1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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2 | * Qwt Widget Library
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3 | * Copyright (C) 1997 Josef Wilgen
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4 | * Copyright (C) 2002 Uwe Rathmann
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5 | *
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6 | * This library is free software; you can redistribute it and/or
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7 | * modify it under the terms of the Qwt License, Version 1.0
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8 | *****************************************************************************/
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9 |
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10 | #ifndef QWT_KNOB_H
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11 | #define QWT_KNOB_H
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12 |
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13 | #include "qwt_global.h"
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14 | #include "qwt_abstract_slider.h"
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15 | #include "qwt_abstract_scale.h"
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16 |
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17 | class QwtRoundScaleDraw;
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18 |
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19 | /*!
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20 | \brief The Knob Widget
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21 |
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22 | The QwtKnob widget imitates look and behaviour of a volume knob on a radio.
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23 | It contains a scale around the knob which is set up automatically or can
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24 | be configured manually (see QwtAbstractScale).
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25 | Automatic scrolling is enabled when the user presses a mouse
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26 | button on the scale. For a description of signals, slots and other
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27 | members, see QwtAbstractSlider.
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28 |
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29 | \image html knob.png
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30 | \sa QwtAbstractSlider and QwtAbstractScale for the descriptions
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31 | of the inherited members.
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32 | */
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33 |
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34 | class QWT_EXPORT QwtKnob : public QwtAbstractSlider, public QwtAbstractScale
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35 | {
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36 | Q_OBJECT
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37 | Q_ENUMS (Symbol)
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38 | Q_PROPERTY( int knobWidth READ knobWidth WRITE setKnobWidth )
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39 | Q_PROPERTY( int borderWidth READ borderWidth WRITE setBorderWidth )
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40 | Q_PROPERTY( double totalAngle READ totalAngle WRITE setTotalAngle )
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41 | Q_PROPERTY( Symbol symbol READ symbol WRITE setSymbol )
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42 |
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43 | public:
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44 | /*!
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45 | Symbol
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46 | \sa QwtKnob::QwtKnob()
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47 | */
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48 |
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49 | enum Symbol { Line, Dot };
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50 |
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51 | explicit QwtKnob(QWidget* parent = NULL);
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52 | #if QT_VERSION < 0x040000
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53 | explicit QwtKnob(QWidget* parent, const char *name);
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54 | #endif
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55 | virtual ~QwtKnob();
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56 |
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57 | void setKnobWidth(int w);
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58 | int knobWidth() const;
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59 |
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60 | void setTotalAngle (double angle);
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61 | double totalAngle() const;
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62 |
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63 | void setBorderWidth(int bw);
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64 | int borderWidth() const;
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65 |
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66 | void setSymbol(Symbol);
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67 | Symbol symbol() const;
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68 |
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69 | virtual QSize sizeHint() const;
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70 | virtual QSize minimumSizeHint() const;
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71 |
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72 | void setScaleDraw(QwtRoundScaleDraw *);
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73 | const QwtRoundScaleDraw *scaleDraw() const;
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74 | QwtRoundScaleDraw *scaleDraw();
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75 |
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76 | protected:
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77 | virtual void paintEvent(QPaintEvent *e);
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78 | virtual void resizeEvent(QResizeEvent *e);
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79 |
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80 | void draw(QPainter *p, const QRect& ur);
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81 | void drawKnob(QPainter *p, const QRect &r);
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82 | void drawMarker(QPainter *p, double arc, const QColor &c);
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83 |
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84 | private:
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85 | void initKnob();
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86 | void layoutKnob( bool update = true );
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87 | double getValue(const QPoint &p);
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88 | void getScrollMode( const QPoint &p, int &scrollMode, int &direction );
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89 | void recalcAngle();
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90 |
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91 | virtual void valueChange();
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92 | virtual void rangeChange();
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93 | virtual void scaleChange();
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94 | virtual void fontChange(const QFont &oldFont);
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95 |
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96 | class PrivateData;
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97 | PrivateData *d_data;
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98 | };
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99 |
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100 | #endif
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