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keyPressEvent() 方法不適用於 PyQt5/Python 3+

[英]keyPressEvent() method doesn't work for PyQt5 / Python 3+

 原文  2016-11-05 21:43:41  8   3    python/ qt/ python-3.x/ pyqt5

問題描述

我是python的新手。 我使用“Qt Designer”設計了一個簡單的計算器應用程序，然后使用“pyuic5”將“ui”文件轉換為“py”。

但是當我添加了 keyPressEvent() 方法時，該方法不起作用。 我不知道為什么。 我已經嘗試使用 setFocus() 方法來解決這個問題，但失敗了。

有人可以幫我嗎？

請在下面檢查我的代碼：

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_())

3 個解決方案

解決方案1
 2 已采納  2016-11-07 13:41:52

先生，我找不到你的語法具體是什么錯誤，所以我編輯了你的代碼以盡可能地與你的代碼相似。

這是您的代碼進行了一些修改，看看它是否適合您。

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_())

希望它有效^^

解決方案2
 1  2016-11-05 22:00:44

看起來您需要將每個小部件與一個事件連接起來。 GUI 是事件驅動的編程。 正如您所看到的，他們只是坐在那里看着您，直到用戶采取某些行動為止，您（程序員）有責任定義每個行動會發生什么。

例如，您的計算器有按鈕。 我假設當您按下數字按鈕時，您希望該數字顯示在代表顯示器的文本框中。 如果是這樣，那么您需要處理“clicked”事件。 類似的東西

 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 '

我見過的最好的介紹教程之一是Here 。 我通常讓我所有的 Python 課程都通過它來開始學習 GUI 編程。

解決方案3
 0  2021-08-04 10:22:26

我也有這個問題。 在 setupUI 函數中使用此代碼：

MainWindow.keyPressEvent = self.keyPressEvent

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