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 <stdio.h>
  21
  22 #include "unx/saldisp.hxx"
  23 #include "unx/saldata.hxx"
  24 #include "unx/i18n_xkb.hxx"
  25
  26 SalI18N_KeyboardExtension::SalI18N_KeyboardExtension( Display* pDisplay )
  27     : mbUseExtension(true)
  28     , mnDefaultGroup(0)
  29     , mnGroup(0)
  30     , mnEventBase(0)
  31     , mnErrorBase(0)
  32     , mpDisplay(pDisplay)
  33 {
  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 != NULL )
  42     {
  43         mbUseExtension = pUseKeyboardExtension[0] != '\0' ;
  44         if ( mbUseExtension )
  45             mnDefaultGroup = strtol( pUseKeyboardExtension, NULL, 0 );
  46         if ( mnDefaultGroup > XkbMaxKbdGroup )
  47             mnDefaultGroup = 0;
  48     }
  49
  50     // query XServer support for XKB Extension,
  51     // do not call XQueryExtension() / XInitExtension() due to possible version
  52     // clashes !
  53     if ( mbUseExtension )
  54     {
  55         int nMajorExtOpcode;
  56         int nExtMajorVersion = XkbMajorVersion;
  57         int nExtMinorVersion = XkbMinorVersion;
  58
  59         mbUseExtension = XkbQueryExtension( mpDisplay,
  60             &nMajorExtOpcode, &mnEventBase, &mnErrorBase,
  61             &nExtMajorVersion, &nExtMinorVersion ) != 0;
  62     }
  63
  64     // query notification for changes of the keyboard group
  65     if ( mbUseExtension )
  66     {
  67         #define XkbGroupMask (  XkbGroupStateMask | XkbGroupBaseMask \
  68                                 | XkbGroupLatchMask | XkbGroupLockMask )
  69
  70         mbUseExtension = XkbSelectEventDetails( mpDisplay,
  71             XkbUseCoreKbd, XkbStateNotify, XkbGroupMask, XkbGroupMask );
  72     }
  73
  74     // query initial keyboard group
  75     if ( mbUseExtension )
  76     {
  77         XkbStateRec aStateRecord;
  78         XkbGetState( mpDisplay, XkbUseCoreKbd, &aStateRecord );
  79         mnGroup = aStateRecord.group;
  80     }
  81 }
  82
  83 void
  84 SalI18N_KeyboardExtension::Dispatch( XEvent* pEvent )
  85 {
  86     // must the event be handled?
  87     if (   !mbUseExtension
  88         || (pEvent->type != mnEventBase) )
  89         return;
  90
  91     // only handle state notify events for now, and only interested
  92     // in group details
  93     sal_uInt32 nXKBType = reinterpret_cast<XkbAnyEvent*>(pEvent)->xkb_type;
  94     switch ( nXKBType )
  95     {
  96         case XkbStateNotify:
  97
  98             mnGroup = reinterpret_cast<XkbStateNotifyEvent*>(pEvent)->group;
  99             break;
 100
 101         default:
 102
 103             #if OSL_DEBUG_LEVEL > 1
 104             fprintf(stderr, "Got unrequested XkbAnyEvent %#x/%i\n",
 105                     static_cast<unsigned int>(nXKBType), static_cast<int>(nXKBType) );
 106             #endif
 107             break;
 108     }
 109 }
 110
 111 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */