emacs/lwlib/lwlib-Xaw.c

/* The lwlib interface to Athena widgets.
Copyright (C) 1993 Chuck Thompson <cthomp@cs.uiuc.edu>
Copyright (C) 1994, 2001, 2002, 2003, 2004, 2005, 2006,
  2007, 2008, 2009, 2010 Free Software Foundation, Inc.

This file is part of the Lucid Widget Library.

The Lucid Widget Library 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 1, or (at your option)
any later version.

The Lucid Widget Library 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <setjmp.h>
#include <ctype.h>

#include "../src/lisp.h"

#include "lwlib-Xaw.h"

#include <X11/StringDefs.h>
#include <X11/IntrinsicP.h>
#include <X11/CoreP.h>
#include <X11/Shell.h>

#ifdef HAVE_XAW3D
#include <X11/Xaw3d/Scrollbar.h>
#include <X11/Xaw3d/Paned.h>
#include <X11/Xaw3d/Dialog.h>
#include <X11/Xaw3d/Form.h>
#include <X11/Xaw3d/Command.h>
#include <X11/Xaw3d/Label.h>
#else /* !HAVE_XAW3D */
#include <X11/Xaw/Scrollbar.h>
#include <X11/Xaw/Paned.h>
#include <X11/Xaw/Dialog.h>
#include <X11/Xaw/Form.h>
#include <X11/Xaw/Command.h>
#include <X11/Xaw/Label.h>
#endif /* HAVE_XAW3D */

#include <X11/Xatom.h>

#ifdef HAVE_XFT
#include <X11/Xft/Xft.h>

struct widget_xft_data
{
  Widget widget;
  XftFont *xft_font;
  XftDraw *xft_draw;
  XftColor xft_fg, xft_bg;
  int p_width, p_height;
  Pixmap p;
};


#endif

static void xaw_generic_callback (Widget widget, XtPointer closure, XtPointer call_data);


Boolean
lw_xaw_widget_p (Widget widget)
{
  return (XtIsSubclass (widget, scrollbarWidgetClass) ||
	  XtIsSubclass (widget, dialogWidgetClass));
}

#if 0
static void
xaw_update_scrollbar (instance, widget, val)
     widget_instance *instance;
     Widget widget;
     widget_value *val;
{
  if (val->scrollbar_data)
    {
      scrollbar_values *data = val->scrollbar_data;
      Dimension height, width;
      Dimension pos_x, pos_y;
      int widget_shown, widget_topOfThumb;
      float new_shown, new_topOfThumb;

      XtVaGetValues (widget,
		     XtNheight, &height,
		     XtNwidth, &width,
		     XtNx, &pos_x,
		     XtNy, &pos_y,
		     XtNtopOfThumb, &widget_topOfThumb,
		     XtNshown, &widget_shown,
		     NULL);

      /*
       * First size and position the scrollbar widget.
       * We need to position it to second-guess the Paned widget's notion
       * of what should happen when the WMShell gets resized.
       */
      if (height != data->scrollbar_height || pos_y != data->scrollbar_pos)
	{
	  XtConfigureWidget (widget, pos_x, data->scrollbar_pos,
			     width, data->scrollbar_height, 0);

	  XtVaSetValues (widget,
			 XtNlength, data->scrollbar_height,
			 XtNthickness, width,
			 NULL);
	}

      /*
       * Now the size the scrollbar's slider.
       */
      new_shown = (float) data->slider_size /
	(float) (data->maximum - data->minimum);

      new_topOfThumb = (float) (data->slider_position - data->minimum) /
	(float) (data->maximum - data->minimum);

      if (new_shown > 1.0)
	new_shown = 1.0;
      if (new_shown < 0)
	new_shown = 0;

      if (new_topOfThumb > 1.0)
	new_topOfThumb = 1.0;
      if (new_topOfThumb < 0)
	new_topOfThumb = 0;

      if (new_shown != widget_shown || new_topOfThumb != widget_topOfThumb)
	XawScrollbarSetThumb (widget, new_topOfThumb, new_shown);
    }
}
#endif

