How is eclipse line number status line contribution item implemented?

Question

I need to update status line editor-specific information. I already have my own implementation, but I would like to take a look how is eclipse contribution item, which shows

Answer 1

In order to find out how something is implemented in Eclipse, you can also use the so called Plug-in spy. The Plug-in spy is included in the Plug-in Development Environmend (PDE). It is executed with ALT+SHIFT+F1. For further details look this Plug-in development FAQ.