lwlib/lwlib-utils.c

   1 /* Defines some widget utility functions.
   2 Copyright (C) 1992 Lucid, Inc.
   3 Copyright (C) 1994, 2001-2011 Free Software Foundation, Inc.
   4
   5 This file is part of the Lucid Widget Library.
   6
   7 The Lucid Widget Library is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 1, or (at your option)
  10 any later version.
  11
  12 The Lucid Widget Library is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 /* Definitions of these in config.h can cause
  27    declaration conflicts later on between declarations for index
  28    and declarations for strchr.  This file doesn't use
  29    index and rindex, so cancel them.  */
  30 #undef index
  31 #undef rindex
  32
  33 #include <setjmp.h>
  34 #include "../src/lisp.h"
  35
  36 #include <X11/Xatom.h>
  37 #include <X11/IntrinsicP.h>
  38 #include <X11/ObjectP.h>
  39 #include "lwlib-utils.h"
  40 #include "lwlib.h"
  41
  42 /* Redisplay the contents of the widget, without first clearing it. */
  43 void
  44 XtNoClearRefreshWidget (Widget widget)
  45 {
  46   XEvent event;
  47
  48   event.type = Expose;
  49   event.xexpose.serial = 0;
  50   event.xexpose.send_event = 0;
  51   event.xexpose.display = XtDisplay (widget);
  52   event.xexpose.window = XtWindow (widget);
  53   event.xexpose.x = 0;
  54   event.xexpose.y = 0;
  55   event.xexpose.width = widget->core.width;
  56   event.xexpose.height = widget->core.height;
  57   event.xexpose.count = 0;
  58
  59   (*widget->core.widget_class->core_class.expose)
  60     (widget, &event, (Region)NULL);
  61 }
  62
  63
  64 /*
  65  * Apply a function to all the subwidgets of a given widget recursively.
  66 */
  67 void
  68 XtApplyToWidgets (Widget w, XtApplyToWidgetsProc proc, XtPointer arg)
  69 {
  70   if (XtIsComposite (w))
  71     {
  72       CompositeWidget cw = (CompositeWidget) w;
  73       /* We have to copy the children list before mapping over it, because
  74          the procedure might add/delete elements, which would lose badly.
  75          */
  76       int nkids = cw->composite.num_children;
  77       Widget *kids = (Widget *) malloc (sizeof (Widget) * nkids);
  78       int i;
  79       memcpy ((char *) kids, (char *) cw->composite.children,
  80               sizeof (Widget) * nkids);
  81       for (i = 0; i < nkids; i++)
  82 /* This prevent us from using gadgets, why is it here? */
  83 /*      if (XtIsWidget (kids [i])) */
  84           {
  85             /* do the kiddies first in case we're destroying */
  86             XtApplyToWidgets (kids [i], proc, arg);
  87             proc (kids [i], arg);
  88           }
  89       free (kids);
  90     }
  91 }
  92
  93
  94 /*
  95  * Apply a function to all the subwidgets of a given widget recursively.
  96  * Stop as soon as the function returns non NULL and returns this as a value.
  97  */
  98 void *
  99 XtApplyUntilToWidgets (Widget w, XtApplyUntilToWidgetsProc proc, XtPointer arg)
 100 {
 101   void* result;
 102   if (XtIsComposite (w))
 103     {
 104       CompositeWidget cw = (CompositeWidget)w;
 105       int i;
 106       for (i = 0; i < cw->composite.num_children; i++)
 107         if (XtIsWidget (cw->composite.children [i])){
 108           result = proc (cw->composite.children [i], arg);
 109           if (result)
 110             return result;
 111           result = XtApplyUntilToWidgets (cw->composite.children [i], proc,
 112                                           arg);
 113           if (result)
 114             return result;
 115         }
 116     }
 117   return NULL;
 118 }
 119
 120
 121 /*
 122  * Returns a copy of the list of all children of a composite widget
 123  */
 124 Widget *
 125 XtCompositeChildren (Widget widget, unsigned int *number)
 126 {
 127   CompositeWidget cw = (CompositeWidget)widget;
 128   Widget* result;
 129   int n;
 130   int i;
 131
 132   if (!XtIsComposite (widget))
 133     {
 134       *number = 0;
 135       return NULL;
 136     }
 137   n = cw->composite.num_children;
 138   result = (Widget*)XtMalloc (n * sizeof (Widget));
 139   *number = n;
 140   for (i = 0; i < n; i++)
 141     result [i] = cw->composite.children [i];
 142   return result;
 143 }
 144
 145 Boolean
 146 XtWidgetBeingDestroyedP (Widget widget)
 147 {
 148   return widget->core.being_destroyed;
 149 }
 150
 151 void
 152 XtSafelyDestroyWidget (Widget widget)
 153 {
 154 #if 0
 155
 156   /* this requires IntrinsicI.h (actually, InitialI.h) */
 157
 158   XtAppContext app = XtWidgetToApplicationContext(widget);
 159
 160   if (app->dispatch_level == 0)
 161     {
 162       app->dispatch_level = 1;
 163       XtDestroyWidget (widget);
 164       /* generates an event so that the event loop will be called */
 165       XChangeProperty (XtDisplay (widget), XtWindow (widget),
 166                        XA_STRING, XA_STRING, 32, PropModeAppend, NULL, 0);
 167       app->dispatch_level = 0;
 168     }
 169   else
 170     XtDestroyWidget (widget);
 171
 172 #else
 173   abort ();
 174 #endif
 175 }
 176