*pyqt_one<lcdnumber spinbox slider>

class Dialog(QtGui.QDialog):
    def __init__(self):
        QtGui.QDialog.__init__(self)
        self.setFixedSize(200,200)
        self.spinbox = QtGui.QSpinBox()
        self.spinbox.setRange(0,100)
        self.spinbox.setValue(50)

        self.slider = QtGui.QSlider(QtCore.Qt.Horizontal)
        self.slider.setRange(0,100)

        self.lcd = QtGui.QLCDNumber(5)

        self.line_edit = QtGui.QLineEdit()
        self.line_edit.setText("start")

        self.quit = QtGui.QPushButton('Quit')

        self.connect(self.slider,QtCore.SIGNAL("valueChanged(int)"),self.spinbox,QtCore.SLOT("setValue(int)"))
        self.connect(self.slider,QtCore.SIGNAL("valueChanged(int)"),self.lcd_changed)
        self.connect(self.quit,QtCore.SIGNAL("clicked()"),self,QtCore.SLOT('close()'))
        
        self.layout_a = QtGui.QHBoxLayout()
        self.layout_a.addWidget(self.spinbox)
        self.layout_a.addWidget(self.slider)

        self.layout_b = QtGui.QHBoxLayout()
        self.layout_b.addWidget(self.lcd)
        self.layout_b.addWidget(self.line_edit)

        self.layout = QtGui.QVBoxLayout()
        self.layout.addWidget(self.quit)
        self.layout.addLayout(self.layout_a)
        self.layout.addLayout(self.layout_b)
        
        self.setLayout(self.layout)
    def lcd_changed(self):
        value = self.slider.value()
        self.lcd.display(value)
        self.line_edit.setText(str(value))
if __name__ == '__main__':        
    app = QtGui.QApplication(sys.argv)
    widget = Dialog()
    widget.setWindowTitle('mmc')
    widget.show()
    sys.exit(app.exec_())
# 面向对象