可选信号参数

Optional Signal Arguments

我有一个具有默认关键字参数的函数。我在实现这个时遇到了麻烦,因为我不断收到一个错误,如果我的信号有两个参数,那么我需要传递这两个参数。有什么解决办法吗?

class Controller(QWidget):
    trigger = pyqtSignal(str, str)
    def __init__(self):
        self.trigger.connect(self.myfunc)

    @pyqtSlot(str, str)
    def function(argument, optional_argument=''):
         do something

c = Controller()
c.trigger.emit('Hello', 'World') # This works
c.trigger.emit('Hello')  # This fails and says I need 2 arguments

除了重载信号支持的类型外,还必须使连接指向连接中的签名:

import sys
from PyQt5 import QtCore


class Controller(QtCore.QObject):
    trigger = QtCore.pyqtSignal([str], [str, str])

    def __init__(self):
        super(Controller, self).__init__()
        self.trigger[str].connect(self.function)
        self.trigger[str, str].connect(self.function)

    @QtCore.pyqtSlot(str)
    @QtCore.pyqtSlot(str, str)
    def function(self, argument,  optional_argument=''):
        print(argument, optional_argument)


def main():
    app = QtCore.QCoreApplication(sys.argv)
    c = Controller()
    c.trigger[str].emit('Hello')
    c.trigger[str, str].emit('Hello', 'World')
    QtCore.QTimer.singleShot(100, QtCore.QCoreApplication.quit)
    sys.exit(app.exec_())


if __name__ == "__main__":
     main()