JUCE/modules/juce_blocks_basics/topology/juce_TopologySource.h

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2016 - ROLI Ltd.

   Permission is granted to use this software 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
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   -----------------------------------------------------------------------------

   To release a closed-source product which uses other parts of JUCE not
   licensed under the ISC terms, commercial licenses are available: visit
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  ==============================================================================
*/


/** Base class for an entity that provides access to a blocks topology. */
class TopologySource
{
public:
    //==========================================================================
    /** Destructor. */
    virtual ~TopologySource() {}

    /** Returns the current topology that this object manages. */
    virtual BlockTopology getCurrentTopology() const = 0;

    //==========================================================================
    struct Listener
    {
        virtual ~Listener() {}
        virtual void topologyChanged() = 0;
    };

    void addListener (Listener* l)       { listeners.add (l); }
    void removeListener (Listener* l)    { listeners.remove (l); }

    /** Invoke this to force touches-off on all physical devices. */
    virtual void cancelAllActiveTouches() noexcept {}

protected:
    //==========================================================================
    juce::ListenerList<Listener> listeners;
};