Flickerring Problem With JPopUpMenu

Question

Hello Friends,
In my application made in Java i show a JPopUpmenu on a JINternalFrame in a DekstopPane which is further kept in JFrame. The contents of the PopUpMenu may vary as according to the various places where the mouse is clicked. Sometimes when the mouse may be clicked on the lower part of the applciation some part of the PopUpmenu goes out of the visible area of the screen. For that after showing the popupmenu i get the height of the popup menu and shift it accordingly so that its length doesnt go out of the viewable area. It works fine but the problem is that it gives a little flicker. And alsoo of i try to set the position before showing the pop up menu i am not able to do so because before calling the show() method of the popUPmenu i am getting the height and width of the pop up menu. Please help me out.
Any type of pointers and links would be highly helpful.
Thanks in Advance
Vikram.

Answer 1

HI!
it didnt work
here is the code snippet
          popupClass.pack();
          popupClass.requestFocus();          
          java.lang.System.out.println(" HEIGHTTTTT "+popupClass.getHeight());
          int Height = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight();
          int Width = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight();
          if ((DiagramInternalPane)getParent() != null)
               if(((mouseY+popupClass.getHeight()-((DiagramInternalPane)getParent()).GetParent().scrollpane.getVerticalScrollBar().getValue()+AsterixApplet.getFrame().getY()) > Height-160) && ((mouseX+popupClass.getWidth()-((DiagramInternalPane)getParent()).GetParent().scrollpane.getHorizontalScrollBar().getValue()+AsterixApplet.getFrame().getX()) > Width-20))
                    popupClass.show(comp,mouseX-popupClass.getWidth(), mouseY-popupClass.getHeight());
               else
                    if((mouseY+popupClass.getHeight()-((DiagramInternalPane)getParent()).GetParent().scrollpane.getVerticalScrollBar().getValue()+AsterixApplet.getFrame().getY()) > Height-160)
                         popupClass.show(comp,mouseX, mouseY-popupClass.getHeight());
                    if((mouseX+popupClass.getWidth()-((DiagramInternalPane)getParent()).GetParent().scrollpane.getHorizontalScrollBar().getValue()+AsterixApplet.getFrame().getX()) > Width-20)
                         popupClass.show(comp,mouseX-popupClass.getWidth(), mouseY);     
          if(getParent() != null)     
               getParent().repaint();
          popupClass.show(comp,mouseX, mouseY);                
          java.lang.System.out.println(" HEIGHTTTTT AAAAAAAAAAAAAAAA"+popupClass.getHeight());
Before caluing the show() , method i am getting the height as 0 and only after calling the show method i am getting the actual height. Is it a java bug or something ?
Anyway thanks for all ur help