信号发送。

#!/usr/bin/python3
# -*- coding: utf-8 -*-

"""
ZetCode PyQt5 tutorial

In this example, we show how to
emit a custom signal.

Author: Jan Bodnar
Website: zetcode.com
Last edited: August 2017
"""

import sys
from PyQt5.QtCore import pyqtSignal, QObject
from PyQt5.QtWidgets import QMainWindow, QApplication


class Communicate(QObject):

    closeApp = pyqtSignal()


class Example(QMainWindow):

    def __init__(self):
        super().__init__()

        self.initUI()


    def initUI(self):

        self.c = Communicate()
        self.c.closeApp.connect(self.close)

        self.setGeometry(300, 300, 290, 150)
        self.setWindowTitle('Emit signal')
        self.show()


    def mousePressEvent(self, event):

        self.c.closeApp.emit()#这行代码的作用是手动触发（或“发出”）


if __name__ == '__main__':

    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

我们创建了一个叫 closeApp 的信号，这个信号会在鼠标按下的时候触发，事件与 QMainWindow 绑定。

text

class Communicate(QObject):

    closeApp = pyqtSignal()

Communicate 类创建了一个 pyqtSignal() 属性的信号。

text

self.c = Communicate()
self.c.closeApp.connect(self.close)

closeApp 信号 QMainWindow 的 close() 方法绑定。

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def mousePressEvent(self, event):

    self.c.closeApp.emit()