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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:06:44 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:06:44 +0000 |
commit | ed5640d8b587fbcfed7dd7967f3de04b37a76f26 (patch) | |
tree | 7a5f7c6c9d02226d7471cb3cc8fbbf631b415303 /svl/source/notify/lstner.cxx | |
parent | Initial commit. (diff) | |
download | libreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.tar.xz libreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.zip |
Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'svl/source/notify/lstner.cxx')
-rw-r--r-- | svl/source/notify/lstner.cxx | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/svl/source/notify/lstner.cxx b/svl/source/notify/lstner.cxx new file mode 100644 index 000000000..40a59960a --- /dev/null +++ b/svl/source/notify/lstner.cxx @@ -0,0 +1,163 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#include <svl/lstner.hxx> + +#include <svl/SfxBroadcaster.hxx> +#include <sal/backtrace.hxx> +#include <sal/log.hxx> + +#include <algorithm> +#include <cassert> +#include <vector> +#include <memory> + +// copy ctor of class SfxListener + +SfxListener::SfxListener( const SfxListener &rOther ) + : maBCs( rOther.maBCs ) +{ + for ( size_t n = 0; n < maBCs.size(); ++n ) + { + maBCs[n]->AddListener(*this); +#ifdef DBG_UTIL + maCallStacks.emplace( maBCs[n], sal::backtrace_get(10) ); +#endif + } +} + +// unregisters the SfxListener from its SfxBroadcasters + +SfxListener::~SfxListener() COVERITY_NOEXCEPT_FALSE +{ + // unregister at all remaining broadcasters + for ( size_t nPos = 0; nPos < maBCs.size(); ++nPos ) + { + SfxBroadcaster *pBC = maBCs[nPos]; + pBC->RemoveListener(*this); + } +} + + +// unregisters a specific SfxBroadcaster + +void SfxListener::RemoveBroadcaster_Impl( SfxBroadcaster& rBroadcaster ) +{ + auto it = std::find( maBCs.begin(), maBCs.end(), &rBroadcaster ); + if (it != maBCs.end()) { + maBCs.erase( it ); +#ifdef DBG_UTIL + maCallStacks.erase( &rBroadcaster ); +#endif + } +} + + + +/** + Registers a specific SfxBroadcaster. + + Some code uses duplicates as a kind of ref-counting thing i.e. they add and remove listeners + on different code paths, and they only really stop listening when the last EndListening() is called. +*/ +void SfxListener::StartListening(SfxBroadcaster& rBroadcaster, DuplicateHandling eDuplicateHanding) +{ + bool bListeningAlready = IsListening( rBroadcaster ); + +#ifdef DBG_UTIL + if (bListeningAlready && eDuplicateHanding == DuplicateHandling::Unexpected) + { + auto f = maCallStacks.find( &rBroadcaster ); + SAL_WARN("svl", "previous StartListening call came from: " << sal::backtrace_to_string(f->second.get())); + } +#endif + assert(!(bListeningAlready && eDuplicateHanding == DuplicateHandling::Unexpected) && "duplicate listener, try building with DBG_UTIL to find the other insert site."); + + if (!bListeningAlready || eDuplicateHanding != DuplicateHandling::Prevent) + { + rBroadcaster.AddListener(*this); + maBCs.push_back( &rBroadcaster ); +#ifdef DBG_UTIL + maCallStacks.emplace( &rBroadcaster, sal::backtrace_get(10) ); +#endif + assert(IsListening(rBroadcaster) && "StartListening failed"); + } +} + +// unregisters a specific SfxBroadcaster + +void SfxListener::EndListening( SfxBroadcaster& rBroadcaster, bool bRemoveAllDuplicates ) +{ + auto beginIt = maBCs.begin(); + do + { + auto it = std::find( beginIt, maBCs.end(), &rBroadcaster ); + if ( it == maBCs.end() ) + { + break; + } + rBroadcaster.RemoveListener(*this); + beginIt = maBCs.erase( it ); +#ifdef DBG_UTIL + maCallStacks.erase( &rBroadcaster ); +#endif + } + while ( bRemoveAllDuplicates ); +} + + +// unregisters all Broadcasters + +void SfxListener::EndListeningAll() +{ + std::vector<SfxBroadcaster*> aBroadcasters; + std::swap(maBCs, aBroadcasters); + for (SfxBroadcaster *pBC : aBroadcasters) + pBC->RemoveListener(*this); +#ifdef DBG_UTIL + maCallStacks.clear(); +#endif +} + + +bool SfxListener::IsListening( SfxBroadcaster& rBroadcaster ) const +{ + return maBCs.end() != std::find( maBCs.begin(), maBCs.end(), &rBroadcaster ); +} + +sal_uInt16 SfxListener::GetBroadcasterCount() const +{ + return maBCs.size(); +} + +SfxBroadcaster* SfxListener::GetBroadcasterJOE( sal_uInt16 nNo ) const +{ + return maBCs[nNo]; +} + + +// base implementation of notification handler + +void SfxListener::Notify( SfxBroadcaster& rBroadcaster, const SfxHint& ) +{ + (void) rBroadcaster; + assert(IsListening(rBroadcaster)); +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |