdepth, notreal;
+ {
+   Lisp_Object map, item_string, enabled;
+   struct gcpro gcpro1, gcpro2;
+   int res;
+ 
+   /* Parse the menu item and leave the result in item_properties.  */
+   GCPRO2 (key, item);
+   res = parse_menu_item (item, notreal, 0);
+   UNGCPRO;
+   if (!res)
+     return;                   /* Not a menu item.  */
+ 
+   map = XVECTOR (item_properties)->contents[ITEM_PROPERTY_MAP];
+ 
+   if (notreal)
+     {
+       /* We don't want to make a menu, just traverse the keymaps to
+        precompute equivalent key bindings.  */
+       if (!NILP (map))
+       single_keymap_panes (map, Qnil, key, 1, maxdepth - 1);
+       return;
+     }
+ 
+   enabled = XVECTOR (item_properties)->contents[ITEM_PROPERTY_ENABLE];
+   item_string = XVECTOR (item_properties)->contents[ITEM_PROPERTY_NAME];
+ 
+   if (!NILP (map) && SREF (item_string, 0) == '@')
+     {
+       if (!NILP (enabled))
+       /* An enabled separate pane. Remember this to handle it later.  */
+       *pending_maps_ptr = Fcons (Fcons (map, Fcons (item_string, key)),
+                                  *pending_maps_ptr);
+       return;
+     }
+ 
+   push_menu_item (item_string, enabled, key,
+                 XVECTOR (item_properties)->contents[ITEM_PROPERTY_DEF],
+                 XVECTOR (item_properties)->contents[ITEM_PROPERTY_KEYEQ],
+                 XVECTOR (item_properties)->contents[ITEM_PROPERTY_TYPE],
+                   XVECTOR (item_properties)->contents[ITEM_PROPERTY_SELECTED],
+                   XVECTOR (item_properties)->contents[ITEM_PROPERTY_HELP]);
+ 
+   /* Display a submenu using the toolkit.  */
+   if (! (NILP (map) || NILP (enabled)))
+     {
+       push_submenu_start ();
+       single_keymap_panes (map, Qnil, key, 0, maxdepth - 1);
+       push_submenu_end ();
+     }
+ }
+ 
+ /* Push all the panes and items of a menu described by the
+    alist-of-alists MENU.
+    This handles old-fashioned calls to x-popup-menu.  */
+ 
+ static void
+ list_of_panes (menu)
+      Lisp_Object menu;
+ {
+   Lisp_Object tail;
+ 
+   init_menu_items ();
+ 
+   for (tail = menu; !NILP (tail); tail = Fcdr (tail))
+     {
+       Lisp_Object elt, pane_name, pane_data;
+       elt = Fcar (tail);
+       pane_name = Fcar (elt);
+       CHECK_STRING (pane_name);
+       push_menu_pane (pane_name, Qnil);
+       pane_data = Fcdr (elt);
+       CHECK_CONS (pane_data);
+       list_of_items (pane_data);
+     }
+ 
+   finish_menu_items ();
+ }
+ 
+ /* Push the items in a single pane defined by the alist PANE.  */
+ 
+ static void
+ list_of_items (pane)
+      Lisp_Object pane;
+ {
+   Lisp_Object tail, item, item1;
+ 
+   for (tail = pane; !NILP (tail); tail = Fcdr (tail))
+     {
+       item = Fcar (tail);
+       if (STRINGP (item))
+       push_menu_item (item, Qnil, Qnil, Qt, Qnil, Qnil, Qnil, Qnil);
+       else if (NILP (item))
+       push_left_right_boundary ();
+       else
+       {
+         CHECK_CONS (item);
+         item1 = Fcar (item);
+         CHECK_STRING (item1);
+         push_menu_item (item1, Qt, Fcdr (item), Qt, Qnil, Qnil, Qnil, Qnil);
+       }
+     }
+ }
+ 
+ DEFUN ("x-popup-menu", Fx_popup_menu, Sx_popup_menu, 2, 2, 0,
+        doc: /* Pop up a deck-of-cards menu and return user's selection.
+ POSITION is a position specification.  This is either a mouse button
+ event or a list ((XOFFSET YOFFSET) WINDOW) where XOFFSET and YOFFSET
+ are positions in pixels from the top left corner of WINDOW's frame
+ \(WINDOW may be a frame object instead of a window).  This controls the
+ position of the center of the first line in the first pane of the
+ menu, not the top left of the menu as a whole.  If POSITION is t, it
+ means to use the current mouse position.
+ 
+ MENU is a specifier for a menu.  For the simplest case, MENU is a keymap.
+ The menu items come from key bindings that have a menu string as well as
+ a definition; actually, the \"definition\" in such a key binding looks like
+ \(STRING . REAL-DEFINITION).  To give the menu a title, put a string into
+ the keymap as a top-level element.
+ 
+ If REAL-DEFINITION is nil, that puts a nonselectable string in the menu.
+ Otherwise, REAL-DEFINITION should be a valid key binding definition.
+ 
+ You can also use a list of keymaps as MENU.  Then each keymap makes a
+ separate pane.  When MENU is a keymap or a list of keymaps, the return
+ value is a list of events.
+ 
+ Alternatively, you can specify a menu of multiple panes with a list of
+ the form (TITLE PANE1 PANE2...), where each pane is a list of
+ form (TITLE ITEM1 ITEM2...).
+ Each ITEM is normally a cons cell (STRING . VALUE); but a string can
+ appear as an item--that makes a nonselectable line in the menu.
+ With this form of menu, the return value is VALUE from the chosen item.
+ 
+ If POSITION is nil, don't display the menu at all, just precalculate the
+ cached information about equivalent key sequences.  */)
+   (position, menu)
+      Lisp_Object position, menu;
+ {
+   Lisp_Object keymap, tem;
+   int xpos = 0, ypos = 0;
+   Lisp_Object title;
+   char *error_name;
+   Lisp_Object selection;
+   FRAME_PTR f = NULL;
+   Lisp_Object x, y, window;
+   int keymaps = 0;
+   int for_click = 0;
+   struct gcpro gcpro1;
+ 
+ #ifdef HAVE_MENUS
+   if (! NILP (position))
+     {
+       check_mac ();
+ 
+       /* Decode the first argument: find the window and the coordinates.  */
+       if (EQ (position, Qt)
+         || (CONSP (position) && (EQ (XCAR (position), Qmenu_bar)
+                                    || EQ (XCAR (position), Qtool_bar))))
+       {
+         /* Use the mouse's current position.  */
+         FRAME_PTR new_f = SELECTED_FRAME ();
+         Lisp_Object bar_window;
+         enum scroll_bar_part part;
+         unsigned long time;
+ 
+         if (mouse_position_hook)
+           (*mouse_position_hook) (&new_f, 1, &bar_window,
+                                   &part, &x, &y, &time);
+         if (new_f != 0)
+           XSETFRAME (window, new_f);
+         else
+           {
+             window = selected_window;
+             XSETFASTINT (x, 0);
+             XSETFASTINT (y, 0);
+           }
+       }
+       else
+       {
+         tem = Fcar (position);
+         if (CONSP (tem))
+           {
+             window = Fcar (Fcdr (position));
+             x = Fcar (tem);
+             y = Fcar (Fcdr (tem));
+           }
+         else
+           {
+             for_click = 1;
+             tem = Fcar (Fcdr (position));  /* EVENT_START (position) */
+             window = Fcar (tem);           /* POSN_WINDOW (tem) */
+             tem = Fcar (Fcdr (Fcdr (tem))); /* POSN_WINDOW_POSN (tem) */
+             x = Fcar (tem);
+             y = Fcdr (tem);
+           }
+       }
+ 
+       CHECK_NUMBER (x);
+       CHECK_NUMBER (y);
+ 
+       /* Decode where to put the menu.  */
+ 
+       if (FRAMEP (window))
+       {
+         f = XFRAME (window);
+         xpos = 0;
+         ypos = 0;
+       }
+       else if (WINDOWP (window))
+       {
+         CHECK_LIVE_WINDOW (window);
+         f = XFRAME (WINDOW_FRAME (XWINDOW (window)));
+ 
+         xpos = WINDOW_LEFT_EDGE_X (XWINDOW (window));
+         ypos = WINDOW_TOP_EDGE_Y (XWINDOW (window));
+       }
+       else
+       /* ??? Not really clean; should be CHECK_WINDOW_OR_FRAME,
+          but I don't want to make one now.  */
+       CHECK_WINDOW (window);
+ 
+       xpos += XINT (x);
+       ypos += XINT (y);
+ 
+       XSETFRAME (Vmenu_updating_frame, f);
+     }
+   Vmenu_updating_frame = Qnil;
+ #endif /* HAVE_MENUS */
+ 
+   title = Qnil;
+   GCPRO1 (title);
+ 
+   /* Decode the menu items from what was specified.  */
+ 
+   keymap = get_keymap (menu, 0, 0);
+   if (CONSP (keymap))
+     {
+       /* We were given a keymap.  Extract menu info from the keymap.  */
+       Lisp_Object prompt;
+ 
+       /* Extract the detailed info to make one pane.  */
+       keymap_panes (&menu, 1, NILP (position));
+ 
+       /* Search for a string appearing directly as an element of the keymap.
+        That string is the title of the menu.  */
+       prompt = Fkeymap_prompt (keymap);
+       if (NILP (title) && !NILP (prompt))
+       title = prompt;
+ 
+       /* Make that be the pane title of the first pane.  */
+       if (!NILP (prompt) && menu_items_n_panes >= 0)
+       XVECTOR (menu_items)->contents[MENU_ITEMS_PANE_NAME] = prompt;
+ 
+       keymaps = 1;
+     }
+   else if (CONSP (menu) && KEYMAPP (XCAR (menu)))
+     {
+       /* We were given a list of keymaps.  */
+       int nmaps = XFASTINT (Flength (menu));
+       Lisp_Object *maps
+       = (Lisp_Object *) alloca (nmaps * sizeof (Lisp_Object));
+       int i;
+ 
+       title = Qnil;
+ 
+       /* The first keymap that has a prompt string
+        supplies the menu title.  */
+       for (tem = menu, i = 0; CONSP (tem); tem = Fcdr (tem))
+       {
+         Lisp_Object prompt;
+ 
+         maps[i++] = keymap = get_keymap (Fcar (tem), 1, 0);
+ 
+         prompt = Fkeymap_prompt (keymap);
+         if (NILP (title) && !NILP (prompt))
+           title = prompt;
+       }
+ 
+       /* Extract the detailed info to make one pane.  */
+       keymap_panes (maps, nmaps, NILP (position));
+ 
+       /* Make the title be the pane title of the first pane.  */
+       if (!NILP (title) && menu_items_n_panes >= 0)
+       XVECTOR (menu_items)->contents[MENU_ITEMS_PANE_NAME] = title;
+ 
+       keymaps = 1;
+     }
+   else
+     {
+       /* We were given an old-fashioned menu.  */
+       title = Fcar (menu);
+       CHECK_STRING (title);
+ 
+       list_of_panes (Fcdr (menu));
+ 
+       keymaps = 0;
+     }
+ 
+   if (NILP (position))
+     {
+       discard_menu_items ();
+       UNGCPRO;
+       return Qnil;
+     }
+ 
+ #ifdef HAVE_MENUS
+   /* Display them in a menu.  */
+   BLOCK_INPUT;
+ 
+   selection = mac_menu_show (f, xpos, ypos, for_click,
+                            keymaps, title, &error_name);
+   UNBLOCK_INPUT;
+ 
+   discard_menu_items ();
+ 
+   UNGCPRO;
+ #endif /* HAVE_MENUS */
+ 
+   if (error_name) error (error_name);
+   return selection;
+ }
+ 
+ #ifdef HAVE_MENUS
+ 
+ DEFUN ("x-popup-dialog", Fx_popup_dialog, Sx_popup_dialog, 2, 2, 0,
+        doc: /* Pop up a dialog box and return user's selection.
+ POSITION specifies which frame to use.
+ This is normally a mouse button event or a window or frame.
+ If POSITION is t, it means to use the frame the mouse is on.
+ The dialog box appears in the middle of the specified frame.
+ 
+ CONTENTS specifies the alternatives to display in the dialog box.
+ It is a list of the form (TITLE ITEM1 ITEM2...).
+ Each ITEM is a cons cell (STRING . VALUE).
+ The return value is VALUE from the chosen item.
+ 
+ An ITEM may also be just a string--that makes a nonselectable item.
+ An ITEM may also be nil--that means to put all preceding items
+ on the left of the dialog box and all following items on the right.
+ \(By default, approximately half appear on each side.)  */)
+   (position, contents)
+      Lisp_Object position, contents;
+ {
+   FRAME_PTR f = NULL;
+   Lisp_Object window;
+ 
+   check_mac ();
+ 
+   /* Decode the first argument: find the window or frame to use.  */
+   if (EQ (position, Qt)
+       || (CONSP (position) && (EQ (XCAR (position), Qmenu_bar)
+                                || EQ (XCAR (position), Qtool_bar))))
+     {
+ #if 0 /* Using the frame the mouse is on may not be right.  */
+       /* Use the mouse's current position.  */
+       FRAME_PTR new_f = SELECTED_FRAME ();
+       Lisp_Object bar_window;
+       enum scroll_bar_part part;
+       unsigned long time;
+       Lisp_Object x, y;
+ 
+       (*mouse_position_hook) (&new_f, 1, &bar_window, &part, &x, &y, &time);
+ 
+       if (new_f != 0)
+       XSETFRAME (window, new_f);
+       else
+       window = selected_window;
+ #endif
+       window = selected_window;
+     }
+   else if (CONSP (position))
+     {
+       Lisp_Object tem;
+       tem = Fcar (position);
+       if (CONSP (tem))
+       window = Fcar (Fcdr (position));
+       else
+       {
+         tem = Fcar (Fcdr (position));  /* EVENT_START (position) */
+         window = Fcar (tem);       /* POSN_WINDOW (tem) */
+       }
+     }
+   else if (WINDOWP (position) || FRAMEP (position))
+     window = position;
+   else
+     window = Qnil;
+ 
+   /* Decode where to put the menu.  */
+ 
+   if (FRAMEP (window))
+     f = XFRAME (window);
+   else if (WINDOWP (window))
+     {
+       CHECK_LIVE_WINDOW (window);
+       f = XFRAME (WINDOW_FRAME (XWINDOW (window)));
+     }
+   else
+     /* ??? Not really clean; should be CHECK_WINDOW_OR_FRAME,
+        but I don't want to make one now.  */
+     CHECK_WINDOW (window);
+ 
+ #ifndef HAVE_DIALOGS
+   /* Display a menu with these alternatives
+      in the middle of frame F.  */
+   {
+     Lisp_Object x, y, frame, newpos;
+     XSETFRAME (frame, f);
+     XSETINT (x, x_pixel_width (f) / 2);
+     XSETINT (y, x_pixel_height (f) / 2);
+     newpos = Fcons (Fcons (x, Fcons (y, Qnil)), Fcons (frame, Qnil));
+ 
+     return Fx_popup_menu (newpos,
+                         Fcons (Fcar (contents), Fcons (contents, Qnil)));
+   }
+ #else /* HAVE_DIALOGS */
+   {
+     Lisp_Object title;
+     char *error_name;
+     Lisp_Object selection;
+ 
+     /* Decode the dialog items from what was specified.  */
+     title = Fcar (contents);
+     CHECK_STRING (title);
+ 
+     list_of_panes (Fcons (contents, Qnil));
+ 
+     /* Display them in a dialog box.  */
+     BLOCK_INPUT;
+     selection = mac_dialog_show (f, 0, title, &error_name);
+     UNBLOCK_INPUT;
+ 
+     discard_menu_items ();
+ 
+     if (error_name) error (error_name);
+     return selection;
+   }
+ #endif /* HAVE_DIALOGS */
+ }
+ 
+ /* Activate the menu bar of frame F.
+    This is called from keyboard.c when it gets the
+    MENU_BAR_ACTIVATE_EVENT out of the Emacs event queue.
+ 
+    To activate the menu bar, we signal to the input thread that it can
+    return from the WM_INITMENU message, allowing the normal Windows
+    processing of the menus.
+ 
+    But first we recompute the menu bar contents (the whole tree).
+ 
+    This way we can safely execute Lisp code.  */
+ 
+ void
+ x_activate_menubar (f)
+      FRAME_PTR f;
+ {
+   SInt32 menu_choice;
+   extern Point saved_menu_event_location;
+ 
+   set_frame_menubar (f, 0, 1);
+   BLOCK_INPUT;
+ 
+   menu_choice = MenuSelect (saved_menu_event_location);
+   do_menu_choice (menu_choice);
+ 
+   UNBLOCK_INPUT;
+ }
+ 
+ /* This callback is called from the menu bar pulldown menu
+    when the user makes a selection.
