text: /*
    ==============================================================================
  
     This file is part of the JUCE library.
     Copyright (c) 2020 - Raw Material Software Limited
  
     JUCE is an open source library subject to commercial or open-source
     licensing.
  
     The code included in this file is provided under the terms of the ISC license
     http://www.isc.org/downloads/software-support-policy/isc-license. Permission
     To use, copy, modify, and/or distribute this software for any purpose with or
     without fee is hereby granted provided that the above copyright notice and
     this permission notice appear in all copies.
  
     JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
     EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
     DISCLAIMED.
  
    ==============================================================================
  */
  
  namespace juce
  {
  
  class ChangeBroadcaster;
  
  //==============================================================================
  /**
      Receives change event callbacks that are sent out by a ChangeBroadcaster.
  
      A ChangeBroadcaster keeps a set of listeners to which it broadcasts a message when
      the ChangeBroadcaster::sendChangeMessage() method is called. A subclass of
      ChangeListener is used to receive these callbacks.
  
      Note that the major difference between an ActionListener and a ChangeListener
      is that for a ChangeListener, multiple changes will be coalesced into fewer
      callbacks, but ActionListeners perform one callback for every event posted.
  
      @see ChangeBroadcaster, ActionListener
  
      @tags{Events}
  */
  class JUCE_API  ChangeListener
  {
  public:
      /** Destructor. */
      virtual ~ChangeListener() = default;
  
      /** Your subclass should implement this method to receive the callback.
          @param source the ChangeBroadcaster that triggered the callback.
      */
      virtual void changeListenerCallback (ChangeBroadcaster* source) = 0;
  };
  
  } // namespace juce
  