lwlib-Xm.c 55.5 KB
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/* The lwlib interface to Motif widgets.
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Copyright (C) 1994-1997, 1999-2020 Free Software Foundation, Inc.
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Copyright (C) 1992 Lucid, Inc.
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This file is part of the Lucid Widget Library.

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The Lucid Widget Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.

The Lucid Widget Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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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
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along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
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#include <config.h>

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#include <unistd.h>
#include <stdio.h>
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#include <setjmp.h>
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#include <X11/StringDefs.h>
#include <X11/IntrinsicP.h>
#include <X11/ObjectP.h>
#include <X11/CoreP.h>
#include <X11/CompositeP.h>

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#include <lisp.h>
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#include "lwlib-Xm.h"
#include "lwlib-utils.h"

#include <Xm/BulletinB.h>
#include <Xm/CascadeB.h>
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#include <Xm/CascadeBG.h>
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#include <Xm/DrawingA.h>
#include <Xm/FileSB.h>
#include <Xm/Label.h>
#include <Xm/List.h>
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#include <Xm/MainW.h>
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#include <Xm/MenuShell.h>
#include <Xm/MessageB.h>
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#include <Xm/PanedW.h>
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#include <Xm/PushB.h>
#include <Xm/PushBG.h>
#include <Xm/ArrowB.h>
#include <Xm/SelectioB.h>
#include <Xm/Text.h>
#include <Xm/TextF.h>
#include <Xm/ToggleB.h>
#include <Xm/ToggleBG.h>
#include <Xm/RowColumn.h>
#include <Xm/ScrolledW.h>
#include <Xm/Separator.h>
#include <Xm/DialogS.h>
#include <Xm/Form.h>

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enum do_call_type { pre_activate, selection, no_selection, post_activate };
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/* Structures to keep destroyed instances */
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typedef struct _destroyed_instance
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{
  char*		name;
  char*		type;
  Widget 	widget;
  Widget	parent;
  Boolean	pop_up_p;
  struct _destroyed_instance*	next;
} destroyed_instance;

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static destroyed_instance *make_destroyed_instance (char *, char *,
                                                    Widget, Widget,
                                                    Boolean);
static void free_destroyed_instance (destroyed_instance*);
Widget first_child (Widget);
static XmString resource_motif_string (Widget, char *);
static void destroy_all_children (Widget, int);
static void xm_update_label (widget_instance *, Widget, widget_value *);
static void xm_update_list (widget_instance *, Widget, widget_value *);
static void xm_update_pushbutton (widget_instance *, Widget,
                                  widget_value *);
static void xm_update_cascadebutton (widget_instance *, Widget,
                                     widget_value *);
static void xm_update_toggle (widget_instance *, Widget, widget_value *);
static void xm_update_radiobox (widget_instance *, Widget, widget_value *);
static void make_menu_in_widget (widget_instance *, Widget,
                                 widget_value *, int);
static void update_one_menu_entry (widget_instance *, Widget,
                                   widget_value *, Boolean);
static void xm_update_menu (widget_instance *, Widget, widget_value *,
                            Boolean);
static void xm_update_text (widget_instance *, Widget, widget_value *);
static void xm_update_text_field (widget_instance *, Widget,
                                  widget_value *);
static void activate_button (Widget, XtPointer, XtPointer);
static Widget make_dialog (char *, Widget, Boolean, char *, char *,
                           Boolean, Boolean, Boolean, int, int);
static destroyed_instance* find_matching_instance (widget_instance*);
static void mark_dead_instance_destroyed (Widget, XtPointer, XtPointer);
static void recenter_widget (Widget);
static Widget recycle_instance (destroyed_instance*);
static Widget make_menubar (widget_instance*);
static void remove_grabs (Widget, XtPointer, XtPointer);
static Widget make_popup_menu (widget_instance*);
static Widget make_main (widget_instance*);
static void set_min_dialog_size (Widget);
static void do_call (Widget, XtPointer, enum do_call_type);
static void xm_generic_callback (Widget, XtPointer, XtPointer);
static void xm_nosel_callback (Widget, XtPointer, XtPointer);
static void xm_pull_down_callback (Widget, XtPointer, XtPointer);
static void xm_pop_down_callback (Widget, XtPointer, XtPointer);
static void xm_internal_update_other_instances (Widget, XtPointer,
                                                XtPointer);
static void xm_arm_callback (Widget, XtPointer, XtPointer);
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#if 0
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void xm_update_one_widget (widget_instance *, Widget, widget_value *,
                           Boolean);
void xm_pop_instance (widget_instance*, Boolean);
void xm_manage_resizing (Widget, Boolean);
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#endif


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#if 0

/* Print the complete X resource name of widget WIDGET to stderr.
   This is sometimes handy to have available.  */

void
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x_print_complete_resource_name (Widget widget)
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{
  int i;
  String names[100];

  for (i = 0; i < 100 && widget != NULL; ++i)
    {
      names[i] = XtName (widget);
      widget = XtParent (widget);
    }

  for (--i; i >= 1; --i)
    fprintf (stderr, "%s.", names[i]);
  fprintf (stderr, "%s\n", names[0]);
}

#endif /* 0 */


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static destroyed_instance *all_destroyed_instances = NULL;
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static destroyed_instance*
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make_destroyed_instance (char* name,
                         char* type,
                         Widget widget,
                         Widget parent,
                         Boolean pop_up_p)
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{
  destroyed_instance* instance =
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    (destroyed_instance*) xmalloc (sizeof (destroyed_instance));
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  instance->name = xstrdup (name);
  instance->type = xstrdup (type);
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  instance->widget = widget;
  instance->parent = parent;
  instance->pop_up_p = pop_up_p;
  instance->next = NULL;
  return instance;
}
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static void
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free_destroyed_instance (destroyed_instance* instance)
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{
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  xfree (instance->name);
  xfree (instance->type);
  xfree (instance);
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}

/* motif utility functions */
Widget
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first_child (Widget widget)
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{
  return ((CompositeWidget)widget)->composite.children [0];
}