+    Figure out what the user chose
+    and put the appropriate events into the keyboard buffer.  */
+ 
+ void
+ menubar_selection_callback (FRAME_PTR f, int client_data)
+ {
+   Lisp_Object prefix, entry;
+   Lisp_Object vector;
+   Lisp_Object *subprefix_stack;
+   int submenu_depth = 0;
+   int i;
+ 
+   if (!f)
+     return;
+   entry = Qnil;
+   subprefix_stack = (Lisp_Object *) alloca (f->menu_bar_items_used * sizeof 
(Lisp_Object));
+   vector = f->menu_bar_vector;
+   prefix = Qnil;
+   i = 0;
+   while (i < f->menu_bar_items_used)
+     {
+       if (EQ (XVECTOR (vector)->contents[i], Qnil))
+       {
+         subprefix_stack[submenu_depth++] = prefix;
+         prefix = entry;
+         i++;
+       }
+       else if (EQ (XVECTOR (vector)->contents[i], Qlambda))
+       {
+         prefix = subprefix_stack[--submenu_depth];
+         i++;
+       }
+       else if (EQ (XVECTOR (vector)->contents[i], Qt))
+       {
+         prefix = XVECTOR (vector)->contents[i + MENU_ITEMS_PANE_PREFIX];
+         i += MENU_ITEMS_PANE_LENGTH;
+       }
+       else
+       {
+         entry = XVECTOR (vector)->contents[i + MENU_ITEMS_ITEM_VALUE];
+         /* The EMACS_INT cast avoids a warning.  There's no problem
+            as long as pointers have enough bits to hold small integers.  */
+         if ((int) (EMACS_INT) client_data == i)
+           {
+             int j;
+             struct input_event buf;
+             Lisp_Object frame;
+             EVENT_INIT (buf);
+ 
+             XSETFRAME (frame, f);
+             buf.kind = MENU_BAR_EVENT;
+             buf.frame_or_window = frame;
+             buf.arg = frame;
+             kbd_buffer_store_event (&buf);
+ 
+             for (j = 0; j < submenu_depth; j++)
+               if (!NILP (subprefix_stack[j]))
+                 {
+                   buf.kind = MENU_BAR_EVENT;
+                   buf.frame_or_window = frame;
+                   buf.arg = subprefix_stack[j];
+                   kbd_buffer_store_event (&buf);
+                 }
+ 
+             if (!NILP (prefix))
+               {
+                 buf.kind = MENU_BAR_EVENT;
+                 buf.frame_or_window = frame;
+                 buf.arg = prefix;
+                 kbd_buffer_store_event (&buf);
+               }
+ 
+             buf.kind = MENU_BAR_EVENT;
+             buf.frame_or_window = frame;
+             buf.arg = entry;
+             kbd_buffer_store_event (&buf);
+ 
+             f->output_data.mac->menu_command_in_progress = 0;
+             f->output_data.mac->menubar_active = 0;
+             return;
+           }
+         i += MENU_ITEMS_ITEM_LENGTH;
+       }
+     }
+   f->output_data.mac->menu_command_in_progress = 0;
+   f->output_data.mac->menubar_active = 0;
+ }
+ 
+ /* Allocate a widget_value, blocking input.  */
+ 
+ widget_value *
+ xmalloc_widget_value ()
+ {
+   widget_value *value;
+ 
+   BLOCK_INPUT;
+   value = malloc_widget_value ();
+   UNBLOCK_INPUT;
+ 
+   return value;
+ }
+ 
+ /* This recursively calls free_widget_value on the tree of widgets.
+    It must free all data that was malloc'ed for these widget_values.
+    In Emacs, many slots are pointers into the data of Lisp_Strings, and
+    must be left alone.  */
+ 
+ void
+ free_menubar_widget_value_tree (wv)
+      widget_value *wv;
+ {
+   if (! wv) return;
+ 
+   wv->name = wv->value = wv->key = (char *) 0xDEADBEEF;
+ 
+   if (wv->contents && (wv->contents != (widget_value*)1))
+     {
+       free_menubar_widget_value_tree (wv->contents);
+       wv->contents = (widget_value *) 0xDEADBEEF;
+     }
+   if (wv->next)
+     {
+       free_menubar_widget_value_tree (wv->next);
+       wv->next = (widget_value *) 0xDEADBEEF;
+     }
+   BLOCK_INPUT;
+   free_widget_value (wv);
+   UNBLOCK_INPUT;
+ }
+ 
+ /* Return a tree of widget_value structures for a menu bar item
+    whose event type is ITEM_KEY (with string ITEM_NAME)
+    and whose contents come from the list of keymaps MAPS.  */
+ 
+ static widget_value *
+ single_submenu (item_key, item_name, maps)
+      Lisp_Object item_key, item_name, maps;
+ {
+   widget_value *wv, *prev_wv, *save_wv, *first_wv;
+   int i;
+   int submenu_depth = 0;
+   Lisp_Object length;
+   int len;
+   Lisp_Object *mapvec;
+   widget_value **submenu_stack;
+   int previous_items = menu_items_used;
+   int top_level_items = 0;
+ 
+   length = Flength (maps);
+   len = XINT (length);
+ 
+   /* Convert the list MAPS into a vector MAPVEC.  */
+   mapvec = (Lisp_Object *) alloca (len * sizeof (Lisp_Object));
+   for (i = 0; i < len; i++)
+     {
+       mapvec[i] = Fcar (maps);
+       maps = Fcdr (maps);
+     }
+ 
+   menu_items_n_panes = 0;
+ 
+   /* Loop over the given keymaps, making a pane for each map.
+      But don't make a pane that is empty--ignore that map instead.  */
+   for (i = 0; i < len; i++)
+     {
+       if (SYMBOLP (mapvec[i])
+         || (CONSP (mapvec[i]) && !KEYMAPP (mapvec[i])))
+       {
+         /* Here we have a command at top level in the menu bar
+            as opposed to a submenu.  */
+         top_level_items = 1;
+         push_menu_pane (Qnil, Qnil);
+         push_menu_item (item_name, Qt, item_key, mapvec[i],
+                           Qnil, Qnil, Qnil, Qnil);
+       }
+       else
+       single_keymap_panes (mapvec[i], item_name, item_key, 0, 10);
+     }
+ 
+   /* Create a tree of widget_value objects
+      representing the panes and their items.  */
+ 
+   submenu_stack
+     = (widget_value **) alloca (menu_items_used * sizeof (widget_value *));
+   wv = xmalloc_widget_value ();
+   wv->name = "menu";
+   wv->value = 0;
+   wv->enabled = 1;
+   wv->button_type = BUTTON_TYPE_NONE;
+   wv->help = Qnil;
+   first_wv = wv;
+   save_wv = 0;
+   prev_wv = 0;
+ 
+   /* Loop over all panes and items made during this call
+      and construct a tree of widget_value objects.
+      Ignore the panes and items made by previous calls to
+      single_submenu, even though those are also in menu_items.  */
+   i = previous_items;
+   while (i < menu_items_used)
+     {
+       if (EQ (XVECTOR (menu_items)->contents[i], Qnil))
+       {
+         submenu_stack[submenu_depth++] = save_wv;
+         save_wv = prev_wv;
+         prev_wv = 0;
+         i++;
+       }
+       else if (EQ (XVECTOR (menu_items)->contents[i], Qlambda))
+       {
+         prev_wv = save_wv;
+         save_wv = submenu_stack[--submenu_depth];
+         i++;
+       }
+       else if (EQ (XVECTOR (menu_items)->contents[i], Qt)
+              && submenu_depth != 0)
+       i += MENU_ITEMS_PANE_LENGTH;
+       /* Ignore a nil in the item list.
