Enabling/Disabling Cut/Copy/Paste buttons

Here's today's "Tear My Hair Out" problem.
I'm working on a data manipulation application, where we will be providing the standard cut/copy/paste functionality. We want to disable the menu items and toolbar buttons if there's nothing selected. I know this is possible, since both JDeveloper and NetBeans do it, but I'm at a loss for a clean way to do it.
The only thing I can come up with is to add key, mouse, and focus listeners to each text component and check the selection whenever an appropriate event happens which could affect it. Obviously a lot of overhead.
Anyone know a simpler way to do this?
Thanks.

Check out the Clipboard class, and the getSystemClipboard() method in Toolkit (I think).
If you were to store your data on the system clipboard, like most applications, then you can have a single thread which monitors the state of the clipboard and updates the state of the paste button as and when is appropriate.
Alternatively, use your own clipboard. Just so long as there is ONE resource which stores all the cut/copy data, and changes the state of the paste button accordingly.
For the cut/copy actions, you will probably have only one method which carries this out, so have this method update the state of the cut/copy buttons.
This really is very simple. If it's getting too complicated, you're doing it wrong. Hope this helps.

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