macmenu.c 63 KB
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/* Menu support for GNU Emacs on the for Mac OS.
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   Copyright (C) 2000, 2001, 2002, 2003  Free Software Foundation, Inc.
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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.  */

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/* Contributed by Andrew Choi (akochoi@mac.com).  */
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#include <config.h>
#include <signal.h>

#include <stdio.h>
#include "lisp.h"
#include "termhooks.h"
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#include "keyboard.h"
#include "keymap.h"
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#include "frame.h"
#include "window.h"
#include "blockinput.h"
#include "buffer.h"
#include "charset.h"
#include "coding.h"

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#ifndef MAC_OSX
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#include <MacTypes.h>
#include <Menus.h>
#include <QuickDraw.h>
#include <ToolUtils.h>
#include <Fonts.h>
#include <Controls.h>
#include <Windows.h>
#include <Events.h>
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#if defined (__MRC__) || (__MSL__ >= 0x6000)
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#include <ControlDefinitions.h>
#endif
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#endif /* not MAC_OSX */
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/* 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
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#define MIN_POPUP_SUBMENU_ID 512
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#define MIN_MENU_ID 256
#define MIN_SUBMENU_ID 1

#define DIALOG_WINDOW_RESOURCE 130

#define HAVE_DIALOGS 1

#undef HAVE_MULTILINGUAL_MENU
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#undef HAVE_DIALOGS /* TODO: Implement native dialogs.  */
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/******************************************************************/
/* Definitions copied from lwlib.h */

typedef void * XtPointer;

enum button_type
{
  BUTTON_TYPE_NONE,
  BUTTON_TYPE_TOGGLE,
  BUTTON_TYPE_RADIO
};

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/* This structure is based on the one in ../lwlib/lwlib.h, modified
   for Mac OS.  */
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typedef struct _widget_value
{
  /* name of widget */
  char*		name;
  /* value (meaning depend on widget type) */
  char*		value;
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  /* keyboard equivalent. no implications for XtTranslations */
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  char*		key;
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  /* Help string or nil if none.
     GC finds this string through the frame's menu_bar_vector
     or through menu_items.  */
  Lisp_Object	help;
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  /* 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 */
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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;

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));
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#ifdef HAVE_DIALOGS
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static Lisp_Object mac_dialog_show ();
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#endif
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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 ();

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static void fill_submenu (MenuHandle, widget_value *);
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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;

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/* Index of the next submenu */
static int submenu_id;

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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 <marcus@sysc.pdx.edu>.  */

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;
}

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/* Start a new menu pane in menu_items.
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   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++)
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    single_keymap_panes (keymaps[mapno],
                         Fkeymap_prompt (keymaps[mapno]), Qnil, notreal, 10);
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  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.
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   KEY is a key in a keymap and ITEM is its binding.
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   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;
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  /* 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];
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  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];
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  item_string = XVECTOR (item_properties)->contents[ITEM_PROPERTY_NAME];
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  if (!NILP (map) && SREF (item_string, 0) == '@')
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    {
      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);
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      CHECK_STRING (pane_name);
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      push_menu_pane (pane_name, Qnil);
      pane_data = Fcdr (elt);
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      CHECK_CONS (pane_data);
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      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
	{
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	  CHECK_CONS (item);
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	  item1 = Fcar (item);
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	  CHECK_STRING (item1);
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	  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,
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       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.  */)
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  (position, menu)
     Lisp_Object position, menu;
{
  Lisp_Object keymap, tem;
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  int xpos = 0, ypos = 0;
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  Lisp_Object title;
  char *error_name;
  Lisp_Object selection;
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  FRAME_PTR f = NULL;
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  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)
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	  || (CONSP (position) && (EQ (XCAR (position), Qmenu_bar)
                                   || EQ (XCAR (position), Qtool_bar))))
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	{
	  /* 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);
	    }
	}

692 693
      CHECK_NUMBER (x);
      CHECK_NUMBER (y);
694 695 696 697 698 699 700 701 702 703 704

      /* Decode where to put the menu.  */

      if (FRAMEP (window))
	{
	  f = XFRAME (window);
	  xpos = 0;
	  ypos = 0;
	}
      else if (WINDOWP (window))
	{
705
	  CHECK_LIVE_WINDOW (window);
706 707
	  f = XFRAME (WINDOW_FRAME (XWINDOW (window)));