+        It's meaningful only for dialog boxes.  */
+       else if (EQ (XVECTOR (menu_items)->contents[i], Qquote))
+       i += 1;
+       else if (EQ (XVECTOR (menu_items)->contents[i], Qt))
+       {
+         /* Create a new pane.  */
+         Lisp_Object pane_name, prefix;
+         char *pane_string;
+ 
+         pane_name = XVECTOR (menu_items)->contents[i + MENU_ITEMS_PANE_NAME];
+         prefix = XVECTOR (menu_items)->contents[i + MENU_ITEMS_PANE_PREFIX];
+ 
+ #ifndef HAVE_MULTILINGUAL_MENU
+         if (STRINGP (pane_name) && STRING_MULTIBYTE (pane_name))
+           {
+             pane_name = ENCODE_SYSTEM (pane_name);
+             AREF (menu_items, i + MENU_ITEMS_PANE_NAME) = pane_name;
+           }
+ #endif
+         pane_string = (NILP (pane_name)
+                        ? "" : (char *) SDATA (pane_name));
+         /* If there is just one top-level pane, put all its items directly
+            under the top-level menu.  */
+         if (menu_items_n_panes == 1)
+           pane_string = "";
+ 
+         /* If the pane has a meaningful name,
+            make the pane a top-level menu item
+            with its items as a submenu beneath it.  */
+         if (strcmp (pane_string, ""))
+           {
+             wv = xmalloc_widget_value ();
+             if (save_wv)
+               save_wv->next = wv;
+             else
+               first_wv->contents = wv;
+             wv->lname = pane_name;
+               /* Set value to 1 so update_submenu_strings can handle '@'  */
+             wv->value = (char *)1;
+             wv->enabled = 1;
+             wv->button_type = BUTTON_TYPE_NONE;
+             wv->help = Qnil;
+           }
+         save_wv = wv;
+         prev_wv = 0;
+         i += MENU_ITEMS_PANE_LENGTH;
+       }
+       else
+       {
+         /* Create a new item within current pane.  */
+         Lisp_Object item_name, enable, descrip, def, type, selected;
+           Lisp_Object help;
+ 
+         item_name = AREF (menu_items, i + MENU_ITEMS_ITEM_NAME);
+         enable = AREF (menu_items, i + MENU_ITEMS_ITEM_ENABLE);
+         descrip = AREF (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY);
+         def = AREF (menu_items, i + MENU_ITEMS_ITEM_DEFINITION);
+         type = AREF (menu_items, i + MENU_ITEMS_ITEM_TYPE);
+         selected = AREF (menu_items, i + MENU_ITEMS_ITEM_SELECTED);
+         help = AREF (menu_items, i + MENU_ITEMS_ITEM_HELP);
+ 
+ #ifndef HAVE_MULTILINGUAL_MENU
+         if (STRING_MULTIBYTE (item_name))
+           {
+             item_name = ENCODE_MENU_STRING (item_name);
+             AREF (menu_items, i + MENU_ITEMS_ITEM_NAME) = item_name;
+           }
+ 
+         if (STRINGP (descrip) && STRING_MULTIBYTE (descrip))
+           {
+             descrip = ENCODE_MENU_STRING (descrip);
+             AREF (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY) = descrip;
+           }
+ #endif /* not HAVE_MULTILINGUAL_MENU */
+ 
+         wv = xmalloc_widget_value ();
+         if (prev_wv)
+           prev_wv->next = wv;
+         else
+           save_wv->contents = wv;
+ 
+         wv->lname = item_name;
+         if (!NILP (descrip))
+           wv->lkey = descrip;
+         wv->value = 0;
+         /* The EMACS_INT cast avoids a warning.  There's no problem
+            as long as pointers have enough bits to hold small integers.  */
+         wv->call_data = (!NILP (def) ? (void *) (EMACS_INT) i : 0);
+         wv->enabled = !NILP (enable);
+ 
+         if (NILP (type))
+           wv->button_type = BUTTON_TYPE_NONE;
+         else if (EQ (type, QCradio))
+           wv->button_type = BUTTON_TYPE_RADIO;
+         else if (EQ (type, QCtoggle))
+           wv->button_type = BUTTON_TYPE_TOGGLE;
+         else
+           abort ();
+ 
+         wv->selected = !NILP (selected);
+         if (!STRINGP (help))
+           help = Qnil;
+ 
+         wv->help = help;
+ 
+         prev_wv = wv;
+ 
+         i += MENU_ITEMS_ITEM_LENGTH;
+       }
+     }
+ 
+   /* If we have just one "menu item"
+      that was originally a button, return it by itself.  */
+   if (top_level_items && first_wv->contents && first_wv->contents->next == 0)
+     {
+       wv = first_wv->contents;
+       free_widget_value (first_wv);
+       return wv;
+     }
+ 
+   return first_wv;
+ }
+ /* Walk through the widget_value tree starting at FIRST_WV and update
+    the char * pointers from the corresponding lisp values.
+    We do this after building the whole tree, since GC may happen while the
+    tree is constructed, and small strings are relocated.  So we must wait
+    until no GC can happen before storing pointers into lisp values.  */
+ static void
+ update_submenu_strings (first_wv)
+      widget_value *first_wv;
+ {
+   widget_value *wv;
+ 
+   for (wv = first_wv; wv; wv = wv->next)
+     {
+       if (wv->lname && ! NILP (wv->lname))
+         {
+           wv->name = SDATA (wv->lname);
+ 
+           /* Ignore the @ that means "separate pane".
+              This is a kludge, but this isn't worth more time.  */
+           if (wv->value == (char *)1)
+             {
+               if (wv->name[0] == '@')
+               wv->name++;
+               wv->value = 0;
+             }
+         }
+ 
+       if (wv->lkey && ! NILP (wv->lkey))
+         wv->key = SDATA (wv->lkey);
+ 
+       if (wv->contents)
+         update_submenu_strings (wv->contents);
+     }
+ }
+ 
+ 
+ /* Set the contents of the menubar widgets of frame F.
+    The argument FIRST_TIME is currently ignored;
+    it is set the first time this is called, from initialize_frame_menubar.  */
+ 
+ void
+ set_frame_menubar (f, first_time, deep_p)
+      FRAME_PTR f;
+      int first_time;
+      int deep_p;
+ {
+   int menubar_widget = f->output_data.mac->menubar_widget;
+   Lisp_Object items;
+   widget_value *wv, *first_wv, *prev_wv = 0;
+   int i;
+ 
+   /* We must not change the menubar when actually in use.  */
+   if (f->output_data.mac->menubar_active)
+     return;
+ 
+   XSETFRAME (Vmenu_updating_frame, f);
+ 
+   if (! menubar_widget)
+     deep_p = 1;
+   else if (pending_menu_activation && !deep_p)
+     deep_p = 1;
+ 
+   wv = xmalloc_widget_value ();
+   wv->name = "menubar";
+   wv->value = 0;
+   wv->enabled = 1;
+   wv->button_type = BUTTON_TYPE_NONE;
+   wv->help = Qnil;
+   first_wv = wv;
+ 
+   if (deep_p)
+     {
+       /* Make a widget-value tree representing the entire menu trees.  */
+ 
+       struct buffer *prev = current_buffer;
+       Lisp_Object buffer;
+       int specpdl_count = SPECPDL_INDEX ();
+       int previous_menu_items_used = f->menu_bar_items_used;
+       Lisp_Object *previous_items
+       = (Lisp_Object *) alloca (previous_menu_items_used
+                                 * sizeof (Lisp_Object));
+ 
+       /* If we are making a new widget, its contents are empty,
+        do always reinitialize them.  */
+       if (! menubar_widget)
+       previous_menu_items_used = 0;
+ 
+       buffer = XWINDOW (FRAME_SELECTED_WINDOW (f))->buffer;
+       specbind (Qinhibit_quit, Qt);
+       /* Don't let the debugger step into this code
+        because it is not reentrant.  */
+       specbind (Qdebug_on_next_call, Qnil);
+ 
+       record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil));
+       if (NILP (Voverriding_local_map_menu_flag))
+       {
+         specbind (Qoverriding_terminal_local_map, Qnil);
+         specbind (Qoverriding_local_map, Qnil);
+       }
+ 
+       set_buffer_internal_1 (XBUFFER (buffer));
+ 
+       /* Run the Lucid hook.  */
+       safe_run_hooks (Qactivate_menubar_hook);
+       /* If it has changed current-menubar from previous value,
+        really recompute the menubar from the value.  */
+       if (! NILP (Vlucid_menu_bar_dirty_flag))
+       call0 (Qrecompute_lucid_menubar);
+       safe_run_hooks (Qmenu_bar_update_hook);
+       FRAME_MENU_BAR_ITEMS (f) = menu_bar_items (FRAME_MENU_BAR_ITEMS (f));
+ 
+       items = FRAME_MENU_BAR_ITEMS (f);
+ 
+       /* Save the frame's previous menu bar contents data.  */
+       if (previous_menu_items_used)
+       bcopy (XVECTOR (f->menu_bar_vector)->contents, previous_items,
+              previous_menu_items_used * sizeof (Lisp_Object));
+ 
+       /* Fill in the current menu bar contents.  */
+       menu_items = f->menu_bar_vector;
+       menu_items_allocated = VECTORP (menu_items) ? ASIZE (menu_items) : 0;
+       init_menu_items ();
+       for (i = 0; i < XVECTOR (items)->size; i += 4)
+       {
+         Lisp_Object key, string, maps;
+ 
+         key = XVECTOR (items)->contents[i];
+         string = XVECTOR (items)->contents[i + 1];
+         maps = XVECTOR (items)->contents[i + 2];
+         if (NILP (string))
+           break;
+ 
+         wv = single_submenu (key, string, maps);
+         if (prev_wv)
+           prev_wv->next = wv;
+         else
+           first_wv->contents = wv;
+         /* Don't set wv->name here; GC during the loop might relocate it.  */
+         wv->enabled = 1;
+         wv->button_type = BUTTON_TYPE_NONE;
+         prev_wv = wv;
+       }
+ 
+       finish_menu_items ();
+ 
+       set_buffer_internal_1 (prev);
+       unbind_to (specpdl_count, Qnil);
+ 
+       /* If there has been no change in the Lisp-level contents
+        of the menu bar, skip redisplaying it.  Just exit.  */
+ 
+       for (i = 0; i < previous_menu_items_used; i++)
+       if (menu_items_used == i
+           || (NILP (Fequal (previous_items[i],
+                             XVECTOR (menu_items)->contents[i]))))
+         break;
+       if (i == menu_items_used && i == previous_menu_items_used && i != 0)
+       {
+         free_menubar_widget_value_tree (first_wv);
+         menu_items = Qnil;
+ 
+         return;
+       }
+ 
+       /* Now GC cannot happen during the lifetime of the widget_value,
+        so it's safe to store data from a Lisp_String, as long as
+        local copies are made when the actual menu is created.
