Finer-grained library API

[klayoutmatthias]

We would need the following API extensions for Library:

lib.name = new_lib_def.lib_name   # not in API

or

lib.rename(new_lib_def.lib_name)   # not in API

and

lib.unregister()

[martinjankoehler]

• Reloading libraries Reloading cell libraries does not work #2168
• Rename libraries
• Removing libraries

[klayoutmatthias]

Added Library#unregister, Library#rename and fixed the behavior of "_destroy" (will unregister the library). Also, unregistration now properly removes the library from the library manager view and library cell references become "defunct" as expected (i.e. they can be restored when a new library with the right name is registered).

As the topic is closely related to #2168 and touches the same parts of the code, the fix is included in the branch for that issue.

[martinjankoehler]

Great!

Once performing Library.rename, currently the cells of open layouts are not reflecting the rename.
I thought Cell.library=, but this is readonly.
How could this be best achieved?

[klayoutmatthias]

Hmm ... there is a function to remap a cell to a different library/library cell index, but it is probably easier to make the rename change the library references as well.

[klayoutmatthias]

I just changed the behavior of "rename" to also change the references instead of invalidating them. I guess that's easier to use.

[klayoutmatthias]

Now there is also Cell#change_ref in case you need it. It will change a cell's library reference to a new library and cell. It needs a cell that is a reference already and cannot convert a static cell to a library reference. Those are two different things in KLayout.

[martinjankoehler]

@klayoutmatthias I can confirm it works, but the cell tree widgets display state is not yet refreshed.

(i.e. after renaming mylib→mylib2 the tree still shows mylib.rect, but if I click on the cell it get's renamed propertly).

Not sure if that should be part of the feature.
Otherwise, how can I refresh the Cell Tree view programatically?