feature: getLayer / getLayers

[cvietor]

Is your feature request related to a problem? Please describe.
Currently, the ui-mapbox plugin does not allow to get (and interact) with map style layers.
A use case would be to show or hide certain layers like "hide motorways", "show bikelanes"

Describe the solution you'd like
I propose to introduce the concept of a "Layer" type as following:

interface Layer {
  id: string;
  visibility(): boolean;
  show(): void;
  hide(): void;
}

The native SDKs for Android and iOS provide more properties, but additional properties can be added later when needed (i.e. getMaxZoom, getMinZoom, etc). For now, imho that basic structure should be good enough for now.

To be able to get a single layer or a list of all map style layers, the MapboxViewApi needs to be extended with the following methods:

getLayer(name: string, nativeMap?): Promise<Layer>;

getLayers(nativeMap?: any): Promise<Array<Layer>>;

Additional context
I would be happy to provide a PR that adds this functionality

[farfromrefug]

@cvietor great idea! waiting for your PR ;)

[felixkrautschuk]

@cvietor @farfromrefug maxZoom and minZoom have already been implemented in my PR here in the original nativescript-mapbox plugin. But unfortunately the plugin author never merged it for whatever reason :(

[farfromrefug]

@felixkrautschuk any chance for you to create the PR again on this repo ? I will merge it!

[felixkrautschuk]

@farfromrefug not immediatly, but maybe at the weekend

[cvietor]

@felixkrautschuk actually, the getMinZoom and getMaxZoom methods i mentioned are layer dependent and your's are the min- and max zoom levels of the map... so they a different things.
anyway, PR is welcomed :-)

[felixkrautschuk]

@cvietor ahhhh sorry :D
but yeah, i will recreate that PR anyway as soon as i get time