svl/source/notify/brdcst.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 <assert.h>
  21
  22 #include <tools/debug.hxx>
  23
  24 #include <svl/hint.hxx>
  25 #include <svl/smplhint.hxx>
  26 #include <svl/lstner.hxx>
  27
  28 #include <svl/brdcst.hxx>
  29 #include <algorithm>
  30
  31 DBG_NAME(SfxBroadcaster)
  32 TYPEINIT0(SfxBroadcaster);
  33
  34
  35 // broadcast immediately
  36
  37 void SfxBroadcaster::Broadcast( const SfxHint &rHint )
  38 {
  39     DBG_CHKTHIS(SfxBroadcaster, 0);
  40
  41     // notify all registered listeners exactly once
  42     for (size_t n = 0; n < m_Listeners.size(); ++n)
  43     {
  44         SfxListener *const pListener = m_Listeners[n];
  45         if (pListener) {
  46             pListener->Notify( *this, rHint );
  47         }
  48     }
  49 }
  50
  51 // unregister all listeners
  52
  53 SfxBroadcaster::~SfxBroadcaster()
  54 {
  55     DBG_DTOR(SfxBroadcaster, 0);
  56
  57     Broadcast( SfxSimpleHint(SFX_HINT_DYING) );
  58
  59     // remove all still registered listeners
  60     for (size_t nPos = 0; nPos < m_Listeners.size(); ++nPos)
  61     {
  62         SfxListener *const pListener = m_Listeners[nPos];
  63         if (pListener) {
  64             pListener->RemoveBroadcaster_Impl(*this);
  65         }
  66     }
  67 }
  68
  69
  70 // simple ctor of class SfxBroadcaster
  71
  72 SfxBroadcaster::SfxBroadcaster()
  73 {
  74     DBG_CTOR(SfxBroadcaster, 0);
  75 }
  76
  77
  78 // copy ctor of class SfxBroadcaster
  79
  80
  81 SfxBroadcaster::SfxBroadcaster( const SfxBroadcaster &rBC )
  82 {
  83     DBG_CTOR(SfxBroadcaster, 0);
  84
  85     for (size_t n = 0; n < rBC.m_Listeners.size(); ++n)
  86     {
  87         SfxListener *const pListener = rBC.m_Listeners[n];
  88         if (pListener) {
  89             pListener->StartListening( *this );
  90         }
  91     }
  92 }
  93
  94
  95 // add a new SfxListener to the list
  96
  97 void SfxBroadcaster::AddListener( SfxListener& rListener )
  98 {
  99     DBG_CHKTHIS(SfxBroadcaster, 0);
 100
 101     for (size_t i = 0; i < m_Listeners.size(); ++i)
 102     {
 103         if (!m_Listeners[i]) // removed by RemoveListener?
 104         {
 105             m_Listeners[i] = &rListener;
 106             return;
 107         }
 108     }
 109     m_Listeners.push_back(&rListener);
 110 }
 111
 112
 113 // called, if no more listeners exists
 114
 115 void SfxBroadcaster::ListenersGone()
 116 {
 117     DBG_CHKTHIS(SfxBroadcaster,0);
 118 }
 119
 120
 121 // forward a notification to all registered listeners
 122
 123 void SfxBroadcaster::Forward(SfxBroadcaster& rBC, const SfxHint& rHint)
 124 {
 125     for (size_t i = 0; i < m_Listeners.size(); ++i)
 126     {
 127         SfxListener *const pListener = m_Listeners[i];
 128         if (pListener) {
 129             pListener->Notify( rBC, rHint );
 130         }
 131     }
 132 }
 133
 134
 135 // remove one SfxListener from the list
 136
 137 void SfxBroadcaster::RemoveListener( SfxListener& rListener )
 138 {
 139     {DBG_CHKTHIS(SfxBroadcaster, 0);}
 140     SfxListenerArr_Impl::iterator aIter = std::find(
 141             m_Listeners.begin(), m_Listeners.end(), &rListener);
 142     assert(aIter != m_Listeners.end()); // "RemoveListener: Listener unknown"
 143     // DO NOT erase the listener, set the pointer to 0
 144     // because the current continuation may contain this->Broadcast
 145     *aIter = 0;
 146
 147     if ( !HasListeners() )
 148         ListenersGone();
 149 }
 150
 151 bool SfxBroadcaster::HasListeners() const
 152 {
 153     for (size_t i = 0; i < m_Listeners.size(); ++i)
 154     {
 155         if (m_Listeners[i]) {
 156             return true;
 157         }
 158     }
 159     return false;
 160 }
 161
 162 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */