[89] | 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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