Boolean
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lw_motif_widget_p (Widget widget)
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{
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  return
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    XtClass (widget) == xmDialogShellWidgetClass
      || XmIsPrimitive (widget) || XmIsManager (widget) || XmIsGadget (widget);
}

static XmString
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resource_motif_string (Widget widget,
                       char* name)
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{
  XtResource resource;
  XmString result = 0;
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  resource.resource_name = name;
  resource.resource_class = XmCXmString;
  resource.resource_type = XmRXmString;
  resource.resource_size = sizeof (XmString);
  resource.resource_offset = 0;
  resource.default_type = XtRImmediate;
  resource.default_addr = 0;

  XtGetSubresources (widget, (XtPointer)&result, "dialogString",
		     "DialogString", &resource, 1, NULL, 0);
  return result;
}

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/* Destroy all of the children of WIDGET
   starting with number FIRST_CHILD_TO_DESTROY.  */

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static void
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destroy_all_children (Widget widget,
                      int first_child_to_destroy)
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{
  Widget* children;
  unsigned int number;
  int i;

  children = XtCompositeChildren (widget, &number);
  if (children)
    {
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      XtUnmanageChildren (children + first_child_to_destroy,
			  number - first_child_to_destroy);

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      /* Unmanage all children and destroy them.  They will only be
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	 really destroyed when we get out of DispatchEvent.  */
      for (i = first_child_to_destroy; i < number; i++)
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	{
	  Arg al[2];
	  Widget submenu = 0;
	  /* Cascade buttons have submenus,and these submenus
	     need to be freed.  But they are not included in
	     XtCompositeChildren.  So get it out of the cascade button
	     and free it.  If this child is not a cascade button,
	     then submenu should remain unchanged.  */
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	  XtSetArg (al[0], XmNsubMenuId, &submenu);
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  	  XtGetValues (children[i], al, 1);
	  if (submenu)
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            {
              destroy_all_children (submenu, 0);
              XtDestroyWidget (submenu);
            }
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	  XtDestroyWidget (children[i]);
	}
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      XtFree ((char *) children);
    }
}

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/* Callback XmNarmCallback and XmNdisarmCallback for buttons in a
   menu.  CLIENT_DATA contains a pointer to the widget_value
   corresponding to widget W.  CALL_DATA contains a
   XmPushButtonCallbackStruct containing the reason why the callback
   is called.  */

static void
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xm_arm_callback (Widget w, XtPointer client_data, XtPointer call_data)
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{
  XmPushButtonCallbackStruct *cbs = (XmPushButtonCallbackStruct *) call_data;
  widget_value *wv = (widget_value *) client_data;
  widget_instance *instance;

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  /* Get the id of the menu bar or popup menu this widget is in.  */
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  while (w != NULL)
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    {
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      if (XmIsRowColumn (w))
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	{
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	  unsigned char type = 0xff;
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	  XtVaGetValues (w, XmNrowColumnType, &type, NULL);
	  if (type == XmMENU_BAR || type == XmMENU_POPUP)
	    break;
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	}
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      w = XtParent (w);
    }

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  if (w != NULL)
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    {
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      instance = lw_get_widget_instance (w);
      if (instance && instance->info->highlight_cb)
	{
	  call_data = cbs->reason == XmCR_DISARM ? NULL : wv;
	  instance->info->highlight_cb (w, instance->info->id, call_data);
	}
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    }
}


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/* Update the label of widget WIDGET.  WIDGET must be a Label widget
   or a subclass of Label.  WIDGET_INSTANCE is unused.  VAL contains
   the value to update.

   Menus:
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   Emacs fills VAL->name with the text to display in the menu, and
   sets VAL->value to null.  Function make_menu_in_widget creates
   widgets with VAL->name as resource name.  This works because the
   Label widget uses its resource name for display if no
   XmNlabelString is set.

   Dialogs:

   VAL->name is again set to the resource name, but VAL->value is
   not null, and contains the label string to display.  */

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static void
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xm_update_label (widget_instance* instance,
                 Widget widget,
                 widget_value* val)
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{
  XmString res_string = 0;
  XmString built_string = 0;
  XmString key_string = 0;
  Arg al [256];
  int ac;
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  ac = 0;

  if (val->value)
    {
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      /* A label string is specified, i.e. we are in a dialog.  First
	 see if it is overridden by something from the resource file.  */
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      res_string = resource_motif_string (widget, val->value);

      if (res_string)
	{
	  XtSetArg (al [ac], XmNlabelString, res_string); ac++;
	}
      else
	{
	  built_string =
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	    XmStringCreateLocalized (val->value);
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	  XtSetArg (al [ac], XmNlabelString, built_string); ac++;
	}
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      XtSetArg (al [ac], XmNlabelType, XmSTRING); ac++;
    }
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  if (val->key)
    {
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      key_string = XmStringCreateLocalized (val->key);
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      XtSetArg (al [ac], XmNacceleratorText, key_string); ac++;
    }

  if (ac)
    XtSetValues (widget, al, ac);

  if (built_string)
    XmStringFree (built_string);

  if (key_string)
    XmStringFree (key_string);
}

/* update of list */
static void
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xm_update_list (widget_instance* instance,
                Widget widget,
                widget_value* val)
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{
  widget_value* cur;
  int i;
  XtRemoveAllCallbacks (widget, XmNsingleSelectionCallback);
  XtAddCallback (widget, XmNsingleSelectionCallback, xm_generic_callback,
		 instance);
  for (cur = val->contents, i = 0; cur; cur = cur->next)
    if (cur->value)
      {
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	XmString xmstr = XmStringCreateLocalized (cur->value);
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	i += 1;
	XmListAddItem (widget, xmstr, 0);
	if (cur->selected)
	  XmListSelectPos (widget, i, False);
	XmStringFree (xmstr);
      }
}

/* update of buttons */
static void
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xm_update_pushbutton (widget_instance* instance,
                      Widget widget,
                      widget_value* val)
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{
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  XtVaSetValues (widget, XmNalignment, XmALIGNMENT_CENTER, NULL);
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  XtRemoveAllCallbacks (widget, XmNactivateCallback);
  XtAddCallback (widget, XmNactivateCallback, xm_generic_callback, instance);
}

static void
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xm_update_cascadebutton (widget_instance* instance,
                         Widget widget,
                         widget_value* val)
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{
  /* Should also rebuild the menu by calling ...update_menu... */
  XtRemoveAllCallbacks (widget, XmNcascadingCallback);
  XtAddCallback (widget, XmNcascadingCallback, xm_pull_down_callback,
		 instance);
}

