class Calculator(QWidget):
def __init__(self, parent=None):
super(Calculator, self).__init__(parent)
self.resultValue = 0
self.memoryValue = 0
self.putInNum = 0
self.initUI()
self.operator = ''
print('KEY\t\t记忆\t\t输入\t\t显示')
self.showState()
def showState(self):
print('\t\t%s\t\t%s\t\t%s' %
(self.memoryValue, self.putInNum, self.resultValue))
def initUI(self):
self.lcdScreen = QLCDNumber()
self.lcdScreen.setDigitCount(8)
self.updateScreen()
btn_1 = QPushButton('1')
btn_2 = QPushButton('2')
btn_3 = QPushButton('3')
btn_4 = QPushButton('4')
btn_5 = QPushButton('5')
btn_6 = QPushButton('6')
btn_7 = QPushButton('7')
btn_8 = QPushButton('8')
btn_9 = QPushButton('9')
btn_0 = QPushButton('0')
btn_demical = QPushButton('.')
btn_convert = QPushButton('±')
btn_C = QPushButton('C')
btn_back = QPushButton('←')
btn_plus = QPushButton('+')
btn_minus = QPushButton('-')
btn_multi = QPushButton('x')
btn_divid = QPushButton('/')
btn_equal = QPushButton('=')
btn_CE = QPushButton('CE')
btn_1.clicked.connect(lambda: self.numBtnPressed(1))
btn_2.clicked.connect(lambda: self.numBtnPressed(2))
btn_3.clicked.connect(lambda: self.numBtnPressed(3))
btn_4.clicked.connect(lambda: self.numBtnPressed(4))
btn_5.clicked.connect(lambda: self.numBtnPressed(5))
btn_6.clicked.connect(lambda: self.numBtnPressed(6))
btn_7.clicked.connect(lambda: self.numBtnPressed(7))
btn_8.clicked.connect(lambda: self.numBtnPressed(8))
btn_9.clicked.connect(lambda: self.numBtnPressed(9))
btn_0.clicked.connect(lambda: self.numBtnPressed(0))
btn_demical.clicked.connect(self.demicalBtnPressed)
btn_convert.clicked.connect(self.convertBtnPressed)
btn_plus.clicked.connect(lambda: self.operatorBtn(11))
btn_minus.clicked.connect(lambda: self.operatorBtn(12))
btn_multi.clicked.connect(lambda: self.operatorBtn(13))
btn_divid.clicked.connect(lambda: self.operatorBtn(14))
btn_equal.clicked.connect(self.getResult)
btn_CE.clicked.connect(self.screenClear)
btnGridLayout = QGridLayout()
btnGridLayout.addWidget(btn_CE, 0, 0)
btnGridLayout.addWidget(btn_C, 0, 1)
btnGridLayout.addWidget(btn_back, 0, 2)
btnGridLayout.addWidget(btn_divid, 0, 3)
btnGridLayout.addWidget(btn_7, 1, 0)
btnGridLayout.addWidget(btn_8, 1, 1)
btnGridLayout.addWidget(btn_9, 1, 2)
btnGridLayout.addWidget(btn_multi, 1, 3)
btnGridLayout.addWidget(btn_4, 2, 0)
btnGridLayout.addWidget(btn_5, 2, 1)
btnGridLayout.addWidget(btn_6, 2, 2)
btnGridLayout.addWidget(btn_minus, 2, 3)
btnGridLayout.addWidget(btn_1, 3, 0)
btnGridLayout.addWidget(btn_2, 3, 1)
btnGridLayout.addWidget(btn_3, 3, 2)
btnGridLayout.addWidget(btn_plus, 3, 3)
btnGridLayout.addWidget(btn_convert, 4, 0)
btnGridLayout.addWidget(btn_0, 4, 1)
btnGridLayout.addWidget(btn_demical, 4, 2)
btnGridLayout.addWidget(btn_equal, 4, 3)
mainLayout = QVBoxLayout()
mainLayout.addWidget(self.lcdScreen)
mainLayout.addLayout(btnGridLayout)
self.setLayout(mainLayout)
self.setWindowTitle('阿焦的计算器')
self.resize(300, 300)
def numBtnPressed(self, num):
if self.putInNum < 0:
putInResulet = self.putInNum * 10 - num
else:
putInResulet = self.putInNum * 10 + num
if self.lcdScreen.checkOverflow(putInResulet) == False:
self.putInNum = putInResulet
self.resultValue = self.putInNum
self.updateScreen()
print(num, end='')
self.showState()
def operatorBtn(self, btn_enum):
tuple1 = ('+', '-', 'x', '/')
self.memoryValue = self.resultValue
self.putInNum = 0
print(tuple1[btn_enum - 11], end='')
self.operator = Operator(btn_enum)
self.showState()
def demicalBtnPressed(self):
pass
def convertBtnPressed(self):
self.putInNum = -self.putInNum
self.resultValue = self.putInNum
self.updateScreen()
print('±', end='')
self.showState()
def getResult(self):
print('=', end='')
calculateResult = self.resultValue
if self.operator == Operator.plus:
calculateResult = self.memoryValue + self.putInNum
elif self.operator == Operator.minus:
calculateResult = self.memoryValue - self.putInNum
elif self.operator == Operator.multi:
calculateResult = self.memoryValue * self.putInNum
elif self.operator == Operator.divide:
if self.putInNum != 0:
calculateResult = self.memoryValue / self.putInNum
else:
self.reportError()
if self.lcdScreen.checkOverflow(calculateResult) == False:
self.resultValue = calculateResult
self.memoryValue = calculateResult
self.putInNum = 0
self.updateScreen()
self.showState()
self.operator = ''
def screenClear(self):
self.memoryValue = 0
self.putInNum = 0
self.resultValue = 0
self.updateScreen()
print('CE', end='')
self.showState()
def updateScreen(self):
self.lcdScreen.display(self.resultValue)
def reportError(self):
QMessageBox.warning(self, '错误', '除数不能是0!')
