Popup menu for a QGraphicsItem?

[Morea]

What is the difference between contextMenuEvent and handling mousepressEvent and checking if the rightbutton was clicked?

[jpn]

From QContextMenuEvent docs:

Context menu events are sent to widgets when a user performs an action associated with opening a context menu. The actions required to open context menus vary between platforms; for example, on Windows, pressing the menu button or clicking the right mouse button will cause this event to be sent.