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 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <string.h>
  23 #include <memory.h>
  24
  25 #include <X11/Xatom.h>
  26 #include <X11/IntrinsicP.h>
  27 #include <X11/ObjectP.h>
  28 #include "lwlib-utils.h"
  29
  30 /* Redisplay the contents of the widget, without first clearing it. */
  31 void
  32 XtNoClearRefreshWidget (widget)
  33      Widget widget;
  34 {
  35   XEvent event;
  36
  37   event.type = Expose;
  38   event.xexpose.serial = 0;
  39   event.xexpose.send_event = 0;
  40   event.xexpose.display = XtDisplay (widget);
  41   event.xexpose.window = XtWindow (widget);
  42   event.xexpose.x = 0;
  43   event.xexpose.y = 0;
  44   event.xexpose.width = widget->core.width;
  45   event.xexpose.height = widget->core.height;
  46   event.xexpose.count = 0;
  47
  48   (*widget->core.widget_class->core_class.expose)
  49     (widget, &event, (Region)NULL);
  50 }
  51
  52
  53 /*
  54  * Apply a function to all the subwidgets of a given widget recursively.
  55 */
  56 void
  57 XtApplyToWidgets (w, proc, arg)
  58      Widget w;
  59      XtApplyToWidgetsProc proc;
  60      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 *) malloc (sizeof (Widget) * nkids);
  70       int i;
  71       memcpy (kids, cw->composite.children, sizeof (Widget) * nkids);
  72       for (i = 0; i < nkids; i++)
  73 /* This prevent us from using gadgets, why is it here? */
  74 /*      if (XtIsWidget (kids [i])) */
  75           {
  76             /* do the kiddies first in case we're destroying */
  77             XtApplyToWidgets (kids [i], proc, arg);
  78             proc (kids [i], arg);
  79           }
  80       free (kids);
  81     }
  82 }
  83
  84
  85 /*
  86  * Apply a function to all the subwidgets of a given widget recursively.
  87  * Stop as soon as the function returns non NULL and returns this as a value.
  88  */
  89 void *
  90 XtApplyUntilToWidgets (w, proc, arg)
  91      Widget w;
  92      XtApplyUntilToWidgetsProc proc;
  93      XtPointer arg;
  94 {
  95   void* result;
  96   if (XtIsComposite (w))
  97     {
  98       CompositeWidget cw = (CompositeWidget)w;
  99       int i;
 100       for (i = 0; i < cw->composite.num_children; i++)
 101         if (XtIsWidget (cw->composite.children [i])){
 102           result = proc (cw->composite.children [i], arg);
 103           if (result)
 104             return result;
 105           result = XtApplyUntilToWidgets (cw->composite.children [i], proc,
 106                                           arg);
 107           if (result)
 108             return result;
 109         }
 110     }
 111   return NULL;
 112 }
 113
 114
 115 /*
 116  * Returns a copy of the list of all children of a composite widget
 117  */
 118 Widget *
 119 XtCompositeChildren (widget, number)
 120      Widget widget;
 121      unsigned int* number;
 122 {
 123   CompositeWidget cw = (CompositeWidget)widget;
 124   Widget* result;
 125   int n;
 126   int i;
 127
 128   if (!XtIsComposite (widget))
 129     {
 130       *number = 0;
 131       return NULL;
 132     }
 133   n = cw->composite.num_children;
 134   result = (Widget*)XtMalloc (n * sizeof (Widget));
 135   *number = n;
 136   for (i = 0; i < n; i++)
 137     result [i] = cw->composite.children [i];
 138   return result;
 139 }
 140
 141 Boolean
 142 XtWidgetBeingDestroyedP (widget)
 143      Widget widget;
 144 {
 145   return widget->core.being_destroyed;
 146 }
 147
 148 void
 149 XtSafelyDestroyWidget (widget)
 150      Widget widget;
 151 {
 152 #if 0
 153
 154   /* this requires IntrinsicI.h (actually, InitialI.h) */
 155
 156   XtAppContext app = XtWidgetToApplicationContext(widget);
 157
 158   if (app->dispatch_level == 0)
 159     {
 160       app->dispatch_level = 1;
 161       XtDestroyWidget (widget);
 162       /* generates an event so that the event loop will be called */
 163       XChangeProperty (XtDisplay (widget), XtWindow (widget),
 164                        XA_STRING, XA_STRING, 32, PropModeAppend, NULL, 0);
 165       app->dispatch_level = 0;
 166     }
 167   else
 168     XtDestroyWidget (widget);
 169
 170 #else
 171   abort ();
 172 #endif
 173 }