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/* Defines some widget utility functions.
Copyright (C) 1992 Lucid, 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 XEmacs; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <X11/Xatom.h>
#include <X11/IntrinsicP.h>
#include <X11/ObjectP.h>
#include "lwlib-utils.h"
void
destroy_all_children (Widget widget)
{
Widget* children;
unsigned int number;
int i;
children = XtCompositeChildren (widget, &number);
if (children)
{
/* Unmanage all children and destroy them. They will only be
* really destroyed when we get out of DispatchEvent. */
for (i = 0; i < (int) number; i++)
{
Widget child = children [i];
if (!child->core.being_destroyed)
{
XtUnmanageChild (child);
XtDestroyWidget (child);
}
}
XtFree ((char *) children);
}
}
/* Redisplay the contents of the widget, without first clearing it. */
void
XtNoClearRefreshWidget (Widget widget)
{
XEvent event;
XExposeEvent* ev = &event.xexpose;
ev->type = Expose;
ev->serial = 0;
ev->send_event = 0;
ev->display = XtDisplay (widget);
ev->window = XtWindow (widget);
ev->x = 0;
ev->y = 0;
ev->width = widget->core.width;
ev->height = widget->core.height;
ev->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 (kids, 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;
unsigned 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
}
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