+        Windows takes care of this for normal string items, but
+        not for owner-drawn items or additional item-info.  */
+       wv = first_wv->contents;
+       for (i = 0; i < XVECTOR (items)->size; i += 4)
+       {
+         Lisp_Object string;
+         string = XVECTOR (items)->contents[i + 1];
+         if (NILP (string))
+           break;
+         wv->name = (char *) SDATA (string);
+           update_submenu_strings (wv->contents);
+         wv = wv->next;
+       }
+ 
+       f->menu_bar_vector = menu_items;
+       f->menu_bar_items_used = menu_items_used;
+       menu_items = Qnil;
+     }
+   else
+     {
+       /* Make a widget-value tree containing
+        just the top level menu bar strings.  */
+ 
+       items = FRAME_MENU_BAR_ITEMS (f);
+       for (i = 0; i < XVECTOR (items)->size; i += 4)
+       {
+         Lisp_Object string;
+ 
+         string = XVECTOR (items)->contents[i + 1];
+         if (NILP (string))
+           break;
+ 
+         wv = xmalloc_widget_value ();
+         wv->name = (char *) SDATA (string);
+         wv->value = 0;
+         wv->enabled = 1;
+         wv->button_type = BUTTON_TYPE_NONE;
+         wv->help = Qnil;
+         /* This prevents lwlib from assuming this
+            menu item is really supposed to be empty.  */
+         /* The EMACS_INT cast avoids a warning.
+            This value just has to be different from small integers.  */
+         wv->call_data = (void *) (EMACS_INT) (-1);
+ 
+         if (prev_wv)
+           prev_wv->next = wv;
+         else
+           first_wv->contents = wv;
+         prev_wv = wv;
+       }
+ 
+       /* Forget what we thought we knew about what is in the
+        detailed contents of the menu bar menus.
+        Changing the top level always destroys the contents.  */
+       f->menu_bar_items_used = 0;
+     }
+ 
+   /* Create or update the menu bar widget.  */
+ 
+   BLOCK_INPUT;
+ 
+   /* Non-null value to indicate menubar has already been "created".  */
+   f->output_data.mac->menubar_widget = 1;
+ 
+   {
+     int i = MIN_MENU_ID;
+     MenuHandle menu = GetMenuHandle (i);
+     while (menu != NULL)
+       {
+       DeleteMenu (i);
+       DisposeMenu (menu);
+       menu = GetMenuHandle (++i);
+       }
+ 
+     i = MIN_SUBMENU_ID;
+     menu = GetMenuHandle (i);
+     while (menu != NULL)
+       {
+       DeleteMenu (i);
+       DisposeMenu (menu);
+       menu = GetMenuHandle (++i);
+       }
+   }
+ 
+   fill_menubar (first_wv->contents);
+ 
+   DrawMenuBar ();
+ 
+   free_menubar_widget_value_tree (first_wv);
+ 
+   UNBLOCK_INPUT;
+ }
+ 
+ /* Called from Fx_create_frame to create the initial menubar of a frame
+    before it is mapped, so that the window is mapped with the menubar already
+    there instead of us tacking it on later and thrashing the window after it
+    is visible.  */
+ 
+ void
+ initialize_frame_menubar (f)
+      FRAME_PTR f;
+ {
+   /* This function is called before the first chance to redisplay
+      the frame.  It has to be, so the frame will have the right size.  */
+   FRAME_MENU_BAR_ITEMS (f) = menu_bar_items (FRAME_MENU_BAR_ITEMS (f));
+   set_frame_menubar (f, 1, 1);
+ }
+ 
+ /* Get rid of the menu bar of frame F, and free its storage.
+    This is used when deleting a frame, and when turning off the menu bar.  */
+ 
+ void
+ free_frame_menubar (f)
+      FRAME_PTR f;
+ {
+   f->output_data.mac->menubar_widget = NULL;
+ }
+ 
+ 
+ /* mac_menu_show actually displays a menu using the panes and items in
+    menu_items and returns the value selected from it; we assume input
+    is blocked by the caller.  */
+ 
+ /* F is the frame the menu is for.
+    X and Y are the frame-relative specified position,
+    relative to the inside upper left corner of the frame F.
+    FOR_CLICK is nonzero if this menu was invoked for a mouse click.
+    KEYMAPS is 1 if this menu was specified with keymaps;
+     in that case, we return a list containing the chosen item's value
+     and perhaps also the pane's prefix.
+    TITLE is the specified menu title.
+    ERROR is a place to store an error message string in case of failure.
+    (We return nil on failure, but the value doesn't actually matter.)  */
+ 
+ static Lisp_Object
+ mac_menu_show (f, x, y, for_click, keymaps, title, error)
+      FRAME_PTR f;
+      int x;
+      int y;
+      int for_click;
+      int keymaps;
+      Lisp_Object title;
+      char **error;
+ {
+   int i;
+   UInt32 refcon;
+   int menu_item_choice;
+   int menu_item_selection;
+   MenuHandle menu;
+   Point pos;
+   widget_value *wv, *save_wv = 0, *first_wv = 0, *prev_wv = 0;
+   widget_value **submenu_stack
+     = (widget_value **) alloca (menu_items_used * sizeof (widget_value *));
+   Lisp_Object *subprefix_stack
+     = (Lisp_Object *) alloca (menu_items_used * sizeof (Lisp_Object));
+   int submenu_depth = 0;
+   int first_pane;
+ 
+   *error = NULL;
+ 
+   if (menu_items_used <= MENU_ITEMS_PANE_LENGTH)
+     {
+       *error = "Empty menu";
+       return Qnil;
+     }
+ 
+   /* Create a tree of widget_value objects
+      representing the panes and their items.  */
+   wv = xmalloc_widget_value ();
+   wv->name = "menu";
+   wv->value = 0;
+   wv->enabled = 1;
+   wv->button_type = BUTTON_TYPE_NONE;
+   wv->help = Qnil;
+   first_wv = wv;
+   first_pane = 1;
+ 
+   /* Loop over all panes and items, filling in the tree.  */
+   i = 0;
+   while (i < menu_items_used)
+     {
+       if (EQ (XVECTOR (menu_items)->contents[i], Qnil))
+       {
+         submenu_stack[submenu_depth++] = save_wv;
+         save_wv = prev_wv;
+         prev_wv = 0;
+         first_pane = 1;
+         i++;
+       }
+       else if (EQ (XVECTOR (menu_items)->contents[i], Qlambda))
+       {
+         prev_wv = save_wv;
+         save_wv = submenu_stack[--submenu_depth];
+         first_pane = 0;
+         i++;
+       }
+       else if (EQ (XVECTOR (menu_items)->contents[i], Qt)
+              && submenu_depth != 0)
+       i += MENU_ITEMS_PANE_LENGTH;
+       /* Ignore a nil in the item list.
