Panner.h

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

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006 QMUL.
    
    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 SV_PANNER_H
#define SV_PANNER_H

#include <QWidget>

#include "WheelCounter.h"

class Panner : public QWidget
{
    Q_OBJECT

public:
    Panner(QWidget *parent = 0);
    virtual ~Panner();

    void setDefaultRectCentre(float, float);

    void setThumbColour(QColor colour);
    void setAlpha(int backgroundAlpha, int thumbAlpha);

    void setScrollUnit(float unit);

    void getRectExtents(float &x0, float &y0, float &width, float &height);

    QSize sizeHint() const override;

signals:
    void rectExtentsChanged(float, float, float, float);

    void rectCentreMoved(float, float);

    void doubleClicked();

    void mouseEntered();
    void mouseLeft();

public slots:
    void setRectExtents(float x0, float y0, float width, float height);

    void setRectWidth(float width);

    void setRectHeight(float height);

    void setRectCentreX(float x);
    
    void setRectCentreY(float y);

    void scroll(bool up);

    void scroll(bool up, int n);

    void resetToDefault();

protected:
    void mousePressEvent(QMouseEvent *e) override;
    void mouseDoubleClickEvent(QMouseEvent *e) override;
    void mouseMoveEvent(QMouseEvent *e) override;
    void mouseReleaseEvent(QMouseEvent *e) override;
    void wheelEvent(QWheelEvent *e) override;
    void paintEvent(QPaintEvent *e) override;
    void enterEvent(QEvent *) override;
    void leaveEvent(QEvent *) override;

    void normalise();
    void emitAndUpdate();

    float m_rectX;
    float m_rectY;
    float m_rectWidth;
    float m_rectHeight;
    float m_scrollUnit;

    float m_defaultCentreX;
    float m_defaultCentreY;
    bool m_defaultsSet;

    QColor m_thumbColour;
    int m_backgroundAlpha;
    int m_thumbAlpha;

    float centreX() const { return m_rectX + m_rectWidth/2; }
    float centreY() const { return m_rectY + m_rectHeight/2; }

    bool m_clicked;
    QPoint m_clickPos;
    float m_dragStartX;
    float m_dragStartY;

    WheelCounter m_wheelCounter;
};

#endif