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pianokeyboard.h

// -*- c-basic-offset: 4 -*-

/*
    Rosegarden-4
    A sequencer and musical notation editor.

    This program is Copyright 2000-2006
        Guillaume Laurent   <glaurent@telegraph-road.org>,
        Chris Cannam        <cannam@all-day-breakfast.com>,
        Richard Bown        <bownie@bownie.com>

    The moral right of the authors to claim authorship of this work
    has been asserted.

    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.
*/

#ifndef PIANOKEYBOARD_H
#define PIANOKEYBOARD_H

#include <vector>

#include <qwidget.h>

#include "pitchruler.h"
#include "matrixstaff.h"

class PianoKeyboard : public PitchRuler
{
    Q_OBJECT
public:
    PianoKeyboard(QWidget *parent, int keys = 88);

    virtual QSize sizeHint() const;
    virtual QSize minimumSizeHint() const;

    /* 
     * We want to be able to call this from the matrix view
     */
    void drawHoverNote(int evPitch);

signals:

    /**
     * A key has been clicked on the keyboard.
     *
     * The repeating flag is there to tell the MatrixView not to send
     * the same note again as we're in the middle of a swoosh.
     * MatrixView does the y -> Note calculation.
     */
    void keyPressed(unsigned int y, bool repeating);

    /**
     * A key has been clicked with the selection modifier pressed.
     * The MatrixView will probably interpret this as meaning to
     * select all notes of that pitch.
     *
     * The repeating flag is there to tell the MatrixView not to
     * clear the selection as we're in the middle of a swoosh.
     * MatrixView does the y -> Note calculation.
     */
    void keySelected(unsigned int y, bool repeating);

    /**
     * A key has been released on the keyboard.
     *
     * The repeating flag is there to tell the MatrixView not to send
     * the same note again as we're in the middle of a swoosh.
     * MatrixView does the y -> Note calculation.
     */
    void keyReleased(unsigned int y, bool repeating);

    /**
     * Emitted when the mouse cursor moves to a different key when
     * not clicking or selecting.
     * MatrixView does the y -> Note calculation.
     */
    void hoveredOverKeyChanged(unsigned int y);

protected:

    virtual void paintEvent(QPaintEvent*);

    virtual void mouseMoveEvent(QMouseEvent*);
    virtual void mousePressEvent(QMouseEvent*);
    virtual void mouseReleaseEvent(QMouseEvent*);
    virtual void enterEvent(QEvent *);
    virtual void leaveEvent(QEvent *);

    // compute all key positions and store them
    //
    void computeKeyPos();

    //--------------- Data members ---------------------------------
    QSize m_keySize;
    QSize m_blackKeySize;
    unsigned int m_nbKeys;

    std::vector<unsigned int> m_whiteKeyPos;
    std::vector<unsigned int> m_blackKeyPos;
    std::vector<unsigned int> m_labelKeyPos;
    std::vector<unsigned int> m_allKeyPos;

    bool                      m_mouseDown;
    bool                      m_selecting;

    // highlight element on the keyboard
    QWidget                  *m_hoverHighlight;
    int                       m_lastHoverHighlight;
    int                       m_lastKeyPressed;
};

#endif

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