+        It's meaningful only for dialog boxes.  */
+       else if (EQ (XVECTOR (menu_items)->contents[i], Qquote))
+       i += 1;
+       else if (EQ (XVECTOR (menu_items)->contents[i], Qt))
+       {
+         /* Create a new pane.  */
+         Lisp_Object pane_name, prefix;
+         char *pane_string;
+         pane_name = AREF (menu_items, i + MENU_ITEMS_PANE_NAME);
+         prefix = AREF (menu_items, i + MENU_ITEMS_PANE_PREFIX);
+ #ifndef HAVE_MULTILINGUAL_MENU
+         if (STRINGP (pane_name) && STRING_MULTIBYTE (pane_name))
+           {
+             pane_name = ENCODE_SYSTEM (pane_name);
+             AREF (menu_items, i + MENU_ITEMS_PANE_NAME) = pane_name;
+           }
+ #endif
+         pane_string = (NILP (pane_name)
+                        ? "" : (char *) SDATA (pane_name));
+         /* If there is just one top-level pane, put all its items directly
+            under the top-level menu.  */
+         if (menu_items_n_panes == 1)
+           pane_string = "";
+ 
+         /* If the pane has a meaningful name,
+            make the pane a top-level menu item
+            with its items as a submenu beneath it.  */
+         if (!keymaps && strcmp (pane_string, ""))
+           {
+             wv = xmalloc_widget_value ();
+             if (save_wv)
+               save_wv->next = wv;
+             else
+               first_wv->contents = wv;
+             wv->name = pane_string;
+             if (keymaps && !NILP (prefix))
+               wv->name++;
+             wv->value = 0;
+             wv->enabled = 1;
+             wv->button_type = BUTTON_TYPE_NONE;
+             wv->help = Qnil;
+             save_wv = wv;
+             prev_wv = 0;
+           }
+         else if (first_pane)
+           {
+             save_wv = wv;
+             prev_wv = 0;
+           }
+         first_pane = 0;
+         i += MENU_ITEMS_PANE_LENGTH;
+       }
+       else
+       {
+         /* Create a new item within current pane.  */
+         Lisp_Object item_name, enable, descrip, def, type, selected, help;
+ 
+         item_name = AREF (menu_items, i + MENU_ITEMS_ITEM_NAME);
+         enable = AREF (menu_items, i + MENU_ITEMS_ITEM_ENABLE);
+         descrip = AREF (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY);
+         def = AREF (menu_items, i + MENU_ITEMS_ITEM_DEFINITION);
+         type = AREF (menu_items, i + MENU_ITEMS_ITEM_TYPE);
+         selected = AREF (menu_items, i + MENU_ITEMS_ITEM_SELECTED);
+           help = AREF (menu_items, i + MENU_ITEMS_ITEM_HELP);
+ 
+ #ifndef HAVE_MULTILINGUAL_MENU
+           if (STRINGP (item_name) && STRING_MULTIBYTE (item_name))
+           {
+             item_name = ENCODE_MENU_STRING (item_name);
+             AREF (menu_items, i + MENU_ITEMS_ITEM_NAME) = item_name;
+           }
+           if (STRINGP (descrip) && STRING_MULTIBYTE (descrip))
+             {
+             descrip = ENCODE_MENU_STRING (descrip);
+             AREF (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY) = descrip;
+           }
+ #endif /* not HAVE_MULTILINGUAL_MENU */
+ 
+         wv = xmalloc_widget_value ();
+         if (prev_wv)
+           prev_wv->next = wv;
+         else
+           save_wv->contents = wv;
+         wv->name = (char *) SDATA (item_name);
+         if (!NILP (descrip))
+           wv->key = (char *) SDATA (descrip);
+         wv->value = 0;
+         /* Use the contents index as call_data, since we are
+              restricted to 16-bits.  */
+         wv->call_data = !NILP (def) ? (void *) (EMACS_INT) i : 0;
+         wv->enabled = !NILP (enable);
+ 
+         if (NILP (type))
+           wv->button_type = BUTTON_TYPE_NONE;
+         else if (EQ (type, QCtoggle))
+           wv->button_type = BUTTON_TYPE_TOGGLE;
+         else if (EQ (type, QCradio))
+           wv->button_type = BUTTON_TYPE_RADIO;
+         else
+           abort ();
+ 
+         wv->selected = !NILP (selected);
+           if (!STRINGP (help))
+           help = Qnil;
+ 
+         wv->help = help;
+ 
+         prev_wv = wv;
+ 
+         i += MENU_ITEMS_ITEM_LENGTH;
+       }
+     }
+ 
+   /* Deal with the title, if it is non-nil.  */
+   if (!NILP (title))
+     {
+       widget_value *wv_title = xmalloc_widget_value ();
+       widget_value *wv_sep = xmalloc_widget_value ();
+ 
+       /* Maybe replace this separator with a bitmap or owner-draw item
+        so that it looks better.  Having two separators looks odd.  */
+       wv_sep->name = "--";
+       wv_sep->next = first_wv->contents;
+       wv_sep->help = Qnil;
+ 
+ #ifndef HAVE_MULTILINGUAL_MENU
+       if (STRING_MULTIBYTE (title))
+       title = ENCODE_MENU_STRING (title);
+ #endif
+       wv_title->name = (char *) SDATA (title);
+       wv_title->enabled = TRUE;
+       wv_title->title = TRUE;
+       wv_title->button_type = BUTTON_TYPE_NONE;
+       wv_title->help = Qnil;
+       wv_title->next = wv_sep;
+       first_wv->contents = wv_title;
+     }
+ 
+   /* Actually create the menu.  */
+   menu = NewMenu (POPUP_SUBMENU_ID, "\p");
+   submenu_id = MIN_POPUP_SUBMENU_ID;
+   fill_submenu (menu, first_wv->contents);
+ 
+   /* Adjust coordinates to be root-window-relative.  */
+   pos.h = x;
+   pos.v = y;
+ 
+   SetPortWindowPort (FRAME_MAC_WINDOW (f));
+ 
+   LocalToGlobal (&pos);
+ 
+   /* No selection has been chosen yet.  */
+   menu_item_choice = 0;
+   menu_item_selection = 0;
+ 
+   InsertMenu (menu, -1);
+ 
+   /* Display the menu.  */
+   menu_item_choice = PopUpMenuSelect (menu, pos.v, pos.h, 0);
+   menu_item_selection = LoWord (menu_item_choice);
+ 
+   /* Get the refcon to find the correct item*/
+   if (menu_item_selection)
+     {
+       MenuHandle sel_menu = GetMenuHandle (HiWord (menu_item_choice));
+       if (sel_menu) {
+       GetMenuItemRefCon (sel_menu, menu_item_selection, &refcon);
+       }
+     }
+ 
+ #if 0
+   /* Clean up extraneous mouse events which might have been generated
+      during the call.  */
+   discard_mouse_events ();
+ #endif
+ 
+   /* Must reset this manually because the button release event is not
+      passed to Emacs event loop. */
+   FRAME_MAC_DISPLAY_INFO (f)->grabbed = 0;
+ 
+   /* Free the widget_value objects we used to specify the
+      contents.  */
+   free_menubar_widget_value_tree (first_wv);
+ 
+   /* delete all menus */
+   {
+     int i = MIN_POPUP_SUBMENU_ID;
+     MenuHandle submenu = GetMenuHandle (i);
+     while (submenu != NULL)
+       {
+       DeleteMenu (i);
+       DisposeMenu (submenu);
+       submenu = GetMenuHandle (++i);
+       }
+   }
+ 
+   DeleteMenu (POPUP_SUBMENU_ID);
+   DisposeMenu (menu);
+ 
+   /* Find the selected item, and its pane, to return
+      the proper value.  */
+   if (menu_item_selection != 0)
+     {
+       Lisp_Object prefix, entry;
+ 
+       prefix = entry = Qnil;
+       i = 0;
+       while (i < menu_items_used)
+       {
+         if (EQ (XVECTOR (menu_items)->contents[i], Qnil))
+           {
+             subprefix_stack[submenu_depth++] = prefix;
+             prefix = entry;
+             i++;
+           }
+         else if (EQ (XVECTOR (menu_items)->contents[i], Qlambda))
+           {
+             prefix = subprefix_stack[--submenu_depth];
+             i++;
+           }
+         else if (EQ (XVECTOR (menu_items)->contents[i], Qt))
+           {
+             prefix
+               = XVECTOR (menu_items)->contents[i + MENU_ITEMS_PANE_PREFIX];
+             i += MENU_ITEMS_PANE_LENGTH;
+           }
+         /* Ignore a nil in the item list.
