svl/source/notify/lstner.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
  21 #include <tools/debug.hxx>
  22
  23 #include <svl/hint.hxx>
  24 #include <svl/brdcst.hxx>
  25
  26 #include <svl/lstner.hxx>
  27 #include <algorithm>
  28
  29 DBG_NAME(SfxListener)
  30 TYPEINIT0(SfxListener);
  31
  32 // simple ctor of class SfxListener
  33
  34 SfxListener::SfxListener()
  35 {
  36     DBG_CTOR(SfxListener, 0);
  37 }
  38
  39 // copy ctor of class SfxListener
  40
  41 SfxListener::SfxListener( const SfxListener &rListener )
  42 {
  43     DBG_CTOR(SfxListener, 0);
  44
  45     for ( sal_uInt16 n = 0; n < rListener.aBCs.size(); ++n )
  46         StartListening( *rListener.aBCs[n] );
  47 }
  48
  49 // unregisters the SfxListener from its SfxBroadcasters
  50
  51 SfxListener::~SfxListener()
  52 {
  53     DBG_DTOR(SfxListener, 0);
  54
  55     // unregister at all remaining broadcasters
  56     for ( sal_uInt16 nPos = 0; nPos < aBCs.size(); ++nPos )
  57     {
  58         SfxBroadcaster *pBC = aBCs[nPos];
  59         pBC->RemoveListener(*this);
  60     }
  61 }
  62
  63
  64 // unregisters a specific SfxBroadcaster
  65
  66 void SfxListener::RemoveBroadcaster_Impl( SfxBroadcaster& rBroadcaster )
  67 {
  68     DBG_CHKTHIS(SfxListener, 0);
  69
  70     aBCs.erase( std::find( aBCs.begin(), aBCs.end(), &rBroadcaster ) );
  71 }
  72
  73
  74 // registers a specific SfxBroadcaster
  75
  76 sal_Bool SfxListener::StartListening( SfxBroadcaster& rBroadcaster, sal_Bool bPreventDups )
  77 {
  78     DBG_CHKTHIS(SfxListener, 0);
  79
  80     if ( !bPreventDups || !IsListening( rBroadcaster ) )
  81     {
  82         rBroadcaster.AddListener(*this);
  83         aBCs.push_back( &rBroadcaster );
  84
  85         DBG_ASSERT( IsListening(rBroadcaster), "StartListening failed" );
  86         return sal_True;
  87     }
  88
  89     return sal_False;
  90 }
  91
  92
  93 // unregisters a specific SfxBroadcaster
  94
  95 sal_Bool SfxListener::EndListening( SfxBroadcaster& rBroadcaster, sal_Bool bAllDups )
  96 {
  97     DBG_CHKTHIS(SfxListener, 0);
  98
  99     if ( !IsListening( rBroadcaster ) )
 100         return sal_False;
 101
 102     do
 103     {
 104         rBroadcaster.RemoveListener(*this);
 105         aBCs.erase( std::find( aBCs.begin(), aBCs.end(), &rBroadcaster ) );
 106     }
 107     while ( bAllDups && IsListening( rBroadcaster ) );
 108     return sal_True;
 109 }
 110
 111
 112 // unregisters all Broadcasters
 113
 114 void SfxListener::EndListeningAll()
 115 {
 116     DBG_CHKTHIS(SfxListener, 0);
 117
 118     // MI: bei Optimierung beachten: Seiteneffekte von RemoveListener beachten!
 119     while ( !aBCs.empty() )
 120     {
 121         SfxBroadcaster *pBC = aBCs.front();
 122         pBC->RemoveListener(*this);
 123         aBCs.pop_front();
 124     }
 125 }
 126
 127
 128 sal_Bool SfxListener::IsListening( SfxBroadcaster& rBroadcaster ) const
 129 {
 130     return aBCs.end() != std::find( aBCs.begin(), aBCs.end(), &rBroadcaster );
 131 }
 132
 133
 134 // base implementation of notification handler
 135
 136 #ifdef DBG_UTIL
 137 void SfxListener::Notify( SfxBroadcaster& rBroadcaster, const SfxHint& )
 138 #else
 139 void SfxListener::Notify( SfxBroadcaster&, const SfxHint& )
 140 #endif
 141 {
 142     #ifdef DBG_UTIL
 143     DBG_ASSERT(aBCs.end() != std::find(aBCs.begin(), aBCs.end(), &rBroadcaster),
 144                 "notification from unregistered broadcaster" );
 145     #endif
 146 }
 147
 148 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */