Add layers feature to support visiblity

Ben Lehmann

Add a layers feature to support controlling visibility of annotations.

I want to use mind maps to present structured content to colleagues. I want information about the maps to also be added, but I want it to be more immediately accessible/browsable than the 'add notes to this node' feature currently. Therefore, I like to add explanatory notes to my mind maps using floating topics rather than the the node-notes feature. These floating topic notes then have arrows pointing to the nodes they add information to.

But it would be great to be allow viewers to have the visibility of these notes turned on/off. Even better if the layer's visibility could be bound to the 'IsExpanded' state of a particular node — so that a particular layer turned on/off along with the bound node(s) expanded/collapsed state.

Ultimately, it would be great to have a feature where I could create a mind map with annotations that I could direct colleagues to. They would then be able to take themselves on a 'self-guided' tour through the mind map, with different annotations appearing/disappearing as they focused on different nodes.