gtkutil.c 111 KB
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/* Functions for creating and updating GTK widgets.
   Copyright (C) 2003
   Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include "config.h"

#ifdef USE_GTK
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#include <string.h>
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#include <signal.h>
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#include <stdio.h>
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#include "lisp.h"
#include "xterm.h"
#include "blockinput.h"
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#include "syssignal.h"
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#include "window.h"
#include "atimer.h"
#include "gtkutil.h"
#include "termhooks.h"
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#include "keyboard.h"
#include "charset.h"
#include "coding.h"
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#include <gdk/gdkkeysyms.h>

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#define FRAME_TOTAL_PIXEL_HEIGHT(f) \
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  (FRAME_PIXEL_HEIGHT (f) + FRAME_MENUBAR_HEIGHT (f) + FRAME_TOOLBAR_HEIGHT (f))
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/***********************************************************************
                      Display handling functions
 ***********************************************************************/

#ifdef HAVE_GTK_MULTIDISPLAY

/* Return the GdkDisplay that corresponds to the X display DPY.  */
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static GdkDisplay *
xg_get_gdk_display (dpy)
     Display *dpy;
{
  return gdk_x11_lookup_xdisplay (dpy);
}

/* When the GTK widget W is to be created on a display for F that
   is not the default display, set the display for W.
   W can be a GtkMenu or a GtkWindow widget.  */
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static void
xg_set_screen (w, f)
     GtkWidget *w;
     FRAME_PTR f;
{
  if (FRAME_X_DISPLAY (f) != GDK_DISPLAY ())
    {
      GdkDisplay *gdpy = gdk_x11_lookup_xdisplay (FRAME_X_DISPLAY (f));
      GdkScreen *gscreen = gdk_display_get_default_screen (gdpy);

      if (GTK_IS_MENU (w))
        gtk_menu_set_screen (GTK_MENU (w), gscreen);
      else
        gtk_window_set_screen (GTK_WINDOW (w), gscreen);
    }
}


#else /* not HAVE_GTK_MULTIDISPLAY */

/* Make some defines so we can use the GTK 2.2 functions when
   compiling with GTK 2.0.  */
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#define xg_set_screen(w, f)
#define gdk_xid_table_lookup_for_display(dpy, w)    gdk_xid_table_lookup (w)
#define gdk_pixmap_foreign_new_for_display(dpy, p)  gdk_pixmap_foreign_new (p)
#define gdk_cursor_new_for_display(dpy, c)          gdk_cursor_new (c)
#define gdk_x11_lookup_xdisplay(dpy)                0
#define GdkDisplay                                  void

#endif /* not HAVE_GTK_MULTIDISPLAY */

/* Open a display named by DISPLAY_NAME.  The display is returned in *DPY.
   *DPY is set to NULL if the display can't be opened.

   Returns non-zero if display could be opened, zero if display could not
   be opened, and less than zero if the GTK version doesn't support
   multipe displays.  */
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int
xg_display_open (display_name, dpy)
     char *display_name;
     Display **dpy;
{
#ifdef HAVE_GTK_MULTIDISPLAY
  GdkDisplay *gdpy;

  gdpy = gdk_display_open (display_name);
  *dpy = gdpy ? GDK_DISPLAY_XDISPLAY (gdpy) : NULL;

  return gdpy != NULL;

#else /* not HAVE_GTK_MULTIDISPLAY */

  return -1;
#endif /* not HAVE_GTK_MULTIDISPLAY */
}


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/* Close display DPY.  */

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void
xg_display_close (Display *dpy)
{
#ifdef HAVE_GTK_MULTIDISPLAY
  GdkDisplay *gdpy = gdk_x11_lookup_xdisplay (dpy);

  /* GTK 2.2 has a bug that makes gdk_display_close crash (bug
     http://bugzilla.gnome.org/show_bug.cgi?id=85715).  This way
     we can continue running, but there will be memory leaks.  */

#if GTK_MAJOR_VERSION == 2 && GTK_MINOR_VERSION < 4

  /* If this is the default display, we must change it before calling
     dispose, otherwise it will crash.  */
  if (gdk_display_get_default () == gdpy)
    {
      struct x_display_info *dpyinfo;
      Display *new_dpy = 0;
      GdkDisplay *gdpy_new;

      /* Find another display.  */
      for (dpyinfo = x_display_list; dpyinfo; dpyinfo = dpyinfo->next)
        if (dpyinfo->display != dpy)
          {
            new_dpy = dpyinfo->display;
            break;
          }

      if (! new_dpy) return; /* Emacs will exit anyway.  */

      gdpy_new = gdk_x11_lookup_xdisplay (new_dpy);
      gdk_display_manager_set_default_display (gdk_display_manager_get (),
                                               gdpy_new);
    }

  g_object_run_dispose (G_OBJECT (gdpy));

#else
  /* I hope this will be fixed in GTK 2.4.  It is what bug 85715 says.  */
  gdk_display_close (gdpy);
#endif
#endif /* HAVE_GTK_MULTIDISPLAY */
}
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/***********************************************************************
                      Utility functions
 ***********************************************************************/
/* The timer for scroll bar repetition and menu bar timeouts.
   NULL if no timer is started.  */
static struct atimer *xg_timer;


/* The next two variables and functions are taken from lwlib.  */
static widget_value *widget_value_free_list;
static int malloc_cpt;

/* Allocate a widget_value structure, either by taking one from the
   widget_value_free_list or by malloc:ing a new one.

   Return a pointer to the allocated structure.  */
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widget_value *
malloc_widget_value ()
{
  widget_value *wv;
  if (widget_value_free_list)
    {
      wv = widget_value_free_list;
      widget_value_free_list = wv->free_list;
      wv->free_list = 0;
    }
  else
    {
      wv = (widget_value *) malloc (sizeof (widget_value));
      malloc_cpt++;
    }
  memset (wv, 0, sizeof (widget_value));
  return wv;
}

/* This is analogous to free.  It frees only what was allocated
   by malloc_widget_value, and no substructures.  */
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void
free_widget_value (wv)
     widget_value *wv;
{
  if (wv->free_list)
    abort ();

  if (malloc_cpt > 25)
    {
      /* When the number of already allocated cells is too big,
	 We free it.  */
      free (wv);
      malloc_cpt--;
    }
  else
    {
      wv->free_list = widget_value_free_list;
      widget_value_free_list = wv;
    }
}


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/* Create and return the cursor to be used for popup menus and
   scroll bars on display DPY.  */
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GdkCursor *
xg_create_default_cursor (dpy)
     Display *dpy;
{
  GdkDisplay *gdpy = gdk_x11_lookup_xdisplay (dpy);
  return gdk_cursor_new_for_display (gdpy, GDK_LEFT_PTR);
}