/* update toggle and radiobox */
static void
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xm_update_toggle (widget_instance* instance,
                  Widget widget,
                  widget_value* val)
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{
  XtRemoveAllCallbacks (widget, XmNvalueChangedCallback);
  XtAddCallback (widget, XmNvalueChangedCallback,
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		 xm_generic_callback, instance);
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  XtVaSetValues (widget, XmNset, val->selected,
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		 XmNalignment, XmALIGNMENT_BEGINNING, NULL);
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}

static void
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xm_update_radiobox (widget_instance* instance,
                    Widget widget,
                    widget_value* val)
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{
  Widget toggle;
  widget_value* cur;

  /* update the callback */
  XtRemoveAllCallbacks (widget, XmNentryCallback);
  XtAddCallback (widget, XmNentryCallback, xm_generic_callback, instance);

  /* first update all the toggles */
  /* Energize kernel interface is currently bad.  It sets the selected widget
     with the selected flag but returns it by its name.  So we currently
     have to support both setting the selection with the selected slot
     of val contents and setting it with the "value" slot of val.  The latter
     has a higher priority.  This to be removed when the kernel is fixed. */
  for (cur = val->contents; cur; cur = cur->next)
    {
      toggle = XtNameToWidget (widget, cur->value);
      if (toggle)
	{
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	  XtSetSensitive (toggle, cur->enabled);
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	  if (!val->value && cur->selected)
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	    XtVaSetValues (toggle, XmNset, cur->selected, NULL);
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	  if (val->value && strcmp (val->value, cur->value))
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	    XtVaSetValues (toggle, XmNset, False, NULL);
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	}
    }

  /* The selected was specified by the value slot */
  if (val->value)
    {
      toggle = XtNameToWidget (widget, val->value);
      if (toggle)
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	XtVaSetValues (toggle, XmNset, True, NULL);
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    }
}

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/* update a popup menu, pulldown menu or a menubar */
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/* KEEP_FIRST_CHILDREN gives the number of initial children to keep.  */

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static void
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make_menu_in_widget (widget_instance* instance,
                     Widget widget,
                     widget_value* val,
                     int keep_first_children)
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{
  Widget* children = 0;
  int num_children;
  int child_index;
  widget_value* cur;
  Widget button = 0;
  Widget menu;
  Arg al [256];
  int ac;
  Boolean menubar_p;
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  unsigned char type;
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  Widget* old_children;
  unsigned int old_num_children;

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  /* Disable drag and drop for labels in menu bar.  */
  static char overrideTrans[] = "<Btn2Down>: Noop()";
  XtTranslations override = XtParseTranslationTable (overrideTrans);

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  old_children = XtCompositeChildren (widget, &old_num_children);

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  /* Allocate the children array */
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  for (num_children = 0, cur = val; cur; num_children++, cur = cur->next)
    ;
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  children = (Widget*)(void*)XtMalloc (num_children * sizeof (Widget));
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  /* WIDGET should be a RowColumn.  */
  if (!XmIsRowColumn (widget))
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    emacs_abort ();
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  /* Determine whether WIDGET is a menu bar.  */
  type = -1;
  XtSetArg (al[0], XmNrowColumnType, &type);
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  XtGetValues (widget, al, 1);
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  if (type != XmMENU_BAR && type != XmMENU_PULLDOWN && type != XmMENU_POPUP)
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    emacs_abort ();
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  menubar_p = type == XmMENU_BAR;
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  /* Add a callback to popups and pulldowns that is called when
     it is made invisible again.  */
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  if (!menubar_p)
    XtAddCallback (XtParent (widget), XmNpopdownCallback,
		   xm_pop_down_callback, (XtPointer)instance);

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  /* Preserve the first KEEP_FIRST_CHILDREN old children.  */
  for (child_index = 0, cur = val; child_index < keep_first_children;
       child_index++, cur = cur->next)
    children[child_index] = old_children[child_index];

  /* Check that those are all we have
     (the caller should have deleted the rest).  */
  if (old_num_children != keep_first_children)
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    emacs_abort ();
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  /* Create the rest.  */
  for (child_index = keep_first_children; cur; child_index++, cur = cur->next)
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    {
      enum menu_separator separator;

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      ac = 0;
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      XtSetArg (al[ac], XmNsensitive, cur->enabled); ac++;
      XtSetArg (al[ac], XmNalignment, XmALIGNMENT_BEGINNING); ac++;
      XtSetArg (al[ac], XmNuserData, cur->call_data); ac++;
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      if (instance->pop_up_p && !cur->contents && !cur->call_data
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	  && !lw_separator_p (cur->name, &separator, 1))
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	{
	  ac = 0;
	  XtSetArg (al[ac], XmNalignment, XmALIGNMENT_CENTER); ac++;
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	  button = XmCreateLabel (widget, cur->name, al, ac);
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	}
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      else if (lw_separator_p (cur->name, &separator, 1))
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	{
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	  ac = 0;
	  XtSetArg (al[ac], XmNseparatorType, separator); ++ac;
	  button = XmCreateSeparator (widget, cur->name, al, ac);
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	}
      else if (!cur->contents)
	{
	  if (menubar_p)
	    button = XmCreateCascadeButton (widget, cur->name, al, ac);
	  else if (!cur->call_data)
	    button = XmCreateLabel (widget, cur->name, al, ac);
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	  else if (cur->button_type == BUTTON_TYPE_TOGGLE
		   || cur->button_type == BUTTON_TYPE_RADIO)
	    {
	      XtSetArg (al[ac], XmNset, cur->selected); ++ac;
	      XtSetArg (al[ac], XmNvisibleWhenOff, True); ++ac;
	      XtSetArg (al[ac], XmNindicatorType,
			(cur->button_type == BUTTON_TYPE_TOGGLE
			 ? XmN_OF_MANY : XmONE_OF_MANY));
	      ++ac;
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	      button = XmCreateToggleButton (widget, cur->name, al, ac);
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	      XtAddCallback (button, XmNarmCallback, xm_arm_callback, cur);
	      XtAddCallback (button, XmNdisarmCallback, xm_arm_callback, cur);
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	    }
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	  else
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	    {
	      button = XmCreatePushButton (widget, cur->name, al, ac);
	      XtAddCallback (button, XmNarmCallback, xm_arm_callback, cur);
	      XtAddCallback (button, XmNdisarmCallback, xm_arm_callback, cur);
	    }
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	  xm_update_label (instance, button, cur);
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	  /* Add a callback that is called when the button is
	     selected.  Toggle buttons don't support
	     XmNactivateCallback, we use XmNvalueChangedCallback in
	     that case.  Don't add a callback to a simple label.  */
	  if (cur->button_type)
	    xm_update_toggle (instance, button, cur);
	  else if (cur->call_data)
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	    XtAddCallback (button, XmNactivateCallback, xm_generic_callback,
			   (XtPointer)instance);
	}
      else
	{
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	  menu = XmCreatePulldownMenu (widget, cur->name, NULL, 0);
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	  make_menu_in_widget (instance, menu, cur->contents, 0);
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          XtSetArg (al[ac], XmNsubMenuId, menu); ac++;
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	  button = XmCreateCascadeButton (widget, cur->name, al, ac);
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	  xm_update_label (instance, button, cur);

