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   源码介绍

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QT自绘圆形进度条

protected:
    virtual void paintEvent(QPaintEvent *event);
    virtual void drawBackground(QPainter& p, const QRectF& baseRect);
    virtual void drawBase(QPainter &p, const QRectF &baseRect,const QRectF &innerRect);
    virtual void drawValue(QPainter &p , const QRectF &baseRect , double value , double arcLength, const QRectF & innerRect , double innerRadius);
    virtual void calculateInnerRect(const QRectF& baseRect, double outerRadius, QRectF& innerRect, double& innerRadius);
    virtual void drawInnerBackground(QPainter& p, const QRectF& innerRect);
    virtual void drawText(QPainter& p, const QRectF& innerRect, double innerRadius, double value);
    virtual QString valueToText(double value) const;
    virtual void valueFormatChanged();

    virtual QSize minimumSizeHint() const { return QSize(32,32); }

    virtual bool hasHeightForWidth() const { return true; }
    virtual int heightForWidth(int w) const { return w; }

    void rebuildDataBrushIfNeeded();

    double m_min, m_max;
    double m_value;

    double m_nullPosition;
    BarStyle m_barStyle;
    double m_outlinePenWidth, m_dataPenWidth;

    QGradientStops m_gradientData;
    bool m_rebuildBrush;

    QString m_format;
    int m_decimals;
    double m_innerOuterRate;

    static const int UF_VALUE = 1;
    static const int UF_PERCENT = 2;
    static const int UF_MAX = 4;
    int m_updateFlags;