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/* For the image defined in IMG, make and return a GtkImage.  For displays with
   8 planes or less we must make a GdkPixbuf and apply the mask manually.
   Otherwise the highlightning and dimming the tool bar code in GTK does
   will look bad.  For display with more than 8 planes we just use the
   pixmap and mask directly.  For monochrome displays, GTK doesn't seem
   able to use external pixmaps, it looks bad whatever we do.
   The image is defined on the display where frame F is.
   WIDGET is used to find the GdkColormap to use for the GdkPixbuf.
   If OLD_WIDGET is NULL, a new widget is constructed and returned.
   If OLD_WIDGET is not NULL, that widget is modified.  */
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static GtkWidget *
xg_get_image_for_pixmap (f, img, widget, old_widget)
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     FRAME_PTR f;
     struct image *img;
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     GtkWidget *widget;
     GtkImage *old_widget;
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{
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  GdkPixmap *gpix;
  GdkPixmap *gmask;
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  GdkDisplay *gdpy;

  /* If we are on a one bit display, let GTK do all the image handling.
     This seems to be the only way to make insensitive and activated icons
     look good.  */
  if (x_screen_planes (f) == 1)
    {
      Lisp_Object specified_file = Qnil;
      Lisp_Object tail;
      extern Lisp_Object QCfile;

      for (tail = XCDR (img->spec);
	   NILP (specified_file) && CONSP (tail) && CONSP (XCDR (tail));
	   tail = XCDR (XCDR (tail)))
	if (EQ (XCAR (tail), QCfile))
	  specified_file = XCAR (XCDR (tail));

	if (STRINGP (specified_file))
	  {

	    Lisp_Object file = Qnil;
	    struct gcpro gcpro1;
	    GCPRO1 (file);

	    file = x_find_image_file (specified_file);
	    /* We already loaded the image once before calling this
	       function, so this should not fail.  */
	    xassert (STRINGP (file) != 0);

	    if (! old_widget)
	      old_widget = GTK_IMAGE (gtk_image_new_from_file (SDATA (file)));
	    else
	      gtk_image_set_from_file (old_widget, SDATA (file));

	    UNGCPRO;
	    return GTK_WIDGET (old_widget);
	  }
    }
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  gdpy = gdk_x11_lookup_xdisplay (FRAME_X_DISPLAY (f));
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  gpix = gdk_pixmap_foreign_new_for_display (gdpy, img->pixmap);
  gmask = img->mask ? gdk_pixmap_foreign_new_for_display (gdpy, img->mask) : 0;

  if (x_screen_planes (f) > 8 || x_screen_planes (f) == 1)
    {
      if (! old_widget)
        old_widget = GTK_IMAGE (gtk_image_new_from_pixmap (gpix, gmask));
      else
        gtk_image_set_from_pixmap (old_widget, gpix, gmask);
    }
  else
    {
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      /* This is a workaround to make icons look good on pseudo color
         displays.  Apparently GTK expects the images to have an alpha
         channel.  If they don't, insensitive and activated icons will
         look bad.  This workaround does not work on monochrome displays,
         and is not needed on true color/static color displays (i.e.
         16 bits and higher).  */
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      int x, y, width, height, rowstride, mask_rowstride;
      GdkPixbuf *icon_buf, *tmp_buf;
      guchar *pixels;
      guchar *mask_pixels;

      gdk_drawable_get_size (gpix, &width, &height);
      tmp_buf = gdk_pixbuf_get_from_drawable (NULL,
                                              gpix,
				              gtk_widget_get_colormap (widget),
                                              0, 0, 0, 0, width, height);
      icon_buf = gdk_pixbuf_add_alpha (tmp_buf, FALSE, 0, 0, 0);
      g_object_unref (G_OBJECT (tmp_buf));

      if (gmask)
        {
          GdkPixbuf *mask_buf = gdk_pixbuf_get_from_drawable (NULL,
                                                              gmask,
                                                              NULL,
                                                              0, 0, 0, 0,
                                                              width, height);
          guchar *pixels = gdk_pixbuf_get_pixels (icon_buf);
          guchar *mask_pixels = gdk_pixbuf_get_pixels (mask_buf);
          int rowstride = gdk_pixbuf_get_rowstride (icon_buf);
          int mask_rowstride = gdk_pixbuf_get_rowstride (mask_buf);
          int y;

          for (y = 0; y < height; ++y)
            {
              guchar *iconptr, *maskptr;
              int x;

              iconptr = pixels + y * rowstride;
              maskptr = mask_pixels + y * mask_rowstride;

              for (x = 0; x < width; ++x)
                {
                  /* In a bitmap, RGB is either 255/255/255 or 0/0/0.  Checking
                     just R is sufficient.  */
                  if (maskptr[0] == 0)
                    iconptr[3] = 0; /* 0, 1, 2 is R, G, B.  3 is alpha.  */

                  iconptr += rowstride/width;
                  maskptr += mask_rowstride/width;
                }
            }

          g_object_unref (G_OBJECT (mask_buf));
        }

      if (! old_widget)
        old_widget = GTK_IMAGE (gtk_image_new_from_pixbuf (icon_buf));
      else
        gtk_image_set_from_pixbuf (old_widget, icon_buf);

      g_object_unref (G_OBJECT (icon_buf));
    }

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  g_object_unref (G_OBJECT (gpix));
  if (gmask) g_object_unref (G_OBJECT (gmask));

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  return GTK_WIDGET (old_widget);
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}


/* Set CURSOR on W and all widgets W contain.  We must do like this
   for scroll bars and menu because they create widgets internally,
   and it is those widgets that are visible.  */
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static void
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xg_set_cursor (w, cursor)
     GtkWidget *w;
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     GdkCursor *cursor;
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{
  GList *children = gdk_window_peek_children (w->window);

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  gdk_window_set_cursor (w->window, cursor);
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  /* The scroll bar widget has more than one GDK window (had to look at
     the source to figure this out), and there is no way to set cursor
     on widgets in GTK.  So we must set the cursor for all GDK windows.
     Ditto for menus.  */

  for ( ; children; children = g_list_next (children))
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    gdk_window_set_cursor (GDK_WINDOW (children->data), cursor);
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}

