ActionContext getActionContext(MouseEvent event) {
		if (event != null && placementComponent == event.getSource()) {
			Point p = event.getPoint();
			return new BitFieldEditorContext(getDataTypeComponent(p),
				placementComponent.getBitOffset(p));
		}
		return null;
	}
@return true if actively adding a bitfield
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/compositeeditor/BitFieldEditorPanel.java