qt中实现QDoubleSlider

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qDoubleSlider.h

#ifndef Q_DOUBLE_SLIDER_H#define Q_DOUBLE_SLIDER_H#include <QtGui/QtGui>#include <QSlider>class QDoubleSlider : public QSlider{    Q_OBJECTpublic:    QDoubleSlider(QWidget* pParent = NULL);    void setRange(double Min, double Max);    void setMinimum(double Min);    double minimum() const;    void setMaximum(double Max);    double maximum() const;    double value() const;    public slots:    void setValue(int value);    void setValue(double Value, bool BlockSignals = false);    private slots:signals :    void valueChanged(double Value);        void rangeChanged(double Min, double Max);private:    doublem_Multiplier;};#endif

qDoubleSlider.cpp

#include "qDoubleSlider.h"QDoubleSlider::QDoubleSlider(QWidget* pParent /*= NULL*/) :QSlider(pParent),m_Multiplier(10000.0){    connect(this, SIGNAL(valueChanged(int)), this, SLOT(setValue(int)));    setSingleStep(1);    setOrientation(Qt::Horizontal);    setFocusPolicy(Qt::NoFocus);}void QDoubleSlider::setValue(int Value){    emit valueChanged((double)Value / m_Multiplier);}void QDoubleSlider::setValue(double Value, bool BlockSignals){    QSlider::blockSignals(BlockSignals);    QSlider::setValue(Value * m_Multiplier);    if (!BlockSignals)        emit valueChanged(Value);    QSlider::blockSignals(false);}void QDoubleSlider::setRange(double Min, double Max){    QSlider::setRange(Min * m_Multiplier, Max * m_Multiplier);    emit rangeChanged(Min, Max);}void QDoubleSlider::setMinimum(double Min){    QSlider::setMinimum(Min * m_Multiplier);    emit rangeChanged(minimum(), maximum());}double QDoubleSlider::minimum() const{    return QSlider::minimum() / m_Multiplier;}void QDoubleSlider::setMaximum(double Max){    QSlider::setMaximum(Max * m_Multiplier);    emit rangeChanged(minimum(), maximum());}double QDoubleSlider::maximum() const{    return QSlider::maximum() / m_Multiplier;}double QDoubleSlider::value() const{    int Value = QSlider::value();    return (double)Value / m_Multiplier;}

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