/* X Communication module for terminals which understand the X protocol.
   Copyright (C) 1986, 1988, 1993, 1994 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.  */

/* Written by Kevin Gallo.  */

#include <signal.h>
#include <config.h>

#include <stdio.h>
#include "lisp.h"
#include "termhooks.h"
#include "frame.h"
#include "window.h"
#include "keyboard.h"
#include "blockinput.h"

/* This may include sys/types.h, and that somehow loses
   if this is not done before the other system files.  */
#include "w32term.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 min(x, y) (((x) < (y)) ? (x) : (y))
#define max(x, y) (((x) > (y)) ? (x) : (y))

typedef struct menu_map 
{
  Lisp_Object menu_items;
  int menu_items_allocated;
  int menu_items_used;
} menu_map;

extern Lisp_Object Qmenu_enable;
extern Lisp_Object Qmenu_bar;

static Lisp_Object win32_dialog_show ();
static Lisp_Object win32menu_show ();

static HMENU keymap_panes ();
static HMENU single_keymap_panes ();
static HMENU list_of_panes ();
static HMENU list_of_items ();

static HMENU create_menu_items ();

/* Initialize the menu_items structure if we haven't already done so.
   Also mark it as currently empty.  */

static void 
init_menu_items (lpmm)
     menu_map * lpmm;
{
  if (NILP (lpmm->menu_items))
    {
      lpmm->menu_items_allocated = 60;
      lpmm->menu_items = Fmake_vector (make_number (lpmm->menu_items_allocated),
				       Qnil);
    }
  
  lpmm->menu_items_used = 0;
}

/* Call when finished using the data for the current menu
   in menu_items.  */

static void 
discard_menu_items (lpmm)
     menu_map * lpmm;
{
  lpmm->menu_items = Qnil;
  lpmm->menu_items_allocated = lpmm->menu_items_used = 0;
}

/* Make the menu_items vector twice as large.  */

static void 
grow_menu_items (lpmm)
     menu_map * lpmm;
{
  Lisp_Object new;
  int old_size = lpmm->menu_items_allocated;
  
  lpmm->menu_items_allocated *= 2;
  new = Fmake_vector (make_number (lpmm->menu_items_allocated), Qnil);
  bcopy (XVECTOR (lpmm->menu_items)->contents, XVECTOR (new)->contents,
	 old_size * sizeof (Lisp_Object));
  
  lpmm->menu_items = new;
}

/* Indicate boundary between left and right.  */

static void 
add_left_right_boundary (hmenu)
     HMENU hmenu;
{
  AppendMenu (hmenu, MF_MENUBARBREAK, 0, NULL);
}

/* 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.  EQUIV is the textual description
   of the keyboard equivalent for this item (or nil if none).  */

static void 
add_menu_item (lpmm, hmenu, name, enable, key)
     menu_map * lpmm;
     HMENU hmenu;
     Lisp_Object name;
     UINT enable;
     Lisp_Object key;
{
  UINT fuFlags;
  
  if (NILP (name) 
      || ((char *) XSTRING (name)->data)[0] == 0
      || strcmp ((char *) XSTRING (name)->data, "--") == 0)
    fuFlags = MF_SEPARATOR;
  else if (enable)
    fuFlags = MF_STRING;
  else
    fuFlags = MF_STRING | MF_GRAYED;
  
  AppendMenu (hmenu,
	      fuFlags,
	      lpmm->menu_items_used + 1,
	      (fuFlags == MF_SEPARATOR)?NULL: (char *) XSTRING (name)->data);
  
  lpmm->menu_items_used++;
#if 0
  if (lpmm->menu_items_used >= lpmm->menu_items_allocated)
    grow_menu_items (lpmm);
  
  XSET (XVECTOR (lpmm->menu_items)->contents[lpmm->menu_items_used++],
	Lisp_Cons,
	key);
#endif
}

/* Figure out the current keyboard equivalent of a menu item ITEM1.
   The item string for menu display should be ITEM_STRING.
   Store the equivalent keyboard key sequence's
   textual description into *DESCRIP_PTR.
   Also cache them in the item itself.
   Return the real definition to execute.  */

static Lisp_Object 
menu_item_equiv_key (item_string, item1, descrip_ptr)
     Lisp_Object item_string;
     Lisp_Object item1;
     Lisp_Object *descrip_ptr;
{
  /* This is the real definition--the function to run.  */
  Lisp_Object def;
  /* This is the sublist that records cached equiv key data
     so we can save time.  */
  Lisp_Object cachelist;
  /* These are the saved equivalent keyboard key sequence
     and its key-description.  */
  Lisp_Object savedkey, descrip;
  Lisp_Object def1;
  int changed = 0;
  struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
  
  /* If a help string follows the item string, skip it.  */
  if (CONSP (XCONS (item1)->cdr)
      && STRINGP (XCONS (XCONS (item1)->cdr)->car))
    item1 = XCONS (item1)->cdr;
  
  def = Fcdr (item1);
  
  /* Get out the saved equivalent-keyboard-key info.  */
  cachelist = savedkey = descrip = Qnil;
  if (CONSP (def) && CONSP (XCONS (def)->car)
      && (NILP (XCONS (XCONS (def)->car)->car)
	  || VECTORP (XCONS (XCONS (def)->car)->car)))
    {
      cachelist = XCONS (def)->car;
      def = XCONS (def)->cdr;
      savedkey = XCONS (cachelist)->car;
      descrip = XCONS (cachelist)->cdr;
    }
  
  GCPRO4 (def, def1, savedkey, descrip);
  
