keyPressEvent（）方法不适用于PyQt5/Python 3+

我是python的新手。我使用“Qt Designer”设计了一个简单的计算器应用程序，然后使用“pyuic5”将“ui”文件转换为“py”。keyPressEvent（）方法不适用于PyQt5/Python 3+

但是当我添加keyPressEvent（）方法时，该方法不起作用。我不知道为什么。我试着用setFocus（）方法来解决这个问题，但失败了。

任何人都可以帮助我吗？

请检查下面我的代码：

from PyQt5 import QtCore, QtGui, QtWidgets 
import sys 


class Ui_MainWindow(object): 
    def setupUi(self, MainWindow): 
     MainWindow.setMinimumSize(QtCore.QSize(330, 280)) 
     MainWindow.setMaximumSize(QtCore.QSize(330, 280)) 

     self.centralwidget = QtWidgets.QWidget(MainWindow) 


     self.lineEdit_display = QtWidgets.QLineEdit(self.centralwidget) 
     self.lineEdit_display.setGeometry(QtCore.QRect(10, 0, 311, 41)) 
     font = QtGui.QFont() 
     font.setPointSize(14) 
     font.setBold(True) 
     font.setWeight(75) 
     self.lineEdit_display.setFont(font) 
     self.lineEdit_display.setMaxLength(15) 
     self.lineEdit_display.setAlignment(QtCore.Qt.AlignRight|QtCore.Qt.AlignTrailing|QtCore.Qt.AlignVCenter) 
     self.lineEdit_display.setReadOnly(True) 


     self.pButton_0 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_0.setGeometry(QtCore.QRect(10, 200, 51, 41)) 
     self.pButton_0.setCursor(QtGui.QCursor(QtCore.Qt.ArrowCursor)) 

     self.pButton_00 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_00.setGeometry(QtCore.QRect(70, 200, 51, 41)) 

     self.pButton_dot = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_dot.setGeometry(QtCore.QRect(130, 200, 51, 41)) 

     self.pButton_1 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_1.setGeometry(QtCore.QRect(10, 150, 51, 41)) 

     self.pButton_2 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_2.setGeometry(QtCore.QRect(70, 150, 51, 41)) 

     self.pButton_3 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_3.setGeometry(QtCore.QRect(130, 150, 51, 41)) 

     self.pButton_4 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_4.setGeometry(QtCore.QRect(10, 100, 51, 41)) 

     self.pButton_5 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_5.setGeometry(QtCore.QRect(70, 100, 51, 41)) 

     self.pButton_6 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_6.setGeometry(QtCore.QRect(130, 100, 51, 41)) 

     self.pButton_7 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_7.setGeometry(QtCore.QRect(10, 50, 51, 41)) 

     self.pButton_8 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_8.setGeometry(QtCore.QRect(70, 50, 51, 41)) 

     self.pButton_9 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_9.setGeometry(QtCore.QRect(130, 50, 51, 41)) 

     self.pButton_add = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_add.setGeometry(QtCore.QRect(210, 50, 51, 41)) 

     self.pButton_subtract = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_subtract.setGeometry(QtCore.QRect(210, 100, 51, 41)) 

     self.pButton_multiplication = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_multiplication.setGeometry(QtCore.QRect(210, 150, 51, 41)) 

     self.pButton_divide = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_divide.setGeometry(QtCore.QRect(210, 200, 51, 41)) 

     self.pButton_equal = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_equal.setGeometry(QtCore.QRect(270, 150, 51, 91)) 

     self.pButton_ac = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_ac.setGeometry(QtCore.QRect(270, 50, 51, 91)) 
     font = QtGui.QFont() 
     font.setPointSize(14) 
     self.pButton_ac.setFont(font) 
     self.pButton_ac.setDefault(True) 


     MainWindow.setCentralWidget(self.centralwidget) 
     self.menubar = QtWidgets.QMenuBar(MainWindow) 
     self.menubar.setGeometry(QtCore.QRect(0, 0, 330, 27)) 
     self.menuMain = QtWidgets.QMenu(self.menubar) 
     MainWindow.setMenuBar(self.menubar) 
     self.actionExit = QtWidgets.QAction(MainWindow) 
     self.actionAbout = QtWidgets.QAction(MainWindow) 
     self.menuMain.addAction(self.actionExit) 
     self.menuMain.addAction(self.actionAbout) 
     self.menubar.addAction(self.menuMain.menuAction()) 

