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Internalframes getting focus

Posted on 1998-08-27
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Last Modified: 2011-09-20
Hi there,

I'm using swing, and have a desktop pane with 4 internal frames. What I want to do is to detect when one of the
window gets the focus. I tried adding focuslisteners to
each of the internal frames, but it doesn't seem to be
detecting it. Also, the title bar doesn't seem to detect
any mouse events. Any ideas? Thanks in advanced.
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Question by:zyca
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Expert Comment

by:satishb
ID: 1222762

Hi Mr. Zyca,

You can try using an InternalFrameListener for this purpose. The method InternalFrameActivated(InternalFrameEvent e) will catch such events. Then you can go through the InternalFrame in a desktop and can find  wich frame it is.

All the best
Satish.
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Author Comment

by:zyca
ID: 1222763
I need some actual code on how this can be done
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Accepted Solution

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satishb earned 100 total points
ID: 1222764

Hi zyca,

Here is the code which i am using for such purpose and it is perfectly working. Ofcourse i am providing just the skeleton.


THis is in your InternalFrame class.

public class InternalFrameWindow extends JInternalFrame {

    /** The Desktop object */
    private Desktop theDesktop;
   
    public InternalFrameWindow (Desktop parent,......) {

    ..................

    this.addInternalFrameListener(new InternalFrameAdapter() {
            public void internalFrameActivated (InternalFrameEvent e) {
                theDesktop.setActiveWindow(InternalFrameWindow.this);
            }
    });
  .................
  .............
  }

Then where ever you want to find our the internal frame that got activated you need to go through the internal frames in that desktop and find out which one has the focus.

           JInternalFrame[] openFrames = desktop.getAllFrames();

            for(int x = 0; x < openFrames.length; x++)
            {
             
                if (openFrames[x] instanceof   whateveryourinternalframeclassis )
                {
                      if (openFrames[x].isSelected()) {
                          do something
                      }
                }
            }

I hope this works for you. Let me know if you need any more information.

good luck
satish.
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