colorbar.h

QWT5.01用于Qt开发的二维图形库程序

#include <qwidget.h>

class ColorBar: public QWidget
{
    Q_OBJECT

public:
    ColorBar(Qt::Orientation = Qt::Horizontal, 
        QWidget * = NULL);

    virtual void setOrientation(Qt::Orientation o);
    Qt::Orientation orientation() const { return d_orientation; }

    void setRange(const QColor &light, const QColor &dark);
    void setLight(const QColor &light);
    void setDark(const QColor &dark);

    QColor light() const { return d_light; }
    QColor dark() const { return d_dark; }

signals:
    void selected(const QColor &);

protected:
    virtual void mousePressEvent(QMouseEvent *);
    virtual void paintEvent(QPaintEvent *);

    void drawColorBar(QPainter *, const QRect &) const;

private:
    Qt::Orientation d_orientation;
    QColor d_light;
    QColor d_dark;
};