lwlib/lwlib-utils.c

   1 /* Defines some widget utility functions.
   2
   3 Copyright (C) 1992 Lucid, Inc.
   4 Copyright (C) 1994, 2001-2012 Free Software Foundation, Inc.
   5
   6 This file is part of the Lucid Widget Library.
   7
   8 The Lucid Widget Library is free software; you can redistribute it and/or
   9 modify it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 1, or (at your option)
  11 any later version.
  12
  13 The Lucid Widget Library is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU Emacs; see the file COPYING.  If not, write to
  20 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21 Boston, MA 02110-1301, USA.  */
  22
  23 #include <config.h>
  24
  25 #include <setjmp.h>
  26 #include <lisp.h>
  27
  28 #include <X11/Xatom.h>
  29 #include <X11/IntrinsicP.h>
  30 #include <X11/ObjectP.h>
  31 #include "lwlib-utils.h"
  32 #include "lwlib.h"
  33
  34 /* Redisplay the contents of the widget, without first clearing it. */
  35 void
  36 XtNoClearRefreshWidget (Widget widget)
  37 {
  38   XEvent event;
  39
  40   event.type = Expose;
  41   event.xexpose.serial = 0;
  42   event.xexpose.send_event = 0;
  43   event.xexpose.display = XtDisplay (widget);
  44   event.xexpose.window = XtWindow (widget);
  45   event.xexpose.x = 0;
  46   event.xexpose.y = 0;
  47   event.xexpose.width = widget->core.width;
  48   event.xexpose.height = widget->core.height;
  49   event.xexpose.count = 0;
  50
  51   (*widget->core.widget_class->core_class.expose)
  52     (widget, &event, (Region)NULL);
  53 }
  54
  55
  56 /*
  57  * Apply a function to all the subwidgets of a given widget recursively.
  58 */
  59 void
  60 XtApplyToWidgets (Widget w, XtApplyToWidgetsProc proc, XtPointer arg)
  61 {
  62   if (XtIsComposite (w))
  63     {
  64       CompositeWidget cw = (CompositeWidget) w;
  65       /* We have to copy the children list before mapping over it, because
  66          the procedure might add/delete elements, which would lose badly.
  67          */
  68       int nkids = cw->composite.num_children;
  69       Widget *kids = (Widget *) xmalloc (sizeof (Widget) * nkids);
  70       int i;
  71       memcpy ((char *) kids, (char *) cw->composite.children,
  72               sizeof (Widget) * nkids);
  73       for (i = 0; i < nkids; i++)
  74 /* This prevent us from using gadgets, why is it here? */
  75 /*      if (XtIsWidget (kids [i])) */
  76           {
  77             /* do the kiddies first in case we're destroying */
  78             XtApplyToWidgets (kids [i], proc, arg);
  79             proc (kids [i], arg);
  80           }
  81       xfree (kids);
  82     }
  83 }
  84
  85
  86 /*
  87  * Apply a function to all the subwidgets of a given widget recursively.
  88  * Stop as soon as the function returns non NULL and returns this as a value.
  89  */
  90 void *
  91 XtApplyUntilToWidgets (Widget w, XtApplyUntilToWidgetsProc proc, XtPointer arg)
  92 {
  93   void* result;
  94   if (XtIsComposite (w))
  95     {
  96       CompositeWidget cw = (CompositeWidget)w;
  97       int i;
  98       for (i = 0; i < cw->composite.num_children; i++)
  99         if (XtIsWidget (cw->composite.children [i])){
 100           result = proc (cw->composite.children [i], arg);
 101           if (result)
 102             return result;
 103           result = XtApplyUntilToWidgets (cw->composite.children [i], proc,
 104                                           arg);
 105           if (result)
 106             return result;
 107         }
 108     }
 109   return NULL;
 110 }
 111
 112
 113 /*
 114  * Returns a copy of the list of all children of a composite widget
 115  */
 116 Widget *
 117 XtCompositeChildren (Widget widget, unsigned int *number)
 118 {
 119   CompositeWidget cw = (CompositeWidget)widget;
 120   Widget* result;
 121   int n;
 122   int i;
 123
 124   if (!XtIsComposite (widget))
 125     {
 126       *number = 0;
 127       return NULL;
 128     }
 129   n = cw->composite.num_children;
 130   result = (Widget*)(void*)XtMalloc (n * sizeof (Widget));
 131   *number = n;
 132   for (i = 0; i < n; i++)
 133     result [i] = cw->composite.children [i];
 134   return result;
 135 }
 136
 137 Boolean
 138 XtWidgetBeingDestroyedP (Widget widget)
 139 {
 140   return widget->core.being_destroyed;
 141 }