lwlib/lwlib-utils.c

   1 /* Defines some widget utility functions.
   2
   3 Copyright (C) 1992 Lucid, Inc.
   4 Copyright (C) 1994, 2001-2017 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.  If not, see <https://www.gnu.org/licenses/>.  */
  20
  21 #include <config.h>
  22
  23 #include <setjmp.h>
  24 #include <lisp.h>
  25
  26 #include <X11/Xatom.h>
  27 #include <X11/IntrinsicP.h>
  28 #include <X11/ObjectP.h>
  29 #include "lwlib-utils.h"
  30 #include "lwlib.h"
  31
  32 /* Redisplay the contents of the widget, without first clearing it. */
  33 void
  34 XtNoClearRefreshWidget (Widget widget)
  35 {
  36   XEvent event;
  37
  38   event.type = Expose;
  39   event.xexpose.serial = 0;
  40   event.xexpose.send_event = 0;
  41   event.xexpose.display = XtDisplay (widget);
  42   event.xexpose.window = XtWindow (widget);
  43   event.xexpose.x = 0;
  44   event.xexpose.y = 0;
  45   event.xexpose.width = widget->core.width;
  46   event.xexpose.height = widget->core.height;
  47   event.xexpose.count = 0;
  48
  49   (*widget->core.widget_class->core_class.expose)
  50     (widget, &event, (Region)NULL);
  51 }
  52
  53
  54 /*
  55  * Apply a function to all the subwidgets of a given widget recursively.
  56 */
  57 void
  58 XtApplyToWidgets (Widget w, XtApplyToWidgetsProc proc, XtPointer arg)
  59 {
  60   if (XtIsComposite (w))
  61     {
  62       CompositeWidget cw = (CompositeWidget) w;
  63       /* We have to copy the children list before mapping over it, because
  64          the procedure might add/delete elements, which would lose badly.
  65          */
  66       int nkids = cw->composite.num_children;
  67       Widget *kids = (Widget *) xmalloc (sizeof (Widget) * nkids);
  68       int i;
  69       memcpy ((char *) kids, (char *) cw->composite.children,
  70               sizeof (Widget) * nkids);
  71       for (i = 0; i < nkids; i++)
  72 /* This prevent us from using gadgets, why is it here? */
  73 /*      if (XtIsWidget (kids [i])) */
  74           {
  75             /* do the kiddies first in case we're destroying */
  76             XtApplyToWidgets (kids [i], proc, arg);
  77             proc (kids [i], arg);
  78           }
  79       xfree (kids);
  80     }
  81 }
  82
  83
  84 /*
  85  * Apply a function to all the subwidgets of a given widget recursively.
  86  * Stop as soon as the function returns non NULL and returns this as a value.
  87  */
  88 void *
  89 XtApplyUntilToWidgets (Widget w, XtApplyUntilToWidgetsProc proc, XtPointer arg)
  90 {
  91   void* result;
  92   if (XtIsComposite (w))
  93     {
  94       CompositeWidget cw = (CompositeWidget)w;
  95       int i;
  96       for (i = 0; i < cw->composite.num_children; i++)
  97         if (XtIsWidget (cw->composite.children [i])){
  98           result = proc (cw->composite.children [i], arg);
  99           if (result)
 100             return result;
 101           result = XtApplyUntilToWidgets (cw->composite.children [i], proc,
 102                                           arg);
 103           if (result)
 104             return result;
 105         }
 106     }
 107   return NULL;
 108 }
 109
 110
 111 /*
 112  * Returns a copy of the list of all children of a composite widget
 113  */
 114 Widget *
 115 XtCompositeChildren (Widget widget, unsigned int *number)
 116 {
 117   CompositeWidget cw = (CompositeWidget)widget;
 118   Widget* result;
 119   int n;
 120   int i;
 121
 122   if (!XtIsComposite (widget))
 123     {
 124       *number = 0;
 125       return NULL;
 126     }
 127   n = cw->composite.num_children;
 128   result = (Widget*)(void*)XtMalloc (n * sizeof (Widget));
 129   *number = n;
 130   for (i = 0; i < n; i++)
 131     result [i] = cw->composite.children [i];
 132   return result;
 133 }
 134
 135 Boolean
 136 XtWidgetBeingDestroyedP (Widget widget)
 137 {
 138   return widget->core.being_destroyed;
 139 }