Manages layers that hold user-derived data such as drawings or local files. Each type of user data layer is
grouped under a theme layer in the layer tree.
This manager provides functionality for adding, organizing, and toggling visibility of user data layers
in the layer tree.
Manages layers that hold user-derived data such as drawings or local files. Each type of user data layer is grouped under a theme layer in the layer tree. This manager provides functionality for adding, organizing, and toggling visibility of user data layers in the layer tree.