	  XtAddCallback (button, XmNcascadingCallback, xm_pull_down_callback,
			 (XtPointer)instance);
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          XtOverrideTranslations (button, override);

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	}

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      children[child_index] = button;
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    }

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  /* Last entry is the help button.  The original comment read "Has to
     be done after managing the buttons otherwise the menubar is only
     4 pixels high."  This is no longer true, and to make
     XmNmenuHelpWidget work, we need to set it before managing the
     children.. --gerd.  */
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  if (button)
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    XtVaSetValues (widget, XmNmenuHelpWidget, button, NULL);
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  if (num_children)
    XtManageChildren (children, num_children);
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  XtFree ((char *) children);
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  if (old_children)
    XtFree ((char *) old_children);
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}

static void
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update_one_menu_entry (widget_instance* instance,
                       Widget widget,
                       widget_value* val,
                       Boolean deep_p)
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{
  Arg al [256];
  int ac;
  Widget menu;
  widget_value* contents;

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  if (val->this_one_change == NO_CHANGE)
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    return;

  /* update the sensitivity and userdata */
  /* Common to all widget types */
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  XtSetSensitive (widget, val->enabled);
  XtVaSetValues (widget, XmNuserData, val->call_data, NULL);
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  /* update the menu button as a label. */
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  if (val->this_one_change >= VISIBLE_CHANGE)
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    {
      xm_update_label (instance, widget, val);
      if (val->button_type)
	xm_update_toggle (instance, widget, val);
    }
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  /* update the pulldown/pullaside as needed */
  ac = 0;
  menu = NULL;
  XtSetArg (al [ac], XmNsubMenuId, &menu); ac++;
  XtGetValues (widget, al, ac);
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  contents = val->contents;

  if (!menu)
    {
      if (contents)
	{
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	  unsigned int old_num_children, i;
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	  Widget parent;
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	  Widget *widget_list;

	  parent = XtParent (widget);
	  widget_list = XtCompositeChildren (parent, &old_num_children);

	  /* Find the widget position within the parent's widget list.  */
	  for (i = 0; i < old_num_children; i++)
	    if (strcmp (XtName (widget_list[i]), XtName (widget)) == 0)
	      break;
	  if (i == old_num_children)
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	    emacs_abort ();
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	  if (XmIsCascadeButton (widget_list[i]))
	    {
	      menu = XmCreatePulldownMenu (parent, XtName(widget), NULL, 0);
	      make_menu_in_widget (instance, menu, contents, 0);
	      ac = 0;
	      XtSetArg (al [ac], XmNsubMenuId, menu); ac++;
	      XtSetValues (widget, al, ac);
	    }
	  else
	    {
	      Widget button;
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	      /* The current menuitem is a XmPushButtonGadget, it
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		 needs to be replaced by a CascadeButtonGadget */
	      XtDestroyWidget (widget_list[i]);
	      menu = XmCreatePulldownMenu (parent, val->name, NULL, 0);
	      make_menu_in_widget (instance, menu, contents, 0);
	      ac = 0;
	      XtSetArg (al [ac], XmNsubMenuId, menu); ac++;
	      /* Non-zero values don't work reliably in
		 conjunction with Emacs' event loop */
	      XtSetArg (al [ac], XmNmappingDelay, 0); ac++;
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#ifdef XmNpositionIndex /* This is undefined on SCO ODT 2.0.  */
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	      /* Tell Motif to put it in the right place */
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	      XtSetArg (al [ac], XmNpositionIndex , i); ac++;
#endif
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	      button = XmCreateCascadeButton (parent, val->name, al, ac);
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	      xm_update_label (instance, button, val);
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	      XtAddCallback (button, XmNcascadingCallback, xm_pull_down_callback,
			     (XtPointer)instance);
	      XtManageChild (button);
	    }
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          if (widget_list)
            XtFree ((char*) widget_list);
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	}
    }
  else if (!contents)
    {
      ac = 0;
      XtSetArg (al [ac], XmNsubMenuId, NULL); ac++;
      XtSetValues (widget, al, ac);
      XtDestroyWidget (menu);
    }
  else if (deep_p && contents->change != NO_CHANGE)
    xm_update_menu (instance, menu, val, 1);
}

static void
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xm_update_menu (widget_instance* instance,
                Widget widget,
                widget_value* val,
                Boolean deep_p)
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{
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  Widget* children;
  unsigned int num_children;
  int num_children_to_keep = 0;
  int i;
  widget_value* cur;

  children = XtCompositeChildren (widget, &num_children);

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  /* Widget is a RowColumn widget whose contents have to be updated
   * to reflect the list of items in val->contents */