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

    def retranslateUi(self, MainWindow): 
     _translate = QtCore.QCoreApplication.translate 
     MainWindow.setWindowTitle(_translate("MainWindow", "Simple Calculator")) 
     MainWindow.setToolTip(_translate("MainWindow", "Simple Calculator")) 
     self.pButton_0.setToolTip(_translate("MainWindow", "0")) 
     self.pButton_0.setText(_translate("MainWindow", "0")) 
     self.pButton_00.setToolTip(_translate("MainWindow", "00")) 
     self.pButton_00.setText(_translate("MainWindow", "00")) 
     self.pButton_dot.setToolTip(_translate("MainWindow", ".")) 
     self.pButton_dot.setText(_translate("MainWindow", ".")) 
     self.pButton_1.setToolTip(_translate("MainWindow", "1")) 
     self.pButton_1.setText(_translate("MainWindow", "1")) 
     self.pButton_2.setToolTip(_translate("MainWindow", "2")) 
     self.pButton_2.setText(_translate("MainWindow", "2")) 
     self.pButton_3.setToolTip(_translate("MainWindow", "3")) 
     self.pButton_3.setText(_translate("MainWindow", "3")) 
     self.pButton_4.setToolTip(_translate("MainWindow", "4")) 
     self.pButton_4.setText(_translate("MainWindow", "4")) 
     self.pButton_5.setToolTip(_translate("MainWindow", "5")) 
     self.pButton_5.setText(_translate("MainWindow", "5")) 
     self.pButton_6.setToolTip(_translate("MainWindow", "6")) 
     self.pButton_6.setText(_translate("MainWindow", "6")) 
     self.pButton_7.setToolTip(_translate("MainWindow", "7")) 
     self.pButton_7.setText(_translate("MainWindow", "7")) 
     self.pButton_8.setToolTip(_translate("MainWindow", "8")) 
     self.pButton_8.setText(_translate("MainWindow", "8")) 
     self.pButton_9.setToolTip(_translate("MainWindow", "9")) 
     self.pButton_9.setText(_translate("MainWindow", "9")) 
     self.pButton_add.setToolTip(_translate("MainWindow", "+")) 
     self.pButton_add.setText(_translate("MainWindow", "+")) 
     self.pButton_subtract.setToolTip(_translate("MainWindow", "-")) 
     self.pButton_subtract.setText(_translate("MainWindow", "-")) 
     self.pButton_multiplication.setToolTip(_translate("MainWindow", "\N{MULTIPLICATION SIGN}")) 
     self.pButton_multiplication.setText(_translate("MainWindow", "\N{MULTIPLICATION SIGN}")) 
     self.pButton_divide.setToolTip(_translate("MainWindow", "\N{DIVISION SIGN}")) 
     self.pButton_divide.setText(_translate("MainWindow", "\N{DIVISION SIGN}")) 
     self.pButton_equal.setToolTip(_translate("MainWindow", "=")) 
     self.pButton_equal.setText(_translate("MainWindow", "=")) 
     self.pButton_ac.setToolTip(_translate("MainWindow", "AC")) 
     self.pButton_ac.setText(_translate("MainWindow", "AC")) 
     self.lineEdit_display.setToolTip(_translate("MainWindow", "Display")) 
     self.lineEdit_display.setText(_translate("MainWindow", "0")) 
     self.menuMain.setTitle(_translate("MainWindow", "Mai&n")) 
     self.actionExit.setText(_translate("MainWindow", "&Exit")) 
     self.actionAbout.setText(_translate("MainWindow", "&About")) 

    def keyPressEvent(self, e): 
     print(e.key()) 

if __name__ == "__main__": 

    app = QtWidgets.QApplication(sys.argv) 

    MainWindow = QtWidgets.QMainWindow() 
    ui = Ui_MainWindow() 
    ui.setupUi(MainWindow) 
    MainWindow.show() 

    MainWindow.setFocus() #TRYING TO SET FOCUS FOR keyPressEvent 

    sys.exit(app.exec_())

来源

2016-11-05 smearumi

先生，我找不到具体的语法错误是什么，所以我编辑了你的代码，尽可能保持与你的代码非常相似。

这里是你的代码工作一些修改，看看它是否适合你。

from PyQt5 import QtCore, QtGui, QtWidgets 
import sys 

from PyQt5.QtWidgets import QAction 
from PyQt5.QtWidgets import QLineEdit 
from PyQt5.QtWidgets import QMainWindow 
from PyQt5.QtWidgets import QMenu 
from PyQt5.QtWidgets import QMenuBar 
from PyQt5.QtWidgets import QPushButton 
from PyQt5.QtWidgets import QWidget 


class Ui_MainWindow(QMainWindow): 

    def __init__(self): 
     super(Ui_MainWindow, self).__init__() 
     # self.setupUi() 

    def setupUi(self): 
     self.setMinimumSize(QtCore.QSize(330, 280)) 
     self.setMaximumSize(QtCore.QSize(330, 280)) 

     self.centralwidget = QWidget() 