+            It's meaningful only for dialog boxes.  */
+         else if (EQ (XVECTOR (menu_items)->contents[i], Qquote))
+           i += 1;
+         else
+           {
+             entry
+               = XVECTOR (menu_items)->contents[i + MENU_ITEMS_ITEM_VALUE];
+             if ((int) (EMACS_INT) refcon == i)
+               {
+                 if (keymaps != 0)
+                   {
+                     int j;
+ 
+                     entry = Fcons (entry, Qnil);
+                     if (!NILP (prefix))
+                       entry = Fcons (prefix, entry);
+                     for (j = submenu_depth - 1; j >= 0; j--)
+                       if (!NILP (subprefix_stack[j]))
+                         entry = Fcons (subprefix_stack[j], entry);
+                   }
+                 return entry;
+               }
+             i += MENU_ITEMS_ITEM_LENGTH;
+           }
+       }
+     }
+ 
+   return Qnil;
+ }
+ 
+ 
+ #ifdef HAVE_DIALOGS
+ /* Construct native Mac OS menubar based on widget_value tree.  */
+ 
+ static int
+ mac_dialog (widget_value *wv)
+ {
+   char *dialog_name;
+   char *prompt;
+   char **button_labels;
+   UInt32 *ref_cons;
+   int nb_buttons;
+   int left_count;
+   int i;
+   int dialog_width;
+   Rect rect;
+   WindowPtr window_ptr;
+   ControlHandle ch;
+   int left;
+   EventRecord event_record;
+   SInt16 part_code;
+   int control_part_code;
+   Point mouse;
+ 
+   dialog_name = wv->name;
+   nb_buttons = dialog_name[1] - '0';
+   left_count = nb_buttons - (dialog_name[4] - '0');
+   button_labels = (char **) alloca (sizeof (char *) * nb_buttons);
+   ref_cons = (UInt32 *) alloca (sizeof (UInt32) * nb_buttons);
+ 
+   wv = wv->contents;
+   prompt = (char *) alloca (strlen (wv->value) + 1);
+   strcpy (prompt, wv->value);
+   c2pstr (prompt);
+ 
+   wv = wv->next;
+   for (i = 0; i < nb_buttons; i++)
+     {
+       button_labels[i] = wv->value;
+       button_labels[i] = (char *) alloca (strlen (wv->value) + 1);
+       strcpy (button_labels[i], wv->value);
+       c2pstr (button_labels[i]);
+       ref_cons[i] = (UInt32) wv->call_data;
+       wv = wv->next;
+     }
+ 
+   window_ptr = GetNewCWindow (DIALOG_WINDOW_RESOURCE, NULL, (WindowPtr) -1);
+ 
+   SetPortWindowPort (window_ptr);
+ 
+   TextFont (0);
+   /* Left and right margins in the dialog are 13 pixels each.*/
+   dialog_width = 14;
+   /* Calculate width of dialog box: 8 pixels on each side of the text
+      label in each button, 12 pixels between buttons.  */
+   for (i = 0; i < nb_buttons; i++)
+     dialog_width +=  StringWidth (button_labels[i]) + 16 + 12;
+ 
+   if (left_count != 0 && nb_buttons - left_count != 0)
+     dialog_width += 12;
+ 
+   dialog_width = max (dialog_width, StringWidth (prompt) + 26);
+ 
+   SizeWindow (window_ptr, dialog_width, 78, 0);
+   ShowWindow (window_ptr);
+ 
+   SetPortWindowPort (window_ptr);
+ 
+   TextFont (0);
+ 
+   MoveTo (13, 29);
+   DrawString (prompt);
+ 
+   left = 13;
+   for (i = 0; i < nb_buttons; i++)
+     {
+       int button_width = StringWidth (button_labels[i]) + 16;
+       SetRect (&rect, left, 45, left + button_width, 65);
+       ch = NewControl (window_ptr, &rect, button_labels[i], 1, 0, 0, 0,
+                        kControlPushButtonProc, ref_cons[i]);
+       left += button_width + 12;
+       if (i == left_count - 1)
+         left += 12;
+     }
+ 
+   i = 0;
+   while (!i)
+     {
+       if (WaitNextEvent (mDownMask, &event_record, 10, NULL))
+         if (event_record.what == mouseDown)
+           {
+             part_code = FindWindow (event_record.where, &window_ptr);
+             if (part_code == inContent)
+               {
+                 mouse = event_record.where;
+                 GlobalToLocal (&mouse);
+                 control_part_code = FindControl (mouse, window_ptr, &ch);
+                 if (control_part_code == kControlButtonPart)
+                   if (TrackControl (ch, mouse, NULL))
+                     i = GetControlReference (ch);
+               }
+           }
+     }
+ 
+   DisposeWindow (window_ptr);
+ 
+   return i;
+ }
+ 
+ static char * button_names [] = {
+   "button1", "button2", "button3", "button4", "button5",
+   "button6", "button7", "button8", "button9", "button10" };
+ 
+ static Lisp_Object
+ mac_dialog_show (f, keymaps, title, error)
+      FRAME_PTR f;
+      int keymaps;
+      Lisp_Object title;
+      char **error;
+ {
+   int i, nb_buttons=0;
+   char dialog_name[6];
+   int menu_item_selection;
+ 
+   widget_value *wv, *first_wv = 0, *prev_wv = 0;
+ 
+   /* Number of elements seen so far, before boundary.  */
+   int left_count = 0;
+   /* 1 means we've seen the boundary between left-hand elts and right-hand.  
*/
+   int boundary_seen = 0;
+ 
+   *error = NULL;
+ 
+   if (menu_items_n_panes > 1)
+     {
+       *error = "Multiple panes in dialog box";
+       return Qnil;
+     }
+ 
+   /* Create a tree of widget_value objects
+      representing the text label and buttons.  */
+   {
+     Lisp_Object pane_name, prefix;
+     char *pane_string;
+     pane_name = XVECTOR (menu_items)->contents[MENU_ITEMS_PANE_NAME];
+     prefix = XVECTOR (menu_items)->contents[MENU_ITEMS_PANE_PREFIX];
+     pane_string = (NILP (pane_name)
+                  ? "" : (char *) SDATA (pane_name));
+     prev_wv = xmalloc_widget_value ();
+     prev_wv->value = pane_string;
+     if (keymaps && !NILP (prefix))
+       prev_wv->name++;
+     prev_wv->enabled = 1;
+     prev_wv->name = "message";
+     prev_wv->help = Qnil;
+     first_wv = prev_wv;
+ 
+     /* Loop over all panes and items, filling in the tree.  */
+     i = MENU_ITEMS_PANE_LENGTH;
+     while (i < menu_items_used)
+       {
+ 
+       /* Create a new item within current pane.  */
+       Lisp_Object item_name, enable, descrip, help;
+ 
+       item_name = XVECTOR (menu_items)->contents[i + MENU_ITEMS_ITEM_NAME];
+       enable = XVECTOR (menu_items)->contents[i + MENU_ITEMS_ITEM_ENABLE];
+       descrip
+         = XVECTOR (menu_items)->contents[i + MENU_ITEMS_ITEM_EQUIV_KEY];
+         help = XVECTOR (menu_items)->contents[i + MENU_ITEMS_ITEM_HELP];
+ 
+       if (NILP (item_name))
+         {
+           free_menubar_widget_value_tree (first_wv);
+           *error = "Submenu in dialog items";
+           return Qnil;
+         }
+       if (EQ (item_name, Qquote))
+         {
+           /* This is the boundary between left-side elts
+              and right-side elts.  Stop incrementing right_count.  */
+           boundary_seen = 1;
+           i++;
+           continue;
+         }
+       if (nb_buttons >= 9)
+         {
+           free_menubar_widget_value_tree (first_wv);
+           *error = "Too many dialog items";
+           return Qnil;
+         }
+ 
+       wv = xmalloc_widget_value ();
+       prev_wv->next = wv;
+       wv->name = (char *) button_names[nb_buttons];
+       if (!NILP (descrip))
+         wv->key = (char *) SDATA (descrip);
+       wv->value = (char *) SDATA (item_name);
+       wv->call_data = (void *) i;
+         /* menu item is identified by its index in menu_items table */
+       wv->enabled = !NILP (enable);
+       wv->help = Qnil;
+       prev_wv = wv;
+ 
+       if (! boundary_seen)
+         left_count++;
+ 
+       nb_buttons++;
+       i += MENU_ITEMS_ITEM_LENGTH;
+       }
+ 
+     /* If the boundary was not specified,
+        by default put half on the left and half on the right.  */
+     if (! boundary_seen)
+       left_count = nb_buttons - nb_buttons / 2;
+ 
+     wv = xmalloc_widget_value ();
+     wv->name = dialog_name;
+     wv->help = Qnil;
+ 
+     /* Dialog boxes use a really stupid name encoding
+        which specifies how many buttons to use
+        and how many buttons are on the right.
