@Override
		public void keyPressed(KeyEvent e) {
			if (e.isConsumed()) {
				return;
			}
			if (e.getKeyCode() == KeyEvent.VK_ENTER) {
				if (isCompletionListVisible()) {
					activateCurrentCompletion();
					e.consume();
				}
			}
			else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
				if (isCompletionListVisible()) {
					selectNext();
					e.consume();
				}
			}
			else if (e.getKeyCode() == KeyEvent.VK_UP) {
				if (isCompletionListVisible()) {
					selectPrev();
					e.consume();
				}
			}
			else if (e.getKeyCode() == KeyEvent.VK_PAGE_DOWN) {
				if (isCompletionListVisible()) {
					selectNextPage();
					e.consume();
				}
			}
			else if (e.getKeyCode() == KeyEvent.VK_PAGE_UP) {
				if (isCompletionListVisible()) {
					selectPrevPage();
					e.consume();
				}
			}
			else if (e.getKeyCode() == KeyEvent.VK_END) {
				if (isCompletionListVisible()) {
					selectLast();
					e.consume();
				}
			}
			else if (e.getKeyCode() == KeyEvent.VK_HOME) {
				if (isCompletionListVisible()) {
					selectFirst();
					e.consume();
				}
			}
			else if (e.getKeyCode() == KeyEvent.VK_SPACE &&
				(e.getModifiersEx() & InputEvent.CTRL_DOWN_MASK) != 0) {
				startCompletion((JTextField) e.getComponent());
				e.consume();
			}
			else if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
				if (isCompletionListVisible()) {
					setCompletionListVisible(false);
					e.consume();
				}
			}
		}
A listener to handle all the callbacks
Ghidra/Framework/Docking/src/main/java/docking/widgets/autocomplete/TextFieldAutocompleter.java