loopruler.h

LINUX下的混音软件

/* -*- 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   <[e-mail]>,
        Chris Cannam        <[e-mail]>,
        Richard Bown        <[e-mail]>

    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.
*/

#ifndef _RG_LOOPRULER_H_
#define _RG_LOOPRULER_H_

#include "base/SnapGrid.h"
#include "gui/general/HZoomable.h"
#include <qsize.h>
#include <qwidget.h>
#include "base/Event.h"


class QPaintEvent;
class QPainter;
class QMouseEvent;


namespace Rosegarden
{

class RulerScale;


/**
 * LoopRuler is a widget that shows bar and beat durations on a
 * ruler-like scale, and reacts to mouse clicks by sending relevant
 * signals to modify position pointer and playback/looping states.
*/
class LoopRuler : public QWidget, public HZoomable
{
    Q_OBJECT

public:
    LoopRuler(RulerScale *rulerScale,
              int height = 0,
              double xorigin = 0.0,
              bool invert = false,
              QWidget* parent = 0,
              const char *name = 0);

    ~LoopRuler();

    void setSnapGrid(SnapGrid *grid);

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

    void scrollHoriz(int x);

    void setMinimumWidth(int width) { m_width = width; }

    void setHorizScaleFactor(double dy) { m_hScaleFactor = dy; }

    bool hasActiveMousePress() { return m_activeMousePress; }

    bool getLoopingMode() { return m_loopingMode; }
    
public slots:
    void slotSetLoopMarker(timeT startLoop,
                           timeT endLoop);

protected:
    // ActiveItem interface
    virtual void mousePressEvent       (QMouseEvent*);
    virtual void mouseReleaseEvent     (QMouseEvent*);
    virtual void mouseDoubleClickEvent (QMouseEvent*);
    virtual void mouseMoveEvent        (QMouseEvent*);

    virtual void paintEvent(QPaintEvent*);

    void setLoopingMode(bool value) { m_loopingMode = value; }
    void drawBarSections(QPainter*);
    void drawLoopMarker(QPainter*);  // between loop positions

signals:
    // The three main functions that this class performs
    //
    /// Set the pointer position on mouse single click
    void setPointerPosition(timeT);

    /// Set the pointer position on mouse drag
    void dragPointerToPosition(timeT);

    /// Set pointer position and start playing on double click
    void setPlayPosition(timeT);

    /// Set a playing loop
    void setLoop(timeT, timeT);

    /// Set the loop end position on mouse drag
    void dragLoopToPosition(timeT);

    void startMouseMove(int directionConstraint);
    void stopMouseMove();
    void mouseMove();

protected:

    //--------------- Data members ---------------------------------
    int  m_height;
    double m_xorigin;
    bool m_invert;
    int  m_currentXOffset;
    int  m_width;
    bool m_activeMousePress;

    RulerScale *m_rulerScale;
    SnapGrid    m_defaultGrid;
    SnapGrid    m_loopGrid;
    SnapGrid   *m_grid;
    
    bool m_loopingMode;
    timeT m_startLoop;
    timeT m_endLoop;
};


}

#endif