专注于只读QLineEdit小部件的PyQt5

我有3个QLineEdit小部件，它们是只读的，可以监听关键事件。我想让用户选择他要使用的QLineEdit (因为它将是一个快捷方式设置窗口)。在只读模式下，该窗口小部件不可单击时出现。有没有办法让它变得可点击，或者在不使用readonly的情况下做同样的事情？

我在Qt Designer中写的代码。

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(392, 290)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(140, 70, 113, 21))
        self.lineEdit.setReadOnly(True)
        self.lineEdit.setAlignment(QtCore.Qt.AlignCenter)
        MainWindow.keyPressEvent = self.newOnkeyPressEvent1

        self.lineEdit.setObjectName("lineEdit")
        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_2.setGeometry(QtCore.QRect(140, 150, 113, 21))
        self.lineEdit_2.setReadOnly(True)
        self.lineEdit_2.setAlignment(QtCore.Qt.AlignCenter)
        MainWindow.keyPressEvent = self.newOnkeyPressEvent2
        self.lineEdit_2.setObjectName("lineEdit_2")

        self.lineEdit_3 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_3.setGeometry(QtCore.QRect(140, 220, 113, 21))
        self.lineEdit_3.setReadOnly(True)
        self.lineEdit_3.setAlignment(QtCore.Qt.AlignCenter)
        MainWindow.keyPressEvent = self.newOnkeyPressEvent3
        self.lineEdit_3.setObjectName("lineEdit_3")

        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def newOnkeyPressEvent1(self, event):
        key = event.key()
        modifiers = int(event.modifiers())
        keyname = QtGui.QKeySequence(modifiers + key).toString()
        print(keyname)
        self.lineEdit.setText(str(keyname))

    def newOnkeyPressEvent2(self, event):
        key = event.key()
        modifiers = int(event.modifiers())
        keyname = QtGui.QKeySequence(modifiers + key).toString()
        print(keyname)
        self.lineEdit_2.setText(str(keyname))

    def newOnkeyPressEvent3(self, event):
        key = event.key()
        modifiers = int(event.modifiers())
        keyname = QtGui.QKeySequence(modifiers + key).toString()
        print(keyname)
        self.lineEdit_3.setText(str(keyname))

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

您需要确定哪个lineedit在self.centralwidget.focusWidget()中处于焦点位置。下面是完整的工作代码：

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(392, 290)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(140, 70, 113, 21))
        self.lineEdit.setReadOnly(True)
        self.lineEdit.setAlignment(QtCore.Qt.AlignCenter)

        MainWindow.keyPressEvent = self.newOnkeyPressEvent

        self.lineEdit.setObjectName("lineEdit")
        self.lineEdit_2 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_2.setGeometry(QtCore.QRect(140, 150, 113, 21))
        self.lineEdit_2.setReadOnly(True)
        self.lineEdit_2.setAlignment(QtCore.Qt.AlignCenter)
        self.lineEdit_2.setObjectName("lineEdit_2")

        self.lineEdit_3 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_3.setGeometry(QtCore.QRect(140, 220, 113, 21))
        self.lineEdit_3.setReadOnly(True)
        self.lineEdit_3.setAlignment(QtCore.Qt.AlignCenter)

        self.lineEdit_3.setObjectName("lineEdit_3")

        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def newOnkeyPressEvent(self, event):
        key = event.key()
        modifiers = int(event.modifiers())
        keyname = QtGui.QKeySequence(modifiers + key).toString()
        print(keyname)
        lineEdit = self.centralwidget.focusWidget()
        lineEdit.setText(str(keyname))

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

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