  /* Is it still valid?  */
  def1 = Qnil;
  if (!NILP (savedkey))
    def1 = Fkey_binding (savedkey, Qnil);
  /* If not, update it.  */
  if (! EQ (def1, def)
      /* If the command is an alias for another
	 (such as easymenu.el and lmenu.el set it up),
	 check if the original command matches the cached command. */
      && !(SYMBOLP (def) && SYMBOLP (XSYMBOL (def)->function)
	   && EQ (def1, XSYMBOL (def)->function))
      /* If something had no key binding before, don't recheck it--
	 doing that takes too much time and makes menus too slow.  */
      && !(!NILP (cachelist) && NILP (savedkey)))
    {
      changed = 1;
      descrip = Qnil;
      savedkey = Fwhere_is_internal (def, Qnil, Qt, Qnil);
      /* If the command is an alias for another
	 (such as easymenu.el and lmenu.el set it up),
	 see if the original command name has equivalent keys.  */
      if (SYMBOLP (def) && SYMBOLP (XSYMBOL (def)->function))
	savedkey = Fwhere_is_internal (XSYMBOL (def)->function,
				       Qnil, Qt, Qnil);
      
      if (VECTORP (savedkey)
	  && EQ (XVECTOR (savedkey)->contents[0], Qmenu_bar))
	savedkey = Qnil;
      if (!NILP (savedkey))
	{
	  descrip = Fkey_description (savedkey);
	  descrip = concat2 (make_string ("  (", 3), descrip);
	  descrip = concat2 (descrip, make_string (")", 1));
	}
    }
  
  /* Cache the data we just got in a sublist of the menu binding.  */
  if (NILP (cachelist))
    XCONS (item1)->cdr = Fcons (Fcons (savedkey, descrip), def);
  else if (changed)
    {
      XCONS (cachelist)->car = savedkey;
      XCONS (cachelist)->cdr = descrip;
    }

  UNGCPRO;
  *descrip_ptr = descrip;
  return def;
}

/* This is used as the handler when calling internal_condition_case_1.  */

static Lisp_Object 
menu_item_enabled_p_1 (arg)
     Lisp_Object arg;
{
  return Qnil;
}

/* Return non-nil if the command DEF is enabled when used as a menu item.
   This is based on looking for a menu-enable property.
   If NOTREAL is set, don't bother really computing this.  */

static Lisp_Object 
menu_item_enabled_p (def, notreal)
     Lisp_Object def;
{
  Lisp_Object enabled, tem;

  enabled = Qt;
  if (notreal)
    return enabled;
  if (XTYPE (def) == Lisp_Symbol)
    {
      /* No property, or nil, means enable.
	 Otherwise, enable if value is not nil.  */
      tem = Fget (def, Qmenu_enable);
      if (!NILP (tem))
	/* (condition-case nil (eval tem)
	   (error nil))  */
	enabled = internal_condition_case_1 (Feval, tem, Qerror,
					     menu_item_enabled_p_1);
    }
  return enabled;
}

/* 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 HMENU 
keymap_panes (lpmm, keymaps, nmaps, notreal)
     menu_map * lpmm;
     Lisp_Object *keymaps;
     int nmaps;
     int notreal;
{
  int mapno;
  
  //    init_menu_items (lpmm);
  
  if (nmaps > 1) 
    {
      HMENU hmenu;
      
      if (!notreal) 
	{
	  hmenu = CreateMenu ();
	    
	  if (!hmenu) return (NULL);
	} 
      else 
	{
	  hmenu = NULL;
	}
      
      /* 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++)
	{
	  HMENU new_hmenu;
	  
	  new_hmenu = single_keymap_panes (lpmm, keymaps[mapno],
					   Qnil, Qnil, notreal);
	  
	  if (!notreal && new_hmenu)
	    {
	      AppendMenu (hmenu, MF_POPUP, (UINT)new_hmenu, "");
	    }
	}

	return (hmenu);
    } 
  else 
    {
      return (single_keymap_panes (lpmm, keymaps[0], Qnil, Qnil, notreal));
    }
}

/* 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,
   don't bother really computing whether an item is enabled.  */

HMENU 
single_keymap_panes (lpmm, keymap, pane_name, prefix, notreal)
     menu_map * lpmm;
     Lisp_Object keymap;
     Lisp_Object pane_name;
     Lisp_Object prefix;
     int notreal;
{
  Lisp_Object pending_maps;
  Lisp_Object tail, item, item1, item_string, table;
  HMENU hmenu;
  struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
  
  if (!notreal) 
    {
      hmenu = CreateMenu ();
      if (hmenu == NULL) return NULL;
    } 
  else 
    {
      hmenu = NULL;
    }
  
  pending_maps = Qnil;
  
  for (tail = keymap; XTYPE (tail) == Lisp_Cons; tail = XCONS (tail)->cdr)
    {
      /* Look at each key binding, and if it has a menu string,
	 make a menu item from it.  */
      
      item = XCONS (tail)->car;
      
      if (CONSP (item))
	{
	  item1 = XCONS (item)->cdr;
	  
	  if (XTYPE (item1) == Lisp_Cons)
	    {
	      item_string = XCONS (item1)->car;
	      if (XTYPE (item_string) == Lisp_String)
		{
		  /* This is the real definition--the function to run.  */
		  
		  Lisp_Object def;
		  
		  /* These are the saved equivalent keyboard key sequence
		     and its key-description.  */
		  
		  Lisp_Object descrip;
		  Lisp_Object tem, enabled;
		  
		  /* GCPRO because ...enabled_p will call eval
		     and ..._equiv_key may autoload something.
		     Protecting KEYMAP preserves everything we use;
		     aside from that, must protect whatever might be
		     a string.  Since there's no GCPRO5, we refetch
		     item_string instead of protecting it.  */
		  
		  descrip = def = Qnil;
		  GCPRO4 (keymap, pending_maps, def, prefix);
		  
		  def = menu_item_equiv_key (item_string, item1, &descrip);
		  enabled = menu_item_enabled_p (def, notreal);
		    
