juce_MidiKeyboardState.h

/*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - 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 JUCE_API  MidiKeyboardState
{
public:
    //==============================================================================
    MidiKeyboardState();
 
    //==============================================================================
    void reset();

    bool isNoteOn (int midiChannel, int midiNoteNumber) const noexcept;

    bool isNoteOnForChannels (int midiChannelMask, int midiNoteNumber) const noexcept;

    void noteOn (int midiChannel, int midiNoteNumber, float velocity);

    void noteOff (int midiChannel, int midiNoteNumber, float velocity);

    void allNotesOff (int midiChannel);
 
    //==============================================================================
    void processNextMidiEvent (const MidiMessage& message);

    void processNextMidiBuffer (MidiBuffer& buffer,
                                int startSample,
                                int numSamples,
                                bool injectIndirectEvents);
 
    //==============================================================================
    class JUCE_API Listener
    {
    public:
        //==============================================================================
        virtual ~Listener() = default;
 
        //==============================================================================
        virtual void handleNoteOn (MidiKeyboardState* source,
                                   int midiChannel, int midiNoteNumber, float velocity) = 0;

        virtual void handleNoteOff (MidiKeyboardState* source,
                                    int midiChannel, int midiNoteNumber, float velocity) = 0;
    };

    void addListener (Listener* listener);

    void removeListener (Listener* listener);
 
private:
    //==============================================================================
    CriticalSection lock;
    std::atomic<uint16> noteStates[128];
    MidiBuffer eventsToAdd;
    ListenerList<Listener> listeners;
 
    void noteOnInternal  (int midiChannel, int midiNoteNumber, float velocity);
    void noteOffInternal (int midiChannel, int midiNoteNumber, float velocity);
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MidiKeyboardState)
};
 
using MidiKeyboardStateListener = MidiKeyboardState::Listener;
 
} // namespace juce