PyQT5 （八十四） 信号和槽 --使用lambda表达式为槽函数传递参数

PyQt5信号和槽 --使用lambda表达式为槽函数传递参数

Lambda表达式：匿名函数，也就是没有名字的函数
fun = lambda：print("hello world")

fun()

fun1 = lambda s,y:print(x,y)
fun1("a","b")

import sys

from PyQt5.QtCore import QObject, pyqtSignal
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import QHBoxLayout, QPushButton, QMessageBox, QApplication, QVBoxLayout, QWidget, 
    QLabel, QMainWindow

'''
PyQt5信号和槽 --使用lambda表达式为槽函数传递参数

Lambda表达式：匿名函数，也就是没有名字的函数
fun = lambda：print("hello world")

fun()

fun1 = lambda s,y:print(x,y)
fun1("a","b")

'''


class LambdaSlotArgDemo(QMainWindow):

    def __init__(self):
        super().__init__()
        self.setWindowTitle("使用lambda表达式为槽函数传递参数")

        button1 = QPushButton("按钮1")
        button2 = QPushButton("按钮2")
        layout = QHBoxLayout()
        layout.addWidget(button1)
        layout.addWidget(button2)
        mainframe = QWidget()
        mainframe.setLayout(layout)
        self.setCentralWidget(mainframe)
        button1.clicked.connect(lambda :self.onButtonClick(10,20))
        a = 19
        button2.clicked.connect(lambda :self.onButtonClick(10,a))
        button1.clicked.connect(lambda :QMessageBox.information(self,'结果','单击了button1'))


    def onButtonClick(self,m,n):
        print("m+n:",m+n)
        QMessageBox.information(self,'结果',str(m+n))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = LambdaSlotArgDemo()
    win.show()
    sys.exit(app.exec_())