转载：pyqt的signal和solit

import sys
from PyQt5.QtCore import pyqtSignal, pyqtSlot, Qt
from PyQt5.QtWidgets import QWidget, QApplication


class MyWidget(QWidget):
    Signal_NoParameters = pyqtSignal()
    Signal_OneParameter = pyqtSignal(int)
    Signal_OneParameter_Overload =pyqtSignal([int],[str])
    Signal_TwoParameters = pyqtSignal(int,str)
    Signal_TwoParameters_Overload =pyqtSignal([int,int],[int,str])
    





    def mousePressEvent(self, event):
        self.Signal_NoParameters.emit()
        self.Signal_OneParameter.emit(1)
        self.Signal_OneParameter_Overload.emit(1)
        self.Signal_OneParameter_Overload[str].emit("abc")
        self.Signal_TwoParameters.emit(1,"abc")
        self.Signal_TwoParameters_Overload.emit(1,2)
        self.Signal_TwoParameters_Overload[int, str].emit(1,"abc")

    @pyqtSlot()
    def setValue_NoParameters(self): 
        print('''无参数槽方法''')
        pass
    @pyqtSlot(int)
    def setValue_OneParameter(self,nIndex): 
       print( '''一个参数(整数)槽方法''', nIndex)
       pass
    @pyqtSlot(str)
    def setValue_OneParameter_String(self,szIndex): 
       print( '''一个参数(字符串)的槽方法''', szIndex)
       pass
    ##@pyqtSlot(int,int)
    def setValue_TwoParameters(self,x,y): 
       print( '二个参数(整数,整数)槽方法', x, y)
       pass
   ## @pyqtSlot(int,str) 加不加槽修饰没看出来啥区别。。。
    def setValue_TwoParameters_String(self,x,yx): 
       print('二个参数(整数,字符串)槽方法', x, yx)
       pass






app = QApplication(sys.argv) 
widget = MyWidget() 
widget.show() 
widget.Signal_NoParameters.connect(widget.setValue_NoParameters,Qt.QueuedConnection)
widget.Signal_OneParameter.connect(widget.setValue_OneParameter,Qt.QueuedConnection) 
widget.Signal_OneParameter_Overload[int].connect(widget.setValue_OneParameter,Qt.QueuedConnection) 
widget.Signal_OneParameter_Overload[str].connect(widget.setValue_OneParameter_String,Qt.QueuedConnection)
widget.Signal_TwoParameters.connect(widget.setValue_TwoParameters,Qt.QueuedConnection)
widget.Signal_TwoParameters_Overload[int,int].connect(widget.setValue_TwoParameters,Qt.QueuedConnection) 
widget.Signal_TwoParameters_Overload[int,str].connect(widget.setValue_TwoParameters_String,Qt.QueuedConnection)

sys.exit(app.exec_())