view widgets/LevelPanWidget.h @ 1534:bfd8b22fd67c

Fix #1904 Scrolling colour 3d plot does not always work when in View normalisation mode. We shouldn't imagine we've just invalidated the cache if the truth is that we've only just created the renderer

/* -*- 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 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 LEVEL_PAN_WIDGET_H
#define LEVEL_PAN_WIDGET_H

#include <QWidget>

#include "WheelCounter.h"

/**
 * A simple widget for coarse level and pan control.
 */

class LevelPanWidget : public QWidget
{
    Q_OBJECT

public:
    LevelPanWidget(QWidget *parent = 0);
    ~LevelPanWidget();
    
    /// Return level as a gain value. The basic level range is [0,1] but the
    /// gain scale may go up to 4.0
    float getLevel() const; 
    
    /// Return pan as a value in the range [-1,1]
    float getPan() const;

    /// Find out whether the widget is editable
    bool isEditable() const;

    /// Discover whether the level range includes muting or not
    bool includesMute() const;

    /// Draw a suitably sized copy of the widget's contents to the given device
    void renderTo(QPaintDevice *, QRectF, bool asIfEditable) const;

    QSize sizeHint() const override;
                                               
public slots:
    /// Set level. The basic level range is [0,1] but the scale may go
    /// higher. The value will be rounded.
    void setLevel(float);

    /// Set pan in the range [-1,1]. The value will be rounded
    void setPan(float);

    /// Set left and right peak monitoring levels in the range [0,1]
    void setMonitoringLevels(float, float);
    
    /// Specify whether the widget is editable or read-only (default editable)
    void setEditable(bool);

    /// Specify whether the level range should include muting or not
    void setIncludeMute(bool);

    /// Reset to default values
    void setToDefault();
    
    // public so it can be called from LevelPanToolButton (ew)
    void wheelEvent(QWheelEvent *ev) override;
    
signals:
    void levelChanged(float); // range [0,1]
    void panChanged(float); // range [-1,1]

    void mouseEntered();
    void mouseLeft();
    
protected:
    void mousePressEvent(QMouseEvent *ev) override;
    void mouseMoveEvent(QMouseEvent *ev) override;
    void mouseReleaseEvent(QMouseEvent *ev) override;
    void paintEvent(QPaintEvent *ev) override;
    void enterEvent(QEvent *) override;
    void leaveEvent(QEvent *) override;

    void emitLevelChanged();
    void emitPanChanged();

    int m_minNotch;
    int m_maxNotch;
    int m_notch;
    int m_pan;
    float m_monitorLeft;
    float m_monitorRight;
    bool m_editable;
    bool m_editing;
    bool m_includeMute;
    bool m_includeHalfSteps;

    WheelCounter m_wheelCounter;

    int clampNotch(int notch) const;
    int clampPan(int pan) const;

    int audioLevelToNotch(float audioLevel) const;
    float notchToAudioLevel(int notch) const;

    int audioPanToPan(float audioPan) const;
    float panToAudioPan(int pan) const;

    int coordsToNotch(QRectF rect, QPointF pos) const;
    int coordsToPan(QRectF rect, QPointF pos) const;

    QColor cellToColour(int cell) const;
    
    QSizeF cellSize(QRectF) const;
    QPointF cellCentre(QRectF, int row, int col) const;
    QSizeF cellLightSize(QRectF) const;
    QRectF cellLightRect(QRectF, int row, int col) const;
    QRectF cellOutlineRect(QRectF, int row, int col) const;
    double thinLineWidth(QRectF) const;
    double cornerRadius(QRectF) const;
};

#endif