#ifdef HAVE_XFT
static void
fill_xft_data (struct widget_xft_data *data, Widget widget, XftFont *font)
{
  Pixel bg, fg;
  XColor colors[2];

  data->widget = widget;
  data->xft_font = font;
  XtVaGetValues (widget,
                 XtNbackground, &bg,
                 XtNforeground, &fg,
                 NULL);

  colors[0].pixel = data->xft_fg.pixel = fg;
  colors[1].pixel = data->xft_bg.pixel = bg;
  XQueryColors (XtDisplay (widget),
                DefaultColormapOfScreen (XtScreen (widget)),
                colors, 2);

  data->xft_fg.color.alpha = 0xFFFF;
  data->xft_fg.color.red = colors[0].red;
  data->xft_fg.color.green = colors[0].green;
  data->xft_fg.color.blue = colors[0].blue;
  data->xft_bg.color.alpha = 0xFFFF;
  data->xft_bg.color.red = colors[1].red;
  data->xft_bg.color.green = colors[1].green;
  data->xft_bg.color.blue = colors[1].blue;

  data->p = None;
  data->xft_draw = 0;
  data->p_width = data->p_height = 0;
}

static XftFont*
openFont (Widget widget, char *name)
{
  char *fname = name;
  int screen = XScreenNumberOfScreen (XtScreen (widget));
  int len = strlen (fname), i = len-1;
  XftFont *fn;

  /* Try to convert Gtk-syntax (Sans 9) to Xft syntax Sans-9.  */
  while (i > 0 && isdigit (fname[i]))
    --i;
  if (fname[i] == ' ')
    {
      fname = xstrdup (name);
      fname[i] = '-';
    }

  fn = XftFontOpenName (XtDisplay (widget), screen, fname);
  if (fname != name) free (fname);

  return fn;
}

static int
get_text_width_and_height (Widget widget, char *text,
                           XftFont *xft_font,
                           int *height)
{
  int w = 0, h = 0;
  char *bp = text;
  
  while (bp && *bp != '\0')
    {
      XGlyphInfo gi;
      char *cp = strchr (bp, '\n');
      XftTextExtentsUtf8 (XtDisplay (widget), xft_font,
                          (FcChar8 *) bp,
                          cp ? cp - bp : strlen (bp),
                          &gi);
      bp = cp ? cp + 1 : NULL;
      h += xft_font->height;
      if (w < gi.width) w = gi.width;
    }

  *height = h;
  return w;
}

static void
draw_text (struct widget_xft_data *data, char *lbl, int inverse)
{
  Screen *sc = XtScreen (data->widget);
  int screen = XScreenNumberOfScreen (sc);
  int y = data->xft_font->ascent;
  int x = inverse ? 0 : 2;
  char *bp = lbl;

  data->xft_draw = XftDrawCreate (XtDisplay (data->widget),
                                  data->p,
                                  DefaultVisual (XtDisplay (data->widget),
                                                 screen),
                                  DefaultColormapOfScreen (sc));
  XftDrawRect (data->xft_draw,
               inverse ? &data->xft_fg : &data->xft_bg,
               0, 0, data->p_width, data->p_height);

  if (!inverse) y += 2;
  while (bp && *bp != '\0')
    {
      char *cp = strchr (bp, '\n');
      XftDrawStringUtf8 (data->xft_draw,
                         inverse ? &data->xft_bg : &data->xft_fg,
                         data->xft_font, x, y,
                         (FcChar8 *) bp,
                         cp ? cp - bp : strlen (bp));
      bp = cp ? cp + 1 : NULL;
      /* 1.2 gives reasonable line spacing.  */
      y += data->xft_font->height * 1.2;
    }

}


static void
set_text (struct widget_xft_data *data, Widget toplevel, char *lbl, int margin)
{
  int width, height;

  width = get_text_width_and_height (data->widget, lbl, data->xft_font,
                                     &height);
  data->p_width = width + margin;
  data->p_height = height + margin;

  data->p = XCreatePixmap (XtDisplay (data->widget),
                           XtWindow (toplevel),
                           data->p_width,
                           data->p_height,
                           DefaultDepthOfScreen (XtScreen (data->widget)));
  draw_text (data, lbl, 0);
  XtVaSetValues (data->widget, XtNbitmap, data->p, NULL);
}

static struct widget_xft_data *
find_xft_data (Widget widget)
{
  widget_instance *inst = NULL;
  Widget parent = XtParent (widget);
  struct widget_xft_data *data = NULL;
  int nr;
  while (parent && !inst) 
    {
      inst = lw_get_widget_instance (parent);
      parent = XtParent (parent);
    }
  if (!inst || !inst->xft_data || !inst->xft_data[0].xft_font) return 0;

  for (nr = 0; data == NULL && nr < inst->nr_xft_data; ++nr) 
    {
      if (inst->xft_data[nr].widget == widget) 
        data = &inst->xft_data[nr];
    }

  return data;
}

static void
command_press (Widget widget,
               XEvent* event,
               String *params,
               Cardinal *num_params)
{
  struct widget_xft_data *data = find_xft_data (widget);
  if (data) 
    {
      char *lbl;
      /* Since this isn't used for rectangle buttons, use it to for armed.  */
      XtVaSetValues (widget, XtNcornerRoundPercent, 1, NULL);

