void
MidiMixerWindow::setupTabs()
{
    DeviceListConstIterator it;
    MidiDevice *dev = 0;
    InstrumentList instruments;
    InstrumentList::const_iterator iIt;
    int faderCount = 0, deviceCount = 1;

    if (m_tabFrame)
        delete m_tabFrame;

    // Setup m_tabFrame
    //

    QWidget *blackWidget = new QWidget(this);
    setCentralWidget(blackWidget);
    QVBoxLayout *centralLayout = new QVBoxLayout;
    blackWidget->setLayout(centralLayout);

    m_tabWidget = new QTabWidget;
    centralLayout->addWidget(m_tabWidget);

    connect(m_tabWidget, SIGNAL(currentChanged(QWidget *)),
            this, SLOT(slotCurrentTabChanged(QWidget *)));
    m_tabWidget->setTabPosition(QTabWidget::South);
    setWindowTitle(tr("MIDI Mixer"));
    setWindowIcon(IconLoader().loadPixmap("window-midimixer"));


    for (it = m_studio->begin(); it != m_studio->end(); ++it) {
        dev = dynamic_cast<MidiDevice*>(*it);

        if (dev) {
            // Get the control parameters that are on the IPB (and hence can
            // be shown here too).
            //
            ControlList controls = getIPBForMidiMixer(dev);

            instruments = dev->getPresentationInstruments();

            // Don't add a frame for empty devices
            //
            if (!instruments.size())
                continue;

            m_tabFrame = new QFrame(m_tabWidget);
            m_tabFrame->setContentsMargins(10, 10, 10, 10);

            // m_tabFrame->setContentsMargins(5, 5, 5, 5); ???
            QGridLayout *mainLayout = new QGridLayout(m_tabFrame);

            // MIDI Mixer label
            QLabel *label = new QLabel("", m_tabFrame);
            mainLayout->addWidget(label, 0, 0, 0, 16, Qt::AlignCenter);

            // control labels
            for (size_t i = 0; i < controls.size(); ++i) {
                label = new QLabel(QObject::tr(controls[i].getName().c_str()), m_tabFrame);
                mainLayout->addWidget(label, i + 1, 0, Qt::AlignCenter);
            }

            // meter label
            // (obsolete abandoned code deleted here)

            // volume label
            label = new QLabel(tr("Volume"), m_tabFrame);
            mainLayout->addWidget(label, controls.size() + 2, 0,
                                  Qt::AlignCenter);

            // instrument label
            label = new QLabel(tr("Instrument"), m_tabFrame);
            label->setFixedWidth(80); //!!! this should come from metrics
            mainLayout->addWidget(label, controls.size() + 3, 0,
                                  Qt::AlignLeft);

            int posCount = 1;
            int firstInstrument = -1;

            for (iIt = instruments.begin(); iIt != instruments.end(); ++iIt) {

                // Add new fader struct
                //
                m_faders.push_back(new FaderStruct());

                // Store the first ID
                //
                if (firstInstrument == -1)
                    firstInstrument = (*iIt)->getId();


                // Add the controls
                //
                for (size_t i = 0; i < controls.size(); ++i) {
                    QColor knobColour = QColor(Qt::white);

                    if (controls[i].getColourIndex() > 0) {
                        Colour c =
                            m_document->getComposition().getGeneralColourMap().
                            getColourByIndex(controls[i].getColourIndex());

                        knobColour = QColor(c.getRed(),
                                            c.getGreen(), c.getBlue());
                    }

                    Rotary *controller =
                        new Rotary(m_tabFrame,
                                   controls[i].getMin(),
                                   controls[i].getMax(),
                                   1.0,
                                   5.0,
                                   controls[i].getDefault(),
                                   20,
                                   Rotary::NoTicks,
                                   false,
                                   controls[i].getDefault() == 64); //!!! hacky

                    controller->setKnobColour(knobColour);

                    connect(controller, SIGNAL(valueChanged(float)),
                            this, SLOT(slotControllerChanged(float)));

                    mainLayout->addWidget(controller, i + 1, posCount,
                                          Qt::AlignCenter);

                    // Store the rotary
                    //
                    m_faders[faderCount]->m_controllerRotaries.push_back(
                        std::pair<MidiByte, Rotary*>
                        (controls[i].getControllerValue(), controller));
                }

                // VU meter
                //
                MidiMixerVUMeter *meter =
                    new MidiMixerVUMeter(m_tabFrame,
                                         VUMeter::FixedHeightVisiblePeakHold, 6, 30);
                mainLayout->addWidget(meter, controls.size() + 1,
                                      posCount, Qt::AlignCenter);
                m_faders[faderCount]->m_vuMeter = meter;

                // Volume fader
                //
                Fader *fader =
                    new Fader(0, 127, 100, 20, 80, m_tabFrame);
                mainLayout->addWidget(fader, controls.size() + 2,
                                      posCount, Qt::AlignCenter);
                m_faders[faderCount]->m_volumeFader = fader;

                // Label
                //
                QLabel *idLabel = new QLabel(QString("%1").
                                             arg((*iIt)->getId() - firstInstrument + 1),
                                             m_tabFrame);
                idLabel->setObjectName("idLabel");

                mainLayout->addWidget(idLabel, controls.size() + 3,
                                      posCount, Qt::AlignCenter);

