/* -*- 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 .
 */

#ifndef INCLUDED_COMPHELPER_ACCESSIBLEEVENTNOTIFIER_HXX
#define INCLUDED_COMPHELPER_ACCESSIBLEEVENTNOTIFIER_HXX

#include <comphelper/comphelperdllapi.h>

namespace com::sun::star::uno { class XInterface; }
namespace com::sun::star::uno { template <class interface_type> class Reference; }
namespace com::sun::star::accessibility { class XAccessibleEventListener; }
namespace com::sun::star::accessibility { struct AccessibleEventObject; }

namespace comphelper {

class COMPHELPER_DLLPUBLIC AccessibleEventNotifier
{
public:
    typedef sal_uInt32 TClientId;

public:
    AccessibleEventNotifier() = delete;
    ~AccessibleEventNotifier() = delete;
    AccessibleEventNotifier( const AccessibleEventNotifier& ) = delete;
    AccessibleEventNotifier& operator=( const AccessibleEventNotifier& ) = delete;

    /** registers a client of this class, means a broadcaster of AccessibleEvents

        <p>No precaution is taken to care for disposal of this component. When the component
        dies, it <b>must</b> call <member>revokeClient</member> or <member>revokeClientNotifyDisposing</member>
        explicitly itself.</p>
    */
    static TClientId registerClient();

    /** revokes a broadcaster of AccessibleEvents

        <p>Note that no disposing event is fired when you use this method, the client is simply revoked.
        You can for instance revoke a client if the last listener for it is revoked, but the client
        itself is not disposed.<br/>
        When the client is disposed, you should prefer <member>revokeClientNotifyDisposing</member></p>

        <p>Any possibly pending events for this client are removed from the queue.</p>

        @seealso revokeClientNotifyDisposing
    */
    static void revokeClient( const TClientId _nClient );

    /** revokes a client, with additionally notifying a disposing event to all listeners registered for
        this client

        <p>Any other possibly pending events for this client are removed from the queue</p>

        @param _nClient
            the id of the client which should be revoked
        @param _rxEventSource
            the source to be notified together with the <member scope="com.sun.star.lang">XComponent::disposing</member>
            call.
    */
    static void revokeClientNotifyDisposing(
        const TClientId _nClient,
        const css::uno::Reference< css::uno::XInterface >& _rxEventSource );

    /** registers a listener for the given client

        @param _nClient
            the id of the client for which a listener should be registered
        @return
            the number of event listeners currently registered for this client
    */
    static sal_Int32 addEventListener(
        const TClientId _nClient,
        const css::uno::Reference< css::accessibility::XAccessibleEventListener >& _rxListener );

    /** revokes a listener for the given client

        @param _nClient
            the id of the client for which a listener should be revoked
        @return
            the number of event listeners currently registered for this client
    */
    static sal_Int32 removeEventListener(
        const TClientId _nClient,
        const css::uno::Reference< css::accessibility::XAccessibleEventListener >& _rxListener );

    /** adds an event, which is to be broadcasted, to the queue

        @param _nClient
            the id of the client which needs to broadcast the event
    */
    static void addEvent(
        const TClientId _nClient,
        const css::accessibility::AccessibleEventObject& _rEvent );

    // to be called at application shutdown to clear the static map, so we don't get crashes on shutdown
    static void shutdown();

};

}   // namespace comphelper

#endif // INCLUDED_COMPHELPER_ACCESSIBLEEVENTNOTIFIER_HXX

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