@Override
	public void actionPerformed(ActionEvent e) {

		// First things first - turn off the tail state. If the user interacts with the view 
		// controls, tailing is deactivated.
		FVEvent tailOffEvt = new FVEvent(EventType.SCROLL_LOCK_ON, null);
		eventListener.send(tailOffEvt);

		// Now move the viewport up the distance of the viewport.
		FVEvent moveUpEvt = new FVEvent(EventType.VIEWPORT_PAGE_UP, false);
		eventListener.send(moveUpEvt);
	}
Handles the actions required when the user presses the page up key.
Ghidra/Framework/Project/src/main/java/ghidra/framework/main/logviewer/event/PageUpAction.java