qwt_knob.h

/******************************************************************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *
 * Modified by ChenZongYan in 2024 <czy.t@163.com>
 *   Summary of major modifications (see ChangeLog.md for full history):
 *   1. CMake build system & C++11 throughout.
 *   2. Core panner/ zoomer refactored:
 *        - QwtPanner → QwtCachePanner (pixmap-cache version)
 *        - New real-time QwtPlotPanner derived from QwtPicker.
 *   3. Zoomer supports multi-axis.
 *   4. Parasite-plot framework:
 *        - QwtFigure, QwtPlotParasiteLayout, QwtPlotTransparentCanvas,
 *        - QwtPlotScaleEventDispatcher, built-in pan/zoom on axis.
 *   5. New picker: QwtPlotSeriesDataPicker (works with date axis).
 *   6. Raster & color-map extensions:
 *        - QwtGridRasterData (2-D table + interpolation)
 *        - QwtLinearColorMap::stopColors(), stopPos() API rename.
 *   7. Bar-chart: expose pen/brush control.
 *   8. Amalgamated build: single QwtPlot.h / QwtPlot.cpp pair in src-amalgamate.
 *****************************************************************************/
 
#ifndef QWT_KNOB_H
#define QWT_KNOB_H
 
#include "qwt_global.h"
#include "qwt_abstract_slider.h"
 
class QwtRoundScaleDraw;
 
class QWT_EXPORT QwtKnob : public QwtAbstractSlider
{
    Q_OBJECT
 
    Q_ENUMS(KnobStyle MarkerStyle)
 
    Q_PROPERTY(KnobStyle knobStyle READ knobStyle WRITE setKnobStyle)
    Q_PROPERTY(int knobWidth READ knobWidth WRITE setKnobWidth)
    Q_PROPERTY(Qt::Alignment alignment READ alignment WRITE setAlignment)
    Q_PROPERTY(double totalAngle READ totalAngle WRITE setTotalAngle)
    Q_PROPERTY(int numTurns READ numTurns WRITE setNumTurns)
    Q_PROPERTY(MarkerStyle markerStyle READ markerStyle WRITE setMarkerStyle)
    Q_PROPERTY(int markerSize READ markerSize WRITE setMarkerSize)
    Q_PROPERTY(int borderWidth READ borderWidth WRITE setBorderWidth)
 
public:
    enum KnobStyle
    {
        Flat,
 
        Raised,
 
        Sunken,
 
        Styled
    };
 
    enum MarkerStyle
    {
        NoMarker = -1,
 
        Tick,
 
        Triangle,
 
        Dot,
 
        Nub,
 
        Notch
    };
 
    explicit QwtKnob(QWidget* parent = nullptr);
    ~QwtKnob() override;
 
    void setAlignment(Qt::Alignment);
    Qt::Alignment alignment() const;
 
    void setKnobWidth(int);
    int knobWidth() const;
 
    void setNumTurns(int);
    int numTurns() const;
 
    void setTotalAngle(double angle);
    double totalAngle() const;
 
    void setKnobStyle(KnobStyle);
    KnobStyle knobStyle() const;
 
    void setBorderWidth(int);
    int borderWidth() const;
 
    void setMarkerStyle(MarkerStyle);
    MarkerStyle markerStyle() const;
 
    void setMarkerSize(int);
    int markerSize() const;
 
    virtual QSize sizeHint() const override;
    virtual QSize minimumSizeHint() const override;
 
    void setScaleDraw(QwtRoundScaleDraw*);
 
    const QwtRoundScaleDraw* scaleDraw() const;
    QwtRoundScaleDraw* scaleDraw();
 
    QRect knobRect() const;
 
protected:
    virtual void paintEvent(QPaintEvent*) override;
    virtual void changeEvent(QEvent*) override;
 
    virtual void drawKnob(QPainter*, const QRectF&) const;
 
    virtual void drawFocusIndicator(QPainter*) const;
 
    virtual void drawMarker(QPainter*, const QRectF&, double angle) const;
 
    virtual double scrolledTo(const QPoint&) const override;
    virtual bool isScrollPosition(const QPoint&) const override;
 
private:
    QWT_DECLARE_PRIVATE(QwtKnob)
};
 
#endif