     self.lineEdit_display = QLineEdit(self.centralwidget) 
     self.lineEdit_display.setGeometry(QtCore.QRect(10, 0, 311, 41)) 
     font = QtGui.QFont() 
     font.setPointSize(14) 
     font.setBold(True) 
     font.setWeight(75) 
     self.lineEdit_display.setFont(font) 
     self.lineEdit_display.setMaxLength(15) 
     self.lineEdit_display.setAlignment(QtCore.Qt.AlignRight|QtCore.Qt.AlignTrailing|QtCore.Qt.AlignVCenter) 
     self.lineEdit_display.setReadOnly(True) 


     self.pButton_0 = QPushButton(self.centralwidget) 
     self.pButton_0.setGeometry(QtCore.QRect(10, 200, 51, 41)) 
     self.pButton_0.setCursor(QtGui.QCursor(QtCore.Qt.ArrowCursor)) 

     self.pButton_00 = QPushButton(self.centralwidget) 
     self.pButton_00.setGeometry(QtCore.QRect(70, 200, 51, 41)) 

     self.pButton_dot = QPushButton(self.centralwidget) 
     self.pButton_dot.setGeometry(QtCore.QRect(130, 200, 51, 41)) 

     self.pButton_1 = QPushButton(self.centralwidget) 
     self.pButton_1.setGeometry(QtCore.QRect(10, 150, 51, 41)) 

     self.pButton_2 = QPushButton(self.centralwidget) 
     self.pButton_2.setGeometry(QtCore.QRect(70, 150, 51, 41)) 

     self.pButton_3 = QPushButton(self.centralwidget) 
     self.pButton_3.setGeometry(QtCore.QRect(130, 150, 51, 41)) 

     self.pButton_4 = QPushButton(self.centralwidget) 
     self.pButton_4.setGeometry(QtCore.QRect(10, 100, 51, 41)) 

     self.pButton_5 = QPushButton(self.centralwidget) 
     self.pButton_5.setGeometry(QtCore.QRect(70, 100, 51, 41)) 

     self.pButton_6 = QPushButton(self.centralwidget) 
     self.pButton_6.setGeometry(QtCore.QRect(130, 100, 51, 41)) 

     self.pButton_7 = QPushButton(self.centralwidget) 
     self.pButton_7.setGeometry(QtCore.QRect(10, 50, 51, 41)) 

     self.pButton_8 = QPushButton(self.centralwidget) 
     self.pButton_8.setGeometry(QtCore.QRect(70, 50, 51, 41)) 

     self.pButton_9 = QPushButton(self.centralwidget) 
     self.pButton_9.setGeometry(QtCore.QRect(130, 50, 51, 41)) 

     self.pButton_add = QPushButton(self.centralwidget) 
     self.pButton_add.setGeometry(QtCore.QRect(210, 50, 51, 41)) 

     self.pButton_subtract = QPushButton(self.centralwidget) 
     self.pButton_subtract.setGeometry(QtCore.QRect(210, 100, 51, 41)) 

     self.pButton_multiplication = QPushButton(self.centralwidget) 
     self.pButton_multiplication.setGeometry(QtCore.QRect(210, 150, 51, 41)) 

     self.pButton_divide = QPushButton(self.centralwidget) 
     self.pButton_divide.setGeometry(QtCore.QRect(210, 200, 51, 41)) 

     self.pButton_equal = QPushButton(self.centralwidget) 
     self.pButton_equal.setGeometry(QtCore.QRect(270, 150, 51, 91)) 

     self.pButton_ac = QPushButton(self.centralwidget) 
     self.pButton_ac.setGeometry(QtCore.QRect(270, 50, 51, 91)) 
     font = QtGui.QFont() 
     font.setPointSize(14) 
     self.pButton_ac.setFont(font) 
     self.pButton_ac.setDefault(True) 

     self.setCentralWidget(self.centralwidget) 
     self.menubar = QMenuBar(self) 
     self.menubar.setGeometry(QtCore.QRect(0, 0, 330, 27)) 
     self.menuMain = QMenu(self.menubar) 
     self.setMenuBar(self.menubar) 
     self.actionExit = QAction(self) 
     self.actionAbout = QAction(self) 
     self.menuMain.addAction(self.actionExit) 
     self.menuMain.addAction(self.actionAbout) 
     self.menubar.addAction(self.menuMain.menuAction()) 

