lwlib/lwlib-utils.c

   1 /* Defines some widget utility functions.
   2    Copyright (C) 1992 Lucid, Inc.
   3
   4 This file is part of the Lucid Widget Library.
   5
   6 The Lucid Widget Library is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 1, or (at your option)
   9 any later version.
  10
  11 The Lucid Widget Library is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include <X11/Xatom.h>
  25 #include <X11/IntrinsicP.h>
  26 #include <X11/ObjectP.h>
  27 #include "lwlib-utils.h"
  28
  29 /* Redisplay the contents of the widget, without first clearing it. */
  30 void
  31 XtNoClearRefreshWidget (widget)
  32      Widget widget;
  33 {
  34   XEvent event;
  35
  36   event.type = Expose;
  37   event.xexpose.serial = 0;
  38   event.xexpose.send_event = 0;
  39   event.xexpose.display = XtDisplay (widget);
  40   event.xexpose.window = XtWindow (widget);
  41   event.xexpose.x = 0;
  42   event.xexpose.y = 0;
  43   event.xexpose.width = widget->core.width;
  44   event.xexpose.height = widget->core.height;
  45   event.xexpose.count = 0;
  46
  47   (*widget->core.widget_class->core_class.expose)
  48     (widget, &event, (Region)NULL);
  49 }
  50
  51
  52 /*
  53  * Apply a function to all the subwidgets of a given widget recursively.
  54 */
  55 void
  56 XtApplyToWidgets (w, proc, arg)
  57      Widget w;
  58      XtApplyToWidgetsProc proc;
  59      XtPointer arg;
  60 {
  61   if (XtIsComposite (w))
  62     {
  63       CompositeWidget cw = (CompositeWidget) w;
  64       /* We have to copy the children list before mapping over it, because
  65          the procedure might add/delete elements, which would lose badly.
  66          */
  67       int nkids = cw->composite.num_children;
  68       Widget *kids = (Widget *) malloc (sizeof (Widget) * nkids);
  69       int i;
  70       lwlib_bcopy (cw->composite.children, kids, 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       free (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 (w, proc, arg)
  90      Widget w;
  91      XtApplyUntilToWidgetsProc proc;
  92      XtPointer arg;
  93 {
  94   void* result;
  95   if (XtIsComposite (w))
  96     {
  97       CompositeWidget cw = (CompositeWidget)w;
  98       int i;
  99       for (i = 0; i < cw->composite.num_children; i++)
 100         if (XtIsWidget (cw->composite.children [i])){
 101           result = proc (cw->composite.children [i], arg);
 102           if (result)
 103             return result;
 104           result = XtApplyUntilToWidgets (cw->composite.children [i], proc,
 105                                           arg);
 106           if (result)
 107             return result;
 108         }
 109     }
 110   return NULL;
 111 }
 112
 113
 114 /*
 115  * Returns a copy of the list of all children of a composite widget
 116  */
 117 Widget *
 118 XtCompositeChildren (widget, number)
 119      Widget widget;
 120      unsigned int* number;
 121 {
 122   CompositeWidget cw = (CompositeWidget)widget;
 123   Widget* result;
 124   int n;
 125   int i;
 126
 127   if (!XtIsComposite (widget))
 128     {
 129       *number = 0;
 130       return NULL;
 131     }
 132   n = cw->composite.num_children;
 133   result = (Widget*)XtMalloc (n * sizeof (Widget));
 134   *number = n;
 135   for (i = 0; i < n; i++)
 136     result [i] = cw->composite.children [i];
 137   return result;
 138 }
 139
 140 Boolean
 141 XtWidgetBeingDestroyedP (widget)
 142      Widget widget;
 143 {
 144   return widget->core.being_destroyed;
 145 }
 146
 147 void
 148 XtSafelyDestroyWidget (widget)
 149      Widget widget;
 150 {
 151 #if 0
 152
 153   /* this requires IntrinsicI.h (actually, InitialI.h) */
 154
 155   XtAppContext app = XtWidgetToApplicationContext(widget);
 156
 157   if (app->dispatch_level == 0)
 158     {
 159       app->dispatch_level = 1;
 160       XtDestroyWidget (widget);
 161       /* generates an event so that the event loop will be called */
 162       XChangeProperty (XtDisplay (widget), XtWindow (widget),
 163                        XA_STRING, XA_STRING, 32, PropModeAppend, NULL, 0);
 164       app->dispatch_level = 0;
 165     }
 166   else
 167     XtDestroyWidget (widget);
 168
 169 #else
 170   abort ();
 171 #endif
 172 }