/*  Timer function called when a timeout occurs for xg_timer.
    This function processes all GTK events in a recursive event loop.
    This is done because GTK timer events are not seen by Emacs event
    detection, Emacs only looks for X events.  When a scroll bar has the
    pointer (detected by button press/release events below) an Emacs
    timer is started, and this function can then check if the GTK timer
    has expired by calling the GTK event loop.
    Also, when a menu is active, it has a small timeout before it
    pops down the sub menu under it.  */
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static void
xg_process_timeouts (timer)
     struct atimer *timer;
{
  BLOCK_INPUT;
  /* Ideally we would like to just handle timer events, like the Xt version
     of this does in xterm.c, but there is no such feature in GTK.  */
  while (gtk_events_pending ())
    gtk_main_iteration ();
  UNBLOCK_INPUT;
}

/* Start the xg_timer with an interval of 0.1 seconds, if not already started.
   xg_process_timeouts is called when the timer expires.  The timer
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   started is continuous, i.e. runs until xg_stop_timer is called.  */
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static void
xg_start_timer ()
{
  if (! xg_timer)
    {
      EMACS_TIME interval;
      EMACS_SET_SECS_USECS (interval, 0, 100000);
      xg_timer = start_atimer (ATIMER_CONTINUOUS,
                               interval,
                               xg_process_timeouts,
                               0);
    }
}

/* Stop the xg_timer if started.  */
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static void
xg_stop_timer ()
{
  if (xg_timer)
    {
      cancel_atimer (xg_timer);
      xg_timer = 0;
    }
}

/* Insert NODE into linked LIST.  */
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static void
xg_list_insert (xg_list_node *list, xg_list_node *node)
{
  xg_list_node *list_start = list->next;
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  if (list_start) list_start->prev = node;
  node->next = list_start;
  node->prev = 0;
  list->next = node;
}

/* Remove NODE from linked LIST.  */
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static void
xg_list_remove (xg_list_node *list, xg_list_node *node)
{
  xg_list_node *list_start = list->next;
  if (node == list_start)
    {
      list->next = node->next;
      if (list->next) list->next->prev = 0;
    }
  else
    {
      node->prev->next = node->next;
      if (node->next) node->next->prev = node->prev;
    }
}

/* Allocate and return a utf8 version of STR.  If STR is already
   utf8 or NULL, just return STR.
   If not, a new string is allocated and the caller must free the result
   with g_free.  */
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static char *
get_utf8_string (str)
     char *str;
{
  char *utf8_str = str;
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  /* If not UTF-8, try current locale.  */
  if (str && !g_utf8_validate (str, -1, NULL))
    utf8_str = g_locale_to_utf8 (str, -1, 0, 0, 0);

  return utf8_str;
}



/***********************************************************************
    General functions for creating widgets, resizing, events, e.t.c.
 ***********************************************************************/

/* Make a geometry string and pass that to GTK.  It seems this is the
   only way to get geometry position right if the user explicitly
   asked for a position when starting Emacs.
   F is the frame we shall set geometry for.  */
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static void
xg_set_geometry (f)
     FRAME_PTR f;
{
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  if (f->size_hint_flags & USPosition)
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  {
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    int left = f->left_pos;
    int xneg = f->size_hint_flags & XNegative;
    int top = f->top_pos;
    int yneg = f->size_hint_flags & YNegative;
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    char geom_str[32];
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    if (xneg)
      left = -left;
    if (yneg)
      top = -top;

    sprintf (geom_str, "=%dx%d%c%d%c%d",
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             FRAME_PIXEL_WIDTH (f),
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             FRAME_TOTAL_PIXEL_HEIGHT (f),
             (xneg ? '-' : '+'), left,
             (yneg ? '-' : '+'), top);

    if (!gtk_window_parse_geometry (GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)),
                                    geom_str))
      fprintf (stderr, "Failed to parse: '%s'\n", geom_str);
  }
}

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/* Resize the outer window of frame F after chainging the height.
   This happend when the menu bar or the tool bar is added or removed.
   COLUMNS/ROWS is the size the edit area shall have after the resize.  */
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static void
xg_resize_outer_widget (f, columns, rows)
     FRAME_PTR f;
     int columns;
     int rows;
{
  gtk_window_resize (GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)),
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                     FRAME_PIXEL_WIDTH (f), FRAME_TOTAL_PIXEL_HEIGHT (f));
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  /* base_height is now changed.  */
  x_wm_set_size_hint (f, 0, 0);

  /* If we are not mapped yet, set geometry once again, as window
     height now have changed.  */
  if (! GTK_WIDGET_MAPPED (FRAME_GTK_OUTER_WIDGET (f)))
    xg_set_geometry (f);

  xg_frame_set_char_size (f, columns, rows);
  gdk_window_process_all_updates ();
}

/* Function to handle resize of our widgets.  Since Emacs has some layouts
   that does not fit well with GTK standard containers, we do most layout
   manually.
   F is the frame to resize.
   PIXELWIDTH, PIXELHEIGHT is the new size in pixels.  */
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void
xg_resize_widgets (f, pixelwidth, pixelheight)
     FRAME_PTR f;
     int pixelwidth, pixelheight;
{
  int mbheight = FRAME_MENUBAR_HEIGHT (f);
  int tbheight = FRAME_TOOLBAR_HEIGHT (f);
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  int rows = FRAME_PIXEL_HEIGHT_TO_TEXT_LINES (f, (pixelheight 
						   - mbheight - tbheight));
  int columns = FRAME_PIXEL_WIDTH_TO_TEXT_COLS (f, pixelwidth);
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  if (FRAME_GTK_WIDGET (f)
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      && (columns != FRAME_COLS (f) 
	  || rows != FRAME_LINES (f)
          || pixelwidth != FRAME_PIXEL_WIDTH (f) 
	  || pixelheight != FRAME_PIXEL_HEIGHT (f)))
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    {
      struct x_output *x = f->output_data.x;
      GtkAllocation all;

      all.y = mbheight + tbheight;
      all.x = 0;

      all.width = pixelwidth;
      all.height = pixelheight - mbheight - tbheight;

      gtk_widget_size_allocate (x->edit_widget, &all);
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      change_frame_size (f, rows, columns, 0, 1, 0);
      SET_FRAME_GARBAGED (f);
      cancel_mouse_face (f);
    }
}


