Event when selecting an object

[Anonymous]

Hello everyone,
I'm trying to catch an event when selecting an object. The gif below I found in an addons that when selecting an object the palette has changed. How can I do that?
Thank you very much in advance.

[Viktor Kovacs · Accepted solution]

Check out this function:
https://archicadapi.graphisoft.com/documentation/acapi_notify_catchselectionchange

[Anonymous]

Thank you. Viktor Kovacs