      XtVaGetValues (widget, XtNlabel, &lbl, NULL);
      draw_text (data, lbl, 1);
    }
}

static void
command_reset (Widget widget,
                 XEvent* event,
                 String *params,
                 Cardinal *num_params)
{
  struct widget_xft_data *data = find_xft_data (widget);
  if (data) 
    {
      Dimension cr;
      XtVaGetValues (widget, XtNcornerRoundPercent, &cr, NULL);
      if (cr == 1) 
        {
          char *lbl;
          XtVaSetValues (widget, XtNcornerRoundPercent, 0, NULL);
          XtVaGetValues (widget, XtNlabel, &lbl, NULL);
          draw_text (data, lbl, 0);
        }
    }
}


#endif

void
xaw_update_one_widget (widget_instance *instance, Widget widget,
		       widget_value *val, Boolean deep_p)
{
#if 0
  if (XtIsSubclass (widget, scrollbarWidgetClass))
    {
      xaw_update_scrollbar (instance, widget, val);
    }
#endif
  if (XtIsSubclass (widget, dialogWidgetClass))
    {

#ifdef HAVE_XFT
      if (instance->xft_data && instance->xft_data[0].xft_font)
        {
          set_text (&instance->xft_data[0], instance->parent,
                    val->contents->value, 10);
        }
#endif
      XtVaSetValues (widget, XtNlabel, val->contents->value, NULL);
    }
  else if (XtIsSubclass (widget, commandWidgetClass))
    {
      Dimension bw = 0;
      Arg al[10];
      int ac = 0;

      XtVaGetValues (widget, XtNborderWidth, &bw, NULL);
      if (bw == 0)
	/* Don't let buttons end up with 0 borderwidth, that's ugly...
	   Yeah, all this should really be done through app-defaults files
	   or fallback resources, but that's a whole different can of worms
	   that I don't feel like opening right now.  Making Athena widgets
	   not look like shit is just entirely too much work.
	 */
	{
	  XtSetArg (al[0], XtNborderWidth, 1);
	  XtSetValues (widget, al, 1);
	}

      XtSetSensitive (widget, val->enabled);
      XtSetArg (al[ac], XtNlabel, val->value);ac++;
      /* Force centered button text.  Se above. */
      XtSetArg (al[ac], XtNjustify, XtJustifyCenter);ac++;
#ifdef HAVE_XFT
      if (instance->xft_data && instance->xft_data[0].xft_font)
        {
          int th;
          int nr;
          for (nr = 0; nr < instance->nr_xft_data; ++nr)
            if (instance->xft_data[nr].widget == widget)
              break;
          if (nr < instance->nr_xft_data)
            {
              set_text (&instance->xft_data[nr], instance->parent,
                        val->value, 6);

              /* Must set internalHeight to twice the highlight thickness,
                 or else it gets overwritten by our pixmap.  Probably a bug.  */
              XtVaGetValues (widget, XtNhighlightThickness, &th, NULL);
              XtSetArg (al[ac], XtNinternalHeight, 2*th);ac++;
            }
        }
#endif
      XtSetValues (widget, al, ac);
      XtRemoveAllCallbacks (widget, XtNcallback);
      XtAddCallback (widget, XtNcallback, xaw_generic_callback, instance);
    }
}

void
xaw_update_one_value (widget_instance *instance, Widget widget, widget_value *val)
{
  /* This function is not used by the scrollbars and those are the only
     Athena widget implemented at the moment so do nothing. */
  return;
}

