@Override
		public void actionPerformed(NavigatableActionContext context) {
			isForward = !isForward;
			getToolBarData().setIcon(isForward ? FORWARD_ICON : BACKWARD_ICON);
			updateActionsDirection(isForward);
		}
The NextPrevCodeUnitPlugin generates a GoTo event based on where the cursor
is located in the program. The GoTo events provided by this plugin are:
<UL>
<LI>Next-Previous Instruction</LI>
<LI>Next-Previous Defined Data</LI>
<LI>Next-Previous Undefined Data</LI>
<LI>Next-Previous Function</LI>
<LI>Next-Previous Non-Function</LI>
<LI>Next-Previous Label</LI>
<LI>Next-Previous Bookmark</LI>
</UL>
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/navigation/NextPrevCodeUnitPlugin.java