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

    def retranslateUi(self): 
     _translate = QtCore.QCoreApplication.translate 
     self.setWindowTitle(_translate("MainWindow", "Simple Calculator")) 
     self.setToolTip(_translate("MainWindow", "Simple Calculator")) 
     self.pButton_0.setToolTip(_translate("MainWindow", "0")) 
     self.pButton_0.setText(_translate("MainWindow", "0")) 
     self.pButton_00.setToolTip(_translate("MainWindow", "00")) 
     self.pButton_00.setText(_translate("MainWindow", "00")) 
     self.pButton_dot.setToolTip(_translate("MainWindow", ".")) 
     self.pButton_dot.setText(_translate("MainWindow", ".")) 
     self.pButton_1.setToolTip(_translate("MainWindow", "1")) 
     self.pButton_1.setText(_translate("MainWindow", "1")) 
     self.pButton_2.setToolTip(_translate("MainWindow", "2")) 
     self.pButton_2.setText(_translate("MainWindow", "2")) 
     self.pButton_3.setToolTip(_translate("MainWindow", "3")) 
     self.pButton_3.setText(_translate("MainWindow", "3")) 
     self.pButton_4.setToolTip(_translate("MainWindow", "4")) 
     self.pButton_4.setText(_translate("MainWindow", "4")) 
     self.pButton_5.setToolTip(_translate("MainWindow", "5")) 
     self.pButton_5.setText(_translate("MainWindow", "5")) 
     self.pButton_6.setToolTip(_translate("MainWindow", "6")) 
     self.pButton_6.setText(_translate("MainWindow", "6")) 
     self.pButton_7.setToolTip(_translate("MainWindow", "7")) 
     self.pButton_7.setText(_translate("MainWindow", "7")) 
     self.pButton_8.setToolTip(_translate("MainWindow", "8")) 
     self.pButton_8.setText(_translate("MainWindow", "8")) 
     self.pButton_9.setToolTip(_translate("MainWindow", "9")) 
     self.pButton_9.setText(_translate("MainWindow", "9")) 
     self.pButton_add.setToolTip(_translate("MainWindow", "+")) 
     self.pButton_add.setText(_translate("MainWindow", "+")) 
     self.pButton_subtract.setToolTip(_translate("MainWindow", "-")) 
     self.pButton_subtract.setText(_translate("MainWindow", "-")) 
     self.pButton_multiplication.setToolTip(_translate("MainWindow", "\N{MULTIPLICATION SIGN}")) 
     self.pButton_multiplication.setText(_translate("MainWindow", "\N{MULTIPLICATION SIGN}")) 
     self.pButton_divide.setToolTip(_translate("MainWindow", "\N{DIVISION SIGN}")) 
     self.pButton_divide.setText(_translate("MainWindow", "\N{DIVISION SIGN}")) 
     self.pButton_equal.setToolTip(_translate("MainWindow", "=")) 
     self.pButton_equal.setText(_translate("MainWindow", "=")) 
     self.pButton_ac.setToolTip(_translate("MainWindow", "AC")) 
     self.pButton_ac.setText(_translate("MainWindow", "AC")) 
     self.lineEdit_display.setToolTip(_translate("MainWindow", "Display")) 
     self.lineEdit_display.setText(_translate("MainWindow", "0")) 
     self.menuMain.setTitle(_translate("MainWindow", "Mai&n")) 
     self.actionExit.setText(_translate("MainWindow", "&Exit")) 
     self.actionAbout.setText(_translate("MainWindow", "&About")) 

    def keyPressEvent(self, e): 
     print(e.key()) 

if __name__ == "__main__": 

    app = QtWidgets.QApplication(sys.argv) 

    ui = Ui_MainWindow() 
    ui.setupUi() 
    ui.show() 

    sys.exit(app.exec_())

希望工程^^

来源

2016-11-07 13:41:52 yurisnm

在这里，您将只需要在keyPressEvent中根据需要对待逻辑。例如比较“if e.key（）== Qt.Key_1”.... – yurisnm

非常感谢。它适用于整个代码，包括鼠标事件。现在我可以使用鼠标事件和键盘事件了！ :)） – smearumi

它看起来像你需要每个插件与事件相连接。 GUI是事件驱动的编程。正如你所看到的，他们只是坐在那里看着你，直到用户采取一些行动，并且你（程序员）有责任定义每个动作发生的事情。

例如，您有计算器的按钮。我假定当你按下一个数字按钮时，你想让这个数字出现在代表显示的文本框中。如果是这样，那么你需要处理“点击”事件。类似的东西

self.pButton_9.clicked.connect(self.click_9) # connects button to action by defining a callback - an action to handle the event. 

def click_9(self): 
    self.lineEdit_display.text += '9 '

我见过的最好的介绍教程之一是Here。我通常会让所有的Python类都开始学习GUI编程。

来源

2016-11-05 22:00:44 zenlc2000

对于鼠标事件，我已经比赛我的代码。由于代码的大小，我没有在这里发帖。我使用了pressed .connect（）和released.connect（）。但是我需要Numpad/Keyboard的keyPresEvent方法。（例如，当我按下“Num 9”键时，它将调用click_9功能）。 – smearumi

keyPressEvent（）方法不适用于PyQt5/Python 3+

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