SpinBox.py 文件源码

def stepBy(self, n):
        n = D(int(n))   ## n must be integral number of steps.
        s = [D(-1), D(1)][n >= 0]  ## determine sign of step
        val = self.val

        for i in range(int(abs(n))):

            if self.opts['log']:
                raise Exception("Log mode no longer supported.")
            #    step = abs(val) * self.opts['step']
            #    if 'minStep' in self.opts:
            #        step = max(step, self.opts['minStep'])
            #    val += step * s
            if self.opts['dec']:
                if val == 0:
                    step = self.opts['minStep']
                    exp = None
                else:
                    vs = [D(-1), D(1)][val >= 0]
                    #exp = D(int(abs(val*(D('1.01')**(s*vs))).log10()))
                    fudge = D('1.01')**(s*vs) ## fudge factor. at some places, the step size depends on the step sign.
                    exp = abs(val * fudge).log10().quantize(1, rounding=ROUND_FLOOR)
                    step = self.opts['step'] * D(10)**exp
                if 'minStep' in self.opts:
                    step = max(step, self.opts['minStep'])
                val += s * step
                #print "Exp:", exp, "step", step, "val", val
            else:
                val += s*self.opts['step']

            if 'minStep' in self.opts and abs(val) < self.opts['minStep']:
                val = D(0)
        self.setValue(val, delaySignal=True)  ## note all steps (arrow buttons, wheel, up/down keys..) emit delayed signals only.