Listening to All Key Events Before Delivery to Focused Component
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.
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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