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_())