public void setPopupPlacer(PopupWindowPlacer popupWindowPlacer) {
		this.popupWindowPlacer =
			popupWindowPlacer == null ? DEFAULT_WINDOW_PLACER : popupWindowPlacer;
	}
Sets the object that decides where to place the popup window. 
@param popupWindowPlacer the placer
Ghidra/Framework/Docking/src/main/java/docking/widgets/PopupWindow.java