在 QWidget 中实现 keyPressEvent

我有一个带有继续按钮的 QDialog 窗口。继续按钮是默认按钮，因为每当我按下回车键时，就会按下继续按钮。我发现了一些奇怪的事情：当我按三下回车键时，继续按钮按了三下。然而，当我第四次按下它时，整个窗口都会关闭。我在关闭窗口的继续按钮正下方有一个取消按钮，但我没有将取消按钮设置为默认按钮或其他任何按钮。

我想覆盖keyPressEvent这样每当我在窗口中时，输入按钮将始终连接到继续按钮。

这就是我现在所拥有的：

class ManualBalanceUI(QtGui.QWidget):
    keyPressed = QtCore.pyqtSignal()

    def __init__(self, cls):
        super(QtGui.QWidget, self).__init__()
        self.window = QtGui.QDialog(None, QtCore.Qt.WindowSystemMenuHint)
        self.ui = uic.loadUi('ManualBalanceUI.ui', self.window)
        self.keyPressed.connect(self.on_key)

    def keyPressEvent(self, event):
        super(ManualBalanceUI, self).keyPressEvent(event)
        self.keyPressed.emit(event) 

    def on_key(self, event):
        if event.key() == QtCore.Qt.Key_Enter and self.ui.continueButton.isEnabled():
            self.proceed()  # this is called whenever the continue button is pressed
        elif event.key() == QtCore.Qt.Key_Q:
            self.window.close()  # a test I implemented to see if pressing 'Q' would close the window
     def proceed(self):
         ...
     ...

然而，目前看来这并没有起到任何作用。按“Q”不会关闭窗口，而且我无法真正判断“回车”键是否有效。

我事先看过这个问题：PyQt 连接到 KeyPressEvent https://stackoverflow.com/questions/27475940/pyqt-connect-to-keypressevent

我还查看了 SourceForge 上的所有文档。任何帮助将不胜感激！

您可以采取两种方法，一种是简单地重新实现 keyPressevent，无需任何花哨的工作。像这样

from PyQt4 import QtCore, QtGui
import sys

class Example(QtGui.QWidget):
    def __init__(self):
        super(Example, self).__init__()
        self.setGeometry(300, 300, 250, 150)
        self.show()

    def keyPressEvent(self, event):
        if event.key() == QtCore.Qt.Key_Q:
            print "Killing"
            self.deleteLater()
        elif event.key() == QtCore.Qt.Key_Enter:
            self.proceed()
        event.accept()

    def proceed(self):
        print "Call Enter Key"

def main():
    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

或者当您尝试使用信号时，如果您缺少正确实现此信号的情况，这里是更新版本。

class Example(QtGui.QWidget):
    keyPressed = QtCore.pyqtSignal(QtCore.QEvent)
    def __init__(self):
        super(Example, self).__init__()
        self.setGeometry(300, 300, 250, 150)
        self.show()
        self.keyPressed.connect(self.on_key)

    def keyPressEvent(self, event):
        super(Example, self).keyPressEvent(event)
        self.keyPressed.emit(event) 

    def on_key(self, event):
        if event.key() == QtCore.Qt.Key_Enter and self.ui.continueButton.isEnabled():
            self.proceed()  # this is called whenever the continue button is pressed
        elif event.key() == QtCore.Qt.Key_Q:
            print "Killing"
            self.deleteLater()  # a test I implemented to see if pressing 'Q' would close the window

    def proceed(self):
        print "Call Enter Key"

def main():
    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()