/* Update our widget size to be COLS/ROWS characters for frame F.  */
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void
xg_frame_set_char_size (f, cols, rows)
     FRAME_PTR f;
     int cols;
     int rows;
{
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  int pixelheight = FRAME_TEXT_LINES_TO_PIXEL_HEIGHT (f, rows)
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    + FRAME_MENUBAR_HEIGHT (f) + FRAME_TOOLBAR_HEIGHT (f);
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  int pixelwidth;
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  /* Take into account the size of the scroll bar.  Always use the
     number of columns occupied by the scroll bar here otherwise we
     might end up with a frame width that is not a multiple of the
     frame's character width which is bad for vertically split
     windows.  */
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  f->scroll_bar_actual_width
    = FRAME_SCROLL_BAR_COLS (f) * FRAME_COLUMN_WIDTH (f);
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  compute_fringe_widths (f, 0);
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  /* FRAME_TEXT_COLS_TO_PIXEL_WIDTH uses scroll_bar_actual_width, so call it
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     after calculating that value.  */
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  pixelwidth = FRAME_TEXT_COLS_TO_PIXEL_WIDTH (f, cols);
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  /* Must resize our top level widget.  Font size may have changed,
     but not rows/cols.  */
  gtk_window_resize (GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)),
                     pixelwidth, pixelheight);
  xg_resize_widgets (f, pixelwidth, pixelheight);
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  x_wm_set_size_hint (f, 0, 0);
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  SET_FRAME_GARBAGED (f);
  cancel_mouse_face (f);
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}

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/* Convert an X Window WSESC on display DPY to its corresponding GtkWidget.
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   Must be done like this, because GtkWidget:s can have "hidden"
   X Window that aren't accessible.

   Return 0 if no widget match WDESC.  */
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GtkWidget *
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xg_win_to_widget (dpy, wdesc)
     Display *dpy;
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     Window wdesc;
{
  gpointer gdkwin;
  GtkWidget *gwdesc = 0;

  BLOCK_INPUT;
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  gdkwin = gdk_xid_table_lookup_for_display (gdk_x11_lookup_xdisplay (dpy),
                                             wdesc);
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  if (gdkwin)
    {
      GdkEvent event;
      event.any.window = gdkwin;
      gwdesc = gtk_get_event_widget (&event);
    }
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  UNBLOCK_INPUT;
  return gwdesc;
}

/* Fill in the GdkColor C so that it represents PIXEL.
   W is the widget that color will be used for.  Used to find colormap.  */
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static void
xg_pix_to_gcolor (w, pixel, c)
     GtkWidget *w;
     unsigned long pixel;
     GdkColor *c;
{
  GdkColormap *map = gtk_widget_get_colormap (w);
  gdk_colormap_query_color (map, pixel, c);
}

/* Create and set up the GTK widgets for frame F.
   Return 0 if creation failed, non-zero otherwise.  */
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int
xg_create_frame_widgets (f)
     FRAME_PTR f;
{
  GtkWidget *wtop;
  GtkWidget *wvbox;
  GtkWidget *wfixed;
  GdkColor bg;
  GtkRcStyle *style;
  int i;
  char *title = 0;
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  BLOCK_INPUT;

  wtop = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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  xg_set_screen (wtop, f);

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  wvbox = gtk_vbox_new (FALSE, 0);
  wfixed = gtk_fixed_new ();  /* Must have this to place scroll bars  */
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  if (! wtop || ! wvbox || ! wfixed)
    {
      if (wtop) gtk_widget_destroy (wtop);
      if (wvbox) gtk_widget_destroy (wvbox);
      if (wfixed) gtk_widget_destroy (wfixed);

      return 0;
    }

  /* Use same names as the Xt port does.  I.e. Emacs.pane.emacs by default */
  gtk_widget_set_name (wtop, EMACS_CLASS);
  gtk_widget_set_name (wvbox, "pane");
  gtk_widget_set_name (wfixed, SDATA (Vx_resource_name));

  /* If this frame has a title or name, set it in the title bar.  */
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  if (! NILP (f->title)) title = SDATA (ENCODE_UTF_8 (f->title));
  else if (! NILP (f->name)) title = SDATA (ENCODE_UTF_8 (f->name));
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  if (title) gtk_window_set_title (GTK_WINDOW (wtop), title);
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  FRAME_GTK_OUTER_WIDGET (f) = wtop;
  FRAME_GTK_WIDGET (f) = wfixed;
  f->output_data.x->vbox_widget = wvbox;

  gtk_fixed_set_has_window (GTK_FIXED (wfixed), TRUE);

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  gtk_widget_set_size_request (wfixed, FRAME_PIXEL_WIDTH (f),
                               FRAME_PIXEL_HEIGHT (f));
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  gtk_container_add (GTK_CONTAINER (wtop), wvbox);
  gtk_box_pack_end (GTK_BOX (wvbox), wfixed, TRUE, TRUE, 0);

  if (FRAME_EXTERNAL_TOOL_BAR (f))
    update_frame_tool_bar (f);

  /* The tool bar is created but first there are no items in it.
     This causes it to be zero height.  Later items are added, but then
     the frame is already mapped, so there is a "jumping" resize.
     This makes geometry handling difficult, for example -0-0 will end
     up in the wrong place as tool bar height has not been taken into account.
     So we cheat a bit by setting a height that is what it will have
     later on when tool bar items are added.  */
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  if (FRAME_EXTERNAL_TOOL_BAR (f) && f->n_tool_bar_items == 0)
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    FRAME_TOOLBAR_HEIGHT (f) = 34;
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  /* We don't want this widget double buffered, because we draw on it
     with regular X drawing primitives, so from a GTK/GDK point of
     view, the widget is totally blank.  When an expose comes, this
     will make the widget blank, and then Emacs redraws it.  This flickers
     a lot, so we turn off double buffering.  */
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  gtk_widget_set_double_buffered (wfixed, FALSE);
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  /* GTK documents says use gtk_window_set_resizable.  But then a user
     can't shrink the window from its starting size.  */
  gtk_window_set_policy (GTK_WINDOW (wtop), TRUE, TRUE, TRUE);
  gtk_window_set_wmclass (GTK_WINDOW (wtop),
                          SDATA (Vx_resource_name),
                          SDATA (Vx_resource_class));

  /* Add callback to do nothing on WM_DELETE_WINDOW.  The default in
     GTK is to destroy the widget.  We want Emacs to do that instead.  */
  g_signal_connect (G_OBJECT (wtop), "delete-event",
                    G_CALLBACK (gtk_true), 0);
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  /* Convert our geometry parameters into a geometry string
     and specify it.
     GTK will itself handle calculating the real position this way.  */
  xg_set_geometry (f);

  gtk_widget_add_events (wfixed,
                         GDK_POINTER_MOTION_MASK
                         | GDK_EXPOSURE_MASK
                         | GDK_BUTTON_PRESS_MASK
                         | GDK_BUTTON_RELEASE_MASK
                         | GDK_KEY_PRESS_MASK
                         | GDK_ENTER_NOTIFY_MASK
                         | GDK_LEAVE_NOTIFY_MASK
                         | GDK_FOCUS_CHANGE_MASK
                         | GDK_STRUCTURE_MASK
                         | GDK_VISIBILITY_NOTIFY_MASK);

