JUCE/examples/ExpressiveMidiTest/Source/MainComponent.h

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

   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 MAINCOMPONENT_H_INCLUDED
#define MAINCOMPONENT_H_INCLUDED

//==============================================================================
class MainComponent : public Component,
                      private AudioIODeviceCallback,
                      private MidiInputCallback,
                      private ZoneLayoutComponent::Listener
{
public:
    //==========================================================================
    MainComponent()
        : audioSetupComp (audioDeviceManager, 0, 0, 0, 256, true, true, true, false)
    {
        setLookAndFeel (&lookAndFeel);
        setSize (880, 670);
        audioDeviceManager.initialise (0, 2, 0, true, String::empty, 0);
        audioDeviceManager.addMidiInputCallback(String::empty, this);
        audioDeviceManager.addAudioCallback (this);

        addAndMakeVisible (audioSetupComp);
        addAndMakeVisible (expressiveMidiSetupComp);
        addAndMakeVisible (zoneLayoutComp);
        addAndMakeVisible (visualiserViewport);

        visualiserViewport.setScrollBarsShown (false, true);
        visualiserViewport.setViewedComponent (&visualiserComp, false);
        visualiserViewport.setViewPositionProportionately (0.5, 0.0);

        expressiveMidiSetupComp.addListener (&zoneLayoutComp);
        expressiveMidiSetupComp.addListener (this);
        visualiserInstrument.addListener (&visualiserComp);
    }

    ~MainComponent()
    {
        audioDeviceManager.removeMidiInputCallback (String::empty, this);
    }

    //==========================================================================
    void resized() override
    {
        const int visualiserCompWidth = 2800;
        const int visualiserCompHeight = 300;
        const int zoneLayoutCompHeight = 60;
        const float audioSetupCompRelativeWidth = 0.6f;

        Rectangle<int> r (getLocalBounds());

        visualiserViewport.setBounds (r.removeFromBottom (visualiserCompHeight));
        visualiserComp.setBounds (Rectangle<int> (visualiserCompWidth,
                                                  visualiserViewport.getHeight() - visualiserViewport.getScrollBarThickness()));

        zoneLayoutComp.setBounds (r.removeFromBottom (zoneLayoutCompHeight));
        audioSetupComp.setBounds (r.removeFromLeft (proportionOfWidth (audioSetupCompRelativeWidth)));
        expressiveMidiSetupComp.setBounds (r);
    }

    //==========================================================================
    void audioDeviceIOCallback (const float** inputChannelData, int numInputChannels,
                                float** outputChannelData, int numOutputChannels,
                                int numSamples) override
    {
        AudioBuffer<float> buffer (outputChannelData, numOutputChannels, numSamples);
        buffer.clear();

        MidiBuffer incomingMidi;
        midiCollector.removeNextBlockOfMessages (incomingMidi, numSamples);
        synth.renderNextBlock (buffer, incomingMidi, 0, numSamples);
    }

    void audioDeviceAboutToStart (AudioIODevice* device) override
    {
        const double sampleRate = device->getCurrentSampleRate();
        midiCollector.reset (sampleRate);
        synth.setCurrentPlaybackSampleRate (sampleRate);
    }

    void audioDeviceStopped() override
    {
    }

private:
    //==========================================================================
    void handleIncomingMidiMessage (MidiInput* /*source*/,
                                    const MidiMessage& message) override
    {
        visualiserInstrument.processNextMidiEvent (message);
        midiCollector.addMessageToQueue (message);
    }

    //==========================================================================
    void expressiveMidiZoneLayoutChanged (ExpressiveMidiZoneLayout newLayout) override
    {
        MidiOutput* midiOutput = audioDeviceManager.getDefaultMidiOutput();
        if (midiOutput != nullptr)
            midiOutput->sendBlockOfMessagesNow (ExpressiveMidiMessages::setZoneLayout (newLayout));

        visualiserInstrument.setZoneLayout (newLayout);
        synth.setZoneLayout (newLayout);
    }

    //==========================================================================
    LookAndFeel_V3 lookAndFeel;
    AudioDeviceManager audioDeviceManager;
    AudioDeviceSelectorComponent audioSetupComp;
    ExpressiveMidiSetupComponent expressiveMidiSetupComp;
    ZoneLayoutComponent zoneLayoutComp;

    Visualiser visualiserComp;
    Viewport visualiserViewport;
    ExpressiveMidiInstrument visualiserInstrument;

    DemoSynth synth;
    MidiMessageCollector midiCollector;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MainComponent)
};


#endif  // MAINCOMPONENT_H_INCLUDED