		  UNGCPRO;
		  
		  item_string = XCONS (item1)->car;
		  
		  tem = Fkeymapp (def);
		  if (XSTRING (item_string)->data[0] == '@' && !NILP (tem))
		    {
		      pending_maps = Fcons (Fcons (def, 
						   Fcons (item_string, 
							  XCONS (item)->car)),
					    pending_maps);
		    }
		  else
		    {
		      Lisp_Object submap;

		      GCPRO4 (keymap, pending_maps, item, item_string);
		      
		      submap = get_keymap_1 (def, 0, 1);
		      
		      UNGCPRO;
		      
		      if (NILP (submap))
			{
			  if (!notreal) 
			    {
			      add_menu_item (lpmm,
					     hmenu,
					     item_string,
					     !NILP (enabled),
					     Fcons (XCONS (item)->car, prefix));
			    }
			}
		      else
			/* Display a submenu.  */
			{
			  HMENU new_hmenu = single_keymap_panes (lpmm,
								 submap,
								 item_string,
								 XCONS (item)->car,
								 notreal);

			  if (!notreal)
			    {
			      AppendMenu (hmenu, MF_POPUP,
					  (UINT)new_hmenu,
					  (char *) XSTRING (item_string)->data);
			    }
			}
		    }
		}
	    }
	}
      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);
	      item1 = XVECTOR (item)->contents[c];
	      if (CONSP (item1))
		{
		  item_string = XCONS (item1)->car;
		  if (STRINGP (item_string))
		    {
		      Lisp_Object def;
		      
		      /* These are the saved equivalent keyboard key sequence
			 and its key-description.  */
		      Lisp_Object descrip;
		      Lisp_Object tem, enabled;
		      
		      /* GCPRO because ...enabled_p will call eval
			 and ..._equiv_key may autoload something.
			 Protecting KEYMAP preserves everything we use;
			 aside from that, must protect whatever might be
			 a string.  Since there's no GCPRO5, we refetch
			 item_string instead of protecting it.  */
		      GCPRO4 (keymap, pending_maps, def, descrip);
		      descrip = def = Qnil;
		      
		      def = menu_item_equiv_key (item_string, item1, &descrip);
		      enabled = menu_item_enabled_p (def, notreal);
		      
		      UNGCPRO;
		      
		      item_string = XCONS (item1)->car;
		      
		      tem = Fkeymapp (def);
		      if (XSTRING (item_string)->data[0] == '@' && !NILP (tem))
			pending_maps = Fcons (Fcons (def, Fcons (item_string, character)),
					      pending_maps);
		      else
			{
			  Lisp_Object submap;
			  
			  GCPRO4 (keymap, pending_maps, descrip, item_string);
			    
			  submap = get_keymap_1 (def, 0, 1);
			  
			  UNGCPRO;
			  
			  if (NILP (submap))
			    {
			      if (!notreal) 
				{
				  add_menu_item (lpmm,
						 hmenu,
						 item_string,
						 !NILP (enabled),
						 character);
				}
			    }
			  else
			    /* Display a submenu.  */
			    {
			      HMENU new_hmenu = single_keymap_panes (lpmm,
								     submap,
								     Qnil,
								     character,
								     notreal);
			      
			      if (!notreal)
				{
				  AppendMenu (hmenu,MF_POPUP,
					      (UINT)new_hmenu,
					      (char *)XSTRING (item_string)->data);
				}
			    }
			}
		    }
		}
	    }
	}
    }

  /* 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 = XCONS (elt)->cdr;
      string = XCONS (eltcdr)->car;
      /* We no longer discard the @ from the beginning of the string here.
	 Instead, we do this in win32menu_show.  */
      {
	HMENU new_hmenu = single_keymap_panes (lpmm,
					       Fcar (elt),
					       string,
					       XCONS (eltcdr)->cdr, notreal);
	    
	if (!notreal)
	  {
	    AppendMenu (hmenu, MF_POPUP,
			(UINT)new_hmenu,
			(char *) XSTRING (string)->data);
	  }
      }

      pending_maps = Fcdr (pending_maps);
    }
  
    return (hmenu);
}

/* 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 HMENU 
list_of_panes (lpmm, menu)
     menu_map * lpmm;
     Lisp_Object menu;
{
  Lisp_Object tail;
  HMENU hmenu;
  
  hmenu = CreateMenu ();
  if (hmenu == NULL) return NULL;
  
  //    init_menu_items (lpmm);
  
  for (tail = menu; !NILP (tail); tail = Fcdr (tail))
    {
      Lisp_Object elt, pane_name, pane_data;
      HMENU new_hmenu;

      elt = Fcar (tail);
      pane_name = Fcar (elt);
      CHECK_STRING (pane_name, 0);
      pane_data = Fcdr (elt);
      CHECK_CONS (pane_data, 0);

      new_hmenu = list_of_items (lpmm, pane_data);
      if (new_hmenu == NULL) goto error;

      AppendMenu (hmenu, MF_POPUP, (UINT)new_hmenu,
		  (char *) XSTRING (pane_name)->data);
    }

  return (hmenu);
  
 error:
  DestroyMenu (hmenu);
  
  return (NULL);
}

/* Push the items in a single pane defined by the alist PANE.  */

static HMENU 
list_of_items (lpmm, pane)
     menu_map * lpmm;
     Lisp_Object pane;
{
  Lisp_Object tail, item, item1;
  HMENU hmenu;

  hmenu = CreateMenu ();
  if (hmenu == NULL) return NULL;

  for (tail = pane; !NILP (tail); tail = Fcdr (tail))
    {
      item = Fcar (tail);
      if (STRINGP (item))
	add_menu_item (lpmm, hmenu, item, Qnil, Qnil);
      else if (NILP (item))
	add_left_right_boundary ();
      else
	{
	  CHECK_CONS (item, 0);
	  item1 = Fcar (item);
	  CHECK_STRING (item1, 1);
	  add_menu_item (lpmm, hmenu, item1, Qt, Fcdr (item));
	}
    }

  return (hmenu);
}


HMENU 
create_menu_items (lpmm, menu, notreal)
     menu_map * lpmm;
     Lisp_Object menu;
     int notreal;
{
  Lisp_Object title;
  Lisp_Object keymap, tem;
  HMENU hmenu;
  
  title = Qnil;
  