  /* Must realize the windows so the X window gets created.  It is used
     by callers of this function.  */
  gtk_widget_realize (wfixed);
  FRAME_X_WINDOW (f) = GTK_WIDGET_TO_X_WIN (wfixed);

  /* Since GTK clears its window by filling with the background color,
     we must keep X and GTK background in sync.  */
  xg_pix_to_gcolor (wfixed, f->output_data.x->background_pixel, &bg);
  gtk_widget_modify_bg (wfixed, GTK_STATE_NORMAL, &bg);

  /* Also, do not let any background pixmap to be set, this looks very
     bad as Emacs overwrites the background pixmap with its own idea
     of background color.  */
  style = gtk_widget_get_modifier_style (wfixed);

  /* Must use g_strdup because gtk_widget_modify_style does g_free.  */
  style->bg_pixmap_name[GTK_STATE_NORMAL] = g_strdup ("<none>");
  gtk_widget_modify_style (wfixed, style);
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  /* GTK does not set any border, and they look bad with GTK.  */
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  f->border_width = 0;
  f->internal_border_width = 0;
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  UNBLOCK_INPUT;

  return 1;
}

/* Set the normal size hints for the window manager, for frame F.
   FLAGS is the flags word to use--or 0 meaning preserve the flags
   that the window now has.
   If USER_POSITION is nonzero, we set the User Position
   flag (this is useful when FLAGS is 0).  */
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void
x_wm_set_size_hint (f, flags, user_position)
     FRAME_PTR f;
     long flags;
     int user_position;
{
  if (FRAME_GTK_OUTER_WIDGET (f))
  {
    /* Must use GTK routines here, otherwise GTK resets the size hints
       to its own defaults.  */
    GdkGeometry size_hints;
    gint hint_flags = 0;
    int base_width, base_height;
    int min_rows = 0, min_cols = 0;
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    int win_gravity = f->win_gravity;
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    if (flags)
      {
        memset (&size_hints, 0, sizeof (size_hints));
        f->output_data.x->size_hints = size_hints;
        f->output_data.x->hint_flags = hint_flags;
      }
     else
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       flags = f->size_hint_flags;
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    size_hints = f->output_data.x->size_hints;
    hint_flags = f->output_data.x->hint_flags;

    hint_flags |= GDK_HINT_RESIZE_INC | GDK_HINT_MIN_SIZE;
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    size_hints.width_inc = FRAME_COLUMN_WIDTH (f);
    size_hints.height_inc = FRAME_LINE_HEIGHT (f);
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    hint_flags |= GDK_HINT_BASE_SIZE;
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    base_width = FRAME_TEXT_COLS_TO_PIXEL_WIDTH (f, 0);
    base_height = FRAME_TEXT_LINES_TO_PIXEL_HEIGHT (f, 0)
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      + FRAME_MENUBAR_HEIGHT (f) + FRAME_TOOLBAR_HEIGHT (f);

    check_frame_size (f, &min_rows, &min_cols);

    size_hints.base_width = base_width;
    size_hints.base_height = base_height;
    size_hints.min_width  = base_width + min_cols * size_hints.width_inc;
    size_hints.min_height = base_height + min_rows * size_hints.height_inc;

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    /* These currently have a one to one mapping with the X values, but I
       don't think we should rely on that.  */
    hint_flags |= GDK_HINT_WIN_GRAVITY;
    size_hints.win_gravity = 0;
    if (win_gravity == NorthWestGravity)
      size_hints.win_gravity = GDK_GRAVITY_NORTH_WEST;
    else if (win_gravity == NorthGravity)
      size_hints.win_gravity = GDK_GRAVITY_NORTH;
    else if (win_gravity == NorthEastGravity)
      size_hints.win_gravity = GDK_GRAVITY_NORTH_EAST;
    else if (win_gravity == WestGravity)
      size_hints.win_gravity = GDK_GRAVITY_WEST;
    else if (win_gravity == CenterGravity)
      size_hints.win_gravity = GDK_GRAVITY_CENTER;
    else if (win_gravity == EastGravity)
      size_hints.win_gravity = GDK_GRAVITY_EAST;
    else if (win_gravity == SouthWestGravity)
      size_hints.win_gravity = GDK_GRAVITY_SOUTH_WEST;
    else if (win_gravity == SouthGravity)
      size_hints.win_gravity = GDK_GRAVITY_SOUTH;
    else if (win_gravity == SouthEastGravity)
      size_hints.win_gravity = GDK_GRAVITY_SOUTH_EAST;
    else if (win_gravity == StaticGravity)
      size_hints.win_gravity = GDK_GRAVITY_STATIC;

    if (flags & PPosition) hint_flags |= GDK_HINT_POS;
    if (flags & USPosition) hint_flags |= GDK_HINT_USER_POS;
    if (flags & USSize) hint_flags |= GDK_HINT_USER_SIZE;

    if (user_position)
      {
        hint_flags &= ~GDK_HINT_POS;
        hint_flags |= GDK_HINT_USER_POS;
      }

    BLOCK_INPUT;

    gtk_window_set_geometry_hints (GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)),
                                   FRAME_GTK_OUTER_WIDGET (f),
                                   &size_hints,
                                   hint_flags);

    f->output_data.x->size_hints = size_hints;
    f->output_data.x->hint_flags = hint_flags;
    UNBLOCK_INPUT;
  }
}

/* Change background color of a frame.
   Since GTK uses the background colour to clear the window, we must
   keep the GTK and X colors in sync.
   F is the frame to change,
   BG is the pixel value to change to.  */
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void
xg_set_background_color (f, bg)
     FRAME_PTR f;
     unsigned long bg;
{
  if (FRAME_GTK_WIDGET (f))
    {
      GdkColor gdk_bg;

      BLOCK_INPUT;
      xg_pix_to_gcolor (FRAME_GTK_WIDGET (f), bg, &gdk_bg);
      gtk_widget_modify_bg (FRAME_GTK_WIDGET (f), GTK_STATE_NORMAL, &gdk_bg);
      UNBLOCK_INPUT;
    }
}



/***********************************************************************
                      Dialog functions
 ***********************************************************************/
/* Return the dialog title to use for a dialog of type KEY.
   This is the encoding used by lwlib.  We use the same for GTK.  */
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static char *
get_dialog_title (char key)
{
  char *title = "";
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  switch (key) {
  case 'E': case 'e':
    title = "Error";
    break;

  case 'I': case 'i':
    title = "Information";
    break;

  case 'L': case 'l':
    title = "Prompt";
    break;

  case 'P': case 'p':
    title = "Prompt";
    break;

  case 'Q': case 'q':
    title = "Question";
    break;
  }

  return title;
}

/* Callback for dialogs that get WM_DELETE_WINDOW.  We pop down
   the dialog, but return TRUE so the event does not propagate further
   in GTK.  This prevents GTK from destroying the dialog widget automatically
   and we can always destrou the widget manually, regardles of how
   it was popped down (button press or WM_DELETE_WINDOW).
   W is the dialog widget.
   EVENT is the GdkEvent that represents WM_DELETE_WINDOW (not used).
   user_data is NULL (not used).