void
xaw_destroy_instance (widget_instance *instance)
{
#ifdef HAVE_XFT
  if (instance->xft_data) 
    {
      int i;
      for (i = 0; i < instance->nr_xft_data; ++i) 
        {
          if (instance->xft_data[i].xft_draw)
            XftDrawDestroy (instance->xft_data[i].xft_draw);
          if (instance->xft_data[i].p != None) 
            {
              XtVaSetValues (instance->xft_data[i].widget, XtNbitmap, None,
                             NULL);
              XFreePixmap (XtDisplay (instance->widget),
                           instance->xft_data[i].p);
            }
        }
      if (instance->xft_data[0].xft_font)
        XftFontClose (XtDisplay (instance->widget),
                      instance->xft_data[0].xft_font);
      free (instance->xft_data);
    }
#endif
  if (XtIsSubclass (instance->widget, dialogWidgetClass))
    /* Need to destroy the Shell too. */
    XtDestroyWidget (XtParent (instance->widget));
  else
    XtDestroyWidget (instance->widget);
}

void
xaw_popup_menu (Widget widget, XEvent *event)
{
  /* An Athena menubar has not been implemented. */
  return;
}

void
xaw_pop_instance (widget_instance *instance, Boolean up)
{
  Widget widget = instance->widget;

  if (up)
    {
      if (XtIsSubclass (widget, dialogWidgetClass))
	{
	  /* For dialogs, we need to call XtPopup on the parent instead
	     of calling XtManageChild on the widget.
	     Also we need to hack the shell's WM_PROTOCOLS to get it to
	     understand what the close box is supposed to do!!
	   */
	  Display *dpy = XtDisplay (widget);
	  Widget shell = XtParent (widget);
	  Atom props [2];
	  int i = 0;
	  props [i++] = XInternAtom (dpy, "WM_DELETE_WINDOW", False);
	  XChangeProperty (dpy, XtWindow (shell),
			   XInternAtom (dpy, "WM_PROTOCOLS", False),
			   XA_ATOM, 32, PropModeAppend,
			   (unsigned char *) props, i);

	  /* Center the widget in its parent.  Why isn't this kind of crap
	     done automatically?  I thought toolkits were supposed to make
	     life easier?
	   */
	  {
	    unsigned int x, y, w, h;
	    Widget topmost = instance->parent;
	    Arg args[2];

	    w = shell->core.width;
	    h = shell->core.height;
	    while (topmost->core.parent && XtIsRealized (topmost->core.parent))
	      topmost = topmost->core.parent;
	    if (topmost->core.width < w) x = topmost->core.x;
	    else x = topmost->core.x + ((topmost->core.width - w) / 2);
	    if (topmost->core.height < h) y = topmost->core.y;
	    else y = topmost->core.y + ((topmost->core.height - h) / 2);
	    /* Using XtMoveWidget caused the widget to come
	       out in the wrong place with vtwm.
	       Question of virtual vs real coords, perhaps.  */
	    XtSetArg (args[0], XtNx, x);
	    XtSetArg (args[1], XtNy, y);
	    XtSetValues (shell, args, 2);
	  }

	  /* Finally, pop it up. */
	  XtPopup (shell, XtGrabNonexclusive);
	}
      else
	XtManageChild (widget);
    }
  else
    {
      if (XtIsSubclass (widget, dialogWidgetClass))
	XtUnmanageChild (XtParent (widget));
      else
	XtUnmanageChild (widget);
    }
}


/* Dialog boxes */

static char overrideTrans[] =
	"<Message>WM_PROTOCOLS: lwlib_delete_dialog()";
/* Dialogs pop down on any key press */
static char dialogOverride[] =
       "<KeyPress>Escape:	lwlib_delete_dialog()";
static void wm_delete_window (Widget w,
                              XEvent *event,
                              String *params,
                              Cardinal *num_params);
static XtActionsRec xaw_actions [] = {
  {"lwlib_delete_dialog", wm_delete_window}
};
static Boolean actions_initted = False;

#ifdef HAVE_XFT
static XtActionsRec button_actions[] = 
  {
    { "my_reset", command_reset },
    { "my_press", command_press },
  };
char buttonTrans[] =
  "<Leave>: reset() my_reset()\n"
  "<Btn1Down>: set() my_press()\n"
  "<Btn1Up>:  my_reset() notify() unset()\n";
#endif

static Widget
make_dialog (name, parent, pop_up_p, shell_title, icon_name, text_input_slot,
             radio_box, list, left_buttons, right_buttons, instance)
     char* name;
     Widget parent;
     Boolean pop_up_p;
     char* shell_title;
     char* icon_name;
     Boolean text_input_slot;
     Boolean radio_box;
     Boolean list;
     int left_buttons;
     int right_buttons;
     widget_instance *instance;
{
  Arg av [20];
  int ac = 0;
  int i, bc;
  char button_name [255];
  Widget shell;
  Widget dialog;
  Widget button;
  XtTranslations override;
#ifdef HAVE_XFT
  XftFont *xft_font = 0;
  XtTranslations button_override;
#endif

