Qt.Key_Space不触发

如何解决Qt.Key_Space不触发

尝试创建计时器时，我想使用Space激活我创建的计时器功能：

    def keyReleaseEvent(self,e):
        # if e.key() == Qt.Key_Space:
        if (e.key() == Qt.Key_T):
            self.isCounting = not self.isCounting
            if self.isCounting == True:
                self.timerStart = time.time()
            else:
                #return elapsed time
                print(time.time() - self.timerStart)

但是，这不起作用。我使用的其他任何按钮，即“ t”，“ 0”等...起作用。缺省情况下是否还有其他使用Space的东西，或者什么可能导致此问题？

MRE：

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

import time
import sys

class Listener(QObject):
    def __init__(self,button):
        super().__init__(button)
        self._button = button
        self.button.installEventFilter(self)

    @property
    def button(self):
        return self._button

    def eventFilter(self,obj,event):
        if obj is self.button and event.type() == QEvent.KeyPress:
            return True
        return super().eventFilter(obj,event)

class App(QMainWindow):

    def __init__(self):
      super().__init__()
      self.initUI()

    def initUI(self):
        self.SCREEN_WIDTH = 1920
        self.SCREEN_HEIGHT = 1080
        self.WIN_HEIGHT = self.SCREEN_HEIGHT*.8
        self.WIN_WIDTH = self.SCREEN_WIDTH/2
        self.isCounting = False
        self.timerStart = time.time()
        self.setGeometry(self.SCREEN_WIDTH/2-self.WIN_WIDTH/2,self.SCREEN_HEIGHT/2-self.WIN_HEIGHT/2,self.WIN_WIDTH,self.WIN_HEIGHT)
        self.setWindowTitle('Timer')

        scrambleButton = QPushButton(self)
        scrambleButton.setText('New Scramble')
        scrambleButtonGeometry = QRect(self.WIN_WIDTH/2-65,80,130,35)
        scrambleButton.setGeometry(scrambleButtonGeometry)
        scrambleButton.clicked.connect(lambda: print('hey'))
        listener = Listener(scrambleButton)

        self.show()

        
    def keyReleaseEvent(self,e):
    #   if e.key() == Qt.Key_Space: 
      if (e.key() == Qt.Key_T):
          self.isCounting = not self.isCounting
          if self.isCounting == True:
              self.timerStart = time.time()
          else:
              #return elapsed time
              print(time.time() - self.timerStart)
def main():
    app = QApplication(sys.argv)
    win = App()
    sys.exit(app.exec_())
    
if __name__ == '__main__':
    main()

解决方法

问题是，尽管KeyPress事件没有发送到QPushButton，但是它不会被忽略，因此不会通知窗口。解决方案是忽略eventFilter中的keyPress和keyRelease：

def eventFilter(self,obj,event):
    if obj is self.button and event.type() == QEvent.KeyPress:
        event.ignore()
        return True
    if obj is self.button and event.type() == QEvent.KeyRelease:
        event.ignore()
    return super().eventFilter(obj,event)

一个更简单的解决方案是使用QShortcut：

    # ...
    self.show()

    shorcut = QShortcut(Qt.Key_Space,self,autoRepeat=False)
    shorcut.activated.connect(self.process_time)

def process_time(self):
    self.isCounting = not self.isCounting
    if self.isCounting == True:
        self.timerStart = time.time()
    else:
        print(time.time() - self.timerStart)