   Returns TRUE to end propagation of event.  */
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static gboolean
dialog_delete_callback (w, event, user_data)
     GtkWidget *w;
     GdkEvent *event;
     gpointer user_data;
{
  gtk_widget_unmap (w);
  return TRUE;
}

/* Create a popup dialog window.  See also xg_create_widget below.
   WV is a widget_value describing the dialog.
   SELECT_CB is the callback to use when a button has been pressed.
   DEACTIVATE_CB is the callback to use when the dialog pops down.

   Returns the GTK dialog widget.  */
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static GtkWidget *
create_dialog (wv, select_cb, deactivate_cb)
     widget_value *wv;
     GCallback select_cb;
     GCallback deactivate_cb;
{
  char *title = get_dialog_title (wv->name[0]);
  int total_buttons = wv->name[1] - '0';
  int right_buttons = wv->name[4] - '0';
  int left_buttons;
  int button_nr = 0;
  int button_spacing = 10;
  GtkWidget *wdialog = gtk_dialog_new ();
  widget_value *item;
  GtkBox *cur_box;
  GtkWidget *wvbox;
  GtkWidget *whbox_up;
  GtkWidget *whbox_down;

  /* If the number of buttons is greater than 4, make two rows of buttons
     instead.  This looks better.  */
  int make_two_rows = total_buttons > 4;

  if (right_buttons == 0) right_buttons = total_buttons/2;
  left_buttons = total_buttons - right_buttons;

  gtk_window_set_title (GTK_WINDOW (wdialog), title);
  gtk_widget_set_name (wdialog, "emacs-dialog");

  cur_box = GTK_BOX (GTK_DIALOG (wdialog)->action_area);

  if (make_two_rows)
    {
      wvbox = gtk_vbox_new (TRUE, button_spacing);
      whbox_up = gtk_hbox_new (FALSE, 0);
      whbox_down = gtk_hbox_new (FALSE, 0);

      gtk_box_pack_start (cur_box, wvbox, FALSE, FALSE, 0);
      gtk_box_pack_start (GTK_BOX (wvbox), whbox_up, FALSE, FALSE, 0);
      gtk_box_pack_start (GTK_BOX (wvbox), whbox_down, FALSE, FALSE, 0);

      cur_box = GTK_BOX (whbox_up);
    }

  g_signal_connect (G_OBJECT (wdialog), "delete-event",
                    G_CALLBACK (dialog_delete_callback), 0);
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  if (deactivate_cb)
    {
      g_signal_connect (G_OBJECT (wdialog), "close", deactivate_cb, 0);
      g_signal_connect (G_OBJECT (wdialog), "response", deactivate_cb, 0);
    }

  for (item = wv->contents; item; item = item->next)
    {
      char *utf8_label = get_utf8_string (item->value);
      GtkWidget *w;
      GtkRequisition req;

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      if (item->name && strcmp (item->name, "message") == 0)
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        {
          /* This is the text part of the dialog.  */
          w = gtk_label_new (utf8_label);
          gtk_box_pack_start (GTK_BOX (GTK_DIALOG (wdialog)->vbox),
                              gtk_label_new (""),
                              FALSE, FALSE, 0);
          gtk_box_pack_start (GTK_BOX (GTK_DIALOG (wdialog)->vbox), w,
                              TRUE, TRUE, 0);
          gtk_misc_set_alignment (GTK_MISC (w), 0.1, 0.5);

          /* Try to make dialog look better.  Must realize first so
             the widget can calculate the size it needs.  */
          gtk_widget_realize (w);
          gtk_widget_size_request (w, &req);
          gtk_box_set_spacing (GTK_BOX (GTK_DIALOG (wdialog)->vbox),
                               req.height);
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	  if (item->value && strlen (item->value) > 0)
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            button_spacing = 2*req.width/strlen (item->value);
        }
      else
        {
          /* This is one button to add to the dialog.  */
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          w = gtk_button_new_with_label (utf8_label);
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          if (! item->enabled)
            gtk_widget_set_sensitive (w, FALSE);
          if (select_cb)
            g_signal_connect (G_OBJECT (w), "clicked",
                              select_cb, item->call_data);

          gtk_box_pack_start (cur_box, w, TRUE, TRUE, button_spacing);
          if (++button_nr == left_buttons)
            {
              if (make_two_rows)
                cur_box = GTK_BOX (whbox_down);
              else
                gtk_box_pack_start (cur_box,
                                    gtk_label_new (""),
                                    TRUE, TRUE,
                                    button_spacing);
            }
        }

     if (utf8_label && utf8_label != item->value)
       g_free (utf8_label);
    }

  return wdialog;
}


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/***********************************************************************
                      File dialog functions
 ***********************************************************************/
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/* Function that is called when the file dialog pops down.
   W is the dialog widget, RESPONSE is the response code.
   USER_DATA is what we passed in to g_signal_connect (pointer to int).  */

static void
xg_file_response_cb (w,
                     response,
                     user_data)
     GtkDialog *w;
     gint response;
     gpointer user_data;
{
  int *ptr = (int *) user_data;
  *ptr = response;
}


/*  Destroy the dialog.  This makes it pop down.  */

static Lisp_Object
pop_down_file_dialog (arg)
     Lisp_Object arg;
{
  struct Lisp_Save_Value *p = XSAVE_VALUE (arg);
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  BLOCK_INPUT;
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  gtk_widget_destroy (GTK_WIDGET (p->pointer));
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  UNBLOCK_INPUT;
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  return Qnil;
}

typedef char * (*xg_get_file_func) P_ ((GtkWidget *));
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#ifdef HAVE_GTK_FILE_CHOOSER_DIALOG_NEW
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/* Return the selected file for file chooser dialog W.
   The returned string must be free:d.  */

static char *
xg_get_file_name_from_chooser (w)
     GtkWidget *w;
{
  return gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (w));
}