708 709
	  xpos = WINDOW_LEFT_EDGE_X (XWINDOW (window));
	  ypos = WINDOW_TOP_EDGE_Y (XWINDOW (window));
710 711 712 713
	}
      else
	/* ??? Not really clean; should be CHECK_WINDOW_OR_FRAME,
	   but I don't want to make one now.  */
714
	CHECK_WINDOW (window);
715 716 717 718 719 720 721 722 723 724 725 726 727 728

      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.  */

729 730
  keymap = get_keymap (menu, 0, 0);
  if (CONSP (keymap))
731 732 733 734 735 736 737 738 739
    {
      /* 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.  */
740
      prompt = Fkeymap_prompt (keymap);
741 742 743 744 745 746 747 748 749
      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;
    }
750
  else if (CONSP (menu) && KEYMAPP (XCAR (menu)))
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765
    {
      /* 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;

766
	  maps[i++] = keymap = get_keymap (Fcar (tem), 1, 0);
767

768
	  prompt = Fkeymap_prompt (keymap);
769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785
	  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);
786
      CHECK_STRING (title);
787 788 789 790 791

      list_of_panes (Fcdr (menu));

      keymaps = 0;
    }
792

793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
  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,
820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
       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.)  */)
835 836 837
  (position, contents)
     Lisp_Object position, contents;
{
838
  FRAME_PTR f = NULL;
839 840 841 842 843 844
  Lisp_Object window;

  check_mac ();

  /* Decode the first argument: find the window or frame to use.  */
  if (EQ (position, Qt)
845 846
      || (CONSP (position) && (EQ (XCAR (position), Qmenu_bar)
                               || EQ (XCAR (position), Qtool_bar))))
847 848 849 850 851
    {
#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;
852
      enum scroll_bar_part part;
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887
      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))
    {
888
      CHECK_LIVE_WINDOW (window);
889 890 891 892 893
      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.  */
894
    CHECK_WINDOW (window);
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916

#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);
917
    CHECK_STRING (title);
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935

    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
936
   MENU_BAR_ACTIVATE_EVENT out of the Emacs event queue.
937 938 939 940 941 942 943 944

   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.  */
945

946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977
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;
978
  entry = Qnil;
979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003
  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];
1004 1005 1006
	  /* 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)
1007 1008 1009 1010
	    {
	      int j;
	      struct input_event buf;
	      Lisp_Object frame;
1011
	      EVENT_INIT (buf);
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040

	      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);

1041 1042
	      f->output_data.mac->menu_command_in_progress = 0;
	      f->output_data.mac->menubar_active = 0;
1043 1044 1045 1046 1047
	      return;
	    }
	  i += MENU_ITEMS_ITEM_LENGTH;
	}
    }
1048 1049
  f->output_data.mac->menu_command_in_progress = 0;
  f->output_data.mac->menubar_active = 0;
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
}

/* 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])
1130
	  || (CONSP (mapvec[i]) && !KEYMAPP (mapvec[i])))
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
	{
	  /* 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;
1153
  wv->help = Qnil;
1154 1155 1156
  first_wv = wv;
  save_wv = 0;
  prev_wv = 0;
1157

1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189
  /* 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;
1190

1191 1192
	  pane_name = XVECTOR (menu_items)->contents[i + MENU_ITEMS_PANE_NAME];
	  prefix = XVECTOR (menu_items)->contents[i + MENU_ITEMS_PANE_PREFIX];
1193

1194 1195
#ifndef HAVE_MULTILINGUAL_MENU
	  if (STRINGP (pane_name) && STRING_MULTIBYTE (pane_name))
1196 1197 1198 1199
	    {
	      pane_name = ENCODE_SYSTEM (pane_name);
	      AREF (menu_items, i + MENU_ITEMS_PANE_NAME) = pane_name;
	    }
1200 1201
#endif
	  pane_string = (NILP (pane_name)
1202
			 ? "" : (char *) SDATA (pane_name));
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
	  /* 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->name = pane_string;
	      /* Ignore the @ that means "separate pane".
		 This is a kludge, but this isn't worth more time.  */
	      if (!NILP (prefix) && wv->name[0] == '@')
		wv->name++;
	      wv->value = 0;
	      wv->enabled = 1;
	      wv->button_type = BUTTON_TYPE_NONE;
1226
	      wv->help = Qnil;
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
	    }
	  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;

