python之pyqt之QGraphicsScene 的上下文菜单

我有一个 QGraphicsScene，我将显示一个上下文菜单。但是什么也没发生。

这是我的代码:

class graphicsScene(QtGui.QGraphicsScene): 
  def __init__ (self, parent = None): 
    super(graphicsScene, self).__init__ (parent) 
 
  def contextMenuEvent(self, event): 
    self.popMenu = QtGui.QMenu() 
    self.popMenu.addAction(QtGui.QAction('test0', None)) 
    self.popMenu.addAction(QtGui.QAction('test1', None)) 
    self.popMenu.addSeparator() 
    self.popMenu.addAction(QtGui.QAction('test2', None)) 
    self.popMenu.exec_(event.globalPos()) 
 
  def mousePressEvent(self, event): 
    super(graphicsScene, self).mousePressEvent(event) 
    pos = event.scenePos() 
    item = self.itemAt(pos) 
 
    if event.button() == QtCore.Qt.LeftButton: 
      #do something 
 
    elif event.button() == QtCore.Qt.RightButton: 
      self.contextMenuEvent(event) 

我不知道如何解决这个问题。

谢谢你的帮助!!!

请您参考如下方法:

这可能有帮助:

class Table(QtGui.QGraphicsView): 
  def __init__(self, parent=None): 
    super(Table, self).__init__(parent) 
    self.setScene(QtGui.QGraphicsScene()) 
    self.setContextMenuPolicy(QtCore.Qt.DefaultContextMenu) 
 
  def contextMenuEvent(self, event): 
    menu = QtGui.QMenu() 
    menu.addAction('sample') 
    menu.exec_(event.globalPos())