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  /* See how many buttons we can keep, and how many we
     must completely replace.  */
  if (val->contents == 0)
    num_children_to_keep = 0;
  else if (val->contents->change == STRUCTURAL_CHANGE)
    {
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      if (children)
	{
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	  for (i = 0, cur = val->contents;
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               (i < num_children
		&& cur); /* how else to ditch unwanted children ?? - mgd */
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	       i++, cur = cur->next)
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	    {
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	      if (cur->this_one_change == STRUCTURAL_CHANGE)
		break;
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	    }
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	  num_children_to_keep = i;
	}
    }
  else
    num_children_to_keep = num_children;

  /* Update all the buttons of the RowColumn, in order,
     except for those we are going to replace entirely.  */
  if (children)
    {
      for (i = 0, cur = val->contents; i < num_children_to_keep; i++)
	{
	  if (!cur)
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	    {
	      num_children_to_keep = i;
	      break;
	    }
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	  if (children [i]->core.being_destroyed
	      || strcmp (XtName (children [i]), cur->name))
	    continue;
	  update_one_menu_entry (instance, children [i], cur, deep_p);
	  cur = cur->next;
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	}
    }
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  /* Now replace from scratch all the buttons after the last
     place that the top-level structure changed.  */
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  if (val->contents && val->contents->change == STRUCTURAL_CHANGE)
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    {
      destroy_all_children (widget, num_children_to_keep);
      make_menu_in_widget (instance, widget, val->contents,
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                           num_children_to_keep);
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    }

  XtFree ((char *) children);
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}


/* update text widgets */

static void
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xm_update_text (widget_instance* instance,
                Widget widget,
                widget_value* val)
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{
  XmTextSetString (widget, val->value ? val->value : "");
  XtRemoveAllCallbacks (widget, XmNactivateCallback);
  XtAddCallback (widget, XmNactivateCallback, xm_generic_callback, instance);
  XtRemoveAllCallbacks (widget, XmNvalueChangedCallback);
  XtAddCallback (widget, XmNvalueChangedCallback,
		 xm_internal_update_other_instances, instance);
}

static void
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xm_update_text_field (widget_instance* instance,
                      Widget widget,
                      widget_value* val)
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{
  XmTextFieldSetString (widget, val->value ? val->value : "");
  XtRemoveAllCallbacks (widget, XmNactivateCallback);
  XtAddCallback (widget, XmNactivateCallback, xm_generic_callback, instance);
  XtRemoveAllCallbacks (widget, XmNvalueChangedCallback);
  XtAddCallback (widget, XmNvalueChangedCallback,
		 xm_internal_update_other_instances, instance);
}


/* update a motif widget */

void
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xm_update_one_widget (widget_instance* instance,
                      Widget widget,
                      widget_value* val,
                      Boolean deep_p)
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{
  WidgetClass class;
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  /* Mark as not edited */
  val->edited = False;

  /* Common to all widget types */
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  XtSetSensitive (widget, val->enabled);
  XtVaSetValues (widget, XmNuserData, val->call_data, NULL);
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  /* Common to all label like widgets */
  if (XtIsSubclass (widget, xmLabelWidgetClass))
    xm_update_label (instance, widget, val);
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  class = XtClass (widget);
  /* Class specific things */
  if (class == xmPushButtonWidgetClass ||
      class == xmArrowButtonWidgetClass)
    {
      xm_update_pushbutton (instance, widget, val);
    }
  else if (class == xmCascadeButtonWidgetClass)
    {
      xm_update_cascadebutton (instance, widget, val);
    }
  else if (class == xmToggleButtonWidgetClass
	   || class == xmToggleButtonGadgetClass)
    {
      xm_update_toggle (instance, widget, val);
    }
  else if (class == xmRowColumnWidgetClass)
    {
      Boolean radiobox = 0;
      int ac = 0;
      Arg al [1];
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      XtSetArg (al [ac], XmNradioBehavior, &radiobox); ac++;
      XtGetValues (widget, al, ac);
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      if (radiobox)
	xm_update_radiobox (instance, widget, val);
      else
	xm_update_menu (instance, widget, val, deep_p);
    }
  else if (class == xmTextWidgetClass)
    {
      xm_update_text (instance, widget, val);
    }
  else if (class == xmTextFieldWidgetClass)
    {
      xm_update_text_field (instance, widget, val);
    }
  else if (class == xmListWidgetClass)
    {
      xm_update_list (instance, widget, val);
    }
}

/* getting the value back */
void
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xm_update_one_value (widget_instance* instance,
                     Widget widget,
                     widget_value* val)
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{
  WidgetClass class = XtClass (widget);
  widget_value *old_wv;

  /* copy the call_data slot into the "return" widget_value */
  for (old_wv = instance->info->val->contents; old_wv; old_wv = old_wv->next)
    if (!strcmp (val->name, old_wv->name))
      {
	val->call_data = old_wv->call_data;
	break;
      }
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  if (class == xmToggleButtonWidgetClass || class == xmToggleButtonGadgetClass)
    {
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      XtVaGetValues (widget, XmNset, &val->selected, NULL);
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      val->edited = True;
    }
  else if (class == xmTextWidgetClass)
    {
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      xfree (val->value);
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      val->value = XmTextGetString (widget);
      val->edited = True;
    }
  else if (class == xmTextFieldWidgetClass)
    {
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      xfree (val->value);
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      val->value = XmTextFieldGetString (widget);
      val->edited = True;
    }
  else if (class == xmRowColumnWidgetClass)
    {
      Boolean radiobox = 0;
      int ac = 0;
      Arg al [1];
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      XtSetArg (al [ac], XmNradioBehavior, &radiobox); ac++;
      XtGetValues (widget, al, ac);
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      if (radiobox)
	{
	  CompositeWidget radio = (CompositeWidget)widget;
	  int i;
	  for (i = 0; i < radio->composite.num_children; i++)
	    {
	      int set = False;
	      Widget toggle = radio->composite.children [i];
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	      XtVaGetValues (toggle, XmNset, &set, NULL);
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	      if (set)
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		dupstring (&val->value, XtName (toggle));
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	    }
	  val->edited = True;
	}
    }
  else if (class == xmListWidgetClass)
    {
      int pos_cnt;
      int* pos_list;
      if (XmListGetSelectedPos (widget, &pos_list, &pos_cnt))
	{
	  int i;
	  widget_value* cur;
	  for (cur = val->contents, i = 0; cur; cur = cur->next)
	    if (cur->value)
	      {
		int j;
		cur->selected = False;
		i += 1;
		for (j = 0; j < pos_cnt; j++)
		  if (pos_list [j] == i)
		    {
		      cur->selected = True;
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		      val->value = xstrdup (cur->name);
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		    }
	      }
	  val->edited = 1;
	  XtFree ((char *) pos_list);
	}
    }
}


