def demoWidget(self):
cb = QCheckBox("MyCheckBox", self)
cb.move(0, 0)
cb.resize(cb.sizeHint()) #가장 최적의 사이즈를 찾아줌
cb.stateChanged.connect(self.changed)
#stateChanged는 시그널임. self.changed
s = QSlider(QtCore.Qt.Horizontal , self)
s.move(30,30)
s.setRange(0,100) #범위 지정
s.resize(300,10)
s.setSingleStep(2) #최소 단위 설정
s.valueChanged.connect(self.slider)
self.label = QLabel(self)
self.label.move(0, 100)
self.label.setText("Hello <b style='color: red'>QLabel</b>")
self.qle1 = QLineEdit(self)
self.qle2 = QLineEdit(self)
label2 = QLabel(self)
self.qle1.move(0,150)
label2.move(110,150)
label2.setText("+")
label2.resize(20,30)
self.qle2.move(130,150)
self.button = QPushButton("result", self)
self.button.move(0,200)
self.button.clicked.connect(self.calculation_add)
self.result = QLabel(self)
self.result.move(0,250)
self.result.setFont(QtGui.QFont('SansSerif', 20))
