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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 GNU Emacs; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include <stdlib.h>
- #include <unistd.h>
- #include <string.h>
- #include <memory.h>
-
- #include <X11/Xatom.h>
- #include <X11/IntrinsicP.h>
- #include <X11/ObjectP.h>
- #include "lwlib-utils.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 (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;
- 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
- }
-