1238 1239 1240 1241 1242 1243 1244
	  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);
1245 1246

#ifndef HAVE_MULTILINGUAL_MENU
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
	  if (STRING_MULTIBYTE (item_name))
	    {
	      item_name = ENCODE_SYSTEM (item_name);
	      AREF (menu_items, i + MENU_ITEMS_ITEM_NAME) = item_name;
	    }

	  if (STRINGP (descrip) && STRING_MULTIBYTE (descrip))
	    {
	      descrip = ENCODE_SYSTEM (descrip);
	      AREF (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY) = descrip;
	    }
#endif /* not HAVE_MULTILINGUAL_MENU */
1259 1260

	  wv = xmalloc_widget_value ();
1261
	  if (prev_wv)
1262 1263 1264 1265
	    prev_wv->next = wv;
	  else
	    save_wv->contents = wv;

1266
	  wv->name = (char *) SDATA (item_name);
1267
	  if (!NILP (descrip))
1268
	    wv->key = (char *) SDATA (descrip);
1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284
	  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);
1285 1286 1287 1288
	  if (!STRINGP (help))
	    help = Qnil;

	  wv->help = help;
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322

	  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;
}

/* 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;

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  /* We must not change the menubar when actually in use.  */
  if (f->output_data.mac->menubar_active)
    return;

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  XSETFRAME (Vmenu_updating_frame, f);

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  if (! menubar_widget)
    deep_p = 1;
  else if (pending_menu_activation && !deep_p)
    deep_p = 1;

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  wv = xmalloc_widget_value ();
  wv->name = "menubar";
  wv->value = 0;
  wv->enabled = 1;
  wv->button_type = BUTTON_TYPE_NONE;
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  wv->help = Qnil;
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  first_wv = wv;

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  if (deep_p)
    {
      /* Make a widget-value tree representing the entire menu trees.  */

      struct buffer *prev = current_buffer;
      Lisp_Object buffer;
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Juanma Barranquero committed
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      int specpdl_count = SPECPDL_INDEX ();
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      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);
	}
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      set_buffer_internal_1 (XBUFFER (buffer));
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      /* 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));
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      items = FRAME_MENU_BAR_ITEMS (f);
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      inhibit_garbage_collection ();
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      /* 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));
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      /* 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);
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	  if (prev_wv)
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	    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 ();
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      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
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	    || (NILP (Fequal (previous_items[i],
			      XVECTOR (menu_items)->contents[i]))))
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	  break;
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      if (i == menu_items_used && i == previous_menu_items_used && i != 0)
	{
	  free_menubar_widget_value_tree (first_wv);
	  menu_items = Qnil;
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	  return;
	}
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      /* 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;
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	  wv->name = (char *) SDATA (string);
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	  wv = wv->next;
	}
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      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.  */
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      items = FRAME_MENU_BAR_ITEMS (f);
      for (i = 0; i < XVECTOR (items)->size; i += 4)
	{
	  Lisp_Object string;
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	  string = XVECTOR (items)->contents[i + 1];
	  if (NILP (string))
	    break;
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	  wv = xmalloc_widget_value ();
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	  wv->name = (char *) SDATA (string);
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	  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);
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	  if (prev_wv)
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	    prev_wv->next = wv;
	  else
	    first_wv->contents = wv;
	  prev_wv = wv;
	}
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      /* 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;
    }
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  /* Create or update the menu bar widget.  */

  BLOCK_INPUT;

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  /* Non-null value to indicate menubar has already been "created".  */
  f->output_data.mac->menubar_widget = 1;
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  {
    int i = MIN_MENU_ID;
    MenuHandle menu = GetMenuHandle (i);
    while (menu != NULL)
      {
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	DeleteMenu (i);
	DisposeMenu (menu);
	menu = GetMenuHandle (++i);
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      }
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    i = MIN_SUBMENU_ID;
    menu = GetMenuHandle (i);
    while (menu != NULL)
      {
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	DeleteMenu (i);
	DisposeMenu (menu);
	menu = GetMenuHandle (++i);
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      }
  }

  fill_menubar (first_wv->contents);
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  DrawMenuBar ();
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  free_menubar_widget_value_tree (first_wv);

  UNBLOCK_INPUT;
}

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/* 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.  */
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