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这是我的 PyQt4 的 QDoubleSpinBox 的示例代码。我从该站点获得此代码并对其进行了修改。

class PowerSpinBox(QtGui.QDoubleSpinBox):
    def __init__(self, min, max, step, decimals, dec_format, parent=None):
        super(PowerSpinBox, self).__init__(parent)
        self.setRange(min,max)
        self.step = step
        self.dec = decimals
        self.dec_fmt = '%.6E'
        self.setDecimals(decimals)

    def textFromValue(self, value):
        if value >= 0:
            return ' %.6E'%value
        else:
            return '%.6E'%value

    def fixup(self, input):
        value = input.toDouble()[0]

        print '>>> PowerSpinBox:fixup:', value, input, step, value%step

        if (value % self.step) > 0: #self.step*0.1:  # old: '> 0:'
            if value < 0:
                value=value*(-1)
                minus=True
            else:
                minus=False
            newValue = value # old: float((int(value*1000)/1)*1)/1000

            if minus: newValue = newValue*(-1)
            newInput = '%.6E'%newValue  # newInput: string
            if not minus: newInput = '+'+newInput
            print "Invalid value [%s] replaced with [%s]"%(input, newInput)
            QtGui.QApplication.beep()
            input.replace(0, input.length(), newInput)

    def validate(self, input, pos):
        valid = QtGui.QValidator.Invalid
        newChar = input.at(pos-1)
        # print '+++ PowerSpinBox.validate:', input, newChar, pos
        if pos < 1:
            valid = QtGui.QValidator.Acceptable
        else:
            if not newChar.isDigit():
                if ((newChar.cell() == '.') and (input.count('.') == 1)) or \
                   ((newChar.cell() == '-') and (pos == 1)) or \
                   ((newChar.cell() == '+') and (pos == 1)):
                    valid = QtGui.QValidator.Acceptable
                else:
                    valid = QtGui.QValidator.Invalid
            else:
                value = input.toDouble()[0]
                if (not (value >= self.minimum() and value <= self.maximum())) or \
                   (input.length() > input.indexOf('.')+self.decimals()+6):
                    valid = QtGui.QValidator.Invalid
                else:
                    valid = QtGui.QValidator.Acceptable
        return (valid, pos)
# class_PowerSpinBox

在此示例代码中，我想通过 1.0e-14 的步长来控制该值。但我不能那样做。如何在 PyQt4 的 QDoubleSpinBox 中将最小值步长设置为 1.0e-14。

先感谢您。

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