Add a layers panel

[brichet]

Add a layer panel to the left.

Remaining for this PR:

• [x] Add button to toggle visible
• [x] Add icons for the layer type
• [x] Add tests

Probably in a follow up PR:

• display the maps in the layer tree order (and not the layers list order)

[github-actions[bot]]

:point_left: Launch a Binder on branch brichet/jupytergis/layers

[brichet]

My comments are only nitpicky comments about the naming of layersTree. It seems a bit heterogeneous in the code-base between layersTree, layerTree and treeLayers so I'm suggesting going for layersTree everywhere.

Your are right for some of them, but maybe not for all. I wanted to make the distinction between the tree itself (a IJGISLayerGroup object, what I called layerTree), and the list of layers coming from the tree (a (IJGISLayerGroup | string)[] object, that I called treeLayers).

The second come from the fact that I used a IJGISLayerGroup for the tree but we only need the list of layers, the other properties are useless. See https://github.com/QuantStack/jupytergis/issues/4#issuecomment-2182530646 for reference.

Maybe we should declare the tree as a (IJGISLayerGroup | string)[] to simplify. The only drawback is the duplication of the following schema, for the layersTree itself and the layers of a IJGISLayerGroup.

"items": {
  "oneOf": [
      {"type": "string"},
      {
        "type": "object",
        "$ref": "#/definitions/jGISLayerGroup"
      }
  ]
}

It would clarify the naming and the tree object, avoiding useless properties, since the tree should only be a list of layers and groups (if I'm not mistaken).

[martinRenou]

Oh ok I see.

Maybe we should declare the tree as a (IJGISLayerGroup | string)[] to simplify

That sounds good to me. Then you only operate on this layersTree (the root) which is of this type.

[brichet]

Oh ok I see.

Maybe we should declare the tree as a (IJGISLayerGroup | string)[] to simplify

That sounds good to me. Then you only operate on this layersTree (the root) which is of this type.

Exact, let's update it then.

[brichet]

@martinRenou I updated the schema