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/* Read a file name from the user using a file chooser dialog.
   F is the current frame.
   PROMPT is a prompt to show to the user.  May not be NULL.
   DEFAULT_FILENAME is a default selection to be displayed.  May be NULL.
   If MUSTMATCH_P is non-zero, the returned file name must be an existing
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   file.  *FUNC is set to a function that can be used to retrieve the
   selected file name from the returned widget.
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   Returns the created widget.  */
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static GtkWidget *
xg_get_file_with_chooser (f, prompt, default_filename,
                          mustmatch_p, only_dir_p, func)
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     FRAME_PTR f;
     char *prompt;
     char *default_filename;
     int mustmatch_p, only_dir_p;
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     xg_get_file_func *func;
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{
  GtkWidget *filewin;
  GtkWindow *gwin = GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f));
  GtkFileChooserAction action = (mustmatch_p ?
                                 GTK_FILE_CHOOSER_ACTION_OPEN :
                                 GTK_FILE_CHOOSER_ACTION_SAVE);

  if (only_dir_p)
    action = GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER;

  filewin = gtk_file_chooser_dialog_new (prompt, gwin, action,
                                         GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                                         (mustmatch_p || only_dir_p ?
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                                          GTK_STOCK_OPEN : GTK_STOCK_OK),
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                                         GTK_RESPONSE_OK,
                                         NULL);
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  gtk_file_chooser_set_local_only (GTK_FILE_CHOOSER (filewin), TRUE);
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  if (default_filename)
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    {
      Lisp_Object file;
      struct gcpro gcpro1;
      GCPRO1 (file);

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      file = build_string (default_filename);

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      /* File chooser does not understand ~/... in the file name.  It must be
         an absolute name starting with /.  */
      if (default_filename[0] != '/')
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        file = Fexpand_file_name (file, Qnil);
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      default_filename = SDATA (file);
      if (Ffile_directory_p (file))
        gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (filewin),
                                             default_filename);
      else
        gtk_file_chooser_set_filename (GTK_FILE_CHOOSER (filewin),
                                       default_filename);
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      UNGCPRO;
    }
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  *func = xg_get_file_name_from_chooser;
  return filewin;
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}
#endif /* HAVE_GTK_FILE_CHOOSER_DIALOG_NEW */

#ifdef HAVE_GTK_FILE_SELECTION_NEW
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/* Return the selected file for file selector dialog W.
   The returned string must be free:d.  */
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static char *
xg_get_file_name_from_selector (w)
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     GtkWidget *w;
{
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  GtkFileSelection *filesel = GTK_FILE_SELECTION (w);
  return xstrdup ((char*) gtk_file_selection_get_filename (filesel));
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}

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/* Create a file selection dialog.
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   F is the current frame.
   PROMPT is a prompt to show to the user.  May not be NULL.
   DEFAULT_FILENAME is a default selection to be displayed.  May be NULL.
   If MUSTMATCH_P is non-zero, the returned file name must be an existing
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   file.  *FUNC is set to a function that can be used to retrieve the
   selected file name from the returned widget.
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   Returns the created widget.  */
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static GtkWidget *
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xg_get_file_with_selection (f, prompt, default_filename,
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                            mustmatch_p, only_dir_p, func)
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     FRAME_PTR f;
     char *prompt;
     char *default_filename;
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     int mustmatch_p, only_dir_p;
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     xg_get_file_func *func;
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{
  GtkWidget *filewin;
  GtkFileSelection *filesel;
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  filewin = gtk_file_selection_new (prompt);
  filesel = GTK_FILE_SELECTION (filewin);

  if (default_filename)
    gtk_file_selection_set_filename (filesel, default_filename);

  if (mustmatch_p)
    {
      /* The selection_entry part of filesel is not documented.  */
      gtk_widget_set_sensitive (filesel->selection_entry, FALSE);
      gtk_file_selection_hide_fileop_buttons (filesel);
    }

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  *func = xg_get_file_name_from_selector;
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  return filewin;
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}
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#endif /* HAVE_GTK_FILE_SELECTION_NEW */

/* Read a file name from the user using a file dialog, either the old
   file selection dialog, or the new file chooser dialog.  Which to use
   depends on what the GTK version used has, and what the value of
   gtk-use-old-file-dialog.
   F is the current frame.
   PROMPT is a prompt to show to the user.  May not be NULL.
   DEFAULT_FILENAME is a default selection to be displayed.  May be NULL.
   If MUSTMATCH_P is non-zero, the returned file name must be an existing
   file.

   Returns a file name or NULL if no file was selected.
   The returned string must be freed by the caller.  */

char *
xg_get_file_name (f, prompt, default_filename, mustmatch_p, only_dir_p)
     FRAME_PTR f;
     char *prompt;
     char *default_filename;
     int mustmatch_p, only_dir_p;
{
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  GtkWidget *w = 0;
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  int count = SPECPDL_INDEX ();
  char *fn = 0;
  int filesel_done = 0;
  xg_get_file_func func;

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#if defined (HAVE_GTK_AND_PTHREAD) && defined (__SIGRTMIN)
  /* I really don't know why this is needed, but without this the GLIBC add on
     library linuxthreads hangs when the Gnome file chooser backend creates
     threads.  */
  sigblock (sigmask (__SIGRTMIN));
#endif /* HAVE_GTK_AND_PTHREAD */

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#ifdef HAVE_GTK_FILE_BOTH
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  extern int x_use_old_gtk_file_dialog;

  if (x_use_old_gtk_file_dialog)
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    w = xg_get_file_with_selection (f, prompt, default_filename,
                                    mustmatch_p, only_dir_p, &func);
  else
    w = xg_get_file_with_chooser (f, prompt, default_filename,
                                  mustmatch_p, only_dir_p, &func);
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#else /* not HAVE_GTK_FILE_BOTH */

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#ifdef HAVE_GTK_FILE_SELECTION_NEW
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  w = xg_get_file_with_selection (f, prompt, default_filename,
                                  mustmatch_p, only_dir_p, &func);
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#endif
#ifdef HAVE_GTK_FILE_CHOOSER_DIALOG_NEW
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  w = xg_get_file_with_chooser (f, prompt, default_filename,
                                mustmatch_p, only_dir_p, &func);
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#endif

