Java3d applet中的JPopupMenu不接收鼠标或键盘输入

Question

I have aa Java application that uses Java3D and JPopupMenus filled with JMenuItems. Everything works fine when it runs as a regular application-- the JPopupMenus and everything else behave as expected. However, when I make an applet out of the application, the JPopupMenu that pops up entirely over the Canvas3D does not act as expected. The JPopupMenu behaves as follows:

1. The menu items do not highlight as the mouse moves over them
2. The arrow keys cannot be used to move through the menu items
3. Clicking on a top-level JMenuItem completes the action and highlights the item, but it does not dispose of the JPopupMenu as it does in the regular application
4. Clicking on a top-level JMenuItem that contatins a submenu does nothing
5. Clicking outside of the JPopupMenu does not dispose of the JPopupMenu as it does in the regular application
6. With the JPopupMenu displayed, opening a JPopupMenu on top of the swing portion of my program enables regular and expected behavior of the JPopupMenu over the Canvas3D, but point 5 still applies

Some more information:

• The JPopupMenu is displayed with JPopupMenu.show() in relation to the JPanel holding the Canvas3D
• I am calling JPopupMenu.setDefaultLightWeightPopupEnabled(false) before the creation of any JPopupMenus, but this line doesn't seem to make a difference.
• I thought that this might have been a focus issue, but JPopupMenu.requestFocusInWindow() doesn't work

So my question is: what is causing the behavior to be different between the application and the applet, and how can I make the JPopupMenu in the applet function as it does in the application?

Answer 1

您必须将轻量级JPopup更改为重量级，而不必发布其他内容而不发布您的SSCCE

Answer 2

I solved by setting the invoker on the JPopMenu and make it HeavyWeight

final JPopupMenu popup = new JPopupMenu();
popup.setLightWeightPopupEnabled(false);
popup.setInvoker(myJFrame);