void addListeners() {
		addFieldLocationListener(this);
		addFieldSelectionListener(this);
		addLiveFieldSelectionListener(liveSelectionListener);
		addFieldInputListener(this);
		addFieldMouseListener(this);
	}
FieldInputListener method called to process key pressed event.
Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/ByteViewerComponent.java