  if (! pop_up_p) abort (); /* not implemented */
  if (text_input_slot) abort (); /* not implemented */
  if (radio_box) abort (); /* not implemented */
  if (list) abort (); /* not implemented */

  if (! actions_initted)
    {
      XtAppContext app = XtWidgetToApplicationContext (parent);
      XtAppAddActions (app, xaw_actions,
		       sizeof (xaw_actions) / sizeof (xaw_actions[0]));
#ifdef HAVE_XFT
      XtAppAddActions (app, button_actions,
		       sizeof (button_actions) / sizeof (button_actions[0]));
#endif
      actions_initted = True;
    }

  override = XtParseTranslationTable (overrideTrans);

  ac = 0;
  XtSetArg (av[ac], XtNtitle, shell_title); ac++;
  XtSetArg (av[ac], XtNallowShellResize, True); ac++;

  /* Don't allow any geometry request from the user.  */
  XtSetArg (av[ac], XtNgeometry, 0); ac++;

  shell = XtCreatePopupShell ("dialog", transientShellWidgetClass,
			      parent, av, ac);
  XtOverrideTranslations (shell, override);

  ac = 0;
  dialog = XtCreateManagedWidget (name, dialogWidgetClass, shell, av, ac);
  override = XtParseTranslationTable (dialogOverride);
  XtOverrideTranslations (dialog, override);

#ifdef HAVE_XFT
  {
    int num;
    Widget *ch = NULL;
    Widget w = 0;
    XtVaGetValues (dialog,
                   XtNnumChildren, &num,
                   XtNchildren, &ch, NULL);
    for (i = 0; i < num; ++i) 
      {
        if (!XtIsSubclass (ch[i], commandWidgetClass)
            && XtIsSubclass (ch[i], labelWidgetClass))
          {
            w = ch[i];
            break;
          }
      }
    instance->xft_data = 0;
    instance->nr_xft_data = 0;
    if (w) 
      {
        XtResource rec[] = 
          { { "faceName", "FaceName", XtRString, sizeof(String), 0, XtRString,
              (XtPointer)"Sans-14" }};
        char *faceName;
        XtVaGetSubresources (dialog, &faceName, "Dialog", "dialog",
                             rec, 1, (String)NULL);
        if (strcmp ("none", faceName) != 0)
          xft_font = openFont (dialog, faceName);
        if (xft_font) 
          {
            instance->nr_xft_data = left_buttons + right_buttons + 1;
            instance->xft_data = calloc (instance->nr_xft_data,
                                         sizeof(*instance->xft_data));

            fill_xft_data (&instance->xft_data[0], w, xft_font);
          }
      }

    button_override = XtParseTranslationTable (buttonTrans);
  }
#endif

  bc = 0;
  button = 0;
  for (i = 0; i < left_buttons; i++)
    {
      ac = 0;
      XtSetArg (av [ac], XtNfromHoriz, button); ac++;
      XtSetArg (av [ac], XtNleft, XtChainLeft); ac++;
      XtSetArg (av [ac], XtNright, XtChainLeft); ac++;
      XtSetArg (av [ac], XtNtop, XtChainBottom); ac++;
      XtSetArg (av [ac], XtNbottom, XtChainBottom); ac++;
      XtSetArg (av [ac], XtNresizable, True); ac++;
#ifdef HAVE_XAW3D
      if (DefaultDepthOfScreen (XtScreen (dialog)) >= 16)
        {
          /* Turn of dithered shadow if we can.  Looks bad */
          XtSetArg (av [ac], "beNiceToColormap", False); ac++;
        }
#endif
      sprintf (button_name, "button%d", ++bc);
      button = XtCreateManagedWidget (button_name, commandWidgetClass,
				      dialog, av, ac);
#ifdef HAVE_XFT
      if (xft_font)
        {
          fill_xft_data (&instance->xft_data[bc], button, xft_font);
          XtOverrideTranslations (button, button_override);
        }
#endif
    }

