Although the visibility flag for a layer might be set to
TRUE it won't be rendered as on of its ancestor group layer is set
to be invisible. The
TRUE if the
layer and all its ancestor layers have their visibility flag set to true
and the layer is actually rendered.
widget path or layer object of class
layer id. If the widget argument is of class
TRUE if the layer and all its ancestor layers have their
visibility flag set to true and the layer is actually rendered, otherwise
Visibile layers are rendered, invisible ones are not. If any
ancestor of a layer is set to be invisible then the layer is not rendered
either. The layer visibility flag can be checked with
l_layer_isVisible and the actual visibility (i.e. are all the
ancesters visibile too) can be checked with
Note that layer visibility is not a state of the layer itself, instead is information that is part of the layer collection (i.e. its parent widget).