Qt默認的QSlider和QSpinbox只能實現整數調整，不能實現浮點的變化，因此設計了如下可實現浮點變化的QFloatSlider和QFloatSpinner：

QFloatSlider.h

class QFloatSlider : public QSlider
{Q_OBJECTpublic:QFloatSlider(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:double	m_Multiplier;
};

QFloatSlider.cpp

QFloatSlider::QFloatSlider(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 QFloatSlider::setValue(int Value)
{emit valueChanged((double)Value / m_Multiplier);
}void QFloatSlider::setValue(double Value, bool BlockSignals)
{QSlider::blockSignals(BlockSignals);QSlider::setValue(Value * m_Multiplier);if (!BlockSignals)emit valueChanged(Value);QSlider::blockSignals(false);
}void QFloatSlider::setRange(double Min, double Max)
{QSlider::setRange(Min * m_Multiplier, Max * m_Multiplier);emit rangeChanged(Min, Max);
}void QFloatSlider::setMinimum(double Min)
{QSlider::setMinimum(Min * m_Multiplier);emit rangeChanged(minimum(), maximum());
}double QFloatSlider::minimum() const
{return QSlider::minimum() / m_Multiplier;
}void QFloatSlider::setMaximum(double Max)
{QSlider::setMaximum(Max * m_Multiplier);emit rangeChanged(minimum(), maximum());
}double QFloatSlider::maximum() const
{return QSlider::maximum() / m_Multiplier;
}double QFloatSlider::value() const
{int Value = QSlider::value();return (double)Value / m_Multiplier;
}

QFloatSpinner.h

class QFloatSpinner : public QDoubleSpinBox
{Q_OBJECTpublic:QFloatSpinner(QWidget* pParent = NULL);;virtual QSize sizeHint() const;void setValue(double Value, bool BlockSignals = false);
};

QSize QFloatSpinner::sizeHint() const
{return QSize(90, 20);
}QFloatSpinner::QFloatSpinner(QWidget* pParent /*= NULL*/) :QDoubleSpinBox(pParent)
{
}void QFloatSpinner::setValue(double Value, bool BlockSignals)
{blockSignals(BlockSignals);QDoubleSpinBox::setValue(Value);blockSignals(false);
}

總結

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