  for (i = 0; i < right_buttons; i++)
    {
      ac = 0;
      XtSetArg (av [ac], XtNfromHoriz, button); ac++;
      if (i == 0) 
        {
          /* Separator to the other buttons. */
          XtSetArg (av [ac], XtNhorizDistance, 30); ac++;
        }
      XtSetArg (av [ac], XtNleft, XtChainRight); ac++;
      XtSetArg (av [ac], XtNright, XtChainRight); ac++;
      XtSetArg (av [ac], XtNtop, XtChainBottom); ac++;
      XtSetArg (av [ac], XtNbottom, XtChainBottom); ac++;
      XtSetArg (av [ac], XtNresizable, True); ac++;
#ifdef HAVE_XAW3D
      if (DefaultDepthOfScreen (XtScreen (dialog)) >= 16)
        {
          /* Turn of dithered shadow if we can.  Looks bad */
          XtSetArg (av [ac], "beNiceToColormap", False); ac++;
        }
#endif
      sprintf (button_name, "button%d", ++bc);
      button = XtCreateManagedWidget (button_name, commandWidgetClass,
				      dialog, av, ac);
#ifdef HAVE_XFT
      if (xft_font)
        {
          fill_xft_data (&instance->xft_data[bc], button, xft_font);
          XtOverrideTranslations (button, button_override);
        }
#endif
    }

  return dialog;
}

Widget
xaw_create_dialog (widget_instance *instance)
{
  char *name = instance->info->type;
  Widget parent = instance->parent;
  Widget widget;
  Boolean pop_up_p = instance->pop_up_p;
  char *shell_name = 0;
  char *icon_name = 0;
  Boolean text_input_slot = False;
  Boolean radio_box = False;
  Boolean list = False;
  int total_buttons;
  int left_buttons = 0;
  int right_buttons = 1;

  switch (name [0]) {
  case 'E': case 'e':
    icon_name = "dbox-error";
    shell_name = "Error";
    break;

  case 'I': case 'i':
    icon_name = "dbox-info";
    shell_name = "Information";
    break;

  case 'L': case 'l':
    list = True;
    icon_name = "dbox-question";
    shell_name = "Prompt";
    break;

  case 'P': case 'p':
    text_input_slot = True;
    icon_name = "dbox-question";
    shell_name = "Prompt";
    break;

  case 'Q': case 'q':
    icon_name = "dbox-question";
    shell_name = "Question";
    break;
  }

  total_buttons = name [1] - '0';

  if (name [3] == 'T' || name [3] == 't')
    {
      text_input_slot = False;
      radio_box = True;
    }
  else if (name [3])
    right_buttons = name [4] - '0';

  left_buttons = total_buttons - right_buttons;

  widget = make_dialog (name, parent, pop_up_p,
			shell_name, icon_name, text_input_slot, radio_box,
			list, left_buttons, right_buttons, instance);
  return widget;
}


static void
xaw_generic_callback (Widget widget, XtPointer closure, XtPointer call_data)
{
  widget_instance *instance = (widget_instance *) closure;
  Widget instance_widget;
  LWLIB_ID id;
  XtPointer user_data;

  lw_internal_update_other_instances (widget, closure, call_data);

  if (! instance)
    return;
  if (widget->core.being_destroyed)
    return;

  instance_widget = instance->widget;
  if (!instance_widget)
    return;

  id = instance->info->id;

#if 0
  user_data = NULL;
  XtVaGetValues (widget, XtNuserData, &user_data, NULL);
#else
  /* Damn!  Athena doesn't give us a way to hang our own data on the
     buttons, so we have to go find it...  I guess this assumes that
     all instances of a button have the same call data. */
  {
    widget_value *val = instance->info->val->contents;
    char *name = XtName (widget);
    while (val)
      {
	if (val->name && !strcmp (val->name, name))
	  break;
	val = val->next;
      }
    if (! val) abort ();
    user_data = val->call_data;
  }
#endif

  if (instance->info->selection_cb)
    instance->info->selection_cb (widget, id, user_data);
}

static void
wm_delete_window (Widget w,
                  XEvent *event,
                  String *params,
                  Cardinal *num_params)
{
  LWLIB_ID id;
  Cardinal nkids;
  int i;
  Widget *kids = 0;
  Widget widget = 0, shell;

  if (XtIsSubclass (w, dialogWidgetClass))
    shell = XtParent (w);
  else
    shell = w;

  if (! XtIsSubclass (shell, shellWidgetClass))
    abort ();
  XtVaGetValues (shell, XtNnumChildren, &nkids, NULL);
  XtVaGetValues (shell, XtNchildren, &kids, NULL);
  if (!kids || !*kids)
    abort ();
  for (i = 0; i < nkids; i++)
    {
      widget = kids[i];
      if (XtIsSubclass (widget, dialogWidgetClass))
	break;
    }
  if (! widget) return;

  id = lw_get_widget_id (widget);
  if (! id) abort ();

