juce_ChangeBroadcaster.h

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/*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.
 
   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3
 
   Details of these licenses can be found at: www.gnu.org/licenses
 
   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
 
   ------------------------------------------------------------------------------
 
   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.
 
  ==============================================================================
*/
 
#ifndef JUCE_CHANGEBROADCASTER_H_INCLUDED
#define JUCE_CHANGEBROADCASTER_H_INCLUDED
 
 
//==============================================================================
class JUCE_API  ChangeBroadcaster
{
public:
    //==============================================================================
    ChangeBroadcaster() noexcept;
 
    virtual ~ChangeBroadcaster();
 
    //==============================================================================
    void addChangeListener (ChangeListener* listener);
 
    void removeChangeListener (ChangeListener* listener);
 
    void removeAllChangeListeners();
 
    //==============================================================================
    void sendChangeMessage();
 
    void sendSynchronousChangeMessage();
 
    void dispatchPendingMessages();
 
private:
    //==============================================================================
    class ChangeBroadcasterCallback  : public AsyncUpdater
    {
    public:
        ChangeBroadcasterCallback();
        void handleAsyncUpdate() override;
 
        ChangeBroadcaster* owner;
    };
 
    friend class ChangeBroadcasterCallback;
    ChangeBroadcasterCallback callback;
    ListenerList <ChangeListener> changeListeners;
 
    void callListeners();
 
    JUCE_DECLARE_NON_COPYABLE (ChangeBroadcaster)
};
 
 
#endif   // JUCE_CHANGEBROADCASTER_H_INCLUDED