  /* Decode the menu items from what was specified.  */
  
  keymap = Fkeymapp (menu);
  tem = Qnil;
  if (XTYPE (menu) == Lisp_Cons)
    tem = Fkeymapp (Fcar (menu));
  
  if (!NILP (keymap))
    {
      /* We were given a keymap.  Extract menu info from the keymap.  */
      Lisp_Object prompt;
      keymap = get_keymap (menu);
	
      /* Extract the detailed info to make one pane.  */
      hmenu = keymap_panes (lpmm, &keymap, 1, notreal);
	
#if 0
      /* Search for a string appearing directly as an element of the keymap.
	 That string is the title of the menu.  */
      prompt = map_prompt (keymap);

      /* 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;
#endif
    }
  else if (!NILP (tem))
    {
      /* 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; XTYPE (tem) == Lisp_Cons; tem = Fcdr (tem))
	{
	  Lisp_Object prompt;
	    
	  maps[i++] = keymap = get_keymap (Fcar (tem));
#if 0	    
	  prompt = map_prompt (keymap);
	  if (NILP (title) && !NILP (prompt))
	    title = prompt;
#endif
	}
      
      /* Extract the detailed info to make one pane.  */
      hmenu = keymap_panes (lpmm, maps, nmaps, notreal);
	
#if 0
      /* 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;
#endif
    }
  else
    {
      /* We were given an old-fashioned menu.  */
      title = Fcar (menu);
      CHECK_STRING (title, 1);
	
      hmenu = list_of_panes (lpmm, Fcdr (menu));
    }
  
  return (hmenu);
}

/* 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,
   don't bother really computing whether an item is enabled.  */

Lisp_Object 
get_single_keymap_event (keymap, lpnum)
     Lisp_Object keymap;
     int * lpnum;
{
  Lisp_Object pending_maps;
  Lisp_Object tail, item, item1, item_string, table;
  struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
  
  pending_maps = Qnil;
  
  for (tail = keymap; XTYPE (tail) == Lisp_Cons; tail = XCONS (tail)->cdr)
    {
      /* Look at each key binding, and if it has a menu string,
	 make a menu item from it.  */
      
      item = XCONS (tail)->car;
      
      if (XTYPE (item) == Lisp_Cons)
	{
	  item1 = XCONS (item)->cdr;
	  
	  if (CONSP (item1))
	    {
	      item_string = XCONS (item1)->car;
	      if (XTYPE (item_string) == Lisp_String)
		{
		  /* This is the real definition--the function to run.  */
		  
		  Lisp_Object def;
		  
		  /* These are the saved equivalent keyboard key sequence
		     and its key-description.  */
		  
		  Lisp_Object descrip;
		  Lisp_Object tem, enabled;
		  
		  /* GCPRO because ...enabled_p will call eval
		     and ..._equiv_key may autoload something.
		     Protecting KEYMAP preserves everything we use;
		     aside from that, must protect whatever might be
		     a string.  Since there's no GCPRO5, we refetch
		     item_string instead of protecting it.  */
		  
		  descrip = def = Qnil;
		  GCPRO3 (keymap, pending_maps, def);
		  
		  def = menu_item_equiv_key (item_string, item1, &descrip);
		  
		  UNGCPRO;
		  
		  item_string = XCONS (item1)->car;
		  
		  tem = Fkeymapp (def);
		  if (XSTRING (item_string)->data[0] == '@' && !NILP (tem))
		    {
		      pending_maps = Fcons (Fcons (def, 
						   Fcons (item_string, 
							  XCONS (item)->car)),
					    pending_maps);
		    }
		  else
		    {
		      Lisp_Object submap;
		      
		      GCPRO4 (keymap, pending_maps, item, item_string);
		      
		      submap = get_keymap_1 (def, 0, 1);
		      
		      UNGCPRO;
		      
		      if (NILP (submap))
			{
			  if (--(*lpnum) == 0) 
			    {
			      return (Fcons (XCONS (item)->car, Qnil));
			    }
			}
		      else
			/* Display a submenu.  */
			{
			  Lisp_Object event = get_single_keymap_event (submap,
								       lpnum);
			  
			  if (*lpnum <= 0)
			    {
			      if (!NILP (XCONS (item)->car))
				event = Fcons (XCONS (item)->car, event);
			      
			      return (event);
			    }
			}
		    }
		}
	    }
	}
      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);
	      item1 = XVECTOR (item)->contents[c];
	      if (XTYPE (item1) == Lisp_Cons)
		{
		  item_string = XCONS (item1)->car;
		  if (XTYPE (item_string) == Lisp_String)
		    {
		      Lisp_Object def;
		      
		      /* These are the saved equivalent keyboard key sequence
			 and its key-description.  */
		      Lisp_Object descrip;
		      Lisp_Object tem, enabled;
		      
		      /* GCPRO because ...enabled_p will call eval
			 and ..._equiv_key may autoload something.
			 Protecting KEYMAP preserves everything we use;
			 aside from that, must protect whatever might be
			 a string.  Since there's no GCPRO5, we refetch
			 item_string instead of protecting it.  */
		      GCPRO4 (keymap, pending_maps, def, descrip);
		      descrip = def = Qnil;

		      def = menu_item_equiv_key (item_string, item1, &descrip);
		      
		      UNGCPRO;
		      
		      item_string = XCONS (item1)->car;
		      
		      tem = Fkeymapp (def);
		      if (XSTRING (item_string)->data[0] == '@' && !NILP (tem))
			pending_maps = Fcons (Fcons (def, Fcons (item_string, character)),
					      pending_maps);
		      else
			{
			  Lisp_Object submap;
			  