                // store id in struct
                m_faders[faderCount]->m_id = (*iIt)->getId();

                // Connect them up
                //
                connect(fader, SIGNAL(faderChanged(float)),
                        this, SLOT(slotFaderLevelChanged(float)));

                // Update all the faders and controllers
                //
                slotUpdateInstrument((*iIt)->getId());

                // Increment counters
                //
                posCount++;
                faderCount++;
            }

            QString name = QString("%1 (%2)")
                           .arg(QObject::tr(dev->getName().c_str()))
                           .arg(deviceCount++);

            addTab(m_tabFrame, name);
        }
    }
}
void
MIDIInstrumentParameterPanel::setupControllers(MidiDevice *md)
{
    RG_DEBUG << "setupControllers()";

    if (!md)
        return;

    // To cut down on flicker, we avoid destroying and recreating
    // widgets as far as possible here.  If a label already exists,
    // we just set its text; if a rotary exists, we only replace it
    // if we actually need a different one.

    Composition &comp = m_doc->getComposition();

    ControlList list = md->getControlParameters();

    // Sort by IPB position.
    std::sort(list.begin(), list.end(),
              ControlParameter::ControlPositionCmp());

    int count = 0;
    RotaryInfoVector::iterator rotaryIter = m_rotaries.begin();

    // For each controller
    for (ControlList::iterator it = list.begin();
            it != list.end(); ++it) {
        if (it->getIPBPosition() == -1)
            continue;

        // Get the knob colour (even if it's default, because otherwise it turns
        // black instead of the default color from the map!  it was here the
        // whole time, this simple!)
        //
        const Colour c = comp.getGeneralColourMap().getColourByIndex(
                it->getColourIndex());
        const QColor knobColour = QColor(c.getRed(), c.getGreen(), c.getBlue());

        Rotary *rotary = 0;

        // If the Rotary widgets have already been created, update them.
        if (rotaryIter != m_rotaries.end()) {

            // Update the controller number that is associated with the
            // existing rotary widget.

            rotaryIter->controller = it->getControllerValue();

            // Update the properties of the existing rotary widget.

            rotary = rotaryIter->rotary;

            rotary->setMinimum(it->getMin());
            rotary->setMaximum(it->getMax());
            // If the default is 64, then this is most likely a "centered"
            // control which should show its distance from the 12 o'clock
            // position around the outside.
            rotary->setCentered((it->getDefault() == 64));
            rotary->setKnobColour(knobColour);

            // Update the controller name.
            rotaryIter->label->setText(QObject::tr(it->getName().c_str()));

            // Next Rotary widget
            ++rotaryIter;

        } else {  // Need to create the Rotary widget.

            // Create a horizontal box for the Rotary/Label pair.
            QWidget *hbox = new QWidget(m_rotaryFrame);
            QHBoxLayout *hboxLayout = new QHBoxLayout;
            hboxLayout->setSpacing(8);
            hboxLayout->setMargin(0);
            hbox->setLayout(hboxLayout);

            // Add a Rotary

            float pageStep = 5.0;
            if (it->getMax() - it->getMin() < 10)
                pageStep = 1.0;
            else if (it->getMax() - it->getMin() < 20)
                pageStep = 2.0;

            rotary = new Rotary(hbox,          // parent
                                it->getMin(),  // minimum
                                it->getMax(),  // maximum
                                1.0,           // step
                                pageStep,      // pageStep
                                it->getDefault(),  // initialPosition
                                20,                // size
                                Rotary::NoTicks,   // ticks
                                false,             // snapToTicks
                                (it->getDefault() == 64));  // centred, see setCentered() above
            rotary->setKnobColour(knobColour);
            hboxLayout->addWidget(rotary);

            // Add a label

            SqueezedLabel *label = new SqueezedLabel(QObject::tr(it->getName().c_str()), hbox);
            label->setFont(font());
            hboxLayout->addWidget(label);

            RG_DEBUG << "setupControllers(): Adding new widget at " << (count / 2) << "," << (count % 2);

            // Add the compound (Rotary and Label) widget to the grid.
            m_rotaryGrid->addWidget(hbox, count / 2, (count % 2) * 2, Qt::AlignLeft);
            hbox->show();

            // Add to the Rotary info list
            RotaryInfo ri;
            ri.rotary = rotary;
            ri.label = label;
            ri.controller = it->getControllerValue();
            m_rotaries.push_back(ri);

            // Connect for changes to the Rotary by the user.
            connect(rotary, SIGNAL(valueChanged(float)),
                    m_rotaryMapper, SLOT(map()));

            rotaryIter = m_rotaries.end();
        }

        // Add signal mapping
        //
        m_rotaryMapper->setMapping(rotary,
                                   int(it->getControllerValue()));

        ++count;
    }

    // If there are more rotary widgets than this instrument needs,
    // delete them.
    if (rotaryIter != m_rotaries.end()) {
        for (RotaryInfoVector::iterator it = rotaryIter; it != m_rotaries.end(); ++it) {
            // ??? Instead of deleting and recreating, we could hide the
            //     extras and bring them back when needed.
            delete it->rotary;
            delete it->label;
        }
        m_rotaries.resize(count);
    }
}