private boolean hasEnabledHoverServices() {
		for (HoverService hoverService : hoverServices) {
			if (hoverService.hoverModeSelected()) {
				return true;
			}
		}
		return false;
	}
Sets the object that decides where to place the popup window. 
@param popupWindowPlacer the placer
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/hover/AbstractHoverProvider.java