			  GCPRO4 (keymap, pending_maps, descrip, item_string);
			  
			  submap = get_keymap_1 (def, 0, 1);
			    
			  UNGCPRO;
			  
			  if (NILP (submap))
			    {
			      if (--(*lpnum) == 0) 
				{
				  return (Fcons (character, Qnil));
				}
			    }
			  else
			    /* Display a submenu.  */
			    {
			      Lisp_Object event = get_single_keymap_event (submap,
									   lpnum);
				
			      if (*lpnum <= 0)
				{
				  if (!NILP (character))
				    event = Fcons (character, event);
				    
				  return (event);
				}
			    }
			}
		    }
		}
	    }
	}
    }
  
  /* 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 = XCONS (elt)->cdr;
      string = XCONS (eltcdr)->car;
      /* We no longer discard the @ from the beginning of the string here.
	 Instead, we do this in win32menu_show.  */
      {
	Lisp_Object event = get_single_keymap_event (Fcar (elt), lpnum);

	if (*lpnum <= 0)
	  {
	    if (!NILP (XCONS (eltcdr)->cdr))
	      event = Fcons (XCONS (eltcdr)->cdr, event);

	    return (event);
	  }
      }

      pending_maps = Fcdr (pending_maps);
    }
  
  return (Qnil);
}

/* 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 Lisp_Object 
get_keymap_event (keymaps, nmaps, lpnum)
     Lisp_Object *keymaps;
     int nmaps;
     int * lpnum;
{
  int mapno;
  Lisp_Object event = Qnil;
  
  /* 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++)
    {
      event = get_single_keymap_event (keymaps[mapno], lpnum);

      if (*lpnum <= 0) break;
    }
  
  return (event);
}

static Lisp_Object 
get_list_of_items_event (pane, lpnum)
     Lisp_Object pane;
     int * lpnum;
{
  Lisp_Object tail, item, item1;
  
  for (tail = pane; !NILP (tail); tail = Fcdr (tail))
    {
      item = Fcar (tail);
      if (STRINGP (item))
	{
	  if (-- (*lpnum) == 0) 
	    {
	      return (Qnil);
	    }
	}
      else if (!NILP (item))
	{
	  if (--(*lpnum) == 0) 
	    {
	      CHECK_CONS (item, 0);
	      return (Fcdr (item));
	    }
	}
    }
  
  return (Qnil);
}

/* 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 Lisp_Object 
get_list_of_panes_event (menu, lpnum)
     Lisp_Object menu;
     int * lpnum;
{
  Lisp_Object tail;

  for (tail = menu; !NILP (tail); tail = Fcdr (tail))
    {
      Lisp_Object elt, pane_name, pane_data;
      Lisp_Object event;

      elt = Fcar (tail);
      pane_data = Fcdr (elt);
      CHECK_CONS (pane_data, 0);

      event = get_list_of_items_event (pane_data, lpnum);

      if (*lpnum <= 0) 
	{
	  return (event);
	}
    }

  return (Qnil);
}

Lisp_Object 
get_menu_event (menu, lpnum)
     Lisp_Object menu;
     int * lpnum;
{
  Lisp_Object keymap, tem;
  Lisp_Object event;
    
  /* Decode the menu items from what was specified.  */
    
  keymap = Fkeymapp (menu);
  tem = Qnil;
  if (XTYPE (menu) == Lisp_Cons)
    tem = Fkeymapp (Fcar (menu));

  if (!NILP (keymap))
    {
      keymap = get_keymap (menu);
	
      event = get_keymap_event (menu, 1, lpnum);
    }
  else if (!NILP (tem))
    {
      /* We were given a list of keymaps.  */
      int nmaps = XFASTINT (Flength (menu));
      Lisp_Object *maps
	= (Lisp_Object *) alloca (nmaps * sizeof (Lisp_Object));
      int i;
	
      /* The first keymap that has a prompt string
	 supplies the menu title.  */
      for (tem = menu, i = 0; XTYPE (tem) == Lisp_Cons; tem = Fcdr (tem))
	{
	  Lisp_Object prompt;
	    
	  maps[i++] = keymap = get_keymap (Fcar (tem));
	}
	
      event = get_keymap_event (maps, nmaps, lpnum);
    }
  else
    {
      /* We were given an old-fashioned menu.  */
      event = get_list_of_panes_event (Fcdr (menu), lpnum);
    }

  return (event);
}

DEFUN ("x-popup-menu", Fx_popup_menu, Sx_popup_menu, 2, 2, 0,
       "Pop up a deck-of-cards menu and return user's selection.\n\
POSITION is a position specification.  This is either a mouse button event\n\
or a list ((XOFFSET YOFFSET) WINDOW)\n\
where XOFFSET and YOFFSET are positions in pixels from the top left\n\
corner of WINDOW's frame.  (WINDOW may be a frame object instead of a window.)\n\
This controls the position of the center of the first line\n\
in the first pane of the menu, not the top left of the menu as a whole.\n\
If POSITION is t, it means to use the current mouse position.\n\
\n\
MENU is a specifier for a menu.  For the simplest case, MENU is a keymap.\n\
The menu items come from key bindings that have a menu string as well as\n\
a definition; actually, the \"definition\" in such a key binding looks like\n\
\(STRING . REAL-DEFINITION).  To give the menu a title, put a string into\n\
the keymap as a top-level element.\n\n\
You can also use a list of keymaps as MENU.\n\
  Then each keymap makes a separate pane.\n\
When MENU is a keymap or a list of keymaps, the return value\n\
is a list of events.\n\n\
Alternatively, you can specify a menu of multiple panes\n\
  with a list of the form (TITLE PANE1 PANE2...),\n\
where each pane is a list of form (TITLE ITEM1 ITEM2...).\n\
Each ITEM is normally a cons cell (STRING . VALUE);\n\
but a string can appear as an item--that makes a nonselectable line\n\
in the menu.\n\
With this form of menu, the return value is VALUE from the chosen item.\n\
\n\
If POSITION is nil, don't display the menu at all, just precalculate the\n\
cached information about equivalent key sequences.")
    (position, menu)
    Lisp_Object position, menu;
{
  int number_of_panes, panes;
  Lisp_Object keymap, tem;
  int xpos, ypos;
  Lisp_Object title;
  char *error_name;
  Lisp_Object selection;
  int i, j;
  FRAME_PTR f;
  Lisp_Object x, y, window;
  int keymaps = 0;
  int menubarp = 0;
  struct gcpro gcpro1;
  HMENU hmenu;
  menu_map mm;
  