+        The Q means something also.  */
+     dialog_name[0] = 'Q';
+     dialog_name[1] = '0' + nb_buttons;
+     dialog_name[2] = 'B';
+     dialog_name[3] = 'R';
+     /* Number of buttons to put on the right.  */
+     dialog_name[4] = '0' + nb_buttons - left_count;
+     dialog_name[5] = 0;
+     wv->contents = first_wv;
+     first_wv = wv;
+   }
+ 
+   /* Actually create the dialog.  */
+ #ifdef HAVE_DIALOGS
+   menu_item_selection = mac_dialog (first_wv);
+ #else
+   menu_item_selection = 0;
+ #endif
+ 
+   /* Free the widget_value objects we used to specify the contents.  */
+   free_menubar_widget_value_tree (first_wv);
+ 
+   /* Find the selected item, and its pane, to return the proper
+      value.  */
+   if (menu_item_selection != 0)
+     {
+       Lisp_Object prefix;
+ 
+       prefix = Qnil;
+       i = 0;
+       while (i < menu_items_used)
+       {
+         Lisp_Object entry;
+ 
+         if (EQ (XVECTOR (menu_items)->contents[i], Qt))
+           {
+             prefix
+               = XVECTOR (menu_items)->contents[i + MENU_ITEMS_PANE_PREFIX];
+             i += MENU_ITEMS_PANE_LENGTH;
+           }
+         else
+           {
+             entry
+               = XVECTOR (menu_items)->contents[i + MENU_ITEMS_ITEM_VALUE];
+             if (menu_item_selection == i)
+               {
+                 if (keymaps != 0)
+                   {
+                     entry = Fcons (entry, Qnil);
+                     if (!NILP (prefix))
+                       entry = Fcons (prefix, entry);
+                   }
+                 return entry;
+               }
+             i += MENU_ITEMS_ITEM_LENGTH;
+           }
+       }
+     }
+ 
+   return Qnil;
+ }
+ #endif  /* HAVE_DIALOGS  */
+ 
+ 
+ /* Is this item a separator? */
+ static int
+ name_is_separator (name)
+      char *name;
+ {
+   char *start = name;
+ 
+   /* Check if name string consists of only dashes ('-').  */
+   while (*name == '-') name++;
+   /* Separators can also be of the form "--:TripleSuperMegaEtched"
+      or "--deep-shadow".  We don't implement them yet, se we just treat
+      them like normal separators.  */
+   return (*name == '\0' || start + 2 == name);
+ }
+ 
+ static void
+ add_menu_item (MenuHandle menu, widget_value *wv, int submenu,
+              int force_disable)
+ {
+   Str255 item_name;
+   int pos;
+ 
+   if (name_is_separator (wv->name))
+     AppendMenu (menu, "\p-");
+   else
+     {
+       AppendMenu (menu, "\pX");
+ 
+ #if TARGET_API_MAC_CARBON
+       pos = CountMenuItems (menu);
+ #else
+       pos = CountMItems (menu);
+ #endif
+ 
+       strcpy (item_name, "");
+       strncat (item_name, wv->name, 255);
+       if (wv->key != NULL)
+       {
+         strncat (item_name, " ", 255);
+         strncat (item_name, wv->key, 255);
+       }
+       item_name[255] = 0;
+ #if TARGET_API_MAC_CARBON
+       {
+       CFStringRef string =
+         CFStringCreateWithCString (NULL, item_name, kCFStringEncodingUTF8);
+ 
+       SetMenuItemTextWithCFString (menu, pos, string);
+       CFRelease (string);
+       }
+ #else
+       c2pstr (item_name);
+       SetMenuItemText (menu, pos, item_name);
+ #endif
+ 
+       if (wv->enabled && !force_disable)
+ #if TARGET_API_MAC_CARBON
+         EnableMenuItem (menu, pos);
+ #else
+         EnableItem (menu, pos);
+ #endif
+       else
+ #if TARGET_API_MAC_CARBON
+         DisableMenuItem (menu, pos);
+ #else
+         DisableItem (menu, pos);
+ #endif
+ 
+       /* Draw radio buttons and tickboxes. */
+       {
+       if (wv->selected && (wv->button_type == BUTTON_TYPE_TOGGLE ||
+                            wv->button_type == BUTTON_TYPE_RADIO))
+       SetItemMark (menu, pos, checkMark);
+       else
+       SetItemMark (menu, pos, noMark);
+       }
+ 
+       SetMenuItemRefCon (menu, pos, (UInt32) wv->call_data);
+     }
+ 
+   if (submenu != NULL)
+     SetMenuItemHierarchicalID (menu, pos, submenu);
+ }
+ 
+ /* Construct native Mac OS menubar based on widget_value tree.  */
+ 
+ static void
+ fill_submenu (MenuHandle menu, widget_value *wv)
+ {
+   for ( ; wv != NULL; wv = wv->next)
+     if (wv->contents)
+       {
+       int cur_submenu = submenu_id++;
+         MenuHandle submenu = NewMenu (cur_submenu, "\pX");
+         fill_submenu (submenu, wv->contents);
+         InsertMenu (submenu, -1);
+         add_menu_item (menu, wv, cur_submenu, 0);
+       }
+     else
+       add_menu_item (menu, wv, NULL, 0);
+ }
+ 
+ 
+ /* Construct native Mac OS menu based on widget_value tree.  */
+ 
+ static void
+ fill_menu (MenuHandle menu, widget_value *wv)
+ {
+   for ( ; wv != NULL; wv = wv->next)
+     if (wv->contents)
+       {
+       int cur_submenu = submenu_id++;
+         MenuHandle submenu = NewMenu (cur_submenu, "\pX");
+         fill_submenu (submenu, wv->contents);
+         InsertMenu (submenu, -1);
+         add_menu_item (menu, wv, cur_submenu, 0);
+       }
+     else
+       add_menu_item (menu, wv, NULL, 0);
+ }
+ 
+ /* Construct native Mac OS menubar based on widget_value tree.  */
+ 
+ static void
+ fill_menubar (widget_value *wv)
+ {
+   int id;
+ 
+   submenu_id  = MIN_SUBMENU_ID;
+ 
+   for (id = MIN_MENU_ID; wv != NULL; wv = wv->next, id++)
+     {
+       MenuHandle menu;
+       Str255 title;
+ 
+       strncpy (title, wv->name, 255);
+       title[255] = 0;
+       c2pstr (title);
+       menu = NewMenu (id, title);
+ 
+       if (wv->contents)
+         fill_menu (menu, wv->contents);
+ 
+       InsertMenu (menu, 0);
+     }
+ }
+ 
+ #endif /* HAVE_MENUS */
+ 
+ 
+ void
+ syms_of_macmenu ()
+ {
+   staticpro (&menu_items);
+   menu_items = Qnil;
+ 
+   Qdebug_on_next_call = intern ("debug-on-next-call");
+   staticpro (&Qdebug_on_next_call);
+ 
+   DEFVAR_LISP ("menu-updating-frame", &Vmenu_updating_frame,
+              doc: /* Frame for which we are updating a menu.
+ The enable predicate for a menu command should check this variable.  */);
+   Vmenu_updating_frame = Qnil;
+ 
+   defsubr (&Sx_popup_menu);
+ #ifdef HAVE_MENUS
+   defsubr (&Sx_popup_dialog);
+ #endif
+ }
+ 
+ /* arch-tag: 40b2c6c7-b8a9-4a49-b930-1b2707184cce
+    (do not change this comment) */




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