#endif /* HAVE_GTK_FILE_BOTH */
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  xg_set_screen (w, f);
  gtk_widget_set_name (w, "emacs-filedialog");
  gtk_window_set_transient_for (GTK_WINDOW (w),
                                GTK_WINDOW (FRAME_GTK_OUTER_WIDGET (f)));
  gtk_window_set_destroy_with_parent (GTK_WINDOW (w), TRUE);
  gtk_window_set_modal (GTK_WINDOW (w), TRUE);

  g_signal_connect (G_OBJECT (w),
                    "response",
                    G_CALLBACK (xg_file_response_cb),
                    &filesel_done);

  /* Don't destroy the widget if closed by the window manager close button.  */
  g_signal_connect (G_OBJECT (w), "delete-event", G_CALLBACK (gtk_true), NULL);

  gtk_widget_show (w);

  record_unwind_protect (pop_down_file_dialog, make_save_value (w, 0));
  while (! filesel_done)
    {
      x_menu_wait_for_event (0);
      gtk_main_iteration ();
    }

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#if defined (HAVE_GTK_AND_PTHREAD) && defined (__SIGRTMIN)
  sigunblock (sigmask (__SIGRTMIN));
#endif

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  if (filesel_done == GTK_RESPONSE_OK)
    fn = (*func) (w);

  unbind_to (count, Qnil);

  return fn;
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}
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/***********************************************************************
	                Menu functions.
 ***********************************************************************/

/* The name of menu items that can be used for citomization.  Since GTK
   RC files are very crude and primitive, we have to set this on all
   menu item names so a user can easily cutomize menu items.  */

#define MENU_ITEM_NAME "emacs-menuitem"


/* Linked list of all allocated struct xg_menu_cb_data.  Used for marking
   during GC.  The next member points to the items.  */
static xg_list_node xg_menu_cb_list;

/* Linked list of all allocated struct xg_menu_item_cb_data.  Used for marking
   during GC.  The next member points to the items.  */
static xg_list_node xg_menu_item_cb_list;

/* Allocate and initialize CL_DATA if NULL, otherwise increase ref_count.
   F is the frame CL_DATA will be initialized for.
   HIGHLIGHT_CB is the callback to call when entering/leaving menu items.

   The menu bar and all sub menus under the menu bar in a frame
   share the same structure, hence the reference count.
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   Returns CL_DATA if CL_DATA is not NULL,  or a pointer to a newly
   allocated xg_menu_cb_data if CL_DATA is NULL.  */
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static xg_menu_cb_data *
make_cl_data (cl_data, f, highlight_cb)
     xg_menu_cb_data *cl_data;
     FRAME_PTR f;
     GCallback highlight_cb;
{
  if (! cl_data)
    {
      cl_data = (xg_menu_cb_data*) xmalloc (sizeof (*cl_data));
      cl_data->f = f;
      cl_data->menu_bar_vector = f->menu_bar_vector;
      cl_data->menu_bar_items_used = f->menu_bar_items_used;
      cl_data->highlight_cb = highlight_cb;
      cl_data->ref_count = 0;

      xg_list_insert (&xg_menu_cb_list, &cl_data->ptrs);
    }

  cl_data->ref_count++;

  return cl_data;
}

/* Update CL_DATA with values from frame F and with HIGHLIGHT_CB.
   HIGHLIGHT_CB is the callback to call when entering/leaving menu items.

   When the menu bar is updated, menu items may have been added and/or
   removed, so menu_bar_vector and menu_bar_items_used change.  We must
   then update CL_DATA since it is used to determine which menu
   item that is invoked in the menu.
   HIGHLIGHT_CB could change, there is no check that the same
   function is given when modifying a menu bar as was given when
   creating the menu bar.  */
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static void
update_cl_data (cl_data, f, highlight_cb)
     xg_menu_cb_data *cl_data;
     FRAME_PTR f;
     GCallback highlight_cb;
{
  if (cl_data)
    {
      cl_data->f = f;
      cl_data->menu_bar_vector = f->menu_bar_vector;
      cl_data->menu_bar_items_used = f->menu_bar_items_used;
      cl_data->highlight_cb = highlight_cb;
    }
}

/* Decrease reference count for CL_DATA.
   If reference count is zero, free CL_DATA.  */
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static void
unref_cl_data (cl_data)
     xg_menu_cb_data *cl_data;
{
  if (cl_data && cl_data->ref_count > 0)
    {
      cl_data->ref_count--;
      if (cl_data->ref_count == 0)
        {
          xg_list_remove (&xg_menu_cb_list, &cl_data->ptrs);
          xfree (cl_data);
        }
    }
}

/* Function that marks all lisp data during GC.  */
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void
xg_mark_data ()
{
  xg_list_node *iter;

  for (iter = xg_menu_cb_list.next; iter; iter = iter->next)
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    mark_object (((xg_menu_cb_data *) iter)->menu_bar_vector);
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  for (iter = xg_menu_item_cb_list.next; iter; iter = iter->next)
    {
      xg_menu_item_cb_data *cb_data = (xg_menu_item_cb_data *) iter;

      if (! NILP (cb_data->help))
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        mark_object (cb_data->help);
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    }
}


/* Callback called when a menu item is destroyed.  Used to free data.
   W is the widget that is being destroyed (not used).
   CLIENT_DATA points to the xg_menu_item_cb_data associated with the W.  */
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static void
menuitem_destroy_callback (w, client_data)
     GtkWidget *w;
     gpointer client_data;
{
  if (client_data)
    {
      xg_menu_item_cb_data *data = (xg_menu_item_cb_data*) client_data;
      xg_list_remove (&xg_menu_item_cb_list, &data->ptrs);
      xfree (data);
    }
}

/* Callback called when the pointer enters/leaves a menu item.
   W is the menu item.
   EVENT is either an enter event or leave event.
   CLIENT_DATA points to the xg_menu_item_cb_data associated with the W.

   Returns FALSE to tell GTK to keep processing this event.  */
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static gboolean
menuitem_highlight_callback (w, event, client_data)
     GtkWidget *w;
     GdkEventCrossing *event;
     gpointer client_data;
{
  if (client_data)
    {
      xg_menu_item_cb_data *data = (xg_menu_item_cb_data*) client_data;
      gpointer call_data = event->type == GDK_LEAVE_NOTIFY ? 0 : client_data;
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      if (! NILP (data->help) && data->cl_data->highlight_cb)
        {
          GtkCallback func = (GtkCallback) data->cl_data->highlight_cb;
          (*func) (w, call_data);
        }
    }

  return FALSE;
}

/* Callback called when a menu is destroyed.  Used to free data.
   W is the widget that is being destroyed (not used).
   CLIENT_DATA points to the xg_menu_cb_data associated with W.  */
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