[Marble-devel] How does LayerInterface ask for an update?

[Kishore Jonnalagadda]

I am porintg some old code that user the customPaint method to instead use 
LayerInterface. The one part that i am stuck with is how does LayerInterface 
inform the widget that its needs update?

Previously, with customPaint() as the whole paint and data to be information 
to be painted was within the widget, i could simply call update() on the 
widget. Now that i have modularized the code, and layers are separated from 
the widget (they have no pointer to it) i was wondering how this is to be 
achieved?

Am i misusing the API? I do not want to create a marble plugin and install it 
into the marble install directories for it to work properly. Is there a 
solution?
--
Cheers!
Kishore