/* This function is for activating a button from a program.  It's wrong because
   we pass a NULL argument in the call_data which is not Motif compatible.
   This is used from the XmNdefaultAction callback of the List widgets to
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   have a double-click put down a dialog box like the button would do.
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   I could not find a way to do that with accelerators.
 */
static void
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activate_button (Widget widget,
                 XtPointer closure,
                 XtPointer call_data)
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{
  Widget button = (Widget)closure;
  XtCallCallbacks (button, XmNactivateCallback, NULL);
}

/* creation functions */

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/* Called for key press in dialogs.  Used to pop down dialog on ESC.  */
static void
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dialog_key_cb (Widget widget,
               XtPointer closure,
               XEvent *event,
               Boolean *continue_to_dispatch)
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{
  KeySym sym = 0;
  Modifiers modif_ret;
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  XtTranslateKeycode (event->xkey.display, event->xkey.keycode, 0,
                      &modif_ret, &sym);
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  if (sym == osfXK_Cancel)
    {
      Widget w = *((Widget *) closure);

      while (w && ! XtIsShell (w))
        w = XtParent (w);

      if (XtIsShell (w)) XtPopdown (w);
    }

  *continue_to_dispatch = TRUE;
}

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/* dialogs */
static Widget
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make_dialog (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)
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{
  Widget result;
  Widget form;
  Widget row;
  Widget icon;
  Widget icon_separator;
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  Widget message_label;
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  Widget value = 0;
  Widget separator;
  Widget button = 0;
  Widget children [16];		/* for the final XtManageChildren */
  int	 n_children;
  Arg 	al[64];			/* Arg List */
  int 	ac;			/* Arg Count */
  int 	i;
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  if (pop_up_p)
    {
      ac = 0;
      XtSetArg(al[ac], XmNtitle, shell_title); ac++;
      XtSetArg(al[ac], XtNallowShellResize, True); ac++;
      XtSetArg(al[ac], XmNdeleteResponse, XmUNMAP); ac++;
      result = XmCreateDialogShell (parent, "dialog", al, ac);
      ac = 0;
      XtSetArg(al[ac], XmNautoUnmanage, FALSE); ac++;
/*      XtSetArg(al[ac], XmNautoUnmanage, TRUE); ac++; */ /* ####is this ok? */
      XtSetArg(al[ac], XmNnavigationType, XmTAB_GROUP); ac++;
      form = XmCreateForm (result, shell_title, al, ac);
    }
  else
    {
      ac = 0;
      XtSetArg(al[ac], XmNautoUnmanage, FALSE); ac++;
      XtSetArg(al[ac], XmNnavigationType, XmTAB_GROUP); ac++;
      form = XmCreateForm (parent, shell_title, al, ac);
      result = form;
    }

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  n_children = left_buttons + right_buttons + 1;
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  ac = 0;
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  XtSetArg(al[ac], XmNpacking, n_children == 3?
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	   XmPACK_COLUMN: XmPACK_TIGHT); ac++;
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  XtSetArg(al[ac], XmNorientation, n_children == 3?
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	   XmVERTICAL: XmHORIZONTAL); ac++;
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  XtSetArg(al[ac], XmNnumColumns, left_buttons + right_buttons + 1); ac++;
  XtSetArg(al[ac], XmNmarginWidth, 0); ac++;
  XtSetArg(al[ac], XmNmarginHeight, 0); ac++;
  XtSetArg(al[ac], XmNspacing, 13); ac++;
  XtSetArg(al[ac], XmNadjustLast, False); ac++;
  XtSetArg(al[ac], XmNalignment, XmALIGNMENT_CENTER); ac++;
  XtSetArg(al[ac], XmNisAligned, True); ac++;
  XtSetArg(al[ac], XmNtopAttachment, XmATTACH_NONE); ac++;
  XtSetArg(al[ac], XmNbottomAttachment, XmATTACH_FORM); ac++;
  XtSetArg(al[ac], XmNbottomOffset, 13); ac++;
  XtSetArg(al[ac], XmNleftAttachment, XmATTACH_FORM); ac++;
  XtSetArg(al[ac], XmNleftOffset, 13); ac++;
  XtSetArg(al[ac], XmNrightAttachment, XmATTACH_FORM); ac++;
  XtSetArg(al[ac], XmNrightOffset, 13); ac++;
  row = XmCreateRowColumn (form, "row", al, ac);
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  n_children = 0;
  for (i = 0; i < left_buttons; i++)
    {
      char button_name [16];
      sprintf (button_name, "button%d", i + 1);
      ac = 0;
      if (i == 0)
	{
	  XtSetArg(al[ac], XmNhighlightThickness, 1); ac++;
	  XtSetArg(al[ac], XmNshowAsDefault, TRUE); ac++;
	}
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      XtSetArg(al[ac], XmNmarginWidth, 10); ac++;
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      XtSetArg(al[ac], XmNnavigationType, XmTAB_GROUP); ac++;
      children [n_children] = XmCreatePushButton (row, button_name, al, ac);
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      XtAddEventHandler (children [n_children],
                         KeyPressMask, False, dialog_key_cb, result);
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      if (i == 0)
	{
	  button = children [n_children];
	  ac = 0;
	  XtSetArg(al[ac], XmNdefaultButton, button); ac++;
	  XtSetValues (row, al, ac);
	}

      n_children++;
    }

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  /* invisible separator button */
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  ac = 0;
  XtSetArg (al[ac], XmNmappedWhenManaged, FALSE); ac++;
  children [n_children] = XmCreateLabel (row, "separator_button", al, ac);
  n_children++;
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  for (i = 0; i < right_buttons; i++)
    {
      char button_name [16];
      sprintf (button_name, "button%d", left_buttons + i + 1);
      ac = 0;
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      XtSetArg(al[ac], XmNmarginWidth, 10); ac++;
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      XtSetArg(al[ac], XmNnavigationType, XmTAB_GROUP); ac++;
      children [n_children] = XmCreatePushButton (row, button_name, al, ac);
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      XtAddEventHandler (children [n_children],
                         KeyPressMask, False, dialog_key_cb, result);