  if (! NILP (position))
    {
      /* Decode the first argument: find the window and the coordinates.  */
      if (EQ (position, Qt))
	{
	  /* Use the mouse's current position.  */
	  FRAME_PTR new_f = 0;
	  Lisp_Object bar_window;
	  int part;
	  unsigned long time;
	  
	  if (mouse_position_hook)
	    (*mouse_position_hook) (&new_f, &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
	    {
	      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);

	      /* Determine whether this menu is handling a menu bar click.  */
	      tem = Fcar (Fcdr (Fcar (Fcdr (position))));
	      if (CONSP (tem) && EQ (Fcar (tem), Qmenu_bar))
		menubarp = 1;
	    }
	}
      
      CHECK_NUMBER (x, 0);
      CHECK_NUMBER (y, 0);

      /* Decode where to put the menu.  */
      
      if (FRAMEP (window))
	{
	  f = XFRAME (window);

	  xpos = 0;
	  ypos = 0;
	}
      else if (WINDOWP (window))
	{
	  CHECK_LIVE_WINDOW (window, 0);
	  f = XFRAME (WINDOW_FRAME (XWINDOW (window)));
	  
	  xpos = (FONT_WIDTH (f->output_data.win32->font) * XWINDOW (window)->left);
	  ypos = (f->output_data.win32->line_height * XWINDOW (window)->top);
	}
      else
	/* ??? Not really clean; should be CHECK_WINDOW_OR_FRAME,
	   but I don't want to make one now.  */
	CHECK_WINDOW (window, 0);
      
      xpos += XINT (x);
      ypos += XINT (y);
    }
  
  title = Qnil;
  GCPRO1 (title);
  
  discard_menu_items (&mm);
  hmenu = create_menu_items (&mm, menu, NILP (position));
  
  if (NILP (position))
    {
      discard_menu_items (&mm);
      UNGCPRO;
      return Qnil;
    }
  
  /* Display them in a menu.  */
  BLOCK_INPUT;
  
  selection = win32menu_show (f, xpos, ypos, menu, &hmenu, &error_name);
  
  UNBLOCK_INPUT;
  
  discard_menu_items (&mm);
  DestroyMenu (hmenu);
  
  UNGCPRO;
  
  if (error_name) error (error_name);
  return selection;
}

DEFUN ("x-popup-dialog", Fx_popup_dialog, Sx_popup_dialog, 2, 2, 0,
       "Pop up a dialog box and return user's selection.\n\
POSITION specifies which frame to use.\n\
This is normally a mouse button event or a window or frame.\n\
If POSITION is t, it means to use the frame the mouse is on.\n\
The dialog box appears in the middle of the specified frame.\n\
\n\
CONTENTS specifies the alternatives to display in the dialog box.\n\
It is a list of the form (TITLE ITEM1 ITEM2...).\n\
Each ITEM is a cons cell (STRING . VALUE).\n\
The return value is VALUE from the chosen item.\n\n\
An ITEM may also be just a string--that makes a nonselectable item.\n\
An ITEM may also be nil--that means to put all preceding items\n\
on the left of the dialog box and all following items on the right.\n\
\(By default, approximately half appear on each side.)")
    (position, contents)
    Lisp_Object position, contents;
{
  FRAME_PTR f;
  Lisp_Object window;
  
  /* Decode the first argument: find the window or frame to use.  */
  if (EQ (position, Qt))
    {
      /* Decode the first argument: find the window and the coordinates.  */
      if (EQ (position, Qt))
	window = selected_window;
    }
  else if (CONSP (position))
    {
      Lisp_Object tem;
      tem = Fcar (position);
      if (XTYPE (tem) == Lisp_Cons)
	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;
  
  /* Decode where to put the menu.  */
  
  if (FRAMEP (window))
    f = XFRAME (window);
  else if (WINDOWP (window))
    {
      CHECK_LIVE_WINDOW (window, 0);
      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, 0);
  
#if 1
  /* 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
  {
    Lisp_Object title;
    char *error_name;
    Lisp_Object selection;

    /* Decode the dialog items from what was specified.  */
    title = Fcar (contents);
    CHECK_STRING (title, 1);

    list_of_panes (Fcons (contents, Qnil));

    /* Display them in a dialog box.  */
    BLOCK_INPUT;
    selection = win32_dialog_show (f, 0, 0, title, &error_name);
    UNBLOCK_INPUT;

    discard_menu_items ();

    if (error_name) error (error_name);
    return selection;
  }
#endif
}

Lisp_Object 
get_frame_menubar_event (f, num)
     FRAME_PTR f;
     int num;
{
  Lisp_Object tail, items;
  int i;
  struct gcpro gcpro1;
  
  BLOCK_INPUT;
  
