Python 类中的公共(public)方法？

Question

我删除了代码以更好地理解我的问题。问题是是否有某种方法如何创建公共(public)方法之类的东西，以及我如何或是否完全误解了 OOP 概念。

我有一个主要类PlayerWindow，它只播放视频。然后是 ControlsWindow 类，仅用于我的开发、测试和维护目的(在全屏关闭时启动)。因此，我特别想成为它。无法弄清楚如何从 ControlsWindow 类中调用方法 play() 以及从内部调用方法，因为当我使用以下实例初始化 ControlsWindow 时PlayerWindow 然后我得到无限循环。

class ControlsWindow(QtGui.QWidget):

  def __init__(self):
    super(ControlsWindow, self).__init__()

    self.playPauseButton = QtGui.QPushButton('Play', self)
    self.show()


class PlayerWindow(QtGui.QWidget):

  def __init__(self):
    super(PlayerWindow, self).__init__()

    # ...
    self.mediaPlayer = self.playerInstance.media_player_new() 
    # ... 
    self.initUI()
    self.play()

  def initUI(self):
    # ...
    self.show()
    self.controls_window = ControlsWindow()         

  def keyPressEvent(self, e):
    if e.key() == QtCore.Qt.Key_Return:
      self.toggleControlsWindow()

  def toggleControlsWindow(self):
    if self.isFullScreen():
      self.showNormal()
      self.controls_window = ControlsWindow()      
    else:
      self.controls_window.close()           
      self.showFullScreen()

  def play(self):
    self.mediaPlayer.play()


def main():
  app = QtGui.QApplication(sys.argv)
  player_window = PlayerWindow()

  sys.exit(app.exec_())               


if __name__ == "__main__":
  main()

Answer 1

您可以将 PlayerWindow 的实例传递给 ControlsWindow 的类构造函数:

class ControlsWindow(QtGui.QWidget):

  def __init__(self, parent):  # Notice the new parent argument
    super(ControlsWindow, self).__init__()
    self.parent = parent

    self.playPauseButton = QtGui.QPushButton('Play', self)
    self.show()

    # Now you can call the parent's (PlayerWindow) play() function:
    self.parent.play()


class PlayerWindow(QtGui.QWidget):

  def __init__(self):
    super(PlayerWindow, self).__init__()

    # ...
    self.mediaPlayer = self.playerInstance.media_player_new() 
    # ... 
    self.initUI()
    self.play()

  def initUI(self):
    # ...
    self.show()
    self.controls_window = ControlsWindow(self)  # Pass a reference of PlayerWindow

  def keyPressEvent(self, e):
    if e.key() == QtCore.Qt.Key_Return:
      self.toggleControlsWindow()

  def toggleControlsWindow(self):
    if self.isFullScreen():
      self.showNormal()
      self.controls_window = ControlsWindow(self)  # Pass a reference of PlayerWindow
    else:
      self.controls_window.close()           
      self.showFullScreen()

  def play(self):
    self.mediaPlayer.play()


def main():
  app = QtGui.QApplication(sys.argv)
  player_window = PlayerWindow()

  sys.exit(app.exec_())               


if __name__ == "__main__":
    main()

希望这有帮助!