lwlib/lwlib-utils.c

   1 /* Defines some widget utility functions.
   2 Copyright (C) 1992 Lucid, Inc.
   3 Copyright (C) 1994, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
   4   2010 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 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 /* Definitions of these in config.h can cause
  28    declaration conflicts later on between declarations for index
  29    and declarations for strchr.  This file doesn't use
  30    index and rindex, so cancel them.  */
  31 #undef index
  32 #undef rindex
  33
  34 #include <setjmp.h>
  35 #include "../src/lisp.h"
  36
  37 #include <X11/Xatom.h>
  38 #include <X11/IntrinsicP.h>
  39 #include <X11/ObjectP.h>
  40 #include "lwlib-utils.h"
  41 #include "lwlib.h"
  42
  43 /* Redisplay the contents of the widget, without first clearing it. */
  44 void
  45 XtNoClearRefreshWidget (widget)
  46      Widget widget;
  47 {
  48   XEvent event;
  49
  50   event.type = Expose;
  51   event.xexpose.serial = 0;
  52   event.xexpose.send_event = 0;
  53   event.xexpose.display = XtDisplay (widget);
  54   event.xexpose.window = XtWindow (widget);
  55   event.xexpose.x = 0;
  56   event.xexpose.y = 0;
  57   event.xexpose.width = widget->core.width;
  58   event.xexpose.height = widget->core.height;
  59   event.xexpose.count = 0;
  60
  61   (*widget->core.widget_class->core_class.expose)
  62     (widget, &event, (Region)NULL);
  63 }
  64
  65
  66 /*
  67  * Apply a function to all the subwidgets of a given widget recursively.
  68 */
  69 void
  70 XtApplyToWidgets (w, proc, arg)
  71      Widget w;
  72      XtApplyToWidgetsProc proc;
  73      XtPointer arg;
  74 {
  75   if (XtIsComposite (w))
  76     {
  77       CompositeWidget cw = (CompositeWidget) w;
  78       /* We have to copy the children list before mapping over it, because
  79          the procedure might add/delete elements, which would lose badly.
  80          */
  81       int nkids = cw->composite.num_children;
  82       Widget *kids = (Widget *) malloc (sizeof (Widget) * nkids);
  83       int i;
  84       lwlib_bcopy ((char *) cw->composite.children, (char *) kids,
  85                    sizeof (Widget) * nkids);
  86       for (i = 0; i < nkids; i++)
  87 /* This prevent us from using gadgets, why is it here? */
  88 /*      if (XtIsWidget (kids [i])) */
  89           {
  90             /* do the kiddies first in case we're destroying */
  91             XtApplyToWidgets (kids [i], proc, arg);
  92             proc (kids [i], arg);
  93           }
  94       free (kids);
  95     }
  96 }
  97
  98
  99 /*
 100  * Apply a function to all the subwidgets of a given widget recursively.
 101  * Stop as soon as the function returns non NULL and returns this as a value.
 102  */
 103 void *
 104 XtApplyUntilToWidgets (w, proc, arg)
 105      Widget w;
 106      XtApplyUntilToWidgetsProc proc;
 107      XtPointer arg;
 108 {
 109   void* result;
 110   if (XtIsComposite (w))
 111     {
 112       CompositeWidget cw = (CompositeWidget)w;
 113       int i;
 114       for (i = 0; i < cw->composite.num_children; i++)
 115         if (XtIsWidget (cw->composite.children [i])){
 116           result = proc (cw->composite.children [i], arg);
 117           if (result)
 118             return result;
 119           result = XtApplyUntilToWidgets (cw->composite.children [i], proc,
 120                                           arg);
 121           if (result)
 122             return result;
 123         }
 124     }
 125   return NULL;
 126 }
 127
 128
 129 /*
 130  * Returns a copy of the list of all children of a composite widget
 131  */
 132 Widget *
 133 XtCompositeChildren (widget, number)
 134      Widget widget;
 135      unsigned int* number;
 136 {
 137   CompositeWidget cw = (CompositeWidget)widget;
 138   Widget* result;
 139   int n;
 140   int i;
 141
 142   if (!XtIsComposite (widget))
 143     {
 144       *number = 0;
 145       return NULL;
 146     }
 147   n = cw->composite.num_children;
 148   result = (Widget*)XtMalloc (n * sizeof (Widget));
 149   *number = n;
 150   for (i = 0; i < n; i++)
 151     result [i] = cw->composite.children [i];
 152   return result;
 153 }
 154
 155 Boolean
 156 XtWidgetBeingDestroyedP (widget)
 157      Widget widget;
 158 {
 159   return widget->core.being_destroyed;
 160 }
 161
 162 void
 163 XtSafelyDestroyWidget (widget)
 164      Widget widget;
 165 {
 166 #if 0
 167
 168   /* this requires IntrinsicI.h (actually, InitialI.h) */
 169
 170   XtAppContext app = XtWidgetToApplicationContext(widget);
 171
 172   if (app->dispatch_level == 0)
 173     {
 174       app->dispatch_level = 1;
 175       XtDestroyWidget (widget);
 176       /* generates an event so that the event loop will be called */
 177       XChangeProperty (XtDisplay (widget), XtWindow (widget),
 178                        XA_STRING, XA_STRING, 32, PropModeAppend, NULL, 0);
 179       app->dispatch_level = 0;
 180     }
 181   else
 182     XtDestroyWidget (widget);
 183
 184 #else
 185   abort ();
 186 #endif
 187 }
 188
 189 /* arch-tag: f21f0a1f-2a4e-44e1-8715-7f234fe2d159
 190    (do not change this comment) */