  GCPRO1 (items);
  
  if (NILP (items = FRAME_MENU_BAR_ITEMS (f)))
    items = FRAME_MENU_BAR_ITEMS (f) = menu_bar_items (FRAME_MENU_BAR_ITEMS (f));
  
  for (i = 0; i < XVECTOR (items)->size; i += 3)
    {
      Lisp_Object event;
	
      event = get_menu_event (XVECTOR (items)->contents[i + 2], &num);

      if (num <= 0)
	{
	  UNGCPRO;
	  UNBLOCK_INPUT;
	  return (Fcons (XVECTOR (items)->contents[i], event));
	}
    }
  
  UNGCPRO;
  UNBLOCK_INPUT;
  
  return (Qnil);
}

void 
set_frame_menubar (f, first_time)
     FRAME_PTR f;
     int first_time;
{
  Lisp_Object tail, items;
  HMENU hmenu;
  int i;
  struct gcpro gcpro1;
  menu_map mm;
  
  BLOCK_INPUT;
  
  GCPRO1 (items);
  
  if (NILP (items = FRAME_MENU_BAR_ITEMS (f)))
    items = FRAME_MENU_BAR_ITEMS (f) = menu_bar_items (FRAME_MENU_BAR_ITEMS (f));
  
  hmenu = CreateMenu ();
  
  if (!hmenu) goto error;
  
  discard_menu_items (&mm);

  for (i = 0; i < XVECTOR (items)->size; i += 3)
    {
      Lisp_Object string;
      int keymaps;
      CHAR *error;
      HMENU new_hmenu;
      
      string = XVECTOR (items)->contents[i + 1];
      if (NILP (string))
	break;
      
      new_hmenu = create_menu_items (&mm,
				     XVECTOR (items)->contents[i + 2],
				     0);
      
      if (!new_hmenu)
	continue;
      
      AppendMenu (hmenu, MF_POPUP, (UINT)new_hmenu,
		  (char *) XSTRING (string)->data);
    }
  
  {
    HMENU old = GetMenu (FRAME_WIN32_WINDOW (f));
    SetMenu (FRAME_WIN32_WINDOW (f), hmenu);
    DestroyMenu (old);
  }
  
 error:
  UNGCPRO;
  UNBLOCK_INPUT;
}

void 
free_frame_menubar (f)
     FRAME_PTR f;
{
  BLOCK_INPUT;

  {
    HMENU old = GetMenu (FRAME_WIN32_WINDOW (f));
    SetMenu (FRAME_WIN32_WINDOW (f), NULL);
    DestroyMenu (old);
  }
    
  UNBLOCK_INPUT;
}
/* Called from Fwin32_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;
{
  set_frame_menubar (f, 1);
}

#if 0
/* If the mouse has moved to another menu bar item,
   return 1 and unread a button press event for that item.
   Otherwise return 0.  */

static int
check_mouse_other_menu_bar (f)
     FRAME_PTR f;
{
  FRAME_PTR new_f;
  Lisp_Object bar_window;
  int part;
  Lisp_Object x, y;
  unsigned long time;

  (*mouse_position_hook) (&new_f, &bar_window, &part, &x, &y, &time);

  if (f == new_f && other_menu_bar_item_p (f, x, y))
    {
      unread_menu_bar_button (f, x);
      return 1;
    }

  return 0;
}
#endif


#if 0
static HMENU 
create_menu (keymaps, error)
     int keymaps;
     char **error;
{
  HMENU hmenu = NULL;   /* the menu we are currently working on */
  HMENU first_hmenu = NULL;
  
  HMENU *submenu_stack = (HMENU *) alloca (menu_items_used * sizeof (HMENU));
  Lisp_Object *subprefix_stack = (Lisp_Object *) alloca (menu_items_used *
							 sizeof (Lisp_Object));
  int submenu_depth = 0;
  int i;
  
  if (menu_items_used <= MENU_ITEMS_PANE_LENGTH)
    {
      *error = "Empty menu";
      return NULL;
    }
  
  i = 0;
  
  /* Loop over all panes and items, filling in the tree.  */
  
  while (i < menu_items_used)
    {
      if (EQ (XVECTOR (menu_items)->contents[i], Qnil))
	{
	  submenu_stack[submenu_depth++] = hmenu;
	  i++;
	}
      else if (EQ (XVECTOR (menu_items)->contents[i], Qlambda))
	{
	  hmenu = submenu_stack[--submenu_depth];
	  i++;
	}
#if 0
else if (EQ (XVECTOR (menu_items)->contents[i], Qt)
	 && submenu_depth != 0)
  i += MENU_ITEMS_PANE_LENGTH;
#endif
      /* 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;
    char *pane_string;
    
    pane_name = XVECTOR (menu_items)->contents[i + MENU_ITEMS_PANE_NAME];
    pane_string = (NILP (pane_name) ? "" : (char *) XSTRING (pane_name)->data);
    
    if (!hmenu || strcmp (pane_string, ""))
      {
	HMENU new_hmenu = CreateMenu ();
	
	if (!new_hmenu) 
	  {
	    *error = "Could not create menu pane";
	    goto error;
	  }
	
	if (hmenu)
	  {
	    AppendMenu (hmenu, MF_POPUP, (UINT)new_hmenu, pane_string);
	  }
	
	hmenu = new_hmenu;
	
	if (!first_hmenu) first_hmenu = hmenu;
      }
    i += MENU_ITEMS_PANE_LENGTH;
  }
else
  {
    /* Create a new item within current pane.  */

    Lisp_Object item_name, enable, descrip;
    UINT fuFlags;

    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];

    if (((char *) XSTRING (item_name)->data)[0] == 0
	|| strcmp ((char *) XSTRING (item_name)->data, "--") == 0)
      fuFlags = MF_SEPARATOR;
    else if (NILP (enable) || !XUINT(enable))
      fuFlags = MF_STRING | MF_GRAYED;
    else
      fuFlags = MF_STRING;

    AppendMenu (hmenu,
		fuFlags,
		i,
		(char *) XSTRING (item_name)->data);

