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       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             : #ifndef INCLUDED_UNOTOOLS_OPTIONS_HXX
      21             : #define INCLUDED_UNOTOOLS_OPTIONS_HXX
      22             : 
      23             : #include <sal/config.h>
      24             : #include <unotools/unotoolsdllapi.h>
      25             : #include <vector>
      26             : 
      27             : /*
      28             :     The class utl::detail::Options provides a kind of multiplexer. It implements a ConfigurationListener
      29             :     that is usually registered at a ConfigItem class. At the same time it implements a ConfigurationBroadcaster
      30             :     that allows further ("external") listeners to register.
      31             :     Once the class deriving from Options is notified about
      32             :     configuration changes by the ConfigItem if its content has been changed by calling some of its methods,
      33             :     a call of the Options::NotifyListeners() method will send out notifications to all external listeners.
      34             : */
      35             : 
      36             : namespace utl {
      37             : 
      38             :     class ConfigurationBroadcaster;
      39             : 
      40             :     // interface for configuration listener
      41           0 :     class UNOTOOLS_DLLPUBLIC ConfigurationListener
      42             :     {
      43             :     public:
      44             :         virtual ~ConfigurationListener();
      45             : 
      46             :         virtual void ConfigurationChanged( ConfigurationBroadcaster* p, sal_uInt32 nHint=0 ) = 0;
      47             :     };
      48             :     typedef ::std::vector< ConfigurationListener* > IMPL_ConfigurationListenerList;
      49             : 
      50             :     // complete broadcasting implementation
      51             :     class UNOTOOLS_DLLPUBLIC ConfigurationBroadcaster
      52             :     {
      53             :         IMPL_ConfigurationListenerList* mpList;
      54             :         sal_Int32               m_nBroadcastBlocked;     // broadcast only if this is 0
      55             :         sal_uInt32              m_nBlockedHint;
      56             : 
      57             :     public:
      58             :         void AddListener( utl::ConfigurationListener* pListener );
      59             :         void RemoveListener( utl::ConfigurationListener* pListener );
      60             : 
      61             :         // notify listeners; nHint is an implementation detail of the particular class deriving from ConfigurationBroadcaster
      62             :         void NotifyListeners( sal_uInt32 nHint );
      63             :         ConfigurationBroadcaster();
      64             :         virtual ~ConfigurationBroadcaster();
      65             :         virtual void BlockBroadcasts( bool bBlock );
      66             :     };
      67             : 
      68             : namespace detail {
      69             : 
      70             : // A base class for the various option classes supported by
      71             : // unotools/source/config/itemholderbase.hxx (which must be public, as it is
      72             : // shared between unotools, svl and svt)
      73             : // It also provides an implementation for a Configuration Listener and inherits a broadcaster implementation
      74             : 
      75             : class UNOTOOLS_DLLPUBLIC SAL_WARN_UNUSED Options
      76             :     : public utl::ConfigurationBroadcaster, public utl::ConfigurationListener
      77             : {
      78             : public:
      79             :     Options();
      80             : 
      81             :     virtual ~Options() = 0;
      82             : 
      83             : private:
      84             :     UNOTOOLS_DLLPRIVATE Options(Options &); // not defined
      85             :     UNOTOOLS_DLLPRIVATE void operator =(Options &); // not defined
      86             : 
      87             : protected:
      88             :     virtual void ConfigurationChanged( ::utl::ConfigurationBroadcaster* p, sal_uInt32 nHint=0 ) SAL_OVERRIDE;
      89             : };
      90             : 
      91             : } }
      92             : 
      93             : #endif
      94             : 
      95             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */