/* -*- 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 <ModifyListenerCallBack.hxx>
#include <comphelper/compbase.hxx>

using namespace ::com::sun::star;
using ::com::sun::star::uno::Reference;

namespace chart {

typedef comphelper::WeakComponentImplHelper< css::util::XModifyListener >
    ModifyListenerCallBack_Base;

class ModifyListenerCallBack_impl
    : public ModifyListenerCallBack_Base
{
public:
    explicit ModifyListenerCallBack_impl( const Link<void*,void>& rCallBack );

    void startListening( const Reference< util::XModifyBroadcaster >& xBroadcaster );
    void stopListening();

    //XModifyListener
    virtual void SAL_CALL modified( const lang::EventObject& aEvent ) override;

    //XEventListener
    virtual void SAL_CALL disposing( const lang::EventObject& Source ) override;

    using ::comphelper::WeakComponentImplHelperBase::disposing;

private:
    Link<void*,void> m_aLink;//will be called on modify
    Reference< util::XModifyBroadcaster > m_xBroadcaster;//broadcaster to listen at
};

ModifyListenerCallBack_impl::ModifyListenerCallBack_impl( const Link<void*,void>& rCallBack )
                        : m_aLink( rCallBack )
{
}

//XModifyListener
void SAL_CALL ModifyListenerCallBack_impl::modified( const lang::EventObject& /*aEvent*/ )
{
    m_aLink.Call(nullptr);
}

//XEventListener
void SAL_CALL ModifyListenerCallBack_impl::disposing( const lang::EventObject& /*Source*/ )
{
    m_xBroadcaster.clear();
}

void ModifyListenerCallBack_impl::startListening( const ::com::sun::star::uno::Reference< ::com::sun::star::util::XModifyBroadcaster >& xBroadcaster )
{
    if( m_xBroadcaster == xBroadcaster )
        return;

    stopListening();
    m_xBroadcaster = xBroadcaster;
    if( m_xBroadcaster.is() )
        m_xBroadcaster->addModifyListener( this );
}
void ModifyListenerCallBack_impl::stopListening()
{
    if( m_xBroadcaster.is() )
    {
        m_xBroadcaster->removeModifyListener( this );
        m_xBroadcaster.clear();
    }
}

ModifyListenerCallBack::ModifyListenerCallBack( const Link<void*,void>& rCallBack )
                        : pModifyListener_impl( new ModifyListenerCallBack_impl(rCallBack) )
                        , m_xModifyListener( pModifyListener_impl )
{
}

ModifyListenerCallBack::~ModifyListenerCallBack()
{
    stopListening();
}

void ModifyListenerCallBack::startListening( const ::com::sun::star::uno::Reference< ::com::sun::star::util::XModifyBroadcaster >& xBroadcaster )
{
    pModifyListener_impl->startListening( xBroadcaster );
}
void ModifyListenerCallBack::stopListening()
{
    pModifyListener_impl->stopListening();
}

} // namespace chart

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