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      if (! button) button = children [n_children];
      n_children++;
    }
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  XtManageChildren (children, n_children);
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  ac = 0;
  XtSetArg(al[ac], XmNtopAttachment, XmATTACH_NONE); ac++;
  XtSetArg(al[ac], XmNbottomAttachment, XmATTACH_WIDGET); ac++;
  XtSetArg(al[ac], XmNbottomOffset, 13); ac++;
  XtSetArg(al[ac], XmNbottomWidget, row); ac++;
  XtSetArg(al[ac], XmNleftAttachment, XmATTACH_FORM); ac++;
  XtSetArg(al[ac], XmNleftOffset, 0); ac++;
  XtSetArg(al[ac], XmNrightAttachment, XmATTACH_FORM); ac++;
  XtSetArg(al[ac], XmNrightOffset, 0); ac++;
  separator = XmCreateSeparator (form, "", al, ac);

  ac = 0;
  XtSetArg(al[ac], XmNlabelType, XmPIXMAP); ac++;
  XtSetArg(al[ac], XmNtopAttachment, XmATTACH_FORM); ac++;
  XtSetArg(al[ac], XmNtopOffset, 13); ac++;
  XtSetArg(al[ac], XmNbottomAttachment, XmATTACH_NONE); ac++;
  XtSetArg(al[ac], XmNleftAttachment, XmATTACH_FORM); ac++;
  XtSetArg(al[ac], XmNleftOffset, 13); ac++;
  XtSetArg(al[ac], XmNrightAttachment, XmATTACH_NONE); ac++;
  icon = XmCreateLabel (form, icon_name, al, ac);

  ac = 0;
  XtSetArg(al[ac], XmNmappedWhenManaged, FALSE); ac++;
  XtSetArg(al[ac], XmNtopAttachment, XmATTACH_WIDGET); ac++;
  XtSetArg(al[ac], XmNtopOffset, 6); ac++;
  XtSetArg(al[ac], XmNtopWidget, icon); ac++;
  XtSetArg(al[ac], XmNbottomAttachment, XmATTACH_WIDGET); ac++;
  XtSetArg(al[ac], XmNbottomOffset, 6); ac++;
  XtSetArg(al[ac], XmNbottomWidget, separator); ac++;
  XtSetArg(al[ac], XmNleftAttachment, XmATTACH_NONE); ac++;
  XtSetArg(al[ac], XmNrightAttachment, XmATTACH_NONE); ac++;
  icon_separator = XmCreateLabel (form, "", al, ac);

  if (text_input_slot)
    {
      ac = 0;
      XtSetArg(al[ac], XmNcolumns, 50); ac++;
      XtSetArg(al[ac], XmNtopAttachment, XmATTACH_NONE); ac++;
      XtSetArg(al[ac], XmNbottomAttachment, XmATTACH_WIDGET); ac++;
      XtSetArg(al[ac], XmNbottomOffset, 13); ac++;
      XtSetArg(al[ac], XmNbottomWidget, separator); ac++;
      XtSetArg(al[ac], XmNleftAttachment, XmATTACH_WIDGET); ac++;
      XtSetArg(al[ac], XmNleftOffset, 13); ac++;
      XtSetArg(al[ac], XmNleftWidget, icon); ac++;
      XtSetArg(al[ac], XmNrightAttachment, XmATTACH_FORM); ac++;
      XtSetArg(al[ac], XmNrightOffset, 13); ac++;
      value = XmCreateTextField (form, "value", al, ac);
    }
  else if (radio_box)
    {
      Widget radio_butt;
      ac = 0;
      XtSetArg(al[ac], XmNmarginWidth, 0); ac++;
      XtSetArg(al[ac], XmNmarginHeight, 0); ac++;
      XtSetArg(al[ac], XmNspacing, 13); ac++;
      XtSetArg(al[ac], XmNalignment, XmALIGNMENT_CENTER); ac++;
      XtSetArg(al[ac], XmNorientation, XmHORIZONTAL); ac++;
      XtSetArg(al[ac], XmNbottomAttachment, XmATTACH_WIDGET); ac++;
      XtSetArg(al[ac], XmNbottomOffset, 13); ac++;
      XtSetArg(al[ac], XmNbottomWidget, separator); ac++;
      XtSetArg(al[ac], XmNleftAttachment, XmATTACH_WIDGET); ac++;
      XtSetArg(al[ac], XmNleftOffset, 13); ac++;
      XtSetArg(al[ac], XmNleftWidget, icon); ac++;
      XtSetArg(al[ac], XmNrightAttachment, XmATTACH_FORM); ac++;
      XtSetArg(al[ac], XmNrightOffset, 13); ac++;
      value = XmCreateRadioBox (form, "radiobutton1", al, ac);
      ac = 0;
      i = 0;
      radio_butt = XmCreateToggleButtonGadget (value, "radio1", al, ac);
      children [i++] = radio_butt;
      radio_butt = XmCreateToggleButtonGadget (value, "radio2", al, ac);
      children [i++] = radio_butt;
      radio_butt = XmCreateToggleButtonGadget (value, "radio3", al, ac);
      children [i++] = radio_butt;
      XtManageChildren (children, i);
    }
  else if (list)
    {
      ac = 0;
      XtSetArg(al[ac], XmNvisibleItemCount, 5); ac++;
      XtSetArg(al[ac], XmNtopAttachment, XmATTACH_NONE); ac++;
      XtSetArg(al[ac], XmNbottomAttachment, XmATTACH_WIDGET); ac++;
      XtSetArg(al[ac], XmNbottomOffset, 13); ac++;
      XtSetArg(al[ac], XmNbottomWidget, separator); ac++;
      XtSetArg(al[ac], XmNleftAttachment, XmATTACH_WIDGET); ac++;
      XtSetArg(al[ac], XmNleftOffset, 13); ac++;
      XtSetArg(al[ac], XmNleftWidget, icon); ac++;
      XtSetArg(al[ac], XmNrightAttachment, XmATTACH_FORM); ac++;
      XtSetArg(al[ac], XmNrightOffset, 13); ac++;
      value = XmCreateScrolledList (form, "list", al, ac);