  {
    widget_info *info = lw_get_widget_info (id);
    if (! info) abort ();
    if (info->selection_cb)
      info->selection_cb (widget, id, (XtPointer) -1);
  }

  lw_destroy_all_widgets (id);
}


/* Scrollbars */

#if 0
static void
xaw_scrollbar_scroll (widget, closure, call_data)
     Widget widget;
     XtPointer closure;
     XtPointer call_data;
{
  widget_instance *instance = (widget_instance *) closure;
  LWLIB_ID id;
  scroll_event event_data;

  if (!instance || widget->core.being_destroyed)
    return;

  id = instance->info->id;
  event_data.slider_value = 0;
  event_data.time = 0;

  if ((int) call_data > 0)
    event_data.action = SCROLLBAR_PAGE_DOWN;
  else
    event_data.action = SCROLLBAR_PAGE_UP;

  if (instance->info->pre_activate_cb)
    instance->info->pre_activate_cb (widget, id, (XtPointer) &event_data);
}
#endif

#if 0
static void
xaw_scrollbar_jump (widget, closure, call_data)
     Widget widget;
     XtPointer closure;
     XtPointer call_data;
{
  widget_instance *instance = (widget_instance *) closure;
  LWLIB_ID id;
  scroll_event event_data;
  scrollbar_values *val =
    (scrollbar_values *) instance->info->val->scrollbar_data;
  float percent;

  if (!instance || widget->core.being_destroyed)
    return;

  id = instance->info->id;

  percent = * (float *) call_data;
  event_data.slider_value =
    (int) (percent * (float) (val->maximum - val->minimum)) + val->minimum;

  event_data.time = 0;
  event_data.action = SCROLLBAR_DRAG;

  if (instance->info->pre_activate_cb)
    instance->info->pre_activate_cb (widget, id, (XtPointer) &event_data);
}
#endif

static Widget
xaw_create_scrollbar (widget_instance *instance)
{
#if 0
  Arg av[20];
  int ac = 0;
  Dimension width;
  Widget scrollbar;

  XtVaGetValues (instance->parent, XtNwidth, &width, NULL);

  XtSetArg (av[ac], XtNshowGrip, 0); ac++;
  XtSetArg (av[ac], XtNresizeToPreferred, 1); ac++;
  XtSetArg (av[ac], XtNallowResize, True); ac++;
  XtSetArg (av[ac], XtNskipAdjust, True); ac++;
  XtSetArg (av[ac], XtNwidth, width); ac++;
  XtSetArg (av[ac], XtNmappedWhenManaged, True); ac++;

  scrollbar =
    XtCreateWidget (instance->info->name, scrollbarWidgetClass,
		    instance->parent, av, ac);

  /* We have to force the border width to be 0 otherwise the
     geometry manager likes to start looping for awhile... */
  XtVaSetValues (scrollbar, XtNborderWidth, 0, NULL);

  XtRemoveAllCallbacks (scrollbar, "jumpProc");
  XtRemoveAllCallbacks (scrollbar, "scrollProc");

  XtAddCallback (scrollbar, "jumpProc", xaw_scrollbar_jump,
		 (XtPointer) instance);
  XtAddCallback (scrollbar, "scrollProc", xaw_scrollbar_scroll,
		 (XtPointer) instance);

  return scrollbar;
#else
  return NULL;
#endif
}

static Widget
xaw_create_main (widget_instance *instance)
{
  Arg al[1];
  int ac;

  /* Create a vertical Paned to hold menubar */
  ac = 0;
  XtSetArg (al[ac], XtNborderWidth, 0); ac++;
  return XtCreateWidget (instance->info->name, panedWidgetClass,
			 instance->parent, al, ac);
}

widget_creation_entry
xaw_creation_table [] =
{
  {"scrollbar",			xaw_create_scrollbar},
  {"main",			xaw_create_main},
  {NULL, NULL}
};

/* arch-tag: fbbd3589-ae1c-41a0-9142-f628cfee6564
   (do not change this comment) */