emacs/lwlib/lwlib-utils.c

/* Defines some widget utility functions.
Copyright (C) 1992 Lucid, Inc.
Copyright (C) 1994, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
  2010, 2011 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

/* Definitions of these in config.h can cause
   declaration conflicts later on between declarations for index
   and declarations for strchr.  This file doesn't use
   index and rindex, so cancel them.  */
#undef index
#undef rindex

#include <setjmp.h>
#include "../src/lisp.h"

#include <X11/Xatom.h>
#include <X11/IntrinsicP.h>
#include <X11/ObjectP.h>
#include "lwlib-utils.h"
#include "lwlib.h"

/* Redisplay the contents of the widget, without first clearing it. */
void
XtNoClearRefreshWidget (Widget widget)
{
  XEvent event;

  event.type = Expose;
  event.xexpose.serial = 0;
  event.xexpose.send_event = 0;
  event.xexpose.display = XtDisplay (widget);
  event.xexpose.window = XtWindow (widget);
  event.xexpose.x = 0;
  event.xexpose.y = 0;
  event.xexpose.width = widget->core.width;
  event.xexpose.height = widget->core.height;
  event.xexpose.count = 0;

  (*widget->core.widget_class->core_class.expose)
    (widget, &event, (Region)NULL);
}


/*
 * Apply a function to all the subwidgets of a given widget recursively.
*/
void
XtApplyToWidgets (Widget w, XtApplyToWidgetsProc proc, XtPointer arg)
{
  if (XtIsComposite (w))
    {
      CompositeWidget cw = (CompositeWidget) w;
      /* We have to copy the children list before mapping over it, because
	 the procedure might add/delete elements, which would lose badly.
	 */
      int nkids = cw->composite.num_children;
      Widget *kids = (Widget *) malloc (sizeof (Widget) * nkids);
      int i;
      memcpy ((char *) kids, (char *) cw->composite.children,
	      sizeof (Widget) * nkids);
      for (i = 0; i < nkids; i++)
/* This prevent us from using gadgets, why is it here? */
/*	if (XtIsWidget (kids [i])) */
	  {
	    /* do the kiddies first in case we're destroying */
	    XtApplyToWidgets (kids [i], proc, arg);
	    proc (kids [i], arg);
	  }
      free (kids);
    }
}


/*
 * Apply a function to all the subwidgets of a given widget recursively.
 * Stop as soon as the function returns non NULL and returns this as a value.
 */
void *
XtApplyUntilToWidgets (Widget w, XtApplyUntilToWidgetsProc proc, XtPointer arg)
{
  void* result;
  if (XtIsComposite (w))
    {
      CompositeWidget cw = (CompositeWidget)w;
      int i;
      for (i = 0; i < cw->composite.num_children; i++)
	if (XtIsWidget (cw->composite.children [i])){
	  result = proc (cw->composite.children [i], arg);
	  if (result)
	    return result;
	  result = XtApplyUntilToWidgets (cw->composite.children [i], proc,
					  arg);
	  if (result)
	    return result;
	}
    }
  return NULL;
}


/*
 * Returns a copy of the list of all children of a composite widget
 */
Widget *
XtCompositeChildren (Widget widget, unsigned int *number)
{
  CompositeWidget cw = (CompositeWidget)widget;
  Widget* result;
  int n;
  int i;

  if (!XtIsComposite (widget))
    {
      *number = 0;
      return NULL;
    }
  n = cw->composite.num_children;
  result = (Widget*)XtMalloc (n * sizeof (Widget));
  *number = n;
  for (i = 0; i < n; i++)
    result [i] = cw->composite.children [i];
  return result;
}

Boolean
XtWidgetBeingDestroyedP (Widget widget)
{
  return widget->core.being_destroyed;
}

void
XtSafelyDestroyWidget (Widget widget)
{
#if 0

  /* this requires IntrinsicI.h (actually, InitialI.h) */

  XtAppContext app = XtWidgetToApplicationContext(widget);

  if (app->dispatch_level == 0)
    {
      app->dispatch_level = 1;
      XtDestroyWidget (widget);
      /* generates an event so that the event loop will be called */
      XChangeProperty (XtDisplay (widget), XtWindow (widget),
		       XA_STRING, XA_STRING, 32, PropModeAppend, NULL, 0);
      app->dispatch_level = 0;
    }
  else
    XtDestroyWidget (widget);

#else
  abort ();
#endif
}