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<TITLE>Listening to All Key Events Before Delivery to Focused Component (Java Developers Almanac Example)
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  <h3>e636. Listening to All Key Events Before Delivery to Focused Component</h3>

Registering a key event dispatcher with the keyboard focus manager
allows you to see all key events before they are sent to the
focused component. It is possible to modify the event
or even prevent the event from being delivered.


<pre>    KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(
        new KeyEventDispatcher() {
            public boolean dispatchKeyEvent(KeyEvent e) {
                // This example converts all typed keys to upper case
                if (e.getID() == KeyEvent.KEY_TYPED) {
                    e.setKeyChar(Character.toUpperCase(e.getKeyChar()));
                }
    
                // If the key should not be dispatched to the
                // focused component, set discardEvent to true
                boolean discardEvent = false;
                return discardEvent;
            }
        });
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