scrolling popup menu

I don't unbderstand exactly what you meen by "As a result, if I have many MenuItem the popup menu gets cut so the user can't see all the JMenuItem" but you can do the following :

Instead of adding/removing directly from the popup menu, you should keepthe content of it in a separate class, and recreate the popup with the desired content every time.

Supose you have a class PopupContentManager, like this :

public class PopupContentManager {
  private Vector popupItems;
  ......................
  public void addItem(JMenuItem item) {
    popupItems.addElement(item);
  }
  public void removeItem(JMenuItem item) {
    popupItems.removeElement(item);
  }

  public void showPopup(int x, int y) {
    JPopupMenu popup = new JPopupMenu();
    for(int i= 0; i<popupItems.size(); i++)
      popup.add((JMenuItem) popupItems.elementAt(i));
    popup.show(x, y)
  }
}

My problem is with the display of the menu when I have many items in it (and not with the fact that it is a dynamic menu – I know how to add/remove menuItems to/from the popup). When I have many JmenuItem in the menu so that the height of the menu is bigger then the screen, the user can't see some of the JMenuItems.
What I need is a way to put the menu in a scroll pane.

thanks, Shushan

One solution is to put the menu like they do in a Java source editor for autocompletion, using JWindow. Instead of showing directly the popup you should show a JWindow containing a scrollPane with the desired popup. You must take care at this solution about the state of the JWindow, e.g. if was hidded by the application window you should destroy'it.

Another solution with graphical effect is to implement something like windows 2000 or 98 menus. You can create a special JMenuItem containing a down arrow/up arrow, which if pressed should hide/show the contents of the popup from the index 0 to his current index. To not destroy the JMenuItems you can create special menuItems which have the hidden state (or directly using their setVisible(true/false) method).

For the "arrow menu item" you can set the text to "\/" or "/\" to simulate the arrow, or write a custom JMenuItemUI class in which you actually draw a arrow. This class should have a refference tor the menu from which is part of.

thanks, i'll try it.

me too and good luck.

thanks, i'll try it.

thanks, i'll try it.