import sys

from PyQt4.QtCore import *

from PyQt4.QtGui import *

import ui_price

class PriceDlg(QDialog,ui_price.Ui_Dialog):

    def __init__(self,parent=None):

        super(PriceDlg,self).__init__(parent)

        self.setupUi(self)

        #self.whenTimeEdit.timeChanged

        self.okPushButton.setHidden(1)

    def on_custmorLineEdit_textChanged(self):

        self.okPushButton.setHidden(0)

        #self.okPushButton.setEnabled(enable)

    @pyqtSignature('')

    def on_okPushButton_clicked(self):

        self.setamount(self.getprice()*self.getquan())

    @pyqtSignature('')

    def on_whenTimeEdit_timeChanged(self):

        self.setamount(self.getprice()*self.getquan())

    def setamount(self,amount):

        self.amountLineEdit.setText(str(amount))

    def getprice(self):

        return float(self.priceSpinBox.text())

    def getquan(self):

        return float(self.QuanSpinBox.text())

app=QApplication(sys.argv)

form=PriceDlg()

form.show()

app.exec_()