add
open override fun addPersistentStyleLayer(properties: Value, layerPosition: LayerPosition?): Expected<String, None>
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Adds a new style layer.
Whenever a new style is being parsed and currently used style has persistent layers, an engine will try to do following:
keep the persistent layer at its relative position
keep the source used by a persistent layer
keep images added through
addStyleImagemethod
In cases when a new style has the same layer, source or image resource, style's resources would be used instead and MapLoadingError event will be emitted.
Return
A string describing an error if the operation was not successful, or empty otherwise.
Parameters
layerPosition
If not empty, the new layer will be positioned according to layer position parameters.
properties
A map of style layer properties.