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PianoKeyboard.cpp

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */

/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.
 
    This program is Copyright 2000-2007
        Guillaume Laurent   <glaurent@telegraph-road.org>,
        Chris Cannam        <cannam@all-day-breakfast.com>,
        Richard Bown        <richard.bown@ferventsoftware.com>
 
    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
    Bown to claim authorship of this work have been asserted.
 
    Other copyrights also apply to some parts of this work.  Please
    see the AUTHORS file and individual file headers for details.
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/


#include "PianoKeyboard.h"
#include "misc/Debug.h"

#include "gui/general/GUIPalette.h"
#include "gui/general/MidiPitchLabel.h"
#include "gui/rulers/PitchRuler.h"
#include "MatrixStaff.h"
#include "MatrixView.h"
#include <qcolor.h>
#include <qcursor.h>
#include <qevent.h>
#include <qfont.h>
#include <qpainter.h>
#include <qsize.h>
#include <qwidget.h>


namespace Rosegarden
{

const unsigned int _smallWhiteKeyHeight = 14;
const unsigned int _whiteKeyHeight = 18;
    
PianoKeyboard::PianoKeyboard(QWidget *parent, int keys)
        : PitchRuler(parent),
        m_keySize(48, 18),
        m_blackKeySize(24, 8),
        m_nbKeys(keys),
        m_mouseDown(false),
        m_hoverHighlight(new QWidget(this)),
        m_lastHoverHighlight(0),
        m_lastKeyPressed(0)
{
    m_hoverHighlight->hide();
    m_hoverHighlight->setPaletteBackgroundColor(GUIPalette::getColour(GUIPalette::MatrixKeyboardFocus));

    setPaletteBackgroundColor(QColor(238, 238, 224));

    computeKeyPos();
    setMouseTracking(true);
}

QSize PianoKeyboard::sizeHint() const
{
    return QSize(m_keySize.width(),
                 m_keySize.height() * m_nbKeys);
}

QSize PianoKeyboard::minimumSizeHint() const
{
    return m_keySize;
}

void PianoKeyboard::computeKeyPos()
{
    //    int y = -9;
    int y = -4;

    unsigned int posInOctave = 0,
                               keyHeight = _smallWhiteKeyHeight;

    for (unsigned int i = 0; i < m_nbKeys; ++i) {
        posInOctave = (i + 5) % 7;

        if (y >= 0) {
            m_whiteKeyPos.push_back(y);
            m_allKeyPos.push_back(y);
        }

        if (posInOctave == 2)
            m_labelKeyPos.push_back(y + (keyHeight * 3 / 4) - 2);

        if (posInOctave == 0 ||
                posInOctave == 2 ||
                posInOctave == 6 ||
                posInOctave == 3) { // draw shorter white key


            keyHeight = _smallWhiteKeyHeight;

            if (posInOctave == 2 ||
                    posInOctave == 6)
                --keyHeight;

        } else {

            keyHeight = _whiteKeyHeight;
        }

        if (posInOctave != 2 && posInOctave != 6) { // draw black key

            unsigned int bY = y + keyHeight - m_blackKeySize.height() / 2;

            m_blackKeyPos.push_back(bY);
            m_allKeyPos.push_back(bY);

        }

        y += keyHeight;
    }
}

void PianoKeyboard::paintEvent(QPaintEvent*)
{
    static QFont *pFont = 0;
    if (!pFont) {
        pFont = new QFont();
        pFont->setPixelSize(9);
    }

    QPainter paint(this);

    paint.setFont(*pFont);

    for (unsigned int i = 0; i < m_whiteKeyPos.size(); ++i)
        paint.drawLine(0, m_whiteKeyPos[i],
                       m_keySize.width(), m_whiteKeyPos[i]);

    for (unsigned int i = 0; i < m_labelKeyPos.size(); ++i) {

        int pitch = (m_labelKeyPos.size() - i) * 12;

        // for some reason I don't immediately comprehend,
        // m_labelKeyPos contains two more octaves than we need
        pitch -= 24;

        MidiPitchLabel label(pitch);
        paint.drawText(m_blackKeySize.width(), m_labelKeyPos[i],
                       label.getQString());
    }

    paint.setBrush(colorGroup().foreground());

    for (unsigned int i = 0; i < m_blackKeyPos.size(); ++i)
        paint.drawRect(0, m_blackKeyPos[i],
                       m_blackKeySize.width(), m_blackKeySize.height());
}

void PianoKeyboard::enterEvent(QEvent *)
{
    //drawHoverNote(e->y());
}

void PianoKeyboard::leaveEvent(QEvent*)
{
    m_hoverHighlight->hide();

    int pos = mapFromGlobal( cursor().pos() ).x();
    if ( pos > m_keySize.width() - 5 || pos < 0 ) { // bit of a hack
        emit keyReleased(m_lastKeyPressed, false);
    }
}

void PianoKeyboard::drawHoverNote(int evPitch)
{
    if (m_lastHoverHighlight != evPitch) {
        //MATRIX_DEBUG << "PianoKeyboard::drawHoverNote : note = " << evPitch << endl;
        m_lastHoverHighlight = evPitch;

        int count = 0;
        std::vector<unsigned int>::iterator it;
        for (it = m_allKeyPos.begin(); it != m_allKeyPos.end(); ++it, ++count) {
            if (126 - evPitch == count) {
                int width = m_keySize.width() - 8;
                int yPos = *it + 5;

                // check if this is a black key
                //
                std::vector<unsigned int>::iterator bIt;
                bool isBlack = false;
                for (bIt = m_blackKeyPos.begin(); bIt != m_blackKeyPos.end(); ++bIt) {
                    if (*bIt == *it) {
                        isBlack = true;
                        break;
                    }
                }

                // Adjust for black note
                //
                if (isBlack) {
                    width = m_blackKeySize.width() - 8;
                    yPos -= 3;
                } else {
                    // If a white note then ensure that we allow for short/tall ones
                    //
                    std::vector<unsigned int>::iterator wIt = m_whiteKeyPos.begin(), tIt;

                    while (wIt != m_whiteKeyPos.end()) {
                        if (*wIt == *it) {
                            tIt = wIt;

                            if (++tIt != m_whiteKeyPos.end()) {
                                //MATRIX_DEBUG << "WHITE KEY HEIGHT = " << *tIt - *wIt << endl;
                                if (*tIt - *wIt == _whiteKeyHeight) {
                                    yPos += 2;
                                }

                            }
                        }

                        ++wIt;
                    }


                }

                m_hoverHighlight->setFixedSize(width, 4);
                m_hoverHighlight->move(3, yPos);
                m_hoverHighlight->show();

                return ;
            }
        }
    }


}

void PianoKeyboard::mouseMoveEvent(QMouseEvent* e)
{
    // The routine to work out where this should appear doesn't coincide with the note
    // that we send to the sequencer - hence this is a bit pointless and crap at the moment.
    // My own fault it's so crap but there you go.
    //
    // RWB (20040220)
    //
    MatrixView *matrixView = dynamic_cast<MatrixView*>(topLevelWidget());
    if (matrixView) {
        MatrixStaff *staff = matrixView->getStaff(0);

        if (staff) {
            drawHoverNote(staff->getHeightAtCanvasCoords(e->x(), e->y()));
        }
    }

    if (e->state() & Qt::LeftButton) {
        if (m_selecting)
            emit keySelected(e->y(), true);
        else
            emit keyPressed(e->y(), true); // we're swooshing

        emit keyReleased(m_lastKeyPressed, true);
        m_lastKeyPressed = e->y();
    } else
        emit hoveredOverKeyChanged(e->y());
}

void PianoKeyboard::mousePressEvent(QMouseEvent *e)
{
    Qt::ButtonState bs = e->state();

    if (e->button() == LeftButton) {
        m_mouseDown = true;
        m_selecting = (bs & Qt::ShiftButton);
        m_lastKeyPressed = e->y();

        if (m_selecting)
            emit keySelected(e->y(), false);
        else
            emit keyPressed(e->y(), false);
    }
}

void PianoKeyboard::mouseReleaseEvent(QMouseEvent *e)
{
    if (e->button() == LeftButton) {
        m_mouseDown = false;
        m_selecting = false;
        emit keyReleased(e->y(), false);
    }
}

}
#include "PianoKeyboard.moc"

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