    //	  if (!NILP (descrip))
      //	    hmenu->key = (char *) XSTRING (descrip)->data;

    i += MENU_ITEMS_ITEM_LENGTH;
  }
}

  return (first_hmenu);
  
 error:
  if (first_hmenu) DestroyMenu (first_hmenu);
  return (NULL);
}

#endif

/* win32menu_show actually displays a menu using the panes and items in 
   menu_items and returns the value selected from it.
   There are two versions of win32menu_show, one for Xt and one for Xlib.
   Both 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.
   MENUBARP is 1 if the click that asked for this menu came from the menu bar.
   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 
win32menu_show (f, x, y, menu, hmenu, error)
     FRAME_PTR f;
     int x;
     int y;
     Lisp_Object menu;
     HMENU hmenu;
     char **error;
{
  int i , menu_selection;
  POINT pos;
  
  *error = NULL;
  
  if (!hmenu)
    {
      *error = "Empty menu";
      return Qnil;
    }
  
  pos.x = x;
  pos.y = y;
    
  /* Offset the coordinates to root-relative.  */
  ClientToScreen (FRAME_WIN32_WINDOW (f), &pos);
  
#if 0
  /* If the mouse moves out of the menu before we show the menu,
     don't show it at all.  */
  if (check_mouse_other_menu_bar (f))
    {
      DestroyMenu (hmenu);
      return Qnil;
    }
#endif
  
  /* Display the menu.  */
  menu_selection = TrackPopupMenu (hmenu,
				   0x10,
				   pos.x, pos.y,
				   0,
				   FRAME_WIN32_WINDOW (f),
				   NULL);
  if (menu_selection == -1)
    {
      *error = "Invalid menu specification";
      return Qnil;
    }
  
  /* Find the selected item, and its pane, to return
     the proper value.  */
  
#if 1
  if (menu_selection > 0)
    {
      return get_menu_event (menu, menu_selection);
    }
#else
  if (menu_selection > 0 && menu_selection <= lpmm->menu_items_used)
    {
      return (XVECTOR (lpmm->menu_items)->contents[menu_selection - 1]);
    }
#endif
  
  return Qnil;
}

#if 0
static char * button_names [] = 
{
  "button1", "button2", "button3", "button4", "button5",
  "button6", "button7", "button8", "button9", "button10" 
};

static Lisp_Object
win32_dialog_show (f, menubarp, keymaps, title, error)
     FRAME_PTR f;
     int menubarp;
     int keymaps;
     Lisp_Object title;
     char **error;
{
  int i, nb_buttons=0;
  HMENU hmenu;
  char dialog_name[6];
  
  /* 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 *) XSTRING (pane_name)->data);  
    prev_wv = malloc_widget_value ();
    prev_wv->value = pane_string;
    if (keymaps && !NILP (prefix))
      prev_wv->name++;
    prev_wv->enabled = 1;
    prev_wv->name = "message";
    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;
	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];
	
	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 >= 10)
	  {
	    free_menubar_widget_value_tree (first_wv);
	    *error = "Too many dialog items";
	    return Qnil;
	  }
	
	wv = malloc_widget_value ();
	prev_wv->next = wv;
	wv->name = (char *) button_names[nb_buttons];
	if (!NILP (descrip))
	  wv->key = (char *) XSTRING (descrip)->data;
	wv->value = (char *) XSTRING (item_name)->data;
	wv->call_data = (void *) &XVECTOR (menu_items)->contents[i];
	wv->enabled = !NILP (enable);
	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 = malloc_widget_value ();
    wv->name = dialog_name;
    
    /* 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.  */
  dialog_id = ++popup_id_tick;
  menu = lw_create_widget (first_wv->name, "dialog", dialog_id, first_wv,
			   f->output_data.win32->widget, 1, 0,
			   dialog_selection_callback, 0);
#if 0 /* This causes crashes, and seems to be redundant -- rms.  */
  lw_modify_all_widgets (dialog_id, first_wv, True);
#endif
  lw_modify_all_widgets (dialog_id, first_wv->contents, True);
  /* Free the widget_value objects we used to specify the contents.  */
  free_menubar_widget_value_tree (first_wv);
  
  /* No selection has been chosen yet.  */
  menu_item_selection = 0;
  
  /* Display the menu.  */
  lw_pop_up_all_widgets (dialog_id);
  
  /* Process events that apply to the menu.  */
  while (1)
    {
      XEvent event;
      
      XtAppNextEvent (Xt_app_con, &event);
      if (event.type == ButtonRelease)
	{
	  XtDispatchEvent (&event);
	  break;
	}
      else if (event.type == Expose)
	    process_expose_from_menu (event);
	XtDispatchEvent (&event);
      if (XtWindowToWidget(XDISPLAY event.xany.window) != menu)
	{
	  queue_tmp = (struct event_queue *) malloc (sizeof (struct event_queue));

	  if (queue_tmp != NULL) 
	    {
	      queue_tmp->event = event;
	      queue_tmp->next = queue;
	      queue = queue_tmp;
	    }
	}
    }
 pop_down:

  /* State that no mouse buttons are now held.
     That is not necessarily true, but the fiction leads to reasonable
     results, and it is a pain to ask which are actually held now
     or track this in the loop above.  */
  win32_mouse_grabbed = 0;
  
  /* Unread any events that we got but did not handle.  */
  while (queue != NULL) 
    {
      queue_tmp = queue;
      XPutBackEvent (XDISPLAY &queue_tmp->event);
      queue = queue_tmp->next;
      free ((char *)queue_tmp);
      /* Cause these events to get read as soon as we UNBLOCK_INPUT.  */
      interrupt_input_pending = 1;
    }
  
  /* 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 == &XVECTOR (menu_items)->contents[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

syms_of_win32menu ()
{
  defsubr (&Sx_popup_menu);
  defsubr (&Sx_popup_dialog);
}
