vcl/unx/generic/app/i18n_xkb.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <iostream>
  23
  24 #include <sal/log.hxx>
  25
  26 #include <X11/Xlib.h>
  27 #include <X11/XKBlib.h>
  28
  29 #include <unx/i18n_xkb.hxx>
  30
  31 SalI18N_KeyboardExtension::SalI18N_KeyboardExtension( Display* pDisplay )
  32     : mbUseExtension(true)
  33     , mnEventBase(0)
  34 {
  35     // allow user to set the default keyboard group idx or to disable the usage
  36     // of x keyboard extension at all:
  37     //      setenv SAL_XKEYBOARDGROUP       disables keyboard extension
  38     //      setenv SAL_XKEYBOARDGROUP 2     sets the keyboard group index to 2
  39     // keyboard group index must be in [1,4], may be specified in hex or decimal
  40     static char *pUseKeyboardExtension = getenv( "SAL_XKEYBOARDGROUP" );
  41     if ( pUseKeyboardExtension != nullptr )
  42     {
  43         mbUseExtension = pUseKeyboardExtension[0] != '\0' ;
  44     }
  45
  46     // query XServer support for XKB Extension,
  47     // do not call XQueryExtension() / XInitExtension() due to possible version
  48     // clashes !
  49     if ( mbUseExtension )
  50     {
  51         int nMajorExtOpcode;
  52         int nExtMajorVersion = XkbMajorVersion;
  53         int nExtMinorVersion = XkbMinorVersion;
  54         int nErrorBase = 0;
  55
  56         mbUseExtension = XkbQueryExtension( pDisplay,
  57             &nMajorExtOpcode, &mnEventBase, &nErrorBase,
  58             &nExtMajorVersion, &nExtMinorVersion ) != 0;
  59     }
  60
  61     // query notification for changes of the keyboard group
  62     if ( mbUseExtension )
  63     {
  64         constexpr auto XkbGroupMask = XkbGroupStateMask | XkbGroupBaseMask
  65                                 | XkbGroupLatchMask | XkbGroupLockMask;
  66
  67         mbUseExtension = XkbSelectEventDetails( pDisplay,
  68             XkbUseCoreKbd, XkbStateNotify, XkbGroupMask, XkbGroupMask );
  69     }
  70
  71     // query initial keyboard group
  72     if ( mbUseExtension )
  73     {
  74         XkbStateRec aStateRecord;
  75         XkbGetState( pDisplay, XkbUseCoreKbd, &aStateRecord );
  76     }
  77 }
  78
  79 void
  80 SalI18N_KeyboardExtension::Dispatch( XEvent* pEvent )
  81 {
  82     // must the event be handled?
  83     if (   !mbUseExtension
  84         || (pEvent->type != mnEventBase) )
  85         return;
  86
  87     // only handle state notify events for now, and only interested
  88     // in group details
  89     sal_uInt32 nXKBType = reinterpret_cast<XkbAnyEvent*>(pEvent)->xkb_type;
  90     switch ( nXKBType )
  91     {
  92         case XkbStateNotify:
  93             break;
  94
  95         default:
  96 #if OSL_DEBUG_LEVEL > 1
  97             SAL_WARN("vcl.app", "Got unrequested XkbAnyEvent "
  98                     << std::hex << std::showbase
  99                     << static_cast<unsigned int>(nXKBType)
 100                     << "/" << std::dec
 101                     << static_cast<int>(nXKBType));
 102 #endif
 103             break;
 104     }
 105 }
 106
 107 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */