libreoffice/svtools/source/control/asynclink.cxx

/* -*- 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 <svtools/asynclink.hxx>
#include <osl/mutex.hxx>
#include <tools/debug.hxx>
#include <vcl/timer.hxx>
#include <vcl/idle.hxx>
#include <vcl/svapp.hxx>


namespace svtools {

void AsynchronLink::CreateMutex()
{
    if( !_pMutex ) _pMutex = new osl::Mutex;
}

void AsynchronLink::Call( void* pObj, bool bAllowDoubles )
{
    SAL_INFO_IF( !_bInCall, "svtools", "Recursives Call. Eher ueber Timer. TLX Fragen" ); // Do NOT translate. This is a valuable historical artefact.
    if( _aLink.IsSet() )
    {
        _pArg = pObj;
        DBG_ASSERT( bAllowDoubles ||
                    ( !_nEventId && ( !_pIdle || !_pIdle->IsActive() ) ),
                    "Already made a call" );
        ClearPendingCall();
        if( _pMutex ) _pMutex->acquire();
        _nEventId = Application::PostUserEvent( LINK( this, AsynchronLink, HandleCall_PostUserEvent) );
        if( _pMutex ) _pMutex->release();
    }
}

AsynchronLink::~AsynchronLink()
{
    if( _nEventId )
    {
        Application::RemoveUserEvent( _nEventId );
    }
    delete _pIdle;
    if( _pDeleted ) *_pDeleted = true;
    delete _pMutex;
}

IMPL_LINK_NOARG( AsynchronLink, HandleCall_Idle, Timer*, void )
{
    if( _pMutex ) _pMutex->acquire();
    _nEventId = nullptr;
    if( _pMutex ) _pMutex->release();
    Call_Impl( _pArg );
}

IMPL_LINK_NOARG( AsynchronLink, HandleCall_PostUserEvent, void*, void )
{
    HandleCall_Idle(nullptr);
}

void AsynchronLink::ClearPendingCall()
{
    if( _pMutex ) _pMutex->acquire();
    if( _nEventId )
    {
        Application::RemoveUserEvent( _nEventId );
        _nEventId = nullptr;
    }
    if( _pMutex ) _pMutex->release();
    if( _pIdle ) _pIdle->Stop();
}

void AsynchronLink::Call_Impl( void* pArg )
{
    _bInCall = true;
    bool bDeleted = false;
    _pDeleted = &bDeleted;
    _aLink.Call( pArg );
    if( !bDeleted )
    {
        _bInCall = false;
        _pDeleted = nullptr;
    }
}

}

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