Run some code when a popup closes in my swing app

问题

In my app I display a popup using JPopupMenu. I want to run some code when this popup closes (either directly, programmatically or when escape key is pressed). For windows I can attach a WindowListener but JPopupMenu doesn't have any corresponding feature, and SwingUtilities.windowForComponent returns the root window of the app. How do I implement this?

回答1:

How about adding a PopupMenuListener to it? Something like:

jpopMenu.addPopupMenuListener(new PopupMenuListener 
{
  public void popupMenuCanceled(PopupMenuEvent popupMenuEvent) 
  {
    //here the code you want to be executed at close
  }
  public void popupMenuWillBecomeInvisible(PopupMenuEvent popupMenuEvent){}
  public void popupMenuWillBecomeVisible(PopupMenuEvent popupMenuEvent) {}
}

This should be automatically executed when you cancel/close the popMenu. I didn't add code to the other two methods, but feel free to play with them if needed.

来源：https://stackoverflow.com/questions/62765704/run-some-code-when-a-popup-closes-in-my-swing-app