Trapping the addition of ScrollBar on ScrollPane.

Hi All,
I have a Panel in which there is a JScrollPane(with JTextArea) and a button. On the click of button we add the components dynamically to the Panel. Now since the size of the Panel(inside a frame) will remain the same therefore adding components at run time will add ScrollBar to the ScrollPane(as it is reduced in size).
So what i have to do is to trap the moment at which the scrollbar comes into picture. That is when i keep on adding some components dynamically at run time so at some time the scrollbar will be added to scrollPane. All i have to do is display a message at the moment when the ScrollBar is visible.
I am stuck with this for almost a day....... Please help soon

What you can do (it's pretty ugly and I haven't tested it) is this :
- subclass JScrollPane
- override the createVerticalScrollBar() and createHorizontalScrollBar()
- in both overriden methods return a subclass of JScrollPane.ScrollBar instance in which you will have overriden the setVisible(boolean aFlag) method.
- in the setVisible method, you may test the value of the flag.

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Trapping the addition of ScrollBar on ScrollPane.

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