问题
I am trying to find open ports and add them to my menu. Right now, what I succeed having an action to my menu (like, "find ports"), and only if it's clicked - it will connect to my function that gets all free ports. Unfortunately, that's not what I am looking for.
I want to click on the menu title, and get all port in my menu. Below is the code I have:
This is the GUI part:
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(150, 150)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.portList = QtWidgets.QPushButton(self.centralwidget)
self.portList.setGeometry(QtCore.QRect(10, 50, 65, 23))
self.portList.setObjectName("portList")
self.productMenu=QtWidgets.QMenu(self.centralwidget)
# self.productMenu.addAction("Find Port") <-------- If I add this, then it works when I click on "Find Port"
self.portList.setMenu(self.productMenu)
MainWindow.setCentralWidget(self.centralwidget)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "GUI"))
self.portList.setText(_translate("MainWindow", "Ports"))
And this is where I run my functions:
from PyQt5 import QtWidgets, QtCore, QtGui
from test1 import Ui_MainWindow
import serial.tools.list_ports
import sys
class ApplicationWindow(QtWidgets.QMainWindow):
def __init__(self):
super(ApplicationWindow, self).__init__()
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.ui.productMenu.triggered.connect(self.findPort)
self.ui.portList.clicked.connect(self.findPort)
###I tried both lines above, but it doesn't connect to the function###
def findPort(self):
comPorts = list(serial.tools.list_ports.comports())
print("clicked!")
for counter in comPorts:
strPort=str(counter)
print(strPort)
self.ui.productMenu.addAction(strPort)
def portClick(self,action):
print(action.text())
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
application = ApplicationWindow()
application.show()
sys.exit(app.exec_())
How can I get the findport function to connect by pressing the title of the menu, and get it updated immediately with the free ports?
回答1:
You have to use the aboutToShow signal:
self.ui.productMenu.aboutToShow.connect(self.findPort)
来源：https://stackoverflow.com/questions/60134879/connect-a-function-when-menu-title-is-clicked