      /* this is the easiest way I found to have the dble click in the
	 list activate the default button */
      XtAddCallback (value, XmNdefaultActionCallback, activate_button, button);
    }
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  ac = 0;
  XtSetArg(al[ac], XmNalignment, XmALIGNMENT_BEGINNING); ac++;
  XtSetArg(al[ac], XmNtopAttachment, XmATTACH_FORM); ac++;
  XtSetArg(al[ac], XmNtopOffset, 13); ac++;
  XtSetArg(al[ac], XmNbottomAttachment, XmATTACH_WIDGET); ac++;
  XtSetArg(al[ac], XmNbottomOffset, 13); ac++;
  XtSetArg(al[ac], XmNbottomWidget,
	   text_input_slot || radio_box || list ? value : separator); ac++;
  XtSetArg(al[ac], XmNleftAttachment, XmATTACH_WIDGET); ac++;
  XtSetArg(al[ac], XmNleftOffset, 13); ac++;
  XtSetArg(al[ac], XmNleftWidget, icon); ac++;
  XtSetArg(al[ac], XmNrightAttachment, XmATTACH_FORM); ac++;
  XtSetArg(al[ac], XmNrightOffset, 13); ac++;
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  message_label = XmCreateLabel (form, "message", al, ac);
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  if (list)
    XtManageChild (value);

  i = 0;
  children [i] = row; i++;
  children [i] = separator; i++;
  if (text_input_slot || radio_box)
    {
      children [i] = value; i++;
    }
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  children [i] = message_label; i++;
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  children [i] = icon; i++;
  children [i] = icon_separator; i++;
  XtManageChildren (children, i);
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  if (text_input_slot || list)
    {
      XtInstallAccelerators (value, button);
      XtSetKeyboardFocus (result, value);
    }
  else
    {
      XtInstallAccelerators (form, button);
      XtSetKeyboardFocus (result, button);
    }
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  return result;
}

static destroyed_instance*
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find_matching_instance (widget_instance* instance)
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{
  destroyed_instance*	cur;
  destroyed_instance*	prev;
  char*	type = instance->info->type;
  char*	name = instance->info->name;

  for (prev = NULL, cur = all_destroyed_instances;
       cur;
       prev = cur, cur = cur->next)
    {
      if (!strcmp (cur->name, name)
	  && !strcmp (cur->type, type)
	  && cur->parent == instance->parent
	  && cur->pop_up_p == instance->pop_up_p)
	{
	  if (prev)
	    prev->next = cur->next;
	  else
	    all_destroyed_instances = cur->next;
	  return cur;
	}
      /* do some cleanup */
      else if (!cur->widget)
	{
	  if (prev)
	    prev->next = cur->next;
	  else
	    all_destroyed_instances = cur->next;
	  free_destroyed_instance (cur);
	  cur = prev ? prev : all_destroyed_instances;
	}
    }
  return NULL;
}

static void
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mark_dead_instance_destroyed (Widget widget,
                              XtPointer closure,
                              XtPointer call_data)
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{
  destroyed_instance* instance = (destroyed_instance*)closure;
  instance->widget = NULL;
}

static void
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recenter_widget (Widget widget)
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{
  Widget parent = XtParent (widget);
  Screen* screen = XtScreen (widget);
  Dimension screen_width = WidthOfScreen (screen);
  Dimension screen_height = HeightOfScreen (screen);
  Dimension parent_width = 0;
  Dimension parent_height = 0;
  Dimension child_width = 0;
  Dimension child_height = 0;
  Position x;
  Position y;

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  XtVaGetValues (widget, XtNwidth, &child_width, XtNheight, &child_height, NULL);
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  XtVaGetValues (parent, XtNwidth, &parent_width, XtNheight, &parent_height,
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		 NULL);
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  x = (((Position)parent_width) - ((Position)child_width)) / 2;
  y = (((Position)parent_height) - ((Position)child_height)) / 2;
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  XtTranslateCoords (parent, x, y, &x, &y);

  if (x + child_width > screen_width)
    x = screen_width - child_width;
  if (x < 0)
    x = 0;

  if (y + child_height > screen_height)
    y = screen_height - child_height;
  if (y < 0)
    y = 0;

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  XtVaSetValues (widget, XtNx, x, XtNy, y, NULL);
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}

static Widget
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recycle_instance (destroyed_instance* instance)
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{
  Widget widget = instance->widget;

  /* widget is NULL if the parent was destroyed. */
  if (widget)
    {
      Widget focus;
      Widget separator;

      /* Remove the destroy callback as the instance is not in the list
	 anymore */
      XtRemoveCallback (instance->parent, XtNdestroyCallback,
			mark_dead_instance_destroyed,
			(XtPointer)instance);

      /* Give the focus to the initial item */
      focus = XtNameToWidget (widget, "*value");
      if (!focus)
	focus = XtNameToWidget (widget, "*button1");
      if (focus)
	XtSetKeyboardFocus (widget, focus);
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      /* shrink the separator label back to their original size */
      separator = XtNameToWidget (widget, "*separator_button");
      if (separator)
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	XtVaSetValues (separator, XtNwidth, 5, XtNheight, 5, NULL);
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      /* Center the dialog in its parent */
      recenter_widget (widget);
    }
  free_destroyed_instance (instance);
  return widget;
}

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

  /* try to find a widget to recycle */
  dead_one = find_matching_instance (instance);
  if (dead_one)
    {
      Widget recycled_widget = recycle_instance (dead_one);
      if (recycled_widget)
	return recycled_widget;
    }

  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;
  }
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